//go:build unit

package service

import (
	"context"
	"errors"
	"strings"
	"testing"
	"time"

	"github.com/Wei-Shaw/sub2api/internal/config"
	"github.com/Wei-Shaw/sub2api/internal/pkg/ctxkey"
	"github.com/stretchr/testify/require"
)

func newGatewayRecordUsageServiceForTest(usageRepo UsageLogRepository, userRepo UserRepository, subRepo UserSubscriptionRepository) *GatewayService {
	cfg := &config.Config{}
	cfg.Default.RateMultiplier = 1.1
	return NewGatewayService(
		nil,
		nil,
		usageRepo,
		nil,
		userRepo,
		subRepo,
		nil,
		nil,
		cfg,
		nil,
		nil,
		NewBillingService(cfg, nil),
		nil,
		&BillingCacheService{},
		nil,
		nil,
		&DeferredService{},
		nil,
		nil,
		nil,
		nil,
		nil,
		nil,
		nil,
		nil,
		nil,
		nil,
		nil, // userPlatformQuotaRepo
	)
}

func newGatewayRecordUsageServiceWithBillingRepoForTest(usageRepo UsageLogRepository, billingRepo UsageBillingRepository, userRepo UserRepository, subRepo UserSubscriptionRepository) *GatewayService {
	svc := newGatewayRecordUsageServiceForTest(usageRepo, userRepo, subRepo)
	svc.usageBillingRepo = billingRepo
	return svc
}

type openAIRecordUsageBestEffortLogRepoStub struct {
	UsageLogRepository

	bestEffortErr   error
	createErr       error
	bestEffortCalls int
	createCalls     int
	lastLog         *UsageLog
	lastCtxErr      error
}

func (s *openAIRecordUsageBestEffortLogRepoStub) CreateBestEffort(ctx context.Context, log *UsageLog) error {
	s.bestEffortCalls++
	s.lastLog = log
	s.lastCtxErr = ctx.Err()
	return s.bestEffortErr
}

func (s *openAIRecordUsageBestEffortLogRepoStub) Create(ctx context.Context, log *UsageLog) (bool, error) {
	s.createCalls++
	s.lastLog = log
	s.lastCtxErr = ctx.Err()
	return false, s.createErr
}

func TestGatewayServiceRecordUsage_BillingUsesDetachedContext(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{inserted: false, err: context.DeadlineExceeded}
	userRepo := &openAIRecordUsageUserRepoStub{}
	subRepo := &openAIRecordUsageSubRepoStub{}
	quotaSvc := &openAIRecordUsageAPIKeyQuotaStub{}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, userRepo, subRepo)

	reqCtx, cancel := context.WithCancel(context.Background())
	cancel()

	err := svc.RecordUsage(reqCtx, &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "gateway_detached_ctx",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 6,
			},
			Model:    "claude-sonnet-4",
			Duration: time.Second,
		},
		APIKey: &APIKey{
			ID:    501,
			Quota: 100,
		},
		User:          &User{ID: 601},
		Account:       &Account{ID: 701},
		APIKeyService: quotaSvc,
	})

	require.NoError(t, err)
	require.Equal(t, 1, usageRepo.calls)
	require.Equal(t, 1, userRepo.deductCalls)
	require.NoError(t, userRepo.lastCtxErr)
	require.Equal(t, 1, quotaSvc.quotaCalls)
	require.NoError(t, quotaSvc.lastQuotaCtxErr)
}

func TestGatewayServiceRecordUsage_BillingFingerprintIncludesRequestPayloadHash(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{}
	billingRepo := &openAIRecordUsageBillingRepoStub{result: &UsageBillingApplyResult{Applied: true}}
	svc := newGatewayRecordUsageServiceWithBillingRepoForTest(usageRepo, billingRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})

	payloadHash := HashUsageRequestPayload([]byte(`{"messages":[{"role":"user","content":"hello"}]}`))
	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "gateway_payload_hash",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 6,
			},
			Model:    "claude-sonnet-4",
			Duration: time.Second,
		},
		APIKey:             &APIKey{ID: 501, Quota: 100},
		User:               &User{ID: 601},
		Account:            &Account{ID: 701},
		RequestPayloadHash: payloadHash,
	})
	require.NoError(t, err)
	require.NotNil(t, billingRepo.lastCmd)
	require.Equal(t, payloadHash, billingRepo.lastCmd.RequestPayloadHash)
}

