/**
 * commands.js
 * Command-line interface for the Task Master CLI
 */

import { program } from 'commander';
import path from 'path';
import chalk from 'chalk';
import boxen from 'boxen';
import fs from 'fs';
import https from 'https';

import { CONFIG, log, readJSON } from './utils.js';
import {
  parsePRD,
  updateTasks,
  generateTaskFiles,
  setTaskStatus,
  listTasks,
  expandTask,
  expandAllTasks,
  clearSubtasks,
  addTask,
  addSubtask,
  removeSubtask,
  analyzeTaskComplexity,
  updateTaskById,
  updateSubtaskById
} from './task-manager.js';

import {
  addDependency,
  removeDependency,
  validateDependenciesCommand,
  fixDependenciesCommand
} from './dependency-manager.js';

import {
  displayBanner,
  displayHelp,
  displayNextTask,
  displayTaskById,
  displayComplexityReport,
  getStatusWithColor,
  confirmTaskOverwrite
} from './ui.js';

/**
 * Configure and register CLI commands
 * @param {Object} program - Commander program instance
 */
function registerCommands(programInstance) {
  // Add global error handler for unknown options
  programInstance.on('option:unknown', function(unknownOption) {
    const commandName = this._name || 'unknown';
    console.error(chalk.red(`Error: Unknown option '${unknownOption}'`));
    console.error(chalk.yellow(`Run 'task-master ${commandName} --help' to see available options`));
    process.exit(1);
  });
  
  // Default help
  programInstance.on('--help', function() {
    displayHelp();
  });
  
  // parse-prd command
  programInstance
    .command('parse-prd')
    .description('Parse a PRD file and generate tasks')
    .argument('[file]', 'Path to the PRD file')
    .option('-i, --input <file>', 'Path to the PRD file (alternative to positional argument)')
    .option('-o, --output <file>', 'Output file path', 'tasks/tasks.json')
    .option('-n, --num-tasks <number>', 'Number of tasks to generate', '10')
    .option('-f, --force', 'Skip confirmation when overwriting existing tasks')
    .action(async (file, options) => {
      // Use input option if file argument not provided
      const inputFile = file || options.input;
      const defaultPrdPath = 'scripts/prd.txt';
      const numTasks = parseInt(options.numTasks, 10);
      const outputPath = options.output;
      const force = options.force || false;
      
      // Helper function to check if tasks.json exists and confirm overwrite
      async function confirmOverwriteIfNeeded() {
        if (fs.existsSync(outputPath) && !force) {
          const shouldContinue = await confirmTaskOverwrite(outputPath);
          if (!shouldContinue) {
            console.log(chalk.yellow('Operation cancelled by user.'));
            return false;
          }
        }
        return true;
      }
      
      // If no input file specified, check for default PRD location
      if (!inputFile) {
        if (fs.existsSync(defaultPrdPath)) {
          console.log(chalk.blue(`Using default PRD file: ${defaultPrdPath}`));
          
          // Check for existing tasks.json before proceeding
          if (!await confirmOverwriteIfNeeded()) return;
          
          console.log(chalk.blue(`Generating ${numTasks} tasks...`));
          await parsePRD(defaultPrdPath, outputPath, numTasks);
          return;
        }
        
        console.log(chalk.yellow('No PRD file specified and default PRD file not found at scripts/prd.txt.'));
        console.log(boxen(
          chalk.white.bold('Parse PRD Help') + '\n\n' +
          chalk.cyan('Usage:') + '\n' +
          `  task-master parse-prd <prd-file.txt> [options]\n\n` +
          chalk.cyan('Options:') + '\n' +
          '  -i, --input <file>       Path to the PRD file (alternative to positional argument)\n' +
          '  -o, --output <file>      Output file path (default: "tasks/tasks.json")\n' +
          '  -n, --num-tasks <number> Number of tasks to generate (default: 10)\n' +
          '  -f, --force              Skip confirmation when overwriting existing tasks\n\n' +
          chalk.cyan('Example:') + '\n' +
          '  task-master parse-prd requirements.txt --num-tasks 15\n' +
          '  task-master parse-prd --input=requirements.txt\n' +
          '  task-master parse-prd --force\n\n' +
          chalk.yellow('Note: This command will:') + '\n' +
          '  1. Look for a PRD file at scripts/prd.txt by default\n' +
          '  2. Use the file specified by --input or positional argument if provided\n' +
          '  3. Generate tasks from the PRD and overwrite any existing tasks.json file',
          { padding: 1, borderColor: 'blue', borderStyle: 'round' }
        ));
        return;
      }
      
      // Check for existing tasks.json before proceeding with specified input file
      if (!await confirmOverwriteIfNeeded()) return;
      
      console.log(chalk.blue(`Parsing PRD file: ${inputFile}`));
      console.log(chalk.blue(`Generating ${numTasks} tasks...`));
      
      await parsePRD(inputFile, outputPath, numTasks);
    });

