/**
 * CLI Interface for isocreator
 */

import { log } from './logging.ts';
import { IsoBuilder } from './classes/iso-builder.ts';
import { IsoCache } from './classes/iso-cache.ts';
import { ConfigManager } from './classes/config-manager.ts';

/**
 * Display help information
 */
function showHelp() {
  console.log(`
isocreator - Ubuntu ISO Customization Tool

USAGE:
  isocreator <COMMAND> [OPTIONS]

COMMANDS:
  build             Build a customized ISO
  cache             Manage ISO cache
  template          Generate config template
  validate          Validate config file
  version           Show version information
  help              Show this help message

BUILD OPTIONS:
  --config <file>              Use a YAML config file
  --ubuntu-version <version>   Ubuntu version (22.04, 24.04, etc.)
  --arch <arch>                Architecture (amd64 or arm64)
  --wifi-ssid <ssid>           WiFi SSID
  --wifi-password <password>   WiFi password
  --hostname <name>            System hostname
  --output <path>              Output ISO path
  --ssh-key <path>             Path to SSH public key

CACHE OPTIONS:
  cache list                   List cached ISOs
  cache download <version>     Download and cache an ISO
  cache clean                  Clean all cached ISOs

TEMPLATE OPTIONS:
  template create              Generate config template to stdout
  template create --output <file>  Save template to file

VALIDATE OPTIONS:
  validate <file>              Validate a config file

EXAMPLES:
  # Build from config file
  isocreator build --config myconfig.yaml

  # Quick build with CLI flags
  isocreator build \\
    --ubuntu-version 24.04 \\
    --arch amd64 \\
    --wifi-ssid "MyWiFi" \\
    --wifi-password "secret123" \\
    --hostname "myserver" \\
    --output ./custom-ubuntu.iso

  # Generate config template
  isocreator template create --output config.yaml

  # List cached ISOs
  isocreator cache list

SYSTEM REQUIREMENTS:
  - xorriso (for ISO manipulation)
  - syslinux-utils (for USB-bootable ISOs)

  Install on Ubuntu/Debian:
    sudo apt install xorriso syslinux-utils

  Install on macOS:
    brew install xorriso syslinux

For more information, visit:
  https://code.foss.global/serve.zone/isocreator
`);
}

/**
 * Show version information
 */
function showVersion() {
  console.log('isocreator version 1.0.0');
  console.log('Ubuntu ISO customization tool');
  console.log('https://code.foss.global/serve.zone/isocreator');
}

/**
 * Parse CLI arguments
 */
function parseArgs(args: string[]): Map<string, string | boolean> {
  const parsed = new Map<string, string | boolean>();
  let i = 0;

  while (i < args.length) {
    const arg = args[i];

    if (arg.startsWith('--')) {
      const key = arg.substring(2);
      const nextArg = args[i + 1];

      if (nextArg && !nextArg.startsWith('--')) {
        parsed.set(key, nextArg);
        i += 2;
      } else {
        parsed.set(key, true);
        i += 1;
      }
    } else {
      parsed.set(`_arg${i}`, arg);
      i += 1;
    }
  }

  return parsed;
}

/**
 * Handle build command
 */
async function handleBuild(args: Map<string, string | boolean>) {
  const builder = new IsoBuilder();
  const configManager = new ConfigManager();

  // Check if config file is provided
  if (args.has('config')) {
    const configPath = args.get('config') as string;
    const config = await configManager.loadFromFile(configPath);

    await builder.build(config, (step, progress) => {
      console.log(`[${progress}%] ${step}`);
    });
  } else {
    // Build from CLI flags
    log.error('CLI flag mode not yet implemented. Please use --config for now.');
    log.info('Generate a template: isocreator template create --output config.yaml');
    Deno.exit(1);
  }
}

/**
 * Handle cache commands
 */
async function handleCache(args: Map<string, string | boolean>) {
  const cache = new IsoCache();
  const subcommand = args.get('_arg1') as string;

  if (!subcommand || subcommand === 'list') {
    const entries = await cache.list();

    if (entries.length === 0) {
      console.log('No cached ISOs found.');
      return;
    }

    console.log('\nCached ISOs:');
    console.log('━'.repeat(80));

    for (const entry of entries) {
      const sizeMB = (entry.size / 1024 / 1024).toFixed(2);
      const date = new Date(entry.downloadedAt).toLocaleDateString();
      console.log(`${entry.version} (${entry.architecture}) - ${sizeMB} MB - ${date}`);
      console.log(`  ${entry.path}`);
    }

    console.log('━'.repeat(80));
  } else if (subcommand === 'clean') {
    await cache.clean();
    console.log('Cache cleaned.');
  } else if (subcommand === 'download') {
    const version = args.get('_arg2') as string;
    const arch = (args.get('arch') as string) || 'amd64';

    if (!version) {
      log.error('Please specify a version: isocreator cache download <version>');
      Deno.exit(1);
    }

    await cache.downloadAndCache(version, arch as 'amd64' | 'arm64', (downloaded, total) => {
      const percent = ((downloaded / total) * 100).toFixed(1);
      process.stdout.write(`\r📥 Download progress: ${percent}%`);
    });

    console.log();
  }
}

/**
 * Handle template commands
 */
async function handleTemplate(args: Map<string, string | boolean>) {
  const configManager = new ConfigManager();
  const subcommand = args.get('_arg1') as string;

  if (!subcommand || subcommand === 'create') {
    const outputPath = args.get('output') as string | undefined;

    if (outputPath) {
      await configManager.saveTemplate(outputPath);
    } else {
      console.log(configManager.generateTemplate());
    }
  }
}

/**
 * Handle validate command
 */
async function handleValidate(args: Map<string, string | boolean>) {
  const configPath = args.get('_arg1') as string;

  if (!configPath) {
    log.error('Please specify a config file: isocreator validate <file>');
    Deno.exit(1);
  }

  const configManager = new ConfigManager();
  try {
    await configManager.loadFromFile(configPath);
    log.success('Configuration is valid!');
  } catch (err) {
    log.error(`Validation failed: ${err instanceof Error ? err.message : String(err)}`);
    Deno.exit(1);
  }
}

/**
 * Main CLI entry point
 */
export async function startCli() {
  const args = parseArgs(Deno.args);
  const command = args.get('_arg0') as string;

  try {
    switch (command) {
      case 'build':
        await handleBuild(args);
        break;

      case 'cache':
        await handleCache(args);
        break;

      case 'template':
        await handleTemplate(args);
        break;

      case 'validate':
        await handleValidate(args);
        break;

      case 'version':
        showVersion();
        break;

      case 'help':
      case undefined:
        showHelp();
        break;

      default:
        log.error(`Unknown command: ${command}`);
        log.info('Run "isocreator help" for usage information');
        Deno.exit(1);
    }
  } catch (err) {
    log.error(`Error: ${err instanceof Error ? err.message : String(err)}`);
    Deno.exit(1);
  }
}