package core

import (
	"bytes"
	"fmt"
	"os/exec"
	"math/rand"
	"sort"
	"strings"
	"time"

	"github.com/bwmarrin/discordgo"
)

func getAudioMessage(msg string) (filename string, file *bytes.Reader) {
	curr_time := time.Now().Unix()
	filename = fmt.Sprintf("/tmp/%d.mp3", curr_time)
	var cmd_args string = fmt.Sprintf("espeak-ng -s 120 -v mb-fr2 -p 30 '%s' --stdout",
		maxString(msg, 300))
	cmd := exec.Command("sh", "-c", cmd_args)
	out, err := cmd.CombinedOutput()
	if err != nil {
		fmt.Println(fmt.Sprint(err))
	}
	file = bytes.NewReader(out)
	return
}

func getHelpMessage() string {
	// build list of possible commands
	// TODO: currently, the help needs to get value initiated at startup time to be built.
	// I don't like that and wish to test what is rendered without connecting to the server
	var help []string
	for _, command := range CommandRegister {
		help = append(help,
			fmt.Sprintf(
				"%s : %s (Example : %s)\n",
				command.name,
				command.desc,
				command.example))
	}
	sort.Strings(help)
	welcome := fmt.Sprintf(
		"Hello, I'm **%s**. Here are the things I can do :\n",
		ConfigRegister.Name)
	return welcome + strings.Join(help, "")
}

func getHatMessage() string {
	hat := []string{"🧢", "👒", "⛑", "🎩", "🎓"}
	rand.Seed(time.Now().UnixNano())
	var amount int = rand.Intn(len(hat))
	var bag []string
	for i := 0; i < amount; i++ {
		rand.Seed(time.Now().UnixNano())
		bag = append(bag, hat[rand.Intn(len(hat))])
	}
	return strings.Join(bag, " ")
}

func MessageHandler(s *discordgo.Session, m *discordgo.MessageCreate) {
	for alias, _ := range CommandRegister {
		if strings.HasPrefix(m.Content, alias) {
			if m.Author.ID == s.State.User.ID {
				return
			}
			var message string = strings.TrimPrefix(m.Content, alias)
			CommandRegister[alias].command(s, m, message)
		}
	}
}

func MessageHat(s *discordgo.Session, m *discordgo.MessageCreate, message string) {
	s.ChannelMessageSend(m.ChannelID, getHatMessage())
}

func MessageTalkback(s *discordgo.Session, m *discordgo.MessageCreate) {
	if m.Author.ID == s.State.User.ID {
		return
	}
	for _, t := range ConfigRegister.Talkback {
		for _, p := range t.Domain.Patterns {
			rand.Seed(time.Now().UnixNano())
			if strings.Contains(strings.ToLower(m.Content), strings.ToLower(p)) &&
				rand.Intn(2) == 1 {
				rand.Seed(time.Now().UnixNano())
				answer := t.Domain.Answers[rand.Intn(len(t.Domain.Answers))]
				s.ChannelMessageSend(m.ChannelID, answer)
			}
		}
	}
}

func MessageHelp(s *discordgo.Session, m *discordgo.MessageCreate, message string) {
	s.ChannelMessageSend(m.ChannelID, getHelpMessage())
}

func MessagePing(s *discordgo.Session, m *discordgo.MessageCreate, message string) {
	if m.Content == "ping" {
		s.ChannelMessageSend(m.ChannelID, "Pong!")
	}

	if m.Content == "pong" {
		s.ChannelMessageSend(m.ChannelID, "Ping!")
	}
}

func MessageAudio(s *discordgo.Session, m *discordgo.MessageCreate, message string) {
	var cleanMessage string = prepareTTSMessage(message)
	filename, file := getAudioMessage(cleanMessage)
	s.ChannelFileSend(m.ChannelID, filename, file)
}