  // update command
  programInstance
    .command('update')
    .description('Update tasks based on new information or implementation changes')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('--from <id>', 'Task ID to start updating from (tasks with ID >= this value will be updated)', '1')
    .option('-p, --prompt <text>', 'Prompt explaining the changes or new context (required)')
    .option('-r, --research', 'Use Perplexity AI for research-backed task updates')
    .action(async (options) => {
      const tasksPath = options.file;
      const fromId = parseInt(options.from, 10);
      const prompt = options.prompt;
      const useResearch = options.research || false;
      
      if (!prompt) {
        console.error(chalk.red('Error: --prompt parameter is required. Please provide information about the changes.'));
        process.exit(1);
      }
      
      console.log(chalk.blue(`Updating tasks from ID >= ${fromId} with prompt: "${prompt}"`));
      console.log(chalk.blue(`Tasks file: ${tasksPath}`));
      
      if (useResearch) {
        console.log(chalk.blue('Using Perplexity AI for research-backed task updates'));
      }
      
      await updateTasks(tasksPath, fromId, prompt, useResearch);
    });

  // update-task command
  programInstance
    .command('update-task')
    .description('Update a single task by ID with new information')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('-i, --id <id>', 'Task ID to update (required)')
    .option('-p, --prompt <text>', 'Prompt explaining the changes or new context (required)')
    .option('-r, --research', 'Use Perplexity AI for research-backed task updates')
    .action(async (options) => {
      try {
        const tasksPath = options.file;
        
        // Validate required parameters
        if (!options.id) {
          console.error(chalk.red('Error: --id parameter is required'));
          console.log(chalk.yellow('Usage example: task-master update-task --id=23 --prompt="Update with new information"'));
          process.exit(1);
        }
        
        // Parse the task ID and validate it's a number
        const taskId = parseInt(options.id, 10);
        if (isNaN(taskId) || taskId <= 0) {
          console.error(chalk.red(`Error: Invalid task ID: ${options.id}. Task ID must be a positive integer.`));
          console.log(chalk.yellow('Usage example: task-master update-task --id=23 --prompt="Update with new information"'));
          process.exit(1);
        }
        
        if (!options.prompt) {
          console.error(chalk.red('Error: --prompt parameter is required. Please provide information about the changes.'));
          console.log(chalk.yellow('Usage example: task-master update-task --id=23 --prompt="Update with new information"'));
          process.exit(1);
        }
        
        const prompt = options.prompt;
        const useResearch = options.research || false;
        
        // Validate tasks file exists
        if (!fs.existsSync(tasksPath)) {
          console.error(chalk.red(`Error: Tasks file not found at path: ${tasksPath}`));
          if (tasksPath === 'tasks/tasks.json') {
            console.log(chalk.yellow('Hint: Run task-master init or task-master parse-prd to create tasks.json first'));
          } else {
            console.log(chalk.yellow(`Hint: Check if the file path is correct: ${tasksPath}`));
          }
          process.exit(1);
        }
        
        console.log(chalk.blue(`Updating task ${taskId} with prompt: "${prompt}"`));
        console.log(chalk.blue(`Tasks file: ${tasksPath}`));
        
        if (useResearch) {
          // Verify Perplexity API key exists if using research
          if (!process.env.PERPLEXITY_API_KEY) {
            console.log(chalk.yellow('Warning: PERPLEXITY_API_KEY environment variable is missing. Research-backed updates will not be available.'));
            console.log(chalk.yellow('Falling back to Claude AI for task update.'));
          } else {
            console.log(chalk.blue('Using Perplexity AI for research-backed task update'));
          }
        }
        
        const result = await updateTaskById(tasksPath, taskId, prompt, useResearch);
        
        // If the task wasn't updated (e.g., if it was already marked as done)
        if (!result) {
          console.log(chalk.yellow('\nTask update was not completed. Review the messages above for details.'));
        }
      } catch (error) {
        console.error(chalk.red(`Error: ${error.message}`));
        
        // Provide more helpful error messages for common issues
        if (error.message.includes('task') && error.message.includes('not found')) {
          console.log(chalk.yellow('\nTo fix this issue:'));
          console.log('  1. Run task-master list to see all available task IDs');
          console.log('  2. Use a valid task ID with the --id parameter');
        } else if (error.message.includes('API key')) {
          console.log(chalk.yellow('\nThis error is related to API keys. Check your environment variables.'));
        }
        
        if (CONFIG.debug) {
          console.error(error);
        }
        
        process.exit(1);
      }
    });

  // update-subtask command
  programInstance
    .command('update-subtask')
    .description('Update a subtask by appending additional timestamped information')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('-i, --id <id>', 'Subtask ID to update in format "parentId.subtaskId" (required)')
    .option('-p, --prompt <text>', 'Prompt explaining what information to add (required)')
    .option('-r, --research', 'Use Perplexity AI for research-backed updates')
    .action(async (options) => {
      try {
        const tasksPath = options.file;
        
        // Validate required parameters
        if (!options.id) {
          console.error(chalk.red('Error: --id parameter is required'));
          console.log(chalk.yellow('Usage example: task-master update-subtask --id=5.2 --prompt="Add more details about the API endpoint"'));
          process.exit(1);
        }
        
