package discord

import (
	"fmt"
	"sebclem/claptrapbot-go/utils"
	"slices"
	"sort"
	"strings"

	"github.com/bwmarrin/discordgo"
)

func FindNextVoiceIncrement(status *GuildStatus) int {
	numbers := []int{}
	for _, value := range status.AutoVoiceStatus.CreatedChannel {
		numbers = append(numbers, value.Number)
	}
	sort.Ints(numbers)
	next := 1

	for _, value := range numbers {
		if value == next {
			next += 1
		} else {
			break
		}
	}
	return next
}

func GetConnectedUserCountInVoiceChannel(s *discordgo.Session, guildID string, channelID string) (int, error) {
	guildState, err := s.State.Guild(guildID)
	if err != nil {
		logger.Errorw("Fail retreve guild status", err, "GuildId", guildID)
		return -1, err
	}
	count := 0
	for _, vs := range guildState.VoiceStates {
		if vs.ChannelID == channelID {
			count++
		}
	}
	return count, nil
}

func CreateAutoVoiceChannel(s *discordgo.Session, guildStatus *GuildStatus, sourceChannelID string, channelNameTemplate string) (*discordgo.Channel, error) {
	nextNumber := FindNextVoiceIncrement(guildStatus)
	channel, err := s.Channel(sourceChannelID)
	if err != nil {
		logger.Errorw("Fail to retreve channel information", err, "ChannelID", sourceChannelID)
		return nil, err
	}
	newPosition := channel.Position + nextNumber
	channels, err := s.GuildChannels(channel.GuildID)
	if err != nil {
		logger.Errorw("Fail retrevie channel list", err)
		return nil, err
	}
	// TODO Reoder with list index to prevent accumulated error
	for _, thisChannel := range channels {
		if thisChannel.ParentID == channel.ParentID {
			logger.Debug(thisChannel.Position)
		}
		if thisChannel.ParentID == channel.ParentID && thisChannel.Position >= newPosition {
			thisChannel.Position++
		}
	}
	err = s.GuildChannelsReorder(channel.GuildID, channels)
	if err != nil {
		logger.Errorw("Fail to reorde channels", err)
		return nil, err
	}
	channelName := strings.ReplaceAll(channelNameTemplate, "@count", fmt.Sprint(nextNumber))
	created, err := s.GuildChannelCreateComplex(channel.GuildID, discordgo.GuildChannelCreateData{
		Bitrate:              channel.Bitrate,
		Name:                 channelName,
		Position:             newPosition,
		PermissionOverwrites: channel.PermissionOverwrites,
		ParentID:             channel.ParentID,
		RateLimitPerUser:     channel.RateLimitPerUser,
		Type:                 discordgo.ChannelTypeGuildVoice,
		UserLimit:            channel.UserLimit,
	})
	if err != nil {
		logger.Errorw("Fail to create Auto voice channel", err, "GuildId", channel.GuildID)
		return nil, err
	}
	guildStatus.AutoVoiceStatus.CreatedChannel[created.ID] = &AutoVoiceChannelCreated{ID: created.ID, Number: nextNumber, Position: newPosition}
	return created, nil
}

func AutoVoiceChannelDisconect(s *discordgo.Session, guildStatus *GuildStatus, guildID string, channelID string) {
	inVC, err := GetConnectedUserCountInVoiceChannel(s, guildID, channelID)
	if err != nil {
		return
	}
	if inVC == 0 {
		channel, err := s.Channel(channelID)
		if err != nil {
			logger.Errorw("Fail to retreve channel information", err, "ChannelID", channelID)
			return
		}

		logger.Debug("Channel is empty, deleting it.")
		_, err = s.ChannelDelete(channel.ID)
		if err != nil {
			logger.Errorw("Fail to delete auto voice channel",
				err, "GuildId", channel.GuildID,
				"ChannelID", channel.ID)
			return
		}
		channels, err := s.GuildChannels(channel.GuildID)
		if err != nil {
			logger.Errorw("Fail retrevie channel list", err)
			return
		}
		filtered := utils.Filter(channels, func(c *discordgo.Channel) bool { return c.ParentID == channel.ParentID })
		ReoderChannels(s, filtered, guildID)
		delete(guildStatus.AutoVoiceStatus.CreatedChannel, channelID)
	}
}

func ReoderChannels(s *discordgo.Session, channels []*discordgo.Channel, guildID string) error {
	slices.SortFunc(channels, func(a *discordgo.Channel, b *discordgo.Channel) int {
		if a.Position < b.Position {
			return -1
		} else if a.Position > b.Position {
			return 1
		} else {
			return 0
		}
	})
	for i, filtered := range channels {
		filtered.Position = i
	}
	err := s.GuildChannelsReorder(guildID, channels)
	if err != nil {
		logger.Errorw("Fail to reorde channels", err)
		return err
	}
	return nil
}