<?php

//$Id: userpoints.module,v 1.44.2.5 2007-04-07 03:59:53 kbahey Exp $

// Copyright 2005-2007 Khalid Baheyeldin http://2bits.com

define('USERPOINTS_PERM_VIEW',           'view userpoints');
define('USERPOINTS_PERM_USE',            'use userpoints');
define('USERPOINTS_PERM_ADMIN',          'admin userpoints');

define('USERPOINTS_TRANS_UCPOINTS',      'userpoints_trans_ucpoints');
define('USERPOINTS_TRANS_LCPOINTS',      'userpoints_trans_lcpoints');
define('USERPOINTS_TRANS_LCPOINT',       'userpoints_trans_lcpoint');

define('USERPOINTS_STATUS',              'userpoints_status');

define('USERPOINTS_POINTS_MODERATION',    'userpoints_points_moderation');

define('USERPOINTS_TXN_STATUS_APPROVED',  0);
define('USERPOINTS_TXN_STATUS_PENDING',   1);
define('USERPOINTS_TXN_STATUS_DECLINED',  2);

define('USERPOINTS_PAGE_COUNT',           30);

/**
 * returns an array of common translation placeholders
 */
function userpoints_translation() {
  static $trans;
  
  if (!isset($trans)) {
    $trans = array(
      '!Points' => variable_get(USERPOINTS_TRANS_UCPOINTS, 'Points'),
      '!points' => variable_get(USERPOINTS_TRANS_LCPOINTS, 'points'),
      '!point'  => variable_get(USERPOINTS_TRANS_LCPOINT, 'point')
      );
  }
  return $trans;  
}

function userpoints_txn_status() {
  return array(
      USERPOINTS_TXN_STATUS_APPROVED => t('Approved'),
      USERPOINTS_TXN_STATUS_PENDING  => t('Pending'),
      USERPOINTS_TXN_STATUS_DECLINED => t('Declined'),
      );
}

/**
 * Implementation of hook_help().
 */
function userpoints_help($section) {
  switch ($section) {
    case 'admin/settings/userpoints':
      $output = t('Configure userpoints moderation and branding translation', userpoints_translation());
      break;
    case 'admin/help#userpoints':
      $output = t('Users earn !points as they post nodes, comments, and vote on nodes', userpoints_translation());
  }
  return $output;
}

/**
 * Implementation of hook_menu().
 */
function userpoints_menu($may_cache) {
  $items = array();

  if ($may_cache) {
    $items[] = array(
      'path'     => 'userpoints',
      'callback' => 'userpoints_list_users',
      'title'    => t('users by !points', userpoints_translation()),
      'description' => t('List users by !points', userpoints_translation()),
      'access'   => user_access(USERPOINTS_PERM_VIEW),
      'type'     => MENU_NORMAL_ITEM,
    );
  
    $items[] = array(
      'path'     => 'admin/settings/userpoints',
      'callback' => 'drupal_get_form',
      'callback arguments' => array('userpoints_admin_settings'),
      'title'    => t('!Points settings', userpoints_translation()),
      'description' => t('Configure userpoints settings'),
      'access'   => user_access(USERPOINTS_PERM_ADMIN),
      'type'     => MENU_NORMAL_ITEM,
    );

    $items[] = array(
      'path'     => 'admin/user/userpoints',
      'callback' => 'userpoints_admin_manage',
      'title'    => t('!Points', userpoints_translation()),
      'description' => t('Manage !points', userpoints_translation()),
      'access'   => user_access(USERPOINTS_PERM_ADMIN),
    );
    $items[] = array(
      'path'     => 'admin/user/userpoints/manage',
      'callback' => 'userpoints_admin_manage',
      'title'    => t('Manage'),
      'access'   => user_access(USERPOINTS_PERM_ADMIN),
      'type'     => MENU_DEFAULT_LOCAL_TASK,
      'weight'   => -1,
    );
    $items[] = array(
      'path'     => 'admin/user/userpoints/add',
      'callback' => 'drupal_get_form',
      'callback arguments' => array('userpoints_admin_txn'),
      'title'    => t('Add'),
      'description' => t('Admin add/delete userpoints'),
      'access'   => user_access(USERPOINTS_PERM_ADMIN),
      'type'     => MENU_LOCAL_TASK,
      );
    
