<?php

namespace App\Service;

use App\BaseApp\BaseService;
use App\Models\SystemConfigModel;

/**
 * 系统配置 Service：按 key 读写 kv，供 AI 运行时等模块复用
 */
class SystemConfigService extends BaseService
{
    public function __construct()
    {
        // 配置读写不依赖登录态（工厂解析时可能被其他 Service 调用）
        $this->isAuth = false;
        parent::__construct();
        $this->model = SystemConfigModel::class;
    }

    /**
     * 读取配置值；不存在时返回默认值
     * 为什么：业务侧只关心 value，不关心行结构
     */
    public function getValue(string $key, mixed $default = null): mixed
    {
        $key = trim($key);
        if ($key === '') {
            return $default;
        }
        $row = SystemConfigModel::where('key', $key)
            ->where('deleted_at', 0)
            ->first();
        if (!$row) {
            return $default;
        }
        $value = $row->value;
        if ($value === null) {
            return $default;
        }
        return $value;
    }

    /**
     * 写入/更新配置；存在则更新，不存在则插入
     * 为什么用 upsert：配置项数量少，按 key 幂等更稳
     */
    public function setValue(string $key, mixed $value, string $remark = ''): bool
    {
        $key = trim($key);
        if ($key === '') {
            $this->utils->errorThrow('配置键不能为空');
        }
        if (is_array($value) || is_object($value)) {
            $value = json_encode($value, JSON_UNESCAPED_UNICODE);
        }
        $value = (string) $value;
        $now = time();
        $row = SystemConfigModel::where('key', $key)
            ->where('deleted_at', 0)
            ->first();
        if ($row) {
            $row->value = $value;
            if ($remark !== '') {
                $row->remark = $remark;
            }
            $row->updated_at = $now;
            return (bool) $row->save();
        }
        return (bool) SystemConfigModel::insert([
            'key' => $key,
            'value' => $value,
            'remark' => $remark,
            'created_at' => $now,
            'updated_at' => 0,
            'deleted_at' => 0,
        ]);
    }

    /**
     * 批量写入配置
     *
     * @param array<string, mixed> $pairs key => value
     */
    public function setValues(array $pairs): bool
    {
        foreach ($pairs as $key => $value) {
            $this->setValue((string) $key, $value);
        }
        return true;
    }
}