<?php

use Drush\Log\LogLevel;

/*
 * Notes:
 * - Drush is required on source and dest (except with --no-dump)
 * - Source and Dest can both be remote. Convenient.
 * - No special handling for multiple targets. Use --no-dump.
 * - We could move the sanitize confirmations earlier if desired.
 * - A bit tricky to know where to put your drushrc/alias customizations. Can be local, $source, or $destination. Just add docs?
 * - No longer optimizing for efficient rsync. We could add this back if desired.
 *   -- Always use gzip during sql-dump. Don't use --ordered-dump.
 *   -- No more 24-hour freshness check for a team of devs.
 * - Can we now simplify anything in sitealias.inc or backend.inc?
 */

/**
 * Implementation of hook_drush_command().
 */
function sqlsync_drush_command() {
  $items['sql-sync'] = array(
    'description' => 'Copies the database contents from a source site to a target site. Transfers the database dump via rsync.',
    'bootstrap' => DRUSH_BOOTSTRAP_NONE,
    'drush dependencies' => array('sql', 'core'), // core-rsync.
    'package' => 'sql',
    'examples' => array(
      'drush sql-sync @source @target' => 'Copy the database from the site with the alias "source" to the site with the alias "target".',
      'drush sql-sync prod dev' => 'Copy the database from the site in /sites/prod to the site in /sites/dev (multisite installation).',
    ),
    'arguments' => array(
      'source' => 'A site-alias or the name of a subdirectory within /sites whose database you want to copy from.',
      'target' => 'A site-alias or the name of a subdirectory within /sites whose database you want to replace.',
    ),
    'required-arguments' => TRUE,
    'options' => array(
      'skip-tables-key' => 'A key in the $skip_tables array. See example.drushrc.php. Optional.',
      'skip-tables-list' => 'A comma-separated list of tables to exclude completely. Optional.',
      'structure-tables-key' => 'A key in the $structure_tables array. See example.drushrc.php. Optional.',
      'structure-tables-list' => 'A comma-separated list of tables to include for structure, but not data. Optional.',
      'tables-key' => 'A key in the $tables array. Optional.',
      'tables-list' => 'A comma-separated list of tables to transfer. Optional.',
      // 'cache' => 'Skip dump if result file exists and is less than "cache" hours old. Optional; default is 24 hours.',
      // 'no-cache' => 'Do not cache the sql-dump file.',
      'no-dump' => 'Do not dump the sql database; always use an existing dump file.',
      'no-sync' => 'Do not rsync the database dump file from source to target.',
      'runner' => 'Where to run the rsync command; defaults to the local site. Can also be "source" or "destination".',
      'source-db-url' => 'Database specification for source system to dump from.',
      'source-remote-port' => 'Override sql database port number in source-db-url. Optional.',
      'source-remote-host' => 'Remote machine to run sql-dump file on. Optional; default is local machine.',
      'source-dump' => 'The destination for the dump file, or the path to the dump file when --no-dump is specified.',
      'source-database' => 'A key in the $db_url (D6) or $databases (D7+) array which provides the data.',
      'source-target' => array(
        'description' => 'A key within the SOURCE database identifying a particular server in the database group.',
        'example-value' => 'key',
        // Gets unhidden in help_alter(). We only want to show to D7+ users but have to
        // declare it here since this command does not bootstrap fully.
        'hidden' => TRUE,
      ),
      'target-db-url' => '',
      'target-remote-port' => '',
      'target-remote-host' => '',
      'target-dump' => 'A path for saving the dump file on target. Mandatory when using --no-sync.',
      'target-database' => 'A key in the $db_url (D6) or $databases (D7+) array which shall receive the data.',
      'target-target' => array(
        'description' => 'Oy. A key within the TARGET database identifying a particular server in the database group.',
        'example-value' => 'key',
        // Gets unhidden in help_alter(). We only want to show to D7+ users but have to
        // declare it here since this command does not bootstrap fully.
        'hidden' => TRUE,
      ),
      'create-db' => 'Create a new database before importing the database dump on the target machine.',
      'db-su' => array(
        'description' => 'Account to use when creating a new database. Optional.',
        'example-value' => 'root',
      ),
      'db-su-pw' => array(
        'description' => 'Password for the "db-su" account. Optional.',
        'example-value' => 'pass',
      ),
      // 'no-ordered-dump' => 'Do not pass --ordered-dump to sql-dump.  sql-sync orders the dumpfile by default in order to increase the efficiency of rsync.',
      'sanitize' => 'Obscure email addresses and reset passwords in the user table post-sync.',
    ),
    'sub-options' => array(
      'sanitize' => drupal_sanitize_options() + array(
          'confirm-sanitizations' => 'Prompt yes/no after importing the database, but before running the sanitizations',
        ),
    ),
    'topics' => array('docs-aliases', 'docs-policy', 'docs-example-sync-via-http', 'docs-example-sync-extension'),
  );
  return $items;
}