        // Validate subtask ID format (should contain a dot)
        const subtaskId = options.id;
        if (!subtaskId.includes('.')) {
          console.error(chalk.red(`Error: Invalid subtask ID format: ${subtaskId}. Subtask ID must be in format "parentId.subtaskId"`));
          console.log(chalk.yellow('Usage example: task-master update-subtask --id=5.2 --prompt="Add more details about the API endpoint"'));
          process.exit(1);
        }
        
        if (!options.prompt) {
          console.error(chalk.red('Error: --prompt parameter is required. Please provide information to add to the subtask.'));
          console.log(chalk.yellow('Usage example: task-master update-subtask --id=5.2 --prompt="Add more details about the API endpoint"'));
          process.exit(1);
        }
        
        const prompt = options.prompt;
        const useResearch = options.research || false;
        
        // Validate tasks file exists
        if (!fs.existsSync(tasksPath)) {
          console.error(chalk.red(`Error: Tasks file not found at path: ${tasksPath}`));
          if (tasksPath === 'tasks/tasks.json') {
            console.log(chalk.yellow('Hint: Run task-master init or task-master parse-prd to create tasks.json first'));
          } else {
            console.log(chalk.yellow(`Hint: Check if the file path is correct: ${tasksPath}`));
          }
          process.exit(1);
        }
        
        console.log(chalk.blue(`Updating subtask ${subtaskId} with prompt: "${prompt}"`));
        console.log(chalk.blue(`Tasks file: ${tasksPath}`));
        
        if (useResearch) {
          // Verify Perplexity API key exists if using research
          if (!process.env.PERPLEXITY_API_KEY) {
            console.log(chalk.yellow('Warning: PERPLEXITY_API_KEY environment variable is missing. Research-backed updates will not be available.'));
            console.log(chalk.yellow('Falling back to Claude AI for subtask update.'));
          } else {
            console.log(chalk.blue('Using Perplexity AI for research-backed subtask update'));
          }
        }
        
        const result = await updateSubtaskById(tasksPath, subtaskId, prompt, useResearch);
        
        if (!result) {
          console.log(chalk.yellow('\nSubtask update was not completed. Review the messages above for details.'));
        }
      } catch (error) {
        console.error(chalk.red(`Error: ${error.message}`));
        
        // Provide more helpful error messages for common issues
        if (error.message.includes('subtask') && error.message.includes('not found')) {
          console.log(chalk.yellow('\nTo fix this issue:'));
          console.log('  1. Run task-master list --with-subtasks to see all available subtask IDs');
          console.log('  2. Use a valid subtask ID with the --id parameter in format "parentId.subtaskId"');
        } else if (error.message.includes('API key')) {
          console.log(chalk.yellow('\nThis error is related to API keys. Check your environment variables.'));
        }
        
        if (CONFIG.debug) {
          console.error(error);
        }
        
        process.exit(1);
      }
    });

  // generate command
  programInstance
    .command('generate')
    .description('Generate task files from tasks.json')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('-o, --output <dir>', 'Output directory', 'tasks')
    .action(async (options) => {
      const tasksPath = options.file;
      const outputDir = options.output;
      
      console.log(chalk.blue(`Generating task files from: ${tasksPath}`));
      console.log(chalk.blue(`Output directory: ${outputDir}`));
      
      await generateTaskFiles(tasksPath, outputDir);
    });

  // set-status command
  programInstance
    .command('set-status')
    .description('Set the status of a task')
    .option('-i, --id <id>', 'Task ID (can be comma-separated for multiple tasks)')
    .option('-s, --status <status>', 'New status (todo, in-progress, review, done)')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .action(async (options) => {
      const tasksPath = options.file;
      const taskId = options.id;
      const status = options.status;
      
      if (!taskId || !status) {
        console.error(chalk.red('Error: Both --id and --status are required'));
        process.exit(1);
      }
      
      console.log(chalk.blue(`Setting status of task(s) ${taskId} to: ${status}`));
      
      await setTaskStatus(tasksPath, taskId, status);
    });

  // list command
  programInstance
    .command('list')
    .description('List all tasks')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('-s, --status <status>', 'Filter by status')
    .option('--with-subtasks', 'Show subtasks for each task')
    .action(async (options) => {
      const tasksPath = options.file;
      const statusFilter = options.status;
      const withSubtasks = options.withSubtasks || false;
      
      console.log(chalk.blue(`Listing tasks from: ${tasksPath}`));
      if (statusFilter) {
        console.log(chalk.blue(`Filtering by status: ${statusFilter}`));
      }
      if (withSubtasks) {
        console.log(chalk.blue('Including subtasks in listing'));
      }
      
      await listTasks(tasksPath, statusFilter, withSubtasks);
    });

