<?php
namespace app\models;

use core\base\Model;

/**
 * 库存模型
 */
class Inventory extends Model
{
    protected $table = 'inventory';

    public function getAll()
    {
        return $this->order(['id DESC'])->fetchAll();
    }

    public function getById($id)
    {
        return $this->where(['id = :id'], [':id' => $id])->fetch();
    }

    public function getLowStock()
    {
        return $this->where(['quantity <= min_stock AND min_stock > 0'])->order(['quantity ASC'])->fetchAll();
    }

    public function getCount()
    {
        $sql = 'SELECT COUNT(*) AS cnt, SUM(quantity) AS total_qty FROM ' . $this->getTable();
        $stmt = $this->pdo->prepare($sql);
        $stmt->execute();
        return $stmt->fetch();
    }

    public function search($keyword)
    {
        return $this->where(
            ['product_name LIKE :kw OR product_model LIKE :kw2 OR category LIKE :kw3'],
            [':kw' => "%{$keyword}%", ':kw2' => "%{$keyword}%", ':kw3' => "%{$keyword}%"]
        )->order(['id DESC'])->fetchAll();
    }
}