package memory

import (
	"context"
	"testing"

	"git.threesix.ai/jordan/slate-v3-1770514618/services/preferences-api/internal/domain"
)

func TestPreferencesRepository_GetMissing(t *testing.T) {
	repo := NewPreferencesRepository()
	_, err := repo.Get(context.Background(), "nonexistent")
	if err != domain.ErrPreferencesNotFound {
		t.Errorf("expected ErrPreferencesNotFound, got %v", err)
	}
}

func TestPreferencesRepository_UpsertAndGet(t *testing.T) {
	repo := NewPreferencesRepository()
	ctx := context.Background()

	prefs := domain.NewDefaultPreferences("user-1")
	prefs.Theme = "dark"

	if err := repo.Upsert(ctx, "user-1", prefs); err != nil {
		t.Fatalf("unexpected error on upsert: %v", err)
	}

	got, err := repo.Get(ctx, "user-1")
	if err != nil {
		t.Fatalf("unexpected error on get: %v", err)
	}
	if got.Theme != "dark" {
		t.Errorf("expected theme 'dark', got '%s'", got.Theme)
	}
	if got.UserID != "user-1" {
		t.Errorf("expected user_id 'user-1', got '%s'", got.UserID)
	}
}

func TestPreferencesRepository_UpsertOverwrites(t *testing.T) {
	repo := NewPreferencesRepository()
	ctx := context.Background()

	prefs1 := domain.NewDefaultPreferences("user-1")
	prefs1.Theme = "dark"
	_ = repo.Upsert(ctx, "user-1", prefs1)

	prefs2 := domain.NewDefaultPreferences("user-1")
	prefs2.Theme = "light"
	_ = repo.Upsert(ctx, "user-1", prefs2)

	got, _ := repo.Get(ctx, "user-1")
	if got.Theme != "light" {
		t.Errorf("expected theme 'light' after overwrite, got '%s'", got.Theme)
	}
}

func TestPreferencesRepository_ReturnsCopy(t *testing.T) {
	repo := NewPreferencesRepository()
	ctx := context.Background()

	prefs := domain.NewDefaultPreferences("user-1")
	_ = repo.Upsert(ctx, "user-1", prefs)

	got, _ := repo.Get(ctx, "user-1")
	got.Theme = "modified"

	got2, _ := repo.Get(ctx, "user-1")
	if got2.Theme != "system" {
		t.Errorf("expected stored theme 'system' unchanged, got '%s'", got2.Theme)
	}
}