package main

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

	"github.com/hamcha/tg"
)

type Macro struct {
	Value  string
	Author tg.APIUser
	Time   time.Time
}

var macropath *string
var macros map[string]Macro

func macro_init() {
	macros = make(map[string]Macro)
	file, err := os.Open(*macropath)
	if err != nil {
		return
	}
	defer file.Close()
	err = json.NewDecoder(file).Decode(&macros)
	if err != nil {
		log.Println("[macro] WARN: Could not load macros (malformed or unreadable file): " + err.Error())
		return
	}
	log.Printf("[macro] Loaded %d macros from %s\n", len(macros), *macropath)
}

func macro_message(broker *tg.Broker, update tg.APIMessage) {
	if isCommand(update, "macro") {
		parts := strings.SplitN(*(update.Text), " ", 3)
		switch len(parts) {
		case 2:
			var out string
			macroname := strings.ToLower(parts[1])
			item, ok := macros[macroname]
			if ok {
				out = fmt.Sprintf("<b>%s</b>\n%s\n<i>%s - %s</i>", macroname, item.Value, item.Author.Username, item.Time.Format("02-01-06 15:04"))
			} else {
				out = fmt.Sprintf("<b>%s</b>\n<i>macro inesistente</i>\n(configura con /macro %s <i>contenuto</i>)", macroname, macroname)
			}
			broker.SendTextMessage(update.Chat, out, &update.MessageID)
		case 3:
			macroname := strings.ToLower(parts[1])
			macros[macroname] = Macro{
				Value:  parts[2],
				Author: update.User,
				Time:   time.Now(),
			}
			savemacros()
			broker.SendTextMessage(update.Chat, fmt.Sprintf("<b>%s</b> → %s", macroname, parts[2]), &update.MessageID)
		default:
			broker.SendTextMessage(update.Chat, "<b>Sintassi</b>\n<b>Leggi</b>: /macro <i>nome-macro</i>\n<b>Scrivi</b>: /macro <i>nome-macro</i> <i>contenuto macro</i>", &update.MessageID)
		}
	}
}

func savemacros() {
	file, err := os.Create(*macropath)
	if err != nil {
		log.Println("[macro] WARN: Could not open macro db: " + err.Error())
		return
	}
	err = json.NewEncoder(file).Encode(macros)
	if err != nil {
		log.Println("[macro] WARN: Could not save macros into file: " + err.Error())
	}
}