import { Injectable, HttpException, HttpStatus, Logger } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository, In } from 'typeorm';
import { Cron, CronExpression } from '@nestjs/schedule';
import axios from 'axios';
import * as crypto from 'crypto';
import { WosUser } from '../entities/wos-user.entity';
import { CouponLog } from '../entities/coupon-log.entity';
import { WosCoupon } from '../entities/wos-coupon.entity';

const SECRET = 'tB87#kPtkxqOS2';
const WOS_API_BASE = 'https://wos-giftcode-api.centurygame.com/api';

const COMMON_HEADERS = {
  'Content-Type': 'application/x-www-form-urlencoded',
  'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36',
  'Origin': 'https://wos-giftcode.centurygame.com',
  'Referer': 'https://wos-giftcode.centurygame.com/',
  'Accept': 'application/json, text/plain, */*',
  'Accept-Language': 'ko-KR,ko;q=0.9,en;q=0.8',
};

const SUCCESS_MSG = '성공';
const ALREADY_MSG = '이미 수령';

@Injectable()
export class WosService {
  private readonly logger = new Logger(WosService.name);

  constructor(
    @InjectRepository(WosUser)
    private wosUserRepo: Repository<WosUser>,
    @InjectRepository(CouponLog)
    private couponLogRepo: Repository<CouponLog>,
    @InjectRepository(WosCoupon)
    private wosCouponRepo: Repository<WosCoupon>,
  ) {}

  private makeSign(fid: string, timestamp: number): string {
    const raw = `fid=${fid}&time=${timestamp}${SECRET}`;
    return crypto.createHash('md5').update(raw).digest('hex');
  }

  async getPlayer(fid: string) {
    const timestamp = Date.now();
    const sign = this.makeSign(fid, timestamp);

    const response = await axios.post(
      `${WOS_API_BASE}/player`,
      new URLSearchParams({ fid, time: String(timestamp), sign }),
      { headers: { ...COMMON_HEADERS } },
    );

    const data = response.data;
    if (data.code !== 0) {
      throw new HttpException(
        data.msg || `오류가 발생했습니다. (${data.err_code})`,
        HttpStatus.BAD_REQUEST,
      );
    }

    const playerInfo = data.data;

    const existing = await this.wosUserRepo.findOne({ where: { fid } });
    if (existing) {
      existing.nickname = playerInfo.nickname;
      existing.avatar_url = playerInfo.avatar_image;
      await this.wosUserRepo.save(existing);
    } else {
      await this.wosUserRepo.save({ fid, nickname: playerInfo.nickname, avatar_url: playerInfo.avatar_image });
    }

    return playerInfo;
  }

  private async acquireSession(fid: string): Promise<string> {
    const timestamp = Date.now();
    const sign = this.makeSign(fid, timestamp);

    const response = await axios.post(
      `${WOS_API_BASE}/captcha`,
      new URLSearchParams({ fid, time: String(timestamp), sign }),
      { headers: { ...COMMON_HEADERS }, withCredentials: true },
    );

    const setCookie = response.headers['set-cookie'];
    let sessionValue = '';
    if (setCookie) {
      const found = setCookie.find((c: string) => c.toLowerCase().includes('session'));
      if (found) sessionValue = found.split(';')[0];
    }
    return sessionValue;
  }

  private async redeemOne(
    fid: string,
    code: string,
    session: string,
  ): Promise<{ success: boolean; message: string; err_code?: number }> {
    const timestamp = Date.now();
    const sign = this.makeSign(fid, timestamp);

    const response = await axios.post(
      `${WOS_API_BASE}/gift_code`,
      new URLSearchParams({ fid, time: String(timestamp), sign, cdk: code, validate: '1' }),
      { headers: { ...COMMON_HEADERS, Cookie: session } },
    );

    const data = response.data;
    if (data.code === 0) return { success: true, message: SUCCESS_MSG };
    return { success: false, message: data.msg || `실패 (${data.err_code})`, err_code: data.err_code };
  }

  async redeemAll(fid: string) {
    const activeCoupons = await this.wosCouponRepo.find({
      where: { is_active: true, is_expired: false },
    });
    if (activeCoupons.length === 0) return [];

    const existingLogs = await this.couponLogRepo.find({
      where: { fid, result_msg: In([SUCCESS_MSG, ALREADY_MSG]) },
    });
    const alreadySucceeded = new Set(existingLogs.map((l) => l.coupon_code));

    const results: { name: string; code: string; status: string; message: string }[] = [];
    let session = await this.acquireSession(fid);

    for (const coupon of activeCoupons) {
      if (alreadySucceeded.has(coupon.code)) {
        results.push({ name: coupon.name, code: coupon.code, status: 'skipped', message: '이미 지급 완료' });
        continue;
      }

      let result: { success: boolean; message: string; err_code?: number };
      try {
        result = await this.redeemOne(fid, coupon.code, session);

        if (result.err_code === 40014 || result.err_code === 40004) {
          session = await this.acquireSession(fid);
          await new Promise((r) => setTimeout(r, 500));
          result = await this.redeemOne(fid, coupon.code, session);
        }
      } catch (err: any) {
        result = { success: false, message: err.message || '오류 발생' };
      }

      if (result.err_code === 40008) {
        result = { success: true, message: ALREADY_MSG, err_code: 40008 };
      }

      if (result.err_code === 40007) {
        await this.wosCouponRepo.update(coupon.id, { is_expired: true, is_active: false });
        result.message = '만료된 쿠폰';
      }

      const status = result.success ? 'success' : 'error';
      await this.couponLogRepo.save({ fid, coupon_code: coupon.code, result_msg: result.message });
      results.push({ name: coupon.name, code: coupon.code, status, message: result.message });

      await new Promise((r) => setTimeout(r, 1000));
    }

    return results;
  }

  @Cron('0 0 9 * * *')
  async scheduledRedeemAll() {
    this.logger.log('자동 쿠폰 지급 시작...');
    const users = await this.wosUserRepo.find();
    for (const user of users) {
      try {
        await this.redeemAll(user.fid);
        this.logger.log(`[${user.fid}] ${user.nickname} 지급 완료`);
      } catch (err: any) {
        this.logger.error(`[${user.fid}] 지급 실패: ${err.message}`);
      }
      await new Promise((r) => setTimeout(r, 2000));
    }
    this.logger.log('자동 쿠폰 지급 완료');
  }

  async getHistory(fid: string) {
    return this.couponLogRepo.find({
      where: { fid },
      order: { executed_at: 'DESC' },
      take: 100,
    });
  }

  async listUsers() {
    return this.wosUserRepo.find({ order: { created_at: 'DESC' } });
  }

  async listCoupons() {
    return this.wosCouponRepo.find({ order: { created_at: 'DESC' } });
  }

  async addCoupon(name: string, code: string) {
    const exists = await this.wosCouponRepo.findOne({ where: { code } });
    if (exists) {
      exists.name = name;
      exists.is_active = true;
      exists.is_expired = false;
      return this.wosCouponRepo.save(exists);
    }
    return this.wosCouponRepo.save({ name, code, is_active: true, is_expired: false });
  }

  async toggleCoupon(id: number, is_active: boolean) {
    await this.wosCouponRepo.update(id, { is_active });
    return this.wosCouponRepo.findOne({ where: { id } });
  }

  async deleteCoupon(id: number) {
    await this.wosCouponRepo.delete(id);
    return { success: true };
  }
}