<?php
/**
 * @file
 * Functions for the generate makefile command.
 */

use Drush\Log\LogLevel;

/**
 * Generate the actual contents of the .make file.
 */
function _drush_make_generate_makefile_contents($projects, $libraries = array(), $core_version = NULL, $defaults = array()) {
  if (is_null($core_version)) {
    $core_version = drush_get_drupal_core_compatibility();
  }

  $header = array();
  $header[] = '; This file was auto-generated by drush make';
  $header['core'] = $core_version;
  $header['api'] = MAKE_API;
  $header[] = '';
  if (!empty($defaults)) {
    _drush_make_generate_defaults($defaults, $header);
    $header[] = '';
  }
  $header[] = '; Core';

  return _drush_make_generate_makefile_body($projects, $header) . _drush_make_generate_makefile_body($libraries);
}

function _drush_make_generate_makefile_body($projects, $output = array()) {
  $custom = FALSE;
  $previous_type = 'core';
  if (isset($projects)) {
    foreach ($projects as $name => $project) {
      $type = (isset($project['type']) && ($project['type'] == 'library')) ? 'libraries' : 'projects';
      if ($previous_type != $project['_type']) {
        $previous_type = $project['_type'];
        $output[] = '; ' . ucfirst($previous_type) . 's';
      }
      unset($project['_type']);
      if (!$project && is_string($name)) {
        $output[] = $type . '[] = "' . $name . '"';
        continue;
      }
      $base = $type . '[' . $name . ']';
      if (isset($project['custom_download'])) {
        $custom = TRUE;
        $output[] = '; Please fill the following out. Type may be one of get, git, bzr or svn,';
        $output[] = '; and url is the url of the download.';
        $output[$base . '[download][type]'] = '""';
        $output[$base . '[download][url]'] = '""';
        unset($project['custom_download']);
      }

      $output = array_merge($output, _drush_make_generate_lines($base, $project));
      $output[] = '';
    }
  }
  $string = '';
  foreach ($output as $k => $v) {
    if (!is_numeric($k)) {
      $string .= $k . ' = ' . $v;
    }
    else {
      $string .= $v;
    }
    $string .= "\n";
  }
  if ($custom) {
    drush_log(dt('Some of the properties in your makefile will have to be manually edited. Please do that now.'), LogLevel::WARNING);
  }
  return $string;
}

/**
 * Write a makefile based on data parsed from a previous makefile.
 *
 * @param $file
 *   The path to the file to write our generated makefile to, or TRUE to
 *   print to the terminal.
 * @param $makefile
 *   A makefile on which to base our generated one.
 */
function make_generate_from_makefile($file, $makefile) {
  if (!$info = make_parse_info_file($makefile)) {
    return drush_set_error('MAKE_GENERATE_FAILED_PARSE', dt('Failed to parse makefile :makefile.', array(':makefile' => $makefile)));
  }
  $projects = drush_get_option('DRUSH_MAKE_PROJECTS', FALSE);
  if ($projects === FALSE) {
    $projects = make_prepare_projects(FALSE, $info);
    if (isset($projects['contrib'])) {
      $projects = array_merge($projects['core'], $projects['contrib']);
    }
  }

  $defaults = isset($info['defaults']) ? $info['defaults'] : array();
  $core = current($projects);
  $core = $core['core'];
  foreach ($projects as $name => $project) {
    // If a specific revision was requested, do not set the version.
    if (!isset($project['revision'])) {
      $projects[$name]['version'] = isset($project['download']['full_version']) ? $project['download']['full_version'] : '';
      if ($project['type'] != 'core' && strpos($projects[$name]['version'], $project['core']) === 0) {
        $projects[$name]['version'] = substr($projects[$name]['version'], strlen($project['core'] . '-'));
      }
    }
    else {
      unset($projects[$name]['version']);
    }
    $projects[$name]['_type'] = $project['type'];

    if ($project['download']['type'] == 'git') {
      drush_make_resolve_git_refs($projects[$name]);
    }

