package updategame_test

import (
	"context"
	"io"
	"log/slog"
	"testing"
	"time"

	"galaxy/lobby/internal/adapters/gamestub"
	"galaxy/lobby/internal/domain/common"
	"galaxy/lobby/internal/domain/game"
	"galaxy/lobby/internal/ports"
	"galaxy/lobby/internal/service/shared"
	"galaxy/lobby/internal/service/updategame"

	"github.com/stretchr/testify/require"
)

func silentLogger() *slog.Logger {
	return slog.New(slog.NewTextHandler(io.Discard, nil))
}

func fixedClock(at time.Time) func() time.Time {
	return func() time.Time { return at }
}

// seedDraftGame stores a draft record with sensible defaults for tests and
// returns the persisted record.
func seedDraftGame(
	t *testing.T,
	store *gamestub.Store,
	id common.GameID,
	gameType game.GameType,
	ownerUserID string,
	now time.Time,
) game.Game {
	t.Helper()

	record, err := game.New(game.NewGameInput{
		GameID:              id,
		GameName:            "Seed Game",
		GameType:            gameType,
		OwnerUserID:         ownerUserID,
		MinPlayers:          2,
		MaxPlayers:          4,
		StartGapHours:       4,
		StartGapPlayers:     1,
		EnrollmentEndsAt:    now.Add(24 * time.Hour),
		TurnSchedule:        "0 */6 * * *",
		TargetEngineVersion: "1.0.0",
		Now:                 now,
	})
	require.NoError(t, err)
	require.NoError(t, store.Save(context.Background(), record))

	return record
}

func newService(t *testing.T, store ports.GameStore, clock func() time.Time) *updategame.Service {
	t.Helper()

	svc, err := updategame.NewService(updategame.Dependencies{
		Games:  store,
		Clock:  clock,
		Logger: silentLogger(),
	})
	require.NoError(t, err)
	return svc
}

func TestHandleAdminFullEditInDraft(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)
	store := gamestub.NewStore()
	seedDraftGame(t, store, "game-a", game.GameTypePublic, "", now)

	later := now.Add(30 * time.Minute)
	service := newService(t, store, fixedClock(later))

	updated, err := service.Handle(context.Background(), updategame.Input{
		Actor:               shared.NewAdminActor(),
		GameID:              "game-a",
		GameName:            new("Spring Cup"),
		Description:         new("Warm-up round"),
		MinPlayers:          new(3),
		MaxPlayers:          new(6),
		StartGapHours:       new(2),
		StartGapPlayers:     new(2),
		TurnSchedule:        new("0 9 * * *"),
		TargetEngineVersion: new("1.1.0"),
	})
	require.NoError(t, err)
	require.Equal(t, "Spring Cup", updated.GameName)
	require.Equal(t, "Warm-up round", updated.Description)
	require.Equal(t, 3, updated.MinPlayers)
	require.Equal(t, 6, updated.MaxPlayers)
	require.Equal(t, 2, updated.StartGapHours)
	require.Equal(t, 2, updated.StartGapPlayers)
	require.Equal(t, "0 9 * * *", updated.TurnSchedule)
	require.Equal(t, "1.1.0", updated.TargetEngineVersion)
	require.Equal(t, later.UTC(), updated.UpdatedAt)
}

func TestHandleOwnerEditInDraft(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)
	store := gamestub.NewStore()
	seedDraftGame(t, store, "game-private", game.GameTypePrivate, "user-1", now)

	service := newService(t, store, fixedClock(now.Add(time.Hour)))

	updated, err := service.Handle(context.Background(), updategame.Input{
		Actor:       shared.NewUserActor("user-1"),
		GameID:      "game-private",
		Description: new("Private scrim"),
	})
	require.NoError(t, err)
	require.Equal(t, "Private scrim", updated.Description)
}

func TestHandleNonOwnerForbidden(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)
	store := gamestub.NewStore()
	seedDraftGame(t, store, "game-private", game.GameTypePrivate, "user-1", now)

	service := newService(t, store, fixedClock(now.Add(time.Hour)))

	_, err := service.Handle(context.Background(), updategame.Input{
		Actor:       shared.NewUserActor("user-2"),
		GameID:      "game-private",
		Description: new("drive-by"),
	})
	require.ErrorIs(t, err, shared.ErrForbidden)
}

func TestHandleUserCannotEditPublicGame(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)
	store := gamestub.NewStore()
	seedDraftGame(t, store, "game-public", game.GameTypePublic, "", now)

	service := newService(t, store, fixedClock(now.Add(time.Hour)))

	_, err := service.Handle(context.Background(), updategame.Input{
		Actor:       shared.NewUserActor("user-1"),
		GameID:      "game-public",
		Description: new("drive-by"),
	})
	require.ErrorIs(t, err, shared.ErrForbidden)
}

func TestHandleEnrollmentOpenDescriptionOnly(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)
	store := gamestub.NewStore()
	record := seedDraftGame(t, store, "game-open", game.GameTypePublic, "", now)