    $items[] = array(
      'path'     => 'admin/user/userpoints/edit',
      'callback' => 'drupal_get_form',
      'callback arguments' => array('userpoints_admin_txn'),
      'access'   => user_access(USERPOINTS_PERM_ADMIN),
      'type'     => MENU_CALLBACK,
      );
  
    $items[] = array(
      'path'     => 'admin/user/userpoints/approve',
      'callback' => 'userpoints_admin_approve',
      'access'   => user_access(USERPOINTS_PERM_ADMIN),
      'type'     => MENU_CALLBACK,
    );
  
    $items[] = array(
      'path'     => 'admin/user/userpoints/decline',
      'callback' => 'userpoints_admin_approve',
      'access'   => user_access(USERPOINTS_PERM_ADMIN),
      'type'     => MENU_CALLBACK,
    );
  
  }
  
  return $items;
}

/**
 * Implementation of hook_perm().
 */
function userpoints_perm() {
  return array (USERPOINTS_PERM_VIEW, USERPOINTS_PERM_USE, USERPOINTS_PERM_ADMIN);
}

/**
 * menu callback for settings form.
 */
function userpoints_admin_settings() {
  $form['status'] = array(
    '#type' => 'fieldset',
    '#title' => t('Moderation'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
    '#weight' => -1,
  );

  $form['status'][USERPOINTS_POINTS_MODERATION] = array(
    '#type'          => 'radios',
    '#title'         => t('Transaction status'),
    '#default_value' => variable_get(USERPOINTS_POINTS_MODERATION, 0),
    '#options'       => array(t('Approved'), t('Moderated')),
    '#description'   => t('Select whether all !points should be approved automatically, or moderated, and require admin approval', userpoints_translation()),
  );

  $group = 'renaming';
  $form[$group] = array(
    '#type' => 'fieldset',
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
    '#title' => t('Points branding'),
  );
  
  $form[$group][USERPOINTS_TRANS_UCPOINTS] = array(
  '#type' => 'textfield',
  '#title' => t('Word to use in the interface for the upper case plural word !Points', userpoints_translation()),
  '#default_value' => variable_get(USERPOINTS_TRANS_UCPOINTS, 'Points'),
  '#size' => 20,
  '#maxlength' => 20,
  );
  
  $form[$group][USERPOINTS_TRANS_LCPOINTS] = array(
  '#type' => 'textfield',
  '#title' => t('Word to use in the interface for the lower case plural word !points', userpoints_translation()),
  '#default_value' => variable_get(USERPOINTS_TRANS_LCPOINTS, 'points'),
  '#size' => 20,
  '#maxlength' => 20,
  );
  
  $form[$group][USERPOINTS_TRANS_LCPOINT] = array(
  '#type' => 'textfield',
  '#title' => t('Word to use in the interface for the lower case singular word !point', userpoints_translation()),
  '#default_value' => variable_get(USERPOINTS_TRANS_LCPOINT, 'point'),
  '#size' => 20,
  '#maxlength' => 20,
  );
  
  $form['setting'] = module_invoke_all('userpoints', 'setting');

  return system_settings_form($form);
}  

/**
 * @param uid: user id of the user to get or lose the points
 *
 * @return number of current points in that user's account
 */
function userpoints_get_current_points($uid) {
  return (int)db_result(db_query('SELECT points FROM {userpoints} WHERE uid = %d', $uid));
}

/**
 * @param op: operation to be performed.
 *    'points' 
 *      modules should use this to award points
 *    'points before' 
 *      hook that fires before points are added
 *    'points after' 
 *      hook that fires after points have been added
 * @param points: number of points to add (if positive) or subtract (if negative)
 * @param uid: user id of the user to get or lose the points
 * @param event: optional event ID
 * @param event: optional description 
 *
 * @return FALSE when no action is take, TRUE when points are credited or debited
 */
function userpoints_userpointsapi($op, $points = 0, $uid = 0, $event = NULL, $description = NULL) {
  // anonymous users do not get points, and there have to be points to process
  if ($uid == 0 || $points == 0) {
    return FALSE;
  }

  switch($op) {
    // When called explicitly, we handle only two cases. The rest are hooks
    // that should be defined in other modules.
    case 'points':
    case 'txn approve':
      break;
    default:
      // Invalid hook
      return FALSE;
  }

  $user = user_load(array('uid'=>$uid));
  
