320 lines
9.1 KiB
Go
320 lines
9.1 KiB
Go
package usecase
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import (
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"context"
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"fmt"
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"strings"
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"time"
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"apps/backend/internal/module/usage/domain"
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"github.com/google/uuid"
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)
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// KeyResolver decides platform vs byok for a meter.
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type KeyResolver interface {
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// Resolve returns key_mode and whether a usable key exists.
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Resolve(ctx context.Context, uid int64, meter string) (keyMode string, hasKey bool, err error)
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}
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// StaticResolver for tests / simple wiring.
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type StaticResolver struct {
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// ByUIDMeter: "uid:meter" -> keyMode (platform|byok); empty means no key
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Map map[string]string
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}
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func (s *StaticResolver) Resolve(_ context.Context, uid int64, meter string) (string, bool, error) {
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if s == nil || s.Map == nil {
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return "", false, nil
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}
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k := s.Map[fmt.Sprintf("%d:%s", uid, meter)]
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if k == "" {
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return "", false, nil
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}
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return k, true, nil
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}
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type Service struct {
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Repo domain.Repository
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Resolver KeyResolver
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// Platform capacity / rate limit. nil = always allow platform.
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// When denied, only BYOK (already preferred in Resolver) can proceed.
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Gate PlatformGate
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}
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func New(repo domain.Repository, resolver KeyResolver) *Service {
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return &Service{Repo: repo, Resolver: resolver}
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}
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// RecordCall after successful external call (or for meter tests).
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func (s *Service) RecordCall(ctx context.Context, uid int64, meter, keyMode, label, source string) (*domain.Event, error) {
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if keyMode != domain.KeyModePlatform && keyMode != domain.KeyModeByok {
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return nil, fmt.Errorf("invalid key_mode")
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}
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credits := 0
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if keyMode == domain.KeyModePlatform {
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credits = domain.MeterCost(meter)
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if err := s.checkPlatformQuota(ctx, uid, meter, credits); err != nil {
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return nil, err
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}
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}
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now := domain.NowNano()
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e := &domain.Event{
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ID: uuid.NewString(), UID: uid, Meter: meter, Credits: credits,
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KeyMode: keyMode, Label: label, Source: source,
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MonthKey: domain.MonthKey(now), CreatedAt: now,
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}
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if err := s.Repo.InsertEvent(ctx, e); err != nil {
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return nil, err
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}
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return e, nil
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}
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// PrepareCall checks quota / key before external call; returns key_mode.
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// Platform path: capacity gate first, then plan credits. BYOK skips both.
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func (s *Service) PrepareCall(ctx context.Context, uid int64, meter string) (keyMode string, err error) {
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if s.Resolver == nil {
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return "", domain.ErrNoKey
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}
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mode, has, err := s.Resolver.Resolve(ctx, uid, meter)
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if err != nil {
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return "", err
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}
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if !has {
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return "", domain.ErrNoKey
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}
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if mode == domain.KeyModePlatform {
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if s.Gate != nil && !s.Gate.AllowPlatform(meter) {
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return "", domain.ErrPlatformCapacity
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}
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cost := domain.MeterCost(meter)
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if err := s.checkPlatformQuota(ctx, uid, meter, cost); err != nil {
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return "", err
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}
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}
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return mode, nil
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}
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// MarkPlatformLimited cools down platform keys (e.g. after upstream 429).
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// BYOK users are unaffected. until zero clears the cool-down.
