// 自 go-hua/httpx 整体移植的单元测试（覆盖 OkJson/ErrorJson/Parse 绑定/ParseXML），
// 并补充 Handle/HandleResult 用例。
package httpx

import (
	"errors"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"github.com/gin-gonic/gin"
)

type bindReq struct {
	Username string `form:"username" json:"username" uri:"username" header:"X-Username"`
	Password string `form:"password" json:"password" uri:"password"`
}

func (r *bindReq) Validate() error {
	if r.Username == "" {
		return New(1001, "用户名不能为空")
	}
	return nil
}

func newTestContext(body string) (*gin.Context, *httptest.ResponseRecorder) {
	gin.SetMode(gin.TestMode)
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	if body != "" {
		c.Request = httptest.NewRequest(http.MethodPost, "/", strings.NewReader(body))
	}
	return c, w
}

func TestNewCodeMsg(t *testing.T) {
	err := New(1001, "业务错误")
	cm, ok := err.(*CodeMsg)
	if !ok {
		t.Fatalf("New 应返回 *CodeMsg, got %T", err)
	}
	if cm.Code != 1001 {
		t.Errorf("Code = %d, want 1001", cm.Code)
	}
	if cm.Msg != "业务错误" {
		t.Errorf("Msg = %q", cm.Msg)
	}
	if cm.Error() != "code: 1001, msg: 业务错误" {
		t.Errorf("Error() = %q", cm.Error())
	}
}

func TestOkJson(t *testing.T) {
	c, w := newTestContext("")
	OkJson(c, map[string]string{"k": "v"})
	if !strings.Contains(w.Body.String(), `"code":0`) {
		t.Errorf("OkJson 输出缺少 code:0: %s", w.Body.String())
	}
	if !strings.Contains(w.Body.String(), `"data"`) {
		t.Errorf("OkJson 输出缺少 data: %s", w.Body.String())
	}
}

func TestErrorJson(t *testing.T) {
	c, w := newTestContext("")
	ErrorJson(c, New(1001, "业务错误"))
	// *CodeMsg 应使用其业务错误码与消息
	if !strings.Contains(w.Body.String(), `"code":1001`) {
		t.Errorf("ErrorJson 输出缺少 code:1001: %s", w.Body.String())
	}
	if !strings.Contains(w.Body.String(), `"msg":"业务错误"`) {
		t.Errorf("ErrorJson msg 不符: %s", w.Body.String())
	}
}

func TestErrorJsonPlainError(t *testing.T) {
	c, w := newTestContext("")
	ErrorJson(c, errors.New("数据库连接失败"))
	// 非 *CodeMsg 的 error 统一 code=1，msg 为 err.Error()
	if !strings.Contains(w.Body.String(), `"code":1`) {
		t.Errorf("普通错误 code 应为 1: %s", w.Body.String())
	}
	if !strings.Contains(w.Body.String(), `"msg":"数据库连接失败"`) {
		t.Errorf("普通错误 msg 不符: %s", w.Body.String())
	}
}

func TestParseQueryBinding(t *testing.T) {
	gin.SetMode(gin.TestMode)
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodGet, "/?username=admin&password=123", nil)

	req := &bindReq{}
	if err := Parse(c, req); err != nil {
		t.Fatalf("Parse: %v", err)
	}
	if req.Username != "admin" || req.Password != "123" {
		t.Errorf("query 绑定结果 = %+v", req)
	}
}

func TestParseJsonBinding(t *testing.T) {
	gin.SetMode(gin.TestMode)
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/", strings.NewReader(`{"username":"admin","password":"123"}`))
	c.Request.Header.Set("Content-Type", "application/json")

	req := &bindReq{}
	if err := Parse(c, req); err != nil {
		t.Fatalf("Parse: %v", err)
	}
	if req.Username != "admin" || req.Password != "123" {
		t.Errorf("json 绑定结果 = %+v", req)
	}
}

