package handlers

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

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

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

	tmpl := template.Must(template.New("broken.html").Funcs(template.FuncMap{
		"boom": func() (string, error) {
			return "", errors.New("secret template failure")
		},
	}).Parse(`{{define "broken.html"}}{{boom}}{{end}}`))

	handler := &WebHandler{
		templates: map[string]*template.Template{
			"broken.html": tmpl,
		},
	}

	rec := httptest.NewRecorder()
	ctx, _ := gin.CreateTestContext(rec)
	ctx.Request = httptest.NewRequest(http.MethodGet, "/broken", nil)

	handler.render(ctx, "broken.html", gin.H{})

	if rec.Code != http.StatusInternalServerError {
		t.Fatalf("expected 500, got %d", rec.Code)
	}
	if body := strings.TrimSpace(rec.Body.String()); body != "Template error" {
		t.Fatalf("expected generic template error, got %q", body)
	}
	if len(ctx.Errors) != 1 {
		t.Fatalf("expected logged template error, got %d", len(ctx.Errors))
	}
	if !strings.Contains(ctx.Errors.String(), "secret template failure") {
		t.Fatalf("expected original error in gin context, got %q", ctx.Errors.String())
	}
}
