#!/usr/bin/env nu

# Enhanced Content Build Script (Nushell)
# Uses the Rust content_processor with library functions for modularity

# Import modular library functions
use lib/frontmatter.nu *

# Load environment variables from .env file
def load_env_from_file [] {
    let env_file = ".env"
    if ($env_file | path exists) {
        let env_content = (open $env_file | lines)
        for line in $env_content {
            # Skip comments and empty lines
            if not ($line | str trim | str starts-with "#") and not ($line | str trim | is-empty) {
                # Parse KEY=VALUE format with variable expansion
                if ($line | str contains "=") {
                    let parts = ($line | split column "=" key value)
                    if ($parts | length) >= 2 {
                        let key = ($parts | first | get key | str trim)
                        let value = ($parts | first | get value | str trim)
                        # Remove quotes and expand ${VARIABLE} patterns
                        let clean_value = ($value | str replace -a '"' '' | str replace -a "'" '')
                        let expanded_value = expand_env_variables $clean_value
                        # Set environment variable
                        load-env {($key): $expanded_value}
                    }
                }
            }
        }
    }
}

# Expand ${VARIABLE} patterns in environment values
def expand_env_variables [value: string] {
    # Simplified expansion for common patterns
    mut result = $value

    # Replace ${SITE_ROOT_PATH} with actual value
    if ($result | str contains '${SITE_ROOT_PATH}') {
        let site_root = try { $env.SITE_ROOT_PATH } catch { "." }
        $result = ($result | str replace -a '${SITE_ROOT_PATH}' $site_root)
    }

    $result
}

# Get environment variable with default
def get_env_var [var_name: string, default_value: string] {
    try {
        $env | get $var_name
    } catch {
        $default_value
    }
}

# Get enabled content types from content-kinds.toml
def get_enabled_content_types [content_dir: string] {
    let content_kinds_file = $"($content_dir)/content-kinds.toml"

    if not ($content_kinds_file | path exists) {
        print $"(ansi yellow)⚠️  Warning: content-kinds.toml not found, using defaults(ansi reset)"
        return ["blog", "recipes"]
    }

    mut enabled_types = []
    let toml_content = open $content_kinds_file

    if "content_kinds" in $toml_content {
        for kind in $toml_content.content_kinds {
            if $kind.enabled {
                $enabled_types = ($enabled_types | append $kind.name)
            }
        }
    }

    if ($enabled_types | length) == 0 {
        ["blog", "recipes"]
    } else {
        $enabled_types
    }
}

# Show comprehensive help information
def show_help [] {
    print $"
(ansi blue)Enhanced Content Build Script(ansi reset)
Uses the Rust content_processor for fast, reliable content generation

(ansi green)USAGE:(ansi reset)
  ./build-content-enhanced.nu [OPTIONS]

(ansi green)OPTIONS:(ansi reset)
  -h, --help                Show this help message
  -t, --content-type TYPE   Process specific content type only
  -l, --language LANG       Process specific language only
  -c, --category CATEGORY   Process specific category only
  -f, --file FILE           Process specific file with glob pattern support
  -w, --watch               Watch for changes and auto-regenerate
  --clean                   Clean output directory before building
  --copy-to-server          Copy generated content to server runtime directory
  --stats                   Show content statistics after build
  --use-legacy              Use legacy Nushell processor instead of Rust

(ansi green)EXAMPLES:(ansi reset)

  # Build all content
  ./build-content-enhanced.nu

  # Build only blog content
  ./build-content-enhanced.nu --content-type blog

  # Build only English blog content
  ./build-content-enhanced.nu --content-type blog --language en

  # Build only rust category posts
  ./build-content-enhanced.nu --content-type blog --language en --category rust

  # Build specific file
  ./build-content-enhanced.nu --file \"blog/en/rust/rust-web-development-2024.md\"

  # Build multiple files with pattern
  ./build-content-enhanced.nu --file \"blog/en/*/rust-*.md\"

  # Clean build with server copy and stats
  ./build-content-enhanced.nu --clean --copy-to-server --stats

  # Watch mode for development
  ./build-content-enhanced.nu --watch

(ansi green)ENVIRONMENT VARIABLES:(ansi reset)
  SITE_CONTENT_PATH         Source content directory (default: site/content)
  SITE_PUBLIC_PATH          Output directory (default: site/public)
  SITE_SERVER_CONTENT_ROOT  Server runtime directory (default: r)

