phoenix_cli/

scaffold.rs

use std::{
    collections::{BTreeMap, BTreeSet},
    env, fs,
    io::ErrorKind,
    path::{Component, Path, PathBuf},
    process::Command,
    str::FromStr,
    time::{SystemTime, UNIX_EPOCH},
};

use thiserror::Error;

const MODULES_START: &str = "// <phoenix:modules>";
const MODULES_END: &str = "// </phoenix:modules>";
const MODELS_START: &str = "// <phoenix:model-registry>";
const MODELS_END: &str = "// </phoenix:model-registry>";
const MIGRATIONS_START: &str = "// <phoenix:migration-registry>";
const MIGRATIONS_END: &str = "// </phoenix:migration-registry>";
const COMMANDS_START: &str = "// <phoenix:commands>";
const COMMANDS_END: &str = "// </phoenix:commands>";
const PROJECT_OPTIONS_FILE: &str = ".phoenix";

#[derive(Clone, Debug, Eq, PartialEq)]
pub enum DependencySource {
    Registry,
    Local(PathBuf),
}

/// Initial React rendering mode selected by `px new`.
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
pub enum ProjectRenderMode {
    Spa,
    Ssr,
    #[default]
    Islands,
}

impl ProjectRenderMode {
    #[must_use]
    pub const fn page_builder(self) -> &'static str {
        match self {
            Self::Spa => ".spa()",
            Self::Ssr => ".ssr()",
            Self::Islands => ".islands()",
        }
    }
}

impl FromStr for ProjectRenderMode {
    type Err = String;

    fn from_str(value: &str) -> Result<Self, Self::Err> {
        match value.trim().to_ascii_lowercase().as_str() {
            "spa" => Ok(Self::Spa),
            "ssr" => Ok(Self::Ssr),
            "islands" | "island" => Ok(Self::Islands),
            _ => Err("render mode must be spa, ssr, or islands".to_owned()),
        }
    }
}

/// One optional database driver selected when a project is created.
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
pub enum ProjectDatabase {
    Sqlite,
    Pgsql,
    Mysql,
    All,
}

/// Source format used for generated React components.
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
pub enum ProjectFrontend {
    Jsx,
    #[default]
    Tsx,
}

impl ProjectFrontend {
    #[must_use]
    pub const fn extension(self) -> &'static str {
        match self {
            Self::Jsx => "jsx",
            Self::Tsx => "tsx",
        }
    }
}

impl FromStr for ProjectFrontend {
    type Err = String;

    fn from_str(value: &str) -> Result<Self, Self::Err> {
        match value.trim().to_ascii_lowercase().as_str() {
            "jsx" | "js" => Ok(Self::Jsx),
            "tsx" | "ts" => Ok(Self::Tsx),
            _ => Err("frontend must be jsx or tsx".to_owned()),
        }
    }
}

impl ProjectDatabase {
    #[must_use]
    pub const fn cargo_feature(self) -> &'static str {
        match self {
            Self::Sqlite => "sqlite",
            Self::Pgsql => "pgsql",
            Self::Mysql => "mysql",
            Self::All => "all-databases",
        }
    }

    #[must_use]
    pub const fn toasty_features(self) -> &'static str {
        match self {
            Self::Sqlite => "serde\", \"sqlite",
            Self::Pgsql => "postgresql\", \"serde",
            Self::Mysql => "mysql\", \"serde",
            Self::All => "mysql\", \"postgresql\", \"serde\", \"sqlite",
        }
    }
}

impl FromStr for ProjectDatabase {
    type Err = String;

    fn from_str(value: &str) -> Result<Self, Self::Err> {
        match value.trim().to_ascii_lowercase().as_str() {
            "sqlite" => Ok(Self::Sqlite),
            "pgsql" | "postgres" | "postgresql" => Ok(Self::Pgsql),
            "mysql" | "mariadb" => Ok(Self::Mysql),
            "all" => Ok(Self::All),
            _ => Err("database must be sqlite, pgsql, mysql, or all".to_owned()),
        }
    }
}

impl DependencySource {
    #[must_use]
    pub fn discover() -> Self {
        if let Some(path) = env::var_os("PHOENIX_FRAMEWORK_PATH") {
            let path = PathBuf::from(path);
            if is_framework_root(&path) {
                return Self::Local(path);
            }
        }
        let Ok(executable) = env::current_exe() else {
            return Self::Registry;
        };
        for ancestor in executable.ancestors() {
            if is_framework_root(ancestor) {
                return Self::Local(ancestor.to_path_buf());
            }
        }
        let build_root = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
            .join("../..")
            .canonicalize()
            .unwrap_or_else(|_| PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("../.."));
        if is_framework_root(&build_root) {
            return Self::Local(build_root);
        }
        Self::Registry
    }
}

fn is_framework_root(path: &Path) -> bool {
    path.join("crates/phoenix/Cargo.toml").is_file()
        && path.join("packages/phoenix-react/package.json").is_file()
        && path.join("packages/phoenix-vite/package.json").is_file()
}

#[derive(Clone, Debug)]
pub struct NewProjectOptions {
    pub target: PathBuf,
    pub dependencies: DependencySource,
    pub initialize_git: bool,
    pub install_dependencies: bool,
    pub render_mode: ProjectRenderMode,
    pub database: Option<ProjectDatabase>,
    pub frontend: ProjectFrontend,
    pub tailwind: bool,
}

impl NewProjectOptions {
    #[must_use]
    pub fn new(target: impl Into<PathBuf>) -> Self {
        Self {
            target: target.into(),
            dependencies: DependencySource::discover(),
            initialize_git: false,
            install_dependencies: true,
            render_mode: ProjectRenderMode::default(),
            database: None,
            frontend: ProjectFrontend::default(),
            tailwind: false,
        }
    }

    #[must_use]
    pub fn dependencies(mut self, dependencies: DependencySource) -> Self {
        self.dependencies = dependencies;
        self
    }

    #[must_use]
    pub const fn initialize_git(mut self, initialize: bool) -> Self {
        self.initialize_git = initialize;
        self
    }

    #[must_use]
    pub const fn install_dependencies(mut self, install: bool) -> Self {
        self.install_dependencies = install;
        self
    }

    #[must_use]
    pub const fn render_mode(mut self, render_mode: ProjectRenderMode) -> Self {
        self.render_mode = render_mode;
        self
    }

    #[must_use]
    pub const fn database(mut self, database: Option<ProjectDatabase>) -> Self {
        self.database = database;
        self
    }

    #[must_use]
    pub const fn frontend(mut self, frontend: ProjectFrontend) -> Self {
        self.frontend = frontend;
        self
    }

    #[must_use]
    pub const fn tailwind(mut self, tailwind: bool) -> Self {
        self.tailwind = tailwind;
        self
    }
}

#[derive(Clone, Copy, Debug, Default)]
pub struct GenerateOptions {
    pub force: bool,
}

#[derive(Clone, Copy, Debug, Default)]
pub struct ControllerOptions {
    pub force: bool,
    pub resource: bool,
    pub route: bool,
}

#[derive(Clone, Copy, Debug, Default)]
#[allow(clippy::struct_excessive_bools)]
pub struct ModelOptions {
    pub all: bool,
    pub api_resource: bool,
    pub controller: bool,
    pub force: bool,
    pub migration: bool,
    pub page: bool,
    pub request: bool,
    pub resource_controller: bool,
}

#[derive(Debug, Error)]
pub enum ScaffoldError {
    #[error("invalid Phoenix name `{0}`; use letters, numbers, dashes, underscores, / or ::")]
    InvalidName(String),
    #[error("project target {0} already exists and is not empty")]
    ProjectNotEmpty(PathBuf),
    #[error("{0} is not a Phoenix project root")]
    NotProject(PathBuf),
    #[error("refusing to overwrite existing file {0}; pass --force to replace it")]
    AlreadyExists(PathBuf),
    #[error("Phoenix managed markers are missing or malformed in {0}")]
    InvalidManagedFile(PathBuf),
    #[error("local Phoenix framework root is invalid: {0}")]
    InvalidFrameworkRoot(PathBuf),
    #[error("failed to read or write {path}: {source}")]
    Io {
        path: PathBuf,
        source: std::io::Error,
    },
    #[error("{program} exited unsuccessfully while preparing the project")]
    CommandFailed { program: &'static str },
    #[error("the current time is before the Unix epoch")]
    InvalidClock,
}

/// Create a complete Phoenix application that can immediately run `px dev`.
///
/// # Errors
///
/// Returns an error for invalid names, non-empty targets, invalid local framework
/// paths, file-system failures, or dependency/bootstrap command failures.
pub fn create_project(options: &NewProjectOptions) -> Result<(), ScaffoldError> {
    let target = absolute_path(&options.target)?;
    ensure_empty_target(&target)?;
    let directory_name = target
        .file_name()
        .and_then(|value| value.to_str())
        .ok_or_else(|| ScaffoldError::InvalidName(target.display().to_string()))?;
    let package = package_name(directory_name)?;
    if let DependencySource::Local(root) = &options.dependencies
        && !is_framework_root(root)
    {
        return Err(ScaffoldError::InvalidFrameworkRoot(root.clone()));
    }

    let mut editor = ProjectEditor::new(&target, false);
    for (path, content) in project_files(&package, options)? {
        editor.create(path, content)?;
    }
    editor.commit()?;

    if options.initialize_git {
        run_optional("git", &["init", "--quiet"], &target)?;
    }
    if options.install_dependencies {
        run_required("npm", &["install"], &target)?;
        run_required("npm", &["run", "types", "--silent"], &target)?;
    }
    Ok(())
}

#[derive(Clone, Debug)]
pub struct ProjectGenerator {
    root: PathBuf,
}

impl ProjectGenerator {
    /// Locate the Phoenix project containing `start`.
    ///
    /// # Errors
    ///
    /// Returns an error when no parent contains the expected Phoenix layout.
    pub fn discover(start: impl AsRef<Path>) -> Result<Self, ScaffoldError> {
        let start = absolute_path(start.as_ref())?;
        for candidate in start.ancestors() {
            if is_project_root(candidate) {
                return Ok(Self {
                    root: candidate.to_path_buf(),
                });
            }
        }
        Err(ScaffoldError::NotProject(start))
    }

    #[must_use]
    pub fn root(&self) -> &Path {
        &self.root
    }

    /// Refresh generated TypeScript contracts after a Rust generator runs.
    ///
    /// Returns `Ok(false)` before JavaScript dependencies are installed; Vite
    /// will still generate the files when development starts.
    ///
    /// # Errors
    ///
    /// Returns an error when the installed Phoenix Vite generator fails.
    pub fn refresh_types(&self) -> Result<bool, ScaffoldError> {
        if !self.root.join("node_modules/@apizero/vite").is_dir() {
            return Ok(false);
        }
        run_required("npm", &["run", "types", "--silent"], &self.root)?;
        Ok(true)
    }

    /// Generate a controller and optionally its conventional resource route.
    ///
    /// # Errors
    ///
    /// Returns an error for invalid names, conflicts, or malformed managed files.
    pub fn controller(
        &self,
        name: &str,
        options: ControllerOptions,
    ) -> Result<Vec<PathBuf>, ScaffoldError> {
        let name = QualifiedName::parse_with_suffix(name, "Controller")?;
        let mut editor = ProjectEditor::new(&self.root, options.force);
        add_rust_item(
            &mut editor,
            "app/controllers",
            &name,
            &controller_template(&name.class, options.resource),
        )?;
        if options.route || options.resource {
            add_controller_route(&mut editor, &name, options.resource, None)?;
        }
        editor.commit()
    }

