package listmygames_test

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

	"galaxy/lobby/internal/adapters/gamestub"
	"galaxy/lobby/internal/adapters/membershipstub"
	"galaxy/lobby/internal/domain/common"
	"galaxy/lobby/internal/domain/game"
	"galaxy/lobby/internal/domain/membership"
	"galaxy/lobby/internal/ports"
	"galaxy/lobby/internal/service/listmygames"
	"galaxy/lobby/internal/service/shared"

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

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

type fixture struct {
	games       *gamestub.Store
	memberships *membershipstub.Store
	svc         *listmygames.Service
}

func newFixture(t *testing.T) *fixture {
	t.Helper()
	games := gamestub.NewStore()
	memberships := membershipstub.NewStore()
	svc, err := listmygames.NewService(listmygames.Dependencies{
		Games:       games,
		Memberships: memberships,
		Logger:      silentLogger(),
	})
	require.NoError(t, err)
	return &fixture{games: games, memberships: memberships, svc: svc}
}

func seedGameWithStatus(
	t *testing.T,
	store *gamestub.Store,
	id common.GameID,
	status game.Status,
	now time.Time,
) {
	t.Helper()
	record, err := game.New(game.NewGameInput{
		GameID:              id,
		GameName:            "Seed",
		GameType:            game.GameTypePublic,
		MinPlayers:          2,
		MaxPlayers:          4,
		StartGapHours:       4,
		StartGapPlayers:     1,
		EnrollmentEndsAt:    now.Add(24 * time.Hour),
		TurnSchedule:        "0 */6 * * *",
		TargetEngineVersion: "1.0.0",
		Now:                 now,
	})
	require.NoError(t, err)
	if status != game.StatusDraft {
		record.Status = status
		record.UpdatedAt = now.Add(time.Minute)
		if status == game.StatusRunning || status == game.StatusPaused ||
			status == game.StatusFinished {
			started := now.Add(time.Minute)
			record.StartedAt = &started
		}
	}
	require.NoError(t, store.Save(context.Background(), record))
}

func seedMembership(
	t *testing.T,
	store *membershipstub.Store,
	gameID common.GameID,
	userID string,
	status membership.Status,
	joinedAt time.Time,
) {
	t.Helper()
	record, err := membership.New(membership.NewMembershipInput{
		MembershipID: common.MembershipID("membership-" + userID + "-" + gameID.String()),
		GameID:       gameID,
		UserID:       userID,
		RaceName:     "Race-" + userID,
		CanonicalKey: "race-" + userID,
		Now:          joinedAt,
	})
	require.NoError(t, err)
	require.NoError(t, store.Save(context.Background(), record))
	if status != membership.StatusActive {
		require.NoError(t, store.UpdateStatus(context.Background(), ports.UpdateMembershipStatusInput{
			MembershipID: record.MembershipID,
			ExpectedFrom: membership.StatusActive,
			To:           status,
			At:           joinedAt.Add(time.Minute),
		}))
	}
}

func TestHandleReturnsRunningAndPaused(t *testing.T) {
	t.Parallel()
	fix := newFixture(t)
	now := time.Date(2025, 6, 1, 12, 0, 0, 0, time.UTC)

	seedGameWithStatus(t, fix.games, "game-running", game.StatusRunning, now)
	seedGameWithStatus(t, fix.games, "game-paused", game.StatusPaused, now)
	seedGameWithStatus(t, fix.games, "game-finished", game.StatusFinished, now)
	seedGameWithStatus(t, fix.games, "game-enroll", game.StatusEnrollmentOpen, now)
	for _, id := range []common.GameID{"game-running", "game-paused", "game-finished", "game-enroll"} {
		seedMembership(t, fix.memberships, id, "user-1", membership.StatusActive, now)
	}

	out, err := fix.svc.Handle(context.Background(), listmygames.Input{
		Actor: shared.NewUserActor("user-1"),
	})
	require.NoError(t, err)
	require.Len(t, out.Items, 2)
	gotIDs := []common.GameID{out.Items[0].GameID, out.Items[1].GameID}
	require.Contains(t, gotIDs, common.GameID("game-running"))
	require.Contains(t, gotIDs, common.GameID("game-paused"))
}

func TestHandleIgnoresRemovedAndBlockedMemberships(t *testing.T) {
	t.Parallel()
	fix := newFixture(t)
	now := time.Date(2025, 6, 1, 12, 0, 0, 0, time.UTC)

	seedGameWithStatus(t, fix.games, "game-removed", game.StatusRunning, now)
	seedGameWithStatus(t, fix.games, "game-blocked", game.StatusRunning, now)
	seedGameWithStatus(t, fix.games, "game-active", game.StatusRunning, now)
	seedMembership(t, fix.memberships, "game-removed", "user-1", membership.StatusRemoved, now)
	seedMembership(t, fix.memberships, "game-blocked", "user-1", membership.StatusBlocked, now)
	seedMembership(t, fix.memberships, "game-active", "user-1", membership.StatusActive, now)

	out, err := fix.svc.Handle(context.Background(), listmygames.Input{
		Actor: shared.NewUserActor("user-1"),
	})
	require.NoError(t, err)
	require.Len(t, out.Items, 1)
	require.Equal(t, common.GameID("game-active"), out.Items[0].GameID)
}

func TestHandleAdminForbidden(t *testing.T) {
	t.Parallel()
	fix := newFixture(t)

	_, err := fix.svc.Handle(context.Background(), listmygames.Input{
		Actor: shared.NewAdminActor(),
	})
	require.ErrorIs(t, err, shared.ErrForbidden)
}

func TestHandlePaginationAndOrder(t *testing.T) {
	t.Parallel()
	fix := newFixture(t)
	now := time.Date(2025, 6, 1, 12, 0, 0, 0, time.UTC)

	for i := range 4 {
		id := common.GameID("game-page-" + string(rune('a'+i)))
		seedGameWithStatus(t, fix.games, id, game.StatusRunning, now.Add(time.Duration(i)*time.Minute))
		seedMembership(t, fix.memberships, id, "user-1", membership.StatusActive, now)
	}

	out, err := fix.svc.Handle(context.Background(), listmygames.Input{
		Actor: shared.NewUserActor("user-1"),
		Page:  shared.Page{Size: 2},
	})
	require.NoError(t, err)
	require.Len(t, out.Items, 2)
	require.NotEmpty(t, out.NextPageToken)

	// Most recently started first.
	require.Equal(t, common.GameID("game-page-d"), out.Items[0].GameID)
	require.Equal(t, common.GameID("game-page-c"), out.Items[1].GameID)
}

func TestNewServiceRejectsMissingDeps(t *testing.T) {
	t.Parallel()
	cases := []struct {
		name string
		deps listmygames.Dependencies
	}{
		{"nil games", listmygames.Dependencies{Memberships: membershipstub.NewStore()}},
		{"nil memberships", listmygames.Dependencies{Games: gamestub.NewStore()}},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			t.Parallel()
			_, err := listmygames.NewService(tc.deps)
			require.Error(t, err)
		})
	}
}