package app

import (
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/geo-platform/tenant-api/internal/shared/response"
)

func TestResolveDashboardDateWindowAtUsesBusinessTimezone(t *testing.T) {
	loc := time.FixedZone("CST", 8*60*60)
	now := time.Date(2026, 4, 12, 0, 5, 0, 0, loc)

	startDate, endDate, err := resolveDashboardDateWindowAt(7, "2026-04-12", now, loc)
	require.NoError(t, err)

	assert.Equal(t, time.Date(2026, 4, 6, 0, 0, 0, 0, loc), startDate)
	assert.Equal(t, time.Date(2026, 4, 12, 0, 0, 0, 0, loc), endDate)
}

func TestResolveDashboardDateWindowAtRejectsFutureBusinessDay(t *testing.T) {
	loc := time.FixedZone("CST", 8*60*60)
	now := time.Date(2026, 4, 12, 0, 5, 0, 0, loc)

	_, _, err := resolveDashboardDateWindowAt(7, "2026-04-13", now, loc)
	require.Error(t, err)

	appErr := response.Normalize(err)
	assert.Equal(t, 40031, appErr.Code)
	assert.Equal(t, "invalid_business_date", appErr.Message)
	assert.Equal(t, "business_date must not be later than today", appErr.Detail)
}

func TestParseDetailDateRangeAtDefaultsToCurrentBusinessDay(t *testing.T) {
	loc := time.FixedZone("CST", 8*60*60)
	now := time.Date(2026, 4, 12, 0, 5, 0, 0, loc)

	fromDate, toDate, err := parseDetailDateRangeAt("", "", now, loc)
	require.NoError(t, err)

	expected := time.Date(2026, 4, 12, 0, 0, 0, 0, loc)
	assert.Equal(t, expected, fromDate)
	assert.Equal(t, expected, toDate)
}

func TestMonitoringBusinessDayAndDateAtUsesShanghaiTimezone(t *testing.T) {
	now := time.Date(2026, 4, 11, 17, 19, 0, 0, time.UTC)

	businessDay, businessDate := monitoringBusinessDayAndDateAt(now)

	assert.Equal(t, time.Date(2026, 4, 12, 0, 0, 0, 0, monitoringBusinessLocation()), businessDay)
	assert.Equal(t, "2026-04-12", businessDate)
}

func TestEncodeMonitoringProjectionRebuildEnvelopePreservesBusinessDate(t *testing.T) {
	businessDay := time.Date(2026, 4, 12, 0, 0, 0, 0, monitoringBusinessLocation())

	payload, err := encodeMonitoringProjectionRebuildEnvelope(1, 2, businessDay, "test")
	require.NoError(t, err)

	envelope, err := decodeMonitoringProjectionRebuildEnvelope(payload)
	require.NoError(t, err)
	assert.Equal(t, "2026-04-12", envelope.BusinessDate)
}

func TestFilterMonitoringPlatformsReturnsSelectedPlatform(t *testing.T) {
	platforms := []monitoringPlatformMetadata{
		{ID: "deepseek", Name: "DeepSeek"},
		{ID: "qwen", Name: "通义千问"},
		{ID: "doubao", Name: "豆包"},
	}
	selected := "qwen"

	filtered := filterMonitoringPlatforms(platforms, &selected)

	assert.Equal(t, []monitoringPlatformMetadata{
		{ID: "qwen", Name: "通义千问"},
	}, filtered)
}

func TestFilterMonitoringPlatformsDropsUnauthorizedSelection(t *testing.T) {
	platforms := []monitoringPlatformMetadata{
		{ID: "deepseek", Name: "DeepSeek"},
	}
	selected := "doubao"

	filtered := filterMonitoringPlatforms(platforms, &selected)

	assert.Empty(t, filtered)
}

func TestNormalizeMonitoringPlatformIDCanonicalizesLatestIDs(t *testing.T) {
	assert.Equal(t, "qwen", normalizeMonitoringPlatformID(" QWEN "))
	assert.Equal(t, "wenxin", normalizeMonitoringPlatformID("WenXin"))
	assert.Equal(t, "yuanbao", normalizeMonitoringPlatformID("yuanbao"))
}

func TestFilterMonitoringPlatformsMatchesCanonicalPlatform(t *testing.T) {
	platforms := []monitoringPlatformMetadata{
		{ID: "qwen", Name: "通义千问"},
	}
	selected := "qwen"

	filtered := filterMonitoringPlatforms(platforms, &selected)

