class Vkontakte
	
	qr: []
	
	constructor: (@api_id) ->
	
	init: ->
		VK.init
			apiId: @api_id
			nameTransportPath: '/xd_receiver.html'
		
		VK.Auth.getLoginStatus this.authInfo
	
	authInfo: (response) ->
		if typeof response isnt 'undefined' and response.session
			session.setVkParams response.session
			
			$('#vk_login, .auth_notice').hide()
			$('#vk_logout').css display: 'block'
			
			$('#search_field').focus() if $('#search_field').length > 0
				
			session.query '/user/auth', {}, (ar) ->
				if ar.newbie
					VK.Api.call 'getVariable', key: 1281, (r) ->
						Session.query '/user/update', name: r.response, (ar2) ->
							session.user = ar2.user
							$('#header-container .hello .greating')
								.text 'Hi there, ' +(if session.user.name then session.user.name else '%username%')+ '!'
				else
					session.user = ar.user
				
				$('#header-container .hello .greating')
					.text 'Hi there, ' +( if session.user.name then session.user.name else '%username%')+ '!'
		else
			$('#vk_login, .auth_notice').css display: 'block'
			$('#vk_logout').hide()
	
	loadTracksData: (artist, track, duration, callback) ->
		track_prepared = track.replace(/\(.*\)/i, '').split('/')[0];
		query = artist +' '+ track_prepared;
		if @qr[query]?
			callback @qr[query]
		else
			VK.Api.call 'audio.search', q: query, (r) ->
				url = this.matchPerfectResult r.response, artist, track, duration
				@qr[query] = url;
				callback url
	
	matchPerfectResult: (data, artist, track, duration) ->
		duration = duration.split ':'

		duration = parseInt(duration[0], 10) * 60 + parseInt(duration[1], 10)
		best_score = 0;
		best_result = null;
		for item in data
			score = 0;
			item.artist = item.artist.trim();
			item.title = item.title.trim();
			
			if item.artist == artist
				score += 10
			else if item.artist.split(artist).length is 2
				score += 5
			else if item.title.split(artist).length is 2
				score += 4
			
			if item.title == track
				score += 10
			else if item.title.split(track).length is 2
				score += 5
			
			if parseInt(item.duration, 10) == duration
				score += 15
			else
				delta = Math.abs parseInt(item.duration, 10) - duration
				score += (10 - delta) if delta < 10
			
			if score > best_score
				best_score = score
				best_result = item
			
			if score is 35
				return best_result.url

		return best_result.url

$ ->
	$('#vk_login').click ->
		VK.Auth.login vkontakte.authInfo, 8
	$('#vk_logout').click ->
		VK.Auth.logout vkontakte.authInfo