<?php

/**
 * @file
 *   Install file for Charts and Graphs module.
 *
 */

/**
 * Implements hook_uninstall().
 */
function charts_graphs_uninstall() {
  db_delete('variable')
  ->condition('name', 'charts_graphs_%%', 'LIKE')
  ->execute();
  cache_clear_all('variables', 'cache');
}

/**
 * Implements hook_requirements().
 */
function charts_graphs_requirements($phase) {
  $requirements = array();

  // Ensure translations don't break at install time.
  $t = get_t();

  if ($phase == 'runtime') {

    if (count(charts_graphs_apis()) == 0) {
      $requirements['charts_graphs_submodule'] = array(
        'title' => $t('Charts and Graphs charting library'),
        'description' => $t('Charts and Graphs requires at least one charting
          library enabled. Please go to !modules_page and enable at least one
          charting library.',
          array('!modules_page' => l(t('modules list page'), 'admin/modules/list'))
        ),
        'severity' => REQUIREMENT_ERROR,
        'value' => $t('None enabled'),
      );
    }

    if (variable_get('charts_graphs_check_chart_api', 1) && module_exists('chart')) {
      $requirements['charts_graphs_check_chart_api'] = array(
        'title' => $t('Chart API'),
        'description' => $t("You have both !charts_graphs and !chart_api
          installed. Unless you have different modules that require both the
          Charts and Graphs module and the Chart API module one of them
          should be uninstalled. A common module that requires Charts and
          Graphs is the Views Charts module so if you use the later, you need
          the first. If you don't want this warning to be shown any more, please
          set the proper option at !charts_graphs_settings_page.",
          array(
          '!charts_graphs' => l(
              t('Charts and Graphs'),
              'http://drupal.org/project/charts_graphs'
            ),
          '!chart_api' => l(
              t('Chart API'),
              'http://drupal.org/project/chart'
            ),
          '!charts_graphs_settings_page' => l(
              t('Charts and Graphs settings page'),
              'admin/config/charts_graphs'
            ),
        )
        ),
        'severity' => REQUIREMENT_ERROR,
        'value' => $t('Enabled'),
      );
    }

    if (variable_get('charts_graphs_check_charts', 1) && module_exists('charts')) {
      $requirements['charts_graphs_check_charts'] = array(
        'title' => $t('Charts'),
        'description' => $t("You have both !charts_graphs and !charts
          installed. Unless you have different modules that require both the
          Charts and Graphs module and the Charts module one of them
          should be uninstalled. A common module that requires Charts and
          Graphs is the Views Charts module so if you use the later, you need
          the first. If you don't want this warning to be shown any more, please
          set the proper option at !charts_graphs_settings_page.",
          array(
          '!charts_graphs' => l(
              t('Charts and Graphs'),
              'http://drupal.org/project/charts_graphs'
            ),
          '!charts' => l(
              t('Charts'),
              'http://drupal.org/project/charts'
            ),
          '!charts_graphs_settings_page' => l(
              t('Charts and Graphs settings page'),
              'admin/config/charts_graphs'
            ),
        )
        ),
        'severity' => REQUIREMENT_ERROR,
        'value' => $t('Enabled'),
      );
    }

  }

  return $requirements;
}