<?php
/*********************************************************************************************
 * 
 * CONSTANTS
 * 
 ********************************************************************************************/
define('SCRATCHPADS_DEFAULT_COLOUR', '047DB8');

/*********************************************************************************************
 * 
 * CORE HOOKS
 * 
 ********************************************************************************************/
/**
 * Implements hook_block_info().
 */
function scratchpads_colour_block_info(){
  // This example comes from node.module.
  $blocks['colour_switcher'] = array(
    'info' => t('Colour switcher'),
    'region' => 'slide_bottom',
    'theme' => 'scratchpads',
    'status' => 1
  );
  return $blocks;
}

/**
 * Implements hook_block_view().
 */
function scratchpads_colour_block_view($delta = ''){
  $path = drupal_get_path('module', 'scratchpads_colour');
  $block = array();
  switch($delta){
    case 'colour_switcher':
      if(user_access('scratchpads colour')){
        $path = drupal_get_path('module', 'scratchpads_colour');
        $image = theme('image', array(
          'path' => $path . '/images/colour-picker.png',
          'alt' => 'Colours',
          'title' => 'Colours'
        ));
        $block['content'] = array(
          '#prefix' => '<div class="scratchpads-slide-toggle-container">',
          '#suffix' => '</div>',
          'link' => array(
            '#markup' => l($image, '/', array(
              'attributes' => array(
                'class' => array(
                  'scratchpads-slide-toggle'
                )
              ),
              'html' => true
            ))
          ),
          'body' => array(
            '#prefix' => '<div class="scratchpads-slide-toggle-body">',
            '#suffix' => '</div>',
            'form' => drupal_get_form('scratchpads_colour_form')
          ),
          '#attached' => array(
            'css' => array(
              $path . '/css/scratchpads_colour.css'
            ),
            'js' => array(
              $path . '/js/scratchpads_colour.js'
            )
          )
        );
      }
      break;
  }
  return $block;
}

/**
 * Implements hook_theme().
 */
function scratchpads_colour_theme($existing, $type, $theme, $path){
  return array(
    'scratchpads_colour_block' => array(
      'variables' => array(
        'colour' => null
      )
    )
  );
}

/**
 * Implementation of hook_permission().
 */
function scratchpads_colour_permission(){
  return array(
    'scratchpads colour' => array(
      'title' => t('Change colour scheme'),
      'description' => t('Allows user to change the colour scheme of their scratchpads site.')
    )
  );
}

/**
 * Implements hook_scratchpads_default_permissions().
 */
function scratchpads_colour_scratchpads_default_permissions(){
  return array(
    'maintainer' => array(
      'scratchpads colour'
    )
  );
}

/**
 * Callback to get the CSS.
 */
function scratchpads_colour_add_dynamic_css(){
  $css_file = variable_get('scratchpads_colour_css_file', FALSE);
  if($css_file && file_exists($css_file)){return drupal_add_css($css_file);}
  $css = array();
  foreach(scratchpads_colour_get_colours() as $colour){
    $css[] = 'body.scratchpad-colour-' . $colour . ' .section-header{ background-color: #' . $colour . ';}';
    $css[] = 'body.scratchpad-colour-' . $colour . ' #region-content h2{ background-color: #' . $colour . ';}';
    $css[] = 'body.scratchpad-colour-' . $colour . ' #region-content h2 a{ color: #FFFFFF;}'; // required or link in h2 gets hidden by background color
    $css[] = 'body.scratchpad-colour-' . $colour . ' a{ color: #' . $colour . ';}';
    $css[] = 'body.scratchpad-colour-' . $colour . ' h1{ color: #' . $colour . ';}';
    $css[] = 'body.scratchpad-colour-' . $colour . ' #region-sidebar ul.menu ul li{ color: #' . $colour . ';}';
    $css[] = 'body.scratchpad-colour-' . $colour . ' .sp-bg-colour{ background-color: #' . $colour . ';}';
    $css[] = 'body.scratchpad-colour-' . $colour . ' .sp-colour{ background-color: #' . $colour . ';}';
  }
  $css = implode(PHP_EOL, $css);
  $filename = 'css_' . drupal_hash_base64($css) . '.css';
  $csspath = 'public://css';
  $uri = $csspath . '/' . $filename;
  file_prepare_directory($csspath, FILE_CREATE_DIRECTORY);
  if(!file_exists($uri) && !file_unmanaged_save_data($css, $uri, FILE_EXISTS_REPLACE)){return FALSE;}
  variable_set('scratchpads_colour_css_file', $uri);
  return drupal_add_css($uri);
}

