<?php
declare(strict_types=1);

namespace app\services\hjf;

use app\dao\hjf\PointsReleaseLogDao;
use app\dao\user\UserDao;
use app\services\agent\AgentLevelServices;
use app\services\BaseServices;
use app\services\user\UserBillServices;
use think\annotation\Inject;
use think\facade\Db;
use think\facade\Log;

/**
 * 积分奖励服务（级差计算）—— 改造复用版
 *
 * 改造要点（PRD 3.2.2）：
 *   - 使用 eb_user.agent_level (FK → eb_agent_level.id) 获取会员等级
 *   - 从 eb_agent_level 表的 direct_reward_points / umbrella_reward_points 字段读取奖励积分
 *   - 不再使用独立的 member_level 字段和系统配置表中的 hjf_reward_* 键
 *
 * Class PointsRewardServices
 * @package app\services\hjf
 */
class PointsRewardServices extends BaseServices
{
    #[Inject]
    protected PointsReleaseLogDao $logDao;

    #[Inject]
    protected UserDao $userDao;

    #[Inject]
    protected AgentLevelServices $agentLevelServices;

    #[Inject]
    protected UserBillServices $userBillServices;

    /**
     * 对一笔报单订单发放积分奖励
     *
     * @param int   $orderDbId        订单表主键 id，用于 user_bill.link_id 关联后台订单
     * @param array $preUpgradeLevels 升级前各用户的 agent_level 快照 [uid => level_id]，用于 B2 校验
     * @param int   $qty              订单中报单商品数量，积分按数量倍乘（B3）
     */
    public function reward(int $orderUid, string $orderId, int $orderDbId = 0, array $preUpgradeLevels = [], int $qty = 1): void
    {
        $qty = max(1, $qty);
        try {
            // 幂等检查：若该订单已有积分奖励记录则跳过，防止重复发放
            $exists = Db::name('points_release_log')
                ->where('order_id', $orderId)
                ->whereIn('type', ['reward_direct', 'reward_umbrella'])
                ->count();
            if ($exists > 0) {
                Log::info("[PointsReward] 订单 {$orderId} 已有积分奖励记录，跳过重复发放");
                return;
            }

            $buyer = $this->userDao->get($orderUid);
            if (!$buyer || !$buyer['spread_uid']) {
                return;
            }

            // 取买家自身的直推奖励积分作为级差下限，确保第一级父节点只拿差额
            $buyerLevelId      = array_key_exists($orderUid, $preUpgradeLevels)
                ? $preUpgradeLevels[$orderUid]
                : (int)($buyer['agent_level'] ?? 0);
            $buyerDirectReward = $this->agentLevelServices->getDirectRewardPoints($buyerLevelId);

            $this->propagateReward((int)$buyer['spread_uid'], $orderUid, $orderId, $buyerDirectReward, 0, $orderDbId, $preUpgradeLevels, $qty);
        } catch (\Throwable $e) {
            Log::error("[PointsReward] 积分奖励失败 orderUid={$orderUid} orderId={$orderId}: " . $e->getMessage());
        }
    }

    /**
     * 向上递归发放直推积分奖励（标准逐级级差）
     *
     * 算法：沿推荐链向上遍历，每个分销等级大于0的祖先获得
     *   max(0, 自身 direct_reward_points - 链中已见最高 direct_reward_points) * qty
     * 非分销员（grade=0）跳过但继续向上传递，$lowerDirectReward 不变。
     *
     * @param int    $uid               当前被奖励用户
     * @param int    $fromUid           触发方（下级）用户 ID
     * @param string $orderId           来源订单号
     * @param int    $lowerDirectReward 链中已被下级拿走的最高 direct_reward_points（级差下限）
     * @param int    $depth             递归深度（防止无限递归）
     * @param int    $orderDbId         订单表主键 id
     * @param array  $preUpgradeLevels  升级前各用户的 agent_level 快照 [uid => level_id]（B2）
     * @param int    $qty               报单商品数量，积分按数量倍乘（B3）
     */
    private function propagateReward(
        int    $uid,
        int    $fromUid,
        string $orderId,
        int    $lowerDirectReward,
        int    $depth = 0,
        int    $orderDbId = 0,
        array  $preUpgradeLevels = [],
        int    $qty = 1
    ): void {
        if ($depth >= 10 || $uid <= 0) {
            return;
        }

