package main

import (
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestDevAssetsAreReloaded(t *testing.T) {
	dir := t.TempDir()
	if err := os.CopyFS(dir, os.DirFS(".")); err != nil {
		t.Fatal(err)
	}
	old := assets
	assets = os.DirFS(dir)
	defer func() { assets = old }()

	sys := System{ConfigDir: filepath.Join(dir, "config"), StateDir: dir}
	a := newApp(sys, newCollector(sys, ""), true)
	h := a.routes()
	if strings.Contains(do(h, "GET", "/login", nil, nil).Body.String(), "reloaded-marker") {
		t.Fatal("marker already there")
	}

	login := filepath.Join(dir, "templates", "login.html")
	data, _ := os.ReadFile(login)
	i := strings.LastIndex(string(data), "{{end}}")
	os.WriteFile(login, []byte(string(data)[:i]+"<p>reloaded-marker</p>"+string(data)[i:]), 0o600)
	if !strings.Contains(do(h, "GET", "/login", nil, nil).Body.String(), "reloaded-marker") {
		t.Fatal("an edited template is not picked up")
	}

	// A typo keeps the last good version.
	os.WriteFile(login, []byte("{{define \"content\"}}{{ broken"), 0o600)
	if !strings.Contains(do(h, "GET", "/login", nil, nil).Body.String(), "reloaded-marker") {
		t.Fatal("a broken template replaced the working one")
	}
}