mdmodels 0.2.9

/*
 * Copyright (c) 2025 Jan Range
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 */

use crate::{datamodel::DataModel, exporters::Templates};
use colored::Colorize;
use convert_case::Casing;
use serde::{Deserialize, Serialize};
use std::{
    collections::HashMap,
    error::Error,
    fs,
    path::{Path, PathBuf},
    str::FromStr,
};

/// Represents a template with metadata and generation specifications.
#[derive(Debug, Serialize, Deserialize)]
struct GenTemplate {
    meta: Meta,
    generate: HashMap<String, GenSpecs>,
}

impl GenTemplate {
    pub fn prepend_root(&mut self, path: &Path) {
        for (_, specs) in self.generate.iter_mut() {
            specs.prepend_root(path);
        }

        self.meta.paths = self
            .meta
            .paths
            .iter_mut()
            .map(|spec| path.join(spec))
            .collect();
    }
}

/// Represents metadata for the template.
#[derive(Debug, Serialize, Deserialize)]
struct Meta {
    name: Option<String>,
    description: Option<String>,
    paths: Vec<PathBuf>,
}

/// Represents generation specifications for a template.
#[derive(Debug, Serialize, Deserialize)]
struct GenSpecs {
    description: Option<String>,
    out: PathBuf,
    root: Option<String>,
    #[serde(rename = "per-spec")]
    per_spec: Option<bool>,
    #[serde(flatten)]
    #[serde(deserialize_with = "deserialize_config_map")]
    config: HashMap<String, String>,
    #[serde(rename = "fname-case", default)]
    fname_case: Option<NameCase>,
}

fn deserialize_config_map<'de, D>(deserializer: D) -> Result<HashMap<String, String>, D::Error>
where
    D: serde::Deserializer<'de>,
{
    let map: HashMap<String, toml::Value> = HashMap::deserialize(deserializer)?;
    Ok(map.into_iter().map(|(k, v)| (k, v.to_string())).collect())
}

impl GenSpecs {
    pub fn prepend_root(&mut self, path: &Path) {
        if path.is_file() {
            panic!("Root to prepend is not a directory.");
        }

        self.out = path.join(&self.out);
    }
}

/// Sate that determines whether objects are merged or not.
#[derive(Debug)]
enum MergeState {
    Merge,
    NoMerge,
}

impl From<bool> for MergeState {
    fn from(value: bool) -> Self {
        if value {
            MergeState::NoMerge
        } else {
            MergeState::Merge
        }
    }
}

/// Processes the pipeline by reading the template file, building the data model, and generating files based on the specifications.
///
/// # Arguments
///
/// * `path` - Path to the template file.
///
/// # Returns
///
/// A Result indicating success or failure.
pub fn process_pipeline(path: &PathBuf) -> Result<(), Box<dyn std::error::Error>> {
    let content = std::fs::read_to_string(path)?;
    let mut gen_template: GenTemplate = toml::from_str(content.as_str()).unwrap();

    if let Some(parent) = path.parent() {
        gen_template.prepend_root(parent);
    }

    let paths = gen_template.meta.paths.as_slice();

    for (name, mut specs) in gen_template.generate.into_iter() {
        let template = Templates::from_str(name.as_str())?;
        let merge_state = MergeState::from(specs.per_spec.unwrap_or(false));

        match template {
            Templates::JsonSchema => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::JsonSchemaAll => {
                serialize_all_json_schemes(&specs.out, paths, &merge_state)?;
            }
            Templates::JsonLd => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Linkml => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Shex => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Shacl => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Markdown => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Owl => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::CompactMarkdown => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::PythonDataclass => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::PythonPydantic => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::PythonPydanticXML => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::XmlSchema => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Typescript => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::TypescriptZod => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Rust => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Golang => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Julia => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Protobuf => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Graphql => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::MkDocs => {
                // If the template is not set to merge, then disable the navigation.
                if let MergeState::Merge = merge_state {
                    if !specs.config.contains_key("nav") {
                        specs.config.insert("nav".to_string(), "false".to_string());
                    }
                }

                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Mermaid => {
                serialize_by_template(
                    &specs.out,
                    paths,
                    &merge_state,
                    &template,
                    &specs.config,
                    &specs.fname_case,
                )?;
            }
            Templates::Internal => {
                let model = build_models(paths)?;
                serialize_to_internal_schema(model, &specs.out, &merge_state)?;
            }
        }
    }

    Ok(())
}

/// Builds the data model by reading and merging multiple paths.
///
/// # Arguments
///
/// * `paths` - A slice of PathBuf representing the paths to read.
///
/// # Returns
///
/// A Result containing the DataModel or an error.
fn build_models(paths: &[PathBuf]) -> Result<DataModel, Box<dyn Error>> {
    let first_path = paths.first().unwrap();
    path_exists(first_path)?;

    let mut model = DataModel::from_markdown(first_path).map_err(|e| {
        e.log_result();
        format!("Error parsing markdown content: {e:#?}")
    })?;

    if paths.len() == 1 {
        return Ok(model);
    }

    for path in paths.iter().skip(1) {
        path_exists(path)?;
        let new_model = DataModel::from_markdown(path)?;
        model.merge(&new_model);
    }

