<?php
// $Id: tasks.module,v 1.5 2006/04/05 16:48:42 jakeg Exp $

// Implementation of hook_help()
function tasks_help($section) {
  switch ($section) {
    case 'admin/modules#description':
      return t('A module to make task nodes.');
    case 'node/add#tasks':
      return t('This is an task type with a few fields.');
  }
}

// Implementation of hook_info
function tasks_node_info() {
  return array(
    'tasks' => array('name' => t('task'), 'base' => 'tasks'),
  );
}

// Implementation of hook_perm().
function tasks_perm() {
  return array('create task', 'edit own task', 'edit all tasks', 'access tasks main page');
}

// Implementation of hook_access().
function tasks_access($op, $node) {
  global $user;

  if ($op == 'create') {
    return user_access('create task');
  }

  if ($op == 'update' || $op == 'delete') {
    if (user_access('edit all tasks') || (user_access('edit own tasks') && ($user->uid == $node->uid))) {
      return TRUE;
    }
  }
}

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

  if ($may_cache) {
    $items[] = array(
      'path' => 'node/add/tasks', 
      'title' => t('task'),
      'access' => user_access('create task')
    );
    $items[] = array(
      'path' => 'tasks',
      'title' => t('Tasks'),
      'callback' => '_tasks_main',
      'access' => user_access('access tasks main page'),
      'type' => MENU_CALLBACK
    );
  }

  return $items;
}

// hook_user implementations
function tasks_user($op, &$edit, &$user, $category = NULL) {
  if($op == "form") {
    $form['tasklist'] = array(
      '#type' => 'fieldset',
      '#title' => t('Tasklist'),
      '#collapsible' => TRUE,
      '#weight' => 4
    );
    $form['tasklist']['tasks_colour'] = array(
      '#type' => 'textfield',
      '#title' => t('Colour'),
      '#default_value' => $edit['tasks_colour'],
      '#description' => t('This will be the colour this user\'s tasks will appear in. Hexdecimal or recognized colour name (e.g. #eee or just \'blue\')')
    );

    return $form;
  }
}

// Implementation of hook_form().
function tasks_form(&$node) {
  drupal_add_js(drupal_get_path('module', 'tasks').'/tasks.js');
  theme_add_style(drupal_get_path('module', 'tasks').'/tasks.css');

  $bc = drupal_get_breadcrumb();
  $bc[] = l(t('Tasks'), 'tasks');
  drupal_set_breadcrumb($bc);

  $form = array();

  // Get a list of tasklists to choose a parent tasklist
  if (!isset($node->parent) || $node->parent != 0) {
    $result = db_query("SELECT n.*, t.* FROM {node} n INNER JOIN {tasks} t ON n.nid = t.nid WHERE n.type='tasks' AND t.completed = '0000-00-00' ORDER BY IF(t.parent = 0,0,1), n.title ASC");

    while ($tasklist = db_fetch_object($result)) {
      if ($tasklist->parent == 0) {
        $tasklist->title = t('-- MASTER TASKLIST --');
      }
      $tasklists[$tasklist->nid] = $tasklist->title;
      $not_master = 1;
    }
    if (!$not_master) $tasklists[0] = t('NO PARENT - THIS IS THE MASTER TASKLIST');

    if (isset($_GET['edit']['parent'])) {
      $node->parent = $_GET['edit']['parent'];
    }
    $form['parent'] = array(
      '#type' => 'select', 
      '#title' => t('Parent Tasklist'), 
      '#default_value' => $node->parent,
      '#options' => $tasklists,
      '#weight' => -10
    );
  }
  else {
    // parent tasklist
    $form['parent'] = array(
      '#type' => 'value', 
      '#value' => 0
    );
  }

  $form['title'] = array(
    '#type' => 'textfield', 
    '#title' => t('Task Name'), 
    '#required' => TRUE, 
    '#default_value' => $node->title
  );