    // Don't clutter the makefile with defaults
    if (is_array($defaults)) {
      foreach ($defaults as $type => $defs) {
        if ($type == 'projects') {
          foreach ($defs as $key => $value) {
            if (isset($project[$key]) && $project[$key] == $value) {
              unset($projects[$name][$key]);
            }
          }
        }
      }
    }
    if ($project['name'] == $name) {
      unset($projects[$name]['name']);
    }
    if ($project['type'] == 'module' && !isset($info[$name]['type'])) {
      unset($projects[$name]['type']);  // Module is the default
    }
    if (!(isset($project['download']['type'])) || ($project['download']['type'] == 'pm')) {
      unset($projects[$name]['download']); // PM is the default
    }
    $ignore = array('build_path', 'contrib_destination', 'core', 'make_directory', 'l10n_url', 'download_type');
    foreach ($ignore as $key) {
      unset($projects[$name][$key]);
    }

    // Remove the location if it's the default.
    if ($projects[$name]['location'] == 'https://updates.drupal.org/release-history') {
      unset($projects[$name]['location']);
    }

    // Remove empty entries (e.g. 'directory_name')
    $projects[$name] = _make_generate_array_filter($projects[$name]);
  }

  $libraries = drush_get_option('DRUSH_MAKE_LIBRARIES', FALSE);
  if ($libraries === FALSE) {
    $libraries = isset($info['libraries']) ? $info['libraries'] : array();
  }
  if (is_array($libraries)) {
    foreach ($libraries as $name => $library) {
      $libraries[$name]['type'] = 'library';
      $libraries[$name]['_type'] = 'librarie';

      if ($library['download']['type'] == 'git') {
        drush_make_resolve_git_refs($libraries[$name]);
      }
    }
  }

  $contents = make_generate_makefile_contents($projects, $libraries, $core, $defaults);

  // Write or print our makefile.
  $file = $file !== TRUE ? $file : NULL;
  make_generate_print($contents, $file);
}

/**
 * Resolve branches and revisions for git-based projects.
 */
function drush_make_resolve_git_refs(&$project) {
  if (!isset($project['download']['branch'])) {
    $project['download']['branch'] = drush_make_resolve_git_branch($project);
  }
  if (!isset($project['download']['revision'])) {
    $project['download']['revision'] = drush_make_resolve_git_revision($project);
  }
}

/**
 * Resolve branch for a git-based project.
 */
function drush_make_resolve_git_branch($project) {
  drush_log(dt('Resolving default branch for repo at: :repo', array(':repo' => $project['download']['url'])));
  if (drush_shell_exec("git ls-remote %s HEAD", $project['download']['url'])) {
    $head_output = drush_shell_exec_output();
    list($head_commit) = explode("\t", $head_output[0]);

    drush_log(dt('Scanning branches in repo at: :repo', array(':repo' => $project['download']['url'])));
    drush_shell_exec("git ls-remote --heads %s", $project['download']['url']);
    $heads_output = drush_shell_exec_output();
    $branches = array();
    foreach ($heads_output as $key => $head) {
      list($commit, $ref) = explode("\t", $head);
      $branches[$commit] = explode("/", $ref)[2];
    }

    $branch = $branches[$head_commit];
    drush_log(dt('Resolved git branch to: :branch', array(':branch' => $branch)));
    return $branch;
  }
  else {
    drush_log(dt('Could not resolve branch for `:project` using git repo at :repo', array(':project' => $project['name'], ':repo' => $project['download']['url'])), 'warning');
  }
}

/**
 * Resolve revision for a git-based project.
 */
function drush_make_resolve_git_revision($project) {
  drush_log(dt('Resolving head commit on `:branch` branch for repo at: :repo', array(':branch' => $project['download']['branch'], ':repo' => $project['download']['url'])));
  if (drush_shell_exec("git ls-remote %s %s", $project['download']['url'], $project['download']['branch'])) {
    $head_output = drush_shell_exec_output();
    list($revision) = explode("\t", $head_output[0]);
    drush_log(dt('Resolved git revision to: :revision', array(':revision' => $revision)));
    return $revision;
  }
  else {
    drush_log(dt('Could not resolve head commit for `:project` using git repo at :repo', array(':project' => $project['name'], ':repo' => $project['download']['url'])), 'warning');
  }
}

