package handlers_test

import (
	"context"
	"html/template"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/stretchr/testify/assert"
	"sneak.berlin/go/webhooker/internal/handlers"
)

// TestErrorPage_RenderFailureKeepsStatus proves that an error page
// which cannot render answers with the status it was reporting, as
// plain text, and is not attempted again: a page whose own render
// fails reaches the error page, and the error page failing as well
// ends there with the 500.
func TestErrorPage_RenderFailureKeepsStatus(t *testing.T) {
	t.Parallel()

	var h *handlers.Handlers

	app := newTestApp(t, &h)
	app.RequireStart()

	t.Cleanup(app.RequireStop)

	// .Status is an int, so asking it for a field fails the render.
	failing := `{{.Status.Missing}}`
	h.AddTemplateForTest("error.html", template.Must(
		template.New("error").Parse(failing),
	))
	h.AddTemplateForTest("failing.html", template.Must(
		template.New("failing").Parse(`{{.Data.Missing}}`),
	))

	req := httptest.NewRequestWithContext(
		context.Background(), http.MethodGet, "/", nil,
	)

	w := httptest.NewRecorder()
	h.HandleErrorPage(http.StatusNotFound).ServeHTTP(w, req)

	assert.Equal(t, http.StatusNotFound, w.Code)
	assert.Equal(t, "Not Found\n", w.Body.String())

	w = httptest.NewRecorder()
	h.RenderTemplateForTest(w, req, "failing.html", 0)

	assert.Equal(t, http.StatusInternalServerError, w.Code)
	assert.Equal(t, "Internal Server Error\n", w.Body.String())
}