<?php
// $Id: flot.module,v 1.2.2.7 2009-11-30 17:40:33 yhahn Exp $

/**
 * Implementation of hook_views_api().
 */
function flot_views_api() {
  return array(
    'api' => 2,
    'path' => drupal_get_path('module', 'flot') .'/views',
  );
}

/**
 * Implementation of hook_theme.
 */
function flot_theme() {
  return array(
    'flot_graph' => array(
      'arguments' => array('element' => array(), 'data' => array(), 'options' => array()),
    ),
  );
}

/**
 * Main flot graphing function
 *
 * @param $element
 *   An associative array to define a placeholder element. If an 'id' is 
 *   omitted one will be generated, If no 'style' is specified and width and
 *   height style will be added. In short you can just pass an empty array and
 *   everything will still work. This argument is essentially optional and has
 *   been kept as the first argument to remain consistant with flots own api.
 * @param $data
 *   The data series for the graph. Optional. See flot's API.txt for more 
 *   details. This module defines the flotData class which can  be used or
 *   extended to make generating data objects simpler.
 * @param $options
 *   Options to pass to flot. Optional. See flot's API.txt for more details.
 * @param $loader
 *   Allows alterative loading of flot data. If 'false' data will passed 
 *   directly to an invocation of $.plot(). Otherwise the contents of $loader
 *   should be js.
 *
 * @return
 *   The placeholder element
 */
function theme_flot_graph($element, $data = array(), $options = array(), $loader = false) {
  static $n;
  if (!isset($element['id'])) {
    $n++;
    $element['id'] = 'flot-auto-identifier-'. $n;
  }

  if (!isset($element['style'])) {
    $element['style'] = "width:100%;height:200px";
  }

  flot_add_js();

  if (count($data)) {
    $extra = '';
    $id = str_replace('-', '_', $element['id']);

    if ($loader) {
      $json_data = function_exists('json_encode') ? json_encode($data) : drupal_to_js($data);
      $extra = "Drupal.flot.{$id}_data = {$json_data}; {$loader}";
      $data = array();
    }

    $json_data = function_exists('json_encode') ? json_encode($data) : drupal_to_js($data);
    $json_options = function_exists('json_encode') ? json_encode($options) : drupal_to_js($options);
    $data = "if (Drupal.jsEnabled) {
      $(document).ready(function() {
        Drupal.flot.{$id} = $.plot($('#{$element['id']}'), {$json_data}, {$json_options});
        {$extra}
      });
    }";
    drupal_add_js($data, 'inline');
  }
  return '<div '. drupal_attributes($element) .'> </div>';
}

/**
 * Helper to add flot's js
 */
function flot_add_js() {
  static $added;
  if ($added !== true) {
    if (module_exists('libraries') && libraries_get_path('flot')) {
      $path = libraries_get_path('flot');
    }
    if (!isset($path)) {
      $path = drupal_get_path('module', 'flot') .'/flot';
    }

    // Different versions of flot have used different packing methods. Attempt to support both.
    $excanvas = file_exists("{$path}/excanvas.min.js") ? "{$path}/excanvas.min.js" : "{$path}/excanvas.pack.js";
    drupal_set_html_head('<!--[if IE]><script language="javascript" type="text/javascript" src="'. base_path() . $excanvas . '"></script><![endif]-->');
    drupal_add_js($path . '/jquery.flot.js');
    drupal_add_js('if (Drupal.jsEnabled) { Drupal.flot = {}; }', 'inline');

    $added = true;
  }
}

/**
* Data class for the flot API.
*
* Make some nested objects to keep things simple when creating a data series.
*/
class flotData {

  public $data;
  public $lines;
  public $bars;
  public $points;

  function __construct($data) {
    $this->data = $data;
    $this->lines = new stdClass();
    $this->bars = new stdClass();
    $this->points = new stdClass();
    $this->grid = new StdClass();
  }
}

/**
 * Style class for the flot API.
 *
 * Provides some sensible defaults and helper methods for managing axes.
 */
class flotStyle {
  public $colors;
  public $grid;
  public $lines;
  public $bars;
  public $points;

  function __construct() {
    $this->lines = new StdClass();
    $this->bars = new StdClass();
    $this->points = new StdClass();

    $this->lines->show = FALSE;
    $this->bars->show = FALSE;
    $this->points->show = FALSE;

    $this->colors = array('#666', '#999', '#ccc');
    $this->shadowSize = 0;

    $this->grid = new StdClass();
    $this->grid->labelMargin = 0;
    $this->grid->tickColor = '#eee';
    $this->grid->backgroundColor = '#f8f8f8';
    $this->grid->borderWidth = 0;
    $this->grid->hoverable = true;
    $this->grid->autoHighlight = true;
    $this->grid->clickable = false;
  }

  function axis_ticks($axis = 'yaxis', $ticks = array()) {
    if (count($ticks)) {
      $this->{$axis} = new StdClass();
      $this->{$axis}->ticks = $ticks;
    }
  }

  function axis_range($axis = 'yaxis', $range = array(), $granularity = 0) {
    if (count($range)) {
      $this->{$axis} = new StdClass();
      $this->{$axis}->min = min($range);
      $this->{$axis}->max = max($range);

      if (is_numeric($granularity) && $granularity != 0) {
        $tickSize = ($this->{$axis}->max - $this->{$axis}->min) / $granularity;
        $this->{$axis}->tickSize = floor($tickSize);
      }
    }
  }
}

/**
 * Basic line style class for the flot.
 */
class flotStyleLine extends flotStyle {
  function __construct() {
    parent::__construct();
    $this->lines->show = TRUE;
    $this->lines->lineWidth = 1;
    $this->lines->fill = .1;
  }
}

/**
 * Basic bar style class for the flot.
 */
class flotStyleBar extends flotStyle {
  function __construct() {
    parent::__construct();
    $this->bars->show = TRUE;
    $this->bars->lineWidth = 0;
    $this->bars->fill = .5;
  }
}

/**
 * Points style class for the flot.
 */
class flotStylePoint extends flotStyle {
  function __construct() {
    parent::__construct();
    $this->points->show = TRUE;
    $this->points->lineWidth = 1;
    $this->points->fill = .1;
  }
}