package com.xuekairui.invite.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.xuekairui.common.BusinessException;
import com.xuekairui.common.ErrorCode;
import com.xuekairui.common.ValidateUtil;
import com.xuekairui.invite.dto.*;
import com.xuekairui.invite.entity.*;
import com.xuekairui.invite.mapper.InviteCodeMapper;
import com.xuekairui.invite.mapper.InviteRelationMapper;
import com.xuekairui.user.dto.CrawlerPlatformStatsResponse;
import com.xuekairui.user.dto.CrawlerUserDetailResponse;
import com.xuekairui.user.entity.CrawlerPlatform;
import com.xuekairui.user.entity.CrawlerQuotaGrant;
import com.xuekairui.user.entity.User;
import com.xuekairui.user.mapper.CrawlerUsageLogMapper;
import com.xuekairui.user.mapper.UserMapper;
import com.xuekairui.user.service.CrawlerQuotaGrantService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.*;
import java.util.stream.Collectors;

/**
 * 邀请核心服务
 * 处理邀请码生成、邀请关系建立、奖励发放、运营手动发放等
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class InviteService {

    private final InviteConfigService inviteConfigService;
    private final InviteCodeMapper inviteCodeMapper;
    private final InviteRelationMapper inviteRelationMapper;
    private final CrawlerQuotaGrantService crawlerQuotaGrantService;
    private final UserMapper userMapper;
    private final CrawlerUsageLogMapper crawlerUsageLogMapper;
    private final com.xuekairui.user.service.MembershipService membershipService;

    /** 邀请链接基础URL，可通过配置覆盖 */
    @Value("${invite.base-url:https://app.zhijiayun.com}")
    private String inviteBaseUrl;

    /** 客户端安装包本地存储目录 */
    @Value("${invite.download-base-path:./downloads}")
    private String downloadBasePath;

    /** Windows 安装包文件名 */
    @Value("${invite.windows-filename:zhijiayun-x64.exe}")
    private String windowsFilename;

    /** macOS 安装包文件名 */
    @Value("${invite.mac-filename:zhijiayun-arm64.dmg}")
    private String macFilename;

    /** 补填邀请码有效窗口（天），默认30天 */
    @Value("${invite.bind-window-days:30}")
    private int bindWindowDays;

    // ==========================================
    // 邀请码管理
    // ==========================================

    /**
     * 获取或创建用户的邀请码
     */
    public InviteCodeResponse getOrCreateInviteCode(Long userId) {
        // 查找用户已有的有效邀请码
        InviteCode existingCode = inviteCodeMapper.selectOne(
                new LambdaQueryWrapper<InviteCode>()
                        .eq(InviteCode::getUserId, userId)
                        .eq(InviteCode::getStatus, 1)
                        .and(w -> w.isNull(InviteCode::getExpireTime)
                                .or().gt(InviteCode::getExpireTime, LocalDateTime.now()))
                        .orderByDesc(InviteCode::getCreateTime)
                        .last("LIMIT 1"));

        if (existingCode != null) {
            return toCodeResponse(existingCode);
        }

        // 创建新邀请码
        InviteConfig config = inviteConfigService.getActiveConfig();
        String code = generateUniqueCode();
        LocalDateTime expireTime = LocalDateTime.now().plusDays(config.getInviteCodeExpireDays());

        InviteCode newCode = InviteCode.builder()
                .userId(userId)
                .code(code)
                .maxUses(-1)
                .usedCount(0)
                .clickCount(0)
                .expireTime(expireTime)
                .status(1)
                .build();
        inviteCodeMapper.insert(newCode);

        log.info("用户 {} 创建邀请码: {}", userId, code);
        return toCodeResponse(newCode);
    }

    // ==========================================
    // 落地页 & 链接追踪（公开接口）
    // ==========================================

    /**
     * 获取邀请落地页数据（公开，无需登录）
     * 浏览器打开邀请链接时调用，展示邀请人信息和下载链接
     * 支持多渠道：app、wechat、miniapp、dingtalk、feishu
     *
     * @param code       邀请码
     * @param channel    渠道（可选，默认app）
     * @param userAgent  浏览器 User-Agent，用于判断桌面客户端下载包
     */
    public InvitePageResponse getInvitePage(String code, String channel, String userAgent) {
        InviteCode inviteCode = inviteCodeMapper.selectOne(
                new LambdaQueryWrapper<InviteCode>()
                        .eq(InviteCode::getCode, code));

        if (inviteCode == null) {
            throw new BusinessException(ErrorCode.INVITE_CODE_INVALID);
        }

        // 自动计入点击数（浏览器打开即算一次点击）
        inviteCode.setClickCount(inviteCode.getClickCount() + 1);
        inviteCodeMapper.updateById(inviteCode);
        log.debug("邀请落地页 {} 被访问，累计点击 {} 次", code, inviteCode.getClickCount());

        // 获取邀请人信息
        User inviter = userMapper.selectById(inviteCode.getUserId());
        String inviterNickname = getDisplayName(inviter);
        String inviterAvatar = inviter != null ? inviter.getAvatar() : null;

        // 获取配置
        InviteConfig config = inviteConfigService.getActiveConfig();

        // 默认渠道（当前主推 Windows 桌面客户端）
        if (channel == null || channel.isBlank()) {
            channel = "windows";
        }

        // 根据渠道确定打开方式
        String openType = determineOpenType(channel, config);

