Class draft

README.md

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+# Vkontakte (VK.com) API music search tool
+
+Don't forget to log in to [vk.com API](http://vk.com/developers.php?oid=-17680044&p=Open_API)
+
+```coffeescript
+vk_music = new VkontakteMusic
+url = vk_music.search "Kasabian", "L.S.F. (Lost Souls Forever)", 197
+
+audio = document.createElement "audio"
+audio.setAttribute "src", url
+document.getElementsByTagName("body")[0].appendChild audio
+audio.play()
+```

vkontakte_music.coffee

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+class VkontakteMusic
+  query_results = {}
+  
+  search: (artist, track, duration, callback) ->
+    query = this.prepareQuery artist, track
+    if @query_results[query]
+      callback @query_results[query]
+    that = this
+    VK.Api.call 'audio.search', q: query, (r) ->
+      best_result = that.matchPerfectResult(r.response)
+      that.query_results[query] = best_result
+      callback best_result
+  
+  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
+      if typeof item is 'object'
+        score = 0;
+        item.artist = item.artist.trim();
+        item.title = item.title.trim();
+        if item.artist.length > 0
+          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.artist.length > 0
+          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.url
+        if score is 35
+          return best_result
+    best_result
+  
+  prepareQuery: (artist, track) ->
+    artist+" "+track.replace(/\(.*\)/i, '').split('/')[0]
+  
+  trim: (str) ->
+  	while str.indexOf('  ') != -1
+  		str = str.replace('  ', ' ')
+  	if str.charAt(0) == ' '
+  		str = str.substring 1
+  	if str.charAt(str.length - 1) == ' '
+  		str = str.substring(0, str.length - 1)
+  	str