    /// Generate a Toasty model and any requested companion artifacts.
    ///
    /// `--all` creates the currently supported cohesive business slice: model,
    /// migration, request, API resource, resource controller/route, and index page.
    ///
    /// # Errors
    ///
    /// Returns an error for invalid names, conflicts, or malformed managed files.
    pub fn model(
        &self,
        name: &str,
        mut options: ModelOptions,
    ) -> Result<Vec<PathBuf>, ScaffoldError> {
        if options.all {
            options.migration = true;
            options.request = true;
            options.api_resource = true;
            options.controller = true;
            options.resource_controller = true;
            options.page = true;
        }
        let model = QualifiedName::parse(name)?;
        let request = model.with_leaf(format!("Store{}Request", model.class));
        let resource = model.with_leaf(format!("{}Resource", model.class));
        let controller = model.with_leaf(format!("{}Controller", model.class));
        let page = model.index_page_name();
        let props = page_props_name(&page);
        let cohesive = options.request
            && options.api_resource
            && options.controller
            && options.resource_controller
            && options.page;
        let mut editor = ProjectEditor::new(&self.root, options.force);
        add_model(&mut editor, &model)?;
        if options.migration {
            add_model_migration(&mut editor, &model)?;
        }
        if options.request {
            add_rust_item(
                &mut editor,
                "app/requests",
                &request,
                &request_template(&request.class),
            )?;
        }
        if options.api_resource {
            add_rust_item(
                &mut editor,
                "app/resources",
                &resource,
                &resource_template(&resource.class),
            )?;
        }
        if options.controller || options.resource_controller {
            let content = if cohesive {
                model_controller_template(&controller, &request, &resource, &props, &page.route)
            } else {
                controller_template(&controller.class, options.resource_controller)
            };
            add_rust_item(&mut editor, "app/controllers", &controller, &content)?;
            let action = cohesive.then_some((&request, &resource));
            add_controller_route(
                &mut editor,
                &controller,
                options.resource_controller,
                action,
            )?;
        }
        if options.page {
            add_page(&mut editor, &page, self.frontend())?;
        }
        editor.commit()
    }

    /// Generate one migration and register it in `database/migrations/mod.rs`.
    ///
    /// # Errors
    ///
    /// Returns an error for invalid names, conflicts, time, or managed files.
    pub fn migration(
        &self,
        name: &str,
        options: GenerateOptions,
    ) -> Result<Vec<PathBuf>, ScaffoldError> {
        let migration_name = snake_identifier(name)?;
        let mut editor = ProjectEditor::new(&self.root, options.force);
        add_migration(
            &mut editor,
            &migration_name,
            inferred_table(&migration_name),
        )?;
        editor.commit()
    }

    /// Generate a validated request DTO and update its Rust module.
    ///
    /// # Errors
    ///
    /// Returns an error for invalid names, conflicts, or malformed managed files.
    pub fn request(
        &self,
        name: &str,
        options: GenerateOptions,
    ) -> Result<Vec<PathBuf>, ScaffoldError> {
        self.rust_contract(name, "Request", "app/requests", request_template, options)
    }

    /// Generate a browser-safe API resource and update its Rust module.
    ///
    /// # Errors
    ///
    /// Returns an error for invalid names, conflicts, or malformed managed files.
    pub fn resource(
        &self,
        name: &str,
        options: GenerateOptions,
    ) -> Result<Vec<PathBuf>, ScaffoldError> {
        self.rust_contract(
            name,
            "Resource",
            "app/resources",
            resource_template,
            options,
        )
    }

    /// Generate a pass-through middleware ready for application logic.
    ///
    /// # Errors
    ///
    /// Returns an error for invalid names, conflicts, or malformed managed files.
    pub fn middleware(
        &self,
        name: &str,
        options: GenerateOptions,
    ) -> Result<Vec<PathBuf>, ScaffoldError> {
        let name = QualifiedName::parse_with_suffix(name, "Middleware")?;
        let mut editor = ProjectEditor::new(&self.root, options.force);
        add_rust_item(
            &mut editor,
            "app/middleware",
            &name,
            &middleware_template(&name.class),
        )?;
        editor.commit()
    }

    /// Generate a React page plus its Rust Page Props contract.
    ///
    /// # Errors
    ///
    /// Returns an error for invalid names, conflicts, or malformed managed files.
    pub fn page(
        &self,
        name: &str,
        options: GenerateOptions,
    ) -> Result<Vec<PathBuf>, ScaffoldError> {
        let page = PageName::parse(name)?;
        let mut editor = ProjectEditor::new(&self.root, options.force);
        add_page(&mut editor, &page, self.frontend())?;
        editor.commit()
    }

    /// Generate a React Island component.
    ///
    /// # Errors
    ///
    /// Returns an error for invalid names, conflicts, or file-system failures.
    pub fn island(
        &self,
        name: &str,
        options: GenerateOptions,
    ) -> Result<Vec<PathBuf>, ScaffoldError> {
        let name = QualifiedName::parse(name)?;
        let mut editor = ProjectEditor::new(&self.root, options.force);
        let mut path = PathBuf::from("views/islands");
        path.extend(name.modules.iter().map(|module| kebab_case(module)));
        let frontend = self.frontend();
        path.push(format!(
            "{}.{}",
            kebab_case(&name.class),
            frontend.extension()
        ));
        editor.create(path, island_template(&name.class, frontend))?;
        editor.commit()
    }

    /// Generate a console command and register it in `app/commands/mod.rs`.
    ///
    /// # Errors
    ///
    /// Returns an error for invalid names, conflicts, or malformed managed files.
    pub fn command(
        &self,
        name: &str,
        options: GenerateOptions,
    ) -> Result<Vec<PathBuf>, ScaffoldError> {
        let name = QualifiedName::parse(name)?;
        let mut editor = ProjectEditor::new(&self.root, options.force);
        add_command(&mut editor, &name)?;
        editor.commit()
    }

    fn rust_contract(
        &self,
        name: &str,
        suffix: &str,
        directory: &str,
        template: fn(&str) -> String,
        options: GenerateOptions,
    ) -> Result<Vec<PathBuf>, ScaffoldError> {
        let name = QualifiedName::parse_with_suffix(name, suffix)?;
        let mut editor = ProjectEditor::new(&self.root, options.force);
        add_rust_item(&mut editor, directory, &name, &template(&name.class))?;
        editor.commit()
    }

    fn frontend(&self) -> ProjectFrontend {
        fs::read_to_string(self.root.join(PROJECT_OPTIONS_FILE))
            .ok()
            .and_then(|source| {
                source
                    .lines()
                    .find_map(|line| line.strip_prefix("frontend=").map(str::to_owned))
            })
            .and_then(|value| value.parse().ok())
            .unwrap_or_default()
    }
}

fn is_project_root(path: &Path) -> bool {
    path.join("Cargo.toml").is_file()
        && path.join("package.json").is_file()
        && path.join("app").is_dir()
        && path.join("routes").is_dir()
        && path.join("views").is_dir()
}

fn project_files(
    package: &str,
    options: &NewProjectOptions,
) -> Result<Vec<(PathBuf, String)>, ScaffoldError> {
    let (rust_dependency, react, react_ssr, vite) = match &options.dependencies {
        DependencySource::Registry => (
            "phoenix = { package = \"phoenixrs\", version = \"0.1.3\", default-features = false }"
                .to_owned(),
            "https://registry.npmjs.org/@apizero/react/-/react-0.1.2.tgz".to_owned(),
            "https://registry.npmjs.org/@apizero/react-ssr/-/react-ssr-0.1.2.tgz".to_owned(),
            "https://registry.npmjs.org/@apizero/vite/-/vite-0.1.3.tgz".to_owned(),
        ),
        DependencySource::Local(root) => {
            let root = absolute_path(root)?;
            (
                format!(
                    "phoenix = {{ package = \"phoenixrs\", path = {}, default-features = false }}",
                    json_string(&root.join("crates/phoenix").to_string_lossy())
                ),
                format!("file:{}", root.join("packages/phoenix-react").display()),
                format!("file:{}", root.join("packages/phoenix-react-ssr").display()),
                format!("file:{}", root.join("packages/phoenix-vite").display()),
            )
        }
    };
    let crate_name = package.replace('-', "_");
    let tailwind = if options.tailwind {
        ",\n    \"@tailwindcss/vite\": \"^4.3.0\",\n    \"tailwindcss\": \"^4.3.0\""
    } else {
        ""
    };
    let package_json = format!(
        r#"{{
  "name": {package},
  "version": "0.1.0",
  "private": true,
  "type": "module",
  "scripts": {{
    "dev": "vite --host 127.0.0.1",
    "build": "npm run build:client && npm run build:ssr",
    "build:client": "vite build",
    "build:ssr": "vite build --config vite.ssr.config.ts",
    "types": "node -e \"import('@apizero/vite').then(({{ generateRouteTypes }}) => generateRouteTypes('routes', 'views/generated/routes.ts', '.', 'views/generated/contracts.ts'))\"",
    "typecheck": "npm run types && tsc --noEmit"
  }},
  "dependencies": {{
    "@apizero/react": {react},
    "@apizero/react-ssr": {react_ssr},
    "@apizero/vite": {vite},
    "react": "^19.1.0",
    "react-dom": "^19.1.0"
  }},
  "devDependencies": {{
    "@types/react": "^19.0.0",
    "@types/react-dom": "^19.0.0",
    "typescript": "^5.8.0",
    "vite": "^7.3.6"{tailwind}
  }}
}}
"#,
        package = json_string(package),
        react = json_string(&react),
        react_ssr = json_string(&react_ssr),
        vite = json_string(&vite),
        tailwind = tailwind,
    );
    let (database_features, toasty_dependency) = options.database.map_or_else(
        || ("default = []\ndatabase = []\n".to_owned(), String::new()),
        |database| {
            let app_feature = database.cargo_feature();
            let phoenix_features = match database {
                ProjectDatabase::All => "\"database\", \"phoenix/sqlite\", \"phoenix/pgsql\", \"phoenix/mysql\"".to_owned(),
                _ => format!("\"database\", \"phoenix/{app_feature}\""),
            };
            let toasty_features = database.toasty_features();
            (
                format!(
                    "default = [\"{app_feature}\"]\ndatabase = [\"phoenix/database\"]\n{app_feature} = [{phoenix_features}]\n"
                ),
                format!(
                    "toasty = {{ version = \"0.8\", default-features = false, features = [\"migration\", \"{toasty_features}\"] }}\n"
                ),
            )
        },
    );
    let cargo_toml = format!(
        "[package]\nname = {package}\nversion = \"0.1.0\"\nedition = \"2024\"\nrust-version = \"1.95\"\npublish = false\ndefault-run = {package}\n\n[features]\n# Database support is omitted unless selected during `px new`.\n{database_features}tls = [\"phoenix/tls\"]\nwebsocket = [\"phoenix/websocket\"]\nsse = [\"phoenix/sse\"]\nauth = [\"phoenix/auth\"]\njwt = [\"phoenix/jwt\"]\npassword = [\"phoenix/password\"]\nmetrics = [\"phoenix/metrics\"]\nredis = [\"phoenix/redis\"]\nstorage = [\"phoenix/storage\"]\nqueue = [\"phoenix/queue\"]\nmail = [\"phoenix/mail\"]\ntesting = [\"phoenix/testing\"]\n\n[dependencies]\n{rust_dependency}\nserde = {{ version = \"1\", features = [\"derive\"] }}\nserde_json = \"1\"\n{toasty_dependency}tokio = {{ version = \"1\", features = [\"macros\", \"rt-multi-thread\", \"signal\"] }}\n\n[profile.release]\ncodegen-units = 1\nlto = true\nopt-level = \"z\"\npanic = \"unwind\"\nstrip = \"symbols\"\n\n[workspace]\n",
        package = json_string(package),
        database_features = database_features,
        rust_dependency = rust_dependency,
        toasty_dependency = toasty_dependency,
    );

