require 'nokogiri'
require 'net/http'
require 'open-uri'
require 'digest/sha2'

require File.join(File.dirname(__FILE__),'lib-ampache')

class AmpacheRuby
    
    
    def initialize(host,user,psw)
        uri = URI.parse(host)
        @host = uri.host
        @path = uri.path
        @user = user
        @psw = psw
        @token = nil
        @token = getAuthToken(user,psw)
    end

    attr_accessor :host, :path, :user, :psw, :token, :playlist

    def getAuthToken(user,psw)
        action= "handshake"
        # auth string
        key =  Digest::SHA2.new << psw 
        time = Time.now.to_i.to_s
        psk = Digest::SHA2.new << (time + key.to_s)

        args = { 'auth' => psk, 'timestamp'=> time, 'version' => '350001', 'user' => user}
        doc = callApiMethod(action,args);

        return doc.at("auth").content
    end

    def callApiMethod( method, args={})
        args['auth'] ||= token if token
        url = path + "/server/xml.server.php?action=#{method}&#{args.keys.collect { |k| "#{k}=#{args[k]}"}.join('&')}" 
        response = Net::HTTP.get_response(host,url )
        return Nokogiri::XML(response.body)
    end


    def artists(name = nil)
        args = {}
        args = { 'filter' => name.to_s } if name  # artist search 
        artists = []
        doc = callApiMethod("artists",args)
        doc.xpath("//artist").each do |a|
            artists << AmpacheArtist.new(self,a['id'] ,a.at("name").content)
        end
        return artists
    end

    def albums(artist)
        albums = []
        args = { 'filter' => artist.uid.to_s }
        doc = callApiMethod("artist_albums",args)
        doc.xpath("//album").each do |a|
            albums  << AmpacheAlbum.new(self,a['id'], a.at("name").content, artist)
        end
        return albums
    end

    def songs(album)
        songs = []
        args = { 'filter' => album.uid.to_s }
        doc = callApiMethod("album_songs",args)
        doc.xpath("//song").each do |s|
            songs << AmpacheSong.new(self,s['id'], s.at("title").content, album.artist, album, s.at("url").content)
        end
        return songs
    end
    
end