  // expand command
  programInstance
    .command('expand')
    .description('Break down tasks into detailed subtasks')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('-i, --id <id>', 'Task ID to expand')
    .option('-a, --all', 'Expand all tasks')
    .option('-n, --num <number>', 'Number of subtasks to generate', CONFIG.defaultSubtasks.toString())
    .option('--research', 'Enable Perplexity AI for research-backed subtask generation')
    .option('-p, --prompt <text>', 'Additional context to guide subtask generation')
    .option('--force', 'Force regeneration of subtasks for tasks that already have them')
    .action(async (options) => {
      const tasksPath = options.file;
      const idArg = options.id ? parseInt(options.id, 10) : null;
      const allFlag = options.all;
      const numSubtasks = parseInt(options.num, 10);
      const forceFlag = options.force;
      const useResearch = options.research === true;
      const additionalContext = options.prompt || '';
      
      // Debug log to verify the value
      log('debug', `Research enabled: ${useResearch}`);
      
      if (allFlag) {
        console.log(chalk.blue(`Expanding all tasks with ${numSubtasks} subtasks each...`));
        if (useResearch) {
          console.log(chalk.blue('Using Perplexity AI for research-backed subtask generation'));
        } else {
          console.log(chalk.yellow('Research-backed subtask generation disabled'));
        }
        if (additionalContext) {
          console.log(chalk.blue(`Additional context: "${additionalContext}"`));
        }
        await expandAllTasks(numSubtasks, useResearch, additionalContext, forceFlag);
      } else if (idArg) {
        console.log(chalk.blue(`Expanding task ${idArg} with ${numSubtasks} subtasks...`));
        if (useResearch) {
          console.log(chalk.blue('Using Perplexity AI for research-backed subtask generation'));
        } else {
          console.log(chalk.yellow('Research-backed subtask generation disabled'));
        }
        if (additionalContext) {
          console.log(chalk.blue(`Additional context: "${additionalContext}"`));
        }
        await expandTask(idArg, numSubtasks, useResearch, additionalContext);
      } else {
        console.error(chalk.red('Error: Please specify a task ID with --id=<id> or use --all to expand all tasks.'));
      }
    });

  // analyze-complexity command
  programInstance
    .command('analyze-complexity')
    .description(`Analyze tasks and generate expansion recommendations${chalk.reset('')}`)
    .option('-o, --output <file>', 'Output file path for the report', 'scripts/task-complexity-report.json')
    .option('-m, --model <model>', 'LLM model to use for analysis (defaults to configured model)')
    .option('-t, --threshold <number>', 'Minimum complexity score to recommend expansion (1-10)', '5')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('-r, --research', 'Use Perplexity AI for research-backed complexity analysis')
    .action(async (options) => {
      const tasksPath = options.file || 'tasks/tasks.json';
      const outputPath = options.output;
      const modelOverride = options.model;
      const thresholdScore = parseFloat(options.threshold);
      const useResearch = options.research || false;
      
      console.log(chalk.blue(`Analyzing task complexity from: ${tasksPath}`));
      console.log(chalk.blue(`Output report will be saved to: ${outputPath}`));
      
      if (useResearch) {
        console.log(chalk.blue('Using Perplexity AI for research-backed complexity analysis'));
      }
      
      await analyzeTaskComplexity(options);
    });

  // clear-subtasks command
  programInstance
    .command('clear-subtasks')
    .description('Clear subtasks from specified tasks')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('-i, --id <ids>', 'Task IDs (comma-separated) to clear subtasks from')
    .option('--all', 'Clear subtasks from all tasks')
    .action(async (options) => {
      const tasksPath = options.file;
      const taskIds = options.id;
      const all = options.all;

      if (!taskIds && !all) {
        console.error(chalk.red('Error: Please specify task IDs with --id=<ids> or use --all to clear all tasks'));
        process.exit(1);
      }

      if (all) {
        // If --all is specified, get all task IDs
        const data = readJSON(tasksPath);
        if (!data || !data.tasks) {
          console.error(chalk.red('Error: No valid tasks found'));
          process.exit(1);
        }
        const allIds = data.tasks.map(t => t.id).join(',');
        clearSubtasks(tasksPath, allIds);
      } else {
        clearSubtasks(tasksPath, taskIds);
      }
    });

  // add-task command
  programInstance
    .command('add-task')
    .description('Add a new task using AI')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('-p, --prompt <text>', 'Description of the task to add (required)')
    .option('-d, --dependencies <ids>', 'Comma-separated list of task IDs this task depends on')
    .option('--priority <priority>', 'Task priority (high, medium, low)', 'medium')
    .action(async (options) => {
      const tasksPath = options.file;
      const prompt = options.prompt;
      const dependencies = options.dependencies ? options.dependencies.split(',').map(id => parseInt(id.trim(), 10)) : [];
      const priority = options.priority;
      
      if (!prompt) {
        console.error(chalk.red('Error: --prompt parameter is required. Please provide a task description.'));
        process.exit(1);
      }
      
      console.log(chalk.blue(`Adding new task with description: "${prompt}"`));
      console.log(chalk.blue(`Dependencies: ${dependencies.length > 0 ? dependencies.join(', ') : 'None'}`));
      console.log(chalk.blue(`Priority: ${priority}`));
      
      await addTask(tasksPath, prompt, dependencies, priority);
    });