	// Force status to enrollment_open via UpdateStatus.
	require.NoError(t, store.UpdateStatus(context.Background(), ports.UpdateStatusInput{
		GameID:       record.GameID,
		ExpectedFrom: game.StatusDraft,
		To:           game.StatusEnrollmentOpen,
		Trigger:      game.TriggerCommand,
		At:           now.Add(5 * time.Minute),
	}))

	service := newService(t, store, fixedClock(now.Add(time.Hour)))

	updated, err := service.Handle(context.Background(), updategame.Input{
		Actor:       shared.NewAdminActor(),
		GameID:      record.GameID,
		Description: new("Updated while enrollment is open"),
	})
	require.NoError(t, err)
	require.Equal(t, "Updated while enrollment is open", updated.Description)
	require.Equal(t, game.StatusEnrollmentOpen, updated.Status)
}

func TestHandleEnrollmentOpenNonDescriptionRejected(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)
	store := gamestub.NewStore()
	record := seedDraftGame(t, store, "game-open", game.GameTypePublic, "", now)

	require.NoError(t, store.UpdateStatus(context.Background(), ports.UpdateStatusInput{
		GameID:       record.GameID,
		ExpectedFrom: game.StatusDraft,
		To:           game.StatusEnrollmentOpen,
		Trigger:      game.TriggerCommand,
		At:           now.Add(5 * time.Minute),
	}))

	service := newService(t, store, fixedClock(now.Add(time.Hour)))

	_, err := service.Handle(context.Background(), updategame.Input{
		Actor:      shared.NewAdminActor(),
		GameID:     record.GameID,
		MinPlayers: new(5),
	})
	require.ErrorIs(t, err, game.ErrConflict)
}

func TestHandleTerminalStatusRejected(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)
	store := gamestub.NewStore()
	record := seedDraftGame(t, store, "game-cancel", game.GameTypePublic, "", now)

	require.NoError(t, store.UpdateStatus(context.Background(), ports.UpdateStatusInput{
		GameID:       record.GameID,
		ExpectedFrom: game.StatusDraft,
		To:           game.StatusCancelled,
		Trigger:      game.TriggerCommand,
		At:           now.Add(10 * time.Minute),
	}))

	service := newService(t, store, fixedClock(now.Add(time.Hour)))

	_, err := service.Handle(context.Background(), updategame.Input{
		Actor:       shared.NewAdminActor(),
		GameID:      record.GameID,
		Description: new("ignored"),
	})
	require.ErrorIs(t, err, game.ErrConflict)
}

func TestHandleNotFound(t *testing.T) {
	t.Parallel()

	store := gamestub.NewStore()
	service := newService(t, store, fixedClock(time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)))

	_, err := service.Handle(context.Background(), updategame.Input{
		Actor:       shared.NewAdminActor(),
		GameID:      "game-missing",
		Description: new("nope"),
	})
	require.ErrorIs(t, err, game.ErrNotFound)
}

func TestHandleValidationFailurePropagates(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)
	store := gamestub.NewStore()
	seedDraftGame(t, store, "game-a", game.GameTypePublic, "", now)

	service := newService(t, store, fixedClock(now.Add(time.Hour)))

	_, err := service.Handle(context.Background(), updategame.Input{
		Actor:      shared.NewAdminActor(),
		GameID:     "game-a",
		MinPlayers: new(10),
		MaxPlayers: new(5),
	})
	require.Error(t, err)
	require.Contains(t, err.Error(), "max players")
}

func TestHandleInvalidActorReturnsError(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)
	store := gamestub.NewStore()
	service := newService(t, store, fixedClock(now))

	_, err := service.Handle(context.Background(), updategame.Input{
		Actor:       shared.Actor{Kind: shared.ActorKindUser}, // missing user id
		GameID:      "game-a",
		Description: new("x"),
	})
	require.Error(t, err)
	require.Contains(t, err.Error(), "actor")
}

func TestHandleInvalidGameID(t *testing.T) {
	t.Parallel()

	now := time.Date(2026, 4, 24, 10, 0, 0, 0, time.UTC)
	store := gamestub.NewStore()
	service := newService(t, store, fixedClock(now))

	_, err := service.Handle(context.Background(), updategame.Input{
		Actor:       shared.NewAdminActor(),
		GameID:      "bad",
		Description: new("x"),
	})
	require.Error(t, err)
}

func TestInputHasNonDescriptionFields(t *testing.T) {
	t.Parallel()

	require.False(t, updategame.Input{}.HasNonDescriptionFields())
	require.False(t, updategame.Input{Description: new("x")}.HasNonDescriptionFields())
	require.True(t, updategame.Input{GameName: new("x")}.HasNonDescriptionFields())
	require.True(t, updategame.Input{MinPlayers: new(1)}.HasNonDescriptionFields())
}