package main

import (
	"log"
	"os"
	"strings"
	"unicode"

	"io/ioutil"
	"path/filepath"

	"github.com/hamcha/tg"
	gomarkov "github.com/simon-weber/gomarkov"
)

var orogen *gomarkov.Chain

func oroscopo_init() {
	counter := 0
	orogen = gomarkov.NewChain()
	filepath.Walk(*oropath, func(path string, info os.FileInfo, err error) error {
		if info.IsDir() {
			return nil
		}

		data, err := ioutil.ReadFile(path)
		if err != nil {
			return err
		}

		orogen.Update(string(data))
		counter++

		return nil
	})

	log.Printf("[oroscopo] Loaded corpus from %d files\n", counter)
}

func oroscopo_message(broker *tg.Broker, update tg.APIMessage) {
	if isCommand(update, "oroscopo") {
		var err error
		var txt string
		tries := 0
		for tries < 10 {
			txt, err = orogen.Respond("", 20, 100)
			if err != nil {
				txt = err.Error()
				tries++
				continue
			}
			// Find end
			idx := strings.LastIndexByte(txt, '.')
			if idx < 10 {
				tries++
				continue
			}
			txt = txt[:idx]

			// Find beginning
			idx = strings.IndexFunc(txt, unicode.IsUpper)
			if idx < 0 {
				tries++
				continue
			}
			txt = txt[idx:]
			break
		}
		broker.SendTextMessage(update.Chat, "<b>Ecco cosa dicono le stelle:</b>\n"+txt+".", &update.MessageID)
	}
}