  // next command
  programInstance
    .command('next')
    .description(`Show the next task to work on based on dependencies and status${chalk.reset('')}`)
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .action(async (options) => {
      const tasksPath = options.file;
      await displayNextTask(tasksPath);
    });

  // show command
  programInstance
    .command('show')
    .description(`Display detailed information about a specific task${chalk.reset('')}`)
    .argument('[id]', 'Task ID to show')
    .option('-i, --id <id>', 'Task ID to show')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .action(async (taskId, options) => {
      const idArg = taskId || options.id;
      
      if (!idArg) {
        console.error(chalk.red('Error: Please provide a task ID'));
        process.exit(1);
      }
      
      const tasksPath = options.file;
      await displayTaskById(tasksPath, idArg);
    });

  // add-dependency command
  programInstance
    .command('add-dependency')
    .description('Add a dependency to a task')
    .option('-i, --id <id>', 'Task ID to add dependency to')
    .option('-d, --depends-on <id>', 'Task ID that will become a dependency')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .action(async (options) => {
      const tasksPath = options.file;
      const taskId = options.id;
      const dependencyId = options.dependsOn;
      
      if (!taskId || !dependencyId) {
        console.error(chalk.red('Error: Both --id and --depends-on are required'));
        process.exit(1);
      }
      
      // Handle subtask IDs correctly by preserving the string format for IDs containing dots
      // Only use parseInt for simple numeric IDs
      const formattedTaskId = taskId.includes('.') ? taskId : parseInt(taskId, 10);
      const formattedDependencyId = dependencyId.includes('.') ? dependencyId : parseInt(dependencyId, 10);
      
      await addDependency(tasksPath, formattedTaskId, formattedDependencyId);
    });

  // remove-dependency command
  programInstance
    .command('remove-dependency')
    .description('Remove a dependency from a task')
    .option('-i, --id <id>', 'Task ID to remove dependency from')
    .option('-d, --depends-on <id>', 'Task ID to remove as a dependency')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .action(async (options) => {
      const tasksPath = options.file;
      const taskId = options.id;
      const dependencyId = options.dependsOn;
      
      if (!taskId || !dependencyId) {
        console.error(chalk.red('Error: Both --id and --depends-on are required'));
        process.exit(1);
      }
      
      // Handle subtask IDs correctly by preserving the string format for IDs containing dots
      // Only use parseInt for simple numeric IDs
      const formattedTaskId = taskId.includes('.') ? taskId : parseInt(taskId, 10);
      const formattedDependencyId = dependencyId.includes('.') ? dependencyId : parseInt(dependencyId, 10);
      
      await removeDependency(tasksPath, formattedTaskId, formattedDependencyId);
    });

  // validate-dependencies command
  programInstance
    .command('validate-dependencies')
    .description(`Identify invalid dependencies without fixing them${chalk.reset('')}`)
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .action(async (options) => {
      await validateDependenciesCommand(options.file);
    });

  // fix-dependencies command
  programInstance
    .command('fix-dependencies')
    .description(`Fix invalid dependencies automatically${chalk.reset('')}`)
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .action(async (options) => {
      await fixDependenciesCommand(options.file);
    });

  // complexity-report command
  programInstance
    .command('complexity-report')
    .description(`Display the complexity analysis report${chalk.reset('')}`)
    .option('-f, --file <file>', 'Path to the report file', 'scripts/task-complexity-report.json')
    .action(async (options) => {
      await displayComplexityReport(options.file);
    });

  // add-subtask command
  programInstance
    .command('add-subtask')
    .description('Add a subtask to an existing task')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('-p, --parent <id>', 'Parent task ID (required)')
    .option('-i, --task-id <id>', 'Existing task ID to convert to subtask')
    .option('-t, --title <title>', 'Title for the new subtask (when creating a new subtask)')
    .option('-d, --description <text>', 'Description for the new subtask')
    .option('--details <text>', 'Implementation details for the new subtask')
    .option('--dependencies <ids>', 'Comma-separated list of dependency IDs for the new subtask')
    .option('-s, --status <status>', 'Status for the new subtask', 'pending')
    .option('--skip-generate', 'Skip regenerating task files')
    .action(async (options) => {
      const tasksPath = options.file;
      const parentId = options.parent;
      const existingTaskId = options.taskId;
      const generateFiles = !options.skipGenerate;
      
      if (!parentId) {
        console.error(chalk.red('Error: --parent parameter is required. Please provide a parent task ID.'));
        showAddSubtaskHelp();
        process.exit(1);
      }
      
      // Parse dependencies if provided
      let dependencies = [];
      if (options.dependencies) {
        dependencies = options.dependencies.split(',').map(id => {
          // Handle both regular IDs and dot notation
          return id.includes('.') ? id.trim() : parseInt(id.trim(), 10);
        });
      }
      
      try {
        if (existingTaskId) {
          // Convert existing task to subtask
          console.log(chalk.blue(`Converting task ${existingTaskId} to a subtask of ${parentId}...`));
          await addSubtask(tasksPath, parentId, existingTaskId, null, generateFiles);
          console.log(chalk.green(`✓ Task ${existingTaskId} successfully converted to a subtask of task ${parentId}`));
        } else if (options.title) {
          // Create new subtask with provided data
          console.log(chalk.blue(`Creating new subtask for parent task ${parentId}...`));
          
          const newSubtaskData = {
            title: options.title,
            description: options.description || '',
            details: options.details || '',
            status: options.status || 'pending',
            dependencies: dependencies
          };
          
          const subtask = await addSubtask(tasksPath, parentId, null, newSubtaskData, generateFiles);
          console.log(chalk.green(`✓ New subtask ${parentId}.${subtask.id} successfully created`));
          