func TestGatewayServiceRecordUsage_BillingFingerprintFallsBackToContextRequestID(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{}
	billingRepo := &openAIRecordUsageBillingRepoStub{result: &UsageBillingApplyResult{Applied: true}}
	svc := newGatewayRecordUsageServiceWithBillingRepoForTest(usageRepo, billingRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})

	ctx := context.WithValue(context.Background(), ctxkey.RequestID, "req-local-123")
	err := svc.RecordUsage(ctx, &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "gateway_payload_fallback",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 6,
			},
			Model:    "claude-sonnet-4",
			Duration: time.Second,
		},
		APIKey:  &APIKey{ID: 501, Quota: 100},
		User:    &User{ID: 601},
		Account: &Account{ID: 701},
	})
	require.NoError(t, err)
	require.NotNil(t, billingRepo.lastCmd)
	require.Equal(t, "local:req-local-123", billingRepo.lastCmd.RequestPayloadHash)
}

func TestGatewayServiceRecordUsage_PreservesRequestedAndUpstreamModels(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})
	mappedModel := "claude-sonnet-4-20250514"

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID:     "gateway_models_split",
			Usage:         ClaudeUsage{InputTokens: 10, OutputTokens: 6},
			Model:         "claude-sonnet-4",
			UpstreamModel: mappedModel,
			Duration:      time.Second,
		},
		APIKey:  &APIKey{ID: 501, Quota: 100},
		User:    &User{ID: 601},
		Account: &Account{ID: 701},
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	require.Equal(t, "claude-sonnet-4", usageRepo.lastLog.Model)
	require.Equal(t, "claude-sonnet-4", usageRepo.lastLog.RequestedModel)
	require.NotNil(t, usageRepo.lastLog.UpstreamModel)
	require.Equal(t, mappedModel, *usageRepo.lastLog.UpstreamModel)
}

func TestGatewayServiceRecordUsage_GeminiFlashThinkingTierUsesCatalogPrice(t *testing.T) {
	for _, baseModel := range []string{"gemini-3.7-flash", "gemini-3.8-flash"} {
		t.Run(baseModel, func(t *testing.T) {
			usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
			userRepo := &openAIRecordUsageUserRepoStub{}
			svc := newGatewayRecordUsageServiceForTest(usageRepo, userRepo, &openAIRecordUsageSubRepoStub{})
			svc.billingService = NewBillingService(svc.cfg, &PricingService{pricingData: map[string]*LiteLLMModelPricing{
				baseModel: {InputCostPerToken: 0.75e-6, OutputCostPerToken: 3.75e-6, CacheReadInputTokenCost: 0.075e-6},
			}})
			svc.resolver = NewModelPricingResolver(nil, svc.billingService)
			group := &Group{ID: 27, Platform: PlatformGemini, RateMultiplier: 0.15}
			model := baseModel + "-medium"

			err := svc.RecordUsage(context.Background(), &RecordUsageInput{
				Result: &ForwardResult{
					RequestID:     "gemini_thinking_tier",
					Model:         model,
					UpstreamModel: model,
					Usage:         ClaudeUsage{InputTokens: 8498, OutputTokens: 469, CacheReadInputTokens: 159248},
					Duration:      time.Second,
				},
				APIKey:  &APIKey{ID: 501, GroupID: &group.ID, Group: group},
				User:    &User{ID: 601},
				Account: &Account{ID: 701, Platform: PlatformGemini, Type: AccountTypeAPIKey},
			})

			require.NoError(t, err)
			require.NotNil(t, usageRepo.lastLog)
			require.Equal(t, model, usageRepo.lastLog.Model)
			require.InDelta(t, 0.02007585, usageRepo.lastLog.TotalCost, 1e-12)
			require.InDelta(t, 0.0030113775, usageRepo.lastLog.ActualCost, 1e-12)
			require.InDelta(t, 0.0030113775, userRepo.lastAmount, 1e-12)
		})
	}
}