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func (s *Service) MarkPlatformLimited(until time.Time) {
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if s == nil || s.Gate == nil {
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return
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}
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s.Gate.MarkLimited(until)
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}
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// checkPlatformQuota — 總池 + 分項點數上限；unlimited 略過。
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func (s *Service) checkPlatformQuota(ctx context.Context, uid int64, meter string, cost int) error {
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if cost < 0 {
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cost = 0
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}
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prefs, _ := s.ensurePrefs(ctx, uid)
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if prefs.Unlimited {
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return nil
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}
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sum, err := s.GetSummary(ctx, uid, domain.CurrentMonthKey())
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if err != nil {
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return err
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}
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// 1) 整月 platform 總點
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if sum.Platform.CreditsRemaining < cost {
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return domain.ErrQuotaExceeded
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}
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// 2) 分項點數硬上限（platform only；加總 = MonthlyCredits）
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plan := domain.ResolvePlan(prefs.PlanID)
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if capN, ok := plan.SoftCaps[meter]; ok && capN > 0 {
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usedCredits := 0
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usedCount := 0
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if m, ok := sum.Platform.ByMeter[meter]; ok {
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usedCredits = m.Credits
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usedCount = m.Count
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// 舊資料若 credits 漏記，用次數 × 單價估
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if usedCredits < usedCount*domain.MeterCost(meter) {
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usedCredits = usedCount * domain.MeterCost(meter)
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}
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}
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if usedCredits+cost > capN {
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return domain.ErrMeterCapExceeded
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}
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}
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return nil
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}
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func (s *Service) ensurePrefs(ctx context.Context, uid int64) (*domain.MemberPrefs, error) {
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p, err := s.Repo.GetPrefs(ctx, uid)
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if err != nil || p == nil {
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p = &domain.MemberPrefs{UID: uid, PlanID: domain.PlanFree, UpdatedAt: domain.NowNano()}
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_ = s.Repo.SavePrefs(ctx, p)
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}
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// 正規化 plan_id（小寫／有效方案）
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norm := domain.ResolvePlan(p.PlanID).ID
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if p.PlanID != norm {
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p.PlanID = norm
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p.UpdatedAt = domain.NowNano()
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_ = s.Repo.SavePrefs(ctx, p)
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}
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return p, nil
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}
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func (s *Service) GetSummary(ctx context.Context, uid int64, monthKey string) (*domain.MonthSummary, error) {
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if monthKey == "" {
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monthKey = domain.CurrentMonthKey()
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}
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prefs, _ := s.ensurePrefs(ctx, uid)
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plan := domain.ResolvePlan(prefs.PlanID)
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// 回寫正規化 plan_id，避免 DB 殘留大小寫／空白導致永遠 fallback Free
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if prefs.PlanID != plan.ID {
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prefs.PlanID = plan.ID
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prefs.UpdatedAt = domain.NowNano()
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_ = s.Repo.SavePrefs(ctx, prefs)
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}
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events, err := s.Repo.ListEvents(ctx, uid, monthKey, "all", 0)
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if err != nil {
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return nil, err
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}
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platBy := map[string]domain.MeterCount{}
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byokBy := map[string]domain.MeterCount{}
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platUsed, platCalls, byokCalls := 0, 0, 0
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for _, e := range events {
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if e.KeyMode == domain.KeyModePlatform {
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platUsed += e.Credits
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platCalls++
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m := platBy[e.Meter]
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m.Count++
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m.Credits += e.Credits
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platBy[e.Meter] = m
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} else if e.KeyMode == domain.KeyModeByok {
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byokCalls++
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m := byokBy[e.Meter]
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m.Count++
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byokBy[e.Meter] = m
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}
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}
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remaining := plan.MonthlyCredits - platUsed
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if remaining < 0 {
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remaining = 0
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}
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// Unlimited 只影響是否擋用，顯示仍報真實已用／剩餘（前端以 unlimited 旗標顯示 ∞）
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return &domain.MonthSummary{
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MonthKey: monthKey, UID: uid, PlanID: plan.ID, Unlimited: prefs.Unlimited,
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Platform: domain.PlatformBlock{
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CreditsUsed: platUsed, CreditsRemaining: remaining, CreditsTotal: plan.MonthlyCredits,
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CallCount: platCalls, ByMeter: platBy,
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},
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Byok: domain.ByokBlock{CallCount: byokCalls, ByMeter: byokBy},
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// TotalCredits = 方案配給（legacy 欄位名）；已用請看 platform.credits_used
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TotalCredits: plan.MonthlyCredits, RemainingCredits: remaining,
