package applicationstore_test

import (
	"context"
	"testing"
	"time"

	"galaxy/lobby/internal/adapters/postgres/applicationstore"
	"galaxy/lobby/internal/adapters/postgres/gamestore"
	"galaxy/lobby/internal/adapters/postgres/internal/pgtest"
	"galaxy/lobby/internal/domain/application"
	"galaxy/lobby/internal/domain/common"
	"galaxy/lobby/internal/domain/game"
	"galaxy/lobby/internal/ports"

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

func TestMain(m *testing.M) { pgtest.RunMain(m) }

func newStores(t *testing.T) (*gamestore.Store, *applicationstore.Store) {
	t.Helper()
	pgtest.TruncateAll(t)
	gs, err := gamestore.New(gamestore.Config{
		DB: pgtest.Ensure(t).Pool(), OperationTimeout: pgtest.OperationTimeout,
	})
	require.NoError(t, err)
	as, err := applicationstore.New(applicationstore.Config{
		DB: pgtest.Ensure(t).Pool(), OperationTimeout: pgtest.OperationTimeout,
	})
	require.NoError(t, err)
	return gs, as
}

func seedGame(t *testing.T, gs *gamestore.Store, id string) game.Game {
	t.Helper()
	now := time.Date(2026, 4, 23, 12, 0, 0, 0, time.UTC)
	g, err := game.New(game.NewGameInput{
		GameID:              common.GameID(id),
		GameName:            "Game " + id,
		GameType:            game.GameTypePublic,
		MinPlayers:          2,
		MaxPlayers:          8,
		StartGapHours:       12,
		StartGapPlayers:     2,
		EnrollmentEndsAt:    now.Add(7 * 24 * time.Hour),
		TurnSchedule:        "0 18 * * *",
		TargetEngineVersion: "v1.0.0",
		Now:                 now,
	})
	require.NoError(t, err)
	require.NoError(t, gs.Save(context.Background(), g))
	return g
}

func newApplication(t *testing.T, id, gameID, userID string) application.Application {
	t.Helper()
	a, err := application.New(application.NewApplicationInput{
		ApplicationID:   common.ApplicationID(id),
		GameID:          common.GameID(gameID),
		ApplicantUserID: userID,
		RaceName:        "Pilot " + id,
		Now:             time.Date(2026, 4, 23, 12, 0, 0, 0, time.UTC),
	})
	require.NoError(t, err)
	return a
}

func TestSaveAndGet(t *testing.T) {
	ctx := context.Background()
	gs, as := newStores(t)
	seedGame(t, gs, "game-001")

	rec := newApplication(t, "application-001", "game-001", "user-a")
	require.NoError(t, as.Save(ctx, rec))

	got, err := as.Get(ctx, rec.ApplicationID)
	require.NoError(t, err)
	assert.Equal(t, rec.ApplicationID, got.ApplicationID)
	assert.Equal(t, application.StatusSubmitted, got.Status)
	assert.Equal(t, "user-a", got.ApplicantUserID)
	assert.Nil(t, got.DecidedAt)
}

func TestSaveRejectsNonSubmittedRecord(t *testing.T) {
	ctx := context.Background()
	gs, as := newStores(t)
	seedGame(t, gs, "game-001")

	rec := newApplication(t, "application-001", "game-001", "user-a")
	rec.Status = application.StatusApproved
	require.Error(t, as.Save(ctx, rec))
}

func TestSavePartialUniqueRejectsSecondActiveForSameUserGame(t *testing.T) {
	ctx := context.Background()
	gs, as := newStores(t)
	seedGame(t, gs, "game-001")

	a1 := newApplication(t, "application-001", "game-001", "user-a")
	require.NoError(t, as.Save(ctx, a1))

	// second submission by the same user against the same game must fail.
	a2 := newApplication(t, "application-002", "game-001", "user-a")
	err := as.Save(ctx, a2)
	require.ErrorIs(t, err, application.ErrConflict)
}

func TestSavePartialUniqueAllowsResubmitAfterRejection(t *testing.T) {
	ctx := context.Background()
	gs, as := newStores(t)
	seedGame(t, gs, "game-001")

	a1 := newApplication(t, "application-001", "game-001", "user-a")
	require.NoError(t, as.Save(ctx, a1))

	require.NoError(t, as.UpdateStatus(ctx, ports.UpdateApplicationStatusInput{
		ApplicationID: a1.ApplicationID,
		ExpectedFrom:  application.StatusSubmitted,
		To:            application.StatusRejected,
		At:            a1.CreatedAt.Add(time.Minute),
	}))

	// after rejection a new submission for the same (user, game) is allowed.
	a2 := newApplication(t, "application-002", "game-001", "user-a")
	require.NoError(t, as.Save(ctx, a2))
}

func TestUpdateStatusReturnsConflictOnExpectedFromMismatch(t *testing.T) {
	ctx := context.Background()
	gs, as := newStores(t)
	seedGame(t, gs, "game-001")

	rec := newApplication(t, "application-001", "game-001", "user-a")
	require.NoError(t, as.Save(ctx, rec))

	// First, transition the row to approved.
	require.NoError(t, as.UpdateStatus(ctx, ports.UpdateApplicationStatusInput{
		ApplicationID: rec.ApplicationID,
		ExpectedFrom:  application.StatusSubmitted,
		To:            application.StatusApproved,
		At:            rec.CreatedAt.Add(time.Minute),
	}))

	// Second attempt claims status is still submitted: (submitted, rejected)
	// is a valid domain transition, but the row is already approved, so the
	// adapter must surface ErrConflict on the row-level mismatch.
	err := as.UpdateStatus(ctx, ports.UpdateApplicationStatusInput{
		ApplicationID: rec.ApplicationID,
		ExpectedFrom:  application.StatusSubmitted,
		To:            application.StatusRejected,
		At:            rec.CreatedAt.Add(2 * time.Minute),
	})
	require.ErrorIs(t, err, application.ErrConflict)
}

func TestUpdateStatusReturnsNotFoundForMissing(t *testing.T) {
	ctx := context.Background()
	_, as := newStores(t)
	err := as.UpdateStatus(ctx, ports.UpdateApplicationStatusInput{
		ApplicationID: common.ApplicationID("application-missing"),
		ExpectedFrom:  application.StatusSubmitted,
		To:            application.StatusApproved,
		At:            time.Now().UTC(),
	})
	require.ErrorIs(t, err, application.ErrNotFound)
}

func TestGetByGameAndGetByUser(t *testing.T) {
	ctx := context.Background()
	gs, as := newStores(t)
	seedGame(t, gs, "game-001")
	seedGame(t, gs, "game-002")

	require.NoError(t, as.Save(ctx, newApplication(t, "application-001", "game-001", "user-a")))
	require.NoError(t, as.Save(ctx, newApplication(t, "application-002", "game-001", "user-b")))
	require.NoError(t, as.Save(ctx, newApplication(t, "application-003", "game-002", "user-a")))

	g1, err := as.GetByGame(ctx, common.GameID("game-001"))
	require.NoError(t, err)
	assert.Len(t, g1, 2)

	userA, err := as.GetByUser(ctx, "user-a")
	require.NoError(t, err)
	assert.Len(t, userA, 2)
}

func TestGetMissingReturnsNotFound(t *testing.T) {
	ctx := context.Background()
	_, as := newStores(t)
	_, err := as.Get(ctx, common.ApplicationID("application-missing"))
	require.ErrorIs(t, err, application.ErrNotFound)
}