<?php

/**
 * @file
 * JQuery Colorpicker primary module file.
 */

/**
 * Implements of hook_permission().
 */
function jquery_colorpicker_permission() {
  return array(
    'administer jquery colorpicker' => array(
      'title' => t('Administer jQuery colorpicker'),
      'description' => t('Allows users to administer the settings for the jQuery colorpicker'),
    ),
  );
}

/**
 * API function to validate colors. This function is used anywhere the
 * value of a jquery_colorpicker element is used, to ensure consistency
 * in checking and in language.
 *
 * @param string $color
 *   The color to be validated.
 *
 * @return array
 *   The return value will be an array with one or two keys:
 *   - color (always returned): contains the validated color. This is returned
 *     as color values prefixed with the # symbol are allowed, but the symbol
 *     will be removed to ensure consistency in saving.
 *   - error (only returned if there is an error): Contains the error for the color.
 */
function jquery_colorpicker_validate_color($color) {
  $results = array('color' => $color);
  if (strlen($color)) {
    if (preg_match('/^#/', $color)) {
      $color = substr($color, 1);
    }

    $results['color'] = $color;

    // All values must be 6 characters in length (will probably add support for 3 character definitions and predifined colors in version 2
    if (strlen($color) != 6) {
      $results['error'] = t('Color values must be exactly six characters in length');
    }
    // All values must be hexadecimal values.
    elseif (!preg_match('/^[0-9a-f]{6}$/i', $color)) {
      $results['error'] = t("You entered an invalid value for the color. Colors must be hexadecimal, and can only contain the characters '0' to '9' and 'a' to 'f'.");
    }
  }

  return $results;
}

/**
 * Implements hook_elements().
 */
function jquery_colorpicker_element_info() {
  // This is the definition for the new form API element.
  return array(
    'jquery_colorpicker' => array(
      '#input' => TRUE,
      '#element_validate' => array('jquery_colorpicker_validate'),
      '#jquery_colorpicker_background' => 'select.png',
      '#process' => array('ajax_process_form', 'jquery_colorpicker_process_element'),
      '#theme' => 'jquery_colorpicker',
      '#theme_wrappers' => array('form_element'),
    ),
  );
}

/**
 * Callback function to process jquery_colorpicker elements
 *
 * @see jquery_colorpicker_element_info()
 */
function jquery_colorpicker_process_element($element, &$form_state) {
  $element['#id'] = drupal_html_id('edit-' . implode('-', $element['#parents']));
  $library_path = libraries_get_path('colorpicker');

  // Decide what background to use to render the element. In order to ensure the background exists, we create an array of
  // the two possibilities, that we will use to compare the value submitted in the Form API definition.
  $backgrounds = array('select.png', 'select2.png');
  // Now we check to see if the value in the Form API definition is valid. If it is, we use it, if it's not, we use a default value.
  $background = (in_array($element['#jquery_colorpicker_background'], $backgrounds)) ? $element['#jquery_colorpicker_background'] : 'select.png';
  // Since we know the background, we can then get the URL of it to pass to the javascript function.
  $background_url = file_create_url($library_path . '/images/' . $background);

  // Attach the 3rd party CSS and JS files, and attach the module's JS files.
  $element['#attached'] = array(
    'css' => array(
      // Add the 3rd party CSS files required for the form elmeent.
      $library_path . '/css/colorpicker.css',
    ),
    'js' => array(
      // Add the 3rd party JS files required for the form element.
      $library_path . '/js/colorpicker.js',
      // Add the module js files.
      drupal_get_path('module', 'jquery_colorpicker') . '/js/jquery_colorpicker.js',
    ),
  );

