#!/usr/bin/env node

/**
 * Claude Task Master CLI
 * Main entry point for globally installed package
 */

import { fileURLToPath } from 'url';
import { dirname, resolve } from 'path';
import { createRequire } from 'module';
import { spawn } from 'child_process';
import { Command } from 'commander';
import { displayHelp, displayBanner } from '../scripts/modules/ui.js';
import { registerCommands } from '../scripts/modules/commands.js';
import { detectCamelCaseFlags } from '../scripts/modules/utils.js';

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

// Get package information
const packageJson = require('../package.json');
const version = packageJson.version;

// Get paths to script files
const devScriptPath = resolve(__dirname, '../scripts/dev.js');
const initScriptPath = resolve(__dirname, '../scripts/init.js');

// Helper function to run dev.js with arguments
function runDevScript(args) {
  // Debug: Show the transformed arguments when DEBUG=1 is set
  if (process.env.DEBUG === '1') {
    console.error('\nDEBUG - CLI Wrapper Analysis:');
    console.error('- Original command: ' + process.argv.join(' '));
    console.error('- Transformed args: ' + args.join(' '));
    console.error('- dev.js will receive: node ' + devScriptPath + ' ' + args.join(' ') + '\n');
  }
  
  // For testing: If TEST_MODE is set, just print args and exit
  if (process.env.TEST_MODE === '1') {
    console.log('Would execute:');
    console.log(`node ${devScriptPath} ${args.join(' ')}`);
    process.exit(0);
    return;
  }
  
  const child = spawn('node', [devScriptPath, ...args], {
    stdio: 'inherit',
    cwd: process.cwd()
  });
  
  child.on('close', (code) => {
    process.exit(code);
  });
}

// Helper function to detect camelCase and convert to kebab-case
const toKebabCase = (str) => str.replace(/([A-Z])/g, '-$1').toLowerCase();

/**
 * Create a wrapper action that passes the command to dev.js
 * @param {string} commandName - The name of the command
 * @returns {Function} Wrapper action function
 */
function createDevScriptAction(commandName) {
  return (options, cmd) => {
    // Check for camelCase flags and error out with helpful message
    const camelCaseFlags = detectCamelCaseFlags(process.argv);
    
    // If camelCase flags were found, show error and exit
    if (camelCaseFlags.length > 0) {
      console.error('\nError: Please use kebab-case for CLI flags:');
      camelCaseFlags.forEach(flag => {
        console.error(`  Instead of: --${flag.original}`);
        console.error(`  Use:        --${flag.kebabCase}`);
      });
      console.error('\nExample: task-master parse-prd --num-tasks=5 instead of --numTasks=5\n');
      process.exit(1);
    }
    
    // Since we've ensured no camelCase flags, we can now just:
    // 1. Start with the command name
    const args = [commandName];
    
    // 3. Get positional arguments and explicit flags from the command line
    const commandArgs = [];
    const positionals = new Set(); // Track positional args we've seen
    
    // Find the command in raw process.argv to extract args
    const commandIndex = process.argv.indexOf(commandName);
    if (commandIndex !== -1) {
      // Process all args after the command name
      for (let i = commandIndex + 1; i < process.argv.length; i++) {
        const arg = process.argv[i];
        
        if (arg.startsWith('--')) {
          // It's a flag - pass through as is
          commandArgs.push(arg);
          // Skip the next arg if this is a flag with a value (not --flag=value format)
          if (!arg.includes('=') && 
              i + 1 < process.argv.length && 
              !process.argv[i+1].startsWith('--')) {
            commandArgs.push(process.argv[++i]);
          }
        } else if (!positionals.has(arg)) {
          // It's a positional argument we haven't seen
          commandArgs.push(arg);
          positionals.add(arg);
        }
      }
    }
    
    // Add all command line args we collected
    args.push(...commandArgs);
    
    // 4. Add default options from Commander if not specified on command line
    // Track which options we've seen on the command line
    const userOptions = new Set();
    for (const arg of commandArgs) {
      if (arg.startsWith('--')) {
        // Extract option name (without -- and value)
        const name = arg.split('=')[0].slice(2);
        userOptions.add(name);
        
        // Add the kebab-case version too, to prevent duplicates
        const kebabName = name.replace(/([A-Z])/g, '-$1').toLowerCase();
        userOptions.add(kebabName);
        
        // Add the camelCase version as well
        const camelName = kebabName.replace(/-([a-z])/g, (_, letter) => letter.toUpperCase());
        userOptions.add(camelName);
      }
    }
    
    // Add Commander-provided defaults for options not specified by user
    Object.entries(options).forEach(([key, value]) => {
      // Debug output to see what keys we're getting
      if (process.env.DEBUG === '1') {
        console.error(`DEBUG - Processing option: ${key} = ${value}`);
      }

