use clap::{Parser, Subcommand};
use anyhow::Result;
use archdoc_core::{Config, ProjectModel, scanner::FileScanner, python_analyzer::PythonAnalyzer};
use std::path::Path;

/// CLI interface for ArchDoc
#[derive(Parser)]
#[command(name = "archdoc")]
#[command(about = "Generate architecture documentation for Python projects")]
#[command(version = "0.1.0")]
pub struct Cli {
    #[command(subcommand)]
    command: Commands,
    
    /// Verbose output
    #[arg(short, long, global = true)]
    verbose: bool,
}

#[derive(Subcommand)]
enum Commands {
    /// Initialize archdoc in the project
    Init {
        /// Project root directory
        #[arg(short, long, default_value = ".")]
        root: String,
        
        /// Output directory for documentation
        #[arg(short, long, default_value = "docs/architecture")]
        out: String,
    },
    
    /// Generate or update documentation
    Generate {
        /// Project root directory
        #[arg(short, long, default_value = ".")]
        root: String,
        
        /// Output directory for documentation
        #[arg(short, long, default_value = "docs/architecture")]
        out: String,
        
        /// Configuration file path
        #[arg(short, long, default_value = "archdoc.toml")]
        config: String,
    },
    
    /// Check if documentation is up to date
    Check {
        /// Project root directory
        #[arg(short, long, default_value = ".")]
        root: String,
        
        /// Configuration file path
        #[arg(short, long, default_value = "archdoc.toml")]
        config: String,
    },
}

fn main() -> Result<()> {
    let cli = Cli::parse();
    
    // Setup logging based on verbose flag
    setup_logging(cli.verbose)?;
    
    match &cli.command {
        Commands::Init { root, out } => {
            init_project(root, out)?;
        }
        Commands::Generate { root, out, config } => {
            let config = load_config(config)?;
            let model = analyze_project(root, &config)?;
            generate_docs(&model, out)?;
        }
        Commands::Check { root, config } => {
            let config = load_config(config)?;
            check_docs_consistency(root, &config)?;
        }
    }
    
    Ok(())
}

fn setup_logging(verbose: bool) -> Result<()> {
    // TODO: Implement logging setup
    println!("Setting up logging with verbose={}", verbose);
    Ok(())
}

fn init_project(root: &str, out: &str) -> Result<()> {
    // TODO: Implement project initialization
    println!("Initializing project at {} with output to {}", root, out);
    
    // Create output directory
    let out_path = std::path::Path::new(out);
    std::fs::create_dir_all(out_path)
        .map_err(|e| anyhow::anyhow!("Failed to create output directory: {}", e))?;
    
    // Create docs/architecture directory structure
    let docs_arch_path = out_path.join("docs").join("architecture");
    std::fs::create_dir_all(&docs_arch_path)
        .map_err(|e| anyhow::anyhow!("Failed to create docs/architecture directory: {}", e))?;
    
    // Create modules and files directories
    std::fs::create_dir_all(docs_arch_path.join("modules"))
        .map_err(|e| anyhow::anyhow!("Failed to create modules directory: {}", e))?;
    std::fs::create_dir_all(docs_arch_path.join("files"))
        .map_err(|e| anyhow::anyhow!("Failed to create files directory: {}", e))?;
    
    // Create default ARCHITECTURE.md template
    let architecture_md_content = r#"# ARCHITECTURE — New Project

<!-- MANUAL:BEGIN -->
## Project summary
**Name:** New Project
**Description:** <FILL_MANUALLY: what this project does in 3–7 lines>

