<?php

/**
 * @file
 * Plugin theme file.
 */
function template_preprocess_semantic_views(&$vars) {
  $options = $vars['options'];
  $view = $vars['view'];
  $fields = $view->get_items('field');
  $data = array();
  $highcharts_config = json_decode(file_get_contents(drupal_get_path("module", "highcharts_views") . '/defaults/bar-basic.json'));
  $highcharts_config->chart->defaultSeriesType = $options['format']['chart_type'];
  $highcharts_config->title->text = $options['format']['title'];
  $highcharts_config->subtitle->text = $options['format']['subtitle'];

  $highcharts_config->legend->enabled = $options['format']['legend_enabled'];
  if ($options['format']['chart_type']!= 'pie') {
    $highcharts_config->yAxis->title->text = $options['y_axis']['title'];
    $highcharts_config->yAxis->title->align = $options['y_axis']['title_align'];
    if ($options['x_axis']["reversed"] != FALSE) {
      $highcharts_config->xAxis->reversed = TRUE;
    }
    if ($options['y_axis']["reversed"] != FALSE) {
      $highcharts_config->yAxis->reversed = TRUE;
    }
    if ($options['format']['swap_axes'] != FALSE) {
      $highcharts_config->chart->inverted = TRUE;
    }
  }

  $highcharts_config->series = array();
  $highcharts_config->xAxis->categories = array();
  if (is_array($options)
    && is_array($options['x_axis']['dataset_data'])
    && is_array($fields)) {
    foreach ($options['x_axis']['dataset_data'] as $key) {
      if ($key != FALSE) {
        $vars['fields'][$key] = $fields[$key];
      }
    }
  }

  $highcharts_config->xAxis->categories = array();
  foreach ($view->style_plugin->render_tokens as $result_index => $row) {
    foreach ($row as $field_name => $field) {
      $f = str_replace(array('[',']'), '', $field_name);
      if ($options['x_axis']['dataset_data'][$f]) {
        $data[$f][] = (float)$field;
      }
    }
    if (!empty($options['x_axis']['dataset_label'])) {
      $highcharts_config->xAxis->categories[] = $row["[".$options['x_axis']['dataset_label']."]"];		
    }
  }
  if (function_exists("highcharts_series_" . $options['format']['chart_type'])) {
    // If there's a specialized data writer, return data from data writer.
    $highcharts_config->series = array(call_user_func("highcharts_views_series_".$options['format']['chart_type'], $data, $fields, $options));
  }
  else {
    // Get a standard series.
    $highcharts_config->series = highcharts_views_series($data, $vars['fields']);
  }

  // Render the chart options object, and retrieve the chart id.
  highcharts_render($highcharts_config);
  // Define required and optional chart container attributes.
  $attributes = array(
    // Required chart id passed by reference.
    'id' => $highcharts_config->chart->renderTo,
    // @todo add optional views config for styles or any other valid attribute.
    // Example: 'style' => 'height: 400px;'
  );

  $vars['attributes'] = $attributes;
}

/**
 * Standard highcharts views series data writer.
 *
 * @param array $data
 * @param array $fields
 *
 * @return
 *   The highcharts series data object.
 */
function highcharts_views_series($data, $fields) {
  $toReturn = array();

  foreach ($fields as $key => $field) {
    $item = new stdClass;
    $item->name = (array_key_exists("label", $field)) ? $field['label'] : $field['id'];
    $item->data = $data[$key];
    $toReturn[] = $item;
  }

  return $toReturn;
}

/**
 * Specialized pie highcharts views series data writer.
 *
 * @param array $data
 * @param array $fields
 * @param array $options
 *
 * @return
 *   The highcharts series data object.
 */
function highcharts_views_series_pie($data, $fields, $options) {
  $toReturn = new StdClass();
  $toReturn->type = $options['format']['chart_type'];
  $toReturn->name = $options['format']['title'];
  $toReturn->data = array();

  foreach ($fields as $key => $field) {
    $pie = 0;
    if (array_key_exists($key, $data)) {
      foreach($data[$key] as $value) {
        if (is_numeric($value)) {
          $pie += $value;
        }
      }
      $toReturn->data[] = array(
        array_key_exists("label", $field) ? $field['label'] : $field['id'],
        $pie,
      );
    }
  }

  return $toReturn;
}