    let mut files = vec![
        ("Cargo.toml".into(), cargo_toml),
        (
            PROJECT_OPTIONS_FILE.into(),
            format!("frontend={}\n", options.frontend.extension()),
        ),
        ("package.json".into(), package_json),
        (".gitignore".into(), "/target\n/node_modules\n/public/assets\n/public/ssr\n/views/generated/*.ts\n/dist\n/storage/*.sqlite\n/storage/*.sqlite-*\n.env\n.DS_Store\n".to_owned()),
        (".env.example".into(), env_example_template(options.database.is_some())),
        ("README.md".into(), project_readme(package, options)),
        ("src/main.rs".into(), main_template(&crate_name)),
        ("src/lib.rs".into(), lib_template(options.database.is_some())),
        ("config/mod.rs".into(), config_template(options.database.is_some())),
        ("config/app.toml".into(), app_toml_template(package)),
        ("config/schemas/phoenix-config-app.schema.json".into(), include_str!("../schemas/phoenix-config-app.schema.json").to_owned()),
        ("taplo.toml".into(), app_taplo_template(options.database.is_some())),
        ("deploy/restart.sh.example".into(), deploy_restart_example()),
        ("app/controllers/mod.rs".into(), managed_modules(&["pub mod home_controller;", "pub use home_controller::HomeController;"])),
        ("app/controllers/home_controller.rs".into(), home_controller_template(options.render_mode)),
        ("app/props/mod.rs".into(), managed_modules(&["pub mod home_props;", "pub use home_props::HomeProps;"])),
        ("app/props/home_props.rs".into(), home_props_template()),
        ("app/requests/mod.rs".into(), managed_modules(&[])),
        ("app/resources/mod.rs".into(), managed_modules(&[])),
        ("app/middleware/mod.rs".into(), managed_modules(&[])),
        ("app/commands/mod.rs".into(), commands_mod_template()),
        ("routes/web.rs".into(), home_route_template()),
        (
            format!("views/pages/home.{}", options.frontend.extension()).into(),
            home_page_template(options.frontend),
        ),
        ("views/styles.css".into(), styles_template(options.tailwind)),
        ("views/generated/contracts.ts".into(), generated_contracts_template()),
        ("views/generated/routes.ts".into(), generated_routes_template()),
        ("vite.config.ts".into(), vite_template(false, options.tailwind)),
        ("vite.ssr.config.ts".into(), vite_template(true, options.tailwind)),
        ("tsconfig.json".into(), tsconfig_template()),
        ("public/.gitkeep".into(), String::new()),
        ("storage/cache/.gitkeep".into(), String::new()),
        ("storage/logs/.gitkeep".into(), String::new()),
        ("views/components/.gitkeep".into(), String::new()),
        ("views/islands/.gitkeep".into(), String::new()),
        ("views/layouts/.gitkeep".into(), String::new()),
    ];
    if options.database.is_some() {
        files.extend([
            (
                "config/database.toml".into(),
                database_toml_template(options.database.expect("database selected")),
            ),
            (
                "config/schemas/phoenix-config-database.schema.json".into(),
                include_str!("../schemas/phoenix-config-database.schema.json").to_owned(),
            ),
            ("app/models/mod.rs".into(), empty_model_registry()),
            (
                "database/migrations/mod.rs".into(),
                empty_migration_registry(),
            ),
            ("database/seeders/mod.rs".into(), seeder_template()),
            (
                "src/bin/phoenix-manage.rs".into(),
                management_template(&crate_name),
            ),
        ]);
    }
    Ok(files)
}

fn env_example_template(database: bool) -> String {
    let database = if database {
        "\n# Database overrides for the driver selected during `px new`.\n# DB_PASSWORD=secret\n# DATABASE_URL=...\n"
    } else {
        ""
    };
    format!(
        "# Copy to `.env` for local secrets and overrides.\n# Precedence: config/*.toml < .env < process environment.\n\nAPP_ENV=development\nAPP_ADDR=127.0.0.1:3000\nAPP_URL=http://127.0.0.1:3000\n{database}\nTRUSTED_PROXIES=none\nALLOWED_HOSTS=127.0.0.1,localhost,[::1]\nRATE_LIMIT_REQUESTS=60\nRATE_LIMIT_WINDOW_SECONDS=60\nVITE_DEV_URL=http://127.0.0.1:5173\nPHOENIX_LOG=info,hyper=warn\n"
    )
}

fn app_toml_template(package: &str) -> String {
    format!(
        r#"# Application settings (Laravel-style config/app).
# Secrets and machine-specific overrides belong in `.env`.
# Editor autocomplete: Even Better TOML / Taplo + #:schema below.

#:schema ./schemas/phoenix-config-app.schema.json

name = {package}
env = "development"
addr = "127.0.0.1:3000"
url = "http://127.0.0.1:3000"
"#,
        package = json_string(package),
    )
}

fn database_toml_template(database: ProjectDatabase) -> String {
    format!(
        r#"# Database connections (Laravel-style config/database).
#
# Switch engines by changing `default`:
#   default = "sqlite"   # local file, zero setup
#   default = "pgsql"    # PostgreSQL
#   default = "mysql"    # MySQL / MariaDB
# Enable the matching Cargo feature only when this application uses a database.
#
# Or set DB_CONNECTION=pgsql|mysql in `.env` without editing this file.
# Put DB_PASSWORD in `.env` — do not commit production passwords here.
# Editor autocomplete: Even Better TOML / Taplo + #:schema below.

#:schema ./schemas/phoenix-config-database.schema.json

default = "{default}"

[connections.sqlite]
driver = "sqlite"
# Path is relative to the application root (creates parent dirs as needed by the OS/driver).
database = "storage/app.sqlite"

[connections.pgsql]
driver = "pgsql"
host = "127.0.0.1"
port = 5432
database = "phoenix"
username = "phoenix"
password = ""

[connections.mysql]
driver = "mysql"
host = "127.0.0.1"
port = 3306
database = "phoenix"
username = "phoenix"
password = ""
"#,
        default = if database == ProjectDatabase::All {
            "sqlite"
        } else {
            database.cargo_feature()
        },
    )
}

fn app_taplo_template(database: bool) -> String {
    let database_rule = if database {
        "\n[[rule]]\ninclude = [\"config/database.toml\"]\n[rule.schema]\npath = \"./config/schemas/phoenix-config-database.schema.json\"\n"
    } else {
        ""
    };
    format!(
        "# Taplo / Even Better TOML schema associations for config/*.toml autocomplete.\n\n[[rule]]\ninclude = [\"config/app.toml\"]\n[rule.schema]\npath = \"./config/schemas/phoenix-config-app.schema.json\"\n{database_rule}"
    )
}

fn deploy_restart_example() -> String {
    r"#!/bin/sh
# Copy to deploy/restart.sh and make executable.
# Used by `px release:install` / `px release:rollback` when --restart-cmd is omitted.
set -eu
systemctl restart my-app
"
    .to_owned()
}

fn config_template(database: bool) -> String {
    let database = if database {
        " + `config/database.toml`"
    } else {
        ""
    };
    format!(
        "pub use phoenix::config::{{AppConfig, AppConfigBuilder, ConfigError, Environment, SecretValue}};\n\n/// Load this application's configuration.\n///\n/// Reads `config/app.toml`{database}, then `.env`, then process environment.\n///\n/// # Errors\n///\n/// Returns a source, validation, or production-requirement error.\npub fn load() -> Result<AppConfig, ConfigError> {{\n    AppConfig::load()\n}}\n"
    )
}

fn management_template(crate_name: &str) -> String {
    r#"#[cfg(feature = "database")]
use std::{env, error::Error, io};

#[cfg(feature = "database")]
use phoenix::database::MigrationRunner;

#[cfg(feature = "database")]
type CommandResult<T = ()> = Result<T, Box<dyn Error>>;

#[cfg(not(feature = "database"))]
fn main() {
    println!("Database support is disabled; enable the sqlite, pgsql, or mysql feature.");
}

#[cfg(feature = "database")]
#[tokio::main]
async fn main() -> CommandResult {
    let arguments = env::args().skip(1).collect::<Vec<_>>();
    let command = arguments
        .first()
        .map(String::as_str)
        .ok_or_else(|| input_error("expected migrate, status, rollback, fresh, or seed"))?;
    let options = &arguments[1..];
    if !matches!(command, "migrate" | "status" | "rollback" | "fresh" | "seed") {
        return Err(input_error(format!("unknown management command `{command}`")).into());
    }

    let config = __PHOENIX_APP_CRATE__::config::load()?;
    let mut database = __PHOENIX_APP_CRATE__::database(&config).await?;
    if command == "seed" {
        require_no_options(options)?;
        __PHOENIX_APP_CRATE__::seeders::run(&mut database).await?;
        println!("Seeders completed.");
        return Ok(());
    }

    let mut runner = MigrationRunner::new(
        &mut database,
        __PHOENIX_APP_CRATE__::migrations::all(),
    )?;
    match command {
        "migrate" => {
            require_no_options(options)?;
            let applied = runner.up().await?;
            println!("Applied {applied} migration(s).");
        }
        "status" => {
            require_no_options(options)?;
            let plan = runner.plan().await?;
            if plan.applied.is_empty() && plan.pending.is_empty() {
                println!("No migrations registered or applied.");
            }
            for migration in plan.applied {
                println!(
                    "APPLIED  {}  batch={}  {}  {}",
                    migration.id, migration.batch, migration.applied_at, migration.name
                );
            }
            for id in plan.pending {
                println!("PENDING  {id}");
            }
        }
        "rollback" => {
            let steps = parse_rollback_steps(options)?;
            let rolled_back = runner.down(steps).await?;
            println!("Rolled back {rolled_back} migration(s).");
        }
        "fresh" => {
            let run_seeders = parse_fresh_options(options)?;
            let applied = runner.plan().await?.applied.len();
            let rolled_back = runner.down(applied).await?;
            let migrated = runner.up().await?;
            println!(
                "Rebuilt the database: rolled back {rolled_back}, applied {migrated} migration(s)."
            );
            drop(runner);
            if run_seeders {
                __PHOENIX_APP_CRATE__::seeders::run(&mut database).await?;
                println!("Seeders completed.");
            }
        }
        "seed" => unreachable!("seed is handled before creating the migration runner"),
        _ => unreachable!("management commands are validated before connecting"),
    }
    Ok(())
}

#[cfg(feature = "database")]
fn require_no_options(options: &[String]) -> CommandResult {
    if options.is_empty() {
        Ok(())
    } else {
        Err(input_error(format!("unexpected arguments: {}", options.join(" "))).into())
    }
}

#[cfg(feature = "database")]
fn parse_rollback_steps(options: &[String]) -> CommandResult<usize> {
    let [steps] = options else {
        return Err(input_error("rollback expects one positive step count").into());
    };
    steps
        .parse::<usize>()
        .ok()
        .filter(|steps| *steps > 0)
        .ok_or_else(|| input_error("rollback step count must be a positive integer").into())
}

