#!/usr/bin/env node

import fs from 'fs';
import path from 'path';
import { execSync } from 'child_process';
import readline from 'readline';
import { fileURLToPath } from 'url';
import { dirname } from 'path';

const __filename = fileURLToPath(import.meta.url);
const __dirname = dirname(__filename);

// Create readline interface for user input
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

// Define log levels and colors
const LOG_LEVELS = {
  debug: 0,
  info: 1,
  warn: 2,
  error: 3
};

const COLORS = {
  reset: '\x1b[0m',
  bright: '\x1b[1m',
  dim: '\x1b[2m',
  red: '\x1b[31m',
  green: '\x1b[32m',
  yellow: '\x1b[33m',
  blue: '\x1b[34m',
  magenta: '\x1b[35m',
  cyan: '\x1b[36m'
};

// Get log level from environment or default to info
const LOG_LEVEL = process.env.LOG_LEVEL ? LOG_LEVELS[process.env.LOG_LEVEL.toLowerCase()] : LOG_LEVELS.info;

// Logging function
function log(level, ...args) {
  const levelValue = LOG_LEVELS[level.toLowerCase()];
  
  if (levelValue >= LOG_LEVEL) {
    const prefix = {
      debug: `${COLORS.dim}[DEBUG]${COLORS.reset}`,
      info: `${COLORS.blue}[INFO]${COLORS.reset}`,
      warn: `${COLORS.yellow}[WARN]${COLORS.reset}`,
      error: `${COLORS.red}[ERROR]${COLORS.reset}`
    }[level.toLowerCase()];
    
    console.log(prefix, ...args);
  }
  
  // Write to debug log if DEBUG=true
  if (process.env.DEBUG === 'true') {
    const logMessage = `[${level.toUpperCase()}] ${args.join(' ')}\n`;
    fs.appendFileSync('init-debug.log', logMessage);
  }
}

// Function to create directory if it doesn't exist
function ensureDirectoryExists(dirPath) {
  if (!fs.existsSync(dirPath)) {
    fs.mkdirSync(dirPath, { recursive: true });
    log('info', `Created directory: ${dirPath}`);
  }
}

// Function to copy a file from the package to the target directory
function copyTemplateFile(templateName, targetPath, replacements = {}) {
  // Get the template content from the templates directory
  const templatePath = path.join(__dirname, '..', 'templates', templateName);
  let content = fs.readFileSync(templatePath, 'utf8');
  
  // Replace placeholders with actual values
  Object.entries(replacements).forEach(([key, value]) => {
    const regex = new RegExp(`\\{\\{${key}\\}\\}`, 'g');
    content = content.replace(regex, value);
  });
  
  // Write the content to the target path
  fs.writeFileSync(targetPath, content);
  log('info', `Created file: ${targetPath}`);
}

// Main function to initialize a new project
async function initializeProject(options = {}) {
  return new Promise((resolve) => {
    // If options are provided, use them directly
    if (options.projectName && options.projectDescription) {
      const projectName = options.projectName;
      const projectDescription = options.projectDescription;
      const projectVersion = options.projectVersion || '1.0.0';
      const authorName = options.authorName || '';
      
      createProjectStructure(projectName, projectDescription, projectVersion, authorName);
      resolve({
        projectName,
        projectDescription,
        projectVersion,
        authorName
      });
    } else {
      // Otherwise, prompt the user for input
      rl.question('Enter project name: ', (projectName) => {
        rl.question('Enter project description: ', (projectDescription) => {
          rl.question('Enter project version (default: 1.0.0): ', (projectVersion) => {
            rl.question('Enter your name: ', (authorName) => {
              // Set default version if not provided
              if (!projectVersion.trim()) {
                projectVersion = '1.0.0';
              }
              
              // Create the project structure
              createProjectStructure(projectName, projectDescription, projectVersion, authorName);
              
              rl.close();
              resolve({
                projectName,
                projectDescription,
                projectVersion,
                authorName
              });
            });
          });
        });
      });
    }
  });
}