(ansi green)GENERATED FILES:(ansi reset)
  post-name.html           Markdown content converted to HTML
  post-name.json           Frontmatter data in JSON format
  index.json              Collection index with all posts and metadata

(ansi yellow)NOTES:(ansi reset)
  - Recommended replacement for build-localized-content.nu
  - Uses fast Rust content_processor by default
  - All processing options respect project language-agnostic architecture
  - No hardcoded paths, categories, or content types
  - Automatically discovers content from configuration files
  - Hot reload ready for development workflows
"
}

# Build cargo command for content processor
def build_rust_processor_command [
    content_type?: string
    language?: string
    category?: string
    file?: string
    watch: bool = false
] {
    mut cmd = ["cargo", "run", "--features=content-static", "--package", "rustelo-htmx-server", "--bin", "content_processor", "--"]

    if $content_type != null {
        $cmd = ($cmd | append ["--content-type", $content_type])
    }

    if $language != null {
        $cmd = ($cmd | append ["--language", $language])
    }

    if $category != null {
        $cmd = ($cmd | append ["--category", $category])
    }

    if $file != null {
        $cmd = ($cmd | append ["--file", $file])
    }

    if $watch {
        $cmd = ($cmd | append ["--watch"])
    }

    $cmd
}

# Run the Rust content processor
def run_rust_processor [
    content_type?: string
    language?: string
    category?: string
    file?: string
    watch: bool = false
] {
    mut cmd_args = []

    if $content_type != null {
        $cmd_args = ($cmd_args | append ["--content-type", $content_type])
    }

    if $language != null {
        $cmd_args = ($cmd_args | append ["--language", $language])
    }

    if $category != null {
        $cmd_args = ($cmd_args | append ["--category", $category])
    }

    if $file != null {
        $cmd_args = ($cmd_args | append ["--file", $file])
    }

    if $watch {
        $cmd_args = ($cmd_args | append ["--watch"])
    }

    print $"(ansi blue)🔧 Running cargo with args: ($cmd_args | str join ' ')(ansi reset)"

    try {
        if ($cmd_args | length) > 0 {
            run-external "cargo" "run" "--features=content-static" "--package" "rustelo-htmx-server" "--bin" "content_processor" "--" ...$cmd_args
        } else {
            run-external "cargo" "run" "--features=content-static" "--package" "rustelo-htmx-server" "--bin" "content_processor"
        }
        print $"(ansi green)✅ Content processing completed!(ansi reset)"
        true
    } catch { |err|
        print $"(ansi red)❌ Content processing failed: ($err.msg)(ansi reset)"
        false
    }
}

# Copy generated content to server runtime directory
def copy_to_server_directory [public_dir: string, server_dir: string] {
    print $"(ansi blue)📋 Copying content to server runtime directory...(ansi reset)"
    print $"(ansi blue)   From: ($public_dir)(ansi reset)"
    print $"(ansi blue)   To: ($server_dir)(ansi reset)"

    # Create server directory if it doesn't exist
    mkdir $server_dir

    # Copy all content
    if ($public_dir | path exists) {
        try {
            cp -r ($public_dir | path join "*") $server_dir
            print $"(ansi green)✅ Content copied to server directory(ansi reset)"
        } catch { |err|
            print $"(ansi yellow)⚠️  Warning: Could not copy some files: ($err.msg)(ansi reset)"
        }
    } else {
        print $"(ansi yellow)⚠️  Warning: Public directory does not exist: ($public_dir)(ansi reset)"
    }
}

# Show content statistics using library functions
def show_enhanced_content_statistics [output_dir: string] {
    print $"(ansi blue)📊 Enhanced Content Statistics:(ansi reset)"

    if not ($output_dir | path exists) {
        print $"(ansi yellow)⚠️  Output directory does not exist: ($output_dir)(ansi reset)"
        return
    }