  $form['body'] = array(
    '#type' => 'textarea', 
    '#title' => t('About this task'), 
    '#default_value' => $node->body, 
    '#rows' => 10
  );

  $form['format'] = filter_form($node->format);

  
  $sql = 'SELECT u.uid, u.name, u.status, u.created, u.access FROM {users} u WHERE uid != 0';
  $result = db_query($sql);
  
  $users[0] = t('-- Unassigned --');
  while ($account = db_fetch_object($result)) {
    $users[$account->uid] = $account->name;
  }

  $form['assigned_to'] = array(
    '#type' => 'select', 
    '#title' => t('Assign to user'), 
    '#default_value' => $node->assigned_to, 
    '#options' => $users
  );

  $form['completed'] = array(
    '#type' => 'checkbox',
    '#title' => t('Completed?'),
    '#default_value' => ($node->completed > 0)?1:0,
    '#attributes' => array("onclick"=>"toggletasks();")
  );

  $form['completed_date'] = array(
    '#type' => 'date',
    '#title' => t('Date Completed'),
    '#prefix' => '<div id="completedate">',
    '#suffix' => '</div>'
  );
  if ($node->completed != '0000-00-00') $form['completed_date']['#default_value'] = $node->completed_date;

  $form['from'] = array(
    '#type' => 'hidden',
    '#value' => arg(3)
  );
  
  if ($node->parent) {
    $result = db_query("SELECT n.*, t.* FROM {node} n, {tasks} t WHERE n.type='tasks' AND t.nid = n.nid AND t.completed = '0000-00-00' AND t.parent = $node->parent ORDER BY t.order_by ASC");

    while ($tasklist = db_fetch_object($result)) {
      if ($tasklist->nid == $node->nid) {
        $tasks[$tasklist->order_by] = t('*************** NO CHANGE ***************');
      }
      else {
        $tasks[$tasklist->order_by] = $tasklist->title;
      }
    }
    $tasks['10000'] = t('*** bottom of list ***');

    $form['order_by'] = array(
      '#type' => 'select', 
      '#title' => t('Place in tasklist above'), 
      '#default_value' => $node->order_by, 
      '#options' => $tasks,
      '#prefix' => '<div id="orderby">',
      '#suffix' => '</div>'
    );
  }
  else {
    $form['order_by'] = array(
      '#type' => 'hidden', 
      '#value' => 1,
      '#prefix' => '<div id="orderby">',
      '#suffix' => '</div>'
    );
  }
  
  
  return $form;
}


// Implementation of hooks_forms_alter so we don't see preview or delete buttons for tasks
function tasks_form_alter($form_id, &$form) {
  global $user;

  if ($form_id == 'tasks_node_form') {
    unset($form['preview']);
    //unset($form['delete']);
  }
}

function tasks_link($type, $node = NULL, $teaser = FALSE) {
  $links = array();

  if ($type == 'node' && $node->type == 'tasks') {
    if (!$teaser) {
      $links[] = l(t('add new sub-task'), "node/add/tasks",
        array('title' => t('Add a new task to this task list')), "edit[parent]=$node->nid");
    }
  }

  return $links;
} 

// Implementation of hook_insert().
function tasks_insert($node) {
  $node->order_by -= 0.1;

  if (!$node->completed) {
    $node->completed_date['year'] = "0000";
    $node->completed_date['month'] = "00";
    $node->completed_date['day'] = "00";
  }

  db_query("INSERT INTO {tasks} (nid, parent, assigned_to, order_by, completed) VALUES (%d, %d, %d, '%s', '%s')", $node->nid, $node->parent, $node->assigned_to, $node->order_by, $node->completed_date['year'].'-'.$node->completed_date['month'].'-'.$node->completed_date['day']);
  _tasks_order_by($node);
}


