package seckill

import (
	"strings"
	"time"

	"douyu_go/internal/logger"
	"douyu_go/internal/types"
	"douyu_go/internal/utils"
)

// runAttempt 标准模式兑换：完整执行鉴权 token→BatchLimit→PreExchange→Exchange 链路。
func (s *Scheduler) runAttempt(attempt types.ExchangeAttempt) types.ExchangeResult {
	cli := s.clientSnapshot()
	// 最终防护：任何旧入口在和平小店活动下都必须使用 livebuy。
	if cli.Activity.IsXiaodian {
		return s.runXiaodianAttempt(attempt)
	}
	result := types.ExchangeResult{
		Account: attempt.Account.Name,
		Product: attempt.Product.CommodityName,
		Attempt: attempt.Index,
	}

	logger.LogAccountEvent("抢购", "info", attempt.Account.Name, "执行资格预检链路: 账号=%s 商品=%s 第%d包", attempt.Account.Name, attempt.Product.CommodityName, attempt.Index)
	var roleName string
	csrf := ""
	if warmup, ok := s.warmupFor(attempt); ok {
		csrf = warmup.CSRF
		roleName = warmup.RoleName
		logger.LogAccountEvent("抢购", "info", attempt.Account.Name, "使用预热鉴权token: 账号=%s 商品=%s 预热距今=%s", attempt.Account.Name, attempt.Product.CommodityName, utils.RoundDuration(time.Since(warmup.CreatedAt)))
	}
	if csrf == "" {
		var err error
		csrf, err = cli.GenerateCSRF(attempt.Account.Cookie)
		if err != nil {
			result.Message = "失败|生成鉴权token失败: " + err.Error()
			return result
		}
		logger.LogAccountEvent("抢购", "info", attempt.Account.Name, "鉴权token已生成，本次兑换链路复用同一个 token: 账号=%s 商品=%s", attempt.Account.Name, attempt.Product.CommodityName)
	}

	limit, err := cli.BatchExchangeLimit(attempt.Account.Cookie, attempt.Product.CommodityID, &csrf)
	if err != nil {
		result.Message = "失败|批量限制检查失败: " + err.Error()
		return result
	}
	if limit <= 0 {
		result.Message = "失败|当前商品限制兑换"
		return result
	}
	logger.LogAccountEvent("抢购", "info", attempt.Account.Name, "批量限制通过: 账号=%s 商品=%s limit=%d", attempt.Account.Name, attempt.Product.CommodityName, limit)

	if err := cli.PreExchange(attempt.Account.Cookie, attempt.Product.CommodityID, &csrf); err != nil {
		result.Message = "失败|预兑换失败: " + err.Error()
		return result
	}
	s.setAttemptCache(attempt.Account.Name, &types.AttemptCache{
		CSRF:      csrf,
		RoleName:  roleName,
		Qualified: true,
		LastCheck: time.Now(),
	})
	logger.LogAccountEvent("抢购", "info", attempt.Account.Name, "资格预检通过: 账号=%s 商品=%s，后续可直兑", attempt.Account.Name, attempt.Product.CommodityName)

	exchangeInfo, err := cli.ExchangeProduct(attempt.Account.Cookie, attempt.Product, &csrf)
	if err != nil {
		s.setAttemptCache(attempt.Account.Name, &types.AttemptCache{
			CSRF:      csrf,
			RoleName:  roleName,
			Qualified: true,
			LastCheck: time.Now(),
		})
		result.RoleName = roleName
		result.Message = "失败|" + err.Error()
		return result
	}

	if roleName == "" {
		roleName, err = cli.RoleName(attempt.Account.Cookie)
		if err != nil {
			logger.LogAccountEvent("抢购", "warn", attempt.Account.Name, "角色名查询失败: 账号=%s err=%v", attempt.Account.Name, err)
		}
	}

	result.OK = true
	result.RoleName = roleName
	if roleName != "" {
		result.Message = "成功|" + roleName + "|" + exchangeInfo
	} else {
		result.Message = "成功|" + exchangeInfo
	}

	// 缓存鉴权 token 和角色名（激进模式使用）
	s.setAttemptCache(attempt.Account.Name, &types.AttemptCache{
		CSRF:      csrf,
		RoleName:  roleName,
		Qualified: true,
		LastCheck: time.Now(),
	})

	return result
}

// runAttemptFast 激进模式的兑换逻辑，复用缓存的鉴权 token，跳过 BatchExchangeLimit 和 PreExchange。
func (s *Scheduler) runAttemptFast(attempt types.ExchangeAttempt) types.ExchangeResult {
	cli := s.clientSnapshot()
	if cli.Activity.IsXiaodian {
		return s.runXiaodianAttempt(attempt)
	}
	result := types.ExchangeResult{
		Account: attempt.Account.Name,
		Product: attempt.Product.CommodityName,
		Attempt: attempt.Index,
	}

	cache := s.getAttemptCache(attempt.Account.Name)
	if cache == nil || cache.CSRF == "" || time.Since(cache.LastCheck) >= qualifiedMaxAge {
		logger.LogAccountEvent("抢购", "info", attempt.Account.Name, "激进模式执行资格预检: 账号=%s 原因=无缓存鉴权token", attempt.Account.Name)
		return s.runAttempt(attempt)
	}
	if !cache.Qualified {
		logger.LogAccountEvent("抢购", "info", attempt.Account.Name, "激进模式执行资格预检: 账号=%s 原因=未完成资格预检", attempt.Account.Name)
		return s.runAttempt(attempt)
	}

	csrf := cache.CSRF
	logger.LogAccountEvent("抢购", "info", attempt.Account.Name, "激进模式直兑: 账号=%s 商品=%s 第%d包", attempt.Account.Name, attempt.Product.CommodityName, attempt.Index)

