package middleware

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

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

func TestResponseWrapper_WrapsSuccessfulJSONPayload(t *testing.T) {
	gin.SetMode(gin.TestMode)

	recorder := httptest.NewRecorder()
	router := gin.New()
	router.Use(ResponseWrapper())
	router.GET("/users", func(c *gin.Context) {
		c.JSON(http.StatusOK, gin.H{"id": 1, "name": "alice"})
	})

	req := httptest.NewRequest(http.MethodGet, "/users", nil)
	router.ServeHTTP(recorder, req)

	if recorder.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", recorder.Code)
	}
	want := `{"code":0,"data":{"id":1,"name":"alice"},"message":"success"}`
	if got := recorder.Body.String(); got != want {
		t.Fatalf("body = %s, want %s", got, want)
	}
}

func TestResponseWrapper_PassesThroughMarkedResponses(t *testing.T) {
	gin.SetMode(gin.TestMode)

	recorder := httptest.NewRecorder()
	router := gin.New()
	router.Use(ResponseWrapper())
	router.GET("/users", func(c *gin.Context) {
		WrapResponse(c)
		c.JSON(http.StatusOK, gin.H{"code": 0, "message": "already wrapped"})
	})

	req := httptest.NewRequest(http.MethodGet, "/users", nil)
	router.ServeHTTP(recorder, req)

	if recorder.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", recorder.Code)
	}
	want := `{"code":0,"message":"already wrapped"}`
	if got := recorder.Body.String(); got != want {
		t.Fatalf("body = %s, want %s", got, want)
	}
}

func TestResponseWrapper_PassesThroughNonSuccessStatus(t *testing.T) {
	gin.SetMode(gin.TestMode)

	recorder := httptest.NewRecorder()
	router := gin.New()
	router.Use(ResponseWrapper())
	router.GET("/users", func(c *gin.Context) {
		c.JSON(http.StatusBadRequest, gin.H{"message": "bad request"})
	})

	req := httptest.NewRequest(http.MethodGet, "/users", nil)
	router.ServeHTTP(recorder, req)

	if recorder.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", recorder.Code)
	}
	want := `{"message":"bad request"}`
	if got := recorder.Body.String(); got != want {
		t.Fatalf("body = %s, want %s", got, want)
	}
}

func TestResponseWrapper_PassesThroughInvalidJSON(t *testing.T) {
	gin.SetMode(gin.TestMode)

	recorder := httptest.NewRecorder()
	router := gin.New()
	router.Use(ResponseWrapper())
	router.GET("/users", func(c *gin.Context) {
		c.Writer.WriteHeader(http.StatusOK)
		_, _ = c.Writer.WriteString("plain text")
	})

	req := httptest.NewRequest(http.MethodGet, "/users", nil)
	router.ServeHTTP(recorder, req)

	if recorder.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", recorder.Code)
	}
	if got := recorder.Body.String(); got != "plain text" {
		t.Fatalf("body = %q, want plain text", got)
	}
}

func TestResponseWrapper_NoWrapperMarksContext(t *testing.T) {
	gin.SetMode(gin.TestMode)

	recorder := httptest.NewRecorder()
	router := gin.New()
	router.Use(NoWrapper())
	router.GET("/users", func(c *gin.Context) {
		if _, exists := c.Get("response_wrapped"); !exists {
			t.Fatal("expected response_wrapped marker in context")
		}
		c.JSON(http.StatusOK, gin.H{"ok": true})
	})

	req := httptest.NewRequest(http.MethodGet, "/users", nil)
	router.ServeHTTP(recorder, req)

	if recorder.Code != http.StatusOK {
		t.Fatalf("expected 200, got %d", recorder.Code)
	}
}