package main

import (
	"encoding/json"
	"log"
	"os"
	"strings"
	"time"

	"git.fromouter.space/hamcha/tg"
)

var tzpath *string

type TZFile map[int64]string

var timezones TZFile
var tzlocs map[int64]*time.Location

func tz_init() {
	timezones = make(TZFile)
	tzlocs = make(map[int64]*time.Location)
	file, err := os.Open(*tzpath)
	if err != nil {
		return
	}
	defer file.Close()
	err = json.NewDecoder(file).Decode(&timezones)
	if err != nil {
		log.Println("[config/tz] WARN: Could not load custom timezones (malformed or unreadable file): " + err.Error())
		return
	}
	for uid, tzname := range timezones {
		tzlocs[uid], err = time.LoadLocation(tzname)
		if err != nil {
			log.Printf("[config/tz] Couldn't load tz data for %d: %s\n", uid, err.Error())
		}
	}
	log.Printf("[config/tz] Loaded %d timezone preferences from %s\n", len(timezones), *tzpath)
}

func tz_message(broker *tg.Broker, update tg.APIMessage) {
	if isCommand(update, "tz") {
		parts := strings.SplitN(*(update.Text), " ", 2)
		if len(parts) < 2 {
			broker.SendTextMessage(update.Chat, "<b>Formato:</b> /tz <i>nome_timezone</i>", &tg.MessageOptions{
				ReplyID: &update.MessageID,
			})
			return
		}

		loc, err := time.LoadLocation(parts[1])
		if err != nil {
			broker.SendTextMessage(update.Chat, "<b>Errore:</b> non sono riuscito a trovare una timezone chiamata <b>"+parts[1]+"</b>", &tg.MessageOptions{
				ReplyID: &update.MessageID,
			})
			return
		}

		tzlocs[update.User.UserID] = loc
		timezones[update.User.UserID] = parts[1]
		tz_save()
	}
}

func tz_save() error {
	file, err := os.Create(*tzpath)
	if err != nil {
		return err
	}
	defer file.Close()
	return json.NewEncoder(file).Encode(timezones)
}