// Implementation of hook_update().
function tasks_update($node) {
  $node->order_by -= 0.1;

  if (!$node->completed) {
    $node->completed_date['year'] = "0000";
    $node->completed_date['month'] = "00";
    $node->completed_date['day'] = "00";
  }

  db_query("UPDATE {tasks} SET parent = %d, assigned_to = %d, order_by = '%s', completed = '%s' WHERE nid = %d", $node->parent, $node->assigned_to, $node->order_by, $node->completed_date['year'].'-'.$node->completed_date['month'].'-'.$node->completed_date['day'], $node->nid);
  _tasks_order_by($node);

  // Redirect to the tasks home page?
  if ($node->from) drupal_goto('tasks');
}


// Implementation of hook_delete().
function tasks_delete($node) {
  db_query('DELETE FROM {tasks} WHERE nid = %d', $node->nid);
}


// Implementation of hook_load().
function tasks_load($node) {
  $additions = db_fetch_object(db_query('SELECT parent, assigned_to, order_by, completed FROM {tasks} WHERE nid = %d', $node->nid));

  $additions->completed_date['year'] = substr($additions->completed,0,4);
  $additions->completed_date['month'] = substr($additions->completed,5,2);
  $additions->completed_date['day'] = substr($additions->completed,8,2);

  return $additions;
}


/* 
  Implementation of hook_view().

  We want to view the task, and list any sub tasks
*/
function tasks_view(&$node, $teaser = FALSE, $page = FALSE) {
  theme_add_style(drupal_get_path('module', 'tasks').'/tasks.css');
  drupal_add_js(drupal_get_path('module', 'tasks').'/tasks_view.js');

  if ($page) {
    // The page should show the task and any subtasks
    $bc = drupal_get_breadcrumb();
    $bc[] = l(t('Tasks'), 'tasks');
    drupal_set_breadcrumb($bc);

    // Look to see if we need to change node order in this list
    if (($action = $_GET['action']) && ($tid = $_GET['task'])) {
      $task = node_load(array('nid'=>$tid));
      if ($action == 'up') {
        $task->order_by -= 1.3;
        drupal_set_message(t('Task <b>%task</b> has been moved <b>up</b> the tasklist.', array('%task' => $task->title)));
      }
      elseif ($action == 'down') {
        $task->order_by += 1.3;
        drupal_set_message(t('Task <b>%task</b> has been moved <b>down</b> the tasklist.', array('%task' => $task->title)));
      }
      node_save($task);
      drupal_goto("node/$node->nid",null,'task'.$task->nid);
    }

    $node = node_prepare($node, $teaser);

    $output = '';


    // Now show subtasks if there are any
    
    // Filter the tasks shown
    if ($_POST['edit']['filter'] == 0) {
      // incomplete tasks
      $complete = 'AND t.completed = 0';
      $order_by = 't.order_by';
    } 
    elseif ($_POST['edit']['filter'] == 1) {
      // complete tasks
      $complete = 'AND t.completed > 0';
      $order_by = 't.completed DESC';
    } 
    else {
      // all tasks
      $order_by = 'IF(t.completed = 0, 0, 1), t.completed DESC, t.order_by';
    }

    // Get the list of tasks to display
    //$result = db_query("SELECT n.*, t.*, u.name AS assigned_name, u.data FROM {node} n INNER JOIN {tasks} t ON t.nid = n.nid LEFT JOIN {users} u ON u.uid = t.assigned_to WHERE n.status = 1 AND n.type='tasks' AND t.parent = %d %s ORDER BY %s", $node->nid, $complete, $order_by);
    $result = db_query("SELECT n.nid, u.name AS assigned_name, u.data FROM {node} n INNER JOIN {tasks} t ON t.nid = n.nid LEFT JOIN {users} u ON u.uid = t.assigned_to WHERE n.status = 1 AND n.type='tasks' AND t.parent = %d %s ORDER BY %s", $node->nid, $complete, $order_by);