#[cfg(feature = "database")]
fn parse_fresh_options(options: &[String]) -> CommandResult<bool> {
    match options {
        [] => Ok(false),
        [option] if option == "--seed" => Ok(true),
        _ => Err(input_error("fresh only accepts --seed").into()),
    }
}

#[cfg(feature = "database")]
fn input_error(message: impl Into<String>) -> io::Error {
    io::Error::new(io::ErrorKind::InvalidInput, message.into())
}
"#
    .replace("__PHOENIX_APP_CRATE__", crate_name)
}

fn seeder_template() -> String {
    r"use std::error::Error;

use phoenix::database::Database;

/// Insert repeatable development or test data.
///
/// # Errors
///
/// Returns the first application or database error raised by a seeder.
pub async fn run(_database: &mut Database) -> Result<(), Box<dyn Error>> {
    Ok(())
}
"
    .to_owned()
}

fn empty_model_registry() -> String {
    format!(
        "{MODULES_START}\n{MODULES_END}\n\n{MODELS_START}\n{}\n{MODELS_END}\n",
        render_model_registry(&BTreeSet::new()).join("\n")
    )
}

fn empty_migration_registry() -> String {
    format!(
        "{MIGRATIONS_START}\n{}\n{MIGRATIONS_END}\n",
        render_migration_registry(&BTreeSet::new()).join("\n")
    )
}

fn project_readme(package: &str, options: &NewProjectOptions) -> String {
    let mode = match options.render_mode {
        ProjectRenderMode::Spa => "SPA",
        ProjectRenderMode::Ssr => "SSR",
        ProjectRenderMode::Islands => "Islands",
    };
    let database = options.database.map_or_else(
        || "This project has no database dependency. Create one with `px new --database sqlite|pgsql|mysql`.".to_owned(),
        |database| format!("Selected driver: `{}`. Use `px migrate` and `px status` for migrations.", database.cargo_feature()),
    );
    let tailwind = if options.tailwind {
        "Tailwind CSS v4 is enabled through `@tailwindcss/vite`."
    } else {
        "Tailwind CSS is not enabled; add it at creation time with `px new --tailwind`."
    };
    format!(
        "# {package}\n\nPhoenix Rust + React application.\n\n## Start\n\n```bash\ncp .env.example .env\npx dev\n```\n\n`px dev` builds the browser and renderer bundles before it starts the app, then rebuilds them whenever Rust or React source changes. The development document therefore uses the same Vite assets and renderer contract as `npm run build`.\n\n## Rendering mode\n\nThis application starts in **{mode}** mode. Change only the page chain in `app/controllers/home_controller.rs`:\n\n```rust\n.spa()       // SPA\n.ssr()       // SSR\n.islands()   // Islands\n```\n\nThe controller, routes, renderer and build pipeline stay unchanged.\n\n## Optional integrations\n\n- {database}\n- {tailwind}\n\n## Release\n\n```bash\npx release --version 0.1.0 --tarball\n```\n"
    )
}

fn main_template(crate_name: &str) -> String {
    format!(
        r#"use phoenix::prelude::{{CommandResult, Console, LogFormat, Logging}};

use {crate_name}::commands;

#[tokio::main]
async fn main() -> CommandResult {{
    Console::new(env!("CARGO_PKG_NAME"))
        .about("Phoenix application")
        .serve(|_ctx| async move {{
            let config = {crate_name}::config::load()?;
            let address = config.address().to_owned();
            let public_url = config.public_url().to_owned();
            let production = config.environment().is_production();
            let _logging = Logging::new()
                .format(if production {{ LogFormat::Json }} else {{ LogFormat::Compact }})
                .ansi(!production)
                .init()?;
            let server = {crate_name}::application(config).await?.bind(&address).await?;
            println!(
                "Phoenix application ready at {{public_url}} (listening on {{}})",
                server.local_addr()
            );
            server
                .run_with_shutdown(async {{
                    let _ = tokio::signal::ctrl_c().await;
                }})
                .await?;
            Ok(())
        }})
        .commands(commands::registry())
        .run()
        .await
}}
"#
    )
}

fn lib_template(_database: bool) -> String {
    r#"#[path = "../config/mod.rs"]
pub mod config;
#[path = "../app/commands/mod.rs"]
pub mod commands;
#[path = "../app/controllers/mod.rs"]
pub mod controllers;
#[path = "../app/middleware/mod.rs"]
pub mod middleware;
#[cfg(feature = "database")]
#[path = "../app/models/mod.rs"]
pub mod models;
#[path = "../app/props/mod.rs"]
pub mod props;
#[path = "../app/requests/mod.rs"]
pub mod requests;
#[path = "../app/resources/mod.rs"]
pub mod resources;
#[cfg(feature = "database")]
#[path = "../database/migrations/mod.rs"]
pub mod migrations;
#[cfg(feature = "database")]
#[path = "../database/seeders/mod.rs"]
pub mod seeders;

use phoenix::prelude::{
    AccessLog, Application, AssetManifest, Csrf, HostAllowlist, NodeRenderer,
    NonceSecurityPolicy, RateLimit, RateLimitConfig, RendererConfig, RendererManifest, RequestId, Routes, ServeProductionAssets, SessionConfig, SessionMiddleware,
    SessionStore, StateMiddleware, TrustedProxies,
};
#[cfg(feature = "database")]
use phoenix::prelude::{Database, DatabaseError};

use config::AppConfig;

#[must_use]
#[allow(clippy::duplicate_mod)]
pub fn routes(
    config: &AppConfig,
    assets: Option<&AssetManifest>,
    renderer: &NodeRenderer,
) -> Routes {
    let session_config = SessionConfig {
        secure: config.public_url().starts_with("https://"),
        ..SessionConfig::default()
    };
    let session_store = SessionStore::memory(session_config.max_age);

    let mut routes = phoenix::mount_routes!()
        .with_middleware(TrustedProxies::new(config.trusted_proxies().iter().copied()))
        .with_middleware(RequestId)
        .with_middleware(AccessLog);
    if let Some(assets) = assets.cloned() {
        // Serve hashed Vite assets before session/CSRF so static GETs stay cheap.
        routes = routes.with_middleware(ServeProductionAssets::new(assets, "public/assets"));
    }
    routes
        .with_middleware(HostAllowlist::new(config.allowed_hosts().iter().cloned()))
        .with_middleware(RateLimit::new(RateLimitConfig {
            requests: config.rate_limit_requests(),
            window: config.rate_limit_window(),
        }))
        .with_middleware(content_security_policy(config))
        .with_middleware(SessionMiddleware::new(session_store, session_config))
        .with_middleware(Csrf)
        .with_middleware(StateMiddleware::new(config.clone()))
        .with_middleware(StateMiddleware::new(assets.cloned()))
        .with_middleware(StateMiddleware::new(renderer.clone()))
}

fn content_security_policy(config: &AppConfig) -> NonceSecurityPolicy {
    if !config.environment().is_production() {
        return NonceSecurityPolicy::development(
            config
                .vite_dev_url()
                .expect("development configuration always has a Vite origin"),
        )
        .expect("AppConfig validates VITE_DEV_URL as one trusted HTTP(S) origin");
    }
    NonceSecurityPolicy::default()
}

/// Build the Phoenix application.
///
/// # Errors
///
/// Returns a route error when route names or patterns conflict.
pub async fn application(
    config: AppConfig,
) -> Result<Application, Box<dyn std::error::Error + Send + Sync>> {
    let assets = AssetManifest::load("public/assets/phoenix-manifest.json")?;
    let renderer_manifest = RendererManifest::load("public/ssr/phoenix-renderer.json")?;
    let renderer = NodeRenderer::new(
        RendererConfig::production(&assets, &renderer_manifest, "public/ssr")?,
    );
    renderer.warm_up().await?;
    Ok(Application::new(routes(&config, Some(&assets), &renderer))?)
}

/// Connect the configured database with every registered Toasty model.
///
/// # Errors
///
/// Returns a database error when the URL or connection is invalid.
#[cfg(feature = "database")]
pub async fn database(config: &AppConfig) -> Result<Database, DatabaseError> {
    Database::builder(models::all())
        .connect(config.database_url())
        .await
}
"#
    .to_owned()
}

fn commands_mod_template() -> String {
    format!(
        "use phoenix::prelude::commands;\n\n{MODULES_START}\n{MODULES_END}\n\ncommands! {{\n{COMMANDS_START}\n{COMMANDS_END}\n}}\n"
    )
}

fn command_template(function_name: &str) -> String {
    format!(
        r#"use phoenix::prelude::{{CommandContext, CommandResult}};

/// Application console command.
#[allow(clippy::unused_async)]
pub async fn {function_name}(_ctx: CommandContext<'_>) -> CommandResult {{
    println!("{function_name} ran.");
    Ok(())
}}
"#
    )
}

fn home_controller_template(render_mode: ProjectRenderMode) -> String {
    format!(
        r#"use phoenix::prelude::{{AssetManifest, NodeRenderer, Page, Request, Response, StatusCode}};

use crate::props::HomeProps;

pub struct HomeController;

impl HomeController {{
    pub async fn index(request: Request) -> Response {{
        let renderer = request.extensions().get::<NodeRenderer>().cloned();
        let assets = request
            .extensions()
            .get::<Option<AssetManifest>>()
            .and_then(Option::as_ref);
        let mut page = Page::new(
            "home",
            HomeProps {{
                title: "Phoenix is ready".to_owned(),
                description: "Rust owns the application contract; React renders the page.".to_owned(),
            }},
        )
        {render_mode};
        if let Some(assets) = assets {{
            page = match page.production_assets(assets, "client") {{
                Ok(page) => page,
                Err(error) => {{
                    return Response::text(format!("asset manifest error: {{error}}"))
                        .with_status(StatusCode::INTERNAL_SERVER_ERROR);
                }}
            }};
        }}
        match renderer {{
            Some(renderer) => page.respond_with_renderer(&request, &renderer).await,
            None => Response::text("Phoenix renderer is unavailable")
                .with_status(StatusCode::INTERNAL_SERVER_ERROR),
        }}
    }}
}}
"#,
        render_mode = render_mode.page_builder(),
    )
}

fn home_props_template() -> String {
    r#"use serde::Serialize;

#[phoenix::contract(page, page = "home")]
#[derive(Serialize)]
pub struct HomeProps {
    pub title: String,
    pub description: String,
}
"#
    .to_owned()
}

fn home_route_template() -> String {
    r#"use phoenix::prelude::Routes;

use crate::controllers::HomeController;