        // 构建小程序路径（含邀请码参数）
        String miniappPath = config.getMiniappPath();
        if (miniappPath != null && !miniappPath.contains("?")) {
            miniappPath = miniappPath + "?inviteCode=" + code;
        } else if (miniappPath != null) {
            miniappPath = miniappPath + "&inviteCode=" + code;
        }

        // 生成URL Scheme和DeepLink（用于客户端自动填入邀请码）
        String urlScheme = "zhijiayun://invite?code=" + code;
        String deepLink = "https://app.zhijiayun.com/invite/" + code + "?autoFill=true";
        
        // 根据渠道生成提示文案
        String instructionText = generateInstructionText(code, channel, config);

        // 落地页下载按钮指向 /api/invite/{code}，服务端按设备流式返回对应安装包
        String inviteDownloadUrl = inviteBaseUrl + "/api/invite/" + code;

        // Windows/app 渠道使用邀请链接作为下载入口（自动识别设备并重定向），其他渠道保持配置中的下载地址
        String appDownloadUrl = ("windows".equals(channel) || "app".equals(channel))
                ? inviteDownloadUrl
                : config.getAppDownloadUrl();

        // 处理落地页标题：支持 {inviter} 和 {pharmacy} 占位符
        String landingTitle = config.getLandingTitle();
        if (landingTitle == null || landingTitle.isBlank()) {
            // 没有配置时，使用邀请人+药店名（如有）个性化展示
            String pharmacyName = inviter != null ? inviter.getPharmacyName() : null;
            if (pharmacyName != null && !pharmacyName.isBlank()) {
                landingTitle = inviterNickname + " · " + pharmacyName + " 邀请您使用";
            } else {
                landingTitle = inviterNickname + " 邀请您使用" + config.getAppName();
            }
        } else {
            // 替换占位符
            if (landingTitle.contains("{inviter}")) {
                landingTitle = landingTitle.replace("{inviter}", inviterNickname);
            }
            if (inviter != null && inviter.getPharmacyName() != null
                    && landingTitle.contains("{pharmacy}")) {
                landingTitle = landingTitle.replace("{pharmacy}", inviter.getPharmacyName());
            }
        }

        return InvitePageResponse.builder()
                .inviterNickname(inviterNickname)
                .inviterAvatar(inviterAvatar)
                .inviteCode(code)
                .channel(channel)
                .openType(openType)
                .appName(config.getAppName())
                .landingTitle(landingTitle)
                .landingDesc(config.getLandingDesc())
                // 渠道特定字段
                .appDownloadUrl(appDownloadUrl)
                .miniappPath(miniappPath)
                .miniappAppId(config.getMiniappAppId())
                .wechatRedirectUrl(config.getWechatRedirectUrl())
                .dingtalkAppId(config.getDingtalkAppId())
                .feishuAppId(config.getFeishuAppId())
                .rewardPerRegister(config.getRewardMonths() != null ? config.getRewardMonths() : 1)
                // 新增：自动填入支持
                .autoFillSupported(true)
                .urlScheme(urlScheme)
                .deepLink(deepLink)
                .instructionText(instructionText)
                .build();
    }

    /**
     * 根据渠道生成操作提示文案
     *
     * @param code    邀请码
     * @param channel 渠道
     * @param config  邀请配置
     */
    private String generateInstructionText(String code, String channel, InviteConfig config) {
        return switch (channel) {
            case "windows" -> "下载安装Windows客户端后，在注册页面输入邀请码：" + code + " 或点击链接自动填入";
            case "app" -> "下载安装客户端后，在注册页面输入邀请码：" + code + " 或点击链接自动填入";
            case "miniapp" -> "点击按钮打开小程序，邀请码已自动填入";
            case "wechat" -> "关注公众号后，在菜单中输入邀请码：" + code + " 完成注册";
            case "dingtalk" -> "打开钉钉应用，搜索\"" + config.getAppName() + "\"并输入邀请码：" + code;
            case "feishu" -> "打开飞书应用，搜索\"" + config.getAppName() + "\"并输入邀请码：" + code;
            default -> "下载客户端后，在注册页面输入邀请码：" + code + " 即可享受奖励";
        };
    }

    /**
     * 根据渠道确定打开方式
     */
    private String determineOpenType(String channel, InviteConfig config) {
        return switch (channel) {
            case "windows" -> "download";   // 下载Windows桌面客户端
            case "app" -> "download";       // 下载客户端（移动端通用）
            case "miniapp" -> "miniapp";    // 打开小程序
            case "wechat" -> "redirect";    // 跳转公众号/H5
            case "dingtalk" -> "deeplink";  // 应用内深度链接
            case "feishu" -> "deeplink";    // 应用内深度链接
            default -> "download";
        };
    }

    /**
     * 根据 User-Agent 解析本次应下载的安装包文件
     * Windows x64 -> {downloadBasePath}/智价云-x64.exe
     * macOS ARM64 -> {downloadBasePath}/智价云-arm64.dmg
     * 其他默认返回 Windows 安装包
     */
    public java.io.File resolveDownloadFile(String userAgent) {
        String filename = windowsFilename;
        if (userAgent != null) {
            String ua = userAgent.toLowerCase();
            boolean isMac = ua.contains("macintosh") || ua.contains("mac os");
            boolean isArm = ua.contains("arm64") || ua.contains("aarch64");
            if (isMac && isArm) {
                filename = macFilename;
            }
        }
        return new java.io.File(downloadBasePath, filename);
    }