## Key decisions (manual)
- <FILL_MANUALLY>

## Non-goals (manual)
- <FILL_MANUALLY>
<!-- MANUAL:END -->

---

## Document metadata
- **Created:** 2026-01-25
- **Updated:** 2026-01-25
- **Generated by:** archdoc (cli) v0.1

---

## Rails / Tooling
<!-- ARCHDOC:BEGIN section=rails -->
> Generated. Do not edit inside this block.

<!-- ARCHDOC:END section=rails -->

---

## Repository layout (top-level)
<!-- ARCHDOC:BEGIN section=layout -->
> Generated. Do not edit inside this block.

<!-- ARCHDOC:END section=layout -->

---

## Modules index
<!-- ARCHDOC:BEGIN section=modules_index -->
> Generated. Do not edit inside this block.

<!-- ARCHDOC:END section=modules_index -->

---

## Critical dependency points
<!-- ARCHDOC:BEGIN section=critical_points -->
> Generated. Do not edit inside this block.

<!-- ARCHDOC:END section=critical_points -->

---

<!-- MANUAL:BEGIN -->
## Change notes (manual)
- <FILL_MANUALLY>
<!-- MANUAL:END -->
"#;
    
    let architecture_md_path = std::path::Path::new(root).join("ARCHITECTURE.md");
    std::fs::write(&architecture_md_path, architecture_md_content)
        .map_err(|e| anyhow::anyhow!("Failed to create ARCHITECTURE.md: {}", e))?;
    
    // Create default archdoc.toml config
    let config_toml_content = r#"[project]
root = "."
out_dir = "docs/architecture"
entry_file = "ARCHITECTURE.md"
language = "python"

[scan]
include = ["src", "app", "tests"]
exclude = [
    ".venv", "venv", "__pycache__", ".git", "dist", "build",
    ".mypy_cache", ".ruff_cache", ".pytest_cache", "*.egg-info"
]
follow_symlinks = false
max_file_size = "10MB"

[python]
src_roots = ["src", "."]
include_tests = true
parse_docstrings = true
max_parse_errors = 10

[analysis]
resolve_calls = true
resolve_inheritance = false
detect_integrations = true
integration_patterns = [
    { type = "http", patterns = ["requests", "httpx", "aiohttp"] },
    { type = "db", patterns = ["sqlalchemy", "psycopg", "mysql", "sqlite3"] },
    { type = "queue", patterns = ["celery", "kafka", "pika", "redis"] }
]

[output]
single_file = false
per_file_docs = true
create_directories = true
overwrite_manual_sections = false

[diff]
update_timestamp_on_change_only = true
hash_algorithm = "sha256"
preserve_manual_content = true

[thresholds]
critical_fan_in = 20
critical_fan_out = 20
high_complexity = 50

[rendering]
template_engine = "handlebars"
max_table_rows = 100
truncate_long_descriptions = true
description_max_length = 200

[logging]
level = "info"
file = "archdoc.log"
format = "compact"

[caching]
enabled = true
cache_dir = ".archdoc/cache"
max_cache_age = "24h"
"#;
    
    let config_toml_path = std::path::Path::new(root).join("archdoc.toml");
    if !config_toml_path.exists() {
        std::fs::write(&config_toml_path, config_toml_content)
            .map_err(|e| anyhow::anyhow!("Failed to create archdoc.toml: {}", e))?;
    }
    
    println!("Project initialized successfully!");
    println!("Created:");
    println!("  - {}", architecture_md_path.display());
    println!("  - {}", config_toml_path.display());
    println!("  - {} (directory structure)", docs_arch_path.display());
    
    Ok(())
}

fn load_config(config_path: &str) -> Result<Config> {
    // TODO: Implement config loading
    println!("Loading config from {}", config_path);
    Config::load_from_file(Path::new(config_path))
        .map_err(|e| anyhow::anyhow!("Failed to load config: {}", e))
}

fn analyze_project(root: &str, config: &Config) -> Result<ProjectModel> {
    // TODO: Implement project analysis
    println!("Analyzing project at {} with config", root);
    
    // Initialize scanner
    let scanner = FileScanner::new(config.clone());
    
    // Scan for Python files
    let python_files = scanner.scan_python_files(std::path::Path::new(root))?;
    
    // Initialize Python analyzer
    let analyzer = PythonAnalyzer::new(config.clone());
    
    // Parse each Python file
    let mut parsed_modules = Vec::new();
    for file_path in python_files {
        match analyzer.parse_module(&file_path) {
            Ok(module) => parsed_modules.push(module),
            Err(e) => {
                eprintln!("Warning: Failed to parse {}: {}", file_path.display(), e);
                // Continue with other files
            }
        }
    }
    