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}, nil
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}
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func (s *Service) ListEvents(ctx context.Context, uid int64, monthKey, keyMode string, limit int) ([]*domain.Event, error) {
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if limit <= 0 {
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limit = 100
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}
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return s.Repo.ListEvents(ctx, uid, monthKey, keyMode, limit)
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}
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func (s *Service) GetPrefs(ctx context.Context, uid int64) (*domain.MemberPrefs, error) {
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return s.ensurePrefs(ctx, uid)
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}
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func (s *Service) SetPrefs(ctx context.Context, actorUID int64, targetUID int64, isAdmin bool, planID string, unlimited *bool) (*domain.MemberPrefs, error) {
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if !isAdmin && actorUID != targetUID {
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return nil, domain.ErrForbidden
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}
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if !isAdmin && unlimited != nil {
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// members cannot set unlimited
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return nil, domain.ErrForbidden
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}
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p, _ := s.ensurePrefs(ctx, targetUID)
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if planID != "" {
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id := strings.ToLower(strings.TrimSpace(planID))
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if _, ok := domain.Plans[id]; !ok {
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return nil, domain.ErrInvalidPlan
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}
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// member self can only change via purchase
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if !isAdmin && actorUID == targetUID {
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return nil, domain.ErrForbidden
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}
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p.PlanID = id
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}
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if unlimited != nil && isAdmin {
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p.Unlimited = *unlimited
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}
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p.UpdatedAt = domain.NowNano()
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if err := s.Repo.SavePrefs(ctx, p); err != nil {
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return nil, err
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}
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return p, nil
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}
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func (s *Service) PurchasePlan(ctx context.Context, uid int64, planID, mockRef string) (*domain.Purchase, error) {
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id := strings.ToLower(strings.TrimSpace(planID))
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plan, ok := domain.Plans[id]
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if !ok || plan.ID == "" {
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return nil, domain.ErrInvalidPlan
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}
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p, _ := s.ensurePrefs(ctx, uid)
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p.PlanID = plan.ID
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p.UpdatedAt = domain.NowNano()
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if err := s.Repo.SavePrefs(ctx, p); err != nil {
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return nil, err
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}
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pur := &domain.Purchase{
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ID: uuid.NewString(), UID: uid, PlanID: plan.ID, MockRef: mockRef, CreatedAt: domain.NowNano(),
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}
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if err := s.Repo.InsertPurchase(ctx, pur); err != nil {
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return nil, err
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}
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return pur, nil
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}
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func (s *Service) ListMyPurchases(ctx context.Context, uid int64, limit int) ([]*domain.Purchase, error) {
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if limit <= 0 {
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limit = 50
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}
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return s.Repo.ListPurchases(ctx, uid, limit)
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}
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func (s *Service) TenantSummary(ctx context.Context, monthKey string) (*domain.TenantSummary, error) {
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if monthKey == "" {
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monthKey = domain.CurrentMonthKey()
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}
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events, err := s.Repo.ListEventsAll(ctx, monthKey, 0)
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if err != nil {
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return nil, err
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}
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type acc struct {
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plat int
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byok int
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}
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byUID := map[int64]*acc{}
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platTotal, byokTotal := 0, 0
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for _, e := range events {
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a := byUID[e.UID]
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if a == nil {
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a = &acc{}
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byUID[e.UID] = a
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}
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if e.KeyMode == domain.KeyModePlatform {
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a.plat += e.Credits
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platTotal += e.Credits
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} else if e.KeyMode == domain.KeyModeByok {
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a.byok++
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byokTotal++
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}
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}
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var members []domain.TenantRow
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for uid, a := range byUID {
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prefs, _ := s.ensurePrefs(ctx, uid)
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members = append(members, domain.TenantRow{
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UID: uid, PlanID: prefs.PlanID, Unlimited: prefs.Unlimited,
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PlatformCreditsUsed: a.plat, ByokCallCount: a.byok,
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})
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}
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return &domain.TenantSummary{
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MonthKey: monthKey, PlatformCreditsUsed: platTotal, ByokCallCount: byokTotal, Members: members,
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}, nil
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}
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