    /**
     * 构造支持中文文件名的 Content-Disposition 响应头
     * 使用 RFC 5987 的 filename*=UTF-8'' 编码，兼容主流浏览器
     */
    private String buildContentDisposition(String filename) {
        String asciiOnly = filename.replaceAll("[^\\x00-\\x7F]", "_");
        String encoded = java.net.URLEncoder.encode(filename, java.nio.charset.StandardCharsets.UTF_8)
                .replaceAll("\\+", "%20");
        return "attachment; filename=\"" + asciiOnly + "\"; filename*=UTF-8''" + encoded;
    }

    /**
     * 流式下载邀请链接对应的安装包（公开，无需登录）
     * 自动计入点击数，并根据 User-Agent 选择安装包文件写入响应流
     */
    public void downloadInviteFile(String code, String userAgent, jakarta.servlet.http.HttpServletResponse response) {
        // 校验邀请码存在性并记录点击
        InviteCode inviteCode = inviteCodeMapper.selectOne(
                new LambdaQueryWrapper<InviteCode>()
                        .eq(InviteCode::getCode, code));
        if (inviteCode == null) {
            throw new BusinessException(ErrorCode.INVITE_CODE_INVALID);
        }
        inviteCode.setClickCount(inviteCode.getClickCount() + 1);
        inviteCodeMapper.updateById(inviteCode);
        log.debug("下载链接 {} 被访问，累计点击 {} 次", code, inviteCode.getClickCount());

        java.io.File file = resolveDownloadFile(userAgent);
        if (!file.exists() || !file.isFile()) {
            log.error("安装包文件不存在: {}", file.getAbsolutePath());
            throw new BusinessException(ErrorCode.BUSINESS_ERROR, "安装包文件不存在，请联系管理员");
        }

        response.setContentType("application/octet-stream");
        response.setHeader("Content-Disposition", buildContentDisposition(file.getName()));
        response.setContentLengthLong(file.length());

        try (java.io.InputStream in = new java.io.FileInputStream(file);
             java.io.OutputStream out = response.getOutputStream()) {
            byte[] buffer = new byte[8192];
            int len;
            while ((len = in.read(buffer)) != -1) {
                out.write(buffer, 0, len);
            }
            out.flush();
        } catch (java.io.IOException e) {
            log.error("流式下载安装包失败: {}", file.getAbsolutePath(), e);
            throw new BusinessException(ErrorCode.BUSINESS_ERROR, "下载失败，请重试");
        }
    }

    /**
     * 追踪邀请链接被打开（公开，浏览器打开时调用）
     * 记录到 invite_code.click_count
     */
    public void trackClick(String code) {
        InviteCode inviteCode = inviteCodeMapper.selectOne(
                new LambdaQueryWrapper<InviteCode>()
                        .eq(InviteCode::getCode, code));

        if (inviteCode != null) {
            inviteCode.setClickCount(inviteCode.getClickCount() + 1);
            inviteCodeMapper.updateById(inviteCode);
            log.debug("邀请链接 {} 被打开，累计 {} 次", code, inviteCode.getClickCount());
        }
    }

    /**
     * 解析任意邀请链接或邀请码，返回邀请人信息
     * 支持：
     * 1. 纯邀请码：A3K7M9P2
     * 2. 完整邀请链接：https://app.zhijiayun.com/invite/A3K7M9P2?channel=wechat
     * 3. 带查询参数的链接：...?inviteCode=A3K7M9P2 或 ?code=A3K7M9P2
     */
    public InviteLinkResolveResponse resolveInviteLink(String linkOrCode) {
        if (linkOrCode == null || linkOrCode.isBlank()) {
            throw new BusinessException(ErrorCode.PARAM_ERROR, "邀请链接或邀请码不能为空");
        }

        String trimmed = linkOrCode.trim();
        String code = extractInviteCode(trimmed);
        if (code == null || code.isBlank()) {
            log.warn("邀请链接解析失败，无法提取邀请码: input={}", trimmed);
            throw new BusinessException(ErrorCode.INVITE_CODE_INVALID,
                    "无法从输入内容中识别出邀请码，请确认输入的是邀请码或邀请链接");
        }

        InviteCode inviteCode = inviteCodeMapper.selectOne(
                new LambdaQueryWrapper<InviteCode>()
                        .eq(InviteCode::getCode, code));

        if (inviteCode == null) {
            log.warn("邀请码在数据库中不存在: code={}", code);
            throw new BusinessException(ErrorCode.INVITE_CODE_INVALID,
                    "邀请码 " + code + " 不存在或已失效");
        }

        User inviter = userMapper.selectById(inviteCode.getUserId());
        String inviterNickname = getDisplayName(inviter);
        String inviterAvatar = inviter != null ? inviter.getAvatar() : null;

        InviteConfig config = inviteConfigService.getActiveConfig();
        String landingTitle = config.getLandingTitle();
        if (landingTitle == null || landingTitle.isBlank()) {
            String pharmacyName = inviter != null ? inviter.getPharmacyName() : null;
            if (pharmacyName != null && !pharmacyName.isBlank()) {
                landingTitle = inviterNickname + " · " + pharmacyName + " 邀请您使用";
            } else {
                landingTitle = inviterNickname + " 邀请您使用" + config.getAppName();
            }
        } else {
            if (landingTitle.contains("{inviter}")) {
                landingTitle = landingTitle.replace("{inviter}", inviterNickname);
            }
            if (inviter != null && inviter.getPharmacyName() != null
                    && landingTitle.contains("{pharmacy}")) {
                landingTitle = landingTitle.replace("{pharmacy}", inviter.getPharmacyName());
            }
        }

        return InviteLinkResolveResponse.builder()
                .inviteCode(code)
                .inviteLink(inviteBaseUrl + "/api/invite/" + code)
                .inviterNickname(inviterNickname)
                .inviterAvatar(inviterAvatar)
                .appName(config.getAppName())
                .landingTitle(landingTitle)
                .landingDesc(config.getLandingDesc())
                .build();
    }

