package main

import (
	"fmt"
	"log"

	"github.com/bwmarrin/discordgo"
)

type RoleReaction struct {
	RoleName  string
	RoleId    string
	EmojiName string
	EmojiId   string
}

type ServerRoleAssignConfig struct {
	GuildId         string
	RoleReactionMap map[string]RoleReaction
	Message         *discordgo.Message
}

type ServerConfigOptionFunction func(s *discordgo.Session) ServerRoleAssignConfig

func InitRoleReactions(s *discordgo.Session) {
	addHubbubHandlers(s)
}

func addHubbubHandlers(s *discordgo.Session) {
	hubbubId := "827958531659530301"
	roleAssignChannelId := "855923187354959872"
	roleMap := map[string]RoleReaction{
		"🤓": {
			RoleName:  "Streamer",
			RoleId:    "827959638267002880",
			EmojiName: "nerd",
			EmojiId:   "🤓",
		},
		"😎": {
			RoleName:  "Viewer",
			RoleId:    "857793953125629992",
			EmojiName: "sunglasses",
			EmojiId:   "😎",
		},
	}
	serverConfig := getServerConfig(
		s,
		hubbubId,
		roleAssignChannelId,
		roleMap,
	)
	s.AddHandler(roleAddHandler(serverConfig))
	s.AddHandler(roleRemoveHandler(serverConfig))
}

func getServerConfig(
	s *discordgo.Session,
	guildId string,
	roleAssignChannelId string,
	roleMap map[string]RoleReaction,
) ServerRoleAssignConfig {
	serverConfig := ServerRoleAssignConfig{
		GuildId:         guildId,
		RoleReactionMap: roleMap,
	}

	messages, err := s.ChannelMessages(roleAssignChannelId, 1, "", "", "")
	if err != nil {
		log.Fatal(err)
	}

	if len(messages) == 0 {
		content := "React to this message to get a role!\n"
		for emote, role := range roleMap {
			content += fmt.Sprintf("%s : %s\n", emote, role.RoleName)
		}
		message, err := s.ChannelMessageSend(roleAssignChannelId, content)
		if err != nil {
			log.Fatal(err)
		}
		for _, role := range roleMap {
			err := s.MessageReactionAdd(roleAssignChannelId, message.ID, role.EmojiId)
			if err != nil {
				log.Fatal(err)
			}
		}
		serverConfig.Message = message
	} else {
		serverConfig.Message = messages[0]
	}

	return serverConfig
}

func roleAddHandler(
	serverConfig ServerRoleAssignConfig,
) func(s *discordgo.Session, r *discordgo.MessageReactionAdd) {
	return func(s *discordgo.Session, r *discordgo.MessageReactionAdd) {
		if r.MessageID != serverConfig.Message.ID {
			return
		}

		if role, ok := serverConfig.RoleReactionMap[r.Emoji.Name]; ok {
			err := s.GuildMemberRoleAdd(serverConfig.GuildId, r.UserID, role.RoleId)
			if err != nil {
				log.Println(err)
			}
		}
	}
}

func roleRemoveHandler(
	serverConfig ServerRoleAssignConfig,
) func(s *discordgo.Session, r *discordgo.MessageReactionRemove) {
	return func(s *discordgo.Session, r *discordgo.MessageReactionRemove) {
		if r.MessageID != serverConfig.Message.ID {
			return
		}

		if role, ok := serverConfig.RoleReactionMap[r.Emoji.Name]; ok {
			err := s.GuildMemberRoleRemove(serverConfig.GuildId, r.UserID, role.RoleId)
			if err != nil {
				log.Println(err)
			}
		}
	}
}