/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsTreeUtils.h"

#include "ChildIterator.h"
#include "mozilla/dom/Element.h"
#include "nsAtom.h"
#include "nsCRT.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsNameSpaceManager.h"
#include "nsReadableUtils.h"

using namespace mozilla;

nsresult nsTreeUtils::TokenizeProperties(const nsAString& aProperties,
                                         AtomArray& aPropertiesArray) {
  nsAString::const_iterator end;
  aProperties.EndReading(end);

  nsAString::const_iterator iter;
  aProperties.BeginReading(iter);

  do {
    // Skip whitespace
    while (iter != end && nsCRT::IsAsciiSpace(*iter)) {
      ++iter;
    }

    // If only whitespace, we're done
    if (iter == end) {
      break;
    }

    // Note the first non-whitespace character
    nsAString::const_iterator first = iter;

    // Advance to the next whitespace character
    while (iter != end && !nsCRT::IsAsciiSpace(*iter)) {
      ++iter;
    }

    // XXX this would be nonsensical
    NS_ASSERTION(iter != first, "eh? something's wrong here");
    if (iter == first) {
      break;
    }

    RefPtr<nsAtom> atom = NS_Atomize(Substring(first, iter));
    aPropertiesArray.AppendElement(atom);
  } while (iter != end);

  return NS_OK;
}

nsIContent* nsTreeUtils::GetImmediateChild(nsIContent* aContainer,
                                           nsAtom* aTag) {
  dom::FlattenedChildIterator iter(aContainer);
  for (nsIContent* child = iter.GetNextChild(); child;
       child = iter.GetNextChild()) {
    if (child->IsXULElement(aTag)) {
      return child;
    }
    // <slot> is in the flattened tree, but <tree> code is used to work with
    // <xbl:children> which is not, so recurse in <slot> here.
    if (child->IsHTMLElement(nsGkAtoms::slot)) {
      if (nsIContent* c = GetImmediateChild(child, aTag)) {
        return c;
      }
    }
  }

  return nullptr;
}

nsIContent* nsTreeUtils::GetDescendantChild(nsIContent* aContainer,
                                            nsAtom* aTag) {
  dom::FlattenedChildIterator iter(aContainer);
  for (nsIContent* child = iter.GetNextChild(); child;
       child = iter.GetNextChild()) {
    if (child->IsXULElement(aTag)) {
      return child;
    }

    child = GetDescendantChild(child, aTag);
    if (child) {
      return child;
    }
  }

  return nullptr;
}

nsresult nsTreeUtils::UpdateSortIndicators(dom::Element* aColumn,
                                           const nsAString& aDirection) {
  aColumn->SetAttr(kNameSpaceID_None, nsGkAtoms::sortDirection, aDirection,
                   true);
  aColumn->SetAttr(kNameSpaceID_None, nsGkAtoms::sortActive, u"true"_ns, true);

  // Unset sort attribute(s) on the other columns
  nsCOMPtr<nsIContent> parentContent = aColumn->GetParent();
  if (parentContent && parentContent->NodeInfo()->Equals(nsGkAtoms::treecols,
                                                         kNameSpaceID_XUL)) {
    for (nsINode* childContent = parentContent->GetFirstChild(); childContent;
         childContent = childContent->GetNextSibling()) {
      if (childContent != aColumn &&
          childContent->NodeInfo()->Equals(nsGkAtoms::treecol,
                                           kNameSpaceID_XUL)) {
        childContent->AsElement()->UnsetAttr(kNameSpaceID_None,
                                             nsGkAtoms::sortDirection, true);
        childContent->AsElement()->UnsetAttr(kNameSpaceID_None,
                                             nsGkAtoms::sortActive, true);
      }
    }
  }

  return NS_OK;
}

nsresult nsTreeUtils::GetColumnIndex(dom::Element* aColumn, int32_t* aResult) {
  nsIContent* parentContent = aColumn->GetParent();
  if (parentContent && parentContent->NodeInfo()->Equals(nsGkAtoms::treecols,
                                                         kNameSpaceID_XUL)) {
    int32_t colIndex = 0;

    for (nsINode* childContent = parentContent->GetFirstChild(); childContent;
         childContent = childContent->GetNextSibling()) {
      if (childContent->NodeInfo()->Equals(nsGkAtoms::treecol,
                                           kNameSpaceID_XUL)) {
        if (childContent == aColumn) {
          *aResult = colIndex;
          return NS_OK;
        }
        ++colIndex;
      }
    }
  }

  *aResult = -1;
  return NS_OK;
}