#!/usr/bin/env node
// Smart Roadmap CLI
// Command Line Interface for Smart Roadmap Scanner
// Version: 1.0.0

const SmartRoadmapScanner = require('./src/index');
const path = require('path');
const fs = require('fs');

// Parse command line arguments
function parseArguments(args) {
    const options = {
        command: 'scan',
        projectPath: process.cwd(),
        verbose: false,
        dryRun: false,
        outputDir: 'docs',
        format: 'all',
        help: false,
        version: false
    };

    const validCommands = ['scan', 'analyze', 'help'];
    let commandFound = false;

    for (let i = 0; i < args.length; i++) {
        const arg = args[i];

        if (arg === '-h' || arg === '--help') {
            options.help = true;
        } else if (arg === '--version') {
            options.version = true;
        } else if (arg === '-v' || arg === '--verbose') {
            options.verbose = true;
        } else if (arg === '-d' || arg === '--dry-run') {
            options.dryRun = true;
        } else if (arg === '-o' || arg === '--output') {
            if (i + 1 < args.length) {
                options.outputDir = args[i + 1];
                i++;
            }
        } else if (arg === '--format') {
            if (i + 1 < args.length) {
                options.format = args[i + 1];
                i++;
            }
        } else if (!arg.startsWith('-')) {
            // First non-option arg: command or path
            if (!commandFound && validCommands.includes(arg)) {
                options.command = arg;
                commandFound = true;
            } else {
                // Treat as project path
                options.projectPath = path.resolve(arg);
            }
        }
    }

    return options;
}

// Show help information
function showHelp() {
    console.log(`
Smart Roadmap - AI-Powered Development Roadmap Generator
Version: 1.0.0

USAGE:
  smart-roadmap [command] [path] [options]

COMMANDS:
  scan                 Scan project and generate roadmap (default)
  analyze              Detailed project analysis
  help                 Show this help message

ARGUMENTS:
  path                 Path to project directory (default: current directory)

OPTIONS:
  -v, --verbose        Show detailed output during scan
  -d, --dry-run        Preview without saving files
  -o, --output <dir>   Output directory (default: docs/)
  --format <type>      Output format: json, md, html, all (default: all)
  -h, --help           Show this help message
  --version            Show version number

EXAMPLES:
  smart-roadmap scan                    # Scan current directory
  smart-roadmap scan ./my-project       # Scan specific project
  smart-roadmap analyze --verbose       # Detailed analysis
  smart-roadmap scan -o ./reports       # Custom output directory
  smart-roadmap --help                  # Show help

OUTPUT FILES:
  - project-analysis.json               Machine-readable data
  - DEVELOPMENT_ROADMAP.md              Prioritized development plan
  - PROJECT_ANALYSIS.md                 Detailed analysis report

For more information, visit:
  https://github.com/chahuadev-com/Chahuadev-smart-roadmap
`);
}

// Show version
function showVersion() {
    const packagePath = path.join(__dirname, 'package.json');
    try {
        const pkg = JSON.parse(fs.readFileSync(packagePath, 'utf8'));
        console.log(`Smart Roadmap v${pkg.version}`);
        console.log(`Author: ${pkg.author.name || pkg.author}`);
    } catch (error) {
        console.log('Smart Roadmap v1.0.0');
        console.log('Author: Chahua Development Co., Ltd.');
    }
}

// Main CLI function
async function main() {
    const args = process.argv.slice(2);
    const options = parseArguments(args);

    // Show help or version
    if (options.help || args.includes('help')) {
        showHelp();
        return;
    }

    if (options.version) {
        showVersion();
        return;
    }

    // Validate project path
    if (!fs.existsSync(options.projectPath)) {
        console.error(`[ERROR] Project path not found: ${options.projectPath}`);
        process.exit(1);
    }

    console.log('Smart Roadmap v1.0.0');
    console.log('='.repeat(70));
    console.log(`Command: ${options.command}`);
    console.log(`Project: ${path.relative(process.cwd(), options.projectPath) || '.'}`);
    console.log(`Output: ${options.outputDir}`);
    if (options.dryRun) {
        console.log('[DRY RUN] No files will be saved');
    }
    console.log('');

    try {
        // Create scanner instance
        const scanner = new SmartRoadmapScanner({
            projectPath: options.projectPath,
            outputDir: options.outputDir,
            verbose: options.verbose
        });

        // Execute command
        if (options.command === 'scan' || options.command === 'analyze') {
            const analysis = await scanner.scan();

            if (!options.dryRun) {
                // Save analysis results
                const outputPath = path.join(options.projectPath, options.outputDir);
                
                // Create output directory if it doesn't exist
                if (!fs.existsSync(outputPath)) {
                    fs.mkdirSync(outputPath, { recursive: true });
                }

                // Save JSON
                const jsonPath = path.join(options.projectPath, 'project-analysis.json');
                fs.writeFileSync(jsonPath, JSON.stringify(analysis, null, 2), 'utf8');
                console.log(`[SUCCESS] Analysis saved: ${path.relative(process.cwd(), jsonPath)}`);

                // Future: Generate Markdown and HTML reports here
                console.log('[INFO] Roadmap generation will be implemented in next version');
            }

            console.log('\n[SUCCESS] Scan completed!');
            
            if (options.dryRun) {
                console.log('[INFO] Use without --dry-run to save reports');
            }

        } else {
            console.error(`[ERROR] Unknown command: ${options.command}`);
            console.log('Use --help to see available commands');
            process.exit(1);
        }

    } catch (error) {
        console.error(`\n[ERROR] ${error.message}`);
        if (options.verbose) {
            console.error(error.stack);
        }
        process.exit(1);
    }
}

// Run CLI if executed directly
if (require.main === module) {
    main().catch(error => {
        console.error(`[FATAL] ${error.message}`);
        process.exit(1);
    });
}

module.exports = { main, parseArguments, showHelp, showVersion };