#[must_use]
pub fn routes() -> Routes {
    Routes::new()
        .get("/", HomeController::index)
        .name("home")
}
"#
    .to_owned()
}

fn home_page_template(frontend: ProjectFrontend) -> String {
    match frontend {
        ProjectFrontend::Tsx => r#"import type { HomeProps } from "../generated/contracts.js";

export default function Home({ title, description }: HomeProps) {
  return (
    <main className="welcome">
      <p className="eyebrow">PHOENIX / RUST + REACT</p>
      <h1>{title}</h1>
      <p>{description}</p>
      <code>px make:model Post --all</code>
    </main>
  );
}
"#
        .to_owned(),
        ProjectFrontend::Jsx => r#"export default function Home({ title, description }) {
  return (
    <main className="welcome">
      <p className="eyebrow">PHOENIX / RUST + REACT</p>
      <h1>{title}</h1>
      <p>{description}</p>
      <code>px make:model Post --all</code>
    </main>
  );
}
"#
        .to_owned(),
    }
}

fn styles_template(tailwind: bool) -> String {
    let tailwind = if tailwind {
        "@import \"tailwindcss\";\n\n"
    } else {
        ""
    };
    format!(
        r#"{tailwind}:root {{
  font-family: Inter, ui-sans-serif, system-ui, sans-serif;
  color: #172033;
  background: #f5f7fb;
}}
* {{ box-sizing: border-box; }}
body {{ margin: 0; min-width: 320px; min-height: 100vh; }}
.welcome {{ width: min(760px, calc(100% - 40px)); margin: 16vh auto 0; }}
.eyebrow {{ color: #315bd6; font-size: 12px; font-weight: 800; letter-spacing: 0.14em; }}
h1 {{ margin: 12px 0; font-size: clamp(42px, 8vw, 76px); line-height: 0.98; }}
.welcome > p:not(.eyebrow) {{ max-width: 640px; color: #5d6879; font-size: 18px; line-height: 1.7; }}
code {{ display: inline-block; margin-top: 18px; padding: 12px 14px; border: 1px solid #d7dce5; background: white; }}
"#
    )
}

fn generated_contracts_template() -> String {
    r#"// Generated by Phoenix. Vite will refresh this file from Rust contracts.
export interface HomeProps {
  title: string;
  description: string;
}
export interface PhoenixPageProps { home: HomeProps }
export type PhoenixSharedProps = Record<string, never>;
export const contractHash = "scaffold" as const;
"#
    .to_owned()
}

fn generated_routes_template() -> String {
    r#"// Generated by Phoenix. Vite will refresh this file from Rust routes.
export const routes = { home: "home" } as const;
export type PhoenixRouteName = "home";
export const home = routes.home;
"#
    .to_owned()
}

fn vite_template(renderer: bool, tailwind: bool) -> String {
    let tailwind_import = if tailwind {
        "import tailwindcss from \"@tailwindcss/vite\";\n"
    } else {
        ""
    };
    let tailwind_plugin = if tailwind { ", tailwindcss()" } else { "" };
    format!(
        "import {{ defineConfig }} from \"vite\";\nimport {{ phoenix }} from \"@apizero/vite\";\n{tailwind_import}\nexport default defineConfig({{\n  plugins: [phoenix({renderer}){tailwind_plugin}],\n}});\n",
        renderer = if renderer { "{ renderer: true }" } else { "" },
    )
}

fn tsconfig_template() -> String {
    r#"{
  "compilerOptions": {
    "target": "ES2022",
    "lib": ["ES2022", "DOM", "DOM.Iterable"],
    "module": "ESNext",
    "moduleResolution": "Bundler",
    "jsx": "react-jsx",
    "strict": true,
    "noEmit": true,
    "preserveSymlinks": true,
    "skipLibCheck": true,
    "types": ["vite/client"]
  },
  "include": ["views/**/*.js", "views/**/*.jsx", "views/**/*.ts", "views/**/*.tsx", "vite.config.ts", "vite.ssr.config.ts"]
}
"#
    .to_owned()
}

fn managed_modules(entries: &[&str]) -> String {
    let body = entries.join("\n");
    if body.is_empty() {
        format!("{MODULES_START}\n{MODULES_END}\n")
    } else {
        format!("{MODULES_START}\n{body}\n{MODULES_END}\n")
    }
}

fn add_rust_item(
    editor: &mut ProjectEditor,
    base: &str,
    name: &QualifiedName,
    content: &str,
) -> Result<(), ScaffoldError> {
    let mut directory = PathBuf::from(base);
    let mut parent_module = directory.join("mod.rs");
    for namespace in &name.modules {
        let module = snake_case(namespace);
        editor.update_managed_lines(
            &parent_module,
            MODULES_START,
            MODULES_END,
            &[format!("pub mod {module};")],
        )?;
        directory.push(&module);
        parent_module = directory.join("mod.rs");
    }
    let module = snake_case(&name.class);
    editor.create(directory.join(format!("{module}.rs")), content.to_owned())?;
    editor.update_managed_lines(
        &parent_module,
        MODULES_START,
        MODULES_END,
        &[
            format!("pub mod {module};"),
            format!("pub use {module}::{};", name.class),
        ],
    )?;
    Ok(())
}

fn add_command(editor: &mut ProjectEditor, name: &QualifiedName) -> Result<(), ScaffoldError> {
    let function_name = snake_case(&name.class);
    if matches!(function_name.as_str(), "serve" | "help") {
        return Err(ScaffoldError::InvalidName(function_name));
    }

    let mut directory = PathBuf::from("app/commands");
    let mut parent_module = directory.join("mod.rs");
    let mut export_path = Vec::new();
    for namespace in &name.modules {
        let module = snake_case(namespace);
        editor.update_managed_lines(
            &parent_module,
            MODULES_START,
            MODULES_END,
            &[format!("pub mod {module};")],
        )?;
        directory.push(&module);
        parent_module = directory.join("mod.rs");
        export_path.push(module);
    }

    editor.create(
        directory.join(format!("{function_name}.rs")),
        command_template(&function_name),
    )?;
    editor.update_managed_lines(
        &parent_module,
        MODULES_START,
        MODULES_END,
        &[
            format!("pub mod {function_name};"),
            format!("pub use {function_name}::{function_name};"),
        ],
    )?;

    if !export_path.is_empty() {
        let path = format!("{}::{function_name}", export_path.join("::"));
        editor.update_managed_lines(
            "app/commands/mod.rs",
            MODULES_START,
            MODULES_END,
            &[format!("pub use {path};")],
        )?;
    }

    editor.update_managed_lines(
        "app/commands/mod.rs",
        COMMANDS_START,
        COMMANDS_END,
        &[format!("{function_name},")],
    )?;
    Ok(())
}

fn add_model(editor: &mut ProjectEditor, model: &QualifiedName) -> Result<(), ScaffoldError> {
    add_rust_item(editor, "app/models", model, &model_template(&model.class))?;
    let path = if model.modules.is_empty() {
        model.class.clone()
    } else {
        format!(
            "{}::{}",
            model
                .modules
                .iter()
                .map(|part| snake_case(part))
                .collect::<Vec<_>>()
                .join("::"),
            model.class
        )
    };
    editor.update_registry(
        "app/models/mod.rs",
        MODELS_START,
        MODELS_END,
        "model",
        &path,
        render_model_registry,
    )
}

fn add_model_migration(
    editor: &mut ProjectEditor,
    model: &QualifiedName,
) -> Result<(), ScaffoldError> {
    let table = pluralize(&snake_case(&model.class));
    add_migration(editor, &format!("create_{table}_table"), &table)
}

fn add_migration(editor: &mut ProjectEditor, name: &str, table: &str) -> Result<(), ScaffoldError> {
    let milliseconds = SystemTime::now()
        .duration_since(UNIX_EPOCH)
        .map_err(|_| ScaffoldError::InvalidClock)?
        .as_millis();
    let id = milliseconds.to_string();
    let module = format!("m_{id}_{name}");
    editor.create(
        format!("database/migrations/{module}.rs"),
        migration_template(&id, name, table),
    )?;
    editor.update_registry(
        "database/migrations/mod.rs",
        MIGRATIONS_START,
        MIGRATIONS_END,
        "migration",
        &module,
        render_migration_registry,
    )
}

fn add_controller_route(
    editor: &mut ProjectEditor,
    controller: &QualifiedName,
    resource: bool,
    action: Option<(&QualifiedName, &QualifiedName)>,
) -> Result<(), ScaffoldError> {
    let base = controller
        .class
        .strip_suffix("Controller")
        .unwrap_or(&controller.class);
    let plural = pluralize(&snake_case(base));
    let namespace_modules = controller
        .modules
        .iter()
        .map(|part| snake_case(part))
        .collect::<Vec<_>>();
    let route_file = if namespace_modules.is_empty() {
        plural.clone()
    } else {
        format!("{}_{}", namespace_modules.join("_"), plural)
    };
    let import = if namespace_modules.is_empty() {
        format!("crate::controllers::{}", controller.class)
    } else {
        format!(
            "crate::controllers::{}::{}",
            namespace_modules.join("::"),
            controller.class
        )
    };
    let route_name = if namespace_modules.is_empty() {
        plural.clone()
    } else {
        format!("{}.{}", namespace_modules.join("."), plural)
    };
    let path = if namespace_modules.is_empty() {
        format!("/{}", plural.replace('_', "-"))
    } else {
        format!(
            "/{}/{}",
            namespace_modules
                .iter()
                .map(|part| kebab_case(part))
                .collect::<Vec<_>>()
                .join("/"),
            plural.replace('_', "-")
        )
    };
    editor.create(
        format!("routes/{route_file}.rs"),
        controller_route_template(
            &import,
            &route_name,
            &path,
            &controller.class,
            resource,
            action,
        ),
    )
}

fn add_page(
    editor: &mut ProjectEditor,
    page: &PageName,
    frontend: ProjectFrontend,
) -> Result<(), ScaffoldError> {
    let props = page_props_name(page);
    add_rust_item(
        editor,
        "app/props",
        &props,
        &page_props_template(&props.class, &page.route),
    )?;
    let mut path = PathBuf::from("views/pages");
    for part in &page.parts[..page.parts.len() - 1] {
        path.push(kebab_case(part));
    }
    path.push(format!(
        "{}.{}",
        kebab_case(page.parts.last().expect("page has one part")),
        frontend.extension()
    ));
    editor.create(
        path,
        page_template(&page.class, &props.class, page.parts.len(), frontend),
    )
}

fn page_props_name(page: &PageName) -> QualifiedName {
    QualifiedName {
        modules: page.parts[..page.parts.len() - 1].to_vec(),
        class: format!("{}Props", page.class),
    }
}

fn model_template(name: &str) -> String {
    format!(
        r"use phoenix::database::Model;

#[derive(Debug, Model)]
pub struct {name} {{
    #[key]
    #[auto]
    pub id: u64,
    pub name: String,
}}
"
    )
}

fn request_template(name: &str) -> String {
    format!(
        r#"use phoenix::prelude::{{Validate, ValidationErrors, Validator, max_length, required, rules, string}};
use serde::Deserialize;

#[phoenix::contract(input)]
#[derive(Debug, Deserialize)]
pub struct {name} {{
    pub name: String,
}}

impl Validate for {name} {{
    fn validate(&self) -> Result<(), ValidationErrors> {{
        let data = serde_json::json!({{ "name": self.name }});
        Validator::new(&data)
            .field("name", rules![required(), string(), max_length(255)])
            .validate()
    }}
}}
"#
    )
}

fn resource_template(name: &str) -> String {
    format!(
        r#"use serde::Serialize;

#[phoenix::contract(resource)]
#[derive(Clone, Debug, Serialize)]
#[serde(rename_all = "camelCase")]
pub struct {name} {{
    pub id: String,
    pub name: String,
}}
"#
    )
}

fn controller_template(name: &str, resource: bool) -> String {
    if !resource {
        return format!(
            r#"use phoenix::prelude::{{Request, Response}};

pub struct {name};

impl {name} {{
    #[allow(clippy::unused_async)]
    pub async fn index(_request: Request) -> Response {{
        Response::text("{name}@index")
    }}
}}
"#
        );
    }
    format!(
        r#"use phoenix::prelude::{{Request, Response, StatusCode}};

pub struct {name};

impl {name} {{
    #[allow(clippy::unused_async)]
    pub async fn index(_request: Request) -> Response {{ Response::text("{name}@index") }}

    #[allow(clippy::unused_async)]
    pub async fn create(_request: Request) -> Response {{ Response::text("{name}@create") }}