func TestGatewayServiceRecordUsage_PreservesChannelMappedUpstreamModel(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID:     "gateway_channel_mapping_models",
			Usage:         ClaudeUsage{InputTokens: 10, OutputTokens: 6},
			Model:         "gpt-5.6-terra",
			UpstreamModel: "gpt-5.6-terra",
			Duration:      time.Second,
		},
		APIKey:  &APIKey{ID: 501, Quota: 100},
		User:    &User{ID: 601},
		Account: &Account{ID: 701},
		ChannelUsageFields: ChannelUsageFields{
			OriginalModel:      "gpt-5.6-sol",
			ChannelMappedModel: "gpt-5.6-terra",
		},
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	require.Equal(t, "gpt-5.6-sol", usageRepo.lastLog.RequestedModel)
	require.Equal(t, "gpt-5.6-terra", usageRepo.lastLog.Model)
	require.NotNil(t, usageRepo.lastLog.UpstreamModel)
	require.Equal(t, "gpt-5.6-terra", *usageRepo.lastLog.UpstreamModel)
}

func TestGatewayServiceRecordUsage_PreservesLoopedChannelAndAccountUpstreamModel(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID:     "gateway_looped_mapping_models",
			Usage:         ClaudeUsage{InputTokens: 10, OutputTokens: 6},
			Model:         "gpt-5.6-terra",
			UpstreamModel: "gpt-5.6-sol",
			Duration:      time.Second,
		},
		APIKey:  &APIKey{ID: 501, Quota: 100},
		User:    &User{ID: 601},
		Account: &Account{ID: 701},
		ChannelUsageFields: ChannelUsageFields{
			OriginalModel:      "gpt-5.6-sol",
			ChannelMappedModel: "gpt-5.6-terra",
		},
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	require.Equal(t, "gpt-5.6-sol", usageRepo.lastLog.RequestedModel)
	require.Equal(t, "gpt-5.6-terra", usageRepo.lastLog.Model)
	require.NotNil(t, usageRepo.lastLog.UpstreamModel)
	require.Equal(t, "gpt-5.6-sol", *usageRepo.lastLog.UpstreamModel)
}

func TestGatewayServiceRecordUsage_EmptyImageSizeDefaultsBeforeBillingAndPersistence(t *testing.T) {
	imagePrice2K := 0.19
	groupID := int64(901)
	usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID:      "gateway_image_default_size",
			Model:          "gemini-image",
			ImageCount:     1,
			ImageInputSize: "auto",
			Duration:       time.Second,
		},
		APIKey: &APIKey{
			ID:      801,
			GroupID: i64p(groupID),
			Group: &Group{
				ID:             groupID,
				RateMultiplier: 1.0,
				ImagePrice2K:   &imagePrice2K,
			},
		},
		User:    &User{ID: 601},
		Account: &Account{ID: 701},
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	require.Equal(t, 1, usageRepo.lastLog.ImageCount)
	require.NotNil(t, usageRepo.lastLog.ImageSize)
	require.Equal(t, ImageBillingSize2K, *usageRepo.lastLog.ImageSize)
	require.NotNil(t, usageRepo.lastLog.ImageInputSize)
	require.Equal(t, "auto", *usageRepo.lastLog.ImageInputSize)
	require.NotNil(t, usageRepo.lastLog.ImageSizeSource)
	require.Equal(t, ImageSizeSourceDefault, *usageRepo.lastLog.ImageSizeSource)
	require.InDelta(t, 0.19, usageRepo.lastLog.TotalCost, 1e-12)
	require.InDelta(t, 0.19, usageRepo.lastLog.ActualCost, 1e-12)
}

func TestGatewayServiceRecordUsage_PeakRateAffectsTokenModeImageOutputTokens(t *testing.T) {
	groupID := int64(902)
	usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
	userRepo := &openAIRecordUsageUserRepoStub{}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, userRepo, &openAIRecordUsageSubRepoStub{})
	svc.resolver = newOpenAITokenImageChannelPricingResolverForTest(t, groupID, "gemini-image")