    Ok(model)
}

/// Checks if the given path exists.
///
/// # Arguments
///
/// * `path` - A reference to a PathBuf to check.
///
/// # Returns
///
/// A Result indicating success or failure.
fn path_exists(path: &PathBuf) -> Result<(), Box<dyn Error>> {
    if !path.exists() {
        return Err(format!("Path does not exist: {path:?}").into());
    }
    Ok(())
}

/// Serializes the data model to the internal schema.
///
/// Please note, this format may only be used for internal purposes.
///
/// # Arguments
///
/// * `model` - The DataModel to serialize.
/// * `out` - The output path for the internal schema file.
///
/// # Returns
///
/// A Result indicating success or failure.
fn serialize_to_internal_schema(
    model: DataModel,
    out: &PathBuf,
    merge_state: &MergeState,
) -> Result<(), Box<dyn Error>> {
    match merge_state {
        MergeState::Merge => {
            let schema = model.internal_schema();
            save_to_file(out, &schema)?;
            print_render_msg(out, &Templates::Internal);
            Ok(())
        }
        MergeState::NoMerge => {
            Err("Per spec is not supported for internal schema generation at the moment.".into())
        }
    }
}

/// Serializes all JSON schemas for the data model to the specified output directory.
///
/// # Arguments
///
/// * `model` - The DataModel to serialize.
/// * `out` - The output directory for the JSON schema files.
///
/// # Returns
///
/// A Result indicating success or failure.
fn serialize_all_json_schemes(
    out: &PathBuf,
    specs: &[PathBuf],
    merge_state: &MergeState,
) -> Result<(), Box<dyn Error>> {
    if out.is_file() {
        return Err("Output path is a file".into());
    }
    if !out.exists() {
        fs::create_dir_all(out)?;
    }

    match merge_state {
        MergeState::Merge => {
            let model = build_models(specs)?;
            model.json_schema_all(out.to_path_buf(), false)?;
            print_render_msg(out, &Templates::JsonSchemaAll);
            Ok(())
        }
        MergeState::NoMerge => {
            for spec in specs {
                let model = DataModel::from_markdown(spec)?;
                let path = out.join(get_file_name(spec));
                model.json_schema_all(path.to_path_buf(), false)?;
                print_render_msg(&path, &Templates::JsonSchemaAll);
            }
            Ok(())
        }
    }
}

/// Serializes the data model by the specified template.
///
/// # Arguments
///
/// * `out` - The output path for the serialized data model.
/// * `specs` - A slice of PathBuf representing the paths to read.
/// * `merge_state` - The merge state.
/// * `template` - The template to use for serialization.
///
/// # Returns
///
/// A Result indicating success or failure.
fn serialize_by_template(
    out: &PathBuf,
    specs: &[PathBuf],
    merge_state: &MergeState,
    template: &Templates,
    config: &HashMap<String, String>,
    case: &Option<NameCase>,
) -> Result<(), Box<dyn Error>> {
    match merge_state {
        MergeState::Merge => {
            print_render_msg(out, template);

            let mut model = build_models(specs)?;
            let content = model.convert_to(template, Some(config))?;

            return save_to_file(out, content.as_str());
        }
        MergeState::NoMerge => {
            if !has_wildcard_fname(out) {
                return Err("
                    Output file name must contain a wildcard.
                    For example, a valid wildcard is 'path/to/*.json'"
                    .into());
            }

            for spec in specs {
                if !spec.exists() {
                    return Err(format!("Path does not exist: {spec:?}").into());
                }

                let mut fname = get_file_name(spec);

                if let Some(case) = case {
                    fname = casify_filename(fname, case.into());
                }

                let path = replace_wildcard(out, &fname);
                print_render_msg(&path, template);

                let mut model = DataModel::from_markdown(spec)?;
                let content = model.convert_to(template, Some(config))?;

                save_to_file(&path, content.as_str())?;
            }
        }
    }

    Ok(())
}

/// Converts a filename to the specified case format.
///
/// # Arguments
///
/// * `name` - The filename to convert
/// * `case` - The case format to convert to
///
/// # Returns
///
/// The converted filename as a String
fn casify_filename(name: String, case: Option<convert_case::Case>) -> String {
    if let Some(c) = case {
        let (name, _) = name.split_once('.').unwrap_or((name.as_str(), ""));
        let new_name = name.to_case(c);

        new_name.to_string()
    } else {
        name
    }
}

/// Checks if the given path has a wildcard file name.
///
/// # Arguments
///
/// * `path` - The path to check.
///
/// # Returns
///
/// A boolean indicating if the path has a wildcard file name.
fn has_wildcard_fname(path: &Path) -> bool {
    let path_str = path.to_str().unwrap();
    path_str.contains("*")
}