	assert.Equal(t, []monitoringPlatformMetadata{
		{ID: "qwen", Name: "通义千问"},
	}, filtered)
}

func TestIntersectMonitoringPlatformsAcceptsCanonicalIDs(t *testing.T) {
	enabled := []monitoringPlatformMetadata{
		{ID: "qwen", Name: "通义千问"},
		{ID: "wenxin", Name: "文心一言"},
	}

	filtered, err := intersectMonitoringPlatforms(enabled, []string{"qwen", "wenxin"})
	require.NoError(t, err)
	assert.Equal(t, []monitoringPlatformMetadata{
		{ID: "qwen", Name: "通义千问"},
		{ID: "wenxin", Name: "文心一言"},
	}, filtered)
}

func TestReconcileEnabledMonitoringPlatformsKeepsAuthorizedSubset(t *testing.T) {
	assert.Equal(t, []string{"deepseek", "doubao", "qwen"}, reconcileEnabledMonitoringPlatforms([]string{"deepseek", "qwen", "doubao"}))
	assert.Empty(t, reconcileEnabledMonitoringPlatforms(nil))
	assert.Empty(t, resolveMonitoringPlatforms(nil))
}

func TestMonitoringPlatformAuthorizationStatus(t *testing.T) {
	clientID := uuid.New()

	assert.Equal(t, monitoringPlatformAuthorizationNoDesktopClient, monitoringPlatformAuthorizationStatus(monitoringQuotaConfig{}))
	assert.Equal(t, monitoringPlatformAuthorizationNoAuthorizedPlatforms, monitoringPlatformAuthorizationStatus(monitoringQuotaConfig{
		PrimaryClientID: &clientID,
	}))
	assert.Equal(t, monitoringPlatformAuthorizationAuthorized, monitoringPlatformAuthorizationStatus(monitoringQuotaConfig{
		PrimaryClientID:  &clientID,
		EnabledPlatforms: []string{"qwen"},
	}))
}

func TestDefaultMonitoringPlatformMetadataReturnsFullCatalogCopy(t *testing.T) {
	platforms := defaultMonitoringPlatformMetadata()

	require.Len(t, platforms, 6)
	assert.Equal(t, []string{"yuanbao", "kimi", "wenxin", "deepseek", "doubao", "qwen"}, monitoringPlatformIDs(platforms))

	platforms[0].ID = "mutated"
	assert.Equal(t, "yuanbao", defaultMonitoringPlatformMetadata()[0].ID)
}

func TestLoadMonitoringProjectionPlatformsReturnsFullCatalog(t *testing.T) {
	platforms, err := loadMonitoringProjectionPlatforms(nil, nil, 0, 0, time.Time{})
	require.NoError(t, err)

	assert.Equal(t, []string{"yuanbao", "kimi", "wenxin", "deepseek", "doubao", "qwen"}, monitoringPlatformIDs(platforms))
}

func TestApplyDerivedRatesToOverviewSnapshotUsesAllSamplesForMentionRate(t *testing.T) {
	day := time.Date(2026, 4, 22, 0, 0, 0, 0, monitoringBusinessLocation())
	snapshot := monitoringOverviewSnapshot{Date: day}
	derived := newMonitoringDerivedMetrics()
	derived.ByDate["2026-04-22"] = monitoringDerivedRateStats{
		Total:            4,
		MentionedCount:   1,
		Top1Count:        1,
		FirstRecommend:   1,
		PositiveMentions: 1,
	}
	derived.ByDatePlatform["2026-04-22"] = map[string]monitoringDerivedRateStats{
		"qwen":     {Total: 1, MentionedCount: 1},
		"deepseek": {Total: 3, MentionedCount: 0},
	}

	applyDerivedRatesToOverviewSnapshot(&snapshot, derived)

	require.True(t, snapshot.MentionRate.Valid)
	require.True(t, snapshot.Top1MentionRate.Valid)
	require.True(t, snapshot.FirstRecommendRate.Valid)
	require.True(t, snapshot.PositiveMentionRate.Valid)
	assert.InDelta(t, 0.25, snapshot.MentionRate.Float64, 0.0001)
	assert.InDelta(t, 0.25, snapshot.Top1MentionRate.Float64, 0.0001)
	assert.InDelta(t, 0.25, snapshot.FirstRecommendRate.Float64, 0.0001)
	assert.InDelta(t, 0.25, snapshot.PositiveMentionRate.Float64, 0.0001)
}