<?php
/**
 * @file
 * Views style plugin for Visualization.
 */

/**
 * Style plugin uses views ui to configure views data for rendering charts.
 *
 * @ingroup views_style_plugins
 */
class visualization_plugin_style extends views_plugin_style {

  /**
   * Set default options.
   */
  public function option_definition() {
    $options = parent::option_definition();

    $options['title'] = array('default' => '');

    $options['type'] = array('default' => 'line');

    $options['fields'] = array('default' => array());

    $options['yAxis']['title'] = array('default' => '');

    $options['xAxis']['labelField'] = array('default' => FALSE);
    $options['xAxis']['invert'] = array('default' => FALSE);

    return $options;
  }

  /**
   * Returns the options form.
   */
  public function options_form(&$form, &$form_state) {
    parent::options_form($form, $form_state);

    $fields = $this->display->handler->get_field_labels();

    $form['title'] = array(
      '#type' => 'textfield',
      '#title' => t('Chart Title'),
      '#default_value' => $this->options['title'],
      '#description' => t('Enter a custom title for this chart.'),
    );

    $form['type'] = array(
      '#type' => 'select',
      '#title' => t('Chart type'),
      '#options' => array(
        'line' => 'Line chart',
        'pie' => 'Pie chart',
        'bar' => 'Bar chart',
        'column' => 'Column chart',
      ),
      '#default_value' => $this->options['type'],
      '#empty_value' => FALSE,
    );

    $form['fields'] = array(
      '#type' => 'fieldset',
      '#title' => t('Field settings'),
      '#collapsible' => TRUE,
      '#collapsed' => TRUE,
    );

    foreach ($fields as $field => $column) {
      $form['fields'][$field] = array(
        '#type' => 'fieldset',
        '#title' => check_plain($field),
        '#collapsible' => TRUE,
        '#collapsed' => empty($this->options['fields'][$field]),
      );

      $form['fields'][$field]['enabled'] = array(
        '#type' => 'checkbox',
        '#title' => t('Enable this field in the chart'),
        '#default_value' => $this->options['fields'][$field]['enabled'],
        '#dependency' => array('style_options', 'fields', $field, 'type'),
      );
    }

    $form['xAxis'] = array(
      '#type' => 'fieldset',
      '#title' => t('X-axis settings'),
      '#collapsible' => TRUE,
      '#collapsed' => !empty($this->options['xAxis']['labelField']) || !empty($this->options['xAxis']['invert']),
    );

    $form['xAxis']['labelField'] = array(
      '#type' => 'select',
      '#title' => t('X-axis labels'),
      '#options' => $fields,
      '#default_value' => $this->options['xAxis']['labelField'],
      '#empty_value' => FALSE,
    );

    $form['xAxis']['invert'] = array(
      '#type' => 'checkbox',
      '#title' => t('Should the x-axis get inverted?'),
      '#default_value' => $this->options['xAxis']['invert'],
    );

    $form['yAxis'] = array(
      '#type' => 'fieldset',
      '#title' => t('Y-axis settings'),
      '#collapsible' => TRUE,
      '#collapsed' => empty($this->options['yAxis']['title']),
    );

    $form['yAxis']['title'] = array(
      '#type' => 'textfield',
      '#title' => t('Y-axis title'),
      '#default_value' => $this->options['yAxis']['title'],
    );
  }

}