package service

import (
	"context"
	"strings"
	"time"

	"affiliate_dash/internal/model"
)

type rockRefreshCacheItem struct {
	response *RockRefreshResponse
	cachedAt time.Time
}

// 腾讯活动链接按生成时间签名。同一提货号过期后重取链接，不另发新号。
const rockBindLinkMaxAge = 8 * time.Minute

type rockBindLinkCacheItem struct {
	bindURL  string
	qrURL    string
	cachedAt time.Time
}

func (s *RockService) rememberBindLink(tokenID uint, bindURL, qrURL string) {
	bindURL = strings.TrimSpace(bindURL)
	if s == nil || tokenID == 0 || bindURL == "" {
		return
	}
	qrURL = strings.TrimSpace(qrURL)
	if qrURL == "" {
		qrURL = qrCodeURL(bindURL)
	}
	s.bindLinkCache.Store(tokenID, rockBindLinkCacheItem{
		bindURL:  bindURL,
		qrURL:    qrURL,
		cachedAt: time.Now(),
	})
}

// freshBindLink 只为仍在扫码的同一提货号重取活动链接。过期前复用缓存，避免每轮轮询都打 0666。
func (s *RockService) freshBindLink(ctx context.Context, tokenID uint, orderNo string) (string, string) {
	if s == nil || s.client == nil || tokenID == 0 {
		return "", ""
	}
	var token model.RockToken
	if err := s.db.WithContext(ctx).First(&token, tokenID).Error; err != nil {
		return "", ""
	}
	if token.Status != model.RockStatusUsing || strings.TrimSpace(token.RedeemCode) == "" {
		return "", ""
	}
	if orderNo = strings.TrimSpace(orderNo); orderNo != "" && token.AssignedOrderNo != "" && token.AssignedOrderNo != orderNo {
		return "", ""
	}
	if item, ok := s.bindLinkCache.Load(token.ID); ok {
		cached := item.(rockBindLinkCacheItem)
		if cached.bindURL != "" && time.Since(cached.cachedAt) < rockBindLinkMaxAge {
			return cached.bindURL, cached.qrURL
		}
	}
	detail, err := s.client.GetRedeemDetail(ctx, token.RedeemCode)
	if err != nil || detail == nil || strings.TrimSpace(detail.BindURL) == "" {
		if item, ok := s.bindLinkCache.Load(token.ID); ok {
			cached := item.(rockBindLinkCacheItem)
			return cached.bindURL, cached.qrURL
		}
		return "", ""
	}
	bindURL := strings.TrimSpace(detail.BindURL)
	qrURL := strings.TrimSpace(detail.QRURL)
	s.rememberBindLink(token.ID, bindURL, qrURL)
	if qrURL == "" {
		qrURL = qrCodeURL(bindURL)
	}
	return bindURL, qrURL
}