/**
 * Implements hook_drush_help_alter().
 */
function sqlsync_drush_help_alter(&$command) {
  // Drupal 7+ only options.
  if (drush_drupal_major_version() >= 7) {
    if ($command['command'] == 'sql-sync') {
      unset($command['options']['source-target']['hidden'], $command['options']['target-target']['hidden']);
    }
  }
}

/**
 * Command argument complete callback.
 *
 * @return
 *  Array of available site aliases.
 */
function sql_sql_sync_complete() {
  return array('values' => array_keys(_drush_sitealias_all_list()));
}

/*
 * Implements COMMAND hook init.
 */
function drush_sql_sync_init($source, $destination) {
  // Try to get @self defined when --uri was not provided.
  drush_bootstrap_max(DRUSH_BOOTSTRAP_DRUPAL_SITE);

  // Preflight destination in case it defines the alias used by the source
  _drush_sitealias_get_record($destination);

  // After preflight, get source and destination settings
  $source_settings = drush_sitealias_get_record($source);
  $destination_settings = drush_sitealias_get_record($destination);

  // Apply command-specific options.
  drush_sitealias_command_default_options($source_settings, 'source-');
  drush_sitealias_command_default_options($destination_settings, 'target-');
}

/*
 * A command validate callback.
 */
function drush_sqlsync_sql_sync_validate($source, $destination) {
  // Get destination info for confirmation prompt.
  $source_settings = drush_sitealias_overlay_options(drush_sitealias_get_record($source), 'source-');
  $destination_settings = drush_sitealias_overlay_options(drush_sitealias_get_record($destination), 'target-');
  $source_db_url = drush_sitealias_get_db_spec($source_settings, FALSE, 'source-');
  $target_db_url = drush_sitealias_get_db_spec($destination_settings, FALSE, 'target-');
  $txt_source = (isset($source_db_url['remote-host']) ? $source_db_url['remote-host'] . '/' : '') . $source_db_url['database'];
  $txt_destination = (isset($target_db_url['remote-host']) ? $target_db_url['remote-host'] . '/' : '') . $target_db_url['database'];

  // Validate.
  if (empty($source_db_url)) {
    if (empty($source_settings)) {
      return drush_set_error('DRUSH_ALIAS_NOT_FOUND', dt('Error: no alias record could be found for source !source', array('!source' => $source)));
    }
    return drush_set_error('DRUSH_DATABASE_NOT_FOUND', dt('Error: no database record could be found for source !source', array('!source' => $source)));
  }
  if (empty($target_db_url)) {
    if (empty($destination_settings)) {
      return drush_set_error('DRUSH_ALIAS_NOT_FOUND', dt('Error: no alias record could be found for target !destination', array('!destination' => $destination)));
    }
    return drush_set_error('DRUSH_DATABASE_NOT_FOUND', dt('Error: no database record could be found for target !destination', array('!destination' => $destination)));
  }
  if (isset($source_db_url['remote-host']) && isset($target_db_url['remote-host']) && ($source_db_url['remote-host'] == $target_db_url['remote-host']) && ($source_db_url['database'] == $target_db_url['database']) && !drush_get_context('DRUSH_SIMULATE')) {
    return drush_set_error('DRUSH_SAME_DATABASE', dt('Source and target databases are the same; please sync to a different target.'));
  }

  if (drush_get_option('no-dump') && !drush_get_option('source-dump')) {
    return drush_set_error('DRUSH_SOURCE_DUMP_MISSING', dt('The --source-dump option must be supplied when --no-dump is specified.'));
  }

  if (drush_get_option('no-sync') && !drush_get_option('target-dump')) {
    return drush_set_error('DRUSH_TARGET_DUMP_MISSING', dt('The --target-dump option must be supplied when --no-sync is specified.'));
  }

  if (!drush_get_context('DRUSH_SIMULATE')) {
    drush_print(dt("You will destroy data in !target and replace with data from !source.", array('!source' => $txt_source, '!target' => $txt_destination)));
    // @todo Move sanitization prompts to here. They currently show much later.
    if (!drush_confirm(dt('Do you really want to continue?'))) {
      return drush_user_abort();
    }
  }
}

/*
 * A command callback.
 */
function drush_sqlsync_sql_sync($source, $destination) {
  $source_settings = drush_sitealias_overlay_options(drush_sitealias_get_record($source), 'source-');
  $destination_settings = drush_sitealias_overlay_options(drush_sitealias_get_record($destination), 'target-');
  $source_is_local = !array_key_exists('remote-host', $source_settings) || drush_is_local_host($source_settings);
  $destination_is_local = !array_key_exists('remote-host', $destination_settings) || drush_is_local_host($destination_settings);

  // These options are passed along to subcommands like sql-create, sql-dump, sql-query, sql-sanitize, ...
  $source_options = drush_get_merged_prefixed_options('source-');
  $target_options = drush_get_merged_prefixed_options('target-');

