package manualreadytostart_test

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

	"galaxy/lobby/internal/adapters/gameinmem"
	"galaxy/lobby/internal/adapters/inviteinmem"
	"galaxy/lobby/internal/adapters/membershipinmem"
	"galaxy/lobby/internal/adapters/mocks"
	"galaxy/lobby/internal/domain/common"
	"galaxy/lobby/internal/domain/game"
	"galaxy/lobby/internal/domain/invite"
	"galaxy/lobby/internal/domain/membership"
	"galaxy/lobby/internal/service/manualreadytostart"
	"galaxy/lobby/internal/service/shared"
	"galaxy/notificationintent"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"go.uber.org/mock/gomock"
)

type intentRec struct {
	mu        sync.Mutex
	published []notificationintent.Intent
}

func (r *intentRec) record(_ context.Context, intent notificationintent.Intent) (string, error) {
	r.mu.Lock()
	defer r.mu.Unlock()
	r.published = append(r.published, intent)
	return "1", nil
}

func (r *intentRec) snapshot() []notificationintent.Intent {
	r.mu.Lock()
	defer r.mu.Unlock()
	return append([]notificationintent.Intent(nil), r.published...)
}

func newIntentMock(t *testing.T, rec *intentRec) *mocks.MockIntentPublisher {
	t.Helper()
	m := mocks.NewMockIntentPublisher(gomock.NewController(t))
	m.EXPECT().Publish(gomock.Any(), gomock.Any()).DoAndReturn(rec.record).AnyTimes()
	return m
}

const (
	publicGameID  = common.GameID("game-public")
	privateGameID = common.GameID("game-private")
	ownerUserID   = "user-owner"
)

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 } }

type fixture struct {
	now         time.Time
	games       *gameinmem.Store
	invites     *inviteinmem.Store
	memberships *membershipinmem.Store
	intentRec   *intentRec
	intents     *mocks.MockIntentPublisher
}

func newFixture(t *testing.T) *fixture {
	t.Helper()
	now := time.Date(2026, 4, 25, 10, 0, 0, 0, time.UTC)
	rec := &intentRec{}
	f := &fixture{
		now:         now,
		games:       gameinmem.NewStore(),
		invites:     inviteinmem.NewStore(),
		memberships: membershipinmem.NewStore(),
		intentRec:   rec,
	}
	f.intents = newIntentMock(t, rec)
	return f
}

func (f *fixture) addGame(t *testing.T, gameID common.GameID, gameType game.GameType, owner string, minPlayers int) game.Game {
	t.Helper()
	rec, err := game.New(game.NewGameInput{
		GameID:              gameID,
		GameName:            "Test Game",
		GameType:            gameType,
		OwnerUserID:         owner,
		MinPlayers:          minPlayers,
		MaxPlayers:          minPlayers + 2,
		StartGapHours:       2,
		StartGapPlayers:     1,
		EnrollmentEndsAt:    f.now.Add(24 * time.Hour),
		TurnSchedule:        "0 */6 * * *",
		TargetEngineVersion: "1.0.0",
		Now:                 f.now,
	})
	require.NoError(t, err)
	rec.Status = game.StatusEnrollmentOpen
	require.NoError(t, f.games.Save(context.Background(), rec))
	return rec
}

func (f *fixture) addActiveMember(t *testing.T, membershipID common.MembershipID, gameID common.GameID, userID string) {
	t.Helper()
	mem, err := membership.New(membership.NewMembershipInput{
		MembershipID: membershipID,
		GameID:       gameID,
		UserID:       userID,
		RaceName:     "Race " + userID,
		CanonicalKey: "race-" + userID,
		Now:          f.now,
	})
	require.NoError(t, err)
	require.NoError(t, f.memberships.Save(context.Background(), mem))
}

func (f *fixture) addCreatedInvite(t *testing.T, inviteID common.InviteID, gameID common.GameID, owner, invitee string) {
	t.Helper()
	rec, err := invite.New(invite.NewInviteInput{
		InviteID:      inviteID,
		GameID:        gameID,
		InviterUserID: owner,
		InviteeUserID: invitee,
		Now:           f.now,
		ExpiresAt:     f.now.Add(24 * time.Hour),
	})
	require.NoError(t, err)
	require.NoError(t, f.invites.Save(context.Background(), rec))
}

func (f *fixture) newService(t *testing.T) *manualreadytostart.Service {
	t.Helper()
	svc, err := manualreadytostart.NewService(manualreadytostart.Dependencies{
		Games:       f.games,
		Memberships: f.memberships,
		Invites:     f.invites,
		Intents:     f.intents,
		Clock:       fixedClock(f.now),
		Logger:      silentLogger(),
	})
	require.NoError(t, err)
	return svc
}

func TestHandleAdminClosesPublicEnrollment(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	f.addGame(t, publicGameID, game.GameTypePublic, "", 2)
	f.addActiveMember(t, "membership-1", publicGameID, "user-a")
	f.addActiveMember(t, "membership-2", publicGameID, "user-b")