/// Replaces the wildcard in the given path with the given name.
///
/// # Arguments
///
/// * `path` - The path to replace the wildcard file name.
/// * `name` - The name to replace the wildcard file name with.
///
/// # Returns
///
/// A PathBuf with the wildcard replaced.
fn replace_wildcard(path: &Path, name: &str) -> PathBuf {
    let path_str = path.to_str().unwrap();
    let new_path = path_str.replace('*', name);
    PathBuf::from(new_path)
}

/// Gets the file name without the extension.
///
/// # Arguments
///
/// * `path` - The path to get the file name from.
///
/// # Returns
///
/// A string containing the file name without the extension.
fn get_file_name(path: &Path) -> String {
    // Get the filename without the extension
    let file_name = path.file_name().unwrap().to_str().unwrap();
    let file_name = file_name.split('.').collect::<Vec<&str>>()[0];
    file_name.to_string()
}

/// Saves the given content to the specified file.
///
/// # Arguments
///
/// * `out` - The output path for the file.
/// * `content` - The content to write to the file.
///
/// # Returns
///
/// A Result indicating success or failure.
fn save_to_file(out: &PathBuf, content: &str) -> Result<(), Box<dyn Error>> {
    let dir = out.parent().unwrap();
    if !dir.exists() {
        fs::create_dir_all(dir)?;
    }

    fs::write(out, content.trim()).map_err(|e| format!("Error writing to file: {e:#?}"))?;
    Ok(())
}

fn print_render_msg(out: &Path, template: &Templates) {
    println!(
        " [{}] Writing to '{}'",
        template.to_string().green().bold(),
        out.to_str().unwrap().to_string().bold(),
    );
}

/// Represents different case styles for naming files.
///
/// Supports common case conventions used in programming:
/// - Pascal case (e.g. "MyFileName")
/// - Snake case (e.g. "my_file_name")
/// - Kebab case (e.g. "my-file-name")
/// - Camel case (e.g. "myFileName")
/// - None (no case transformation)
#[derive(Debug, Deserialize, Serialize)]
enum NameCase {
    Pascal,
    Snake,
    Kebab,
    Camel,
    None,
}

impl FromStr for NameCase {
    type Err = String;

    /// Converts a string to a NameCase variant.
    ///
    /// # Arguments
    ///
    /// * `s` - The string to convert
    ///
    /// # Returns
    ///
    /// A Result containing the NameCase variant or an error string if invalid.
    fn from_str(s: &str) -> Result<Self, Self::Err> {
        match s {
            "pascal" => Ok(NameCase::Pascal),
            "snake" => Ok(NameCase::Snake),
            "kebab" => Ok(NameCase::Kebab),
            "camel" => Ok(NameCase::Camel),
            _ => Err("Invalid name case".to_string()),
        }
    }
}

impl<'a> From<&'a NameCase> for Option<convert_case::Case<'a>> {
    /// Converts a NameCase variant to the corresponding convert_case::Case variant.
    ///
    /// # Arguments
    ///
    /// * `value` - The NameCase variant to convert
    ///
    /// # Returns
    ///
    /// An Option containing the convert_case::Case variant, or None if no transformation needed.
    fn from(value: &NameCase) -> Self {
        match value {
            NameCase::Pascal => Some(convert_case::Case::Pascal),
            NameCase::Snake => Some(convert_case::Case::Snake),
            NameCase::Kebab => Some(convert_case::Case::Kebab),
            NameCase::Camel => Some(convert_case::Case::Camel),
            NameCase::None => None,
        }
    }
}

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

    #[test]
    fn test_has_wildcard_fname() {
        let path = PathBuf::from("path/to/*.json");
        let result = has_wildcard_fname(&path);
        assert!(result);
    }

    #[test]
    fn test_has_wildcard_fname_no_wildcard() {
        let path = PathBuf::from("path/to/file.json");
        let result = has_wildcard_fname(&path);
        assert!(!result);
    }

    #[test]
    fn test_build_models() {
        let specs = vec![
            PathBuf::from("tests/data/model.md"),
            PathBuf::from("tests/data/model_merge.md"),
        ];
        let result = build_models(&specs);
        assert!(result.is_ok());
    }

    #[test]
    fn test_prepend_root() {
        let mut gen_template = GenTemplate {
            meta: Meta {
                name: None,
                description: None,
                paths: vec![PathBuf::from("model.md")],
            },
            generate: HashMap::from_iter(vec![(
                "json-schema".to_string(),
                GenSpecs {
                    description: None,
                    out: PathBuf::from("schema.json"),
                    root: None,
                    per_spec: None,
                    config: HashMap::new(),
                    fname_case: None,
                },
            )]),
        };

        let path = PathBuf::from("tests/data");
        gen_template.prepend_root(&path);

        assert_eq!(
            gen_template.meta.paths[0],
            PathBuf::from("tests/data/model.md")
        );
        assert_eq!(
            gen_template.generate["json-schema"].out,
            PathBuf::from("tests/data/schema.json")
        );
    }
}