  $rc = module_invoke_all('userpoints', 'points before', $points, $uid, $event);
  foreach($rc as $key => $value) {
    if ($value == FALSE) {
      // Do not process the points
      return FALSE;
    }
  }
  
  if ($points < 0) {
    $msg = t('lost');
  }
  else {
    $msg = t('earned');
  }

  if ($op != 'txn approve') {
    $moderation = userpoints_transaction($points, $uid, $event, $description);
    if ($moderation) {
      // Points are moderated, so we do nothing for now.  
      drupal_set_message(t('User %uname %op %pointsvalue !points, pending administrator approval.',
        array_merge(userpoints_translation(), array(
          '%uname'  => $user->name,
          '%op'     => $msg,
          '%pointsvalue' => abs($points),
          '%total'  => $current_points)
           )));

      return TRUE;
    }
  }

  $current_points = (int)$points + (int)userpoints_get_current_points($uid);

  // Check if user has earned points
  if ($points > 0) {
    // Set the max_points to be the current max points, plus whatever earned in this transaction
    $max_points = db_result(db_query('SELECT max_points FROM {userpoints} WHERE uid = %d', $uid));
    $max_points = $current_points + (int)$max_points;
  }

  drupal_set_message(t('User %uname %op %pointsvalue !points! Total now is %total points.',
    array_merge(userpoints_translation(), array(
      '%uname'  => $user->name,
      '%op'     => $msg,
      '%pointsvalue' => abs($points),
      '%total'  => $current_points)
      )));

  if (_userpoints_user_exists($uid)) {
    db_query("UPDATE {userpoints}
      SET points = %d, max_points = %d, last_update = %d WHERE uid = %d",
      $current_points,
      $max_points,
      time(),
      $uid);
  }
  else {
    $result = db_query("INSERT INTO {userpoints}
      VALUES (%d, %d, %d, %d)",
      $uid,
      $current_points,
      $max_points,
      time());
  }
  module_invoke_all('userpoints', 'points after', $points, $uid, $event);

  return TRUE;
}

function userpoints_transaction($points = 0, $uid = 0, $event = NULL, $description = NULL) {
  $moderation = variable_get(USERPOINTS_POINTS_MODERATION, FALSE);
  db_query("INSERT INTO {userpoints_txn}
    VALUES (0, %d, 0, %d, %d, '%s', '%s', %d)",
    $uid,
    $points,
    time(),
    $event,
    $description,
    $moderation);
  return $moderation;
}

function _userpoints_user_exists($uid) {
  return (int)db_result(db_query('SELECT COUNT(*) FROM {userpoints} WHERE uid = %d', $uid));
}

function userpoints_user($op, &$edit, &$user, $category = '') {
  switch($op) {
    case 'delete':
      db_query('DELETE FROM {userpoints} WHERE uid = %d', $user->uid);
      db_query('DELETE FROM {userpoints_txn} WHERE uid = %d', $user->uid);
      break;
    case 'view':
      $points = (int)db_result(db_query('SELECT points FROM {userpoints} WHERE uid = %d', $user->uid));
      $disp_points[] = array(
        'title' => t('User !points', userpoints_translation()),
        'value' => $points,
        );
      return array(t('!Points', userpoints_translation()) => $disp_points);
      break;
  }
}

function userpoints_admin_manage() {
  $header = array(
    array('data' => t('User'), 'field' => 'uid', 'sort' => 'desc'),
    array('data' => t('Time stamp'), 'field' => 'time_stamp'),
    array('data' => t('!Points', userpoints_translation()), 'field' => 'points'),
    array('data' => t('Event'), 'field' => 'event'),
    array('data' => t('Operation', userpoints_translation())),
  );

  $sql = "SELECT t.txn_id, t.uid, t.time_stamp, t.points, t.event, t.status FROM {userpoints_txn} t WHERE t.status = %d";

  $sql .= tablesort_sql($header);
  $result = pager_query($sql, USERPOINTS_PAGE_COUNT, 0, NULL, USERPOINTS_TXN_STATUS_PENDING);
    while ($data = db_fetch_object($result)) {
      $user = user_load(array('uid'=>$data->uid));
      $rows[] = array(
        array('data' => theme('username', $user)),
        array('data' => format_date($data->time_stamp, 'custom', 'Y-m-d H:i')),
        array('data' => $data->points, 'align' => 'right'),
        array('data' => $data->event),
        array('data' => l('approve', "admin/user/userpoints/approve/$data->txn_id") .
                  ' ' . l('decline', "admin/user/userpoints/decline/$data->txn_id") .
                  ' ' . l('edit',    "admin/user/userpoints/edit/$data->txn_id")
             ),
      );
    }