func TestParseHeaderBinding(t *testing.T) {
	gin.SetMode(gin.TestMode)
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodGet, "/", nil)
	c.Request.Header.Set("X-Username", "admin")

	req := &bindReq{}
	if err := Parse(c, req); err != nil {
		t.Fatalf("Parse: %v", err)
	}
	if req.Username != "admin" {
		t.Errorf("header 绑定结果 = %+v", req)
	}
}

func TestParseUriBinding(t *testing.T) {
	gin.SetMode(gin.TestMode)
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodGet, "/1/admin", nil)
	// Parse 仅当存在 id 参数时才执行 uri 绑定
	c.Params = gin.Params{{Key: "id", Value: "1"}, {Key: "username", Value: "admin"}, {Key: "password", Value: "123"}}

	req := &bindReq{}
	if err := Parse(c, req); err != nil {
		t.Fatalf("Parse: %v", err)
	}
	if req.Username != "admin" || req.Password != "123" {
		t.Errorf("uri 绑定结果 = %+v", req)
	}
}

func TestParseValidateFail(t *testing.T) {
	gin.SetMode(gin.TestMode)
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodGet, "/", nil)

	req := &bindReq{}
	err := Parse(c, req)
	if err == nil {
		t.Fatal("Validate 失败应返回错误")
	}
	if cm, ok := err.(*CodeMsg); !ok || cm.Code != 1001 {
		t.Errorf("错误类型应为 *CodeMsg(1001), got %T %v", err, err)
	}
}

func TestParseXML(t *testing.T) {
	gin.SetMode(gin.TestMode)
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/", strings.NewReader(`<bindReq><Username>admin</Username></bindReq>`))

	req := &bindReq{}
	if err := ParseXML(c, req); err != nil {
		t.Fatalf("ParseXML: %v", err)
	}
	if req.Username != "admin" {
		t.Errorf("xml 绑定结果 = %+v", req)
	}
}

func TestParseXMLEmptyBody(t *testing.T) {
	gin.SetMode(gin.TestMode)
	w := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(w)
	c.Request = httptest.NewRequest(http.MethodPost, "/", nil)

	req := &bindReq{}
	if err := ParseXML(c, req); err != nil {
		t.Fatalf("空请求体 ParseXML 应返回 nil: %v", err)
	}
	if req.Username != "" {
		t.Errorf("空请求体不应绑定出值: %+v", req)
	}
}

func TestHandle(t *testing.T) {
	c, w := newTestContext(`{"username":"admin","password":"123"}`)
	c.Request.Header.Set("Content-Type", "application/json")
	Handle(c, func(req *bindReq) (*map[string]string, error) {
		return &map[string]string{"user": req.Username}, nil
	})
	if !strings.Contains(w.Body.String(), `"user":"admin"`) {
		t.Errorf("Handle 输出缺 data: %s", w.Body.String())
	}
}

func TestHandleBizError(t *testing.T) {
	c, w := newTestContext(`{"username":"admin","password":"123"}`)
	c.Request.Header.Set("Content-Type", "application/json")
	Handle(c, func(req *bindReq) (*map[string]string, error) {
		return nil, New(1002, "被拦了")
	})
	if !strings.Contains(w.Body.String(), `"code":1002`) {
		t.Errorf("Handle 业务错误应透传 CodeMsg: %s", w.Body.String())
	}
}

func TestHandleResult(t *testing.T) {
	c, w := newTestContext("")
	HandleResult(c, map[string]string{"k": "v"}, nil)
	if !strings.Contains(w.Body.String(), `"k":"v"`) {
		t.Errorf("HandleResult 成功输出不符: %s", w.Body.String())
	}

	c, w = newTestContext("")
	HandleResult(c, nil, New(1003, "失败了"))
	if !strings.Contains(w.Body.String(), `"code":1003`) {
		t.Errorf("HandleResult 错误输出不符: %s", w.Body.String())
	}
}