package main

import (
	"encoding/json"
	"fmt"
	"html/template"
	"log"
	"net/http"
	"os"
	"regexp"
	"slices"
)

type AllowedFiles struct {
	AllowedFiles []string
}

func (a *AllowedFiles) GetFiles(w http.ResponseWriter, r *http.Request) {
	log.Println("Request for:", r.URL.String())
	url := fmt.Sprintf("static%s", r.URL.String())
	htmlRegex, err := regexp.Compile("^static/.*\\.html$")
	if err != nil {
		ErrorPage(w, 500)
		return
	}

	if url == "static/" {
		url = "static/index.html"
	}

	if !slices.Contains(a.AllowedFiles, url) {
		ErrorPage(w, 404)
		return
	}

	if htmlRegex.MatchString(url) {
		t := template.Must(template.ParseFiles("templates/template.html"))

		html, err := os.ReadFile(url)
		if err != nil {
			ErrorPage(w, 500)
			return
		}

		t.Execute(w, template.HTML(html))
	} else {
		http.ServeFile(w, r, url)
	}
}

func GetAllowed(path string) (*AllowedFiles, error) {
	var allowed AllowedFiles

	allowedJson, err := os.ReadFile(path)
	if err != nil {
		return nil, err
	}

	err = json.Unmarshal(allowedJson, &allowed)
	return &allowed, err
}