require 'uri'
require 'net/http'

class MusicController < ApplicationController
    def get_current_track
        if Rails.cache.exist?("current_track")
            return Rails.cache.read("current_track")
        end

        uri = URI.parse('https://ws.audioscrobbler.com/2.0/')
        params = {
            :method => 'user.getrecenttracks',
            :user => Rails.application.credentials.lastfm.username,
            :format => 'json',
            :nowplaying => 'true',
            :api_key => Rails.application.credentials.lastfm.api_key
        }
        uri.query = URI.encode_www_form(params)
        req = Net::HTTP::Get.new(uri.to_s)
        res = Net::HTTP.start(uri.host, uri.port, use_ssl: true) {|http|
            http.request(req)
        }
        data = JSON.parse(res.body)
        track_data = data["recenttracks"]["track"][0]
        image = defined?(track_data["image"][-1]) ? track_data["image"][-1] : false
        now_playing = false
        if track_data["@attr"] != nil
          now_playing = track_data["@attr"]["nowplaying"] == "true"
        end

        current_track = {
            :title => track_data["name"],
            :artist => track_data["artist"]["#text"],
            :url => track_data["url"],
            :image => image["#text"],
            :header => if now_playing then "Now Playing" else "Last Track" end
        }
        return current_track
    end

    def get_top_tracks
        if Rails.cache.exist?("top_tracks")
            return Rails.cache.read("top_tracks")
        end

        uri = URI.parse('https://ws.audioscrobbler.com/2.0/')
        params = {
            :method => 'user.gettoptracks',
            :user => Rails.application.credentials.lastfm.username,
            :format => 'json',
            :period => '1month',
            :limit => 10,
            :api_key => Rails.application.credentials.lastfm.api_key
        }
        uri.query = URI.encode_www_form(params)
        req = Net::HTTP::Get.new(uri.to_s)
        res = Net::HTTP.start(uri.host, uri.port, use_ssl: true) {|http|
            http.request(req)
        }
        data = JSON.parse(res.body)
        top_tracks = []
        data["toptracks"]["track"].each do |track|
          top_tracks.push({
            :title => track["name"],
            :artist => track["artist"]["name"],
            :url => track["url"],
            :plays => track["playcount"]
          })
        end

        return top_tracks
    end

    def index
        @current_track = get_current_track
        @top_tracks = get_top_tracks
    end
end