    #[allow(clippy::unused_async)]
    pub async fn store(_request: Request) -> Response {{
        Response::text("{name}@store").with_status(StatusCode::CREATED)
    }}

    #[allow(clippy::unused_async)]
    pub async fn show(_request: Request) -> Response {{ Response::text("{name}@show") }}

    #[allow(clippy::unused_async)]
    pub async fn edit(_request: Request) -> Response {{ Response::text("{name}@edit") }}

    #[allow(clippy::unused_async)]
    pub async fn update(_request: Request) -> Response {{ Response::text("{name}@update") }}

    #[allow(clippy::unused_async)]
    pub async fn destroy(_request: Request) -> Response {{
        Response::new(StatusCode::NO_CONTENT, phoenix::http::Bytes::new())
    }}
}}
"#
    )
}

fn model_controller_template(
    controller: &QualifiedName,
    request: &QualifiedName,
    resource: &QualifiedName,
    props: &QualifiedName,
    page: &str,
) -> String {
    let request_path = rust_item_path("requests", request);
    let resource_path = rust_item_path("resources", resource);
    let props_path = rust_item_path("props", props);
    let name = &controller.class;
    let title = page
        .split('/')
        .next()
        .map_or_else(|| "Items".to_owned(), pascal_case);
    format!(
        r#"use phoenix::prelude::{{Json, Page, PageResponseError, Request, Response, StatusCode, Validated}};

use {props_path};
use {request_path};
use {resource_path};

pub struct {name};

impl {name} {{
    pub async fn index(request: Request) -> Result<Response, PageResponseError> {{
        Page::new("{page}", {props_class} {{ title: "{title}".to_owned() }})
            .spa()
            .respond_to(&request, None)
    }}

    #[allow(clippy::unused_async)]
    pub async fn create(_request: Request) -> Response {{ Response::text("{name}@create") }}

    #[allow(clippy::unused_async)]
    pub async fn store(
        Validated(Json(input)): Validated<Json<{request_class}>>,
    ) -> (StatusCode, Json<{resource_class}>) {{
        (
            StatusCode::CREATED,
            Json({resource_class} {{ id: "generated".to_owned(), name: input.name }}),
        )
    }}

    #[allow(clippy::unused_async)]
    pub async fn show(_request: Request) -> Response {{ Response::text("{name}@show") }}

    #[allow(clippy::unused_async)]
    pub async fn edit(_request: Request) -> Response {{ Response::text("{name}@edit") }}

    #[allow(clippy::unused_async)]
    pub async fn update(_request: Request) -> Response {{ Response::text("{name}@update") }}

    #[allow(clippy::unused_async)]
    pub async fn destroy(_request: Request) -> Response {{
        Response::new(StatusCode::NO_CONTENT, phoenix::http::Bytes::new())
    }}
}}
"#,
        props_class = props.class,
        request_class = request.class,
        resource_class = resource.class,
    )
}

fn middleware_template(name: &str) -> String {
    format!(
        r"use phoenix::prelude::{{BoxFuture, Middleware, Next, Request, Response}};

pub struct {name};

impl Middleware for {name} {{
    fn handle(&self, request: Request, next: Next) -> BoxFuture<Response> {{
        Box::pin(async move {{
            // Add authorization, request context, or response policy here.
            next.run(request).await
        }})
    }}
}}
"
    )
}

fn migration_template(id: &str, name: &str, table: &str) -> String {
    format!(
        r#"use phoenix::database::Migration;

#[must_use]
pub fn migration() -> Migration {{
    Migration::new("{id}", "{description}")
        .up("CREATE TABLE {table} (id BIGINT PRIMARY KEY, name TEXT NOT NULL)")
        .down("DROP TABLE {table}")
}}
"#,
        description = name.replace('_', " "),
    )
}

fn controller_route_template(
    import: &str,
    route_name: &str,
    path: &str,
    controller: &str,
    resource: bool,
    action: Option<(&QualifiedName, &QualifiedName)>,
) -> String {
    if !resource {
        return format!(
            "use phoenix::prelude::Routes;\n\nuse {import};\n\n#[must_use]\npub fn routes() -> Routes {{\n    Routes::new()\n        .get(\"{path}\", {controller}::index)\n        .name(\"{route_name}.index\")\n}}\n"
        );
    }
    let parameter = snake_case(controller.strip_suffix("Controller").unwrap_or(controller));
    let (prelude, action_imports, store, action_binding) = action.map_or_else(
        || {
            (
                "Routes".to_owned(),
                String::new(),
                format!("{controller}::store"),
                String::new(),
            )
        },
        |(input, output)| {
            (
                "Routes, typed".to_owned(),
                format!(
                    "use {};\nuse {};\n",
                    rust_item_path("requests", input),
                    rust_item_path("resources", output),
                ),
                format!("typed({controller}::store)"),
                format!("\n        .action::<{}, {}>()", input.class, output.class),
            )
        },
    );
    format!(
        r#"use phoenix::prelude::{{{prelude}}};

use {import};
{action_imports}

#[must_use]
pub fn routes() -> Routes {{
    let member = "{path}/{{{parameter}}}";
    Routes::new()
        .get("{path}", {controller}::index)
        .name("{route_name}.index")
        .get("{path}/create", {controller}::create)
        .name("{route_name}.create")
        .post("{path}", {store})
        .name("{route_name}.store"){action_binding}
        .get(member, {controller}::show)
        .name("{route_name}.show")
        .get(format!("{{member}}/edit"), {controller}::edit)
        .name("{route_name}.edit")
        .put(member, {controller}::update)
        .name("{route_name}.update")
        .patch(member, {controller}::update)
        .delete(member, {controller}::destroy)
        .name("{route_name}.destroy")
}}
"#
    )
}

fn rust_item_path(category: &str, name: &QualifiedName) -> String {
    if name.modules.is_empty() {
        format!("crate::{category}::{}", name.class)
    } else {
        format!(
            "crate::{category}::{}::{}",
            name.modules
                .iter()
                .map(|part| snake_case(part))
                .collect::<Vec<_>>()
                .join("::"),
            name.class,
        )
    }
}

fn page_props_template(name: &str, route: &str) -> String {
    format!(
        r#"use serde::Serialize;

#[phoenix::contract(page, page = "{route}")]
#[derive(Serialize)]
#[serde(rename_all = "camelCase")]
pub struct {name} {{
    pub title: String,
}}
"#
    )
}

fn page_template(component: &str, props: &str, depth: usize, frontend: ProjectFrontend) -> String {
    let contracts = format!("{}generated/contracts.js", "../".repeat(depth));
    if frontend == ProjectFrontend::Jsx {
        return format!(
            r#"export default function {component}({{ title }}) {{
  return (
    <main>
      <h1>{{title}}</h1>
    </main>
  );
}}
"#
        );
    }
    format!(
        r#"import type {{ {props} }} from "{contracts}";

export default function {component}({{ title }}: {props}) {{
  return (
    <main>
      <h1>{{title}}</h1>
    </main>
  );
}}
"#
    )
}

fn island_template(component: &str, frontend: ProjectFrontend) -> String {
    if frontend == ProjectFrontend::Jsx {
        return format!(
            r#"import {{ useState }} from "react";

export default function {component}({{ initialCount = 0 }}) {{
  const [count, setCount] = useState(initialCount);
  return <button type="button" onClick={{() => setCount((value) => value + 1)}}>{{count}}</button>;
}}
"#
        );
    }
    format!(
        r#"import {{ useState }} from "react";

export interface {component}Props {{
  initialCount?: number;
}}

export default function {component}({{ initialCount = 0 }}: {component}Props) {{
  const [count, setCount] = useState(initialCount);
  return <button type="button" onClick={{() => setCount((value) => value + 1)}}>{{count}}</button>;
}}
"#
    )
}

fn render_model_registry(values: &BTreeSet<String>) -> Vec<String> {
    let mut lines = values
        .iter()
        .map(|value| format!("// phoenix:model: {value}"))
        .collect::<Vec<_>>();
    if !lines.is_empty() {
        lines.push(String::new());
    }
    lines.extend([
        "#[must_use]".to_owned(),
        "pub fn all() -> phoenix::database::ModelSet {".to_owned(),
        "    phoenix::database::models!(".to_owned(),
    ]);
    lines.extend(values.iter().map(|value| format!("        {value},")));
    lines.extend(["    )".to_owned(), "}".to_owned()]);
    lines
}

fn render_migration_registry(values: &BTreeSet<String>) -> Vec<String> {
    let mut lines = Vec::new();
    for value in values {
        lines.push(format!("// phoenix:migration: {value}"));
        lines.push(format!("pub mod {value};"));
    }
    if !lines.is_empty() {
        lines.push(String::new());
    }
    lines.extend([
        "#[must_use]".to_owned(),
        "pub fn all() -> Vec<phoenix::database::Migration> {".to_owned(),
        "    vec![".to_owned(),
    ]);
    lines.extend(
        values
            .iter()
            .map(|value| format!("        {value}::migration(),")),
    );
    lines.extend(["    ]".to_owned(), "}".to_owned()]);
    lines
}

struct ProjectEditor {
    root: PathBuf,
    force: bool,
    changes: BTreeMap<PathBuf, String>,
}

impl ProjectEditor {
    fn new(root: &Path, force: bool) -> Self {
        Self {
            root: root.to_path_buf(),
            force,
            changes: BTreeMap::new(),
        }
    }

    fn create(
        &mut self,
        relative: impl Into<PathBuf>,
        content: String,
    ) -> Result<(), ScaffoldError> {
        let relative = safe_relative(relative.into())?;
        let absolute = self.root.join(&relative);
        if !self.force && (absolute.exists() || self.changes.contains_key(&relative)) {
            return Err(ScaffoldError::AlreadyExists(absolute));
        }
        self.changes.insert(relative, content);
        Ok(())
    }

    fn read(&self, relative: &Path) -> Result<String, ScaffoldError> {
        if let Some(content) = self.changes.get(relative) {
            return Ok(content.clone());
        }
        let absolute = self.root.join(relative);
        match fs::read_to_string(&absolute) {
            Ok(content) => Ok(content),
            Err(error) if error.kind() == ErrorKind::NotFound => Ok(String::new()),
            Err(source) => Err(ScaffoldError::Io {
                path: absolute,
                source,
            }),
        }
    }

    fn update_managed_lines(
        &mut self,
        relative: impl AsRef<Path>,
        start: &str,
        end: &str,
        added: &[String],
    ) -> Result<(), ScaffoldError> {
        let relative = safe_relative(relative.as_ref().to_path_buf())?;
        let existing = self.read(&relative)?;
        let initialized = if existing.is_empty() {
            format!("{start}\n{end}\n")
        } else {
            existing
        };
        let (before, managed, after) = managed_parts(&initialized, start, end)
            .ok_or_else(|| ScaffoldError::InvalidManagedFile(self.root.join(&relative)))?;
        let mut lines = managed
            .lines()
            .map(str::trim)
            .filter(|line| !line.is_empty())
            .map(str::to_owned)
            .collect::<BTreeSet<_>>();
        lines.extend(added.iter().cloned());
        let body = lines.into_iter().collect::<Vec<_>>().join("\n");
        let body = if body.is_empty() {
            body
        } else {
            format!("{body}\n")
        };
        self.changes
            .insert(relative, format!("{before}{start}\n{body}{end}{after}"));
        Ok(())
    }

