<!--
  -- Copyright 2013 The Chromium Authors. All rights reserved.
  -- Use of this source code is governed by a BSD-style license that can be
  -- found in the LICENSE file.
  -->

<polymer-element name="kb-key-sequence"
    attributes="keys hintTexts keyCodes invert">
  <template>
    <style>
      :host {
        display: none;
      }
    </style>
  </template>
  <script>
    (function() {

      var metadata = null;

      function getKeyCodeAndModifiers(keyCodeIndex) {
        if (!metadata)
          metadata = document.createElement('kb-key-codes'); 
        return metadata.GetKeyCodeAndModifiers(keyCodeIndex);
      }

      Polymer('kb-key-sequence', {
        /**
         * Generates the DOM structure to replace (expand) this kb-key-sequence.
         */
        generateDom: function() {
          var replacement = document.createDocumentFragment();
          var newKeys = this.getAttribute('keys');
          var newHintTexts = this.getAttribute('hintTexts');
          var keyCodes = this.getAttribute('hintCodes') || newKeys;
          var invert = this.getAttribute('invert');
          if (newKeys) {
            if (newHintTexts && newKeys.length != newHintTexts.length) {
              console.error('keys and hintTexts do not match');
              return;
            }
            if (keyCodes && newKeys.length != keyCodes.length) {
               console.error('keys and keyCodes do not match');
              return;
            }

            for (var i = 0; i < newKeys.length; i++) {
              var key = document.createElement('kb-key');
              key.innerText = newKeys[i];
              key.accents = newKeys[i];
              if (newHintTexts)
                key.hintText = newHintTexts[i];
              var keyCodeIndex = keyCodes[i];
              if (invert) {
                key.invert = true;
                key.char = newKeys[i];
                keyCodeIndex = key.hintText;
              }
              var state = getKeyCodeAndModifiers(keyCodeIndex);
              if (state) {
                key.keyCode = state.keyCode;
                key.keyName = state.keyName;
                key.shiftModifier = state.shiftModifier;
              }
              replacement.appendChild(key);
            }
          }
          return replacement;
        }
      });
    })();
  </script>
</polymer-element>