package discord

import (
	"fmt"
	"log"
	"os"
	"os/signal"
	"ticket-pimp/client/discord/handler"
	"ticket-pimp/internal/controller"
	"ticket-pimp/internal/domain"

	"github.com/bwmarrin/discordgo"
)

func initBotWith(token string) *discordgo.Session {
	discord, err := discordgo.New("Bot " + token)
	if err != nil {
		log.Fatalf("unable to create discord session: %v", err)
	}
	return discord
}

type DiscordOptions struct {
	AppConfig  *domain.Config
	Controller *controller.WorkflowController
}

func Run(conf domain.Config, opts DiscordOptions) error {
	token := conf.Discord.Token

	session := initBotWith(token)

	router := handler.InitRouter(*opts.Controller, &conf.Discord)

	commandHandlers := map[string]func(s *discordgo.Session, i *discordgo.InteractionCreate){}
	for _, handler := range router.Commands {
		commandHandlers[handler.Command.Name] = handler.Handler
	}

	componentsHandlers := map[string]func(s *discordgo.Session, i *discordgo.InteractionCreate){
		"task_start": router.Components[0].Handler,
		"task_close": router.Components[1].Handler,
	}

	session.AddHandler(func(s *discordgo.Session, i *discordgo.InteractionCreate) {
		switch i.Type {
		case discordgo.InteractionApplicationCommand:
			if h, ok := commandHandlers[i.ApplicationCommandData().Name]; ok {
				h(s, i)
			}
		case discordgo.InteractionMessageComponent:
			if h, ok := componentsHandlers[i.MessageComponentData().CustomID]; ok {
				h(s, i)
			}
		}
	})

	if err := session.Open(); err != nil {
		return fmt.Errorf("cannot open the session: %v", err)
	}

	// UPDATE FORUM IF NEEDED:

	forum, err := session.Channel(os.Getenv("TASKS_CHANNEL"))
	if err != nil {
		log.Print(err)
	}

	forum, err = session.ChannelEditComplex(forum.ID, &discordgo.ChannelEdit{
		AvailableTags: &router.Tags,
	})
	if err != nil {
		log.Fatal(err)
	} else {

	}

	log.Println("Adding commands...")
	var cmds []*discordgo.ApplicationCommand
	var logString []string
	for _, h := range router.Commands {
		cmd, err := session.ApplicationCommandCreate(session.State.User.ID, "", &h.Command)
		if err != nil {
			log.Panicf("Cannot create '%v' command: %v", h.Command.Name, err)
		}
		cmds = append(cmds, cmd)
		logString = append(logString, cmd.Name)
	}

	log.Println("Following commands added:")
	log.Println(logString)

	defer session.Close()
	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt)
	<-stop
	log.Println("Graceful shutdown")

	log.Println("Removing commands...")
	for _, h := range cmds {
		err := session.ApplicationCommandDelete(session.State.User.ID, "", h.ID)
		if err != nil {
			log.Panicf("Cannot delete '%v' command: %v", h.Name, err)
		}
	}
	return nil
}