  // And we pass the settings in a namespace to the Javascript.
  $element['#attached']['js'][] = array(
    'data' => array('jqueryColorpicker' => array($element['#id'] => $background_url)),
    'type' => 'setting',
  );

  return $element;
}

/**
 * Implements hook_theme().
 */
function jquery_colorpicker_theme() {
  return array(
    'jquery_colorpicker' => array(
      'render element' => 'element',
    ),
    'jquery_colorpicker_color_display' => array(
      'variables' => array(
        'entity_id' => NULL,
        'instance_id' => NULL,
        'entity_delta' => NULL,
        'item' => NULL,
      ),
    ),
    'jquery_colorpicker_text_display' => array(
      'variables' => array('item' => NULL),
    ),
  );
}

/**
 * callback theme for the new form element
 */
function theme_jquery_colorpicker($variables) {
  $element = $variables['element'];

  $class = array('form-colorpicker');
  $output = '';
  unset($element['#prefix']);
  unset($element['#suffix']);

  // Determine the default color for the form element
  $default_color = "#ffffff";
  if (isset($element['#value']) && strlen($element['#value'])) {
    $default_color = '#' . $element['#value'];
  }
  elseif (isset($element['#default_value']) && strlen($element['#default_value']) == 6 && preg_match('/^[0-9a-f]{6}$/i', $element['#default_value'])) {
    $default_color = '#' . strtolower($element['#default_value']);
  }

  // Over the next few lines we build the output of the element in HTML and to send to the browser.
  _form_set_class($element, $class);

  $name = isset($element['#name']) ? $element['#name'] : $element['#id'];
  $value = isset($element['#value']) ? check_plain($element['#value']) : '';
  if (preg_match('/^#/', $value)) {
    $value = substr($value, 1);
  }

  $output .= '<div class="jquery_colorpicker">';
  $output .= '<div id="' . $element['#id'] . '-inner_wrapper" class="inner_wrapper">';
  $output .= '<div class="color_picker" style="background-color:' . $default_color . '">';
  $output .= '<span class="hash">#</span>';
  $output .= '<input type="text"' . ' maxlength="7"' . ' name="' . $name . '" id="' . $element['#id'] . '"' . ' size="7"' . ' value="' . $value . '"' . drupal_attributes($element['#attributes']) . ' />';
  $output .= '<div class="description">' . t('Enter a hexidecimal color value. Enabling javascript will replace this input with a graphical color selector.') . '</div>';
  $output .= '</div>';
  $output .= '</div>';
  if (isset($element['#cardinality'])) {
    if ($element['#cardinality'] == FIELD_CARDINALITY_UNLIMITED) {
      $output .= '<div>' . l(t('Remove'), '#', array('attributes' => array('class' => array('jquery_colorpicker_field_remove_link')))) . '</div>';
    }
    else {
      $output .= '<div>' . l(t('Clear'), '#', array('attributes' => array('class' => array('jquery_colorpicker_field_clear_link')))) . '</div>';
    }
  }
  $output .= '</div>';

  return $output;
}

/**
 * Validation function for the form element
 */
function jquery_colorpicker_validate($element, &$form_state) {
  $results = jquery_colorpicker_validate_color($element['#value']);
  form_set_value($element, $results['color'], $form_state);

  if(isset($results['error'])) {
    form_error($element, $results['error']);
  }
}

/**
 * Implements hook_field_info().
 */
function jquery_colorpicker_field_info() {
  return array(
    'jquery_colorpicker' => array(
      'label' => t('jQuery Colorpicker'),
      'description' => t('A colorpicker pop that uses the jQuery Colorpicker'),
      'default_widget' => 'jquery_colorpicker',
      'default_formatter' => 'jquery_colorpicker_color_display',
      'property_type' => 'text',
    ),
  );
}

/**
 * Implements hook_field_is_empty().
 */
function jquery_colorpicker_field_is_empty($item, $field) {
  return empty($item['jquery_colorpicker']);
}

