<?php

class LedgersController extends AppController {
  var $paginate = array
    ('limit' => 100,
     'link' =>
     array(// Models
	   'Account',
	   'LedgerEntry' =>
	   array('fields' =>
		  array('SUM(IF(LedgerEntry.debit_ledger_id  = Ledger.id,
                                LedgerEntry.amount, NULL)) AS debits',
			'SUM(IF(LedgerEntry.credit_ledger_id = Ledger.id,
                                LedgerEntry.amount, NULL)) AS credits',
			"SUM(IF(Account.type IN ('ASSET', 'EXPENSE'),
		                IF(LedgerEntry.debit_ledger_id  = Ledger.id, 1, -1),
		                IF(LedgerEntry.credit_ledger_id = Ledger.id, 1, -1)
                                ) * IF(LedgerEntry.amount, LedgerEntry.amount, 0)
                            ) AS balance",
			'COUNT(LedgerEntry.id) AS entries'),
		 'conditions' =>
		 array('OR' =>
		       array('LedgerEntry.debit_ledger_id  = Ledger.id',
			     'LedgerEntry.credit_ledger_id = Ledger.id'),
		       ),
		 ),
	   ),

     'group' => 'Ledger.id',
     'order' => array('Ledger.account_id', 'Ledger.sequence'));

  var $sidemenu_links =
    array(array('name' => 'Ledgers',      'header' => true),
	  array('name' => 'Current',      'url' => array('controller' => 'ledgers', 'action' => 'current')),
	  array('name' => 'Closed',       'url' => array('controller' => 'ledgers', 'action' => 'closed')),
	  array('name' => 'All',          'url' => array('controller' => 'ledgers', 'action' => 'all')),
	  );


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * override: sideMenuLinks
   *  - Generates controller specific links for the side menu
   */
  function sideMenuLinks() {
    return array_merge(parent::sideMenuLinks(), $this->sidemenu_links);
  }

  
  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * action: index
   */

  function index() {
    $this->current();
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * action: current
   *  - Lists all current ledgers
   */

  function current() {
    $title = 'Current Ledgers';
    $this->set('title', $title); $this->set('heading', $title);
    $this->set('ledgers', $this->paginate(null, array('NOT' => array('Ledger.closed'))));
    $this->render('index');
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * action: closed
   *  - Lists all closed ledgers
   */

  function closed() {
    $title = 'Closed Ledgers';
    $this->set('title', $title); $this->set('heading', $title);
    $this->set('ledgers', $this->paginate(null, array('Ledger.closed')));
    $this->render('index');
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * action: all
   *  - Lists all ledgers
   */

  function all() {
    $title = 'All Ledgers';
    $this->set('title', $title); $this->set('heading', $title);
    $this->set('ledgers', $this->paginate());
    $this->render('index');
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * action: view
   *  - Displays information about a specific ledger
   */

  function view($id = null) {
    if (!$id) {
      $this->Session->setFlash(__('Invalid Item.', true));
      $this->redirect(array('action'=>'index'));
    }

    // Get details about the ledger itself (no entries yet)
    $this->Ledger->Behaviors->attach('Containable');
    $ledger = $this->Ledger->find
      ('first',
       array('contain' =>
	     array(// Models
		   'Account',
		   ),
	     'conditions' => array(array('Ledger.id' => $id)),
	     )
       );
    $this->Ledger->Behaviors->detach('Containable');

    // Get all ledger entries of this ledger
    $ledger['LedgerEntry'] = $this->Ledger->findLedgerEntries
      ($id, $ledger['Account']['type']);

    // Summarize the entries, and obtain the ledger balance
    $ledger['Ledger'] =
      array_merge($ledger['Ledger'],
		  array('stats' => $this->Ledger->stats($id)));
    $balance = $ledger['Ledger']['stats']['balance'];

    // OK, set our view variables and render!
    $title = 'Ledger: ' . $ledger['Ledger']['name'];
    $this->set(compact('ledger', 'title', 'balance'));
  }
}