<!DOCTYPE html>
<!--
Copyright (c) 2014 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.
-->

<link rel="import" href="/base/settings.html">
<link rel="import" href="/ui/base/ui.html">

<style>
* /deep/ .labeled-checkbox {
  display: flex;
  white-space: nowrap;
}
</style>

<script>
'use strict';

tr.exportTo('tr.ui.b', function() {

  function createSpan(opt_dictionary) {
    var spanEl = document.createElement('span');
    if (opt_dictionary) {
      if (opt_dictionary.className)
        spanEl.className = opt_dictionary.className;
      if (opt_dictionary.textContent)
        spanEl.textContent = opt_dictionary.textContent;
      if (opt_dictionary.parent)
        opt_dictionary.parent.appendChild(spanEl);
      if (opt_dictionary.bold)
        spanEl.style.fontWeight = 'bold';
      if (opt_dictionary.marginLeft)
        spanEl.style.marginLeft = opt_dictionary.marginLeft;
      if (opt_dictionary.marginRight)
        spanEl.style.marginRight = opt_dictionary.marginRight;
      if (opt_dictionary.backgroundColor)
        spanEl.style.backgroundColor = opt_dictionary.backgroundColor;
      if (opt_dictionary.color)
        spanEl.style.color = opt_dictionary.color;
    }
    return spanEl;
  };

  function createDiv(opt_dictionary) {
    var divEl = document.createElement('div');
    if (opt_dictionary) {
      if (opt_dictionary.className)
        divEl.className = opt_dictionary.className;
      if (opt_dictionary.parent)
        opt_dictionary.parent.appendChild(divEl);
      if (opt_dictionary.textContent)
        divEl.textContent = opt_dictionary.textContent;
      if (opt_dictionary.maxWidth)
        divEl.style.maxWidth = opt_dictionary.maxWidth;
    }
    return divEl;
  };

  function createScopedStyle(styleContent) {
    var styleEl = document.createElement('style');
    styleEl.scoped = true;
    styleEl.innerHTML = styleContent;
    return styleEl;
  }

  function valuesEqual(a, b) {
    if (a instanceof Array && b instanceof Array)
      return a.length === b.length && JSON.stringify(a) === JSON.stringify(b);
    return a === b;
  }

  function createSelector(
      targetEl, targetElProperty,
      settingsKey, defaultValue,
      items, opt_namespace) {
    var defaultValueIndex;
    for (var i = 0; i < items.length; i++) {
      var item = items[i];
      if (valuesEqual(item.value, defaultValue)) {
        defaultValueIndex = i;
        break;
      }
    }
    if (defaultValueIndex === undefined)
      throw new Error('defaultValue must be in the items list');

    var selectorEl = document.createElement('select');
    selectorEl.addEventListener('change', onChange);
    for (var i = 0; i < items.length; i++) {
      var item = items[i];
      var optionEl = document.createElement('option');
      optionEl.textContent = item.label;
      optionEl.targetPropertyValue = item.value;
      selectorEl.appendChild(optionEl);
    }
    function onChange(e) {
      var value = selectorEl.selectedOptions[0].targetPropertyValue;
      tr.b.Settings.set(settingsKey, value, opt_namespace);
      targetEl[targetElProperty] = value;
    }
    var oldSetter = targetEl.__lookupSetter__('selectedIndex');
    selectorEl.__defineGetter__('selectedValue', function(v) {
      return selectorEl.children[selectorEl.selectedIndex].targetPropertyValue;
    });
    selectorEl.__defineSetter__('selectedValue', function(v) {
      for (var i = 0; i < selectorEl.children.length; i++) {
        var value = selectorEl.children[i].targetPropertyValue;
        if (valuesEqual(value, v)) {
          var changed = selectorEl.selectedIndex != i;
          if (changed) {
            selectorEl.selectedIndex = i;
            onChange();
          }
          return;
        }
      }
      throw new Error('Not a valid value');
    });

    var initialValue = tr.b.Settings.get(
        settingsKey, defaultValue, opt_namespace);
    var didSet = false;
    for (var i = 0; i < selectorEl.children.length; i++) {
      if (valuesEqual(selectorEl.children[i].targetPropertyValue,
          initialValue)) {
        didSet = true;
        targetEl[targetElProperty] = initialValue;
        selectorEl.selectedIndex = i;
        break;
      }
    }
    if (!didSet) {
      selectorEl.selectedIndex = defaultValueIndex;
      targetEl[targetElProperty] = defaultValue;
    }

    return selectorEl;
  }

  function createEditCategorySpan(optionGroupEl, targetEl) {
    var spanEl = createSpan({className: 'edit-categories'});
    spanEl.textContent = 'Edit categories';
    spanEl.classList.add('labeled-option');

