package listmyapplications_test

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

	"galaxy/lobby/internal/adapters/applicationstub"
	"galaxy/lobby/internal/adapters/gamestub"
	"galaxy/lobby/internal/domain/application"
	"galaxy/lobby/internal/domain/common"
	"galaxy/lobby/internal/domain/game"
	"galaxy/lobby/internal/ports"
	"galaxy/lobby/internal/service/listmyapplications"
	"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
	applications *applicationstub.Store
	svc          *listmyapplications.Service
}

func newFixture(t *testing.T) *fixture {
	t.Helper()
	games := gamestub.NewStore()
	apps := applicationstub.NewStore()
	svc, err := listmyapplications.NewService(listmyapplications.Dependencies{
		Games:        games,
		Applications: apps,
		Logger:       silentLogger(),
	})
	require.NoError(t, err)
	return &fixture{games: games, applications: apps, svc: svc}
}

func seedGame(
	t *testing.T,
	store *gamestub.Store,
	id common.GameID,
	gameType game.GameType,
	name string,
	now time.Time,
) {
	t.Helper()
	owner := ""
	if gameType == game.GameTypePrivate {
		owner = "user-owner"
	}
	record, err := game.New(game.NewGameInput{
		GameID:              id,
		GameName:            name,
		GameType:            gameType,
		OwnerUserID:         owner,
		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)
	require.NoError(t, store.Save(context.Background(), record))
}

func seedApplication(
	t *testing.T,
	store *applicationstub.Store,
	id common.ApplicationID,
	gameID common.GameID,
	userID string,
	status application.Status,
	createdAt time.Time,
) {
	t.Helper()
	record, err := application.New(application.NewApplicationInput{
		ApplicationID:   id,
		GameID:          gameID,
		ApplicantUserID: userID,
		RaceName:        "Race-" + userID,
		Now:             createdAt,
	})
	require.NoError(t, err)
	require.NoError(t, store.Save(context.Background(), record))
	if status != application.StatusSubmitted {
		require.NoError(t, store.UpdateStatus(context.Background(), ports.UpdateApplicationStatusInput{
			ApplicationID: id,
			ExpectedFrom:  application.StatusSubmitted,
			To:            status,
			At:            createdAt.Add(time.Minute),
		}))
	}
}

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

	seedGame(t, fix.games, "game-1", game.GameTypePublic, "Hyperion", now)
	seedGame(t, fix.games, "game-2", game.GameTypePublic, "Endymion", now)
	seedApplication(t, fix.applications, "application-submitted", "game-1", "user-1", application.StatusSubmitted, now)
	seedApplication(t, fix.applications, "application-rejected", "game-2", "user-1", application.StatusRejected, now)

	out, err := fix.svc.Handle(context.Background(), listmyapplications.Input{
		Actor: shared.NewUserActor("user-1"),
	})
	require.NoError(t, err)
	require.Len(t, out.Items, 1)
	require.Equal(t, common.ApplicationID("application-submitted"), out.Items[0].Application.ApplicationID)
	require.Equal(t, "Hyperion", out.Items[0].GameName)
	require.Equal(t, game.GameTypePublic, out.Items[0].GameType)
}

func TestHandleAdminForbidden(t *testing.T) {
	t.Parallel()
	fix := newFixture(t)
	_, err := fix.svc.Handle(context.Background(), listmyapplications.Input{
		Actor: shared.NewAdminActor(),
	})
	require.ErrorIs(t, err, shared.ErrForbidden)
}

func TestHandleSkipsApplicationsWithMissingGame(t *testing.T) {
	t.Parallel()
	fix := newFixture(t)
	now := time.Date(2025, 6, 1, 12, 0, 0, 0, time.UTC)
	// Note: seed only application-1's game; application-2 will reference a missing game.
	seedGame(t, fix.games, "game-1", game.GameTypePublic, "G1", now)
	seedApplication(t, fix.applications, "application-1", "game-1", "user-1", application.StatusSubmitted, now)
	seedApplication(t, fix.applications, "application-2", "game-missing", "user-1", application.StatusSubmitted, now)

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

func TestHandlePagination(t *testing.T) {
	t.Parallel()
	fix := newFixture(t)
	now := time.Date(2025, 6, 1, 12, 0, 0, 0, time.UTC)
	for i := range 4 {
		gid := common.GameID("game-page-" + string(rune('a'+i)))
		seedGame(t, fix.games, gid, game.GameTypePublic, "G", now)
		seedApplication(t, fix.applications,
			common.ApplicationID("application-page-"+string(rune('a'+i))),
			gid, "user-1", application.StatusSubmitted,
			now.Add(time.Duration(i)*time.Minute),
		)
	}

	first, err := fix.svc.Handle(context.Background(), listmyapplications.Input{
		Actor: shared.NewUserActor("user-1"),
		Page:  shared.Page{Size: 2},
	})
	require.NoError(t, err)
	require.Len(t, first.Items, 2)
	require.NotEmpty(t, first.NextPageToken)
	// Most recent first.
	require.Equal(t, common.ApplicationID("application-page-d"), first.Items[0].Application.ApplicationID)
	require.Equal(t, common.ApplicationID("application-page-c"), first.Items[1].Application.ApplicationID)
}

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