/*********************************************************************************************
 * 
 * THEME SETTINGS
 * 
 ********************************************************************************************/
/**
 * Implements hook_form_system_theme_settings_alter()
 */
function scratchpads_colour_form_system_theme_settings_alter(&$form, &$form_state){
  $path = drupal_get_path('module', 'scratchpads_colour');
  $form['#attached'] = array(
    'css' => array(
      $path . '/css/scratchpads_colour.css'
    )
  );
  $form['alpha_settings']['colour'] = array(
    '#type' => 'fieldset',
    '#title' => t("Colour")
  );
  $colours = scratchpads_colour_default_colours();
  $colours['custom'] = t("Custom");
  $form['alpha_settings']['colour']['colour'] = array(
    '#type' => 'radios',
    '#options' => $colours,
    '#default_value' => variable_get('scratchpads_colour', SCRATCHPADS_DEFAULT_COLOUR),
    '#title' => t('Colour'),
    '#pre_render' => array(
      'scratchpads_colour_radios_pre_render'
    )
  );
  $form['alpha_settings']['colour']['custom_colour'] = array(
    '#type' => 'textfield',
    '#title' => t('Custom colour'),
    '#default_value' => variable_get('scratchpads_custom_colour'),
    '#size' => 6,
    '#maxlength' => 6,
    '#field_prefix' => '#',
    '#states' => array(
      // Hide the settings when the cancel notify checkbox is disabled.
      'visible' => array(
        'input[name="colour"]' => array(
          'value' => 'custom'
        )
      )
    ),
    '#element_validate' => array(
      'scratchpads_colour_validate_custom_colour'
    )
  );
  $form['#submit'][] = 'scratchpads_colour_form_system_theme_settings_submit';
}

function scratchpads_colour_validate_custom_colour($element, &$form_state, $form){
  if($form_state['values']['colour'] == 'custom' && empty($element['#value'])){
    form_error($element, t('This field is required if custom colour is selected.'));
  }
  // If custom colour is not empty, validate the hex value
  if(!empty($element['#value']) && !preg_match('/[a-f0-9]{6}$/i', $element['#value'])){
    form_error($element, t('This is not a valid hexadecimal colour value.'));
  }
}

function scratchpads_colour_form_system_theme_settings_submit($form, $form_state){
  variable_set('scratchpads_colour', $form_state['values']['colour']);
  variable_set('scratchpads_custom_colour', $form_state['values']['custom_colour']);
  variable_del('scratchpads_colour_css_file');
}

/*********************************************************************************************
 * 
 * COLOUR CHANGE FORM
 * 
 ********************************************************************************************/
/**
 * Colour form
 */
function scratchpads_colour_form($form, $form_state){
  $colours = scratchpads_colour_get_colours();
  $form['colour'] = array(
    '#type' => 'radios',
    '#options' => $colours,
    '#default_value' => variable_get('scratchpads_colour', SCRATCHPADS_DEFAULT_COLOUR),
    '#pre_render' => array(
      'scratchpads_colour_radios_pre_render'
    ),
    '#weight' => 3 // Reverse weight for floating
  );
  $form['save'] = array(
    '#type' => 'submit',
    '#value' => t('Save'),
    '#weight' => 2
  );
  $form['#attributes']['class'] = 'clearfix';
  return $form;
}

/**
 * Colour form submit
 * Change the colour variable
 */
function scratchpads_colour_form_submit($form, $form_state){
  variable_set('scratchpads_colour', $form_state['values']['colour']);
}

/**
 * Form prerender radios
 */
function scratchpads_colour_radios_pre_render(&$element){
  foreach(element_children($element) as $colour){
    if($colour != 'custom'){
      $element[$colour]['#suffix'] = theme('scratchpads_colour_block', array(
        'colour' => $colour
      ));
    }
  }
  return $element;
}

/*********************************************************************************************
 * 
 * THEME & PREPROCESS FUNCTIONS
 * 
 ********************************************************************************************/
function theme_scratchpads_colour_block($variables){
  return '<span id="' . $variables['colour'] . '" href="#" style="background-color:#' . $variables['colour'] . '" class="scratchpad-color-option"></span>';
}

function scratchpads_colour_preprocess_html(&$vars){
  if(path_is_admin($_GET['q'])){return;}
  scratchpads_colour_add_dynamic_css();
  $colour = variable_get('scratchpads_colour', SCRATCHPADS_DEFAULT_COLOUR);
  if($colour == 'custom'){
    $colour = variable_get('scratchpads_custom_colour');
  }
  $vars['classes_array'][] = 'scratchpad-colour-' . $colour;
}

/*********************************************************************************************
 * 
 * MODULE FUNCTIONS
 * 
 ********************************************************************************************/
function scratchpads_colour_default_colours(){
  $default_colours = array(
    '353535',
    '1F3661',
    '154D8C',
    '047DB8',
    '2FA7C3',
    '134823',
    '5F8B3D',
    '67A53D',
    'A5C033',
    '7C1227',
    'B72932',
    'E47C25',
    'E9B61E',
    '57508E'
  );
  // Use values for keys
  return array_combine($default_colours, $default_colours);
}

function scratchpads_colour_get_colours(){
  $colours = scratchpads_colour_default_colours();
  if($custom_colour = variable_get('scratchpads_custom_colour')){
    $colours[$custom_colour] = $custom_colour;
  }
  return $colours;
}