require 'open-uri'
require 'net/http'

class LastFmController < ApplicationController
  before_filter :authorize, except: [:connect, :autocomplete]
  
  def connect
    unless params[:sid].nil? or params[:token].nil?
      if user_present?
        lastfm_api_session = LastFM::Auth.get_session(token: params[:token], api_sig: true)
        user = current_user
        user.lastfm_key = lastfm_api_session["session"]['key']
        user.lastfm_username = lastfm_api_session["session"]['name']
        user.save
        return render text: "<script>window.close();</script>"
      else
        return render text: "You Don't Fool Me", status: 403
      end
    else
      return render text: "So Much Trouble In The World", status: 403
    end
  end
  
  def getinfo
    @res = {}
    unless current_user.lastfm_key.nil?
      render json: {
        connected: true,
        username: current_user.lastfm_username
      }
    else
      render json: {
        connected: false,
        lastfm_login_url: "http://www.last.fm/api/auth?api_key=#{LastFM.api_key}"+
          "&cb=http://#{request.host}:#{request.port.to_s}/lastfm/connect/?sid=#{user_session.key}"
      }
    end
  end
  
  def listening
    @res = {}
    if params[:artist].nil? or params[:album].nil? or params[:name].nil?
      return render json: { status: 'bad params' }, status: 403
    end
    if !user_present? or (current_user.lastfm_key.nil? or current_user.lastfm_key == "")
      return render json: {status: 'lastfm account is not connected' }
    end
    r = LastFM::Track.update_now_playing(
      track: params[:name],
      artist: params[:artist],
      album: params[:album],
      trackNumber: params[:position].gsub(/[a-z]/, "").to_i,
      duration: params[:length].to_i,
      sk: current_user.lastfm_key # Auth session key
    )
    render json: { status: r['error'].nil? ? 'success' : r }, status: r['error'].nil? ? 200 : 403
  end
  
  def scrobble
    @res = {}
    if params[:artist].nil? or params[:album].nil? or params[:name].nil?
      return render json: { status: 'bad params' }, status: 403
    end
    if user_present? and track = Track.find_by_id(params[:id])
      Scrobble.create(user: current_user, track: track, scrobbled_at: DateTime.now)
    end
    if !user_present? or (current_user.lastfm_key.nil? or current_user.lastfm_key == "")
      return render json: { status: 'lastfm account is not connected' }
    end
    r = LastFM::Track.scrobble(
      track: params[:name],
      timestamp: Time.now.utc.to_i,
      artist: params[:artist],
      album: params[:album],
      trackNumber: params[:position].gsub(/[a-z]/, "").to_i,
      duration: params[:length].to_i,
      sk: current_user.lastfm_key # Auth session key
    )
    render json: { status: r['error'].nil? ? 'success' : r }, status: r['error'].nil? ? 200 : 403
  end
  
  def self.top_playlist artist
    playlist = Playlist.create(name: "#{artist.name}: Last.fm TOP", artist: artist)
    LastFM::Artist.get_top_tracks(artist: artist.name)["toptracks"]["track"].each do |track|
      tracks = Track.joins(:album, :artists).where(name: track["name"], "track_artists.artist_id" => artist.id)
      PlaylistItem.create(playlist_id: playlist.id, track_id: tracks.first.id) unless tracks.empty?
    end
  end
  
  def autocomplete
    autocomplete = getSuggestions(params[:query])
    return render nothing: true if autocomplete.nil?
    suggestions = []
    autocomplete["response"]["docs"].each do |doc|
      suggestions << doc["artist"] unless suggestions.include?(doc["artist"]) or doc["artist"].nil? or doc['restype'] != 6
    end

    response.headers['Cache-Control'] = 'public, max-age='+1.week.seconds.to_s
    render json: {
      query: params[:query],
      suggestions: suggestions.take(5)
    }
  end
  
private
  
  def getSuggestions query
    return nil if query.nil? or query.strip.empty?
    json = ActiveSupport::JSON.decode(open(
      'http://www.last.fm/search/autocomplete' <<
      '?rows=30&q=' << URI.escape(query)
    ).read)
    json.empty? ? nil : json
  end
end