<?php
/**
 * @file
 * Install, update and uninstall functions for the d3 module.
 */

/**
 * Implements hook_requirements().
 */
function d3_requirements($phase) {
  $requirements = array();
  // Run only for reporting.
  if ($phase != 'runtime') {
    return $requirements;
  }

  // If this is run during install we'll need to use get_t instead of just t.
  $t = get_t();
  // If the library directory exists.
  if ($path = libraries_get_path('d3')) {
    // Check for a d3 javascript file, ignoring the version and if it is
    // minified or not.
    if ($files = file_scan_directory($path, '/d3.*.js/')) {
      $requirements['d3'] = array(
        'title' => $t('D3'),
        'value' => '',
        'severity' => REQUIREMENT_OK,
      );

      // Return a list of all the files that exist.
      foreach ($files as $file) {
        $requirements['d3']['value'] .= $file->filename . ' ';
      }

      // Report has passed.
      $requirements['d3']['value'] .= $t('found under !path', array('!path' => $path));
    }
    else {
      // If there are no javascript files, then there was a problem
      // installing the library.
      $requirements['d3'] = array(
        'title' => $t('D3'),
        'value' => $t('The d3 library has not been installed properly. Check your folder
            !path and ensure your d3.[version].js file is located inside that
            folder, and not in a subfolder.', array('!path' => $path)),
        'severity' => REQUIREMENT_ERROR,
      );
    }

    return $requirements;
  }
  else {
    // If there is no library at all, chances are they have not downloaded
    // and tried installing D3 yet.
    $requirements['d3'] = array(
      'title' => $t('D3'),
      'value' => $t('D3 library was not found. !download the library and place all javascript
          files in a folder entitled "d3" located in your default libraries folder.
          E.g. If you download version 3 minified, it would be located
          in path/to/libraries/d3/d3.v3.min.js.', array('!download' => l($t('Download'), 'http://d3js.org/'))
      ),
      'severity' => REQUIREMENT_ERROR,
    );

    return $requirements;
  }
}

/**
 * Implements hook_uninstall().
 */
function d3_uninstall() {
  variable_del('d3_graphapi_default_library');
}