<?php
namespace app\common\service;

use think\facade\Db;
use think\facade\Log;

class InvitationService
{
    /**
     * 生成唯一邀请码
     */
    public function generateInvitationCode(): string
    {
        $maxAttempts = 10;
        $attempts = 0;

        while ($attempts < $maxAttempts) {
            // 方法1：使用数字+字母组合
            $chars = 'ABCDEFGHJKLMNPQRSTUVWXYZ23456789'; // 去掉容易混淆的字符
            $code = '';
            for ($i = 0; $i < 6; $i++) {
                $code .= $chars[mt_rand(0, strlen($chars) - 1)];
            }

            // 方法2：或者使用更短的邀请码
            // $code = strtoupper(substr(md5(uniqid()), 0, 6));

            // 检查邀请码是否已存在
            $exists = Db::table('ba_user')
                ->where('invitation_code', $code)
                ->count();

            if (!$exists) {
                return $code;
            }

            $attempts++;

            // 如果冲突，尝试不同的算法
            if ($attempts >= 5) {
                $code = 'INV' . mt_rand(1000, 9999);
                $exists = Db::table('ba_user')
                    ->where('invitation_code', $code)
                    ->count();

                if (!$exists) {
                    return $code;
                }
            }
        }

        // 如果还是冲突，使用时间戳+随机数
        return 'INV' . time() . mt_rand(10, 99);
    }

    /**
     * 处理用户注册邀请关系（完整版）
     */
    public function processRegistration(int $newUserId, string $invitationCode = ''): bool
    {
        try {
            // 1. 为注册用户生成自己的邀请码
            $userInvitationCode = $this->generateInvitationCode();

            // 2. 将邀请码保存到用户表
            Db::table('ba_user')
                ->where('id', $newUserId)
                ->update([
                    'invitation_code' => $userInvitationCode,
                    'update_time' => time()
                ]);
            // 3. 处理邀请关系（如果提供了邀请码）
            if (!empty($invitationCode)) {
                $this->processInvitationRelationship($newUserId, $invitationCode);
            }

            // 4. 初始化用户的佣金记录
            $this->initUserCommission($newUserId);

            Log::info("用户邀请码生成成功: 用户ID={$newUserId}, 邀请码={$userInvitationCode}");

            return true;
        } catch (\Throwable $e) {
            Log::error("处理用户注册邀请关系失败: " . $e->getMessage());
            return false;
        }
    }

    /**
     * 处理邀请关系（新用户使用别人的邀请码注册）
     */
    private function processInvitationRelationship(int $newUserId, string $invitationCode): void
    {
        try {
            // 查找邀请人（通过邀请码）
            $inviter = Db::table('ba_user')
                ->where('invitation_code', $invitationCode)
                ->field('id, username')
                ->find();

            if (!$inviter) {
                Log::warning("邀请码不存在: {$invitationCode}");
                return;
            }

            // 检查是否已存在邀请关系
            $exists = Db::table('ba_user_invitation')
                ->where('invitee_id', $newUserId)
                ->find();

            if ($exists) {
                return; // 已有邀请关系，直接返回
            }

            // 创建邀请关系记录
            Db::table('ba_user_invitation')->insert([
                'inviter_id' => $inviter['id'],
                'invitee_id' => $newUserId,
                'invitation_code' => $invitationCode,
                'create_time' => date('Y-m-d H:i:s')
            ]);

            // 更新邀请人统计
            $this->updateInviterStats($inviter['id']);

            Log::info("邀请关系创建成功: 邀请人ID={$inviter['id']}, 被邀请人ID={$newUserId}");

        } catch (\Throwable $e) {
            Log::error("处理邀请关系失败: " . $e->getMessage());
        }
    }

    /**
     * 更新邀请人统计
     */
    private function updateInviterStats(int $inviterId): void
    {
        try {
            // 统计邀请人数
            $invitationCount = Db::table('ba_user_invitation')
                ->where('inviter_id', $inviterId)
                ->count();

            // 获取当前佣金记录
            $commission = Db::table('ba_user_commission')
                ->where('user_id', $inviterId)
                ->find();

            if ($commission) {
                // 更新现有记录
                Db::table('ba_user_commission')
                    ->where('user_id', $inviterId)
                    ->update([
                        'invitation_count' => $invitationCount,
                        'total_invitation' => $invitationCount,
                        'update_time' => date('Y-m-d H:i:s')
                    ]);
            } else {
                // 创建新记录（如果邀请人还没有佣金记录）
                $promotionLink = $this->generatePromotionLink($inviterId);

                Db::table('ba_user_commission')->insert([
                    'user_id' => $inviterId,
                    'total_commission' => 0.00,
                    'current_commission' => 0.00,
                    'withdrawn_commission' => 0.00,
                    'frozen_commission' => 0.00,
                    'promotion_link' => $promotionLink,
                    'invitation_count' => $invitationCount,
                    'total_invitation' => $invitationCount,
                    'update_time' => date('Y-m-d H:i:s')
                ]);
            }
        } catch (\Throwable $e) {
            Log::error("更新邀请人统计失败: " . $e->getMessage());
        }
    }

