krik 0.1.27

mod recovery;

pub use recovery::{ErrorRecoverable, ErrorRecovery};

use std::fmt;
use std::path::PathBuf;
use thiserror::Error;

/// Result type alias for Krik operations  
/// Large error types are intentional for detailed error context
#[allow(clippy::result_large_err)]
pub type KrikResult<T> = Result<T, KrikError>;

/// Main error type for the Krik static site generator
#[derive(Debug, Error)]
pub enum KrikError {
    /// CLI argument and validation errors
    #[error(transparent)]
    Cli(#[from] Box<CliError>),
    /// Configuration-related errors
    #[error(transparent)]
    Config(#[from] Box<ConfigError>),
    /// File I/O errors
    #[error(transparent)]
    Io(#[from] Box<IoError>),
    /// Markdown parsing errors
    #[error(transparent)]
    Markdown(#[from] Box<MarkdownError>),
    /// Template processing errors
    #[error(transparent)]
    Template(#[from] Box<TemplateError>),
    /// Theme-related errors
    #[error(transparent)]
    Theme(#[from] Box<ThemeError>),
    /// Server-related errors
    #[error(transparent)]
    Server(#[from] Box<ServerError>),
    /// Content creation errors
    #[error(transparent)]
    Content(#[from] Box<ContentError>),
    /// Site generation errors
    #[error(transparent)]
    Generation(#[from] Box<GenerationError>),
}
/// CLI validation and argument parsing errors
#[derive(Debug)]
pub struct CliError {
    pub kind: CliErrorKind,
    pub path: Option<PathBuf>,
    pub context: String,
}

#[derive(Debug)]
pub enum CliErrorKind {
    /// Provided path does not exist
    PathDoesNotExist,
    /// Provided path exists but is not a directory
    NotADirectory,
    /// Permissions do not allow the requested operation
    PermissionDenied,
    /// Failed to create a directory
    CreateDirFailed(std::io::Error),
    /// Failed to canonicalize a path
    CanonicalizeFailed(std::io::Error),
    /// Invalid port number provided to the CLI
    InvalidPort(String),
    /// Theme directory not found or invalid
    ThemeNotFound,
}

/// Configuration file and parsing errors
#[derive(Debug)]
pub struct ConfigError {
    pub kind: ConfigErrorKind,
    pub path: Option<PathBuf>,
    pub context: String,
}

#[derive(Debug)]
pub enum ConfigErrorKind {
    /// Configuration file not found
    NotFound,
    /// Invalid TOML syntax
    InvalidToml(toml::de::Error),
    /// Invalid YAML syntax  
    InvalidYaml(serde_yaml::Error),
    /// Missing required field
    MissingField(String),
    /// Invalid field value
    InvalidValue {
        field: String,
        expected: String,
        found: String,
    },
    /// File permissions error
    PermissionDenied,
}

/// File I/O related errors
#[derive(Debug)]
pub struct IoError {
    pub kind: IoErrorKind,
    pub path: PathBuf,
    pub context: String,
}

#[derive(Debug)]
pub enum IoErrorKind {
    /// File or directory not found
    NotFound,
    /// Permission denied
    PermissionDenied,
    /// File already exists when it shouldn't
    AlreadyExists,
    /// Invalid file name or path
    InvalidPath,
    /// Disk full or write error
    WriteFailed(std::io::Error),
    /// Read operation failed
    ReadFailed(std::io::Error),
}

/// Markdown processing errors
#[derive(Debug)]
pub struct MarkdownError {
    pub kind: MarkdownErrorKind,
    pub file: PathBuf,
    pub line: Option<usize>,
    pub column: Option<usize>,
    pub context: String,
}

#[derive(Debug)]
pub enum MarkdownErrorKind {
    /// Invalid front matter YAML
    InvalidFrontMatter(serde_yaml::Error),
    /// Missing required front matter field
    MissingFrontMatterField(String),
    /// Invalid date format
    InvalidDate(String),
    /// Malformed markdown content
    ParseError(String),
    /// Invalid language code
    InvalidLanguage(String),
    /// Circular reference in content
    CircularReference(PathBuf),
}

/// Template processing errors
#[derive(Debug)]
pub struct TemplateError {
    pub kind: TemplateErrorKind,
    pub template: String,
    pub context: String,
}

