package playermappingstore_test

import (
	"context"
	"errors"
	"testing"
	"time"

	"galaxy/gamemaster/internal/adapters/postgres/internal/pgtest"
	"galaxy/gamemaster/internal/adapters/postgres/playermappingstore"
	"galaxy/gamemaster/internal/domain/playermapping"

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

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

func newStore(t *testing.T) *playermappingstore.Store {
	t.Helper()
	pgtest.TruncateAll(t)
	store, err := playermappingstore.New(playermappingstore.Config{
		DB:               pgtest.Ensure(t).Pool(),
		OperationTimeout: pgtest.OperationTimeout,
	})
	require.NoError(t, err)
	return store
}

func mapping(gameID, userID, raceName, uuid string, createdAt time.Time) playermapping.PlayerMapping {
	return playermapping.PlayerMapping{
		GameID:           gameID,
		UserID:           userID,
		RaceName:         raceName,
		EnginePlayerUUID: uuid,
		CreatedAt:        createdAt,
	}
}

func TestNewRejectsInvalidConfig(t *testing.T) {
	_, err := playermappingstore.New(playermappingstore.Config{})
	require.Error(t, err)

	store, err := playermappingstore.New(playermappingstore.Config{
		DB:               pgtest.Ensure(t).Pool(),
		OperationTimeout: 0,
	})
	require.Error(t, err)
	require.Nil(t, store)
}

func TestBulkInsertHappy(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	now := time.Date(2026, time.April, 27, 12, 0, 0, 0, time.UTC)
	records := []playermapping.PlayerMapping{
		mapping("game-001", "user-1", "Aelinari", "uuid-1", now),
		mapping("game-001", "user-2", "Drazi", "uuid-2", now),
		mapping("game-001", "user-3", "Voltori", "uuid-3", now),
	}
	require.NoError(t, store.BulkInsert(ctx, records))

	for _, want := range records {
		got, err := store.Get(ctx, want.GameID, want.UserID)
		require.NoError(t, err)
		assert.Equal(t, want.RaceName, got.RaceName)
		assert.Equal(t, want.EnginePlayerUUID, got.EnginePlayerUUID)
		assert.True(t, got.CreatedAt.Equal(now))
		assert.Equal(t, time.UTC, got.CreatedAt.Location())
	}
}

func TestBulkInsertEmpty(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)
	require.NoError(t, store.BulkInsert(ctx, nil))
	require.NoError(t, store.BulkInsert(ctx, []playermapping.PlayerMapping{}))

	got, err := store.ListByGame(ctx, "game-001")
	require.NoError(t, err)
	assert.Empty(t, got)
}

func TestBulkInsertAtomicConflictRaceName(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	now := time.Date(2026, time.April, 27, 12, 0, 0, 0, time.UTC)
	// user-2 reuses Aelinari (already taken by user-1) inside the same
	// game — the unique (game_id, race_name) index must reject the
	// whole batch.
	records := []playermapping.PlayerMapping{
		mapping("game-001", "user-1", "Aelinari", "uuid-1", now),
		mapping("game-001", "user-2", "Drazi", "uuid-2", now),
		mapping("game-001", "user-3", "Aelinari", "uuid-3", now),
	}
	err := store.BulkInsert(ctx, records)
	require.Error(t, err)
	require.True(t, errors.Is(err, playermapping.ErrConflict), "want ErrConflict, got %v", err)

	got, err := store.ListByGame(ctx, "game-001")
	require.NoError(t, err)
	assert.Empty(t, got, "atomic batch must roll back every row when any row fails")
}

func TestBulkInsertAtomicConflictUserID(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	now := time.Date(2026, time.April, 27, 12, 0, 0, 0, time.UTC)
	records := []playermapping.PlayerMapping{
		mapping("game-001", "user-1", "Aelinari", "uuid-1", now),
		mapping("game-001", "user-1", "Drazi", "uuid-2", now), // user-1 twice
	}
	err := store.BulkInsert(ctx, records)
	require.Error(t, err)
	require.True(t, errors.Is(err, playermapping.ErrConflict))
}

func TestBulkInsertConflictAcrossCalls(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	now := time.Date(2026, time.April, 27, 12, 0, 0, 0, time.UTC)
	require.NoError(t, store.BulkInsert(ctx, []playermapping.PlayerMapping{
		mapping("game-001", "user-1", "Aelinari", "uuid-1", now),
	}))

