package declineinvite_test

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

	"galaxy/lobby/internal/adapters/invitestub"
	"galaxy/lobby/internal/domain/common"
	"galaxy/lobby/internal/domain/invite"
	"galaxy/lobby/internal/ports"
	"galaxy/lobby/internal/service/declineinvite"
	"galaxy/lobby/internal/service/shared"

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

const (
	gameID        = common.GameID("game-private")
	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
	invites *invitestub.Store
}

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

func newService(t *testing.T, f *fixture) *declineinvite.Service {
	t.Helper()
	svc, err := declineinvite.NewService(declineinvite.Dependencies{
		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:        gameID,
		InviterUserID: ownerUserID,
		InviteeUserID: invitee,
		Now:           f.now,
		ExpiresAt:     f.now.Add(24 * time.Hour),
	})
	require.NoError(t, err)
	require.NoError(t, f.invites.Save(context.Background(), inv))
	return inv
}

func TestDeclineHappyPath(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(), declineinvite.Input{
		Actor:    shared.NewUserActor(inviteeUserID),
		GameID:   gameID,
		InviteID: inv.InviteID,
	})
	require.NoError(t, err)
	assert.Equal(t, invite.StatusDeclined, got.Status)
	require.NotNil(t, got.DecidedAt)
	assert.Equal(t, f.now, *got.DecidedAt)
}

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

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

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

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

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

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

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

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

func TestDeclineWrongStatusConflict(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.StatusRevoked,
		At:           f.now,
	}))
	svc := newService(t, f)

	_, err := svc.Handle(context.Background(), declineinvite.Input{
		Actor:    shared.NewUserActor(inviteeUserID),
		GameID:   gameID,
		InviteID: inv.InviteID,
	})
	require.ErrorIs(t, err, invite.ErrConflict)
}