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID:  "gateway_peak_image_tokens",
			Model:      "gemini-image",
			ImageCount: 1,
			Usage: ClaudeUsage{
				InputTokens:       1000,
				OutputTokens:      600,
				ImageOutputTokens: 100,
			},
			Duration: time.Second,
		},
		APIKey: &APIKey{
			ID:      802,
			GroupID: i64p(groupID),
			Group: &Group{
				ID:                 groupID,
				RateMultiplier:     1.0,
				SubscriptionType:   SubscriptionTypeSubscription,
				PeakRateEnabled:    true,
				PeakStart:          "00:00",
				PeakEnd:            "23:59",
				PeakRateMultiplier: 3.0,
			},
		},
		User:    &User{ID: 602},
		Account: &Account{ID: 702},
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	require.NotNil(t, usageRepo.lastLog.BillingMode)
	require.Equal(t, string(BillingModeToken), *usageRepo.lastLog.BillingMode)
	require.Equal(t, 3.0, usageRepo.lastLog.RateMultiplier)

	textInput := 1000 * 3e-6
	textOutput := 500 * 15e-6
	imageOutput := 100 * 15e-6
	expectedActual := (textInput + textOutput + imageOutput) * 3.0

	require.InDelta(t, textInput+textOutput+imageOutput, usageRepo.lastLog.TotalCost, 1e-12)
	require.InDelta(t, imageOutput, usageRepo.lastLog.ImageOutputCost, 1e-12)
	require.InDelta(t, expectedActual, usageRepo.lastLog.ActualCost, 1e-12)
	require.InDelta(t, expectedActual, userRepo.lastAmount, 1e-12)
}

func TestGatewayServiceRecordUsage_TimePricingUsesPricingAt(t *testing.T) {
	groupID := int64(904)
	requestStart := time.Date(2024, time.January, 2, 2, 0, 0, 0, time.UTC) // 上海 10:00
	usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
	userRepo := &openAIRecordUsageUserRepoStub{}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, userRepo, &openAIRecordUsageSubRepoStub{})
	svc.resolver = newOpenAITokenImageChannelPricingResolverWithTimeForTest(t, groupID, "gpt-5.1", &ChannelTimePricing{
		Timezone: "Asia/Shanghai",
		Periods:  []ChannelTimePricingPeriod{{StartTime: "09:00", EndTime: "12:00", Multiplier: 2}},
	})

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "gateway_time_pricing_request_start",
			Model:     "gpt-5.1",
			Usage:     ClaudeUsage{InputTokens: 1000, OutputTokens: 500},
		},
		APIKey: &APIKey{ID: 804, GroupID: i64p(groupID), Group: &Group{
			ID: groupID, RateMultiplier: 0.8, SubscriptionType: SubscriptionTypeSubscription,
		}},
		User:      &User{ID: 604},
		Account:   &Account{ID: 704},
		PricingAt: requestStart,
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	baseCost := 1000*3e-6 + 500*15e-6
	require.InDelta(t, baseCost*2, usageRepo.lastLog.TotalCost, 1e-12)
	require.InDelta(t, baseCost*2*0.8, usageRepo.lastLog.ActualCost, 1e-12)
	require.InDelta(t, 0.8, usageRepo.lastLog.RateMultiplier, 1e-12)
}
func TestGatewayServiceRecordUsage_UsesExplicitPricingAtForPeakRate(t *testing.T) {
	for _, platform := range []string{PlatformAnthropic, PlatformGemini, PlatformGrok, PlatformAntigravity} {
		t.Run(platform, func(t *testing.T) {
			groupID := int64(903)
			usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
			userRepo := &openAIRecordUsageUserRepoStub{}
			svc := newGatewayRecordUsageServiceForTest(usageRepo, userRepo, &openAIRecordUsageSubRepoStub{})
			svc.resolver = newOpenAITokenImageChannelPricingResolverForTest(t, groupID, "gemini-image")