	// 直接调用 Exchange
	exchangeInfo, err := cli.ExchangeProduct(attempt.Account.Cookie, attempt.Product, &csrf)
	if err != nil {
		s.setAttemptCache(attempt.Account.Name, &types.AttemptCache{
			CSRF:      csrf,
			RoleName:  cache.RoleName,
			Qualified: true,
			LastCheck: time.Now(),
		})
		result.RoleName = cache.RoleName
		errMsg := err.Error()
		if shouldFallbackStandard(errMsg) {
			logger.LogAccountEvent("抢购", "warn", attempt.Account.Name, "激进模式回退标准: 账号=%s 原因=%s", attempt.Account.Name, utils.TrimForLog(errMsg, 80))
			s.setAttemptCache(attempt.Account.Name, nil) // 清空缓存
			return s.runAttempt(attempt)
		}
		result.Message = "失败|" + errMsg
		return result
	}

	// 获取角色名
	roleName := ""
	if cache != nil {
		roleName = cache.RoleName
	}
	if roleName == "" {
		var err error
		roleName, err = cli.RoleName(attempt.Account.Cookie)
		if err != nil {
			logger.LogAccountEvent("抢购", "warn", attempt.Account.Name, "角色名查询失败: 账号=%s err=%v", attempt.Account.Name, err)
		}
	}
	s.setAttemptCache(attempt.Account.Name, &types.AttemptCache{
		CSRF:      csrf,
		RoleName:  roleName,
		Qualified: true,
		LastCheck: time.Now(),
	})

	result.OK = true
	result.RoleName = roleName
	if roleName != "" {
		result.Message = "成功|" + roleName + "|" + exchangeInfo
	} else {
		result.Message = "成功|" + exchangeInfo
	}
	return result
}

// runXiaodianAttempt 和平小店专用兑换：跳过手册鉴权、批量限制和预兑换，直接调用 livebuy。
func (s *Scheduler) runXiaodianAttempt(attempt types.ExchangeAttempt) types.ExchangeResult {
	cli := s.clientSnapshot()
	result := types.ExchangeResult{
		Account: attempt.Account.Name,
		Product: attempt.Product.CommodityName,
		Attempt: attempt.Index,
	}

	if s.runStopped() {
		result.Message = "失败|已收到停止指令"
		return result
	}

	logger.LogAccountEvent("抢购", "info", attempt.Account.Name,
		"和平小店直接兑换: 账号=%s 商品=%s 第%d次",
		attempt.Account.Name, attempt.Product.CommodityName, attempt.Index)
	exchangeInfo, err := cli.ExchangeProduct(attempt.Account.Cookie, attempt.Product, nil)
	if err != nil {
		result.Message = "失败|" + err.Error()
		return result
	}

	roleName, err := cli.RoleName(attempt.Account.Cookie)
	if err != nil {
		logger.LogAccountEvent("抢购", "warn", attempt.Account.Name,
			"角色名查询失败: 账号=%s err=%v", attempt.Account.Name, err)
	}
	result.OK = true
	result.RoleName = roleName
	if roleName != "" {
		result.Message = "成功|" + roleName + "|" + exchangeInfo
	} else {
		result.Message = "成功|" + exchangeInfo
	}
	return result
}

func shouldFallbackStandard(errMsg string) bool {
	lower := strings.ToLower(errMsg)
	switch {
	case strings.Contains(lower, "csrf"):
		return true
	case strings.Contains(lower, "cvl_csrf_token"):
		return true
	case strings.Contains(lower, "preexchange"):
		return true
	case strings.Contains(lower, "limit"):
		return true
	case strings.Contains(errMsg, "预兑换"):
		return true
	case strings.Contains(errMsg, "限制检查"):
		return true
	default:
		return false
	}
}

// ========== 激进模式缓存管理 ==========

func (s *Scheduler) getAttemptCache(accountName string) *types.AttemptCache {
	s.attemptCacheMu.RLock()
	defer s.attemptCacheMu.RUnlock()
	return s.attemptCache[accountName]
}

// initCacheFromWarmup 从预热数据初始化激进模式缓存。
func (s *Scheduler) initCacheFromWarmup(attempts []types.ExchangeAttempt) {
	for _, attempt := range attempts {
		if warmup, ok := s.warmupFor(attempt); ok {
			s.setAttemptCache(attempt.Account.Name, &types.AttemptCache{
				CSRF:      warmup.CSRF,
				RoleName:  warmup.RoleName,
				Qualified: warmup.Qualified,
				LastCheck: time.Now(),
			})
			logger.LogAccountEvent("抢购", "info", attempt.Account.Name, "从预热初始化缓存: 账号=%s", attempt.Account.Name)
		}
	}
}

func (s *Scheduler) setAttemptCache(accountName string, cache *types.AttemptCache) {
	s.attemptCacheMu.Lock()
	defer s.attemptCacheMu.Unlock()
	if cache == nil {
		delete(s.attemptCache, accountName)
		return
	}
	s.attemptCache[accountName] = cache
}

func (s *Scheduler) clearAttemptCache() {
	s.attemptCacheMu.Lock()
	defer s.attemptCacheMu.Unlock()
	s.attemptCache = make(map[string]*types.AttemptCache)
}