package ginext

import (
	"bytes"
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

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

func TestBodyBuffer_WrapsBody(t *testing.T) {
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/", strings.NewReader("payload"))

	original := c.Request.Body
	BodyBuffer(c)
	if c.Request.Body == original {
		t.Fatalf("expected body to be replaced with buffered reader")
	}

	data, err := io.ReadAll(c.Request.Body)
	if err != nil {
		t.Fatalf("read err: %v", err)
	}
	if !bytes.Equal(data, []byte("payload")) {
		t.Fatalf("body mismatch: %q", data)
	}
}

func TestBodyBuffer_NilBody(t *testing.T) {
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodGet, "/", nil)
	c.Request.Body = nil

	// Should not panic
	BodyBuffer(c)
	if c.Request.Body != nil {
		t.Fatalf("expected nil body to remain nil")
	}
}