    /**
     * 从链接或邀请码字符串中提取邀请码
     * 支持：纯邀请码、完整URL路径、query参数、以及被截断/编码的URL
     */
    private String extractInviteCode(String linkOrCode) {
        // 1. 纯邀请码：8位（去掉了易混淆的 I,O,0,1）
        if (linkOrCode.matches("^[A-HJ-NP-Z2-9]{8}$")) {
            log.debug("提取邀请码[纯码匹配]: {}", linkOrCode);
            return linkOrCode;
        }

        // 2. 从路径 /invite/{code} 提取（兼容各种端口、域名）
        java.util.regex.Pattern pathPattern = java.util.regex.Pattern
                .compile("/invite/([A-HJ-NP-Z2-9]{8})(?:[?/#]|$)");
        java.util.regex.Matcher pathMatcher = pathPattern.matcher(linkOrCode);
        if (pathMatcher.find()) {
            String code = pathMatcher.group(1);
            log.debug("提取邀请码[路径匹配]: {} from {}", code, linkOrCode);
            return code;
        }

        // 3. 从查询参数 ?inviteCode=XXX 或 ?code=XXX 提取
        java.util.regex.Pattern queryPattern = java.util.regex.Pattern
                .compile("[?&](?:inviteCode|code)=([A-HJ-NP-Z2-9]{8})(?:&|$|#)");
        java.util.regex.Matcher queryMatcher = queryPattern.matcher(linkOrCode);
        if (queryMatcher.find()) {
            return queryMatcher.group(1);
        }

        // 4. 兜底：从任意位置提取符合格式的8位邀请码（处理URL被截断、编码等异常情况）
        java.util.regex.Pattern fallbackPattern = java.util.regex.Pattern
                .compile("([A-HJ-NP-Z2-9]{8})");
        java.util.regex.Matcher fallbackMatcher = fallbackPattern.matcher(linkOrCode);
        if (fallbackMatcher.find()) {
            return fallbackMatcher.group(1);
        }

        return null;
    }

    // ==========================================
    // 邀请注册处理
    // ==========================================

    /**
     * 通过邀请码注册（新用户注册时调用）
     * @param inviteCodeStr 邀请码
     * @param inviteeId 新用户ID
     */
    @Transactional
    public void processInviteRegistration(String inviteCodeStr, Long inviteeId) {
        if (inviteCodeStr == null || inviteCodeStr.isBlank()) {
            return; // 没有邀请码，跳过
        }

        // 1. 查找邀请码
        InviteCode inviteCode = inviteCodeMapper.selectOne(
                new LambdaQueryWrapper<InviteCode>()
                        .eq(InviteCode::getCode, inviteCodeStr));

        if (inviteCode == null) {
            log.warn("邀请码无效: {}", inviteCodeStr);
            return; // 邀请码无效，不阻断注册
        }

        // 2. 校验邀请码状态
        if (inviteCode.getStatus() != 1) {
            log.warn("邀请码已禁用: {}", inviteCodeStr);
            return;
        }
        if (inviteCode.getExpireTime() != null && inviteCode.getExpireTime().isBefore(LocalDateTime.now())) {
            log.warn("邀请码已过期: {}", inviteCodeStr);
            return;
        }
        if (inviteCode.getMaxUses() != -1 && inviteCode.getUsedCount() >= inviteCode.getMaxUses()) {
            log.warn("邀请码已达使用上限: {}", inviteCodeStr);
            return;
        }

        Long inviterId = inviteCode.getUserId();

        // 3. 不能邀请自己
        if (inviterId.equals(inviteeId)) {
            throw new BusinessException(ErrorCode.INVITE_SELF_FORBIDDEN);
        }

        // 4. 检查是否已被邀请过（每个用户只能被邀请一次）
        Long existingCount = inviteRelationMapper.selectCount(
                new LambdaQueryWrapper<InviteRelation>()
                        .eq(InviteRelation::getInviteeId, inviteeId));
        if (existingCount > 0) {
            log.warn("用户 {} 已被邀请过", inviteeId);
            return;
        }

        // 5. 获取邀请配置
        InviteConfig config = inviteConfigService.getActiveConfig();
        if (config.getStatus() != 1) {
            log.warn("邀请功能已停用");
            return;
        }

        // 5.1 检查邀请人总邀请奖励上限（仍可继续邀请，但超过上限后不再发放奖励）
        Long totalInvited = inviteRelationMapper.selectCount(
                new LambdaQueryWrapper<InviteRelation>()
                        .eq(InviteRelation::getInviterId, inviterId)
                        .eq(InviteRelation::getRegistered, 1));
        int maxTotal = config.getMaxTotalInvites() != null ? config.getMaxTotalInvites() : 30;
        boolean rewardAllowed = totalInvited < maxTotal;
        if (!rewardAllowed) {
            log.warn("邀请人{}已达会员时长奖励上限{}人，继续邀请不再发放奖励", inviterId, maxTotal);
        }

