<?php

namespace App\Module\Promotion\Services;

use App\Module\Promotion\Logics\ReferralLogic;
use App\Module\Promotion\Logics\RelationCacheLogic;
use App\Module\Promotion\Logics\TalentLogic;
use App\Module\Promotion\Models\PromotionUserReferral;
use Illuminate\Support\Facades\Log;

/**
 * 推荐关系服务类
 *
 * 对外提供推荐关系相关的服务，包括获取推荐关系、设置推荐关系、
 * 查询团队成员等功能。该类对外提供服务，内部调用逻辑层实现。
 */
class ReferralService
{

    /**
     * 获取用户的直接推荐人
     *
     * @param int $userId 用户ID
     * @return array|null 推荐人信息
     */
    public static function getUserReferrer(int $userId): ?array
    {
        try {
            $referralLogic = new ReferralLogic();
            $referrerId = $referralLogic->getDirectReferrerId($userId);

            if (!$referrerId) {
                return null;
            }

            // 获取推荐人信息
            $user = app('db')->table('users')->where('id', $referrerId)->first();

            if (!$user) {
                return null;
            }

            return [
                'user_id' => $user->id,
                'username' => $user->username ?? '',
                'nickname' => $user->nickname ?? '',
                'avatar' => $user->avatar ?? '',
                'created_at' => $user->created_at
            ];
        } catch (\Exception $e) {
            Log::error("获取用户推荐人失败: " . $e->getMessage());
            return null;
        }
    }

    /**
     * 获取用户的直接推荐列表
     *
     * @param int $userId 用户ID
     * @param int $page 页码
     * @param int $pageSize 每页数量
     * @return array
     */
    public static function getUserDirectReferrals(int $userId, int $page = 1, int $pageSize = 20): array
    {
        try {
            $query = PromotionUserReferral::where('referrer_id', $userId)
                ->with('user');

            $total = $query->count();

            $referrals = $query->orderBy('created_at', 'desc')
                ->offset(($page - 1) * $pageSize)
                ->limit($pageSize)
                ->get();

            $result = [];
            foreach ($referrals as $referral) {
                if ($referral->user) {
                    $result[] = [
                        'user_id' => $referral->user->id,
                        'username' => $referral->user->username ?? '',
                        'nickname' => $referral->user->nickname ?? '',
                        'avatar' => $referral->user->avatar ?? '',
                        'created_at' => $referral->created_at
                    ];
                }
            }

            return [
                'total' => $total,
                'page' => $page,
                'page_size' => $pageSize,
                'total_pages' => ceil($total / $pageSize),
                'referrals' => $result
            ];
        } catch (\Exception $e) {
            Log::error("获取用户直接推荐列表失败: " . $e->getMessage());
            return [
                'total' => 0,
                'page' => $page,
                'page_size' => $pageSize,
                'total_pages' => 0,
                'referrals' => []
            ];
        }
    }

    /**
     * 获取用户的团队成员列表
     *
     * @param int $userId 用户ID
     * @param int $page 页码
     * @param int $pageSize 每页数量
     * @param int $maxLevel 最大层级
     * @return array
     */
    public static function getUserPromotionMembers(int $userId, int $page = 1, int $pageSize = 20, int $maxLevel = 20): array
    {
        try {
            $referralLogic = new ReferralLogic();
            return $referralLogic->getAllPromotionMembers($userId, $maxLevel, $page, $pageSize);
        } catch (\Exception $e) {
            Log::error("获取用户团队成员列表失败: " . $e->getMessage());
            return [
                'total' => 0,
                'page' => $page,
                'page_size' => $pageSize,
                'total_pages' => 0,
                'members' => []
            ];
        }
    }

    /**
     * 设置用户的推荐人
     *
     * @param int $userId 用户ID
     * @param int $referrerId 推荐人ID
     * @param string $reason 设置原因
     * @param int $operatorId 操作人ID
     * @return array 包含设置结果和消息
     */
    public static function setUserReferrer(int $userId, int $referrerId, string $reason, int $operatorId): array
    {
        try {
            // 验证用户和推荐人是否存在
            $user = app('db')->table('users')->where('id', $userId)->first();
            $referrer = app('db')->table('users')->where('id', $referrerId)->first();

            if (!$user) {
                return [
                    'success' => false,
                    'message' => '用户不存在'
                ];
            }

            if (!$referrer) {
                return [
                    'success' => false,
                    'message' => '推荐人不存在'
                ];
            }

            // 检查是否自己推荐自己
            if ($userId == $referrerId) {
                return [
                    'success' => false,
                    'message' => '不能设置自己为推荐人'
                ];
            }

            $referralLogic = new ReferralLogic();
            $talentLogic = new TalentLogic($referralLogic);

            // 检查是否形成循环推荐
            if ($referralLogic->checkCircularReferral($userId, $referrerId)) {
                return [
                    'success' => false,
                    'message' => '设置此推荐人会形成循环推荐关系'
                ];
            }

            // 设置推荐关系
            $result = $referralLogic->updateReferralRelation($userId, $referrerId, $reason, $operatorId);

            if (!$result) {
                return [
                    'success' => false,
                    'message' => '设置推荐人失败'
                ];
            }

            // 更新团队统计和达人等级
            $talentLogic->updatePromotionCounts($referrerId);
            $talentLogic->checkAndUpdateTalentLevel($referrerId);

            return [
                'success' => true,
                'message' => '设置推荐人成功'
            ];
        } catch (\Exception $e) {
            Log::error("设置用户推荐人失败: " . $e->getMessage());
            return [
                'success' => false,
                'message' => '设置推荐人时发生错误: ' . $e->getMessage()
            ];
        }
    }

    /**
     * 获取用户的团队统计数据
     *
     * @param int $userId 用户ID
     * @return array
     */
    public static function getUserPromotionStats(int $userId): array
    {
        try {
            $referralLogic = new ReferralLogic();
            $talentLogic = new TalentLogic($referralLogic);
            $talent = $talentLogic->getUserTalent($userId);

            if (!$talent) {
                return [
                    'direct_count' => 0,
                    'promotion_count' => 0,
                    'talent_level' => 0
                ];
            }

            return [
                'direct_count' => $talent->direct_count,
                'promotion_count' => $talent->promotion_count,
                'talent_level' => $talent->talent_level
            ];
        } catch (\Exception $e) {
            Log::error("获取用户团队统计数据失败: " . $e->getMessage());
            return [
                'direct_count' => 0,
                'promotion_count' => 0,
                'talent_level' => 0
            ];
        }
    }

    /**
     * 重建用户的关系缓存
     *
     * @param int $userId 用户ID
     * @return bool
     */
    public static function rebuildUserRelationCache(int $userId): bool
    {
        try {
            $relationCacheLogic = new RelationCacheLogic();
            return $relationCacheLogic->generateUserRelationCache($userId);
        } catch (\Exception $e) {
            Log::error("重建用户关系缓存失败: " . $e->getMessage());
            return false;
        }
    }
}