    # Count generated files by type
    let html_files = (glob ($output_dir | path join "**/*.html") | length)
    let json_files = (glob ($output_dir | path join "**/*.json") | length)
    let index_files = (glob ($output_dir | path join "**/index.json") | length)

    print $"  HTML files: ($html_files)"
    print $"  JSON files: ($json_files)"
    print $"  Index files: ($index_files)"

    # Show directory structure using library function if available
    print $"(ansi blue)📁 Generated Structure:(ansi reset)"
    try {
        ls $output_dir | where type == "dir" | each { |item|
            let dir_name = ($item.name | path basename)
            print $"  📁 ($dir_name)/"

            # Show subdirectories
            try {
                ls $item.name | where type == "dir" | each { |subitem|
                    let subdir_name = ($subitem.name | path basename)
                    let post_count = (glob ($subitem.name | path join "*.md") | length)
                    print $"    📂 ($subdir_name)/ - ($post_count) posts"
                } | ignore
            } catch {
                # Ignore errors accessing subdirectories
            }
        } | ignore
    } catch {
        print $"  Structure listing not available"
    }
}

# Main function with comprehensive options
def main [
    --help(-h)                    # Show help message
    --content-type(-t): string    # Process specific content type only
    --language(-l): string        # Process specific language only
    --category(-c): string        # Process specific category only
    --file(-f): string            # Process specific file with glob support
    --watch(-w)                   # Watch for changes and auto-regenerate
    --clean                       # Clean output directory before building
    --copy-to-server              # Copy generated content to server runtime directory
    --stats                       # Show content statistics after build
    --use-legacy                  # Use legacy Nushell processor instead of Rust
] {
    # Show help if requested
    if $help {
        show_help
        return
    }

    # Load environment variables using library function
    load_env_from_file

    # Configuration from environment using library function
    let content_dir = (get_env_var "SITE_CONTENT_PATH" "site/content")
    let public_dir = (get_env_var "SITE_PUBLIC_PATH" "site/public")
    let server_dir = (get_env_var "SITE_SERVER_ROOT_CONTENT" "r")
    let out_dir_path = ($public_dir | path join $server_dir)

    print $"(ansi blue)🚀 Enhanced Content Build System(ansi reset)"
    print $"(ansi blue)📁 Source: ($content_dir)(ansi reset)"
    print $"(ansi blue)📂 Output: ($out_dir_path(ansi reset)"


    # Clean output directory if requested
    if $clean {
        if ($out_dir_path | path exists) {
            print $"(ansi yellow)🧹 Cleaning output directory: ($out_dir_path)(ansi reset)"
            rm -rf $out_dir_path
        }
        mkdir $out_dir_path
    }

    # Use Rust content processor only
    if $use_legacy {
        print $"(ansi red)❌ Legacy Nushell processor is not supported(ansi reset)"
        print $"(ansi yellow)💡 Please use the Rust content processor for reliable content processing(ansi reset)"
        return
    }

    # Use the Rust content processor (only supported method)
    print $"(ansi blue)🚀 Using Rust content processor...(ansi reset)"

    let success = (run_rust_processor $content_type $language $category $file $watch)

    if not $success {
        print $"(ansi red)❌ Build failed!(ansi reset)"
        return
    }

    # Copy to server directory if requested
    if $copy_to_server {
        copy_to_server_directory $public_dir $server_dir
    }

    # Show statistics if requested
    if $stats {
        show_enhanced_content_statistics $public_dir
    }

    # Show completion message
    if $watch {
        print $"(ansi yellow)👀 Watch mode active - monitoring for changes...(ansi reset)"
        print $"(ansi yellow)Press Ctrl+C to stop watching(ansi reset)"
    } else {
        print $"(ansi green)🎉 Content build complete!(ansi reset)"
        print $"(ansi green)   Generated files in: ($out_dir_path)(ansi reset)"
        if $copy_to_server {
            print $"(ansi green)   Server files in: ($server_dir)(ansi reset)"
        }
    }
}