			pricingAt := time.Date(2026, time.January, 1, 0, 30, 0, 0, time.UTC)
			err := svc.RecordUsage(context.Background(), &RecordUsageInput{
				Result: &ForwardResult{
					RequestID:  "gateway_explicit_pricing_at_" + platform,
					Model:      "gemini-image",
					ImageCount: 1,
					Usage: ClaudeUsage{
						InputTokens:       1000,
						OutputTokens:      600,
						ImageOutputTokens: 100,
					},
				},
				APIKey: &APIKey{
					ID:      803,
					GroupID: i64p(groupID),
					Group: &Group{
						ID:                 groupID,
						Platform:           platform,
						RateMultiplier:     1.0,
						SubscriptionType:   SubscriptionTypeSubscription,
						PeakRateEnabled:    true,
						PeakStart:          "00:00",
						PeakEnd:            "01:00",
						PeakRateMultiplier: 3.0,
					},
				},
				User:      &User{ID: 603},
				Account:   &Account{ID: 703, Platform: platform},
				PricingAt: pricingAt,
			})

			require.NoError(t, err)
			require.NotNil(t, usageRepo.lastLog)
			require.Equal(t, 3.0, usageRepo.lastLog.RateMultiplier)
		})
	}
}

func TestGatewayServiceRecordUsage_DeepSeekAccountStatsUsesRequestPricingAtAndUpstreamModel(t *testing.T) {
	for _, model := range []struct {
		name        string
		offPeakCost float64
	}{
		{"deepseek-v4-flash", 1000*2.2e-7 + 500*6.6e-7 + 1000*7e-9},
		{"deepseek-v4-pro", 1000*6.6e-7 + 500*1.98e-6 + 1000*2.2e-8},
	} {
		for _, slot := range []struct {
			name       string
			pricingAt  time.Time
			multiplier float64
		}{
			{"peak", time.Date(2026, time.August, 24, 2, 0, 0, 0, time.UTC), 2},
			{"off_peak", time.Date(2026, time.August, 24, 12, 0, 0, 0, time.UTC), 1},
		} {
			t.Run(model.name+"/"+slot.name, func(t *testing.T) {
				usageRepo := &openAIRecordUsageLogRepoStub{inserted: true}
				userRepo := &openAIRecordUsageUserRepoStub{}
				svc := newGatewayRecordUsageServiceForTest(usageRepo, userRepo, &openAIRecordUsageSubRepoStub{})
				groupID := int64(905)
				svc.channelService = newTestChannelServiceForStats(t, &Channel{ID: 1, Status: StatusActive}, groupID, PlatformDeepseek)
				svc.resolver = NewModelPricingResolver(svc.channelService, svc.billingService)
				alias := "customer-chat"
				inputPrice, outputPrice, cachePrice := 1e-6, 2e-6, 1e-7
				group := &Group{ID: groupID, Platform: PlatformDeepseek, RateMultiplier: 0.8,
					ModelPricing: []ChannelModelPricing{{
						Models: []string{alias}, BillingMode: BillingModeToken,
						InputPrice: &inputPrice, OutputPrice: &outputPrice, CacheReadPrice: &cachePrice,
					}},
				}
				err := svc.RecordUsage(context.Background(), &RecordUsageInput{
					Result: &ForwardResult{
						RequestID: "gateway_deepseek_account_stats_" + model.name + "_" + slot.name,
						Model:     alias, UpstreamModel: model.name,
						Usage: ClaudeUsage{InputTokens: 1000, OutputTokens: 500, CacheReadInputTokens: 1000},
					},
					APIKey: &APIKey{ID: 805, GroupID: &groupID, Group: group},
					User:   &User{ID: 605}, Account: &Account{ID: 705, Platform: PlatformDeepseek},
					PricingAt:          slot.pricingAt,
					ChannelUsageFields: ChannelUsageFields{OriginalModel: alias, BillingModelSource: BillingModelSourceRequested},
				})
				require.NoError(t, err)
				require.NotNil(t, usageRepo.lastLog)
				log := usageRepo.lastLog
				require.Equal(t, alias, log.RequestedModel)
				require.NotNil(t, log.UpstreamModel)
				require.Equal(t, model.name, *log.UpstreamModel)
				require.WithinDuration(t, time.Now(), log.CreatedAt, time.Minute)
				require.False(t, log.CreatedAt.Equal(slot.pricingAt), "request pricing time must differ from record creation")
				customerTotal := 1000*inputPrice + 500*outputPrice + 1000*cachePrice
				require.InDelta(t, customerTotal, log.TotalCost, 1e-12)
				require.InDelta(t, customerTotal*0.8, log.ActualCost, 1e-12)
				require.Equal(t, 1, userRepo.deductCalls)
				require.InDelta(t, customerTotal*0.8, userRepo.lastAmount, 1e-12)
				require.NotNil(t, log.AccountStatsCost)
				require.InDelta(t, model.offPeakCost*slot.multiplier, *log.AccountStatsCost, 1e-12,
					"account cost must use the upstream model and historical PricingAt")
			})
		}
	}
}