    fn update_registry(
        &mut self,
        relative: impl AsRef<Path>,
        start: &str,
        end: &str,
        key: &str,
        value: &str,
        render: fn(&BTreeSet<String>) -> Vec<String>,
    ) -> Result<(), ScaffoldError> {
        let relative = safe_relative(relative.as_ref().to_path_buf())?;
        let existing = self.read(&relative)?;
        let initialized = if existing.is_empty() {
            format!("{start}\n{end}\n")
        } else {
            existing
        };
        let (before, managed, after) = managed_parts(&initialized, start, end)
            .ok_or_else(|| ScaffoldError::InvalidManagedFile(self.root.join(&relative)))?;
        let prefix = format!("// phoenix:{key}: ");
        let mut values = managed
            .lines()
            .filter_map(|line| line.trim().strip_prefix(&prefix).map(str::to_owned))
            .collect::<BTreeSet<_>>();
        values.insert(value.to_owned());
        let rendered = render(&values).join("\n");
        let body = if rendered.is_empty() {
            rendered
        } else {
            format!("{rendered}\n")
        };
        self.changes
            .insert(relative, format!("{before}{start}\n{body}{end}{after}"));
        Ok(())
    }

    fn commit(self) -> Result<Vec<PathBuf>, ScaffoldError> {
        let mut written = Vec::with_capacity(self.changes.len());
        for (relative, content) in self.changes {
            let path = self.root.join(relative);
            if let Some(parent) = path.parent() {
                fs::create_dir_all(parent).map_err(|source| ScaffoldError::Io {
                    path: parent.to_path_buf(),
                    source,
                })?;
            }
            fs::write(&path, content).map_err(|source| ScaffoldError::Io {
                path: path.clone(),
                source,
            })?;
            written.push(path);
        }
        Ok(written)
    }
}

fn managed_parts<'a>(
    content: &'a str,
    start: &str,
    end: &str,
) -> Option<(&'a str, &'a str, &'a str)> {
    let start_index = content.find(start)?;
    let managed_start = start_index + start.len();
    let end_relative = content[managed_start..].find(end)?;
    let end_index = managed_start + end_relative;
    if content[end_index + end.len()..].contains(end) || content[..start_index].contains(start) {
        return None;
    }
    Some((
        &content[..start_index],
        content[managed_start..end_index].trim_matches('\n'),
        &content[end_index + end.len()..],
    ))
}

#[derive(Clone, Debug)]
struct QualifiedName {
    modules: Vec<String>,
    class: String,
}

impl QualifiedName {
    fn parse(value: &str) -> Result<Self, ScaffoldError> {
        let parts = name_parts(value)?;
        let class = pascal_case(parts.last().expect("validated names have a leaf"));
        let modules = parts[..parts.len() - 1]
            .iter()
            .map(|part| pascal_case(part))
            .collect();
        Ok(Self { modules, class })
    }

    fn parse_with_suffix(value: &str, suffix: &str) -> Result<Self, ScaffoldError> {
        let mut name = Self::parse(value)?;
        if !name.class.ends_with(suffix) {
            name.class.push_str(suffix);
        }
        Ok(name)
    }

    fn with_leaf(&self, class: String) -> Self {
        Self {
            modules: self.modules.clone(),
            class,
        }
    }

    fn index_page_name(&self) -> PageName {
        let mut parts = self.modules.clone();
        parts.push(pluralize(&self.class));
        parts.push("Index".to_owned());
        PageName::from_parts(parts)
    }
}

#[derive(Clone, Debug)]
struct PageName {
    parts: Vec<String>,
    route: String,
    class: String,
}

impl PageName {
    fn parse(value: &str) -> Result<Self, ScaffoldError> {
        let parts = name_parts(value)?
            .into_iter()
            .map(|part| pascal_case(&part))
            .collect();
        Ok(Self::from_parts(parts))
    }

    fn from_parts(parts: Vec<String>) -> Self {
        let route = parts
            .iter()
            .map(|part| kebab_case(part))
            .collect::<Vec<_>>()
            .join("/");
        let class = parts.iter().map(String::as_str).collect::<String>();
        Self {
            parts,
            route,
            class,
        }
    }
}

fn name_parts(value: &str) -> Result<Vec<String>, ScaffoldError> {
    let normalized = value.replace("::", "/").replace('\\', "/");
    let parts = normalized
        .split('/')
        .filter(|part| !part.is_empty())
        .map(str::to_owned)
        .collect::<Vec<_>>();
    if parts.is_empty()
        || parts.iter().any(|part| {
            !part.chars().all(|character| {
                character.is_ascii_alphanumeric() || character == '_' || character == '-'
            }) || !part
                .chars()
                .any(|character| character.is_ascii_alphabetic())
        })
    {
        return Err(ScaffoldError::InvalidName(value.to_owned()));
    }
    Ok(parts)
}

fn package_name(value: &str) -> Result<String, ScaffoldError> {
    let value = kebab_case(value).trim_matches('-').to_owned();
    if value.is_empty()
        || value.starts_with(|character: char| character.is_ascii_digit())
        || !value.chars().all(|character| {
            character.is_ascii_lowercase() || character.is_ascii_digit() || character == '-'
        })
    {
        return Err(ScaffoldError::InvalidName(value));
    }
    Ok(value)
}

fn snake_identifier(value: &str) -> Result<String, ScaffoldError> {
    let parts = name_parts(value)?;
    Ok(parts
        .iter()
        .map(|part| snake_case(part))
        .collect::<Vec<_>>()
        .join("_"))
}

fn pascal_case(value: &str) -> String {
    words(value)
        .into_iter()
        .map(|word| {
            let mut characters = word.chars();
            characters.next().map_or_else(String::new, |first| {
                format!(
                    "{}{}",
                    first.to_ascii_uppercase(),
                    characters.as_str().to_ascii_lowercase()
                )
            })
        })
        .collect()
}

fn snake_case(value: &str) -> String {
    words(value).join("_").to_ascii_lowercase()
}

fn kebab_case(value: &str) -> String {
    words(value).join("-").to_ascii_lowercase()
}

fn words(value: &str) -> Vec<String> {
    let mut output = String::new();
    let mut previous_lower_or_digit = false;
    for character in value.chars() {
        if character == '-' || character == '_' || character.is_ascii_whitespace() {
            if !output.ends_with('_') && !output.is_empty() {
                output.push('_');
            }
            previous_lower_or_digit = false;
        } else {
            if character.is_ascii_uppercase() && previous_lower_or_digit {
                output.push('_');
            }
            output.push(character);
            previous_lower_or_digit = character.is_ascii_lowercase() || character.is_ascii_digit();
        }
    }
    output
        .split('_')
        .filter(|part| !part.is_empty())
        .map(str::to_owned)
        .collect()
}

fn pluralize(value: &str) -> String {
    if let Some(stem) = value.strip_suffix('y')
        && !stem.ends_with(['a', 'e', 'i', 'o', 'u'])
    {
        return format!("{stem}ies");
    }
    if value.ends_with(['s', 'x', 'z']) || value.ends_with("ch") || value.ends_with("sh") {
        format!("{value}es")
    } else {
        format!("{value}s")
    }
}

fn inferred_table(migration: &str) -> &str {
    migration
        .strip_prefix("create_")
        .and_then(|name| name.strip_suffix("_table"))
        .unwrap_or(migration)
}

fn safe_relative(path: PathBuf) -> Result<PathBuf, ScaffoldError> {
    if path.is_absolute()
        || path
            .components()
            .any(|component| !matches!(component, Component::Normal(_)))
    {
        return Err(ScaffoldError::InvalidName(path.display().to_string()));
    }
    Ok(path)
}

fn absolute_path(path: impl AsRef<Path>) -> Result<PathBuf, ScaffoldError> {
    let path = path.as_ref();
    if path.is_absolute() {
        return Ok(path.to_path_buf());
    }
    env::current_dir()
        .map(|current| current.join(path))
        .map_err(|source| ScaffoldError::Io {
            path: path.to_path_buf(),
            source,
        })
}

fn ensure_empty_target(path: &Path) -> Result<(), ScaffoldError> {
    match fs::read_dir(path) {
        Ok(mut entries) => {
            if entries.next().is_some() {
                Err(ScaffoldError::ProjectNotEmpty(path.to_path_buf()))
            } else {
                Ok(())
            }
        }
        Err(error) if error.kind() == ErrorKind::NotFound => Ok(()),
        Err(source) => Err(ScaffoldError::Io {
            path: path.to_path_buf(),
            source,
        }),
    }
}

fn json_string(value: &str) -> String {
    serde_json::to_string(value).expect("strings always serialize")
}

fn run_optional(program: &'static str, args: &[&str], cwd: &Path) -> Result<(), ScaffoldError> {
    match Command::new(program).args(args).current_dir(cwd).status() {
        Ok(status) if status.success() => Ok(()),
        Ok(_) => Err(ScaffoldError::CommandFailed { program }),
        Err(error) if error.kind() == ErrorKind::NotFound => Ok(()),
        Err(source) => Err(ScaffoldError::Io {
            path: cwd.to_path_buf(),
            source,
        }),
    }
}

fn run_required(program: &'static str, args: &[&str], cwd: &Path) -> Result<(), ScaffoldError> {
    match Command::new(program).args(args).current_dir(cwd).status() {
        Ok(status) if status.success() => Ok(()),
        Ok(_) => Err(ScaffoldError::CommandFailed { program }),
        Err(source) => Err(ScaffoldError::Io {
            path: cwd.to_path_buf(),
            source,
        }),
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    fn temporary_directory(label: &str) -> PathBuf {
        let id = SystemTime::now()
            .duration_since(UNIX_EPOCH)
            .unwrap()
            .as_nanos();
        env::temp_dir().join(format!("phoenix-cli-{label}-{}-{id}", std::process::id()))
    }

    fn framework_root() -> PathBuf {
        PathBuf::from(env!("CARGO_MANIFEST_DIR"))
            .join("../..")
            .canonicalize()
            .unwrap()
    }

    #[test]
    fn creates_a_complete_local_project_without_installing() {
        let root = temporary_directory("new");
        create_project(
            &NewProjectOptions::new(&root)
                .dependencies(DependencySource::Local(framework_root()))
                .database(Some(ProjectDatabase::Sqlite))
                .initialize_git(false)
                .install_dependencies(false),
        )
        .unwrap();

