package main

import (
	"bytes"
	"errors"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

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

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

	var logBuffer bytes.Buffer
	previousLogger := slog.Default()
	slog.SetDefault(slog.New(slog.NewTextHandler(&logBuffer, &slog.HandlerOptions{})))
	defer slog.SetDefault(previousLogger)

	router := gin.New()
	router.Use(requestLogger())
	router.GET("/fail", func(c *gin.Context) {
		_ = c.Error(errors.New("root cause"))
		c.JSON(http.StatusBadRequest, gin.H{"error": "do not log this body"})
	})

	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/fail?debug=1", nil)
	router.ServeHTTP(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Fatalf("expected 400, got %d", rec.Code)
	}

	logOutput := logBuffer.String()
	if !strings.Contains(logOutput, "request failed") {
		t.Fatalf("expected request failure log, got %q", logOutput)
	}
	if strings.Contains(logOutput, "do not log this body") {
		t.Fatalf("response body leaked into logs: %q", logOutput)
	}
	if !strings.Contains(logOutput, "root cause") {
		t.Fatalf("expected error details in logs, got %q", logOutput)
	}
}