package revokeinvite_test

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

	"galaxy/lobby/internal/adapters/gamestub"
	"galaxy/lobby/internal/adapters/invitestub"
	"galaxy/lobby/internal/domain/common"
	"galaxy/lobby/internal/domain/game"
	"galaxy/lobby/internal/domain/invite"
	"galaxy/lobby/internal/ports"
	"galaxy/lobby/internal/service/revokeinvite"
	"galaxy/lobby/internal/service/shared"

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

const (
	ownerUserID   = "user-owner"
	inviteeUserID = "user-invitee"
)

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   *gamestub.Store
	invites *invitestub.Store
	game    game.Game
}

func newFixture(t *testing.T) *fixture {
	t.Helper()
	now := time.Date(2026, 4, 25, 10, 0, 0, 0, time.UTC)
	games := gamestub.NewStore()
	invites := invitestub.NewStore()

	gameRecord, err := game.New(game.NewGameInput{
		GameID:              "game-private",
		GameName:            "Friends Only",
		GameType:            game.GameTypePrivate,
		OwnerUserID:         ownerUserID,
		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 &fixture{
		now:     now,
		games:   games,
		invites: invites,
		game:    gameRecord,
	}
}

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

func seedCreatedInvite(t *testing.T, f *fixture, inviteID common.InviteID, invitee string) invite.Invite {
	t.Helper()
	inv, err := invite.New(invite.NewInviteInput{
		InviteID:      inviteID,
		GameID:        f.game.GameID,
		InviterUserID: ownerUserID,
		InviteeUserID: invitee,
		Now:           f.now,
		ExpiresAt:     f.game.EnrollmentEndsAt,
	})
	require.NoError(t, err)
	require.NoError(t, f.invites.Save(context.Background(), inv))
	return inv
}

func TestRevokeHappyPath(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	inv := seedCreatedInvite(t, f, "invite-1", inviteeUserID)
	svc := newService(t, f)

	got, err := svc.Handle(context.Background(), revokeinvite.Input{
		Actor:    shared.NewUserActor(ownerUserID),
		GameID:   f.game.GameID,
		InviteID: inv.InviteID,
	})
	require.NoError(t, err)
	assert.Equal(t, invite.StatusRevoked, got.Status)
	require.NotNil(t, got.DecidedAt)
	assert.Equal(t, f.now, *got.DecidedAt)
}

func TestRevokeAdminActorForbidden(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	inv := seedCreatedInvite(t, f, "invite-1", inviteeUserID)
	svc := newService(t, f)

	_, err := svc.Handle(context.Background(), revokeinvite.Input{
		Actor:    shared.NewAdminActor(),
		GameID:   f.game.GameID,
		InviteID: inv.InviteID,
	})
	require.ErrorIs(t, err, shared.ErrForbidden)
}

func TestRevokeNonOwnerForbidden(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	inv := seedCreatedInvite(t, f, "invite-1", inviteeUserID)
	svc := newService(t, f)

	_, err := svc.Handle(context.Background(), revokeinvite.Input{
		Actor:    shared.NewUserActor("user-impostor"),
		GameID:   f.game.GameID,
		InviteID: inv.InviteID,
	})
	require.ErrorIs(t, err, shared.ErrForbidden)
}

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

	_, err := svc.Handle(context.Background(), revokeinvite.Input{
		Actor:    shared.NewUserActor(ownerUserID),
		GameID:   f.game.GameID,
		InviteID: "invite-missing",
	})
	require.ErrorIs(t, err, invite.ErrNotFound)
}

func TestRevokeCrossGameNotFound(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	inv := seedCreatedInvite(t, f, "invite-1", inviteeUserID)
	svc := newService(t, f)

	_, err := svc.Handle(context.Background(), revokeinvite.Input{
		Actor:    shared.NewUserActor(ownerUserID),
		GameID:   "game-other",
		InviteID: inv.InviteID,
	})
	require.ErrorIs(t, err, invite.ErrNotFound)
}

func TestRevokeWrongStatusConflict(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	inv := seedCreatedInvite(t, f, "invite-1", inviteeUserID)
	require.NoError(t, f.invites.UpdateStatus(context.Background(), ports.UpdateInviteStatusInput{
		InviteID:     inv.InviteID,
		ExpectedFrom: invite.StatusCreated,
		To:           invite.StatusDeclined,
		At:           f.now,
	}))
	svc := newService(t, f)

	_, err := svc.Handle(context.Background(), revokeinvite.Input{
		Actor:    shared.NewUserActor(ownerUserID),
		GameID:   f.game.GameID,
		InviteID: inv.InviteID,
	})
	require.ErrorIs(t, err, invite.ErrConflict)
}

func TestRevokeGameNotFound(t *testing.T) {
	t.Parallel()
	f := newFixture(t)
	inv := seedCreatedInvite(t, f, "invite-1", inviteeUserID)
	// Re-wire the service against a fresh empty games store so the
	// owner-check load fails. The invite remains addressable; the missing
	// game path is a defensive guard, but the surfaced error must be
	// subject_not_found rather than forbidden.
	svc, err := revokeinvite.NewService(revokeinvite.Dependencies{
		Games:   gamestub.NewStore(),
		Invites: f.invites,
		Clock:   fixedClock(f.now),
		Logger:  silentLogger(),
	})
	require.NoError(t, err)

	_, err = svc.Handle(context.Background(), revokeinvite.Input{
		Actor:    shared.NewUserActor(ownerUserID),
		GameID:   f.game.GameID,
		InviteID: inv.InviteID,
	})
	require.ErrorIs(t, err, game.ErrNotFound)
}