      // Special case for numTasks > num-tasks (a known problem case)
      if (key === 'numTasks') {
        if (process.env.DEBUG === '1') {
          console.error('DEBUG - Converting numTasks to num-tasks');
        }
        if (!userOptions.has('num-tasks') && !userOptions.has('numTasks')) {
          args.push(`--num-tasks=${value}`);
        }
        return;
      }
      
      // Skip built-in Commander properties and options the user provided
      if (['parent', 'commands', 'options', 'rawArgs'].includes(key) || userOptions.has(key)) {
        return;
      }
      
      // Also check the kebab-case version of this key
      const kebabKey = key.replace(/([A-Z])/g, '-$1').toLowerCase();
      if (userOptions.has(kebabKey)) {
        return;
      }
      
      // Add default values, using kebab-case for the parameter name
      if (value !== undefined) {
        if (typeof value === 'boolean') {
          if (value === true) {
            args.push(`--${kebabKey}`);
          } else if (value === false && key === 'generate') {
            args.push('--no-generate');
          }
        } else {
          // Always use kebab-case for option names
          args.push(`--${kebabKey}=${value}`);
        }
      }
    });
    
    // Special handling for parent parameter (uses -p)
    if (options.parent && !args.includes('-p') && !userOptions.has('parent')) {
      args.push('-p', options.parent);
    }
    
    // Debug output for troubleshooting
    if (process.env.DEBUG === '1') {
      console.error('DEBUG - Command args:', commandArgs);
      console.error('DEBUG - User options:', Array.from(userOptions));
      console.error('DEBUG - Commander options:', options);
      console.error('DEBUG - Final args:', args);
    }
    
    // Run the script with our processed args
    runDevScript(args);
  };
}

// Special case for the 'init' command which uses a different script
function registerInitCommand(program) {
  program
    .command('init')
    .description('Initialize a new project')
    .option('-y, --yes', 'Skip prompts and use default values')
    .option('-n, --name <name>', 'Project name')
    .option('-d, --description <description>', 'Project description')
    .option('-v, --version <version>', 'Project version')
    .option('-a, --author <author>', 'Author name')
    .option('--skip-install', 'Skip installing dependencies')
    .option('--dry-run', 'Show what would be done without making changes')
    .action((options) => {
      // Pass through any options to the init script
      const args = ['--yes', 'name', 'description', 'version', 'author', 'skip-install', 'dry-run']
        .filter(opt => options[opt])
        .map(opt => {
          if (opt === 'yes' || opt === 'skip-install' || opt === 'dry-run') {
            return `--${opt}`;
          }
          return `--${opt}=${options[opt]}`;
        });
      
      const child = spawn('node', [initScriptPath, ...args], {
        stdio: 'inherit',
        cwd: process.cwd()
      });
      
      child.on('close', (code) => {
        process.exit(code);
      });
    });
}

// Set up the command-line interface
const program = new Command();

program
  .name('task-master')
  .description('Claude Task Master CLI')
  .version(version)
  .addHelpText('afterAll', () => {
    // Use the same help display function as dev.js for consistency
    displayHelp();
    return ''; // Return empty string to prevent commander's default help
  });

// Add custom help option to directly call our help display
program.helpOption('-h, --help', 'Display help information');
program.on('--help', () => {
  displayHelp();
});

// Add special case commands
registerInitCommand(program);

program
  .command('dev')
  .description('Run the dev.js script')
  .allowUnknownOption(true)
  .action(() => {
    const args = process.argv.slice(process.argv.indexOf('dev') + 1);
    runDevScript(args);
  });

// Use a temporary Command instance to get all command definitions
const tempProgram = new Command();
registerCommands(tempProgram);

// For each command in the temp instance, add a modified version to our actual program
tempProgram.commands.forEach(cmd => {
  if (['init', 'dev'].includes(cmd.name())) {
    // Skip commands we've already defined specially
    return;
  }
  
  // Create a new command with the same name and description
  const newCmd = program
    .command(cmd.name())
    .description(cmd.description())
    .allowUnknownOption(); // Allow any options, including camelCase ones
  
  // Copy all options
  cmd.options.forEach(opt => {
    newCmd.option(
      opt.flags,
      opt.description,
      opt.defaultValue
    );
  });
  
  // Set the action to proxy to dev.js
  newCmd.action(createDevScriptAction(cmd.name()));
});

// Parse the command line arguments
program.parse(process.argv);

// Show help if no command was provided (just 'task-master' with no args)
if (process.argv.length <= 2) {
  displayBanner();
  displayHelp();
  process.exit(0);
}

// Add exports at the end of the file
if (typeof module !== 'undefined') {
  module.exports = {
    detectCamelCaseFlags
  };
}