#[derive(Debug)]
pub enum TemplateErrorKind {
    /// Template file not found
    NotFound,
    /// Template syntax error
    SyntaxError(tera::Error),
    /// Missing template variable
    MissingVariable(String),
    /// Template rendering failed
    RenderError(tera::Error),
    /// Template compilation failed
    CompileError(tera::Error),
}

/// Theme-related errors
#[derive(Debug)]
pub struct ThemeError {
    pub kind: ThemeErrorKind,
    pub theme_path: PathBuf,
    pub context: String,
}

#[derive(Debug)]
pub enum ThemeErrorKind {
    /// Theme directory not found
    NotFound,
    /// Invalid theme.toml configuration
    InvalidConfig(ConfigError),
    /// Missing required template
    MissingTemplate(String),
    /// Asset processing failed
    AssetError(String),
}

/// Development server errors
#[derive(Debug)]
pub struct ServerError {
    pub kind: ServerErrorKind,
    pub context: String,
}

#[derive(Debug)]
pub enum ServerErrorKind {
    /// Failed to bind to port
    BindError { port: u16, source: std::io::Error },
    /// File watching failed
    WatchError(notify::Error),
    /// WebSocket error
    WebSocketError(String),
    /// Live reload failed
    LiveReloadError(String),
}

/// Content creation and management errors
#[derive(Debug)]
pub struct ContentError {
    pub kind: ContentErrorKind,
    pub path: Option<PathBuf>,
    pub context: String,
}

#[derive(Debug)]
pub enum ContentErrorKind {
    /// Invalid content type
    InvalidType(String),
    /// Duplicate slug
    DuplicateSlug(String),
    /// Invalid file name
    InvalidFileName(String),
    /// Content validation failed
    ValidationFailed(Vec<String>),
}

/// Site generation errors
#[derive(Debug)]
pub struct GenerationError {
    pub kind: GenerationErrorKind,
    pub context: String,
}

#[derive(Debug)]
pub enum GenerationErrorKind {
    /// No content found to generate
    NoContent,
    /// Output directory creation failed
    OutputDirError(std::io::Error),
    /// Asset copying failed
    AssetCopyError {
        source: PathBuf,
        target: PathBuf,
        error: std::io::Error,
    },
    /// Feed generation failed
    FeedError(String),
    /// Sitemap generation failed
    SitemapError(String),
}

// Display implementations for user-friendly error messages (inner types)

impl fmt::Display for CliError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let path_str = self
            .path
            .as_ref()
            .map(|p| p.to_string_lossy().to_string())
            .unwrap_or_else(|| "<unknown>".to_string());

        match &self.kind {
            CliErrorKind::PathDoesNotExist => write!(
                f,
                "Path does not exist: {}\n  Context: {}\n  Suggestion: Create it with `mkdir -p {}` or double-check the --path argument",
                path_str, self.context, path_str
            ),
            CliErrorKind::NotADirectory => write!(
                f,
                "Not a directory: {}\n  Context: {}\n  Suggestion: Provide a directory path, not a file",
                path_str, self.context
            ),
            CliErrorKind::PermissionDenied => write!(
                f,
                "Permission denied for: {}\n  Context: {}\n  Suggestion: Check permissions or run with appropriate privileges",
                path_str, self.context
            ),
            CliErrorKind::CreateDirFailed(e) => write!(
                f,
                "Failed to create directory: {}\n  Error: {}\n  Context: {}\n  Suggestion: Ensure parent directory exists and you have write permissions",
                path_str, e, self.context
            ),
            CliErrorKind::CanonicalizeFailed(e) => write!(
                f,
                "Failed to resolve absolute path: {}\n  Error: {}\n  Context: {}\n  Suggestion: Ensure the path exists and is accessible",
                path_str, e, self.context
            ),
            CliErrorKind::InvalidPort(value) => write!(
                f,
                "Invalid port number: {}\n  Context: {}\n  Suggestion: Use a value between 1 and 65535 (e.g., --port 3000)",
                value, self.context
            ),
            CliErrorKind::ThemeNotFound => write!(
                f,
                "Theme directory not found: {}\n  Context: {}\n  Suggestion: Ensure the theme exists or run `kk init` to install the default theme",
                path_str, self.context
            ),
        }
    }
}

impl fmt::Display for ConfigError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let path_str = self
            .path
            .as_ref()
            .map(|p| p.to_string_lossy().to_string())
            .unwrap_or_else(|| "<unknown>".to_string());

