<?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, 0)) AS debits',
		       'SUM(IF(LedgerEntry.credit_ledger_id = Ledger.id, LedgerEntry.amount, 0)) 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)) * LedgerEntry.amount) 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.name' => 'ASC'));

  var $uses = array('Ledger', 'LedgerEntry');

  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'));
    }

/*     $this->Ledger->bindModel(array('hasMany' => array */
/* 				    ('LedgerEntry' => array */
/* 				     ('className' => 'LedgerEntry', */
/* 				      'foreignKey' => false, */
/* 				      'finderQuery' => 'SELECT `LedgerEntry`.* */
/*                                                          FROM pmgr_entries AS `LedgerEntry` */
/*                                                            LEFT JOIN pmgr_transactions AS `Transaction` */
/*                                                              ON `Transaction`.id = `LedgerEntry`.transaction_id */
/* 					                 WHERE LedgerEntry.debit_ledger_id = ({$__cakeID__$}) */
/* 					                    OR LedgerEntry.credit_ledger_id = ({$__cakeID__$}) */
/* 					                 ORDER BY Transaction.stamp', */
/* 				      )))); */

/*     $this->Ledger->Behaviors->attach('Containable'); */
/*     $this->Ledger->Contain(array('LedgerEntry' => array */
/* 				  ( */
/* 				   // Models */
/* 				   'Transaction' => array */
/* 				   ( */
/* 				    // Models */
/* 				    'Customer', */
/* 				    )), */
				  
/* 				  )); */
/*     } */
/*     $ledger = $this->Ledger->read(null, $id); */

    $this->Ledger->Behaviors->attach('Containable');
    $this->Ledger->Contain(array('Account'));
    $ledger = $this->Ledger->read(null, $id);
    //pr($ledger);

    if (in_array($ledger['Account']['type'], array('ASSET', 'EXPENSE')))
      $ledger_type = 'debit';
    else
      $ledger_type = 'credit';

    $ledger['LedgerEntry'] = $this->LedgerEntry->find
      ('all',
       array('link' => array
	     (// Models
	      'Transaction' =>
	      array(// Models
		    'Customer',
		    )),
	     'fields' =>
	     array('id', 'name', 'comment',
		   "IF(LedgerEntry.debit_ledger_id = $id, LedgerEntry.amount, NULL) AS debit",
		   "IF(LedgerEntry.credit_ledger_id = $id, LedgerEntry.amount, NULL) AS credit",
		   "(IF(LedgerEntry.{$ledger_type}_ledger_id = $id, 1, -1) * LedgerEntry.amount) AS balance"),
	     'conditions' => array('OR' =>
				   array("LedgerEntry.debit_ledger_id  = $id",
					 "LedgerEntry.credit_ledger_id = $id")),
	     'order' => array('Transaction.stamp'),
	     //'limit' => 15,
	     //'limit' => 2,
	     ));
    //pr($ledger);

    $balance = 0;
    foreach($ledger['LedgerEntry'] AS &$entry) {
      if (isset($entry[0]))
	$entry = array_merge($entry[0], array_diff_key($entry, array(0)));
      
      $balance += $entry['balance'];
    }

    $title = 'Ledger: ' . $ledger['Ledger']['name'];
    $this->set(compact('ledger', 'title', 'balance'));
  }
}