  $output = theme('table', $header, $rows);
  $output .= theme('pager', NULL, 30, 0);

  return $output;
}

function userpoints_admin_approve() {
  global $user;
  $op = arg(3);
  $txn_id = (int)arg(4);
  if ($txn_id) {
    switch($op) {
      case 'approve':
        $result = db_query("SELECT uid, event, points, description
          FROM {userpoints_txn}
          WHERE status = %d AND txn_id = %d",
          USERPOINTS_TXN_STATUS_PENDING, $txn_id);
        $data = db_fetch_object($result);
        drupal_set_message(t('Transaction approved'));
        // This transaction has not been credited to the user's account, so credit it first
        userpoints_userpointsapi('txn approve', $data->points, $data->uid, $data->event, $data->description);
        // Set it to approved
        db_query("UPDATE {userpoints_txn}
          SET status = %d, approver_uid = %d WHERE txn_id = %d",
          USERPOINTS_TXN_STATUS_APPROVED,
          $user->uid,
          $txn_id);
        break;
      case 'decline':
        db_query("UPDATE {userpoints_txn}
          SET status = %d, approver_uid = %d  WHERE txn_id = %d",
          USERPOINTS_TXN_STATUS_DECLINED,
          $user->uid,
          $txn_id);
        drupal_set_message(t('Transaction declined'));
        break;
    }
  }
  drupal_goto('admin/user/userpoints');
}

function userpoints_admin_txn() {
  global $user;

  $mode = arg(3);
  $txn_id = (int)arg(4);

  $timestamp = format_date(time(), 'custom', 'Y-m-d H:i O');

  if ($mode == 'edit' && $txn_id) {
    $result = db_query('SELECT * FROM {userpoints_txn} WHERE txn_id = %d', $txn_id);
    $txn = db_fetch_object($result);
    $timestamp = format_date($txn->time_stamp, 'custom', 'Y-m-d H:i O');
  }

  $form['uid'] = array(
    '#type'          => 'textfield',
    '#title'         => t('User ID'),
    '#size'          => 10,
    '#maxlength'     => 7,
    '#default_value' => $txn->uid,
    '#description'   => t('Drupal User ID for the user you want the points to affect'),
    );
  
  $form['points'] = array(
    '#type'          => 'textfield',
    '#title'         => t('Points'),
    '#size'          => 10,
    '#maxlength'     => 7,
    '#default_value' => $txn->points,
    '#description'   => t('Number of points to add/subtract from the user. For example, 25 (to add points) or -25 (to subtract points).'),
    );
  
  $form['time_stamp'] = array(
    '#type'          => 'textfield',
    '#title'         => t('Date/Time'),
    '#default_value' => $timestamp,
    '#size'          => 30,
    '#maxlength'     => 30,
    '#description'   => t('Date and time of this transaction, in the form YYYY-MM-DD HH:MM +ZZZZ'),
    );  

  $form['description'] = array(
    '#type'          => 'textarea',
    '#title'         => t('Description'),
    '#default_value' => $txn->description,
    '#width'         => 70,
    '#lines'         => 5,
    '#description'   => t('Enter an optional description for this transaction, such as the reason it is created.'),
    );  
      
  switch($mode) {
    case 'add':
      $form['approver_uid'] = array(
        '#type'  => 'hidden',
        '#value' => $user->uid,
        ); 
      
      $form['event'] = array(
        '#type'  => 'hidden',
        '#value' => 'admin',
        );  
      
      $form['status'] = array(
        '#type'  => 'hidden',
        '#value' => USERPOINTS_TXN_STATUS_PENDING,
        );
      
      $form['mode'] = array(
        '#type'  => 'hidden',
        '#value' => $mode,
        );
      break;
      
   case 'edit':
     $form['txn_id'] = array(
       '#type'  => 'hidden',
       '#value' => $txn->txn_id,
       ); 
     
     $form['approver_uid'] = array(
       '#type'  => 'textfield',
       '#description' => t('Approver ID'),
       '#default_value' => $txn->approver_uid,
       '#size'          => 10,
       '#maxlength'     => 7,
       '#description'   => t('The user ID of the person who approved this transaction. 0 means not yet approved.'),
       ); 
    