    spanEl.addEventListener('click', function() {
      targetEl.onClickEditCategories();
    });
    return spanEl;
  }

  function createOptionGroup(targetEl, targetElProperty,
                             settingsKey, defaultValue,
                             items) {
    function onChange() {
      var value = [];
      if (this.value.length)
        value = this.value.split(',');
      tr.b.Settings.set(settingsKey, value);
      targetEl[targetElProperty] = value;
    }

    var optionGroupEl = createSpan({className: 'labeled-option-group'});
    var initialValue = tr.b.Settings.get(settingsKey, defaultValue);
    for (var i = 0; i < items.length; ++i) {
      var item = items[i];
      var id = 'category-preset-' + item.label.replace(/ /g, '-');

      var radioEl = document.createElement('input');
      radioEl.type = 'radio';
      radioEl.setAttribute('id', id);
      radioEl.setAttribute('name', 'category-presets-group');
      radioEl.setAttribute('value', item.value);
      radioEl.addEventListener('change', onChange.bind(radioEl, targetEl,
                                                       targetElProperty,
                                                       settingsKey));
      if (valuesEqual(initialValue, item.value))
        radioEl.checked = true;

      var labelEl = document.createElement('label');
      labelEl.textContent = item.label;
      labelEl.setAttribute('for', id);

      var spanEl = createSpan({className: 'labeled-option'});
      spanEl.appendChild(radioEl);
      spanEl.appendChild(labelEl);

      spanEl.__defineSetter__('checked', function(opt_bool) {
        var changed = radioEl.checked !== (!!opt_bool);
        if (!changed)
          return;

        radioEl.checked = !!opt_bool;
        onChange();
      });
      spanEl.__defineGetter__('checked', function() {
        return radioEl.checked;
      });

      optionGroupEl.appendChild(spanEl);
    }
    optionGroupEl.appendChild(createEditCategorySpan(optionGroupEl, targetEl));
    // Since this option group element is not yet added to the tree,
    // querySelector will fail during updateEditCategoriesStatus_ call.
    // Hence, creating the element with the 'expanded' classlist category
    // added, if last selected value was 'Manual' selection.
    if (!initialValue.length)
      optionGroupEl.classList.add('categories-expanded');
    targetEl[targetElProperty] = initialValue;

    return optionGroupEl;
  }

  var nextCheckboxId = 1;
  function createCheckBox(targetEl, targetElProperty,
                          settingsKey, defaultValue,
                          label) {
    var buttonEl = document.createElement('input');
    buttonEl.type = 'checkbox';

    var initialValue = tr.b.Settings.get(settingsKey, defaultValue);
    buttonEl.checked = !!initialValue;
    if (targetEl)
      targetEl[targetElProperty] = initialValue;

    function onChange() {
      tr.b.Settings.set(settingsKey, buttonEl.checked);
      if (targetEl)
        targetEl[targetElProperty] = buttonEl.checked;
    }

    buttonEl.addEventListener('change', onChange);

    var id = '#checkbox-' + nextCheckboxId++;

    var spanEl = createSpan({className: 'labeled-checkbox'});
    buttonEl.setAttribute('id', id);

    var labelEl = document.createElement('label');
    labelEl.textContent = label;
    labelEl.setAttribute('for', id);
    spanEl.appendChild(buttonEl);
    spanEl.appendChild(labelEl);

    spanEl.__defineSetter__('checked', function(opt_bool) {
      var changed = buttonEl.checked !== (!!opt_bool);
      if (!changed)
        return;

      buttonEl.checked = !!opt_bool;
      onChange();
    });
    spanEl.__defineGetter__('checked', function() {
      return buttonEl.checked;
    });

    return spanEl;
  }

  function isElementAttachedToDocument(el) {
    var cur = el;
    while (cur.parentNode)
      cur = cur.parentNode;
    return (cur === el.ownerDocument || cur.nodeName === '#document-fragment');
  }

  function asHTMLOrTextNode(value, opt_ownerDocument) {
    if (value instanceof Node)
      return value;
    var ownerDocument = opt_ownerDocument || document;
    return ownerDocument.createTextNode(value);
  }

  return {
    createSpan: createSpan,
    createDiv: createDiv,
    createScopedStyle: createScopedStyle,
    createSelector: createSelector,
    createOptionGroup: createOptionGroup,
    createCheckBox: createCheckBox,
    isElementAttachedToDocument: isElementAttachedToDocument,
    asHTMLOrTextNode: asHTMLOrTextNode
  };
});
</script>