package main

import (
	"fmt"
	"os"
	"os/signal"
	"strings"
	"time"

	"github.com/bwmarrin/discordgo"
)

var WaitingLength = 1 * time.Hour

// user data
type WaitingUser struct {
	ID       string
	Username string
	AddedAt  time.Time
	EndAt    time.Time
	Timer    *time.Timer
}

func NewWaitingUser(id, username string, timer *time.Timer) WaitingUser {
	return WaitingUser{
		ID:       id,
		Username: username,
		AddedAt:  time.Now(),
		EndAt:    time.Now().Add(WaitingLength),
		Timer:    timer,
	}
}

func (wu *WaitingUser) UpdateTimer() {
	wu.Timer.Reset(WaitingLength)
	wu.EndAt = time.Now().Add(WaitingLength)
}

var WaitingUsersList []WaitingUser

func lookupWaitingUserIndex(userID string) int {
	for i := range WaitingUsersList {
		if WaitingUsersList[i].ID == userID {
			return i
		}
	}
	return -1
}

func main() {
	discordToken := os.Getenv("DISCORD_TOKEN")
	discordChannelId := os.Getenv("DISCORD_CHANNEL_ID")

	discord, err := discordgo.New("Bot " + discordToken)
	if err != nil {
		panic(err)
	}

	discord.AddHandler(func(s *discordgo.Session, r *discordgo.Ready) {
		fmt.Println("Bot is now running.  Press CTRL+C to exit.")

	})
	discord.AddHandler(func(s *discordgo.Session, i *discordgo.InteractionCreate) {
		if i.Type == discordgo.InteractionApplicationCommand {
			if i.ChannelID != discordChannelId {
				s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
					Type: discordgo.InteractionResponseChannelMessageWithSource,
					Data: &discordgo.InteractionResponseData{
						Content: "コマンドを使うチャンネルを間違ってますよ。",
					},
				})
			}
			roles, _ := s.GuildRoles(i.GuildID)
			var discordWaintingRoleId string
			for _, role := range roles {
				if role.Name == "WAITING" {
					discordWaintingRoleId = role.ID
				}
			}
			fmt.Println("GuildId: ", i.GuildID, " User ID: ", i.Member.User.ID, " Role ID: ", discordWaintingRoleId)
			switch i.ApplicationCommandData().Name {
			case "waitlistadd":
				// Handle addwait command
				// check if user is already in the waiting list
				index := lookupWaitingUserIndex(i.Member.User.ID)
				if index == -1 { //not in waiting list
					err2 := discord.GuildMemberRoleAdd(i.GuildID, i.Member.User.ID, discordWaintingRoleId)
					if err2 != nil {
						panic(err2)
					}
					timer := time.AfterFunc(WaitingLength, func() {
						discord.GuildMemberRoleRemove(i.GuildID, i.Member.User.ID, discordWaintingRoleId)
						index := lookupWaitingUserIndex(i.Member.User.ID)
						if index != -1 {
							WaitingUsersList = append(WaitingUsersList[:index], WaitingUsersList[index+1:]...)
						}
					})
					WaitingUsersList = append(WaitingUsersList, NewWaitingUser(i.Member.User.ID, i.Member.User.Username, timer))
					s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
						Type: discordgo.InteractionResponseChannelMessageWithSource,
						Data: &discordgo.InteractionResponseData{
							Content: i.Member.User.Username + " を待機リストに追加しました。",
						},
					})

				} else {
					// User is already in the waiting list, extend their waiting time
					WaitingUsersList[index].UpdateTimer()
					s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
						Type: discordgo.InteractionResponseChannelMessageWithSource,
						Data: &discordgo.InteractionResponseData{
							Content: i.Member.User.Username + " の待機時間を延長しました。",
						},
					})
				}

			case "waitlistshow":
				// Handle waitlistshow command
				var waitingUsersStr []string
				for _, user := range WaitingUsersList {
					waitingUsersStr = append(waitingUsersStr, user.Username+" ("+user.EndAt.Format("15:04")+"まで)")
				}
				s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
					Type: discordgo.InteractionResponseChannelMessageWithSource,
					Data: &discordgo.InteractionResponseData{
						Content: "Waiting list: " + strings.Join(waitingUsersStr, ", "),
					},
				})
			case "waitlistremove":
				// Handle waitlistremove command
				userID := i.ApplicationCommandData().GetOption("user").UserValue(s).ID
				userName := i.ApplicationCommandData().GetOption("user").UserValue(s).Username
				discord.GuildMemberRoleRemove(i.GuildID, userID, discordWaintingRoleId)
				index := lookupWaitingUserIndex(userID)
				if index != -1 {
					WaitingUsersList = append(WaitingUsersList[:index], WaitingUsersList[index+1:]...)
					s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
						Type: discordgo.InteractionResponseChannelMessageWithSource,
						Data: &discordgo.InteractionResponseData{
							Content: userName + " を待機リストから削除しました。",
						},
					})
				} else {
					s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
						Type: discordgo.InteractionResponseChannelMessageWithSource,
						Data: &discordgo.InteractionResponseData{
							Content: userName + " は待機リストにいません。",
						},
					})
				}

			case "waitlistremoveall":
				// Handle waitlistremoveall command
				for _, user := range WaitingUsersList {
					discord.GuildMemberRoleRemove(i.GuildID, user.ID, discordWaintingRoleId)
					user.Timer.Stop()
				}
				WaitingUsersList = nil
				s.InteractionRespond(i.Interaction, &discordgo.InteractionResponse{
					Type: discordgo.InteractionResponseChannelMessageWithSource,
					Data: &discordgo.InteractionResponseData{
						Content: "全員を待機リストから削除しました。",
					},
				})
			}
		}
	})

	openErr := discord.Open()
	if openErr != nil {
		panic(openErr)
	}
	// define command to wait
	discord.ApplicationCommandCreate(discord.State.User.ID, "", &discordgo.ApplicationCommand{
		Name:        "waitlistadd",
		Description: "待機リストに自分を追加する",
		Options:     []*discordgo.ApplicationCommandOption{},
	})

	discord.ApplicationCommandCreate(discord.State.User.ID, "", &discordgo.ApplicationCommand{
		Name:        "waitlistshow",
		Description: "待機リストを表示する",
		Options:     []*discordgo.ApplicationCommandOption{},
	})

	discord.ApplicationCommandCreate(discord.State.User.ID, "", &discordgo.ApplicationCommand{
		Name:        "waitlistremove",
		Description: "待機リストからユーザーを削除する",
		Options: []*discordgo.ApplicationCommandOption{
			{
				Name:        "user",
				Description: "待機リストから削除するユーザー",
				Type:        discordgo.ApplicationCommandOptionUser,
				Required:    true,
			},
		},
	})

	discord.ApplicationCommandCreate(discord.State.User.ID, "", &discordgo.ApplicationCommand{
		Name:        "waitlistremoveall",
		Description: "待機リストから全員を削除する",
		Options:     []*discordgo.ApplicationCommandOption{},
	})

	stop := make(chan os.Signal, 1)
	signal.Notify(stop, os.Interrupt)
	fmt.Println("Press Ctrl+C to exit")
	<-stop

}