package modules

import (
	"fmt"
	"strconv"
	"strings"

	"github.com/bwmarrin/discordgo"

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

type voteType struct {
	EmbedBuilder  func(id int, name string) *discordgo.MessageEmbed
	ResultHandler func(s *discordgo.Session, id int, name string, isPositive bool)
}

var voteTypes = map[string]voteType{
	"custom": voteType{
		EmbedBuilder:  createCustomEmbed,
		ResultHandler: announceCustomResult,
	},
	"invite": voteType{
		EmbedBuilder:  createInviteEmbed,
		ResultHandler: handleInviteResult,
	},
}

const (
	emojiOne   = "1⃣"
	emojiTwo   = "2⃣"
	emojiThree = "3⃣"
	emojiFour  = "4⃣"
	emojiFive  = "5⃣"
	emojiCheck = "✅"
	emojiX     = "❌"
)

func CheckForVote(s *discordgo.Session, r *discordgo.MessageReactionAdd) {
	if r.UserID == s.State.User.ID {
		return
	}
	voteID, err := db.GetVoteFromMessageID(r.MessageID)
	if err == db.ErrNotFound {
		return
	}
	if err != nil {
		auditError(s, r.ChannelID, err)
		return
	}

	s.MessageReactionRemove(r.ChannelID, r.MessageID, r.Emoji.Name, r.UserID)

	var value int
	switch r.Emoji.Name {
	case emojiX:
		value = db.ForceRejectionVote
	case emojiOne:
		value = 1
	case emojiTwo:
		value = 2
	case emojiThree:
		value = 3
	case emojiFour:
		value = 4
	case emojiFive:
		value = 5
	case emojiCheck:
		value = db.NuclearOptionVote
	default:
		auditInfo(s, "Reaction "+r.Emoji.Name+" was added to vote #"+strconv.Itoa(voteID))
		return
	}

	err = db.UpdateVote(voteID, r.UserID, value)

	if err == db.ErrForceRejectionVoteReuse {
		initNewEmbed(config.VoteErrorTitle, config.ErrorForceRejectionReuse, config.ErrorColour).
			SendPM(s, r.UserID)
		return
	}
	if err == db.ErrVoteIsOver {
		initNewEmbed(config.VoteErrorTitle, config.ErrorVoteHasEnded, config.ErrorColour).
			SendPM(s, r.UserID)
		return
	}

	var voteName string
	if err == nil {
		voteName, err = db.GetVoteName(voteID)
	}

	if err != nil {
		auditErrorPM(s, r.UserID, err)
		return
	}

	initNewEmbed(config.VoteSuccessfulTitle, "", config.SuccessColour).
		AddField(config.VoteSuccessfulVoteID, strconv.Itoa(voteID)).
		AddField(config.VoteSuccessfulVoteName, voteName).
		AddField(config.VoteSuccessfulDetectedVote, r.Emoji.Name).
		SendPM(s, r.UserID)
	auditInfo(s, fmt.Sprintf("<@%s> has chosen %s for vote ID %d.", r.UserID, r.Emoji.Name, voteID))

	checkForVoteResult(s, voteID)
}

//TODO Replace with a command.
func VoteSuggestion(s *discordgo.Session, m *discordgo.MessageCreate) {
	s.ChannelMessageDelete(m.ChannelID, m.ID)

	args := strings.SplitN(m.Content, " ", 2)
	if len(args) == 1 {
		initNewEmbed(
			config.VoteSuggestionErrorTitle,
			config.ErrorVoteSuggestionNotEnoughInfo+config.VoteSuggestionNote,
			config.ErrorColour,
		).SendPM(s, m.Author.ID)
		return
	}
	if len(args[1]) > 500 {
		initNewEmbed(
			config.VoteSuggestionErrorTitle,
			config.ErrorVoteSuggestionTooLong+config.VoteSuggestionNote,
			config.ErrorColour,
		).SendPM(s, m.Author.ID)
		return
	}

	switch args[0] {
	case "custom":
		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, m.Author.ID, err)
			return
		}
		id, err := db.CreateCustomVote(msg.ID, args[1])
		if err != nil {
			auditErrorPM(s, m.Author.ID, err)
			return
		}
		auditInfo(s, fmt.Sprintf("Vote ID %d has been created by <@%s>.", id, m.Author.ID))
		s.ChannelMessageEdit(config.VoteChannel, msg.ID, "")
		s.ChannelMessageEditEmbed(config.VoteChannel, msg.ID, createCustomEmbed(id, args[1]))
		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)
	default:
		initNewEmbed(
			config.VoteSuggestionErrorTitle,
			fmt.Sprintf(config.ErrorVoteSuggestionUnknownType, args[1])+config.VoteSuggestionNote,
			config.ErrorColour,
		).SendPM(s, m.Author.ID)
	}
}

func createCustomEmbed(id int, name string) *discordgo.MessageEmbed {
	return newEmbed().SetColour(0x00FFFF).SetTitle("自定义投票Custom Vote").AddField("ID", strconv.Itoa(id)).AddField("内容Content", name).Build()
}

func announceCustomResult(s *discordgo.Session, id int, name string, isPositive bool) {
	s.ChannelMessageSendEmbed(config.AnnounceCustomChannel, showVoteStatus(createCustomEmbed(id, name), isPositive))
}