82 lines
2.3 KiB
Go
82 lines
2.3 KiB
Go
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package service
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import (
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"math/rand"
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"time"
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"nl-game-api-gin/internal/database"
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"nl-game-api-gin/internal/model"
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)
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// VipPeriodStart 计算当前周免周期的起点：最近一个已经到来的周五 12:00（服务器本地时区）
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// 周免批次以该时间戳作随机种子，整周稳定，每周五中午自动轮换
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func VipPeriodStart(now time.Time) time.Time {
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t := time.Date(now.Year(), now.Month(), now.Day(), 12, 0, 0, 0, now.Location())
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for t.Weekday() != time.Friday {
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t = t.AddDate(0, 0, -1)
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}
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// 今天恰好是周五但还没到中午 12 点：仍属于上一周期
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if t.After(now) {
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t = t.AddDate(0, 0, -7)
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}
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return t
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}
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// VipNextRefresh 下一次周免刷新时间（当前周期起点 + 7 天）
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func VipNextRefresh(now time.Time) time.Time {
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return VipPeriodStart(now).AddDate(0, 0, 7)
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}
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// VipWeeklyPool 本周期的周免候选池：全部上架付费游戏按种子洗牌后的固定顺序
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// 各等级按配额取前 N 款，等级越高批次越大（高等级天然包含低等级的周免）
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func VipWeeklyPool(now time.Time) []model.Game {
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var paid []model.Game
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database.DB.Where("status = 1 AND price > 0").Order("id").Find(&paid)
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seed := VipPeriodStart(now).Unix()
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rng := rand.New(rand.NewSource(seed))
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rng.Shuffle(len(paid), func(i, j int) { paid[i], paid[j] = paid[j], paid[i] })
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return paid
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}
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// VipWeeklyBatch 指定等级本周的周免游戏列表（等级≤0 返回空）
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func VipWeeklyBatch(pool []model.Game, levels []model.VipLevel, level int) []model.Game {
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if level <= 0 {
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return nil
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}
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quota := 0
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for _, l := range levels {
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if l.Level == level {
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quota = l.WeeklyFreeQuota
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break
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}
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}
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if quota > len(pool) {
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quota = len(pool)
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}
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return pool[:quota]
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}
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// UserVipLevel 用户当前生效的 VIP 等级（已过期视为 0）
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func UserVipLevel(u *model.User, now time.Time) int {
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if u.VipLevel > 0 && u.VipExpire > now.Unix() {
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return u.VipLevel
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}
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return 0
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}
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// VipWeeklyFreeSet 用户本周可白嫖的付费游戏ID集合（非VIP返回空集合）
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func VipWeeklyFreeSet(u *model.User, now time.Time) map[int]bool {
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set := map[int]bool{}
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level := UserVipLevel(u, now)
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if level <= 0 {
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return set
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}
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var levels []model.VipLevel
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database.DB.Order("level").Find(&levels)
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pool := VipWeeklyPool(now)
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for _, g := range VipWeeklyBatch(pool, levels, level) {
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set[g.ID] = true
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}
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return set
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}
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