    // Resolve symbols and build project model
    analyzer.resolve_symbols(&parsed_modules)
        .map_err(|e| anyhow::anyhow!("Failed to resolve symbols: {}", e))
}

fn generate_docs(model: &ProjectModel, out: &str) -> Result<()> {
    // TODO: Implement documentation generation
    println!("Generating docs to {}", out);
    
    // Initialize renderer
    let renderer = archdoc_core::renderer::Renderer::new();
    
    // Initialize writer
    let writer = archdoc_core::writer::DiffAwareWriter::new();
    
    // Write to file - ARCHITECTURE.md should be in the project root, not output directory
    // The out parameter is for the docs/architecture directory structure
    let output_path = std::path::Path::new(".").join("ARCHITECTURE.md");
    
    // Render and update each section individually
    
    // Update integrations section
    match renderer.render_integrations_section(model) {
        Ok(content) => {
            if let Err(e) = writer.update_file_with_markers(&output_path, &content, "integrations") {
                eprintln!("Warning: Failed to update integrations section: {}", e);
            }
        }
        Err(e) => {
            eprintln!("Warning: Failed to render integrations section: {}", e);
        }
    }
    
    // Update rails section
    match renderer.render_rails_section(model) {
        Ok(content) => {
            if let Err(e) = writer.update_file_with_markers(&output_path, &content, "rails") {
                eprintln!("Warning: Failed to update rails section: {}", e);
            }
        }
        Err(e) => {
            eprintln!("Warning: Failed to render rails section: {}", e);
        }
    }
    
    // Update layout section
    match renderer.render_layout_section(model) {
        Ok(content) => {
            if let Err(e) = writer.update_file_with_markers(&output_path, &content, "layout") {
                eprintln!("Warning: Failed to update layout section: {}", e);
            }
        }
        Err(e) => {
            eprintln!("Warning: Failed to render layout section: {}", e);
        }
    }
    
    // Update modules index section
    match renderer.render_modules_index_section(model) {
        Ok(content) => {
            if let Err(e) = writer.update_file_with_markers(&output_path, &content, "modules_index") {
                eprintln!("Warning: Failed to update modules_index section: {}", e);
            }
        }
        Err(e) => {
            eprintln!("Warning: Failed to render modules_index section: {}", e);
        }
    }
    
    // Update critical points section
    match renderer.render_critical_points_section(model) {
        Ok(content) => {
            if let Err(e) = writer.update_file_with_markers(&output_path, &content, "critical_points") {
                eprintln!("Warning: Failed to update critical_points section: {}", e);
            }
        }
        Err(e) => {
            eprintln!("Warning: Failed to render critical_points section: {}", e);
        }
    }
    
    Ok(())
}

fn check_docs_consistency(root: &str, config: &Config) -> Result<()> {
    // TODO: Implement consistency checking
    println!("Checking docs consistency for project at {} with config", root);
    
    // Analyze project
    let model = analyze_project(root, config)?;
    
    // Generate documentation content - if this succeeds, the analysis is working
    let renderer = archdoc_core::renderer::Renderer::new();
    let generated_architecture_md = renderer.render_architecture_md(&model)?;
    
    // Read existing documentation
    let architecture_md_path = std::path::Path::new(root).join(&config.project.entry_file);
    if !architecture_md_path.exists() {
        return Err(anyhow::anyhow!("Documentation file {} does not exist", architecture_md_path.display()));
    }
    
    let existing_architecture_md = std::fs::read_to_string(&architecture_md_path)
        .map_err(|e| anyhow::anyhow!("Failed to read {}: {}", architecture_md_path.display(), e))?;
    
    // For V1, we'll just check that we can generate content without errors
    // A full implementation would compare only the generated sections
    println!("Documentation analysis successful - project can be documented");
    println!("Generated content length: {}", generated_architecture_md.len());
    println!("Existing content length: {}", existing_architecture_md.len());
    
    Ok(())
}