<?php

declare(strict_types=1);

namespace Drush\Commands\composer_check;

use Consolidation\OutputFormatters\StructuredData\RowsOfFields;
use Drush\Commands\DrushCommands;
use Symfony\Component\Yaml\Yaml;

/**
 * MagpjmCommands provides Drush 9 commands for the MAGPJ run time module.
 */
class ComposerCheckCommands extends DrushCommands {

  /**
   * The serialization.yaml service.
   *
   * @var \Symfony\Component\Yaml
   */
  private $yaml;

  public function __construct() {
    $this->yaml = new Yaml();
  }

  /**
   * Command callback for composer-check.
   *
   * @param null|string $lockPath
   *   Optional. The path to a composer.lock file.
   */

  /**
   * Lists the packages requested in composer.json and the matching locked
   * version.
   *
   * @param ?string $lockPath
   *
   * @return \Consolidation\OutputFormatters\StructuredData\RowsOfFields
   *   The list of package versions, unless YAML encoding is used.
   *
   * @field-labels
   *   name: Name
   *   kind: Kind
   *   req: Requirement
   *   ver: Version
   *
   * @command composer:check
   * @aliases cch
   *
   * @option all List all locked packages, even those not requested
   * @option yaml Produce YAML output instead of a table
   *
   * @throws \Exception
   */
  public function composerCheck(string $lockPath = NULL) {
    $lockPath = $this->validateLockPath($lockPath);
    $jsonPath = $this->validateJsonPath($lockPath);

    ['run' => $jrPack, 'dev' => $jdPack] = $this->decodeJsonPackages($jsonPath);
    ['run' => $lrPack, 'dev' => $ldPack] = $this->decodeLockPackages($lockPath);

    $all = !!$this->input()->getOption('all');
    $yaml = !!$this->input()->getOption('yaml');

    $packages = ['run' => [], 'dev' => []];

    foreach ($jrPack as $package => $requirement) {
      if ($all || !empty($requirement)) {
        $package = mb_strtolower($package);
        $packages['run'][$package]['requirement'] = $requirement;
      }
    }
    foreach ($jdPack as $package => $requirement) {
      if ($all || !empty($requirement)) {
        $package = mb_strtolower($package);
        $packages['dev'][$package]['requirement'] = $requirement;
      }
    }
    foreach ($lrPack as $packageInfo) {
      $package = mb_strtolower($packageInfo['name']);
      if ($all || !empty($packages['run'][$package])) {
        $version = $packageInfo['version'];
        $packages['run'][$package]['version'] = $version;
      }
    }
    foreach ($ldPack as $packageInfo) {
      $package = mb_strtolower($packageInfo['name']);
      if ($all || !empty($packages['dev'][$package])) {
        $version = $packageInfo['version'];
        $packages['dev'][$package]['version'] = $version;
      }
    }
    ksort($packages['dev']);
    ksort($packages['run']);

    if ($yaml) {
      $this->output()->writeln($this->yaml->dump($packages, 3, 2));
      return NULL;
    }

    return $this->humanOutput($packages);
  }

  /**
   * Display a package comparison as a text table.
   *
   * @param array $packages
   *   A package comparison array.
   *
   * @return \Consolidation\OutputFormatters\StructuredData\RowsOfFields
   *
   */
  protected function humanOutput($packages): RowsOfFields {
    //$header = ['Name', 'Kind', 'Requirement', 'Version'];
    $rows = [];
    foreach ($packages as $kind => $kindPackages) {
      foreach ($kindPackages as $package => $info) {
        $rows["$package/$kind"] = [
          'name' => $package,
          'kind' => $kind,
          'req' => $info['requirement'] ?? '',
          'ver' => $info['version'] ?? '',
        ];
      }
    }
    ksort($rows);
    return new RowsOfFields($rows);
  }

  /**
   * @param string $jsonPath
   *
   * @return array
   */
  protected function decodeJsonPackages(string $jsonPath): array {
    $json = json_decode(file_get_contents($jsonPath), TRUE);
    $jsonPackages = $json['require'] ?? [];
    $jsonDevPackages = $json['require-dev'] ?? [];
    return ['run' => $jsonPackages, 'dev' => $jsonDevPackages];
  }

  protected function decodeLockPackages(string $lockPath): array {
    $file = json_decode(file_get_contents($lockPath), TRUE);
    $run = $file['packages'];
    $dev = $file['packages-dev'];

    $platform = $file['platform'];
    array_walk($platform, function (&$requirement, $component) {
      $requirement = [
        'name' => $component,
        'version' => $requirement,
      ];
    });
    $run = array_merge($run, $platform);
    $dev = array_merge($dev, $platform);

    return ['run' => $run, 'dev' => $dev];
  }

  /**
   * @param string $lockPath The lockPath command argument.
   *
   * @return string
   *
   * @throws \Exception
   */
  protected function validateJsonPath(string $lockPath): string {
    $jsonPath = dirname($lockPath) . '/composer.json';
    if (!is_file($jsonPath) && is_readable($jsonPath)) {
      throw new \Exception("Cannot read composer.json file");
    }
    return $jsonPath;
  }

  /**
   * @param string|null $lockPath The lockPath optional command argument.
   *
   * @return string|null The defaulted lock path.
   *
   * @throws \Exception If the defaulted lock path cannot be read.
   */
  protected function validateLockPath(?string $lockPath): ?string {
    if (empty($lockPath)) {
      $lockPath = dirname(DRUPAL_ROOT) . '/composer.lock';
    }
    if (!is_file($lockPath) && is_readable($lockPath)) {
      throw new \Exception("Cannot read composer.lock file");
    }
    return $lockPath;
  }

}