  $backend_options = array();
  // @todo drush_redispatch_get_options() assumes you will execute same command. Not good.
  $global_options = drush_redispatch_get_options() + array(
     'strict' => 0,
  );
  // We do not want to include root or uri here.  If the user
  // provided -r or -l, their key has already been remapped to
  // 'root' or 'uri' by the time we get here.
  unset($global_options['root']);
  unset($global_options['uri']);

  if (drush_get_context('DRUSH_SIMULATE')) {
    $backend_options['backend-simulate'] = TRUE;
  }

  // Create destination DB if needed.
  if (drush_get_option('create-db')) {
    drush_log(dt('Starting to create database on Destination.'), LogLevel::OK);
    $return = drush_invoke_process($destination, 'sql-create', array(), $global_options + $target_options, $backend_options);
    if ($return['error_status']) {
      return drush_set_error('DRUSH_SQL_CREATE_FAILED', dt('sql-create failed.'));
    }
  }

  // Perform sql-dump on source unless told othrwise.
  $options = $global_options + $source_options + array(
    'gzip' => TRUE,
    'result-file' => drush_get_option('source-dump', TRUE),
    // 'structure-tables-list' => 'cache*', // Do we want to default to this?
  );
  if (!drush_get_option('no-dump')) {
    drush_log(dt('Starting to dump database on Source.'), LogLevel::OK);
    $return = drush_invoke_process($source, 'sql-dump', array(), $options, $backend_options);
    if ($return['error_status']) {
      return drush_set_error('DRUSH_SQL_DUMP_FAILED', dt('sql-dump failed.'));
    }
    else {
      $source_dump_path = $return['object'];
      if (!is_string($source_dump_path)) {
        return drush_set_error('DRUSH_SQL_DUMP_FILE_NOT_REPORTED', dt('The Drush sql-dump command did not report the path to the dump file produced.  Try upgrading the version of Drush you are using on the source machine.'));
      }
    }
  }
  else {
    $source_dump_path = drush_get_option('source-dump');
  }

  $do_rsync = !drush_get_option('no-sync');
  // Determine path/to/dump on destination.
  if (drush_get_option('target-dump')) {
    $destination_dump_path = drush_get_option('target-dump');
    $rsync_options['yes'] = TRUE;  // @temporary: See https://github.com/drush-ops/drush/pull/555
  }
  elseif ($source_is_local && $destination_is_local) {
    $destination_dump_path = $source_dump_path;
    $do_rsync = FALSE;
  }
  else {
    $tmp = '/tmp'; // Our fallback plan.
    drush_log(dt('Starting to discover temporary files directory on Destination.'), LogLevel::OK);
    $return = drush_invoke_process($destination, 'core-status', array(), array(), array('integrate' => FALSE, 'override-simulated' => TRUE));
    if (!$return['error_status'] && isset($return['object']['drush-temp'])) {
      $tmp = $return['object']['drush-temp'];
    }
    $destination_dump_path = $tmp . '/' . basename($source_dump_path);
    $rsync_options['yes'] = TRUE;  // No need to prompt as destination is a tmp file.
  }

  if ($do_rsync) {
    if (!drush_get_option('no-dump')) {
      // Cleanup if this command created the dump file.
      $rsync_options['remove-source-files'] = TRUE;
    }
    $runner = drush_get_runner($source_settings, $destination_settings, drush_get_option('runner', FALSE));
    // Since core-rsync is a strict-handling command and drush_invoke_process() puts options at end, we can't send along cli options to rsync.
    // Alternatively, add options like --ssh-options to a site alias (usually on the machine that initiates the sql-sync).
    $return = drush_invoke_process($runner, 'core-rsync', array("$source:$source_dump_path", "$destination:$destination_dump_path"), $rsync_options);
    drush_log(dt('Copying dump file from Source to Destination.'), LogLevel::OK);
    if ($return['error_status']) {
      return drush_set_error('DRUSH_RSYNC_FAILED', dt('core-rsync failed.'));
    }
  }

  // Import file into destination.
  drush_log(dt('Starting to import dump file onto Destination database.'), LogLevel::OK);
  $options = $global_options + $target_options + array(
    'file' => $destination_dump_path,
    'file-delete' => TRUE,
  );
  $return = drush_invoke_process($destination, 'sql-query', array(), $options, $backend_options);
  if ($return['error_status']) {
    // An error was already logged.
    return FALSE;
  }

  // Run Sanitize if needed.
  $options = $global_options + $target_options;
  if (drush_get_option('sanitize')) {
    drush_log(dt('Starting to sanitize target database on Destination.'), LogLevel::OK);
    $return = drush_invoke_process($destination, 'sql-sanitize', array(), $options, $backend_options);
    if ($return['error_status']) {
      return drush_set_error('DRUSH_SQL_SANITIZE_FAILED', dt('sql-sanitize failed.'));
    }
  }
}