	got, err := f.newService(t).Handle(context.Background(), manualreadytostart.Input{
		Actor:  shared.NewAdminActor(),
		GameID: publicGameID,
	})
	require.NoError(t, err)
	assert.Equal(t, game.StatusReadyToStart, got.Status)
}

func TestHandleOwnerClosesPrivateEnrollmentAndExpiresInvites(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	f.addGame(t, privateGameID, game.GameTypePrivate, ownerUserID, 2)
	f.addActiveMember(t, "membership-1", privateGameID, "user-a")
	f.addActiveMember(t, "membership-2", privateGameID, "user-b")
	f.addCreatedInvite(t, "invite-1", privateGameID, ownerUserID, "user-c")
	f.addCreatedInvite(t, "invite-2", privateGameID, ownerUserID, "user-d")

	got, err := f.newService(t).Handle(context.Background(), manualreadytostart.Input{
		Actor:  shared.NewUserActor(ownerUserID),
		GameID: privateGameID,
	})
	require.NoError(t, err)
	assert.Equal(t, game.StatusReadyToStart, got.Status)

	for _, id := range []common.InviteID{"invite-1", "invite-2"} {
		rec, err := f.invites.Get(context.Background(), id)
		require.NoError(t, err)
		assert.Equal(t, invite.StatusExpired, rec.Status)
	}

	intents := f.intentRec.snapshot()
	require.Len(t, intents, 2)
	for _, intent := range intents {
		assert.Equal(t, notificationintent.NotificationTypeLobbyInviteExpired, intent.NotificationType)
		assert.Equal(t, []string{ownerUserID}, intent.RecipientUserIDs)
	}
}

func TestHandleNonOwnerOnPrivateForbidden(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	f.addGame(t, privateGameID, game.GameTypePrivate, ownerUserID, 2)
	f.addActiveMember(t, "membership-1", privateGameID, "user-a")
	f.addActiveMember(t, "membership-2", privateGameID, "user-b")

	_, err := f.newService(t).Handle(context.Background(), manualreadytostart.Input{
		Actor:  shared.NewUserActor("user-impostor"),
		GameID: privateGameID,
	})
	require.ErrorIs(t, err, shared.ErrForbidden)
}

func TestHandleUserOnPublicForbidden(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	f.addGame(t, publicGameID, game.GameTypePublic, "", 2)
	f.addActiveMember(t, "membership-1", publicGameID, "user-a")
	f.addActiveMember(t, "membership-2", publicGameID, "user-b")

	_, err := f.newService(t).Handle(context.Background(), manualreadytostart.Input{
		Actor:  shared.NewUserActor("user-a"),
		GameID: publicGameID,
	})
	require.ErrorIs(t, err, shared.ErrForbidden)
}

func TestHandleGameNotFound(t *testing.T) {
	t.Parallel()
	f := newFixture(t)

	_, err := f.newService(t).Handle(context.Background(), manualreadytostart.Input{
		Actor:  shared.NewAdminActor(),
		GameID: publicGameID,
	})
	require.ErrorIs(t, err, game.ErrNotFound)
}

func TestHandleStatusNotEnrollmentOpenConflict(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	rec := f.addGame(t, publicGameID, game.GameTypePublic, "", 2)
	rec.Status = game.StatusDraft
	require.NoError(t, f.games.Save(context.Background(), rec))

	_, err := f.newService(t).Handle(context.Background(), manualreadytostart.Input{
		Actor:  shared.NewAdminActor(),
		GameID: publicGameID,
	})
	require.ErrorIs(t, err, game.ErrConflict)
}

func TestHandleBelowMinPlayersConflict(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	f.addGame(t, publicGameID, game.GameTypePublic, "", 3)
	f.addActiveMember(t, "membership-1", publicGameID, "user-a")
	f.addActiveMember(t, "membership-2", publicGameID, "user-b")

	_, err := f.newService(t).Handle(context.Background(), manualreadytostart.Input{
		Actor:  shared.NewAdminActor(),
		GameID: publicGameID,
	})
	require.ErrorIs(t, err, game.ErrConflict)

	current, err := f.games.Get(context.Background(), publicGameID)
	require.NoError(t, err)
	assert.Equal(t, game.StatusEnrollmentOpen, current.Status)
	assert.Empty(t, f.intentRec.snapshot())
}

func TestHandleEmptyInvitesProducesNoNotifications(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	f.addGame(t, privateGameID, game.GameTypePrivate, ownerUserID, 2)
	f.addActiveMember(t, "membership-1", privateGameID, "user-a")
	f.addActiveMember(t, "membership-2", privateGameID, "user-b")

	_, err := f.newService(t).Handle(context.Background(), manualreadytostart.Input{
		Actor:  shared.NewUserActor(ownerUserID),
		GameID: privateGameID,
	})
	require.NoError(t, err)
	assert.Empty(t, f.intentRec.snapshot())
}