    /**
     * 初始化用户佣金记录
     */
    private function initUserCommission(int $userId): void
    {
        try {
            $exists = Db::table('ba_user_commission')
                ->where('user_id', $userId)
                ->find();

            if (!$exists) {
                $promotionLink = $this->generatePromotionLink($userId);

                Db::table('ba_user_commission')->insert([
                    'user_id' => $userId,
                    'total_commission' => 0.00,
                    'current_commission' => 0.00,
                    'withdrawn_commission' => 0.00,
                    'frozen_commission' => 0.00,
                    'promotion_link' => $promotionLink,
                    'invitation_count' => 0,
                    'total_invitation' => 0,
                    'update_time' => date('Y-m-d H:i:s')
                ]);
            }
        } catch (\Throwable $e) {
            Log::error("初始化用户佣金失败: " . $e->getMessage());
        }
    }

    /**
     * 生成推广链接
     */
    private function generatePromotionLink(int $userId): string
    {
        // 获取用户的邀请码
        $user = Db::table('ba_user')
            ->where('id', $userId)
            ->field('invitation_code')
            ->find();

        $invitationCode = $user['invitation_code'] ?? '';

        if (empty($invitationCode)) {
            // 如果用户还没有邀请码，先生成一个
            $invitationCode = $this->generateInvitationCode();
            Db::table('ba_user')
                ->where('id', $userId)
                ->update(['invitation_code' => $invitationCode]);
        }

        $domain = request()->domain();
        return $domain . '/#/user/register?invite=' . $invitationCode;
    }

    /**
     * 获取用户邀请统计
     */
    public function getUserInvitationStats(int $userId): array
    {
        try {
            // 获取用户的邀请码
            $user = Db::table('ba_user')
                ->where('id', $userId)
                ->field('invitation_code')
                ->find();

            // 获取邀请关系
            $invitations = Db::table('ba_user_invitation')
                ->alias('ui')
                ->leftJoin('ba_user u', 'u.id = ui.invitee_id')
                ->where('ui.inviter_id', $userId)
                ->field('u.id, u.username, u.email, u.mobile, u.create_time, ui.create_time as invite_time')
                ->order('ui.create_time', 'desc')
                ->select()
                ->toArray();

            // 获取佣金信息
            $commission = Db::table('ba_user_commission')
                ->where('user_id', $userId)
                ->find();

            // 获取佣金流水
            $flows = Db::table('ba_commission_flow')
                ->where('user_id', $userId)
                ->order('create_time', 'desc')
                ->limit(20)
                ->select()
                ->toArray();

            return [
                'invitation_code' => $user['invitation_code'] ?? '', // 用户的邀请码
                'invitations' => $invitations,
                'invitation_count' => count($invitations),
                'commission' => $commission ?: [
                    'total_commission' => 0,
                    'current_commission' => 0,
                    'withdrawn_commission' => 0,
                    'frozen_commission' => 0,
                    'promotion_link' => $this->generatePromotionLink($userId),
                    'invitation_count' => 0,
                    'total_invitation' => 0
                ],
                'flows' => $flows
            ];
        } catch (\Throwable $e) {
            Log::error("获取用户邀请统计失败: " . $e->getMessage());
            return [
                'invitation_code' => '',
                'invitations' => [],
                'invitation_count' => 0,
                'commission' => [
                    'total_commission' => 0,
                    'current_commission' => 0,
                    'withdrawn_commission' => 0,
                    'frozen_commission' => 0,
                    'promotion_link' => $this->generatePromotionLink($userId),
                    'invitation_count' => 0,
                    'total_invitation' => 0
                ],
                'flows' => []
            ];
        }
    }

    /**
     * 获取下级用户列表
     */
    public function getSubordinateList(int $userId, int $page = 1, int $pageSize = 10): array
    {
        try {
            $query = Db::table('ba_user_invitation')
                ->alias('ui')
                ->leftJoin('ba_user u', 'u.id = ui.invitee_id')
                ->where('ui.inviter_id', $userId);

            $total = $query->count();

            $list = $query->field('u.id, u.username, u.nickname, u.email, u.mobile, u.create_time, 
                    u.last_login_time, u.status, ui.create_time as invite_time')
                ->page($page, $pageSize)
                ->order('ui.create_time', 'desc')
                ->select()
                ->toArray();

            return [
                'list' => $list,
                'total' => $total,
                'page' => $page,
                'page_size' => $pageSize,
                'page_count' => ceil($total / $pageSize)
            ];
        } catch (\Throwable $e) {
            Log::error("获取下级用户列表失败: " . $e->getMessage());
            return [
                'list' => [],
                'total' => 0,
                'page' => $page,
                'page_size' => $pageSize,
                'page_count' => 0
            ];
        }
    }
}