package main

import (
	"fmt"
	"log"
	"os"
	"os/signal"
	"syscall"
	"strings"
	"time"
	"math/rand"

	"github.com/bwmarrin/discordgo"
	"github.com/spf13/viper"
)

func main() {
	vpr := viper.GetViper()
	vpr.SetConfigFile(".env")
	var token string = ""
	if err := vpr.ReadInConfig(); err != nil {
		if _, ok := err.(viper.ConfigFileNotFoundError); ok {
			log.Fatalln("Config file (.env) not found!")
		} else {
			log.Println("Failed to parse config!")
		}
	}

	if vpr.GetString("DISCORD_BOT_TOKEN") == "" {
		token = os.Getenv("DISCORD_BOT_TOKEN")
		if token == "" {
			log.Fatalln("Couldn't fetch bot token!")
		}
	} else {
		token = vpr.GetString("DISCORD_BOT_TOKEN")
	}

	dg, err := discordgo.New("Bot " + token)
	if err != nil {
		log.Fatalf("Error creating Discord session: %s\n", err)
	}

	dg.AddHandler(messageCreate)
	dg.Identify.Intents = discordgo.IntentsGuildMessages

	// connect to discord
	err = dg.Open()
	if err != nil {
		log.Fatalf("Couldn't connect to DIscord: %s\n", err)
	}

	// wait until ctrl+c or other term signal is received
	fmt.Println("The Farting Whale is online!")
	sc := make(chan os.Signal, 1)
	signal.Notify(sc, syscall.SIGINT, syscall.SIGTERM, os.Interrupt)
	<-sc

	// graceful shutdown
	dg.Close()
}

// incoming message handler
func messageCreate(s *discordgo.Session, m *discordgo.MessageCreate) {
	// ignore messages sent by the bot.
	if m.Author.ID == s.State.User.ID {
		return
	}

	if strings.HasPrefix(m.Content, "!ask") {
		possibleAnswers := []string{
			"Better not tell you now.",
			"Signs point to yes.",
			"My reply is no.",
			"Yes.",
			"Without a doubt.",
			"I don't think so.",
			"I doubt it.",
			"NO!",
			"Well... can't say for sure but maybe.",
			"I think you need sleep.",
			"Depends.",
			"Skibidi dop dop dop yes yes yes gang gang!!!111",
			"I don't think this is a good idea, honestly.",
			"SHUT. THE. FUCK. UP",
			"Hmm, let me think about that for a bit.",
		}
		rand.Seed(time.Now().Unix())
		reply := possibleAnswers[rand.Intn(len(possibleAnswers))]
		s.ChannelMessageSend(m.ChannelID, reply)
		return

	}

	if strings.HasPrefix(m.Content, "!fart") {
		c := strings.Fields(m.Content)
		if len(c) == 1 {
			s.ChannelMessageSend(m.ChannelID, ":whale2: :dash:")
		} else if len(c) == 2 {
			s.ChannelMessageSend(m.ChannelID, fmt.Sprintf(":whale2: :dash: %s", c[1]))
		}
		return
	}
}