        match &self.kind {
            ConfigErrorKind::NotFound => {
                write!(f, "Configuration file not found: {path_str}")
            }
            ConfigErrorKind::InvalidToml(e) => {
                write!(
                    f,
                    "Invalid TOML in {}: {}\n  Context: {}",
                    path_str, e, self.context
                )
            }
            ConfigErrorKind::InvalidYaml(e) => {
                write!(
                    f,
                    "Invalid YAML in {}: {}\n  Context: {}",
                    path_str, e, self.context
                )
            }
            ConfigErrorKind::MissingField(field) => {
                write!(
                    f,
                    "Missing required field '{}' in {}\n  Context: {}",
                    field, path_str, self.context
                )
            }
            ConfigErrorKind::InvalidValue {
                field,
                expected,
                found,
            } => {
                write!(f, "Invalid value for field '{}' in {}\n  Expected: {}\n  Found: {}\n  Context: {}", 
                       field, path_str, expected, found, self.context)
            }
            ConfigErrorKind::PermissionDenied => {
                write!(
                    f,
                    "Permission denied accessing configuration file: {path_str}"
                )
            }
        }
    }
}

impl fmt::Display for IoError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let path_str = self.path.to_string_lossy();

        match &self.kind {
            IoErrorKind::NotFound => {
                write!(
                    f,
                    "File or directory not found: {}\n  Context: {}",
                    path_str, self.context
                )
            }
            IoErrorKind::PermissionDenied => {
                write!(
                    f,
                    "Permission denied: {}\n  Context: {}",
                    path_str, self.context
                )
            }
            IoErrorKind::AlreadyExists => {
                write!(
                    f,
                    "File already exists: {}\n  Context: {}",
                    path_str, self.context
                )
            }
            IoErrorKind::InvalidPath => {
                write!(
                    f,
                    "Invalid file path: {}\n  Context: {}",
                    path_str, self.context
                )
            }
            IoErrorKind::WriteFailed(e) => {
                write!(
                    f,
                    "Failed to write file: {}\n  Error: {}\n  Context: {}",
                    path_str, e, self.context
                )
            }
            IoErrorKind::ReadFailed(e) => {
                write!(
                    f,
                    "Failed to read file: {}\n  Error: {}\n  Context: {}",
                    path_str, e, self.context
                )
            }
        }
    }
}

impl fmt::Display for MarkdownError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let file_str = self.file.to_string_lossy();
        let location = match (self.line, self.column) {
            (Some(line), Some(col)) => format!(" at line {line}, column {col}"),
            (Some(line), None) => format!(" at line {line}"),
            _ => String::new(),
        };

        match &self.kind {
            MarkdownErrorKind::InvalidFrontMatter(e) => {
                write!(
                    f,
                    "Invalid front matter in {}{}\n  Error: {}\n  Context: {}",
                    file_str, location, e, self.context
                )
            }
            MarkdownErrorKind::MissingFrontMatterField(field) => {
                write!(
                    f,
                    "Missing required front matter field '{}' in {}{}\n  Context: {}",
                    field, file_str, location, self.context
                )
            }
            MarkdownErrorKind::InvalidDate(date) => {
                write!(f, "Invalid date format '{}' in {}{}\n  Expected ISO 8601 format (e.g., 2024-01-15T10:30:00Z)\n  Context: {}", 
                       date, file_str, location, self.context)
            }
            MarkdownErrorKind::ParseError(msg) => {
                write!(
                    f,
                    "Markdown parsing error in {}{}\n  Error: {}\n  Context: {}",
                    file_str, location, msg, self.context
                )
            }
            MarkdownErrorKind::InvalidLanguage(lang) => {
                write!(f, "Invalid language code '{}' in {}{}\n  Supported languages: en, it, es, fr, de, pt, ja, zh, ru, ar\n  Context: {}", 
                       lang, file_str, location, self.context)
            }
            MarkdownErrorKind::CircularReference(ref_path) => {
                write!(
                    f,
                    "Circular reference detected: {} references {}\n  Context: {}",
                    file_str,
                    ref_path.to_string_lossy(),
                    self.context
                )
            }
        }
    }
}