        assert!(root.join("src/main.rs").is_file());
        assert!(root.join("src/bin/phoenix-manage.rs").is_file());
        assert!(root.join("config/app.toml").is_file());
        assert!(root.join("config/database.toml").is_file());
        assert!(
            root.join("config/schemas/phoenix-config-database.schema.json")
                .is_file()
        );
        assert!(root.join("taplo.toml").is_file());
        assert!(
            fs::read_to_string(root.join("config/database.toml"))
                .unwrap()
                .contains("connections.mysql")
        );
        assert!(root.join("app/commands/mod.rs").is_file());
        assert!(root.join("config/mod.rs").is_file());
        assert!(root.join("database/seeders/mod.rs").is_file());
        assert!(root.join("routes/web.rs").is_file());
        assert!(root.join("views/pages/home.tsx").is_file());
        let manifest = fs::read_to_string(root.join("Cargo.toml")).unwrap();
        assert!(manifest.contains("crates/phoenix"));
        assert!(manifest.contains("default-run = \"phoenix-cli-new-"));
        assert!(manifest.contains("default = [\"sqlite\"]"));
        assert!(manifest.contains("sqlite = [\"database\", \"phoenix/sqlite\"]"));
        assert!(manifest.contains("features = [\"migration\", \"serde\", \"sqlite\"]"));
        assert!(manifest.contains("tls = [\"phoenix/tls\"]"));
        assert!(manifest.contains("websocket = [\"phoenix/websocket\"]"));
        assert!(manifest.contains("sse = [\"phoenix/sse\"]"));
        assert!(manifest.contains("default-features = false"));
        assert!(manifest.contains("opt-level = \"z\""));
        assert!(manifest.contains("strip = \"symbols\""));
        assert!(
            fs::read_to_string(root.join("package.json"))
                .unwrap()
                .contains("file:")
        );
        let main = fs::read_to_string(root.join("src/main.rs")).unwrap();
        assert!(main.contains("Console::new"));
        assert!(main.contains("commands::registry()"));
        assert!(main.contains(".serve("));
        let commands = fs::read_to_string(root.join("app/commands/mod.rs")).unwrap();
        assert!(commands.contains("commands!"));
        assert!(commands.contains("<phoenix:commands>"));
        let application = fs::read_to_string(root.join("src/lib.rs")).unwrap();
        assert!(application.contains("pub mod commands"));
        assert!(application.contains("NonceSecurityPolicy::development"));
        assert!(application.contains("with_middleware(content_security_policy(config))"));
        assert!(application.contains("with_middleware(RequestId)"));
        assert!(application.contains("with_middleware(AccessLog)"));
        assert!(application.contains("SessionMiddleware::new"));
        assert!(application.contains("with_middleware(Csrf)"));
        assert!(application.contains("TrustedProxies::new"));
        assert!(application.contains("HostAllowlist::new"));
        assert!(application.contains("RateLimit::new"));
        assert!(application.contains("StateMiddleware::new(config.clone())"));
        assert!(application.contains("StateMiddleware::new(renderer.clone())"));
        assert!(application.contains("RendererConfig::production"));
        assert!(application.contains("renderer.warm_up().await"));
        let home_controller =
            fs::read_to_string(root.join("app/controllers/home_controller.rs")).unwrap();
        assert!(home_controller.contains("get::<NodeRenderer>().cloned()"));
        assert!(home_controller.contains("respond_with_renderer(&request, &renderer).await"));
        let home_route = fs::read_to_string(root.join("routes/web.rs")).unwrap();
        assert!(home_route.contains(".get(\"/\", HomeController::index)"));
        let cargo = env::var_os("CARGO").unwrap_or_else(|| "cargo".into());
        let status = Command::new(cargo)
            .args(["check", "--quiet"])
            .current_dir(&root)
            .status()
            .unwrap();
        assert!(status.success());
        let config = fs::read_to_string(root.join("config/mod.rs")).unwrap();
        assert!(config.contains("AppConfig::load()"));
        assert!(config.lines().count() < 20);
        let manager = fs::read_to_string(root.join("src/bin/phoenix-manage.rs")).unwrap();
        assert!(manager.contains("MigrationRunner::new"));
        assert!(manager.contains("migrations::all()"));
        assert!(manager.contains("seeders::run"));
        let models = fs::read_to_string(root.join("app/models/mod.rs")).unwrap();
        let migrations = fs::read_to_string(root.join("database/migrations/mod.rs")).unwrap();
        assert!(models.contains("pub fn all()"));
        assert!(migrations.contains("pub fn all()"));
        fs::remove_dir_all(root).unwrap();
    }

    #[test]
    fn default_project_is_islands_without_database_or_git() {
        let root = temporary_directory("default-options");
        let options = NewProjectOptions::new(&root)
            .dependencies(DependencySource::Local(framework_root()))
            .install_dependencies(false);
        assert!(!options.initialize_git);
        assert_eq!(options.render_mode, ProjectRenderMode::Islands);
        assert_eq!(options.database, None);
        assert_eq!(options.frontend, ProjectFrontend::Tsx);
        create_project(&options).unwrap();

        let cargo = fs::read_to_string(root.join("Cargo.toml")).unwrap();
        assert!(cargo.contains("default = []"));
        assert!(!cargo.contains("toasty ="));
        assert!(!root.join("config/database.toml").exists());
        assert!(!root.join("src/bin/phoenix-manage.rs").exists());
        assert!(
            fs::read_to_string(root.join("app/controllers/home_controller.rs"))
                .unwrap()
                .contains(".islands()")
        );
        assert!(!root.join(".git").exists());

        let cargo = env::var_os("CARGO").unwrap_or_else(|| "cargo".into());
        let status = Command::new(cargo)
            .args(["check", "--quiet"])
            .current_dir(&root)
            .status()
            .unwrap();
        assert!(status.success());
        fs::remove_dir_all(root).unwrap();
    }

    #[test]
    fn project_options_select_jsx_tailwind_and_database() {
        let root = temporary_directory("options");
        create_project(
            &NewProjectOptions::new(&root)
                .dependencies(DependencySource::Local(framework_root()))
                .database(Some(ProjectDatabase::Pgsql))
                .render_mode(ProjectRenderMode::Ssr)
                .frontend(ProjectFrontend::Jsx)
                .tailwind(true)
                .install_dependencies(false),
        )
        .unwrap();

        let cargo = fs::read_to_string(root.join("Cargo.toml")).unwrap();
        assert!(cargo.contains("default = [\"pgsql\"]"));
        assert!(cargo.contains("\"postgresql\""));
        assert!(root.join("views/pages/home.jsx").is_file());
        assert!(!root.join("views/pages/home.tsx").exists());
        assert!(
            fs::read_to_string(root.join("app/controllers/home_controller.rs"))
                .unwrap()
                .contains(".ssr()")
        );
        assert!(
            fs::read_to_string(root.join("package.json"))
                .unwrap()
                .contains("@tailwindcss/vite")
        );
        assert!(
            fs::read_to_string(root.join("views/styles.css"))
                .unwrap()
                .starts_with("@import \"tailwindcss\";")
        );
        assert!(
            fs::read_to_string(root.join("vite.config.ts"))
                .unwrap()
                .contains("tailwindcss()")
        );
        let generator = ProjectGenerator::discover(&root).unwrap();
        generator
            .page("reports/index", GenerateOptions::default())
            .unwrap();
        generator
            .island("Counter", GenerateOptions::default())
            .unwrap();
        assert!(root.join("views/pages/reports/index.jsx").is_file());
        assert!(root.join("views/islands/counter.jsx").is_file());
        assert!(
            !fs::read_to_string(root.join("views/pages/reports/index.jsx"))
                .unwrap()
                .contains("import type")
        );
        fs::remove_dir_all(root).unwrap();
    }

    #[test]
    fn all_database_option_writes_all_toasty_drivers() {
        let root = temporary_directory("all-databases");
        create_project(
            &NewProjectOptions::new(&root)
                .dependencies(DependencySource::Local(framework_root()))
                .database(Some(ProjectDatabase::All))
                .install_dependencies(false),
        )
        .unwrap();
        let cargo = fs::read_to_string(root.join("Cargo.toml")).unwrap();
        assert!(cargo.contains(
            "toasty = { version = \"0.8\", default-features = false, features = [\"migration\", \"mysql\", \"postgresql\", \"serde\", \"sqlite\"] }"
        ));
        assert!(cargo.contains("all-databases = [\"database\", \"phoenix/sqlite\", \"phoenix/pgsql\", \"phoenix/mysql\"]"));
        let cargo = env::var_os("CARGO").unwrap_or_else(|| "cargo".into());
        let status = Command::new(cargo)
            .args(["check", "--quiet"])
            .current_dir(&root)
            .status()
            .unwrap();
        assert!(status.success());
        fs::remove_dir_all(root).unwrap();
    }

    #[test]
    fn make_command_registers_async_handler() {
        let root = temporary_directory("command");
        create_project(
            &NewProjectOptions::new(&root)
                .dependencies(DependencySource::Local(framework_root()))
                .database(Some(ProjectDatabase::Sqlite))
                .initialize_git(false)
                .install_dependencies(false),
        )
        .unwrap();
        let generator = ProjectGenerator::discover(&root).unwrap();
        generator
            .command("Update", GenerateOptions::default())
            .unwrap();

        assert!(root.join("app/commands/update.rs").is_file());
        let module = fs::read_to_string(root.join("app/commands/mod.rs")).unwrap();
        assert!(module.contains("pub mod update;"));
        assert!(module.contains("pub use update::update;"));
        assert!(module.contains("update,"));
        let command = fs::read_to_string(root.join("app/commands/update.rs")).unwrap();
        assert!(command.contains("pub async fn update"));
        assert!(command.contains("CommandContext<'_>"));
        fs::remove_dir_all(root).unwrap();
    }

    #[test]
    fn model_all_registers_every_supported_business_artifact() {
        let root = temporary_directory("model-all");
        create_project(
            &NewProjectOptions::new(&root)
                .dependencies(DependencySource::Local(framework_root()))
                .database(Some(ProjectDatabase::Sqlite))
                .initialize_git(false)
                .install_dependencies(false),
        )
        .unwrap();
        let generator = ProjectGenerator::discover(&root).unwrap();
        generator
            .model(
                "Admin/Post",
                ModelOptions {
                    all: true,
                    ..ModelOptions::default()
                },
            )
            .unwrap();
        generator.model("Comment", ModelOptions::default()).unwrap();

        assert!(root.join("app/models/admin/post.rs").is_file());
        assert!(
            root.join("app/controllers/admin/post_controller.rs")
                .is_file()
        );
        assert!(
            root.join("app/requests/admin/store_post_request.rs")
                .is_file()
        );
        assert!(root.join("app/resources/admin/post_resource.rs").is_file());
        assert!(root.join("routes/admin_posts.rs").is_file());
        assert!(root.join("views/pages/admin/posts/index.tsx").is_file());
        let routes = fs::read_to_string(root.join("routes/admin_posts.rs")).unwrap();
        assert!(routes.contains(".name(\"admin.posts.index\")"));
        assert!(routes.contains(".name(\"admin.posts.destroy\")"));
        assert!(routes.contains("typed(PostController::store)"));
        assert!(routes.contains(".action::<StorePostRequest, PostResource>()"));
        let controller =
            fs::read_to_string(root.join("app/controllers/admin/post_controller.rs")).unwrap();
        assert!(controller.contains("Validated(Json(input))"));
        assert!(controller.contains("Page::new(\"admin/posts/index\""));
        let page = fs::read_to_string(root.join("views/pages/admin/posts/index.tsx")).unwrap();
        assert!(page.contains("../../../generated/contracts.js"));
        let models = fs::read_to_string(root.join("app/models/mod.rs")).unwrap();
        assert!(models.contains("admin::Post"));
        assert!(models.contains("Comment"));
        let migrations = fs::read_to_string(root.join("database/migrations/mod.rs")).unwrap();
        assert!(migrations.contains("pub fn all()"));
        fs::remove_dir_all(root).unwrap();
    }

    #[test]
    fn generators_refuse_overwrites_and_path_traversal() {
        let root = temporary_directory("safety");
        create_project(
            &NewProjectOptions::new(&root)
                .dependencies(DependencySource::Local(framework_root()))
                .database(Some(ProjectDatabase::Sqlite))
                .initialize_git(false)
                .install_dependencies(false),
        )
        .unwrap();
        let generator = ProjectGenerator::discover(&root).unwrap();
        generator
            .controller("Report", ControllerOptions::default())
            .unwrap();
        assert!(matches!(
            generator.controller("Report", ControllerOptions::default()),
            Err(ScaffoldError::AlreadyExists(_))
        ));
        assert!(matches!(
            generator.page("../outside", GenerateOptions::default()),
            Err(ScaffoldError::InvalidName(_))
        ));
        fs::remove_dir_all(root).unwrap();
    }
}