/**
 * Generate makefile contents in the appropriate format.
 */
function make_generate_makefile_contents($projects,  $libraries = array(), $core = NULL, $defaults = array()) {
  $format = drush_get_option('format', 'yaml');
  $func = "make_generate_makefile_contents_$format";
  if (function_exists($func)) {
    $contents = call_user_func($func, $projects, $libraries, $core, $defaults);
  }
  else {
    return drush_set_error('MAKE_UNKNOWN_OUTPUT_FORMAT', dt('Generating makefiles in the :format output format is not yet supported. Implement :func() to add such support.', array(':format' => $format, ':func' => $func)));
  }
  return $contents;
}

/**
 * Generate makefile contents in (legacy) INI format.
 */
function make_generate_makefile_contents_ini($projects, $libraries, $core, $defaults) {
  return _drush_make_generate_makefile_contents($projects, $libraries, $core, $defaults);
}

/**
 * Generate makefile contents in YAML format.
 */
function make_generate_makefile_contents_yaml($projects, $libraries, $core, $defaults) {
  $info = array(
    'core' => $core,
    'api' => MAKE_API,
    'defaults' => $defaults,
    'projects' => $projects,
    'libraries' => $libraries,
  );

  $info = _make_generate_array_filter($info);
  $info = _make_generate_array_filter_key('_type', $info);
  $dumper = drush_load_engine('outputformat', 'yaml');
  $yaml = $dumper->format($info, array());

  return $yaml;
}

/**
 * Helper function to recursively remove empty values from an array (but not
 * '0'!).
 */
function _make_generate_array_filter($haystack) {
  foreach ($haystack as $key => $value) {
    if (is_array($value)) {
      $haystack[$key] = _make_generate_array_filter($haystack[$key]);
    }
    if (empty($value) && $value !== '0') {
      unset($haystack[$key]);
    }
  }
  return $haystack;
}

/**
 * Helper function to recursively remove elements matching a specific key from an array.
 */
function _make_generate_array_filter_key($needle, $haystack) {
  foreach ($haystack as $key => $value) {
    if ($key === $needle) {
      unset($haystack[$key]);
    }
    elseif (is_array($value)) {
      $haystack[$key] = _make_generate_array_filter_key($needle, $haystack[$key]);
    }
  }
  return $haystack;
}

/**
 * Print the generated makefile to the terminal, or write it to a file.
 *
 * @param $contents
 *   The formatted contents of a makefile.
 * @param $file
 *   (optional) The path to write the makefile.
 */
function make_generate_print($contents, $file = NULL) {
  if (!$file) {
    drush_print($contents);
  }
  elseif (file_put_contents($file, $contents)) {
    drush_log(dt("Wrote .make file @file", array('@file' => $file)), LogLevel::OK);
  }
  else {
    make_error('FILE_ERROR', dt("Unable to write .make file !file", array('!file' => $file)));
  }
}

/**
 * Utility function to generate the line or lines for a key/value pair in the
 * make file.
 *
 * @param $base
 *   The base for the configuration lines. Values will be appended to it as
 *   [$key] = $value, or if value is an array itself it will expand into as many
 *   lines as required.
 * @param $values
 *   May be a single value or an array.
 * @return
 *   An array of strings that represent lines for the make file.
 */
function _drush_make_generate_lines($base, $values) {
  $output = array();

  if (is_array($values)) {
    foreach ($values as $key => $value) {
      $newbase = $base . '[' . $key . ']';
      $output = array_merge($output, _drush_make_generate_lines($newbase, $value));
    }
  }
  else {
    $output[$base] = '"' . $values . '"';
  }

  return $output;
}

function _drush_make_generate_defaults($defaults, &$output = array()) {
  $output[] = '; Defaults';
  foreach ($defaults as $name => $project) {
    $type = 'defaults';
    if (!$project && is_string($name)) {
      $output[] = $type . '[] = "' . $name . '"';
      continue;
    }
    $base = $type . '[' . $name . ']';

    $output = array_merge($output, _drush_make_generate_lines($base, $project));
  }
}