func TestGatewayServiceRecordUsage_UsageLogWriteErrorDoesNotSkipBilling(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{inserted: false, err: MarkUsageLogCreateNotPersisted(context.Canceled)}
	userRepo := &openAIRecordUsageUserRepoStub{}
	subRepo := &openAIRecordUsageSubRepoStub{}
	quotaSvc := &openAIRecordUsageAPIKeyQuotaStub{}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, userRepo, subRepo)

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "gateway_not_persisted",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 6,
			},
			Model:    "claude-sonnet-4",
			Duration: time.Second,
		},
		APIKey: &APIKey{
			ID:    503,
			Quota: 100,
		},
		User:          &User{ID: 603},
		Account:       &Account{ID: 703},
		APIKeyService: quotaSvc,
	})

	require.NoError(t, err)
	require.Equal(t, 1, usageRepo.calls)
	require.Equal(t, 1, userRepo.deductCalls)
	require.Equal(t, 1, quotaSvc.quotaCalls)
}

func TestGatewayServiceRecordUsage_UsesFallbackRequestIDForUsageLog(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{}
	userRepo := &openAIRecordUsageUserRepoStub{}
	subRepo := &openAIRecordUsageSubRepoStub{}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, userRepo, subRepo)

	ctx := context.WithValue(context.Background(), ctxkey.RequestID, "gateway-local-fallback")
	err := svc.RecordUsage(ctx, &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 6,
			},
			Model:    "claude-sonnet-4",
			Duration: time.Second,
		},
		APIKey:  &APIKey{ID: 504},
		User:    &User{ID: 604},
		Account: &Account{ID: 704},
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	require.Equal(t, "local:gateway-local-fallback", usageRepo.lastLog.RequestID)
}

func TestGatewayServiceRecordUsage_PrefersClientRequestIDOverUpstreamRequestID(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{}
	billingRepo := &openAIRecordUsageBillingRepoStub{result: &UsageBillingApplyResult{Applied: true}}
	svc := newGatewayRecordUsageServiceWithBillingRepoForTest(usageRepo, billingRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})

	ctx := context.WithValue(context.Background(), ctxkey.ClientRequestID, "client-stable-123")
	ctx = context.WithValue(ctx, ctxkey.RequestID, "req-local-ignored")
	err := svc.RecordUsage(ctx, &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "upstream-volatile-456",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 6,
			},
			Model:    "claude-sonnet-4",
			Duration: time.Second,
		},
		APIKey:  &APIKey{ID: 506},
		User:    &User{ID: 606},
		Account: &Account{ID: 706},
	})

	require.NoError(t, err)
	require.NotNil(t, billingRepo.lastCmd)
	require.Equal(t, "client:client-stable-123", billingRepo.lastCmd.RequestID)
	require.NotNil(t, usageRepo.lastLog)
	require.Equal(t, "client:client-stable-123", usageRepo.lastLog.RequestID)
}

func TestGatewayServiceRecordUsage_GeneratesRequestIDWhenAllSourcesMissing(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{}
	billingRepo := &openAIRecordUsageBillingRepoStub{result: &UsageBillingApplyResult{Applied: true}}
	svc := newGatewayRecordUsageServiceWithBillingRepoForTest(usageRepo, billingRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 6,
			},
			Model:    "claude-sonnet-4",
			Duration: time.Second,
		},
		APIKey:  &APIKey{ID: 507},
		User:    &User{ID: 607},
		Account: &Account{ID: 707},
	})

