<?php

/**
 * @file
 * A Drush plugin to compare composer.json and composer.lock.
 */

use Drupal\Component\Utility\Unicode;
use Symfony\Component\Yaml\Yaml;

/**
 * Implements hook_drush_command().
 */
function composer_check_drush_command() {
  $cmds['composer-check'] = [
    'aliases' => ['cck'],
    'description' => 'Lists the packages requested in composer.json and the matching locked version.',
    'arguments' => [
      'composer.lock' => 'The path to the lock file. Defaults to the one in drupal root.',
    ],
    'options' => [
      'all' => [
        'description' => 'List all locked packages, even those not requested',
        'required' => FALSE,
      ],
      'yaml' => 'Produce YAML output instead of a table',
    ],
  ];

  return $cmds;
}

/**
 * Command callback for composer-check.
 *
 * @param null|string $lockPath
 *   Optional. The path to a composer.lock file.
 */
function drush_composer_check($lockPath = NULL) {
  if (empty($lockPath)) {
    $lockPath = DRUPAL_ROOT . '/composer.lock';
  }
  if (!is_file($lockPath) && is_readable($lockPath)) {
    drush_die("Cannot read lock file");
  }

  $jsonPath = dirname($lockPath) . '/composer.json';
  if (!is_file($jsonPath) && is_readable($jsonPath)) {
    drush_die("Cannot read json file");
  }

  $json = json_decode(file_get_contents($jsonPath), TRUE);
  $jsonPackages = $json['require'] ?? [];
  $jsonDevPackages = $json['require-dev'] ?? [];

  $lockFile = json_decode(file_get_contents($lockPath), TRUE);
  $lockPackages = $lockFile['packages'];
  $lockDevPackages = $lockFile['packages-dev'];

  $lockPlatform = $lockFile['platform'];
  array_walk($lockPlatform, function (&$requirement, $component) {
    $requirement = [
      'name' => $component,
      'version' => $requirement,
    ];
  });
  $lockPackages = array_merge($lockPackages, $lockPlatform);
  $lockDevPackages = array_merge($lockDevPackages, $lockPlatform);

  $all = !!drush_get_option('all');
  $packages = ['dev' => [], 'run' => []];
  foreach ($jsonPackages as $package => $requirement) {
    if ($all || !empty($requirement)) {
      $package = Unicode::strtolower($package);
      $packages['run'][$package]['requirement'] = $requirement;
    }
  }
  foreach ($jsonDevPackages as $package => $requirement) {
    if ($all || !empty($requirement)) {
      $package = Unicode::strtolower($package);
      $packages['dev'][$package]['requirement'] = $requirement;
    }
  }
  foreach ($lockPackages as $packageInfo) {
    $package = Unicode::strtolower($packageInfo['name']);
    if ($all || !empty($packages['run'][$package])) {
      $version = $packageInfo['version'];
      $packages['run'][$package]['version'] = $version;
    }
  }
  foreach ($lockDevPackages as $packageInfo) {
    $package = Unicode::strtolower($packageInfo['name']);
    if ($all || !empty($packages['dev'][$package])) {
      $version = $packageInfo['version'];
      $packages['dev'][$package]['version'] = $version;
    }
  }
  ksort($packages['dev']);
  ksort($packages['run']);

  if (drush_get_option('yaml')) {
    echo Yaml::dump($packages, 3);
    return;
  }

  _composer_check_output_human($packages);
}

/**
 * Display a package comparison as a text table.
 *
 * @param array $packages
 *   A package comparison array.
 */
function _composer_check_output_human($packages) {
  $header = ['Name', 'Kind', 'Requirement', 'Version'];
  $rows = [$header];
  foreach ($packages as $kind => $kindPackages) {
    foreach ($kindPackages as $package => $info) {
      $rows["$package/$kind"] = [
        $package,
        $kind,
        $info['requirement'] ?? '',
        $info['version'] ?? '',
      ];
    }
  }
  ksort($rows);
  drush_print_table($rows, FALSE);
}