package rejectapplication_test

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

	"galaxy/lobby/internal/adapters/applicationinmem"
	"galaxy/lobby/internal/adapters/gameinmem"
	"galaxy/lobby/internal/adapters/mocks"
	"galaxy/lobby/internal/adapters/racenameinmem"
	"galaxy/lobby/internal/domain/application"
	"galaxy/lobby/internal/domain/common"
	"galaxy/lobby/internal/domain/game"
	"galaxy/lobby/internal/ports"
	"galaxy/lobby/internal/service/rejectapplication"
	"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
	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
}

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
	applications     *applicationinmem.Store
	directory        *racenameinmem.Directory
	intentRec        *intentRec
	intents          *mocks.MockIntentPublisher
	openPublicGameID common.GameID
}

func newFixture(t *testing.T) *fixture {
	t.Helper()
	now := time.Date(2026, 4, 25, 10, 0, 0, 0, time.UTC)
	dir, err := racenameinmem.NewDirectory(racenameinmem.WithClock(fixedClock(now)))
	require.NoError(t, err)
	games := gameinmem.NewStore()
	applications := applicationinmem.NewStore()

	gameRecord, err := game.New(game.NewGameInput{
		GameID:              "game-public",
		GameName:            "Galactic Open",
		GameType:            game.GameTypePublic,
		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))

	rec := &intentRec{}
	return &fixture{
		now:              now,
		games:            games,
		applications:     applications,
		directory:        dir,
		intentRec:        rec,
		openPublicGameID: gameRecord.GameID,
	}
}

func newService(t *testing.T, f *fixture) *rejectapplication.Service {
	t.Helper()
	if f.intents == nil {
		f.intents = newIntentMock(t, f.intentRec)
	}
	svc, err := rejectapplication.NewService(rejectapplication.Dependencies{
		Games:        f.games,
		Applications: f.applications,
		Directory:    f.directory,
		Intents:      f.intents,
		Clock:        fixedClock(f.now),
		Logger:       silentLogger(),
	})
	require.NoError(t, err)
	return svc
}

func seedSubmittedApplication(t *testing.T, f *fixture, applicationID common.ApplicationID, userID, raceName string) application.Application {
	t.Helper()
	app, err := application.New(application.NewApplicationInput{
		ApplicationID:   applicationID,
		GameID:          f.openPublicGameID,
		ApplicantUserID: userID,
		RaceName:        raceName,
		Now:             f.now,
	})
	require.NoError(t, err)
	require.NoError(t, f.applications.Save(context.Background(), app))
	return app
}

func TestRejectHappyPath(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	app := seedSubmittedApplication(t, f, "application-1", "user-1", "SolarPilot")
	svc := newService(t, f)

	got, err := svc.Handle(context.Background(), rejectapplication.Input{
		Actor:         shared.NewAdminActor(),
		GameID:        f.openPublicGameID,
		ApplicationID: app.ApplicationID,
	})
	require.NoError(t, err)
	assert.Equal(t, application.StatusRejected, got.Status)
	require.NotNil(t, got.DecidedAt)
	assert.Equal(t, f.now, got.DecidedAt.UTC())

	intents := f.intentRec.snapshot()
	require.Len(t, intents, 1)
	assert.Equal(t, notificationintent.NotificationTypeLobbyMembershipRejected, intents[0].NotificationType)
	assert.Equal(t, []string{"user-1"}, intents[0].RecipientUserIDs)
}

func TestRejectReleasesPriorReservation(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	app := seedSubmittedApplication(t, f, "application-1", "user-1", "SolarPilot")

	require.NoError(t, f.directory.Reserve(context.Background(), f.openPublicGameID.String(), "user-1", "SolarPilot"))

	svc := newService(t, f)
	_, err := svc.Handle(context.Background(), rejectapplication.Input{
		Actor:         shared.NewAdminActor(),
		GameID:        f.openPublicGameID,
		ApplicationID: app.ApplicationID,
	})
	require.NoError(t, err)

	availability, err := f.directory.Check(context.Background(), "SolarPilot", "user-other")
	require.NoError(t, err)
	assert.False(t, availability.Taken)
	assert.Empty(t, availability.HolderUserID)
}

func TestRejectUserActorForbidden(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	app := seedSubmittedApplication(t, f, "application-1", "user-1", "SolarPilot")
	svc := newService(t, f)

	_, err := svc.Handle(context.Background(), rejectapplication.Input{
		Actor:         shared.NewUserActor("user-1"),
		GameID:        f.openPublicGameID,
		ApplicationID: app.ApplicationID,
	})
	require.ErrorIs(t, err, shared.ErrForbidden)
}

func TestRejectNotFound(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	svc := newService(t, f)

	_, err := svc.Handle(context.Background(), rejectapplication.Input{
		Actor:         shared.NewAdminActor(),
		GameID:        f.openPublicGameID,
		ApplicationID: "application-missing",
	})
	require.ErrorIs(t, err, application.ErrNotFound)
}

func TestRejectCrossGameNotFound(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	app := seedSubmittedApplication(t, f, "application-1", "user-1", "SolarPilot")
	svc := newService(t, f)

	_, err := svc.Handle(context.Background(), rejectapplication.Input{
		Actor:         shared.NewAdminActor(),
		GameID:        "game-other",
		ApplicationID: app.ApplicationID,
	})
	require.ErrorIs(t, err, application.ErrNotFound)
}

func TestRejectAlreadyDecidedConflict(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	app := seedSubmittedApplication(t, f, "application-1", "user-1", "SolarPilot")
	require.NoError(t, f.applications.UpdateStatus(context.Background(), ports.UpdateApplicationStatusInput{
		ApplicationID: app.ApplicationID,
		ExpectedFrom:  application.StatusSubmitted,
		To:            application.StatusApproved,
		At:            f.now,
	}))

	svc := newService(t, f)
	_, err := svc.Handle(context.Background(), rejectapplication.Input{
		Actor:         shared.NewAdminActor(),
		GameID:        f.openPublicGameID,
		ApplicationID: app.ApplicationID,
	})
	require.ErrorIs(t, err, application.ErrConflict)
}

func TestRejectPublishFailureDoesNotRollback(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	app := seedSubmittedApplication(t, f, "application-1", "user-1", "SolarPilot")
	f.intentRec.setErr(errors.New("publish failed"))

	svc := newService(t, f)
	got, err := svc.Handle(context.Background(), rejectapplication.Input{
		Actor:         shared.NewAdminActor(),
		GameID:        f.openPublicGameID,
		ApplicationID: app.ApplicationID,
	})
	require.NoError(t, err)
	assert.Equal(t, application.StatusRejected, got.Status)

	stored, err := f.applications.Get(context.Background(), app.ApplicationID)
	require.NoError(t, err)
	assert.Equal(t, application.StatusRejected, stored.Status)
}