package shared_test

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

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

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

const (
	closeOwnerUserID = "user-owner"
	closeGameID      = common.GameID("game-private")
	closeGameName    = "Friends Only"
)

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

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

func (r *intentRec) record(_ context.Context, intent notificationintent.Intent) (string, error) {
	r.mu.Lock()
	defer r.mu.Unlock()
	if r.err != nil {
		return "", r.err
	}
	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 (r *intentRec) setErr(err error) {
	r.mu.Lock()
	defer r.mu.Unlock()
	r.err = err
}

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
}

type closeFixture struct {
	now       time.Time
	games     *gameinmem.Store
	invites   *inviteinmem.Store
	intentRec *intentRec
	intents   *mocks.MockIntentPublisher
	game      game.Game
}

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

	gameRecord, err := game.New(game.NewGameInput{
		GameID:              closeGameID,
		GameName:            closeGameName,
		GameType:            game.GameTypePrivate,
		OwnerUserID:         closeOwnerUserID,
		MinPlayers:          2,
		MaxPlayers:          4,
		StartGapHours:       2,
		StartGapPlayers:     1,
		EnrollmentEndsAt:    now.Add(24 * time.Hour),
		TurnSchedule:        "0 */6 * * *",
		TargetEngineVersion: "1.0.0",
		Now:                 now,
	})
	require.NoError(t, err)
	gameRecord.Status = game.StatusEnrollmentOpen
	require.NoError(t, games.Save(context.Background(), gameRecord))

	return &closeFixture{
		now:       now,
		games:     games,
		invites:   invites,
		intentRec: rec,
		intents:   intents,
		game:      gameRecord,
	}
}

func (f *closeFixture) addCreatedInvite(t *testing.T, inviteID common.InviteID, inviteeUserID string) invite.Invite {
	t.Helper()
	rec, err := invite.New(invite.NewInviteInput{
		InviteID:      inviteID,
		GameID:        f.game.GameID,
		InviterUserID: closeOwnerUserID,
		InviteeUserID: inviteeUserID,
		Now:           f.now,
		ExpiresAt:     f.game.EnrollmentEndsAt,
	})
	require.NoError(t, err)
	require.NoError(t, f.invites.Save(context.Background(), rec))
	return rec
}

func (f *closeFixture) deps() shared.CloseEnrollmentDeps {
	return shared.CloseEnrollmentDeps{
		Games:   f.games,
		Invites: f.invites,
		Intents: f.intents,
		Logger:  silentLogger(),
	}
}

func TestCloseEnrollmentTransitionsGameAndExpiresInvites(t *testing.T) {
	t.Parallel()
	f := newCloseFixture(t)
	f.addCreatedInvite(t, "invite-1", "user-a")
	f.addCreatedInvite(t, "invite-2", "user-b")

	updated, err := shared.CloseEnrollment(
		context.Background(),
		f.deps(),
		f.game.GameID,
		game.TriggerManual,
		f.now.Add(time.Minute),
	)
	require.NoError(t, err)
	assert.Equal(t, game.StatusReadyToStart, updated.Status)

	first, err := f.invites.Get(context.Background(), "invite-1")
	require.NoError(t, err)
	assert.Equal(t, invite.StatusExpired, first.Status)

	second, err := f.invites.Get(context.Background(), "invite-2")
	require.NoError(t, err)
	assert.Equal(t, invite.StatusExpired, second.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{closeOwnerUserID}, intent.RecipientUserIDs)
	}
}

func TestCloseEnrollmentLeavesNonCreatedInvitesUntouched(t *testing.T) {
	t.Parallel()
	f := newCloseFixture(t)
	created := f.addCreatedInvite(t, "invite-1", "user-a")
	declined := f.addCreatedInvite(t, "invite-2", "user-b")

	require.NoError(t, f.invites.UpdateStatus(context.Background(), ports.UpdateInviteStatusInput{
		InviteID:     declined.InviteID,
		ExpectedFrom: invite.StatusCreated,
		To:           invite.StatusDeclined,
		At:           f.now,
	}))

	_, err := shared.CloseEnrollment(
		context.Background(),
		f.deps(),
		f.game.GameID,
		game.TriggerManual,
		f.now.Add(time.Minute),
	)
	require.NoError(t, err)

	createdAfter, err := f.invites.Get(context.Background(), created.InviteID)
	require.NoError(t, err)
	assert.Equal(t, invite.StatusExpired, createdAfter.Status)

	declinedAfter, err := f.invites.Get(context.Background(), declined.InviteID)
	require.NoError(t, err)
	assert.Equal(t, invite.StatusDeclined, declinedAfter.Status)

	intents := f.intentRec.snapshot()
	require.Len(t, intents, 1)
}

func TestCloseEnrollmentSurfacesGameConflict(t *testing.T) {
	t.Parallel()
	f := newCloseFixture(t)
	f.addCreatedInvite(t, "invite-1", "user-a")

	rec, err := f.games.Get(context.Background(), f.game.GameID)
	require.NoError(t, err)
	rec.Status = game.StatusDraft
	require.NoError(t, f.games.Save(context.Background(), rec))

	_, err = shared.CloseEnrollment(
		context.Background(),
		f.deps(),
		f.game.GameID,
		game.TriggerManual,
		f.now.Add(time.Minute),
	)
	require.ErrorIs(t, err, game.ErrConflict)

	stillCreated, err := f.invites.Get(context.Background(), "invite-1")
	require.NoError(t, err)
	assert.Equal(t, invite.StatusCreated, stillCreated.Status)
	assert.Empty(t, f.intentRec.snapshot())
}

func TestCloseEnrollmentSwallowsIntentPublishFailure(t *testing.T) {
	t.Parallel()
	f := newCloseFixture(t)
	f.addCreatedInvite(t, "invite-1", "user-a")
	f.intentRec.setErr(errors.New("publisher offline"))

	updated, err := shared.CloseEnrollment(
		context.Background(),
		f.deps(),
		f.game.GameID,
		game.TriggerManual,
		f.now.Add(time.Minute),
	)
	require.NoError(t, err)
	assert.Equal(t, game.StatusReadyToStart, updated.Status)

	expired, err := f.invites.Get(context.Background(), "invite-1")
	require.NoError(t, err)
	assert.Equal(t, invite.StatusExpired, expired.Status)
}

func TestCloseEnrollmentIsIdempotentOnSecondCall(t *testing.T) {
	t.Parallel()
	f := newCloseFixture(t)
	f.addCreatedInvite(t, "invite-1", "user-a")

	_, err := shared.CloseEnrollment(
		context.Background(),
		f.deps(),
		f.game.GameID,
		game.TriggerManual,
		f.now.Add(time.Minute),
	)
	require.NoError(t, err)
	assert.Len(t, f.intentRec.snapshot(), 1)

	_, err = shared.CloseEnrollment(
		context.Background(),
		f.deps(),
		f.game.GameID,
		game.TriggerManual,
		f.now.Add(2*time.Minute),
	)
	require.ErrorIs(t, err, game.ErrConflict)
	assert.Len(t, f.intentRec.snapshot(), 1)
}

func TestCloseEnrollmentRejectsUnknownTrigger(t *testing.T) {
	t.Parallel()
	f := newCloseFixture(t)

	_, err := shared.CloseEnrollment(
		context.Background(),
		f.deps(),
		f.game.GameID,
		game.Trigger("bogus"),
		f.now,
	)
	require.Error(t, err)
}