<?php

/**
 * @file
 * Installation file for i18n_string module.
 */

/**
 * Implements hook_enable().
 */
function i18n_string_enable() {
  // Refresh locales for enabled modules
  $modules = module_implements('i18n_string_refresh');
  i18n_string_modules_enabled($modules);
}

/**
 * Implements hook_install().
 */
function i18n_string_install() {
  // Add a field to track whether a translation needs updating.
  module_load_install('i18n');
  i18n_install_create_fields('locales_target', array('i18n_status'));
  // Set module weight for it to run after core modules.
  db_query("UPDATE {system} SET weight = 10 WHERE name = 'i18n_string' AND type = 'module'");
  // If updating from D6, module changed name
  if (variable_get('i18n_drupal6_update')) {
    i18n_string_update_7000();
  }
}

/**
 * Implements hook_uninstall().
 */
function i18n_string_uninstall() {
  // Drop custom field.
  db_drop_field('locales_target', 'i18n_status');
}

/**
 * Implements hook_schema().
 */
function i18n_string_schema() {
  $schema['i18n_string'] = array(
    'description' => 'Metadata for source strings.',
    'fields' => array(
      'lid' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Source string ID. References {locales_source}.lid.',
      ),
      'textgroup' => array(
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
        'default' => 'default',
        'description' => 'A module defined group of translations, see hook_locale().',
      ),
      'context' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Full string ID for quick search: type:objectid:property.',
      ),
      'objectid' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Object ID.',
      ),
      'type' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Object type for this string.',
      ),
      'property' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Object property for this string.',
      ),
      'objectindex' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Integer value of Object ID.',
      ),
      'format' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => FALSE,
        'description' => 'The {filter_format}.format of the string.',
      ),

    ),
    'primary key' => array('lid'),
    'indexes' => array(
      'group_context' => array('textgroup', 'context'),
    ),
  );
  return $schema;
}

/**
 * Implements hook_schema_alter().
 */
function i18n_string_schema_alter(&$schema) {
  // Add field for tracking whether translations need updating.
  $schema['locales_target']['fields']['i18n_status'] = array(
    'description' => 'A boolean indicating whether this translation needs to be updated.',
    'type' => 'int',
    'not null' => TRUE,
    'default' => 0,
  );
}

/**
 * Helper function to upate strings
 */
function i18n_string_install_update_string($string) {
  $string->context = $string->type . ':' . $string->objectid . ':' . $string->property;
  $string->location = $string->textgroup . ':' . $string->context;
  $string->objectindex = (int)$string->objectid;
  drupal_write_record('i18n_string', $string, 'lid');
  drupal_write_record('locales_source', $string, 'lid');
}

/**
 * Update context for strings.
 *
 * As some string locations depend on configurable values, the field needs sometimes to be updated
 * without losing existing translations. I.e:
 * - profile fields indexed by field name.
 * - content types indexted by low level content type name.
 *
 * Example:
 *  'profile:field:oldfield:*' -> 'profile:field:newfield:*'
 */
function i18n_string_install_update_context($oldname, $newname) {
  // Get context replacing '*' with empty string.
  $oldcontext = explode(':', $oldname);
  $newcontext = explode(':', $newname);
  /*
  i18n_string_context(str_replace('*', '', $oldname));
  $newcontext = i18n_string_context(str_replace('*', '', $newname));
  */
  // Get location with placeholders.
  foreach (array('textgroup', 'type', 'objectid', 'property') as $index => $field) {
    if ($oldcontext[$index] != $newcontext[$index]) {
      $replace[$field] = $newcontext[$index];
    }
  }

  // Query and replace if there are any fields. It is possible that under some circumstances fields are the same
  if (!empty($replace)) {
    $textgroup = array_shift($oldcontext);
    $context = str_replace('*', '%', implode(':', $oldcontext));
    $count = 0;
    $query = db_select('i18n_string', 's')
      ->fields('s')
      ->condition('s.textgroup', $textgroup)
      ->condition('s.context', $context, 'LIKE');

    foreach ($query->execute()->fetchAll() as $source) {
      foreach ($replace as $field => $value) {
        $source->$field = $value;
      }
      // Recalculate location, context, objectindex
      $source->context = $source->type . ':' . $source->objectid . ':' . $source->property;
      $source->location = $source->textgroup . ':' . $source->context;
      $source->objectindex = (int)$source->objectid;
      // Update source string.
      $update = array(
        'textgroup' => $source->textgroup,
        'context' => $source->context,
      );
      db_update('locales_source')
        ->fields($update + array('location' => $source->location))
        ->condition('lid', $source->lid)
        ->execute();

      // Update object data.
      db_update('i18n_string')
      ->fields($update + array(
        'type' => $source->type,
        'objectid' => $source->objectid,
        'property' => $source->property,
        'objectindex' => $source->objectindex,
      ))
      ->condition('lid', $source->lid)
      ->execute();
      $count++;
    }
    drupal_set_message(t('Updated @count string names from %oldname to %newname.', array('@count' => $count, '%oldname' => $oldname, '%newname' => $newname)));
  }
}

/**
 * Populate fields from old locale table (textgroup, location) and drop indexes from locales_source
 */
function i18n_string_update_7000() {
  // @todo Update from d6
  variable_del('i18nstrings_allowed_textgroups');
  // If we've got old table from D6, move data to new one
  if (db_table_exists('i18n_strings')) {
    db_query("INSERT INTO {i18n_string}(lid, objectid, type, property, objectindex, format) SELECT lid, objectid, type, property, objectindex, format FROM {i18n_strings}");
    // Update and populate textgroup field
    db_query("UPDATE {i18n_string} s SET s.textgroup = (SELECT l.textgroup FROM {locales_source} l WHERE l.lid = s.lid)");
    // Populate context field. We could use CONCAT_WS but I guess this is more standard.
    db_query("UPDATE {i18n_string} SET context = CONCAT(type, ':', objectid, ':', property)");
    db_query("UPDATE {locales_source} s INNER JOIN {i18n_string} i ON s.lid = i.lid SET s.context = i.context");
  }
}

/**
 * Rename i18n_strings table to i18n_string to avoid clashes when upgrading
 */
function i18n_string_update_7001() {
  db_rename_table('i18n_strings', 'i18n_string');
  drupal_get_schema(NULL, TRUE);
}

/**
 * Notes for update script
 */
// Added fields: context, textgroup
// 
// Drop all indexes from locales_source
// Update format field
// Update string names: profile, cck => field
// Update string names: 

/**
 * Old strings to update. All these will be handled by i18n_field module
 * 
 * 'cck:field:'. $content_type .'-'. $field_name .':widget_label'
 *  --> 'field:$field_name:$bundle:label' (though not used atm)
 * 'cck:field:'. $content_type .'-'. $field_name .':widget_description'
 *  --> 'field:$field_name:$bundle:description'
 * 'cck:fieldgroup:'. $content_type .'-'. $group_name .':display_description'
 * 'cck:fieldgroup:'. $content_type .'-'. $group_name .':form_description', $group['settings']['form']['description']); 
 * 
 * Profile:
 * profile:field:$field_name:title|explanation|options
 * "profile:category", $field->category
 * 
 * Node type
 *  nodetype:type:[type]:[property] -> node:type:[type]:[property]
 *  Property names: title -> title_label
 */