      $form['event'] = array(
        '#type'  => 'textfield',
        '#description' => t('Event'),
        '#default_value' => $txn->event,
        '#size'          => 20,
        '#maxlength'     => 20,
        '#description'   => t('The event type for this transaction. Normally, it is "admin".'),
        );  
      
      $form['status'] = array(
        '#title' => t('Approval status'),
        '#type' => 'radios', 
        '#options' => userpoints_txn_status(), 
        '#description' => t('Approval status of the transaction.'),
        '#default_value' => $txn->status,
        );
      break;
  }
      
  $form['mode'] = array(
      '#type'  => 'hidden',
      '#default_value' => $mode
      );
    
  $form['submit'] = array(
    '#type' => 'submit',
    '#value' => t('Save'),
    );

  return $form;
}

function userpoints_admin_txn_submit($form_id, $form = NULL) {
  if ($form_id != 'userpoints_admin_txn') {
    return;
  }
  
  switch($form['mode']) {
    case 'add':
      userpoints_userpointsapi('points', $form['points'], $form['uid'], 'admin', $form['description']);
      break;
      
    case 'edit':
      db_query("UPDATE {userpoints_txn} 
        SET uid = %d, approver_uid = %d, points = %d, time_stamp = %d, event = '%s', description = '%s', status = %d WHERE txn_id = %d", 
        $form['uid'],
        $form['approver_uid'],
        $form['points'],
        strtotime($form['time_stamp']),
        $form['event'],
        $form['description'],
        $form['status'],
        $form['txn_id']);
      drupal_set_message(t('Transaction has been updated.'));
  }
  
  drupal_goto('admin/user/userpoints');
}

function userpoints_list_users() {
  $sql = "SELECT p.uid, u.name, p.points
    FROM {userpoints} p INNER JOIN {users} u USING (uid)
    GROUP BY p.uid";
  $sql_cnt = "SELECT COUNT(DISTINCT(uid)) FROM {userpoints}";
  $header = array(
    array('data' => t('User'), 'field' => 'u.name'),
    array('data' => t('!Points', userpoints_translation()), 'field' => 'p.points', 'sort' => 'desc'),
  );
  $sql .= tablesort_sql($header);
  $result = pager_query($sql, 30, 0, $sql_cnt);
  while ($data = db_fetch_object($result)) {
    $rows[] = array(
      array('data' => theme('username', $data)),
      array('data' => $data->points, 'align' => 'right'),
    );
  }

  $output = theme('table', $header, $rows);
  $output .= theme('pager', NULL, 30, 0);

  return $output;
}

function userpoints_block($op = 'list', $delta = 0, $edit = array()) {
  global $user;

  $num = 5;

  switch ($op) {
    case 'list':
      $blocks[0]['info'] = t('User\'s !points', userpoints_translation());
      $blocks[1]['info'] = t('Highest Users');
      return $blocks;

    case 'view':
      if (user_access(USERPOINTS_PERM_VIEW)) {
        switch ($delta) {
          case 0:
            $title = t('@user\'s !points', array_merge(array('@user' => $user->name), userpoints_translation()));;
            if ($user->uid) {
              $points = (int) db_result(db_query('SELECT points FROM {userpoints} WHERE uid = %d', $user->uid));
              $singular = t('!point', userpoints_translation());
              $plural = t('!points', userpoints_translation());
              $content = t('You have %p %c', array('%p' => $points, '%c' => format_plural($points, $singular, $plural)));
            }
            else {
              $content = t('!Points are visible to logged in users only',userpoints_translation());
            }
            break;

          case 1:
            $title = t('Highest Users');
            $result = db_query_range('SELECT p.uid, u.name, p.points
              FROM {userpoints} p INNER JOIN {users} u USING (uid)
              GROUP BY p.uid
              ORDER BY p.points DESC', 0, $num);
            while ($data = db_fetch_object($result)) {
              $rows[] =
                array(
                  array('data' => theme('username', $data)),
                  array('data' => $data->points, 'align' => 'right'));
            }
            $header = array(t('User'), t('!Points', userpoints_translation()));
            $content = theme('table', $header, $rows);
            $content .= '<div class="more-link">'. l(t('more'), 'userpoints', array('title' => t('All users by !points', userpoints_translation()))) .'</div>';
            break;
        }

        $block['subject'] = $title;
        $block['content'] = $content;

        return $block;
      }
  }
}