<?php

/**
 * @file
 * Install and uninstall functions for the Simplenews Scheduler module.
 */

/**
 * Implements hook_schema().
 */
function simplenews_scheduler_schema() {
  $schema['simplenews_scheduler'] = array(
    'description' => 'Scheduled newsletter data.',
    'fields' => array(
      'nid' => array(
        'description' => 'The node id for a scheduled newsletter.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'last_run' => array(
        'description' => 'The timestamp the scheduled newsletter was last sent.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'next_run' => array(
        'description' => 'The future timestamp the next scheduled newsletter is due to be sent.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'activated' => array(
        'description' => 'Whether the schedule is active.',
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 0,
      ),
      'send_interval' => array(
        'description' => 'The interval at which to send, as a text string.',
        'type' => 'varchar',
        'length' => 10,
      ),
      'interval_frequency' => array(
        'description' => 'The number of intervals between newsletter transmission.',
        'type' => 'int',
        'default' => 1,
        'not null' => TRUE,
      ),
      'start_date' => array(
        'description' => 'The timestamp at which to start sending editions.',
        'type' => 'int',
        'not null' => TRUE,
      ),
      'stop_type' => array(
        'description' => 'How to determine when to stop sending editions.',
        'type' => 'int',
        'not null' => TRUE,
      ),
      'stop_date' => array(
        'description' => 'The timestamp at which to stop sending editions.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 1388447999,
      ),
      'stop_edition' => array(
        'description' => 'The edition count at which to stop sending editions.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'php_eval' => array(
        'description' => 'PHP code to evaluate to determine whether to send an edition.',
        'type' => 'blob',
        'not null' => TRUE,
      ),
      'title' => array(
        'description' => 'The title of new edition nodes.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
    ),
    'primary key' => array('nid'),
  );

  $schema['simplenews_scheduler_editions'] = array(
    'description' => 'Stores data for each edition of a scheduled newsletter.',
    'fields' => array(
      'eid' => array(
        'description' => 'The node id for the edition.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'pid' => array(
        'description' => 'The node id for the parent scheduled newsletter node.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'date_issued' => array(
        'description' => 'The timestamp on which this edition was sent.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
    ),
    'primary key' => array('eid'),
  );
  return $schema;
}

/**
 * Implementation of hook_uninstall().
 */
function simplenews_scheduler_uninstall() {
  drupal_uninstall_schema('simplenews_scheduler');
  drupal_uninstall_schema('simplenews_scheduler_editions');
}

/**
 * Implements hook_install().
 */
function simplenews_scheduler_install() {
  // Update the module weight to run before simplenews.
  db_update('system')
    ->condition('name', 'simplenews_scheduler')
    ->fields(array(
      'weight' => -1,
    ))
    ->execute();
}

/*
 * Implements hook_update_last_removed().
 */
function simplenews_scheduler_update_last_removed() {
  return 6005;
}

/**
 * Add the title field to the scheduler table.
 */
function simplenews_scheduler_update_7000() {

  if (!db_field_exists('simplenews_scheduler', 'title')) {
    $field = array(
      'description' => 'The title of new edition nodes.',
      'type' => 'varchar',
      'length' => 255,
      'not null' => TRUE,
      'default' => '',
      'initial' => '[node:title]',
    );
    db_add_field('simplenews_scheduler', 'title', $field);
  }
}

/**
 * Add the next_run field to the scheduler table and populate it.
 */
function simplenews_scheduler_update_7001() {
  // Only act if the field doesn't exist yet: this accounts for the possibility
  // it's been added in a 62xx update.
  if (!db_field_exists('simplenews_scheduler', 'next_run')) {
    // Add the field.
    $field = array(
      'description' => 'The future timestamp the next scheduled newsletter is due to be sent.',
      'type' => 'int',
      'not null' => TRUE,
      'default' => 0,
      'initial' => 0,
    );
    db_add_field('simplenews_scheduler', 'next_run', $field);

    // Populate the new field with each schedule's next run time.
    // Retrieve all records into an associative array keyed by nid.
    $schedules = db_query("SELECT * FROM {simplenews_scheduler}")->fetchAllAssoc('nid');
    foreach ($schedules as $nid => $schedule) {
      // Clear last_run to force the next_run calculation to work from the
      // start_date. This ensures that any error in previous edition dates due to
      // bugs with month length is ignored.
      // @see http://drupal.org/node/1364784
      $schedule->last_run = 0;

      // Get the next run time relative to the request time.
      $next_run = simplenews_scheduler_calculate_next_run_time($schedule, REQUEST_TIME);

      // Don't use drupal_write_record() in a hook_update_N().
      db_update('simplenews_scheduler')
        ->fields(array('next_run' => $next_run))
        ->condition('nid', $nid)
        ->execute();
    }
  }
}

/**
 * Update the module weight if it has not been customized.
 */
function simplenews_scheduler_update_7002() {
  // Update the module weight to run before simplenews.
  db_update('system')
    ->condition('name', 'simplenews_scheduler')
    // Only change the existing value if it has not been customized.
    ->condition('weight', 0)
    ->fields(array(
      'weight' => -1,
    ))
    ->execute();
}