package errors

import (
	"errors"
	"testing"
)

func TestAppErrorErrorIncludesCodeAndMessage(t *testing.T) {
	err := &AppError{Code: "OPS_TEST", Message: "failed"}
	if got := err.Error(); got != "[OPS_TEST] failed" {
		t.Fatalf("unexpected error string: %s", got)
	}
}

func TestWithDetailReturnsCopyWithoutMutatingBase(t *testing.T) {
	detail := map[string]any{"field": "name"}
	err := ErrBadRequest.WithDetail(detail)

	if err == ErrBadRequest {
		t.Fatal("expected a copy, got original pointer")
	}
	if err.Code != ErrBadRequest.Code || err.HTTPStatus != ErrBadRequest.HTTPStatus || err.Message != ErrBadRequest.Message {
		t.Fatalf("metadata not preserved: %+v", err)
	}
	if err.Detail["field"] != "name" {
		t.Fatalf("detail not attached: %+v", err.Detail)
	}
	if ErrBadRequest.Detail != nil {
		t.Fatalf("base error was mutated: %+v", ErrBadRequest.Detail)
	}
}

func TestWrap(t *testing.T) {
	if Wrap(nil, ErrInternal) != nil {
		t.Fatal("nil input should return nil")
	}

	wrapped := Wrap(errors.New("boom"), ErrInternal)
	if wrapped.Code != ErrInternal.Code || wrapped.HTTPStatus != ErrInternal.HTTPStatus {
		t.Fatalf("metadata not preserved: %+v", wrapped)
	}
	if wrapped.Message != "内部服务错误: boom" {
		t.Fatalf("unexpected message: %s", wrapped.Message)
	}
}