<?php

class LedgersController extends AppController {

  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 / current / closed / all
   *  - Generate a list of ledgers
   */

  function index()     { $this->all(); }
  function current()   { $this->jqGridView('Current Ledgers'); }
  function closed()    { $this->jqGridView('Closed Ledgers');  }
  function all()       { $this->jqGridView('All Ledgers', 'all'); }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * virtuals: jqGridData
   *  - With the application controller handling the jqGridData action,
   *    these virtual functions ensure that the correct data is passed
   *    to jqGrid.
   */

  function jqGridDataSetup(&$params) {
    parent::jqGridDataSetup($params);
    if (!isset($params['action']))
      $params['action'] = 'all';
  }

  function jqGridDataExtraTables(&$params, &$model, &$query) {
    unset($query['contain']);
    $query['link'] =
      array(// Models
	    'Account',
	    'LedgerEntry' =>
	    array('conditions' =>
		  array('OR' =>
			array('LedgerEntry.debit_ledger_id  = Ledger.id',
			      'LedgerEntry.credit_ledger_id = Ledger.id'),
			),
		  ),
	    );
  }

  function jqGridDataFields(&$params, &$model) {
    return array
      ('Ledger.*',
       'CONCAT(Account.id, "-", Ledger.sequence) AS id_sequence',
       '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');
  }

  function jqGridDataConditions(&$params, &$model) {
    $conditions = parent::jqGridDataConditions($params, $model);

    if ($params['action'] === 'current') {
      $conditions[] = array('NOT' => array('Ledger.closed'));
    }
    elseif ($params['action'] === 'closed') {
      $conditions[] = 'Ledger.closed';
    }

    return $conditions;
  }

  function jqGridDataOrder(&$params, &$model, $index, $direction) {
    $id_sequence = false;
    if ($index === 'id_sequence') {
      $id_sequence = true;
      $index = 'Ledger.account_id';
    }

    $order = parent::jqGridDataOrder($params, $model, $index, $direction);

    if ($id_sequence) {
      $order[] = 'Ledger.sequence ' . $direction;
    }

    return $order;
  }

  function jqGridRecordLinks(&$params, &$model, &$records, $links) {
    $links['Ledger'] = array('id_sequence');
    $links['Account'] = array('name');
    return parent::jqGridRecordLinks($params, $model, $records, $links);
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * 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)
    $ledger = $this->Ledger->find
      ('first',
       array('contain' =>
	     array(// Models
		   'Account',
		   ),
	     'conditions' => array(array('Ledger.id' => $id)),
	     )
       );

    // 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'));
  }
}