        // 6. 创建邀请关系（直接标记为已注册，奖励类型为赠送会员时长）
        Integer rewardMonths = config.getRewardMonths() != null ? config.getRewardMonths() : 1;
        InviteRelation relation = InviteRelation.builder()
                .inviterId(inviterId)
                .inviteeId(inviteeId)
                .inviteCodeId(inviteCode.getId())
                .registered(1)
                .rewardGranted(rewardAllowed ? rewardMonths : 0)
                .status(1)
                .build();
        inviteRelationMapper.insert(relation);

        // 7. 更新邀请码使用次数
        inviteCode.setUsedCount(inviteCode.getUsedCount() + 1);
        inviteCodeMapper.updateById(inviteCode);

        // 8. 给邀请人发放奖励（在奖励上限内赠送30天会员时长）
        if (rewardAllowed) {
            grantInviteReward(inviterId, inviteeId);
            log.info("邀请成功: 用户 {} 邀请了用户 {}，邀请人获赠30天会员时长", inviterId, inviteeId);
        } else {
            log.info("邀请成功: 用户 {} 邀请了用户 {}，已达奖励上限，不发放会员时长", inviterId, inviteeId);
        }
    }

    /**
     * 补填邀请码（注册时未填，注册后有效窗口内可补填）
     * 补填成功后：被邀请人额外获赠1个月普通会员，邀请人获赠1个月同等级会员时长
     *
     * @param userId           当前登录用户ID
     * @param inviteCodeInput  邀请码或邀请链接
     * @return 成功提示信息
     */
    @Transactional
    public String bindInviteCode(Long userId, String inviteCodeInput) {
        if (inviteCodeInput == null || inviteCodeInput.isBlank()) {
            throw new BusinessException(ErrorCode.PARAM_ERROR, "邀请码不能为空");
        }

        // 1. 提取邀请码（支持纯码或链接）
        String inviteCodeStr = extractInviteCode(inviteCodeInput.trim());
        if (inviteCodeStr == null || inviteCodeStr.isBlank()) {
            throw new BusinessException(ErrorCode.INVITE_CODE_INVALID, "无法识别邀请码，请检查输入");
        }

        // 2. 查找邀请码
        InviteCode inviteCode = inviteCodeMapper.selectOne(
                new LambdaQueryWrapper<InviteCode>()
                        .eq(InviteCode::getCode, inviteCodeStr));
        if (inviteCode == null) {
            throw new BusinessException(ErrorCode.INVITE_CODE_INVALID);
        }

        // 3. 校验邀请码状态
        if (inviteCode.getStatus() != 1) {
            throw new BusinessException(ErrorCode.INVITE_CODE_INVALID, "邀请码已禁用");
        }
        if (inviteCode.getExpireTime() != null && inviteCode.getExpireTime().isBefore(LocalDateTime.now())) {
            throw new BusinessException(ErrorCode.INVITE_CODE_EXPIRED);
        }

        Long inviterId = inviteCode.getUserId();

        // 4. 不能邀请自己
        if (inviterId.equals(userId)) {
            throw new BusinessException(ErrorCode.INVITE_SELF_FORBIDDEN);
        }

        // 5. 检查是否已被邀请过（每个用户只能被邀请一次）
        Long existingCount = inviteRelationMapper.selectCount(
                new LambdaQueryWrapper<InviteRelation>()
                        .eq(InviteRelation::getInviteeId, userId));
        if (existingCount > 0) {
            throw new BusinessException(ErrorCode.INVITE_RELATION_EXISTS, "您已绑定过邀请码，无法重复绑定");
        }

        // 6. 检查注册时间是否在有效窗口内
        User user = userMapper.selectById(userId);
        if (user == null) {
            throw new BusinessException(ErrorCode.USER_NOT_FOUND);
        }
        if (user.getCreateTime() == null) {
            throw new BusinessException(ErrorCode.BUSINESS_ERROR, "用户注册时间缺失，无法补填");
        }
        LocalDateTime deadline = user.getCreateTime().plusDays(bindWindowDays);
        if (LocalDateTime.now().isAfter(deadline)) {
            throw new BusinessException(ErrorCode.INVITE_BIND_EXPIRED,
                    String.format("注册已超过%d天，无法补填邀请码", bindWindowDays));
        }

        // 7. 获取邀请配置
        InviteConfig config = inviteConfigService.getActiveConfig();
        if (config.getStatus() != 1) {
            throw new BusinessException(ErrorCode.BUSINESS_ERROR, "邀请功能已停用");
        }

        // 7.1 检查邀请人总邀请奖励上限（仍可继续绑定，但超过上限后不再发放奖励）
        Long totalInvited = inviteRelationMapper.selectCount(
                new LambdaQueryWrapper<InviteRelation>()
                        .eq(InviteRelation::getInviterId, inviterId)
                        .eq(InviteRelation::getRegistered, 1));
        int maxTotal = config.getMaxTotalInvites() != null ? config.getMaxTotalInvites() : 30;
        boolean rewardAllowed = totalInvited < maxTotal;

        // 8. 创建邀请关系
        Integer rewardMonths = config.getRewardMonths() != null ? config.getRewardMonths() : 1;
        InviteRelation relation = InviteRelation.builder()
                .inviterId(inviterId)
                .inviteeId(userId)
                .inviteCodeId(inviteCode.getId())
                .registered(1)
                .rewardGranted(rewardAllowed ? rewardMonths : 0)
                .status(1)
                .build();
        inviteRelationMapper.insert(relation);

