<?php
// Drupal Voting Service
// Written by Travis Tidwell @ www.travistidwell.com

/**
 * Implementation of hook_help().
 */
function voting_service_help($section = 'admin/help#services_voting') {
  switch ($section) {
    case 'admin/settings/modules#description':
      return t('Provides voting methods to services applications. Requires services.module.');
  }
}

/**
 * Implementation of hook_service()
 */
function voting_service_service() {
  return array(
    
    // vote.get
    array(
      '#method'   => 'vote.getVote',
      '#callback' => 'voting_service_get_vote',
      '#key'      => FALSE,
      '#args'     => array(
        array(
          '#name'         => 'content_type',
          '#type'         => 'string',
          '#description'  => t('The type of content which you are voting for.')),
        array(
          '#name'         => 'content_id',
          '#type'         => 'int',
          '#description'  => t('The ID of the content which you are voting for.')),
        array(
          '#name'         => 'tag',
          '#type'         => 'string',
          '#description'  => t('The category of the vote within the content type.'),
          '#optional'     => TRUE)      
      ),
      '#return'   => 'array',
      '#help'     => t('Returns a vote.')),
      
    array(
      '#method'   => 'vote.getUserVote',
      '#callback' => 'voting_service_get_user_vote',
      '#key'      => FALSE,
      '#args'     => array(
        array(
          '#name'         => 'content_type',
          '#type'         => 'string',
          '#description'  => t('The type of content which you are voting for.')),
        array(
          '#name'         => 'content_id',
          '#type'         => 'int',
          '#description'  => t('The ID of the content which you are voting for.')),
        array(
          '#name'         => 'tag',
          '#type'         => 'string',
          '#description'  => t('The category of the vote within the content type.'),
          '#optional'     => TRUE)       
      ),
      '#return'   => 'array',
      '#help'     => t('Returns a vote.')),      
      
    // vote.set
    array(
      '#method'   => 'vote.setVote',
      '#callback' => 'voting_service_set_vote',
      '#args'     => array(
        array(
          '#name'         => 'content_type',
          '#type'         => 'string',
          '#description'  => t('The type of content which you are voting for.')),
        array(
          '#name'         => 'content_id',
          '#type'         => 'int',
          '#description'  => t('The ID of the content which you are voting for.')),
        array(
          '#name'         => 'vote_value',
          '#type'         => 'int',
          '#description'  => t('The value of the vote.')),
        array(
          '#name'         => 'tag',
          '#type'         => 'string',
          '#description'  => t('The category of the vote within the content type.'),
          '#optional'     => TRUE)                        
      ),
      '#return'   => 'array',         
      '#help'     => t('Submit a new vote.')),
    
    // vote.delete
    array(
      '#method'   => 'vote.deleteVote',
      '#callback' => 'voting_service_delete_vote',
      '#args'     => array(
        array(
          '#name'         => 'content_type',
          '#type'         => 'string',
          '#description'  => t('The type of content which you are deleting.')),
        array(
          '#name'         => 'content_id',
          '#type'         => 'int',
          '#description'  => t('The ID of the content which you are deleting.')),
        array(
          '#name'         => 'tag',
          '#type'         => 'string',
          '#description'  => t('The category of the vote within the content type.'),
          '#optional'     => TRUE)
      ),
      '#return'   => 'array',      
      '#help'     => t('Delete a vote.')),
  );
}

function voting_service_get_user_vote($content_type, $content_id, $tag = "vote") {
   global $user;
   
   if( $user->uid )
   {
      $vote = votingapi_get_vote($content_type, $content_id, 'percent', $tag, $user->uid);   
   }
   
   if($vote) {
      return $vote;   
   }
   else
   {
      return array('type'=> $content_type, 'tag' => $tag, 'value' => 0);
   }
   
}

/**
 * Returns a specified node.
 */
function voting_service_get_vote($content_type, $content_id, $tag = "vote") {
   $vote = votingapi_get_voting_result($content_type, $content_id, 'percent', $tag, 'average');
   
   if($vote) {
      return $vote;   
   }
   else
   {
      return array('type'=> $content_type, 'tag' => $tag, 'value' => 0);
   }
   
}

function voting_service_set_vote($content_type, $content_id, $vote_value, $tag = "vote") {
  global $user;

  // Prep variables for anonymous vs. registered voting
  if ($user->uid) {
    $uid = $user->uid;
  }
  else {
    $hostname = $_SERVER['REMOTE_ADDR'];
    if (isset($_SERVER['HTTP_X_FORWARDED_FOR'])) {
      $hostname .= '-'. $_SERVER['HTTP_X_FORWARDED_FOR'];
    }
  }
  $anon_interval = 86400;

  // sanity-check the incoming values.
    if ($vote_value > 100) {
      $vote_value = 100;
    }

    // If the vote value is 0, blindly nuke any votes for this content by the user.
    if ($vote_value == 0) {
      if ($uid) {
        // If the user is logged in, we'll delete votes from that uid.
        $sql = "DELETE FROM {votingapi_vote} WHERE content_type='%s' AND content_id=%d AND value_type='percent' AND uid=%d AND tag='%s'";
        db_query($sql, $content_type, $content_id, $uid, $tag);
        return;
      }
      else {
        // Otherwise, we'll delete votes from the same IP address within the anonymous interval.
        $sql = "DELETE FROM {votingapi_vote} WHERE content_type='%s' AND content_id=%d AND value_type='percent' AND uid=%d AND tag='%s' AND hostname='%s'";
        $sql .= $anon_interval != -1 ? " AND timestamp > %d" : '';
        db_query($sql, $content_type, $content_id, $uid, $tag, $hostname, time() - $anon_interval);
        return;
      }
    }
    // If the vote ISN'T zero, check for existing votes in the database.
    else {
      if ($uid) {
        // If the user is logged in, we'll look for votes from that uid.
        $sql = "SELECT vote_id FROM {votingapi_vote} WHERE content_type='%s' AND content_id=%d AND value_type='percent' AND uid=%d AND tag = '%s'";
        $result = db_query($sql, $content_type, $content_id, $uid, $tag);
      }
      else {
        // Otherwise, we'll look for votes from the same IP address within the anonymous interval.
        $sql = "SELECT vote_id FROM {votingapi_vote} WHERE content_type='%s' AND content_id=%d AND value_type='percent' AND uid=%d AND tag = '%s' AND hostname='%s'";
        $sql .= $anon_interval != -1 ? " AND timestamp > %d" : '';
        $result = db_query($sql, $content_type, $content_id, $uid, $tag, $hostname, time() - $anon_interval);
      }
    }

    // If the old vote exists, either delete it (if the new one is zero)
    // or change it. If it doesn't exist and the vote is non-zero, cast
    // it and recalculate.
    if ($old_vote = db_fetch_object($result)) { 
      votingapi_change_vote($old_vote, $vote_value);
    }
    elseif ($vote_value != 0) {
      votingapi_add_vote($content_type, $content_id, $vote_value, 'percent', $tag, $uid);
    }
  
    votingapi_recalculate_results($content_type, $content_id, TRUE);
    return votingapi_get_voting_result($content_type, $content_id, 'percent', $tag, 'average');
}

function voting_service_delete_vote($content_type, $content_id, $tag = "vote") {
   global $user;
   $vote = votingapi_get_vote($content_type, $content_id, 'percent', $tag, $user->uid);
   
   if($vote) {
      votingapi_delete_vote($vote);
      votingapi_recalculate_results($content_type, $content_id, TRUE);
   }
   
   return votingapi_get_voting_result($content_type, $content_id, 'percent', $tag, 'average');
}