#!/usr/bin/env node

/**
 * JQHTML Official CLI Compiler
 *
 * Compiles .jqhtml templates to JavaScript with multiple output formats
 * Uses unified compiler module for single source of truth
 */

import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import { compileTemplate } from '../dist/index.js';
import { readFileSync } from 'fs';

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

// Get package version
const packagePath = path.join(path.dirname(__dirname), 'package.json');
const packageJson = JSON.parse(readFileSync(packagePath, 'utf-8'));
const VERSION = packageJson.version;

// Parse command line arguments
function parseArgs(argv) {
  const args = {
    input: null,
    output: null,
    format: 'iife',
    sourcemap: false,
    statusJson: false,
    help: false,
    version: false
  };

  for (let i = 2; i < argv.length; i++) {
    const arg = argv[i];

    if (arg === '--help' || arg === '-h') {
      args.help = true;
    } else if (arg === '--version' || arg === '-v') {
      args.version = true;
    } else if (arg === '--output' || arg === '-o') {
      args.output = argv[++i];
      if (!args.output) {
        throw new Error('--output requires a file path');
      }
    } else if (arg === '--format') {
      args.format = argv[++i];
      if (!['iife', 'esm', 'cjs', 'umd'].includes(args.format)) {
        throw new Error(`Invalid format: ${args.format}. Must be one of: iife, esm, cjs, umd`);
      }
    } else if (arg === '--sourcemap') {
      args.sourcemap = true;
    } else if (arg === '--status-json') {
      args.statusJson = true;
    } else if (!arg.startsWith('-')) {
      args.input = arg;
    }
  }

  return args;
}

// Show help message
function showHelp() {
  console.log(`
JQHTML CLI Compiler v${VERSION}

Usage: jqhtml-compile <input.jqhtml> [options]

Options:
  --output, -o <file>  Write output to file instead of stdout
  --format <format>    Output format: iife|esm|cjs|umd (default: iife)
  --sourcemap         Include inline sourcemap
  --status-json       Output errors as JSON for programmatic parsing
  --version, -v       Show version number
  --help, -h          Show this help message

Examples:
  jqhtml compile component.jqhtml
  jqhtml compile component.jqhtml --output component.js
  jqhtml compile component.jqhtml --format esm --sourcemap
  jqhtml compile component.jqhtml -o dist/component.js --format umd

Output formats:
  iife - Self-executing function that registers with window.jqhtml
  esm  - ES module export
  cjs  - CommonJS module.exports
  umd  - Universal module (works as AMD, CommonJS, or global)
`);
}


// Main compilation function
async function compile(inputFile, options) {
  try {
    // Read input file
    const inputPath = path.resolve(inputFile);
    if (!fs.existsSync(inputPath)) {
      throw new Error(`Input file not found: ${inputPath}`);
    }

    const source = fs.readFileSync(inputPath, 'utf-8');
    const filename = path.basename(inputPath);

    // Use unified compiler
    const compiled = compileTemplate(source, filename, {
      format: options.format,
      sourcemap: options.sourcemap,
      version: VERSION
    });

    const formattedCode = compiled.code;

    if (options.statusJson) {
      // Output as JSON for programmatic consumption
      const result = {
        status: 'success',
        result: formattedCode
      };
      if (options.output) {
        result.outputFile = options.output;
      }
      console.log(JSON.stringify(result));
    } else if (options.output) {
      // Write to output file
      const outputPath = path.resolve(options.output);
      const outputDir = path.dirname(outputPath);

      // Create output directory if it doesn't exist
      if (!fs.existsSync(outputDir)) {
        fs.mkdirSync(outputDir, { recursive: true });
      }

      fs.writeFileSync(outputPath, formattedCode, 'utf-8');
      console.log(`✓ Compiled ${inputFile} → ${options.output}`);
    } else {
      // Output the compiled code to stdout without trailing newline
      process.stdout.write(formattedCode);
    }

    return 0; // Success
  } catch (error) {
    if (options.statusJson) {
      // Output error as JSON
      const errorObj = {
        status: 'error',
        error: {
          type: error.constructor.name,
          message: error.message,
          file: error.filename || null,
          line: error.line || null,
          column: error.column || null,
          context: error.context || null,
          suggestion: error.suggestion || null
        }
      };
      console.log(JSON.stringify(errorObj));
    } else {
      // Output error to stderr
      console.error(`Error: ${error.message}`);
      if (error.line) {
        console.error(`  at line ${error.line}, column ${error.column || 0}`);
      }
      if (error.context) {
        console.error(`  context: ${error.context}`);
      }
      if (error.suggestion) {
        console.error(`  suggestion: ${error.suggestion}`);
      }
    }
    return 1; // Error
  }
}

// Main entry point
async function main() {
  try {
    const args = parseArgs(process.argv);

    if (args.help) {
      showHelp();
      process.exit(0);
    }

    if (args.version) {
      console.log(`v${VERSION}`);
      process.exit(0);
    }

    if (!args.input) {
      if (args.statusJson) {
        console.log(JSON.stringify({
          status: 'error',
          error: {
            type: 'ArgumentError',
            message: 'No input file specified'
          }
        }));
      } else {
        console.error('Error: No input file specified');
        console.error('Usage: jqhtml compile <input.jqhtml> [options]');
        console.error('Use --help for more information');
      }
      process.exit(1);
    }

    const exitCode = await compile(args.input, args);
    process.exit(exitCode);
  } catch (error) {
    console.error('Fatal error:', error.message);
    process.exit(1);
  }
}

// Run the CLI
main();