/**
 * Implements hook_field_formatter_info().
 */
function jquery_colorpicker_field_formatter_info() {
  return array(
    'jquery_colorpicker_color_display' => array(
      'label' => t('Colored block'),
      'field types' => array('jquery_colorpicker'),
    ),
    'jquery_colorpicker_text_display' => array(
      'label' => t('Text'),
      'field types' => array('jquery_colorpicker'),
    ),
    'jquery_colorpicker_raw_hex_display' => array(
      'label' => t('Raw hex'),
      'field types' => array('jquery_colorpicker'),
    ),
  );
}

/**
 * Implements hook_field_formatter_view().
 */
function jquery_colorpicker_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {
  $css_attachment_cache = &drupal_static(__FUNCTION__ . '_css');
  if (!isset($css_attachment_cache)) {
    $css_attachment_cache = array();
  }

  $element = array();
  foreach ($items as $delta => $item) {
    switch ($display['type']) {
      case 'jquery_colorpicker_color_display':
        list($id, , ) = entity_extract_ids($entity_type, $entity);
        $element[$delta] = array(
          '#theme' => 'jquery_colorpicker_color_display',
          '#entity_id' => $id,
          '#instance_id' => $instance['id'],
          '#entity_delta' => $delta,
          '#item' => $item['jquery_colorpicker'],
          '#attached' => array(
            'css' => array(
              array(
                'type' => 'inline',
                'data' => '.jquery_colorpicker_color_display_' . $instance['id'] . '_' . $delta . '_' . $item['jquery_colorpicker'] . '{background-color:#' . $item['jquery_colorpicker'] . ';}',
              )
            )
          )
        );
        break;

      case 'jquery_colorpicker_text_display':
        $element[$delta] = array(
          '#theme' => 'jquery_colorpicker_text_display',
          '#item' => $item['jquery_colorpicker'],
        );
        break;

      case 'jquery_colorpicker_raw_hex_display':
        $element[$delta]['#markup'] = $item['jquery_colorpicker'];
        break;
    }
  }
  return $element;
}

/**
 * Implements hook_field_widget_info().
 */
function jquery_colorpicker_field_widget_info() {
  return array(
    'jquery_colorpicker' => array(
      'label' => t('jQuery Colorpicker'),
      'field types' => array('jquery_colorpicker'),
    ),
  );
}

/**
 * Implements hook_widget_form().
 */
function jquery_colorpicker_field_widget_form(&$form, &$form_state, $field, $instance, $langcode, $items, $delta, $element) {
  $value = '';
  if (isset($instance['default_value'][$delta]['jquery_colorpicker'])) {
    $value = $instance['default_value'][$delta]['jquery_colorpicker'];
  }
  if (isset($items[$delta]['jquery_colorpicker'])) {
    $value = $items[$delta]['jquery_colorpicker'];
  }
  $element += array(
    '#delta' => $delta,
  );
  $element['jquery_colorpicker'] = array();
  if ($instance['widget']['type'] == 'jquery_colorpicker') {
    $element['jquery_colorpicker'] += array(
      '#title' => $instance['label'],
      '#type' => 'jquery_colorpicker',
      '#default_value' => $value,
      '#cardinality' => $field['cardinality'],
      '#description' => $element['#description'],
    );
  }
  return $element;
}

/**
 * Function that implements theme_jquery_colorpicker_color_display
 */
function theme_jquery_colorpicker_color_display($variables) {
  return '<div id ="jquery_colorpicker_color_display_' . $variables['entity_id'] . '_' . $variables['instance_id'] . '_' . $variables['entity_delta'] . '" class="jquery_colorpicker_color_display jquery_colorpicker_color_display_' . $variables['instance_id'] . ' jquery_colorpicker_color_display_' . $variables['instance_id'] . '_' . $variables['entity_delta'] . '_' . $variables['item'] . '">&nbsp;</div>';
}

/**
 * Function that implements theme_jquery_colorpicker_text_display
 */
function theme_jquery_colorpicker_text_display($variables) {
  return '<div class="jquery_colorpicker_text_display"><span class="jquery_colorpicker_hash_mark">#</span>' . $variables['item'] . '</div>';
}