          // Display success message and suggested next steps
          console.log(boxen(
            chalk.white.bold(`Subtask ${parentId}.${subtask.id} Added Successfully`) + '\n\n' +
            chalk.white(`Title: ${subtask.title}`) + '\n' +
            chalk.white(`Status: ${getStatusWithColor(subtask.status)}`) + '\n' +
            (dependencies.length > 0 ? chalk.white(`Dependencies: ${dependencies.join(', ')}`) + '\n' : '') +
            '\n' +
            chalk.white.bold('Next Steps:') + '\n' +
            chalk.cyan(`1. Run ${chalk.yellow(`task-master show ${parentId}`)} to see the parent task with all subtasks`) + '\n' +
            chalk.cyan(`2. Run ${chalk.yellow(`task-master set-status --id=${parentId}.${subtask.id} --status=in-progress`)} to start working on it`),
            { padding: 1, borderColor: 'green', borderStyle: 'round', margin: { top: 1 } }
          ));
        } else {
          console.error(chalk.red('Error: Either --task-id or --title must be provided.'));
          console.log(boxen(
            chalk.white.bold('Usage Examples:') + '\n\n' +
            chalk.white('Convert existing task to subtask:') + '\n' +
            chalk.yellow(`  task-master add-subtask --parent=5 --task-id=8`) + '\n\n' +
            chalk.white('Create new subtask:') + '\n' +
            chalk.yellow(`  task-master add-subtask --parent=5 --title="Implement login UI" --description="Create the login form"`) + '\n\n',
            { padding: 1, borderColor: 'blue', borderStyle: 'round' }
          ));
          process.exit(1);
        }
      } catch (error) {
        console.error(chalk.red(`Error: ${error.message}`));
        process.exit(1);
      }
    })
    .on('error', function(err) {
      console.error(chalk.red(`Error: ${err.message}`));
      showAddSubtaskHelp();
      process.exit(1);
    });

  // Helper function to show add-subtask command help
  function showAddSubtaskHelp() {
    console.log(boxen(
      chalk.white.bold('Add Subtask Command Help') + '\n\n' +
      chalk.cyan('Usage:') + '\n' +
      `  task-master add-subtask --parent=<id> [options]\n\n` +
      chalk.cyan('Options:') + '\n' +
      '  -p, --parent <id>         Parent task ID (required)\n' +
      '  -i, --task-id <id>        Existing task ID to convert to subtask\n' +
      '  -t, --title <title>       Title for the new subtask\n' +
      '  -d, --description <text>  Description for the new subtask\n' +
      '  --details <text>          Implementation details for the new subtask\n' +
      '  --dependencies <ids>      Comma-separated list of dependency IDs\n' +
      '  -s, --status <status>     Status for the new subtask (default: "pending")\n' +
      '  -f, --file <file>         Path to the tasks file (default: "tasks/tasks.json")\n' +
      '  --skip-generate           Skip regenerating task files\n\n' +
      chalk.cyan('Examples:') + '\n' +
      '  task-master add-subtask --parent=5 --task-id=8\n' +
      '  task-master add-subtask -p 5 -t "Implement login UI" -d "Create the login form"',
      { padding: 1, borderColor: 'blue', borderStyle: 'round' }
    ));
  }

  // remove-subtask command
  programInstance
    .command('remove-subtask')
    .description('Remove a subtask from its parent task')
    .option('-f, --file <file>', 'Path to the tasks file', 'tasks/tasks.json')
    .option('-i, --id <id>', 'Subtask ID(s) to remove in format "parentId.subtaskId" (can be comma-separated for multiple subtasks)')
    .option('-c, --convert', 'Convert the subtask to a standalone task instead of deleting it')
    .option('--skip-generate', 'Skip regenerating task files')
    .action(async (options) => {
      const tasksPath = options.file;
      const subtaskIds = options.id;
      const convertToTask = options.convert || false;
      const generateFiles = !options.skipGenerate;
      
      if (!subtaskIds) {
        console.error(chalk.red('Error: --id parameter is required. Please provide subtask ID(s) in format "parentId.subtaskId".'));
        showRemoveSubtaskHelp();
        process.exit(1);
      }
      
      try {
        // Split by comma to support multiple subtask IDs
        const subtaskIdArray = subtaskIds.split(',').map(id => id.trim());
        
        for (const subtaskId of subtaskIdArray) {
          // Validate subtask ID format
          if (!subtaskId.includes('.')) {
            console.error(chalk.red(`Error: Subtask ID "${subtaskId}" must be in format "parentId.subtaskId"`));
            showRemoveSubtaskHelp();
            process.exit(1);
          }
          