        $user = $this->userDao->get($uid);
        if (!$user) {
            return;
        }

        // fsgx B2：使用升级前的 agent_level 判断资格，避免触发升级的那笔订单就给新等级积分
        $agentLevelId = array_key_exists($uid, $preUpgradeLevels)
            ? $preUpgradeLevels[$uid]
            : (int)($user['agent_level'] ?? 0);
        $grade = $this->agentLevelServices->getGradeByLevelId($agentLevelId);

        if ($grade === 0) {
            // 非分销员：跳过奖励，但继续向上传递，$lowerDirectReward 保持不变
            if ($user['spread_uid']) {
                $this->propagateReward((int)$user['spread_uid'], $uid, $orderId, $lowerDirectReward, $depth + 1, $orderDbId, $preUpgradeLevels, $qty);
            }
            return;
        }

        $directReward = $this->agentLevelServices->getDirectRewardPoints($agentLevelId);

        // 级差：本节点只拿超出下级已取走部分的差额，再乘以数量
        // 间接上级（depth>0，即非直推父节点）受伞下奖励开关控制（hjf_umbrella_reward_enable，默认关闭）
        if ($depth > 0) {
            $umbrellaRewardEnable = (int)sys_config('hjf_umbrella_reward_enable', 0);
            $actual = $umbrellaRewardEnable ? max(0, $directReward - $lowerDirectReward) * $qty : 0;
        } else {
            $actual = max(0, $directReward - $lowerDirectReward) * $qty;
        }

        if ($actual > 0) {
            $this->grantFrozenPoints(
                $uid,
                $actual,
                $orderId,
                'reward_direct',
                '直推奖励(级差)' . " x{$qty} - 来源订单 {$orderId}",
                $orderDbId
            );
        }

        // 向上传递时，下限取当前节点与已有下限中的较大值，确保上级只拿增量
        $nextLower = max($directReward, $lowerDirectReward);
        if ($user['spread_uid']) {
            $this->propagateReward(
                (int)$user['spread_uid'],
                $uid,
                $orderId,
                $nextLower,
                $depth + 1,
                $orderDbId,
                $preUpgradeLevels,
                $qty
            );
        }
    }

    /**
     * 写入待释放积分（frozen_points）并记录明细
     */
    private function grantFrozenPoints(
        int $uid,
        int $points,
        string $orderId,
        string $type,
        string $mark,
        int $orderDbId = 0
    ): void {
        Db::transaction(function () use ($uid, $points, $orderId, $type, $mark, $orderDbId) {
            $this->userDao->bcInc($uid, 'frozen_points', (string)$points, 'uid');

            $this->logDao->save([
                'uid'      => $uid,
                'points'   => $points,
                'pm'       => 1,
                'type'     => $type,
                'title'    => ($type === 'reward_direct') ? '直推奖励' : '伞下奖励',
                'mark'     => $mark,
                'status'   => 'frozen',
                'order_id' => $orderId,
            ]);

            // PRD §3.3：营销后台积分日志读 eb_user_bill，双写待释放积分明细（不增加可消费 integral）
            $integralBalance = (int)($this->userDao->value(['uid' => $uid], 'integral') ?: 0);
            $billType = ($type === 'reward_direct') ? 'hjf_reward_direct_integral' : 'hjf_reward_umbrella_integral';
            $this->userBillServices->income($billType, $uid, $points, $integralBalance, $orderDbId, 0, $mark);
        });
    }
}