package database_test

import (
	"log/slog"
	"net/http"
	"testing"
	"time"

	"github.com/google/uuid"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"gorm.io/gorm"
	"sneak.berlin/go/webhooker/internal/database"
	"sneak.berlin/go/webhooker/internal/database/databasetest"
)

// withFixedNow returns db with GORM's clock stopped at a time in UTC,
// so that the created and updated times it writes come back from
// SQLite equal to the row written, which holds them in UTC.
func withFixedNow(db *gorm.DB) (*gorm.DB, time.Time) {
	at := time.Date(2026, 10, 13, 12, 30, 45, 123456789, time.UTC)

	return db.Session(&gorm.Session{
		NowFunc: func() time.Time { return at },
	}), at
}

// newBaseModel returns a BaseModel with a new ID.
func newBaseModel() database.BaseModel {
	return database.BaseModel{ID: uuid.New().String()}
}

// assertRoundTrip writes row, which must be the only row of its
// table, and reads back the same row.
func assertRoundTrip[T any](t *testing.T, db *gorm.DB, row *T) {
	t.Helper()

	require.NoError(t, db.Create(row).Error)

	var got T

	require.NoError(t, db.First(&got).Error)
	assert.Equal(t, *row, got)
}

// TestMainSchemaHoldsEveryModel writes a row of each main database
// model, every field set, into a database made from its SQL files.
func TestMainSchemaHoldsEveryModel(t *testing.T) {
	t.Parallel()

	mainDB, err := database.Open(
		t.TempDir(), slog.New(slog.DiscardHandler),
	)
	require.NoError(t, err)

	t.Cleanup(func() { _ = mainDB.Close() })

	db, at := withFixedNow(mainDB.DB())

	assertRoundTrip(t, db, &database.Setting{
		Key: "session_key", Value: "value",
	})
	assertRoundTrip(t, db, &database.User{
		BaseModel: newBaseModel(),
		Username:  "user",
		Password:  "password hash",
	})
	assertRoundTrip(t, db, &database.APIKey{
		BaseModel:   newBaseModel(),
		UserID:      uuid.New().String(),
		Key:         "key",
		Description: "API key description",
		LastUsedAt:  &at,
	})
	assertRoundTrip(t, db, &database.Webhook{
		BaseModel:     newBaseModel(),
		UserID:        uuid.New().String(),
		Name:          "webhook",
		Description:   "webhook description",
		RetentionDays: 7,
	})
	assertRoundTrip(t, db, &database.Entrypoint{
		BaseModel:   newBaseModel(),
		WebhookID:   uuid.New().String(),
		Path:        uuid.New().String(),
		Description: "entrypoint description",
		Active:      true,
	})
	assertRoundTrip(t, db, &database.Target{
		BaseModel:  newBaseModel(),
		WebhookID:  uuid.New().String(),
		Name:       "target",
		Type:       database.TargetTypeHTTP,
		Active:     true,
		Config:     `{"url":"https://example.com/"}`,
		MaxRetries: 3,
	})
}

// TestEventSchemaHoldsEveryModel does the same for a webhook's event
// database, which the manager makes from its SQL files.
func TestEventSchemaHoldsEveryModel(t *testing.T) {
	t.Parallel()

	mgr := databasetest.NewWebhookDBManager(t, t.TempDir())

	t.Cleanup(func() { _ = mgr.CloseAll() })

	events, err := mgr.GetDB(uuid.New().String())
	require.NoError(t, err)

	db, at := withFixedNow(events)
	source := uuid.New().String()

	assertRoundTrip(t, db, &database.Event{
		BaseModel:         newBaseModel(),
		WebhookID:         uuid.New().String(),
		EntrypointID:      uuid.New().String(),
		Method:            http.MethodPost,
		RawQuery:          "a=1",
		Headers:           `{"X":"Y"}`,
		Body:              "body",
		ContentType:       "text/plain",
		BodyBytes:         4,
		ResubmittedFromID: &source,
	})
	assertRoundTrip(t, db, &database.Delivery{
		BaseModel:  newBaseModel(),
		EventID:    uuid.New().String(),
		TargetID:   uuid.New().String(),
		Status:     database.DeliveryStatusDelivered,
		FinishedAt: &at,
		Replay:     true,
	})
	assertRoundTrip(t, db, &database.DeliveryResult{
		BaseModel:    newBaseModel(),
		DeliveryID:   uuid.New().String(),
		AttemptNum:   2,
		Success:      true,
		StatusCode:   200,
		ResponseBody: "ok",
		Error:        "error",
		Duration:     15,
	})
	assertRoundTrip(t, db, &database.TargetTotals{
		TargetID:          uuid.New().String(),
		Deliveries:        5,
		Delivered:         3,
		Failed:            1,
		DeliveriesRemoved: 2,
		FailedRemoved:     1,
	})
	assertRoundTrip(t, db, &database.EntrypointTotals{
		EntrypointID: uuid.New().String(), LastEventAt: at,
	})

	// A new event database has its one row of event totals already.
	require.NoError(t, database.AddEventTotals(db, database.EventTotals{
		Events: 3, EventsRemoved: 1, LastEventAt: &at,
	}))

	var totals []database.EventTotals

	require.NoError(t, db.Find(&totals).Error)
	assert.Equal(t, []database.EventTotals{{
		ID: 1, Events: 3, EventsRemoved: 1, LastEventAt: &at,
	}}, totals)
}