          console.log(chalk.blue(`Removing subtask ${subtaskId}...`));
          if (convertToTask) {
            console.log(chalk.blue('The subtask will be converted to a standalone task'));
          }
          
          const result = await removeSubtask(tasksPath, subtaskId, convertToTask, generateFiles);
          
          if (convertToTask && result) {
            // Display success message and next steps for converted task
            console.log(boxen(
              chalk.white.bold(`Subtask ${subtaskId} Converted to Task #${result.id}`) + '\n\n' +
              chalk.white(`Title: ${result.title}`) + '\n' +
              chalk.white(`Status: ${getStatusWithColor(result.status)}`) + '\n' +
              chalk.white(`Dependencies: ${result.dependencies.join(', ')}`) + '\n\n' +
              chalk.white.bold('Next Steps:') + '\n' +
              chalk.cyan(`1. Run ${chalk.yellow(`task-master show ${result.id}`)} to see details of the new task`) + '\n' +
              chalk.cyan(`2. Run ${chalk.yellow(`task-master set-status --id=${result.id} --status=in-progress`)} to start working on it`),
              { padding: 1, borderColor: 'green', borderStyle: 'round', margin: { top: 1 } }
            ));
          } else {
            // Display success message for deleted subtask
            console.log(boxen(
              chalk.white.bold(`Subtask ${subtaskId} Removed`) + '\n\n' +
              chalk.white('The subtask has been successfully deleted.'),
              { padding: 1, borderColor: 'green', borderStyle: 'round', margin: { top: 1 } }
            ));
          }
        }
      } catch (error) {
        console.error(chalk.red(`Error: ${error.message}`));
        showRemoveSubtaskHelp();
        process.exit(1);
      }
    })
    .on('error', function(err) {
      console.error(chalk.red(`Error: ${err.message}`));
      showRemoveSubtaskHelp();
      process.exit(1);
    });
    
  // Helper function to show remove-subtask command help
  function showRemoveSubtaskHelp() {
    console.log(boxen(
      chalk.white.bold('Remove Subtask Command Help') + '\n\n' +
      chalk.cyan('Usage:') + '\n' +
      `  task-master remove-subtask --id=<parentId.subtaskId> [options]\n\n` +
      chalk.cyan('Options:') + '\n' +
      '  -i, --id <id>       Subtask ID(s) to remove in format "parentId.subtaskId" (can be comma-separated, required)\n' +
      '  -c, --convert       Convert the subtask to a standalone task instead of deleting it\n' +
      '  -f, --file <file>   Path to the tasks file (default: "tasks/tasks.json")\n' +
      '  --skip-generate     Skip regenerating task files\n\n' +
      chalk.cyan('Examples:') + '\n' +
      '  task-master remove-subtask --id=5.2\n' +
      '  task-master remove-subtask --id=5.2,6.3,7.1\n' +
      '  task-master remove-subtask --id=5.2 --convert',
      { padding: 1, borderColor: 'blue', borderStyle: 'round' }
    ));
  }

  // init command (documentation only, implementation is in init.js)
  programInstance
    .command('init')
    .description('Initialize a new project with Task Master structure')
    .option('-n, --name <name>', 'Project name')
    .option('-my_name <name>', 'Project name (alias for --name)')
    .option('--my_name <name>', 'Project name (alias for --name)')
    .option('-d, --description <description>', 'Project description')
    .option('-my_description <description>', 'Project description (alias for --description)')
    .option('-v, --version <version>', 'Project version')
    .option('-my_version <version>', 'Project version (alias for --version)')
    .option('-a, --author <author>', 'Author name')
    .option('-y, --yes', 'Skip prompts and use default values')
    .option('--skip-install', 'Skip installing dependencies')
    .action(() => {
      console.log(chalk.yellow('The init command must be run as a standalone command: task-master init'));
      console.log(chalk.cyan('Example usage:'));
      console.log(chalk.white('  task-master init -n "My Project" -d "Project description"'));
      console.log(chalk.white('  task-master init -my_name "My Project" -my_description "Project description"'));
      console.log(chalk.white('  task-master init -y'));
      process.exit(0);
    });
    
  // Add more commands as needed...
  
  return programInstance;
}

/**
 * Setup the CLI application
 * @returns {Object} Configured Commander program
 */
function setupCLI() {
  // Create a new program instance
  const programInstance = program
    .name('dev')
    .description('AI-driven development task management')
    .version(() => {
      // Read version directly from package.json
      try {
        const packageJsonPath = path.join(process.cwd(), 'package.json');
        if (fs.existsSync(packageJsonPath)) {
          const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'));
          return packageJson.version;
        }
      } catch (error) {
        // Silently fall back to default version
      }
      return CONFIG.projectVersion; // Default fallback
    })
    .helpOption('-h, --help', 'Display help')
    .addHelpCommand(false) // Disable default help command
    .on('--help', () => {
      displayHelp(); // Use your custom help display instead
    })
    .on('-h', () => {
      displayHelp();
      process.exit(0);
    });
  