	err := store.BulkInsert(ctx, []playermapping.PlayerMapping{
		mapping("game-001", "user-1", "DifferentRace", "uuid-2", now),
	})
	require.Error(t, err)
	require.True(t, errors.Is(err, playermapping.ErrConflict))
}

func TestBulkInsertRejectsInvalid(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	now := time.Date(2026, time.April, 27, 12, 0, 0, 0, time.UTC)
	bad := []playermapping.PlayerMapping{
		mapping("game-001", "user-1", "Aelinari", "uuid-1", now),
		{GameID: "game-001", UserID: "", RaceName: "Drazi", EnginePlayerUUID: "uuid-2", CreatedAt: now},
	}
	err := store.BulkInsert(ctx, bad)
	require.Error(t, err)
	require.False(t, errors.Is(err, playermapping.ErrConflict))

	got, err := store.ListByGame(ctx, "game-001")
	require.NoError(t, err)
	assert.Empty(t, got, "validation rejection must not insert any row")
}

func TestGetMissingReturnsNotFound(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	_, err := store.Get(ctx, "game-001", "user-1")
	require.Error(t, err)
	require.True(t, errors.Is(err, playermapping.ErrNotFound))
}

func TestGetByRace(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	now := time.Date(2026, time.April, 27, 12, 0, 0, 0, time.UTC)
	require.NoError(t, store.BulkInsert(ctx, []playermapping.PlayerMapping{
		mapping("game-001", "user-1", "Aelinari", "uuid-1", now),
		mapping("game-001", "user-2", "Drazi", "uuid-2", now),
	}))

	got, err := store.GetByRace(ctx, "game-001", "Aelinari")
	require.NoError(t, err)
	assert.Equal(t, "user-1", got.UserID)

	_, err = store.GetByRace(ctx, "game-001", "Voltori")
	require.Error(t, err)
	require.True(t, errors.Is(err, playermapping.ErrNotFound))
}

func TestListByGameSortedByUserID(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	now := time.Date(2026, time.April, 27, 12, 0, 0, 0, time.UTC)
	require.NoError(t, store.BulkInsert(ctx, []playermapping.PlayerMapping{
		mapping("game-001", "user-c", "Aelinari", "uuid-1", now),
		mapping("game-001", "user-a", "Drazi", "uuid-2", now),
		mapping("game-001", "user-b", "Voltori", "uuid-3", now),
		// other game's mappings must not leak
		mapping("game-002", "user-z", "Outsider", "uuid-4", now),
	}))

	got, err := store.ListByGame(ctx, "game-001")
	require.NoError(t, err)
	require.Len(t, got, 3)
	assert.Equal(t, "user-a", got[0].UserID)
	assert.Equal(t, "user-b", got[1].UserID)
	assert.Equal(t, "user-c", got[2].UserID)
}

func TestListByGameUnknown(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	got, err := store.ListByGame(ctx, "unknown-game")
	require.NoError(t, err)
	assert.Empty(t, got)
}

func TestDeleteByGameIdempotent(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	now := time.Date(2026, time.April, 27, 12, 0, 0, 0, time.UTC)
	require.NoError(t, store.BulkInsert(ctx, []playermapping.PlayerMapping{
		mapping("game-001", "user-1", "Aelinari", "uuid-1", now),
		mapping("game-001", "user-2", "Drazi", "uuid-2", now),
	}))

	require.NoError(t, store.DeleteByGame(ctx, "game-001"))
	got, err := store.ListByGame(ctx, "game-001")
	require.NoError(t, err)
	assert.Empty(t, got)

	// Second call must be a no-op.
	require.NoError(t, store.DeleteByGame(ctx, "game-001"))
}

func TestGetRejectsEmptyArgs(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	_, err := store.Get(ctx, "", "user-1")
	require.Error(t, err)
	_, err = store.Get(ctx, "game-001", "")
	require.Error(t, err)
}

func TestGetByRaceRejectsEmptyArgs(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)

	_, err := store.GetByRace(ctx, "", "Aelinari")
	require.Error(t, err)
	_, err = store.GetByRace(ctx, "game-001", "")
	require.Error(t, err)
}

func TestListByGameRejectsEmpty(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)
	_, err := store.ListByGame(ctx, "")
	require.Error(t, err)
}

func TestDeleteByGameRejectsEmpty(t *testing.T) {
	ctx := context.Background()
	store := newStore(t)
	err := store.DeleteByGame(ctx, "")
	require.Error(t, err)
}