	require.NoError(t, err)
	require.NotNil(t, billingRepo.lastCmd)
	require.True(t, strings.HasPrefix(billingRepo.lastCmd.RequestID, "generated:"))
	require.NotNil(t, usageRepo.lastLog)
	require.Equal(t, billingRepo.lastCmd.RequestID, usageRepo.lastLog.RequestID)
}

func TestGatewayServiceRecordUsage_DroppedUsageLogFallsBackToSyncCreate(t *testing.T) {
	// 计费成功后 best-effort 写入被丢弃（队列超时）时必须同步兜底，
	// 否则出现“已扣费但无 usage_log”的对账缺口（issue #3656）。
	usageRepo := &openAIRecordUsageBestEffortLogRepoStub{
		bestEffortErr: MarkUsageLogCreateDropped(errors.New("usage log best-effort queue full")),
	}
	billingRepo := &openAIRecordUsageBillingRepoStub{result: &UsageBillingApplyResult{Applied: true}}
	svc := newGatewayRecordUsageServiceWithBillingRepoForTest(usageRepo, billingRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "gateway_drop_usage_log",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 6,
			},
			Model:    "claude-sonnet-4",
			Duration: time.Second,
		},
		APIKey:  &APIKey{ID: 508},
		User:    &User{ID: 608},
		Account: &Account{ID: 708},
	})

	require.NoError(t, err)
	require.Equal(t, 1, usageRepo.bestEffortCalls)
	require.Equal(t, 1, usageRepo.createCalls)
	// 兜底调用使用的 ctx 必须仍然存活，不能带着已死的 ctx 走过场。
	require.NoError(t, usageRepo.lastCtxErr)
}

func TestGatewayServiceRecordUsage_BillingErrorWritesUnsettledUsageLog(t *testing.T) {
	usageRepo := &openAIRecordUsageLogRepoStub{}
	billingErr := errors.New("billing tx failed")
	billingRepo := &openAIRecordUsageBillingRepoStub{err: billingErr}
	userRepo := &openAIRecordUsageUserRepoStub{}
	subRepo := &openAIRecordUsageSubRepoStub{}
	svc := newGatewayRecordUsageServiceWithBillingRepoForTest(usageRepo, billingRepo, userRepo, subRepo)

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "gateway_billing_fail",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 6,
			},
			Model:    "claude-sonnet-4",
			Duration: time.Second,
		},
		APIKey:  &APIKey{ID: 505},
		User:    &User{ID: 605},
		Account: &Account{ID: 705},
	})

	require.ErrorIs(t, err, billingErr)
	require.Equal(t, 1, billingRepo.calls)
	require.Equal(t, 1, usageRepo.calls)
	require.NotNil(t, usageRepo.lastLog)
	require.Equal(t, 10, usageRepo.lastLog.InputTokens)
	require.Equal(t, 6, usageRepo.lastLog.OutputTokens)
	require.Greater(t, usageRepo.lastLog.InputCost, 0.0)
	require.Greater(t, usageRepo.lastLog.OutputCost, 0.0)
	require.Greater(t, usageRepo.lastLog.TotalCost, 0.0)
	require.Zero(t, usageRepo.lastLog.ActualCost)
}

func TestGatewayServiceRecordUsage_ReasoningEffortPersisted(t *testing.T) {
	usageRepo := &openAIRecordUsageBestEffortLogRepoStub{}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})

	effort := "max"
	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "effort_test",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 5,
			},
			Model:           "claude-opus-4-6",
			Duration:        time.Second,
			ReasoningEffort: &effort,
		},
		APIKey:  &APIKey{ID: 1},
		User:    &User{ID: 1},
		Account: &Account{ID: 1},
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	require.NotNil(t, usageRepo.lastLog.ReasoningEffort)
	require.Equal(t, "max", *usageRepo.lastLog.ReasoningEffort)
}

func TestGatewayServiceRecordUsage_ReasoningEffortNil(t *testing.T) {
	usageRepo := &openAIRecordUsageBestEffortLogRepoStub{}
	svc := newGatewayRecordUsageServiceForTest(usageRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})