  // Modify the help option to use your custom display
  programInstance.helpInformation = () => {
    displayHelp();
    return '';
  };
  
  // Register commands
  registerCommands(programInstance);
  
  return programInstance;
}

/**
 * Check for newer version of task-master-ai
 * @returns {Promise<{currentVersion: string, latestVersion: string, needsUpdate: boolean}>}
 */
async function checkForUpdate() {
  // Get current version from package.json
  let currentVersion = CONFIG.projectVersion;
  try {
    // Try to get the version from the installed package
    const packageJsonPath = path.join(process.cwd(), 'node_modules', 'task-master-ai', 'package.json');
    if (fs.existsSync(packageJsonPath)) {
      const packageJson = JSON.parse(fs.readFileSync(packageJsonPath, 'utf8'));
      currentVersion = packageJson.version;
    }
  } catch (error) {
    // Silently fail and use default
    log('debug', `Error reading current package version: ${error.message}`);
  }

  return new Promise((resolve) => {
    // Get the latest version from npm registry
    const options = {
      hostname: 'registry.npmjs.org',
      path: '/task-master-ai',
      method: 'GET',
      headers: {
        'Accept': 'application/vnd.npm.install-v1+json' // Lightweight response
      }
    };

    const req = https.request(options, (res) => {
      let data = '';
      
      res.on('data', (chunk) => {
        data += chunk;
      });
      
      res.on('end', () => {
        try {
          const npmData = JSON.parse(data);
          const latestVersion = npmData['dist-tags']?.latest || currentVersion;
          
          // Compare versions
          const needsUpdate = compareVersions(currentVersion, latestVersion) < 0;
          
          resolve({
            currentVersion,
            latestVersion,
            needsUpdate
          });
        } catch (error) {
          log('debug', `Error parsing npm response: ${error.message}`);
          resolve({
            currentVersion,
            latestVersion: currentVersion,
            needsUpdate: false
          });
        }
      });
    });
    
    req.on('error', (error) => {
      log('debug', `Error checking for updates: ${error.message}`);
      resolve({
        currentVersion,
        latestVersion: currentVersion,
        needsUpdate: false
      });
    });
    
    // Set a timeout to avoid hanging if npm is slow
    req.setTimeout(3000, () => {
      req.abort();
      log('debug', 'Update check timed out');
      resolve({
        currentVersion,
        latestVersion: currentVersion,
        needsUpdate: false
      });
    });
    
    req.end();
  });
}

/**
 * Compare semantic versions
 * @param {string} v1 - First version
 * @param {string} v2 - Second version
 * @returns {number} -1 if v1 < v2, 0 if v1 = v2, 1 if v1 > v2
 */
function compareVersions(v1, v2) {
  const v1Parts = v1.split('.').map(p => parseInt(p, 10));
  const v2Parts = v2.split('.').map(p => parseInt(p, 10));
  
  for (let i = 0; i < Math.max(v1Parts.length, v2Parts.length); i++) {
    const v1Part = v1Parts[i] || 0;
    const v2Part = v2Parts[i] || 0;
    
    if (v1Part < v2Part) return -1;
    if (v1Part > v2Part) return 1;
  }
  
  return 0;
}

/**
 * Display upgrade notification message
 * @param {string} currentVersion - Current version
 * @param {string} latestVersion - Latest version
 */
function displayUpgradeNotification(currentVersion, latestVersion) {
  const message = boxen(
    `${chalk.blue.bold('Update Available!')} ${chalk.dim(currentVersion)} → ${chalk.green(latestVersion)}\n\n` +
    `Run ${chalk.cyan('npm i task-master-ai@latest -g')} to update to the latest version with new features and bug fixes.`,
    {
      padding: 1,
      margin: { top: 1, bottom: 1 },
      borderColor: 'yellow',
      borderStyle: 'round'
    }
  );
  
  console.log(message);
}

/**
 * Parse arguments and run the CLI
 * @param {Array} argv - Command-line arguments
 */
async function runCLI(argv = process.argv) {
  try {
    // Display banner if not in a pipe
    if (process.stdout.isTTY) {
      displayBanner();
    }
    
    // If no arguments provided, show help
    if (argv.length <= 2) {
      displayHelp();
      process.exit(0);
    }
    
    // Start the update check in the background - don't await yet
    const updateCheckPromise = checkForUpdate();
    
    // Setup and parse
    const programInstance = setupCLI();
    await programInstance.parseAsync(argv);
    
    // After command execution, check if an update is available
    const updateInfo = await updateCheckPromise;
    if (updateInfo.needsUpdate) {
      displayUpgradeNotification(updateInfo.currentVersion, updateInfo.latestVersion);
    }
  } catch (error) {
    console.error(chalk.red(`Error: ${error.message}`));
    
    if (CONFIG.debug) {
      console.error(error);
    }
    
    process.exit(1);
  }
}

export {
  registerCommands,
  setupCLI,
  runCLI,
  checkForUpdate,
  compareVersions,
  displayUpgradeNotification
};