// InMemoryStore 的單元測試（DB-on FK 收尾，問題 #1）。
//
// 不帶 build tag：屬於預設 `go test ./...` 範圍（無需 Docker）。
// 驗證 Upsert / Get 的核心語意，並與 postgres_store_db_test.go 的 dbtest 對齊行為。
package user

import (
	"context"
	"testing"

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

func TestInMemoryStore_UpsertAndGet(t *testing.T) {
	ctx := context.Background()
	s := NewInMemoryStore()

	in := &User{ID: "sub-001", Email: "alice@example.com", Name: "Alice", Roles: []string{"admin"}}
	require.NoError(t, s.Upsert(ctx, in))

	got, err := s.Get(ctx, "sub-001")
	require.NoError(t, err)
	assert.Equal(t, "sub-001", got.ID)
	assert.Equal(t, "alice@example.com", got.Email)
	assert.Equal(t, "Alice", got.Name)
	assert.Equal(t, []string{"admin"}, got.Roles)
	assert.False(t, got.CreatedAt.IsZero(), "CreatedAt 應自動填入")
	assert.False(t, got.UpdatedAt.IsZero(), "UpdatedAt 應自動填入")
}

func TestInMemoryStore_Upsert_UpdatesAndPreservesCreatedAt(t *testing.T) {
	ctx := context.Background()
	s := NewInMemoryStore()

	require.NoError(t, s.Upsert(ctx, &User{ID: "sub-002", Email: "old@example.com", Name: "Old"}))
	first, err := s.Get(ctx, "sub-002")
	require.NoError(t, err)
	origCreated := first.CreatedAt

	// 同 ID 再 upsert：更新 email/name，保留 created_at。
	require.NoError(t, s.Upsert(ctx, &User{ID: "sub-002", Email: "new@example.com", Name: "New"}))
	second, err := s.Get(ctx, "sub-002")
	require.NoError(t, err)

	assert.Equal(t, "new@example.com", second.Email, "email 應更新")
	assert.Equal(t, "New", second.Name, "name 應更新")
	assert.Equal(t, origCreated, second.CreatedAt, "created_at 應保留")
}

func TestInMemoryStore_Get_NotFound(t *testing.T) {
	ctx := context.Background()
	s := NewInMemoryStore()

	_, err := s.Get(ctx, "nope")
	assert.ErrorIs(t, err, ErrNotFound)
}

func TestInMemoryStore_Upsert_RequiresIDAndEmail(t *testing.T) {
	ctx := context.Background()
	s := NewInMemoryStore()

	assert.Error(t, s.Upsert(ctx, &User{ID: "", Email: "x@y.z"}), "缺 ID 應回錯")
	assert.Error(t, s.Upsert(ctx, &User{ID: "sub", Email: ""}), "缺 email 應回錯（users.email NOT NULL）")
	assert.Error(t, s.Upsert(ctx, nil), "nil 應回錯")
}

// TestInMemoryStore_Upsert_RolesCopied 確認 Upsert/Get 對 roles 做 copy，
// 外部後續修改傳入 slice 不影響 store 內容（對齊 in-memory copy 語意）。
func TestInMemoryStore_Upsert_RolesCopied(t *testing.T) {
	ctx := context.Background()
	s := NewInMemoryStore()

	roles := []string{"a", "b"}
	require.NoError(t, s.Upsert(ctx, &User{ID: "sub-003", Email: "c@d.e", Roles: roles}))
	roles[0] = "MUTATED" // 外部改傳入 slice

	got, err := s.Get(ctx, "sub-003")
	require.NoError(t, err)
	assert.Equal(t, []string{"a", "b"}, got.Roles, "store 內 roles 不應被外部 mutation 影響")
}