<?php
declare(strict_types=1);
namespace ywxapp\model;

use ywxapp\model\BaseModel;

use think\facade\Db;
use think\model\concern\SoftDelete;

/**
 * 积分规则 & 积分流水
 */
class Score extends BaseModel
{
    use SoftDelete;

    protected $name = 'score_rule';
    protected $deleteTime = 'delete_at';
    protected $defaultSoftDelete = 0;

    protected $autoWriteTimestamp = true;
    protected $createTime = 'create_at';
    protected $updateTime = 'update_at';

    // 规则类型
    const TYPE_GAIN = 1;   // 获取
    const TYPE_SPEND = 2;  // 消费

    public static function typeList(): array
    {
        return [
            self::TYPE_GAIN  => '获取',
            self::TYPE_SPEND => '消费',
        ];
    }

    /**
     * 确保 score_rule / score_log 关联表已就绪（静态入口可能未实例化模型）
     */
    public static function ensureSchema(): void
    {
        $prefix = BaseModel::currentPrefix();
        BaseModel::ensureTableFromInstall($prefix, 'score_rule');
        BaseModel::ensureTableFromInstall($prefix, 'score_log');
        BaseModel::ensureColumn("{$prefix}member", 'score', "int unsigned NOT NULL DEFAULT 0 COMMENT '积分(做任务/互动获得)'");
    }

    /**
     * 积分变动（带流水记录，事务安全）
     * @param int    $uid     用户ID
     * @param int    $type    1=收入 2=支出
     * @param int    $value   变动值（正数）
     * @param string $remark  备注
     * @param int    $ruleId  关联规则ID（默认0）
     * @return array [bool, string]
     */
    public static function change(int $uid, int $type, int $value, string $remark = '', int $ruleId = 0): array
    {
        self::ensureSchema();
        $uid = (int) $uid;
        $value = (int) $value;
        if ($uid <= 0 || $value <= 0) {
            return [false, '参数错误'];
        }
        $type = $type === self::TYPE_SPEND ? self::TYPE_SPEND : self::TYPE_GAIN;

        Db::startTrans();
        try {
            $user = Db::name('member')->where('uid', $uid)->lock(true)->find();
            if (!$user) {
                throw new \Exception('用户不存在');
            }
            if ($type === self::TYPE_SPEND && $user['score'] < $value) {
                throw new \Exception('积分余额不足');
            }
            $balance = $type === self::TYPE_SPEND
                ? $user['score'] - $value
                : $user['score'] + $value;

            Db::name('member')->where('uid', $uid)->update(['score' => $balance]);

            Db::name('score_log')->insert([
                'uid'       => $uid,
                'rule_id'   => $ruleId,
                'type'      => $type,
                'value'     => $value,
                'balance'   => $balance,
                'remark'    => $remark,
                'create_at' => time(),
            ]);

            Db::commit();
            return [true, 'ok'];
        } catch (\Throwable $e) {
            Db::rollback();
            return [false, $e->getMessage()];
        }
    }

    /**
     * 积分流水列表（后台查看）
     */
    public static function logList(int $uid = 0, int $page = 1, int $limit = 15): array
    {
        self::ensureSchema();
        $query = Db::name('score_log');
        if ($uid > 0) {
            $query->where('uid', $uid);
        }
        $count = $query->count();
        $list = $query->order('id', 'desc')
            ->page($page, $limit)
            ->select()
            ->toArray();
        return ['count' => $count, 'list' => $list];
    }
}