// Function to create the project structure
function createProjectStructure(projectName, projectDescription, projectVersion, authorName) {
  const targetDir = process.cwd();
  log('info', `Initializing project in ${targetDir}`);
  
  // Create directories
  ensureDirectoryExists(path.join(targetDir, '.cursor', 'rules'));
  ensureDirectoryExists(path.join(targetDir, 'scripts'));
  ensureDirectoryExists(path.join(targetDir, 'tasks'));
  
  // Create package.json
  const packageJson = {
    name: projectName.toLowerCase().replace(/\s+/g, '-'),
    version: projectVersion,
    description: projectDescription,
    author: authorName,
    type: "module",
    scripts: {
      "dev": "node scripts/dev.js",
      "list": "node scripts/dev.js list",
      "generate": "node scripts/dev.js generate",
      "parse-prd": "node scripts/dev.js parse-prd"
    },
    dependencies: {
      "@anthropic-ai/sdk": "^0.39.0",
      "chalk": "^4.1.2",
      "commander": "^11.1.0",
      "dotenv": "^16.3.1"
    }
  };
  
  fs.writeFileSync(
    path.join(targetDir, 'package.json'),
    JSON.stringify(packageJson, null, 2)
  );
  log('info', 'Created package.json');
  
  // Copy template files with replacements
  const replacements = {
    projectName,
    projectDescription,
    projectVersion,
    authorName,
    year: new Date().getFullYear()
  };
  
  // Copy .env.example
  copyTemplateFile('env.example', path.join(targetDir, '.env.example'), replacements);
  
  // Copy .gitignore
  copyTemplateFile('gitignore', path.join(targetDir, '.gitignore'));
  
  // Copy dev_workflow.mdc
  copyTemplateFile('dev_workflow.mdc', path.join(targetDir, '.cursor', 'rules', 'dev_workflow.mdc'));
  
  // Copy scripts/dev.js
  copyTemplateFile('dev.js', path.join(targetDir, 'scripts', 'dev.js'));
  
  // Copy scripts/README.md
  copyTemplateFile('scripts_README.md', path.join(targetDir, 'scripts', 'README.md'));
  
  // Copy example_prd.txt
  copyTemplateFile('example_prd.txt', path.join(targetDir, 'scripts', 'example_prd.txt'));
  
  // Create main README.md
  copyTemplateFile('README.md', path.join(targetDir, 'README.md'), replacements);
  
  // Create empty tasks.json
  const tasksJson = {
    meta: {
      name: projectName,
      version: projectVersion,
      description: projectDescription
    },
    tasks: []
  };
  
  fs.writeFileSync(
    path.join(targetDir, 'tasks.json'),
    JSON.stringify(tasksJson, null, 2)
  );
  log('info', 'Created tasks.json');
  
  // Initialize git repository if git is available
  try {
    if (!fs.existsSync(path.join(targetDir, '.git'))) {
      execSync('git init', { stdio: 'ignore' });
      log('info', 'Initialized git repository');
    }
  } catch (error) {
    log('warn', 'Git not available, skipping repository initialization');
  }
  
  log('info', `${COLORS.green}${COLORS.bright}Project initialized successfully!${COLORS.reset}`);
  log('info', '');
  log('info', 'Next steps:');
  log('info', '1. Run `npm install` to install dependencies');
  log('info', '2. Create a .env file with your ANTHROPIC_API_KEY (see .env.example)');
  log('info', '3. Add your PRD to the project');
  log('info', '4. Run `npm run parse-prd -- --input=<your-prd-file.txt>` to generate tasks');
  log('info', '');
}

// Run the initialization if this script is executed directly
if (process.argv[1] === fileURLToPath(import.meta.url)) {
  (async function main() {
    try {
      await initializeProject();
    } catch (error) {
      log('error', 'Failed to initialize project:', error);
      process.exit(1);
    }
  })();
}

// Export functions for programmatic use
export {
  initializeProject,
  createProjectStructure,
  log
};