        // 9. 更新邀请码使用次数
        inviteCode.setUsedCount(inviteCode.getUsedCount() + 1);
        inviteCodeMapper.updateById(inviteCode);

        // 10. 发放奖励：邀请人30天会员时长（在奖励上限内）
        if (rewardAllowed) {
            membershipService.grantInviteRewardMembership(inviterId, userId);
            log.info("补填邀请码成功: 用户{}绑定邀请码{}，邀请人{}，邀请人获赠30天会员时长",
                    userId, inviteCodeStr, inviterId);
            return "补填邀请码成功！邀请人获赠1个月会员时长";
        } else {
            log.info("补填邀请码成功: 用户{}绑定邀请码{}，邀请人{}，已达奖励上限，不发放会员时长",
                    userId, inviteCodeStr, inviterId);
            return "补填邀请码成功！邀请人已达奖励上限，本次不发放会员时长";
        }
    }

    /**
     * 发放邀请奖励：邀请人30天高级会员
     */
    private void grantInviteReward(Long inviterId, Long inviteeId) {
        membershipService.grantInviteRewardMembership(inviterId, inviteeId);
    }

    // ==========================================
    // 运营手动发放
    // ==========================================

    /**
     * 运营手动发放爬虫次数（通过统一配额服务）
     */
    @Transactional
    public CrawlerQuotaGrant adminGrantQuota(QuotaGrantRequest request) {
        return crawlerQuotaGrantService.grantAdminQuota(
                request.getUserId(),
                request.getQuotaCount(),
                request.getExpireTime(),
                request.getRemark());
    }

    // ==========================================
    // 统计 & 记录查询
    // ==========================================

    /**
     * 获取用户邀请统计
     * 返回如："已邀请5人，3人注册 +21次"
     */
    public InviteStatsResponse getInviteStats(Long userId) {
        InviteConfig config = inviteConfigService.getActiveConfig();

        // 获取用户邀请码
        InviteCodeResponse codeResponse = getOrCreateInviteCode(userId);

        // 所有邀请记录
        List<InviteRelation> allRelations = inviteRelationMapper.selectList(
                new LambdaQueryWrapper<InviteRelation>()
                        .eq(InviteRelation::getInviterId, userId));

        // 已邀请人数（所有记录）
        int totalInvited = allRelations.size();

        // 已注册人数
        int registeredCount = (int) allRelations.stream()
                .filter(r -> r.getRegistered() != null && r.getRegistered() == 1)
                .count();

        // 累计奖励
        int totalReward = allRelations.stream()
                .mapToInt(InviteRelation::getRewardGranted)
                .sum();

        // 链接被打开次数（直接从已查到的邀请码响应中取，无需重复查库）
        int clickedCount = codeResponse.getClickCount() != null ? codeResponse.getClickCount() : 0;

        // 今日邀请数
        LocalDateTime todayStart = LocalDate.now().atStartOfDay();
        Long todayInvited = inviteRelationMapper.selectCount(
                new LambdaQueryWrapper<InviteRelation>()
                        .eq(InviteRelation::getInviterId, userId)
                        .ge(InviteRelation::getCreateTime, todayStart));

        int todayRemaining = Math.max(0, config.getMaxInvitePerDay() - todayInvited.intValue());

        // 生成摘要文本（每邀请1家注册 = 邀请人获1个月会员）
        String summaryText = String.format("已邀请%d家药店，%d家注册，累计获得%d个月高级会员",
                totalInvited, registeredCount, registeredCount);

        return InviteStatsResponse.builder()
                .myInviteCode(codeResponse.getCode())
                .inviteLink(codeResponse.getInviteLink())
                .clickedCount(clickedCount)
                .totalInvited(totalInvited)
                .registeredCount(registeredCount)
                .totalReward(totalReward)
                .summaryText(summaryText)
                .todayInvited(todayInvited.intValue())
                .todayRemaining(todayRemaining)
                .rewardPerInvite(config.getRewardMonths() != null ? config.getRewardMonths() : 1)
                .build();
    }

    /**
     * 获取用户邀请记录列表
     */
    public List<InviteRewardResponse> getInviteRewards(Long userId) {
        List<InviteRelation> relations = inviteRelationMapper.selectList(
                new LambdaQueryWrapper<InviteRelation>()
                        .eq(InviteRelation::getInviterId, userId)
                        .orderByDesc(InviteRelation::getCreateTime));

        return relations.stream().map(r -> {
            boolean isRegistered = r.getRegistered() != null && r.getRegistered() == 1;
            User invitee = userMapper.selectById(r.getInviteeId());
            String inviteeNickname = isRegistered
                    ? getDisplayName(invitee)
                    : "待注册";

            return InviteRewardResponse.builder()
                    .inviterId(r.getInviterId())
                    .inviterNickname(getUserNickname(r.getInviterId()))
                    .inviteeId(r.getInviteeId())
                    .inviteeNickname(inviteeNickname)
                    .registered(r.getRegistered() != null ? r.getRegistered() : 0)
                    .registeredText(isRegistered ? "已注册" : "待注册")
                    .rewardCount(r.getRewardGranted())
                    .inviteTime(r.getCreateTime() != null ?
                            r.getCreateTime().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")) : null)
                    .build();
        }).collect(Collectors.toList());
    }