    if ($num_rows = db_num_rows($result)) {

      // Enable the list of tasks to be filtered
      $form['filter'] = array(
        '#type' => 'select',
        '#title' => t('Showing %num_rows tasks. Filter',array('%num_rows'=>$num_rows)),
        '#default_value' => 0,
        '#options' => array(0=>t('Incomplete Tasks'),1=>t('Complete Tasks'),-1=>t('All Tasks'))
      );
      $form['submit'] = array(
        '#type' => 'submit',
        '#value' => t('Filter')
      );
      $form['#action'] = "node/$node->nid";
      $form['#attributes'] = array('id'=>'tasks-filter');
      $output .= drupal_get_form('task_filter',$form);

      while ($task = db_fetch_object($result)) {
        $assigned_name = $task->assigned_name;
        //$tasks_colour = drupal_unpack($task)->tasks_colour;
        $extra = drupal_unpack($task);
        $tasks_colour = $extra->tasks_colour;
        $task = node_load(array('nid'=>$task->nid));
        $rows[] = array(
          'data' => array(
            array('data' => $assigned_name, 'style' => "width:25px;".($tasks_colour ? "background:$tasks_colour;":'')),
            array('data' => l($task->title, "node/$task->nid", array('name'=>'task'.$task->nid)), 'style'=>($task->completed>0)?'text-decoration: line-through;':''),
            array('data' => ($task->completed>0) ? $task->completed : t('No')),
            array('data' => "<a href='javascript: void(true);' onClick=\"javascript:toggleVisibility('row-$task->nid');\">". t('Expand') ."</a> ".l("<img src=\"".drupal_get_path('module', 'tasks')."/icon_edit.gif\" border=\"0\" />", "node/$task->nid/edit/home",array(),null,null,false,true).' '.l(t('Up'),"node/$node->nid",array(),"action=up&task=$task->nid").' '.l(t('Down'),"node/$node->nid",array(),"action=down&task=$task->nid")),
          )
        );
        $task = node_prepare($task);
        $rows[] = array(
          'data' => array(
            array('data' => $task->body, 'colspan' => '4'),
          ),
          'class' => 'task-expand', 'id' => "row-$task->nid", 'style' => 'display:none;'
        );
      }
      $header = array(t('Assigned'),t('Task'), t('Complete?'), t('Edit'));
      $output .= theme('table', $header, $rows, array("id"=>"task-list"));
    }

    $node->body .= $output;
  }
}


// PRIVATE FUNCTIONS


/*
  FUNCTION tasks_main()

  This function redirects to the master tasklist if one exists, or creates one if it doesn't


*/
function _tasks_main() {
 

  // Get the list of tasks to display
  $result = db_query("SELECT t.* FROM {tasks} t WHERE t.parent = 0");

  if ($num_rows = db_num_rows($result)) {
    if ($num_rows != 1) {
      drupal_set_message(t('WARNING: more than one master tasklists. Please delete all but one nodes of type tasks where parent = 0'));
      print theme('page','');
    }
    else {
       while ($node = db_fetch_object($result)) {
         drupal_goto('node/'.$node->nid);
       }
    }
  }
  else {
    // There are no tasks. Create the master task(list)
    drupal_set_message(t('<p>There are no tasks yet, so creating a top-level tasklist.</p>'));
    $node->title = t('Tasklist');
    $node->uid = 1;
    $node->filter = variable_get('filter_default_format', 1);
    $node->status = 1;
    $node->type = 'tasks';
    node_save($node);
    drupal_goto('node/'.$node->nid);
  }	
}


function _tasks_order_by($node) {
  // done either on insert or update of a task. we want to make order by values into integers to get in the updated one and remain consistent

  $result = db_query("SELECT n.*, t.* FROM {node} n, {tasks} t WHERE n.type='tasks' AND t.nid  = n.nid AND t.order_by != 0 AND t.parent = %d ORDER BY t.order_by ASC", $node->parent);

  $i = 1;
  while ($task = db_fetch_object($result)) {
    if ($task->completed != '0000-00-00') $task->order_by = 0;
    else {
      $task->order_by = $i;
      $i++;
    }

    db_query("UPDATE {tasks} SET order_by = %d WHERE nid = %d", $task->order_by, $task->nid);
  }  
}