<?php

class SqlCriteria
{
    private $select = array();

    private $distinct = '';

    private $where = array();

    private $order = array('sort' => array(), 'order' => array());

    private $limit = '';

    /**
     * @var SqlModel
     */
    private $model;

    /**
     * @param $model SqlModel
     */
    public function __construct($model)
    {
        $this->model = $model;
    }

    /**
     * @return SqlResultProvider
     */
    public function find()
    {
        return $this->model->find($this->select, $this->distinct, $this->where, $this->order, $this->limit);
    }

    /**
     * @param $cond string Condition with "?" placeholder @ex 'field=?'
     * @param $value string|array|DbExpr Value. Array transformed to DbExpr(implode(',' Array)) All elements in the array mast be integer
     * @return SqlCriteria
     * @desc Allow multiple calls
     */
    public function where($cond, $value)
    {
        $this->where[$cond] = $value;
        return $this;
    }

    /**
     * @param $field string Field @ex 'field'
     * @param $order_desc bool Descendant sort direction
     * @return SqlCriteria
     * @desc Allow multiple calls
     */
    public function order($field, $order_desc = false)
    {
        $this->order['sort'][] = $field;
        if ($order_desc) {
            $this->order['order'][$field] = 'desc';
        }
        return $this;
    }

    /**
     * @param $limit int
     * @param $offset int
     * @return SqlCriteria
     */
    public function limit($limit, $offset = 0)
    {
        if ($offset) {
            $this->limit = (int) $offset . ',';
        }
        $this->limit .= (int) $limit;
        return $this;
    }

    /**
     * @param string $field
     * @return SqlCriteria
     */
    public function select($field)
    {
        $this->select[] = $field;
        return $this;
    }

    /**
     * @param $field string
     * @return SqlCriteria
     */
    public function distinct($field)
    {
        $this->distinct = $field;
        return $this;
    }
}