import { Controller, Post, Get, Body, HttpException, HttpStatus, UseGuards, Logger } from '@nestjs/common'
import { InjectModel } from '@nestjs/mongoose'
import { Model } from 'mongoose'
import { User, UserDocument } from '../user/user.schema'
import { PaymentOrder, PaymentOrderDocument } from '../payment/payment-order.schema'
import { JwtAuthGuard } from '../../common/guards/jwt-auth.guard'
import { CurrentUser } from '../../common/decorators/current-user.decorator'
import { QuotaService } from '../user/quota.service'
import { PricingService } from '../schemas/pricing.service'
import { Public } from '../../common/decorators/public.decorator'

const FREE_DAILY_LIMIT = 2

@Controller('member')
@UseGuards(JwtAuthGuard)
export class MemberController {
  private readonly logger = new Logger(MemberController.name)

  constructor(
    @InjectModel(User.name) private userModel: Model<UserDocument>,
    @InjectModel(PaymentOrder.name) private orderModel: Model<PaymentOrderDocument>,
    private quotaService: QuotaService,
    private pricingService: PricingService,
  ) {}

  @Public()
  @Get('plans')
  async getPlans() {
    const pricing = await this.pricingService.getConfig()
    const plans = [
      {
        id: 'free', name: '免费版', price: 0,
        priceDisplay: '免费',
        dailyLimit: FREE_DAILY_LIMIT,
        features: ['AI 模拟面试 1 次（体验）', '基础面试报告', '通用题库随机出题', '简历优化（限 3 次免费）'],
        credits: { interview: 1, resumeOptimize: 0, resumeDownload: 0 },
      },
    ]

    for (const planId of ['growth', 'sprint'] as const) {
      const cfg = pricing.plans[planId]
      if (cfg) {
        plans.push({
          id: planId,
          name: planId === 'growth' ? '成长版' : '冲刺版',
          price: cfg.price,
          priceDisplay: `¥${(cfg.price / 100).toFixed(1)}/月`,
          dailyLimit: 999,
          features: cfg.features,
          credits: cfg.credits,
        })
      }
    }

    return {
      interview: { dailyFreeLimit: FREE_DAILY_LIMIT, maxRoundsFree: 5, maxRoundsVip: 10 },
      gravityRates: pricing.gravityRates,
      products: {
        interview: { price: pricing.interview.pricePerSession, title: 'AI 模拟面试单次', gravity: pricing.gravityRates.interviewPerUse },
        optimize: { price: pricing.resumeOptimize.pricePerOptimize, title: '简历优化单次', gravity: pricing.gravityRates.optimizePerUse },
        download: { price: pricing.resumeDownload.pricePerDownload, title: '简历下载', gravity: pricing.gravityRates.downloadPerUse },
      },
      plans,
    }
  }

  @Get('status')
  async getStatus(@CurrentUser('userId') userId: string) {
    const user = await this.userModel.findById(userId).exec()
    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
    return {
      plan: user.plan,
      planName: user.plan === 'growth' ? '成长版' : user.plan === 'sprint' ? '冲刺版' : '免费版',
      remaining: user.remaining,
      gravity: user.gravity ?? 0,
      dailyLimit: user.plan !== 'free' ? 999 : FREE_DAILY_LIMIT,
      vipExpireAt: user.vipExpireAt,
      sprintExpireAt: user.sprintExpireAt,
      sprintRemaining: user.sprintRemaining || 0,
      interviewCredits: user.interviewCredits ?? 1,
      resumeOptimizeCredits: user.resumeOptimizeCredits ?? 0,
      resumeDownloadCredits: user.resumeDownloadCredits ?? 0,
      freeOptimizeUsed: user.freeOptimizeUsed ?? 0,
      isVip: user.plan !== 'free',
    }
  }

  /** 凭订单激活套餐（前端 JSAPI 支付成功后兜底调用） */
  @Post('pay')
  async pay(@CurrentUser('userId') userId: string, @Body('outTradeNo') outTradeNo: string) {
    const user = await this.userModel.findById(userId).exec()
    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
    if (user.plan !== 'free') return { success: true, plan: user.plan, message: '已是会员' }

    const order = await this.orderModel.findOne({ outTradeNo, userId }).exec()
    if (!order) throw new HttpException('订单不存在', HttpStatus.NOT_FOUND)
    if (order.status !== 'success') throw new HttpException('支付未完成', HttpStatus.BAD_REQUEST)

    const pricing = await this.pricingService.getConfig()
    const planCfg = pricing.plans[order.plan === 'sprint' ? 'sprint' : 'growth']
    const expireAt = new Date()
    expireAt.setDate(expireAt.getDate() + planCfg.durationDays)
    if (order.plan === 'sprint') {
      user.plan = 'sprint'
      user.sprintExpireAt = expireAt
      user.sprintRemaining = 10
    } else {
      user.plan = 'growth'
      user.vipExpireAt = expireAt
    }
    await this.quotaService.setPlanQuota(userId, planCfg.gravityPerMonth)
    return { success: true, plan: user.plan, planName: user.plan === 'growth' ? '成长版' : '冲刺版', expireAt }
  }

  /** 扣减冲刺版权益次数 */
  @Post('sprint/deduct')
  async deductSprint(@CurrentUser('userId') userId: string) {
    const user = await this.userModel.findById(userId).exec()
    if (!user) throw new HttpException('用户不存在', HttpStatus.NOT_FOUND)
    if (user.plan !== 'sprint') throw new HttpException('非冲刺版会员', HttpStatus.FORBIDDEN)
    if (user.sprintExpireAt && user.sprintExpireAt < new Date()) throw new HttpException('会员已过期', HttpStatus.FORBIDDEN)
    if ((user.sprintRemaining || 0) <= 0) throw new HttpException('剩余次数不足', HttpStatus.FORBIDDEN)
    user.sprintRemaining = (user.sprintRemaining || 0) - 1
    await user.save()
    return { success: true, sprintRemaining: user.sprintRemaining }
  }
}