package handlers

import (
	"encoding/json"
	"net/http/httptest"
	"testing"
)

// TestRespondErrorProducesValidJSON 错误信息含引号/换行时输出仍须是合法 JSON
func TestRespondErrorProducesValidJSON(t *testing.T) {
	w := httptest.NewRecorder()
	respondError(w, "上游返回了 \"引号\" 和\n换行", false)

	var body map[string]interface{}
	if err := json.Unmarshal(w.Body.Bytes(), &body); err != nil {
		t.Fatalf("非法 JSON: %v, body: %s", err, w.Body.String())
	}
	if body["code"].(float64) != -1 {
		t.Errorf("code 应为 -1, got %v", body["code"])
	}
	if w.Code != 500 {
		t.Errorf("服务端错误应返回 500, got %d", w.Code)
	}
}

// TestRespondErrorClientErr 客户端错误应返回 400
func TestRespondErrorClientErr(t *testing.T) {
	w := httptest.NewRecorder()
	respondError(w, "缺少 book_id 参数", true)
	if w.Code != 400 {
		t.Errorf("客户端错误应返回 400, got %d", w.Code)
	}
}

// TestHandleDetailMissingParam 缺少必需参数返回 400 而非透传到上游
func TestHandleDetailMissingParam(t *testing.T) {
	w := httptest.NewRecorder()
	HandleDetail(w, httptest.NewRequest("GET", "/detail", nil))
	if w.Code != 400 {
		t.Errorf("缺参应返回 400, got %d, body: %s", w.Code, w.Body.String())
	}
}