<?php

namespace ORM;

class BelongsToMany {

    private $localObject;
    private $foreignObject;
    private $pivotTable;
    private $localInPivot;
    private $remoteInPivot;
    private $remoteFilter;
    private $remoteLimit;

    function __construct($localObject, $foreignObject, $pivotTable, $localInPivot, $remoteInPivot, $remoteFilter = Array(), $remoteLimit = Array()) {
        $this->localObject = $localObject;
        $this->foreignObject = $foreignObject;
        $this->pivotTable = $pivotTable;
        $this->localInPivot = $localInPivot;
        $this->remoteInPivot = $remoteInPivot;
        $this->remoteFilter = $remoteFilter;
        $this->remoteLimit = $remoteLimit;
    }

    function get() {
        
        $limitsSql = '';
        foreach ($this->remoteLimit as $key => $value) {
            $limitsSql .= "$key $value ";
        }

        $pivotTable = '{' . $this->pivotTable . '}';        
        $sql = "SELECT $this->remoteInPivot FROM $pivotTable WHERE $this->localInPivot = ? $limitsSql";
        
        $relations = DBInstance::query($sql, Array($this->localObject->id), $this->localObject::_connectionName);
                
        $ids = Array();        
        foreach ($relations as $relation) {
            $ids[] = $relation->{$this->remoteInPivot};
        }
        
        if (empty($ids)) {
            return Array();
        }
        
        return $this->foreignObject::findMany(array_merge(Array('id' => Array('IN', $ids)), $this->remoteFilter), Array('*'), $this->remoteLimit);        
    }

}