    /**
     * 查询是谁邀请了我（被邀请人视角）
     * 从 t_invite_relation 中查找 inviteeId = 当前用户的记录
     */
    public MyInviterResponse getMyInviter(Long userId) {
        InviteRelation relation = inviteRelationMapper.selectOne(
                new LambdaQueryWrapper<InviteRelation>()
                        .eq(InviteRelation::getInviteeId, userId)
                        .orderByDesc(InviteRelation::getCreateTime)
                        .last("LIMIT 1"));

        if (relation == null) {
            return MyInviterResponse.builder()
                    .invited(false)
                    .build();
        }

        User inviter = userMapper.selectById(relation.getInviterId());
        InviteCode inviteCode = relation.getInviteCodeId() != null
                ? inviteCodeMapper.selectById(relation.getInviteCodeId())
                : null;

        return MyInviterResponse.builder()
                .invited(true)
                .inviterId(relation.getInviterId())
                .inviterNickname(getDisplayName(inviter))
                .inviterPhone(inviter != null ? ValidateUtil.maskPhone(inviter.getPhone()) : null)
                .inviterAvatar(inviter != null ? inviter.getAvatar() : null)
                .pharmacyName(inviter != null ? inviter.getPharmacyName() : null)
                .inviteCode(inviteCode != null ? inviteCode.getCode() : null)
                .inviteTime(relation.getCreateTime() != null ?
                        relation.getCreateTime().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")) : null)
                .build();
    }

    /**
     * 获取用户可用的额外爬虫次数
     */
    public int getAvailableExtraQuota(Long userId) {
        return crawlerQuotaGrantService.getAvailableExtraQuota(userId);
    }

    /**
     * 获取发放记录列表
     */
    public List<CrawlerQuotaGrant> listGrants(Long userId, String grantType) {
        return crawlerQuotaGrantService.listGrants(userId, grantType);
    }

    // ==========================================
    // 私有工具方法
    // ==========================================

    /**
     * 生成唯一邀请码（8位大写字母+数字）
     * 字符集：ABCDEFGHJKLMNPQRSTUVWXYZ23456789（去掉易混淆字符 I,O,0,1）
     * 示例：A3K7M9P2、X5B8N4Q6
     */
    private String generateUniqueCode() {
        String chars = "ABCDEFGHJKLMNPQRSTUVWXYZ23456789"; // 32个字符，去掉易混淆的
        java.security.SecureRandom random = new java.security.SecureRandom();
        String code;
        
        do {
            StringBuilder sb = new StringBuilder(8);
            for (int i = 0; i < 8; i++) {
                sb.append(chars.charAt(random.nextInt(chars.length())));
            }
            code = sb.toString();
        } while (inviteCodeMapper.selectCount(
                new LambdaQueryWrapper<InviteCode>().eq(InviteCode::getCode, code)) > 0);
        
        return code;
    }

    /**
     * 获取用户昵称
     */
    /**
     * 获取用户对外展示名：
     * 优先顺序：微信昵称 > 用户自定义昵称 > 手机尾号 > 兜底文案
     */
    private String getDisplayName(User user) {
        if (user == null) {
            return "一位药店用户";
        }
        if (user.getWechatNickname() != null && !user.getWechatNickname().isBlank()) {
            return user.getWechatNickname();
        }
        if (user.getNickname() != null && !user.getNickname().isBlank()) {
            return user.getNickname();
        }
        if (user.getPhone() != null && user.getPhone().length() >= 4) {
            return "手机尾号" + user.getPhone().substring(user.getPhone().length() - 4);
        }
        return "一位药店用户";
    }

    /**
     * 根据用户ID获取展示名
     */
    private String getUserNickname(Long userId) {
        return getDisplayName(userMapper.selectById(userId));
    }

    /**
     * 实体转响应（含邀请链接）
     */
    private InviteCodeResponse toCodeResponse(InviteCode code) {
        // 获取配置与邀请人信息
        InviteConfig config = inviteConfigService.getActiveConfig();
        User inviter = userMapper.selectById(code.getUserId());
        String inviterNickname = getDisplayName(inviter);
        String inviteLink = inviteBaseUrl + "/api/invite/" + code.getCode();

        // 生成分享文案（邀请人 + 产品价值 + 操作指引）
        // 分享标题：让接收方一眼知道是谁邀请的
        String shareTitle = inviterNickname + " 邀请你加入" + config.getAppName();
        // 分享描述：说明产品核心价值（绑定B2B平台→聚合查价）
        String shareDescription = config.getLandingDesc() != null
                && !config.getLandingDesc().isBlank()
                ? config.getLandingDesc() : "注册登录" + config.getAppName() + "平台，聚合比价查低价";
        String rewardDesc = "邀请人每成功邀请1家药店注册，赠送1个月高级会员时长";

        // 邀请链接即下载入口，访问后根据对方设备自动重定向到对应安装包
        String downloadLink = inviteLink;

        // 复制文本：与示例文案保持一致，便于用户一键转发
        String copyText = String.format(
            "我是%s，在这里发现了一个药店采购神器——%s！它聚合比价功能特别方便，能快速查到最低价，帮你节省采购成本。下载链接%s填我的邀请码 %s 完成注册，你也会获得会员权益！",
            inviterNickname,
            config.getAppName(),
            downloadLink,
            code.getCode()
        );

        return InviteCodeResponse.builder()
                .code(code.getCode())
                .inviteLink(inviteLink)
                .downloadUrl(inviteLink)
                .inviterNickname(inviterNickname)
                .clickCount(code.getClickCount() != null ? code.getClickCount() : 0)
                .usedCount(code.getUsedCount())
                .maxUses(code.getMaxUses())
                .expireTime(code.getExpireTime())
                .status(code.getStatus())
                .createTime(code.getCreateTime())
                // 新增分享字段
                .shareTitle(shareTitle)
                .shareDescription(shareDescription)
                .copyText(copyText)
                .rewardDescription(rewardDesc)
                .build();
    }

