/*
    MastoGem, A Mastodon proxy for Gemini
    Copyright (C) 2021 Romain de Laage

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
package main

import (
	"html"
	"regexp"
	"strings"
	"os"
	"io/ioutil"
	"encoding/json"
	"log"
)

func getConfig() Config {
	configPath := os.Getenv("MASTOGEM_CONFIG_PATH")
	if configPath == "" {
		log.Println("MASTOGEM_CONFIG_PATH was not set, using default settings")

		config := Config{
			Listen: "127.0.0.1:1965",
			CertPath: "certs/cert.pem",
			KeyPath: "certs/key.rsa",
			BaseURL: "https://mamot.fr",
			Title: "MastoGem",
			HomeMessage: "Welcome on MastoGem, this is a Mastodon proxy for Gemini. You can view the last 20 toots of a Mastodon account by providing its ID.",
		}

		return config
	}

	configFile, err := ioutil.ReadFile(configPath)
	if err != nil {
		log.Fatalln("config file: %s", err)
	}

	var config Config

	json.Unmarshal(configFile, &config)

	return config
}

func removeHTMLTags(content string) string {
	text := strings.ReplaceAll(content, "<p>", "")
	text = strings.ReplaceAll(text, "</p>", "\n\n")
	text = strings.ReplaceAll(text, "<br />", "\n")
	text = strings.ReplaceAll(text, "<br>", "\n")
	text = strings.ReplaceAll(text, "</a>", "")
	text = strings.ReplaceAll(text, "</span>", "")
	regexString := "<a( [^>]*)?>"
	regex, err := regexp.Compile(regexString)
	if err != nil {
		log.Println("regex: %s", err)
		return ""
	}
	text = regex.ReplaceAllLiteralString(text, "")
	regexString = "<span( [^>]*)?>"
	regex, err = regexp.Compile(regexString)
	if err != nil {
		log.Println("regex: %s", err)
		return ""
	}
	text = regex.ReplaceAllLiteralString(text, "")
	text = html.UnescapeString(text)

	return text
}