impl fmt::Display for TemplateError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match &self.kind {
            TemplateErrorKind::NotFound => {
                write!(
                    f,
                    "Template not found: {}\n  Context: {}",
                    self.template, self.context
                )
            }
            TemplateErrorKind::SyntaxError(e) => {
                write!(
                    f,
                    "Template syntax error in {}\n  Error: {}\n  Context: {}",
                    self.template, e, self.context
                )
            }
            TemplateErrorKind::MissingVariable(var) => {
                write!(
                    f,
                    "Missing template variable '{}' in {}\n  Context: {}",
                    var, self.template, self.context
                )
            }
            TemplateErrorKind::RenderError(e) => {
                write!(
                    f,
                    "Template rendering failed for {}\n  Error: {}\n  Context: {}",
                    self.template, e, self.context
                )
            }
            TemplateErrorKind::CompileError(e) => {
                write!(
                    f,
                    "Template compilation failed for {}\n  Error: {}\n  Context: {}",
                    self.template, e, self.context
                )
            }
        }
    }
}

impl fmt::Display for ThemeError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let theme_str = self.theme_path.to_string_lossy();

        match &self.kind {
            ThemeErrorKind::NotFound => {
                write!(
                    f,
                    "Theme not found: {}\n  Context: {}",
                    theme_str, self.context
                )
            }
            ThemeErrorKind::InvalidConfig(e) => {
                write!(
                    f,
                    "Invalid theme configuration in {}\n  Error: {}\n  Context: {}",
                    theme_str, e, self.context
                )
            }
            ThemeErrorKind::MissingTemplate(template) => {
                write!(
                    f,
                    "Missing required template '{}' in theme {}\n  Context: {}",
                    template, theme_str, self.context
                )
            }
            ThemeErrorKind::AssetError(msg) => {
                write!(
                    f,
                    "Asset processing error in theme {}\n  Error: {}\n  Context: {}",
                    theme_str, msg, self.context
                )
            }
        }
    }
}

impl fmt::Display for ServerError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match &self.kind {
            ServerErrorKind::BindError { port, source } => {
                write!(f, "Failed to bind to port {}\n  Error: {}\n  Context: {}\n  Suggestion: Try a different port with --port <PORT>", 
                       port, source, self.context)
            }
            ServerErrorKind::WatchError(e) => {
                write!(
                    f,
                    "File watching failed\n  Error: {}\n  Context: {}",
                    e, self.context
                )
            }
            ServerErrorKind::WebSocketError(msg) => {
                write!(f, "WebSocket error: {}\n  Context: {}", msg, self.context)
            }
            ServerErrorKind::LiveReloadError(msg) => {
                write!(
                    f,
                    "Live reload error: {}\n  Context: {}\n  Suggestion: Try --no-live-reload flag",
                    msg, self.context
                )
            }
        }
    }
}

impl fmt::Display for ContentError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        let path_str = self
            .path
            .as_ref()
            .map(|p| p.to_string_lossy().to_string())
            .unwrap_or_else(|| "<unknown>".to_string());

        match &self.kind {
            ContentErrorKind::InvalidType(content_type) => {
                write!(
                    f,
                    "Invalid content type '{}' for {}\n  Context: {}",
                    content_type, path_str, self.context
                )
            }
            ContentErrorKind::DuplicateSlug(slug) => {
                write!(
                    f,
                    "Duplicate slug '{}' found\n  Path: {}\n  Context: {}",
                    slug, path_str, self.context
                )
            }
            ContentErrorKind::InvalidFileName(filename) => {
                write!(f, "Invalid file name '{}'\n  Context: {}\n  Suggestion: Use alphanumeric characters, hyphens, and underscores only", 
                       filename, self.context)
            }
            ContentErrorKind::ValidationFailed(errors) => {
                write!(f, "Content validation failed for {path_str}\n  Issues:\n")?;
                for error in errors {
                    writeln!(f, "    - {error}")?;
                }
                write!(f, "  Context: {}", self.context)
            }
        }
    }
}

