package modules

import (
	"fmt"

	"github.com/bwmarrin/discordgo"

	"TerraOceanBot/db"
	"TerraOceanBot/discord/config"
)

var pendingInviteConfirmation = make(map[string]invite)

type invite struct {
	User   string
	Reason string
}

var createInvite = enforceDM(memberFilter(true,
	func(s *discordgo.Session, m *discordgo.MessageCreate, command []string) {
		if len(command) < 2 {
			s.ChannelMessageSend(m.ChannelID, "指令的使用方法是`!invite <你所要设置的验证码>`.\nUsage: `!invite <validation code>`")
			return
		}
		if len(command) > 2 {
			s.ChannelMessageSend(m.ChannelID, "所提供的验证码不得有任何空格。\nThe provided validation code cannot contain any spaces.")
			return
		}

		err := db.SetInviteOwner(command[1], m.Author.ID)
		switch err {
		case db.ErrAlreadyExists:
			owner, _ := db.GetInviteOwner(command[1])
			if owner == m.Author.ID {
				s.ChannelMessageSend(
					m.ChannelID,
					"这个验证码归你所有，它仍然未被使用。请把它告诉你要邀请的人。\nThis validation code belongs to you. Please give it to the person you want to invite.",
				)
				return
			}
			s.ChannelMessageSend(
				m.ChannelID,
				"这个验证码已被其他会员注册。请使用别的验证码。\nThis validation code is already registered. Please try another one.",
			)
		case db.ErrInviteUsed:
			s.ChannelMessageSend(
				m.ChannelID,
				"这个验证码已被使用。请使用别的验证码。\nThis validation code has already been used. Please try another one.",
			)
		case nil:
			s.ChannelMessageSend(
				m.ChannelID,
				"这个验证码现在属于你了。请好好保管并把它交给你要邀请的人。\nThis validation code now belongs to you! Pass it on to the person you want to invite.",
			)
		default:
			s.ChannelMessageSend(
				m.ChannelID,
				"不明错误已发生，请把这个错误信息发在群里。\nAn unknown error has occurred. Please pass this error message on.\n"+err.Error(),
			)
		}
	},
))

var checkUseInvite = enforceDM(memberFilter(false, enforceArgumentCount(
	config.ValidateUsage, 3,
	func(s *discordgo.Session, m *discordgo.MessageCreate, command []string) {
		inviter, err := db.GetInviteOwner(command[1])
		if err == db.ErrInviteUsed {
			initNewEmbed(config.ErrorValidateTitle, config.ErrorValidationCodeReuse, config.ErrorColour).
				Send(s, m.ChannelID)
			return
		}
		if err == db.ErrNotFound {
			initNewEmbed(config.ErrorValidateTitle, config.ErrorValidationCodeNotExist, config.ErrorColour).
				SendPM(s, m.ChannelID)
			return
		}
		if err != nil {
			auditError(s, m.ChannelID, err)
			return
		}

		db.UseInvite(command[1])
		member, err := s.GuildMember(config.GuildID, inviter)
		if err != nil {
			auditErrorPM(s, m.ChannelID, err)
			return
		}

		isMember := false
		for _, v := range member.Roles {
			if v == config.MemberRoleID {
				isMember = true
			}
		}
		if !isMember {
			initNewEmbed(config.ErrorValidateTitle, config.ErrorValidationCodeNotOwnedByMember, config.ErrorColour).
				SendPM(s, m.ChannelID)
			return
		}

		channel, err := s.UserChannelCreate(inviter)
		if err != nil {
			initNewEmbed(config.ErrorValidateTitle, config.ErrorValidationCodeCreatorDisabledPM, config.ErrorColour).
				SendPM(s, m.ChannelID)
			return
		}
		msg, err := s.ChannelMessageSend(channel.ID, fmt.Sprintf("<@%s>正在尝试使用验证码%s。请问是否同意该使用？", m.Author.ID, command[1]))
		if err != nil {
			auditErrorPM(s, m.ChannelID, err)
			return
		}
		pendingInviteConfirmation[msg.ID] = invite{
			User:   m.Author.ID,
			Reason: command[2],
		}
		s.MessageReactionAdd(channel.ID, msg.ID, emojiX)
		s.MessageReactionAdd(channel.ID, msg.ID, emojiCheck)
		initNewEmbed(config.SuccessTitle, config.ValidateSuccess, config.SuccessColour).
			SendPM(s, m.ChannelID)
	},
)))

func CheckForInvite(s *discordgo.Session, r *discordgo.MessageReactionAdd) {
	if r.UserID == s.State.User.ID {
		return
	}

	invite, ok := pendingInviteConfirmation[r.MessageID]
	if !ok {
		return
	}
	delete(pendingInviteConfirmation, r.MessageID)

	switch r.Emoji.Name {
	case emojiX:
		s.ChannelMessageSend(r.ChannelID, "已成功拒绝该验证码的使用。为了保护你，该验证码已被无效化。\nThe use of this validation code has been rejected. This validation code has been invalidated to protect you.")
		return
	case emojiCheck:
	default:
		return
	}

	s.ChannelMessageSend(r.ChannelID, "已同意验证码的使用。该验证码已被无效化。\nUse of validation code accepted. This validation code has been invalidated.")

	msg, err := s.ChannelMessageSend(config.VoteChannel, "正在准备新的一个投票…… Preparing for the next vote...")
	if err != nil {
		auditErrorPM(s, r.UserID, err)
		return
	}
	id, err := db.CreateInviteVote(msg.ID, invite.User, invite.Reason)
	if err != nil {
		auditErrorPM(s, r.UserID, err)
		return
	}
	auditInfo(s, fmt.Sprintf("Vote ID %d has been created by <@%s>.", id, r.UserID))
	s.ChannelMessageEdit(config.VoteChannel, msg.ID, "")
	s.ChannelMessageEditEmbed(config.VoteChannel, msg.ID, createInviteEmbed(id, invite.User+":"+invite.Reason))
	s.MessageReactionAdd(config.VoteChannel, msg.ID, emojiX)
	s.MessageReactionAdd(config.VoteChannel, msg.ID, emojiOne)
	s.MessageReactionAdd(config.VoteChannel, msg.ID, emojiTwo)
	s.MessageReactionAdd(config.VoteChannel, msg.ID, emojiThree)
	s.MessageReactionAdd(config.VoteChannel, msg.ID, emojiFour)
	s.MessageReactionAdd(config.VoteChannel, msg.ID, emojiFive)
	s.MessageReactionAdd(config.VoteChannel, msg.ID, emojiCheck)
}