namespace '/channel' do

  get '' do
    redirect '/channel/list'
  end
  get '/list' do
    channels = Channel.reverse(:updated_at).all()
    erb :'channel/list', :locals => {
      :title => 'List of channels',
      :channels => channels
    }
  end

  get '/create' do
    erb :'channel/create', :locals => {
      :title => 'Create new channel',
      :base_directory => $conf.get('stgm.base_directory')
    }
  end
  post '/create' do
    channel = Channel.create(
      name: params[:channel_name],
      directory_path: params[:channel_dir],
      description: params[:channel_description]
    )

    # create supporting directory structure
    Dir.mkdir(channel.directory_path)
    channel.ensureDirectoryStructure()

    redirect "/channel/#{channel.id}"
  end

  get '/:channel_id' do
    channel = Channel.where(id: params[:channel_id]).first()
    channel_videos = channel.videos_dataset.reverse(:updated_at).limit(10).all()
    erb :'channel/view', :locals => {
      :title => channel.name,
      :channel => channel,
      :channel_videos => channel_videos
    }
  end

  get '/:channel_id/edit' do
    channel = Channel.where(id: params[:channel_id]).first()
    erb :'channel/edit', :locals => {
      :title => "Editing: #{channel.name}",
      :channel => channel
    }
  end
  post '/:channel_id/edit' do
    # get channel model and save old directory path
    channel = Channel.where(id: params[:channel_id]).first()
    old_path = channel.directory_path

    # edit channel model
    channel.update(
      name: params[:channel_name],
      directory_path: params[:channel_dir],
      description: params[:channel_description]
    )

    # edit associate videos' directory paths
    channel.videos.each do |v|
      video_path = v.directory_path.sub(old_path, channel.directory_path)
      v.update(directory_path: video_path)
    end

    # rename channel directory
    File.rename(old_path, channel.directory_path)

    # redirect user
    redirect "/channel/#{channel.id}"
  end

end