impl fmt::Display for GenerationError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match &self.kind {
            GenerationErrorKind::NoContent => {
                write!(f, "No content found to generate\n  Context: {}\n  Suggestion: Add .md files to your content directory", 
                       self.context)
            }
            GenerationErrorKind::OutputDirError(e) => {
                write!(
                    f,
                    "Failed to create output directory\n  Error: {}\n  Context: {}",
                    e, self.context
                )
            }
            GenerationErrorKind::AssetCopyError {
                source,
                target,
                error,
            } => {
                write!(
                    f,
                    "Failed to copy asset\n  From: {}\n  To: {}\n  Error: {}\n  Context: {}",
                    source.to_string_lossy(),
                    target.to_string_lossy(),
                    error,
                    self.context
                )
            }
            GenerationErrorKind::FeedError(msg) => {
                write!(
                    f,
                    "Feed generation failed\n  Error: {}\n  Context: {}",
                    msg, self.context
                )
            }
            GenerationErrorKind::SitemapError(msg) => {
                write!(
                    f,
                    "Sitemap generation failed\n  Error: {}\n  Context: {}",
                    msg, self.context
                )
            }
        }
    }
}

// Standard Error trait implementations

impl std::error::Error for CliError {}
impl std::error::Error for ConfigError {}
impl std::error::Error for IoError {}
impl std::error::Error for MarkdownError {}
impl std::error::Error for TemplateError {}
impl std::error::Error for ThemeError {}
impl std::error::Error for ServerError {}
impl std::error::Error for ContentError {}
impl std::error::Error for GenerationError {}

// Conversion implementations from external error types

impl From<std::io::Error> for KrikError {
    fn from(e: std::io::Error) -> Self {
        KrikError::Io(Box::new(IoError {
            kind: match e.kind() {
                std::io::ErrorKind::NotFound => IoErrorKind::NotFound,
                std::io::ErrorKind::PermissionDenied => IoErrorKind::PermissionDenied,
                std::io::ErrorKind::AlreadyExists => IoErrorKind::AlreadyExists,
                _ => IoErrorKind::ReadFailed(e),
            },
            path: PathBuf::new(), // Will be set by context
            context: "I/O operation".to_string(),
        }))
    }
}

impl From<toml::de::Error> for KrikError {
    fn from(e: toml::de::Error) -> Self {
        KrikError::Config(Box::new(ConfigError {
            kind: ConfigErrorKind::InvalidToml(e),
            path: None,
            context: "TOML parsing".to_string(),
        }))
    }
}

impl From<serde_yaml::Error> for KrikError {
    fn from(e: serde_yaml::Error) -> Self {
        KrikError::Config(Box::new(ConfigError {
            kind: ConfigErrorKind::InvalidYaml(e),
            path: None,
            context: "YAML parsing".to_string(),
        }))
    }
}

impl From<tera::Error> for KrikError {
    fn from(e: tera::Error) -> Self {
        KrikError::Template(Box::new(TemplateError {
            kind: TemplateErrorKind::RenderError(e),
            template: "<unknown>".to_string(),
            context: "Template processing".to_string(),
        }))
    }
}

// Helper macros for creating contextual errors

/// Create a context-aware I/O error
#[macro_export]
macro_rules! io_error {
    ($kind:expr, $path:expr, $context:expr) => {
        $crate::error::KrikError::Io(Box::new($crate::error::IoError {
            kind: $kind,
            path: $path.into(),
            context: $context.to_string(),
        }))
    };
}

/// Create a context-aware markdown error
#[macro_export]
macro_rules! markdown_error {
    ($kind:expr, $file:expr, $context:expr) => {
        $crate::error::KrikError::Markdown(Box::new($crate::error::MarkdownError {
            kind: $kind,
            file: $file.into(),
            line: None,
            column: None,
            context: $context.to_string(),
        }))
    };
    ($kind:expr, $file:expr, $line:expr, $context:expr) => {
        $crate::error::KrikError::Markdown(Box::new($crate::error::MarkdownError {
            kind: $kind,
            file: $file.into(),
            line: Some($line),
            column: None,
            context: $context.to_string(),
        }))
    };
}

/// Create a context-aware template error
#[macro_export]
macro_rules! template_error {
    ($kind:expr, $template:expr, $context:expr) => {
        $crate::error::KrikError::Template(Box::new($crate::error::TemplateError {
            kind: $kind,
            template: $template.to_string(),
            context: $context.to_string(),
        }))
    };
}

/// Create a context-aware config error
#[macro_export]
macro_rules! config_error {
    ($kind:expr, $path:expr, $context:expr) => {
        $crate::error::KrikError::Config(Box::new($crate::error::ConfigError {
            kind: $kind,
            path: Some($path.into()),
            context: $context.to_string(),
        }))
    };
}