<?php

class AccountsController extends AppController {

  var $uses = array('Account', 'LedgerEntry');

  var $sidemenu_links =
    array(array('name' => 'Accounts',        'header' => true),
	  array('name' => 'All',             'url' => array('controller' => 'accounts', 'action' => 'all')),
	  array('name' => 'Asset',           'url' => array('controller' => 'accounts', 'action' => 'asset')),
	  array('name' => 'Liability',       'url' => array('controller' => 'accounts', 'action' => 'liability')),
	  array('name' => 'Equity',          'url' => array('controller' => 'accounts', 'action' => 'equity')),
	  array('name' => 'Income',          'url' => array('controller' => 'accounts', 'action' => 'income')),
	  array('name' => 'Expense',         'url' => array('controller' => 'accounts', 'action' => 'expense')),
	  );


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * override: sideMenuLinks
   *  - Generates controller specific links for the side menu
   */
  function sideMenuLinks() {
    return array_merge(parent::sideMenuLinks(), $this->sidemenu_links);
  }

  
  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * action: index / asset / liability / equity / income / expense / all
   *  - Generate a chart of accounts
   */

  function index()     { $this->all(); }
  function all()       { $this->jqGridView('All Accounts',       'all'); }
  function asset()     { $this->jqGridView('Asset Accounts',     'asset'); }
  function liability() { $this->jqGridView('Liability Accounts', 'liability'); }
  function equity()    { $this->jqGridView('Equity Accounts',    'equity'); }
  function income()    { $this->jqGridView('Income Accounts',    'income'); }
  function expense()   { $this->jqGridView('Expense Accounts',   'expense'); }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * 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 jqGridDataTables(&$params, &$model) {
    return array
      ('link' =>
       array(// Models
	     'CurrentLedger' => array
	     (// Models
	      'LedgerEntry' => array
	      ('conditions' =>
	       array('OR' =>
		     array('LedgerEntry.debit_ledger_id  = CurrentLedger.id',
			   'LedgerEntry.credit_ledger_id = CurrentLedger.id'),
		     ),
	       ),
	      ),
	     ),
       );
  }

  function jqGridDataFields(&$params, &$model) {
    return array
      ('Account.*',
       'SUM(IF(LedgerEntry.debit_ledger_id  = CurrentLedger.id,
               LedgerEntry.amount, NULL)) AS debits',
       'SUM(IF(LedgerEntry.credit_ledger_id = CurrentLedger.id,
               LedgerEntry.amount, NULL)) AS credits',
       "SUM(IF(Account.type IN ('ASSET', 'EXPENSE'),
	       IF(LedgerEntry.debit_ledger_id = CurrentLedger.id, 1, -1),
	       IF(LedgerEntry.credit_ledger_id = CurrentLedger.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 (in_array($params['action'], array('asset', 'liability', 'equity', 'income', 'expense'))) {
      $conditions[] = array('Account.type' => strtoupper($params['action']));
    }

    return $conditions;
  }

  function jqGridRecordLinks(&$params, &$model, &$records, $links) {
    $links['Account'] = array('name');
    return parent::jqGridRecordLinks($params, $model, $records, $links);
  }


  /**************************************************************************
   **************************************************************************
   **************************************************************************
   * action: view
   *  - Displays information about a specific account
   */

  function view($id = null) {
    if (!$id) {
      $this->Session->setFlash(__('Invalid Item.', true));
      $this->redirect(array('action'=>'index'));
    }

    // Get details about the account and its ledgers (no ledger entries yet)
    $account = $this->Account->find
      ('first',
       array('contain' =>
	     array(// Models
		   'CurrentLedger' =>
		   array('fields' => array('id', 'sequence')),

		   'Ledger' =>
		   array('order' => array('Ledger.open_stamp' => 'DESC')),
		   ),
	     'conditions' => array(array('Account.id' => $id)),
	     )
       );

    // Get all ledger entries of the CURRENT ledger
    $entries = $this->Account->findLedgerEntries($id);
    $account['CurrentLedger']['LedgerEntry'] = $entries['Entries'];

    // Summarize each ledger
    foreach($account['Ledger'] AS &$ledger)
      $ledger = array_merge($ledger,
			    $this->Account->Ledger->stats($ledger['id']));

    // Obtain the overall account balance
    $account['Account'] =
      array_merge($account['Account'],
		  array('stats' => $this->Account->stats($id)));
    $balance = $account['Account']['stats']['Ledger']['balance'];

    // Prepare to render
    $title = 'Account: ' . $account['Account']['name'];
    $this->set(compact('account', 'title', 'balance'));
  }
}