	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID: "no_effort_test",
			Usage: ClaudeUsage{
				InputTokens:  10,
				OutputTokens: 5,
			},
			Model:    "claude-sonnet-4",
			Duration: time.Second,
		},
		APIKey:  &APIKey{ID: 1},
		User:    &User{ID: 1},
		Account: &Account{ID: 1},
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	require.Nil(t, usageRepo.lastLog.ReasoningEffort)
}

// newGatewayRecordUsageServiceWithResolverForTest mirrors production wiring for
// token billing: a pricing resolver plus a grouped API key select the unified
// billing path, which is the only one that honours the service tier.
func newGatewayRecordUsageServiceWithResolverForTest(usageRepo UsageLogRepository) (*GatewayService, *APIKey) {
	svc := newGatewayRecordUsageServiceForTest(usageRepo, &openAIRecordUsageUserRepoStub{}, &openAIRecordUsageSubRepoStub{})
	svc.resolver = NewModelPricingResolver(nil, svc.billingService)
	groupID := int64(7)
	return svc, &APIKey{ID: 1, GroupID: &groupID, Group: &Group{ID: groupID, RateMultiplier: 1.0}}
}

func TestGatewayServiceRecordUsage_FastSpeedDowngradedByUpstreamResponse(t *testing.T) {
	usageRepo := &openAIRecordUsageBestEffortLogRepoStub{}
	svc, apiKey := newGatewayRecordUsageServiceWithResolverForTest(usageRepo)

	tier := "fast"
	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID:                   "fast_downgraded_test",
			Usage:                       ClaudeUsage{InputTokens: 100, OutputTokens: 50},
			Model:                       "claude-opus-5",
			Duration:                    time.Second,
			ServiceTier:                 &tier,
			UpstreamResponseServiceTier: "standard",
		},
		APIKey:  apiKey,
		User:    &User{ID: 1},
		Account: &Account{ID: 1, Platform: PlatformAnthropic},
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	require.NotNil(t, usageRepo.lastLog.ServiceTier)
	require.Equal(t, "standard", *usageRepo.lastLog.ServiceTier)

	tokens := UsageTokens{InputTokens: 100, OutputTokens: 50}
	standardCost, err := svc.billingService.CalculateCost("claude-opus-5", tokens, 1.0)
	require.NoError(t, err)
	fastCost, err := svc.billingService.CalculateCostWithServiceTier("claude-opus-5", tokens, 1.0, "fast")
	require.NoError(t, err)
	require.Greater(t, fastCost.TotalCost, standardCost.TotalCost, "fast mode must carry a premium for the test to be meaningful")
	require.InDelta(t, standardCost.TotalCost, usageRepo.lastLog.TotalCost, 1e-10)
}

func TestGatewayServiceRecordUsage_FastSpeedHonouredKeepsPremium(t *testing.T) {
	usageRepo := &openAIRecordUsageBestEffortLogRepoStub{}
	svc, apiKey := newGatewayRecordUsageServiceWithResolverForTest(usageRepo)

	tier := "fast"
	err := svc.RecordUsage(context.Background(), &RecordUsageInput{
		Result: &ForwardResult{
			RequestID:                   "fast_honoured_test",
			Usage:                       ClaudeUsage{InputTokens: 100, OutputTokens: 50},
			Model:                       "claude-opus-5",
			Duration:                    time.Second,
			ServiceTier:                 &tier,
			UpstreamResponseServiceTier: "fast",
		},
		APIKey:  apiKey,
		User:    &User{ID: 1},
		Account: &Account{ID: 1, Platform: PlatformAnthropic},
	})

	require.NoError(t, err)
	require.NotNil(t, usageRepo.lastLog)
	require.Equal(t, "fast", *usageRepo.lastLog.ServiceTier)

	fastCost, err := svc.billingService.CalculateCostWithServiceTier("claude-opus-5", UsageTokens{InputTokens: 100, OutputTokens: 50}, 1.0, "fast")
	require.NoError(t, err)
	require.InDelta(t, fastCost.TotalCost, usageRepo.lastLog.TotalCost, 1e-10)
}