    // ==========================================
    // 新增：用户爬虫详情查询
    // ==========================================

    /**
     * 获取用户爬虫使用详情（含平台分布统计）
     */
    public CrawlerUserDetailResponse getCrawlerUserDetail(Long userId) {
        User user = userMapper.selectById(userId);
        if (user == null) {
            throw new BusinessException(ErrorCode.USER_NOT_FOUND);
        }

        // 获取总使用次数
        int todayTotal = crawlerUsageLogMapper.sumTodayUsage(userId);
        int monthlyTotal = crawlerUsageLogMapper.sumMonthlyUsage(userId);

        // 获取各平台统计
        List<Map<String, Object>> todayByPlatform = crawlerUsageLogMapper.sumTodayUsageByPlatform(userId);
        List<Map<String, Object>> monthlyByPlatform = crawlerUsageLogMapper.sumMonthlyUsageByPlatform(userId);
        List<Map<String, Object>> totalByPlatform = crawlerUsageLogMapper.sumTotalUsageByPlatform(userId);

        // 构建平台统计Map
        Map<String, Integer> todayMap = buildPlatformMap(todayByPlatform);
        Map<String, Integer> monthlyMap = buildPlatformMap(monthlyByPlatform);
        Map<String, Integer> totalMap = buildPlatformMap(totalByPlatform);

        // 合并所有出现过的平台
        Set<String> allPlatforms = new HashSet<>();
        allPlatforms.addAll(todayMap.keySet());
        allPlatforms.addAll(monthlyMap.keySet());
        allPlatforms.addAll(totalMap.keySet());

        // 构建平台统计列表（容错处理：未知平台显示原始code+“其他平台”）
        List<CrawlerPlatformStatsResponse> platformStats = allPlatforms.stream()
                .map(platformCode -> {
                    CrawlerPlatform platform = CrawlerPlatform.findByCode(platformCode);
                    String pCode = platform != null ? platform.getCode() : platformCode;
                    String pName = platform != null ? platform.getName() : "其他平台(" + platformCode + ")";
                    return CrawlerPlatformStatsResponse.builder()
                            .platformCode(pCode)
                            .platformName(pName)
                            .todayUsage(todayMap.getOrDefault(platformCode, 0))
                            .monthlyUsage(monthlyMap.getOrDefault(platformCode, 0))
                            .totalUsage(totalMap.getOrDefault(platformCode, 0))
                            .build();
                })
                .sorted(Comparator.comparingInt(CrawlerPlatformStatsResponse::getTotalUsage).reversed())
                .collect(Collectors.toList());

        return CrawlerUserDetailResponse.builder()
                .userId(userId)
                .nickname(user.getNickname())
                .phone(ValidateUtil.maskPhone(user.getPhone()))
                .todayTotalUsage(todayTotal)
                .monthlyTotalUsage(monthlyTotal)
                .platformStats(platformStats)
                .build();
    }

    /**
     * 将平台统计结果转换为Map
     */
    private Map<String, Integer> buildPlatformMap(List<Map<String, Object>> rows) {
        Map<String, Integer> map = new HashMap<>();
        for (Map<String, Object> row : rows) {
            String platform = (String) row.get("platform");
            Number usage = (Number) row.get(row.containsKey("today_usage") ? "today_usage" 
                    : row.containsKey("monthly_usage") ? "monthly_usage" : "total_usage");
            if (platform != null && usage != null) {
                map.put(platform, usage.intValue());
            }
        }
        return map;
    }

    // ==========================================
    // 新增：邀请转化统计
    // ==========================================

    /**
     * 获取用户邀请转化统计（点击-注册转化率）
     */
    public InviteConversionStatsResponse getInviteConversionStats(Long userId) {
        // 获取用户邀请码
        InviteCodeResponse codeResponse = getOrCreateInviteCode(userId);

        // 获取邀请码实体
        InviteCode myCode = inviteCodeMapper.selectOne(
                new LambdaQueryWrapper<InviteCode>()
                        .eq(InviteCode::getUserId, userId)
                        .eq(InviteCode::getCode, codeResponse.getCode()));

        int clickedCount = myCode != null ? myCode.getClickCount() : 0;

        // 获取所有邀请关系
        List<InviteRelation> relations = inviteRelationMapper.selectList(
                new LambdaQueryWrapper<InviteRelation>()
                        .eq(InviteRelation::getInviterId, userId));

        int totalInvited = relations.size();
        int registeredCount = (int) relations.stream()
                .filter(r -> r.getRegistered() != null && r.getRegistered() == 1)
                .count();
        int pendingCount = totalInvited - registeredCount;

        // 计算转化率
        double conversionRate = 0.0;
        if (clickedCount > 0) {
            conversionRate = Math.round((double) registeredCount / clickedCount * 10000.0) / 100.0;
        }

        // 累计奖励
        int totalReward = relations.stream()
                .mapToInt(InviteRelation::getRewardGranted)
                .sum();

        return InviteConversionStatsResponse.builder()
                .inviteCode(codeResponse.getCode())
                .clickedCount(clickedCount)
                .totalInvited(totalInvited)
                .registeredCount(registeredCount)
                .pendingCount(pendingCount)
                .conversionRate(conversionRate)
                .totalReward(totalReward)
                .build();
    }
}