package service

import (
	"errors"

	"git.cliffbreak.de/Cliffbreak/tsviewer/features/api/channel"
	"github.com/multiplay/go-ts3"
)

func (s Service) Channel(id int) (*channel.Channel, error) {
	channels, err := s.TSClient.Server.ChannelList()
	if err != nil {
		return nil, err
	}

	var c *channel.Channel

	for _, channel := range channels {
		if channel.ID == id {
			c = convertChannel(channel)
			break
		}
	}

	if c == nil {
		return nil, errors.New("channel does not exist")
	}

	return c, nil
}

func (s Service) Channels() ([]*channel.Channel, error) {
	channels, err := s.TSClient.Server.ChannelList()
	if err != nil {
		return nil, err
	}

	var cc []*channel.Channel

	for i, channel := range channels {
		if channel == nil {
			continue
		}

		if channel.ParentID == 0 {
			cc = append(cc, convertChannel(channel))
			removeItem(&channels, i)
		}
	}

	for _, c := range cc {
		addSubChannels(c, &channels)
	}

	return cc, nil
}

func convertChannel(c *ts3.Channel) *channel.Channel {
	return &channel.Channel{
		ID:                   c.ID,
		Subchannels:          []channel.Channel{},
		Name:                 c.ChannelName,
		TotalClients:         c.TotalClients,
		NeededSubscribePower: c.NeededSubscribePower,
	}
}

func removeItem(slice *[]*ts3.Channel, id int) {
	ss := *slice
	length := len(ss)

	if length < id+1 {
		ss = nil
	} else if length == id+1 {
		ss = ss[id-1:]
	} else if length > id+1 {
		ss = append(ss[:id], ss[id+1:]...)
	}

	*slice = ss
}

func addSubChannels(c *channel.Channel, channels *[]*ts3.Channel) {
	for i, channel := range *channels {
		if c.ID == channel.ParentID {
			removeItem(channels, i)
			subChannel := convertChannel(channel)
			addSubChannels(subChannel, channels)
			c.Subchannels = append(c.Subchannels, *subChannel)
		}
	}
}