/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef mozilla_dom_HTMLOptionsCollection_h
#define mozilla_dom_HTMLOptionsCollection_h

#include "mozilla/Attributes.h"
#include "nsIHTMLCollection.h"
#include "nsIDOMHTMLOptionsCollection.h"
#include "nsWrapperCache.h"

#include "mozilla/dom/HTMLOptionElement.h"
#include "mozilla/dom/UnionTypes.h"
#include "mozilla/ErrorResult.h"
#include "nsCOMPtr.h"
#include "nsError.h"
#include "nsGenericHTMLElement.h"
#include "nsTArray.h"

class nsIDOMHTMLOptionElement;

namespace mozilla {
namespace dom {

class HTMLSelectElement;

/**
 * The collection of options in the select (what you get back when you do
 * select.options in DOM)
 */
class HTMLOptionsCollection : public nsIHTMLCollection
                            , public nsIDOMHTMLOptionsCollection
                            , public nsWrapperCache
{
  typedef HTMLOptionElementOrHTMLOptGroupElement HTMLOptionOrOptGroupElement;
public:
  HTMLOptionsCollection(HTMLSelectElement* aSelect);
  virtual ~HTMLOptionsCollection();

  NS_DECL_CYCLE_COLLECTING_ISUPPORTS

  // nsWrapperCache
  using nsWrapperCache::GetWrapperPreserveColor;
  virtual JSObject* WrapObject(JSContext* cx,
                               JS::Handle<JSObject*> scope) MOZ_OVERRIDE;

  // nsIDOMHTMLOptionsCollection interface
  NS_DECL_NSIDOMHTMLOPTIONSCOLLECTION

  // nsIDOMHTMLCollection interface, all its methods are defined in
  // nsIDOMHTMLOptionsCollection

  virtual Element* GetElementAt(uint32_t aIndex);
  virtual nsINode* GetParentObject() MOZ_OVERRIDE;

  NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_AMBIGUOUS(HTMLOptionsCollection,
                                                         nsIHTMLCollection)

  // Helpers for HTMLSelectElement
  /**
   * Insert an option
   * @param aOption the option to insert
   * @param aIndex the index to insert at
   */
  void InsertOptionAt(mozilla::dom::HTMLOptionElement* aOption, uint32_t aIndex)
  {
    mElements.InsertElementAt(aIndex, aOption);
  }

  /**
   * Remove an option
   * @param aIndex the index of the option to remove
   */
  void RemoveOptionAt(uint32_t aIndex)
  {
    mElements.RemoveElementAt(aIndex);
  }

  /**
   * Get the option at the index
   * @param aIndex the index
   * @param aReturn the option returned [OUT]
   */
  mozilla::dom::HTMLOptionElement* ItemAsOption(uint32_t aIndex)
  {
    return mElements.SafeElementAt(aIndex, nullptr);
  }

  /**
   * Clears out all options
   */
  void Clear()
  {
    mElements.Clear();
  }

  /**
   * Append an option to end of array
   */
  void AppendOption(mozilla::dom::HTMLOptionElement* aOption)
  {
    mElements.AppendElement(aOption);
  }

  /**
   * Drop the reference to the select.  Called during select destruction.
   */
  void DropReference();

  /**
   * Finds the index of a given option element.
   * If the option isn't part of the collection, return NS_ERROR_FAILURE
   * without setting aIndex.
   *
   * @param aOption the option to get the index of
   * @param aStartIndex the index to start looking at
   * @param aForward TRUE to look forward, FALSE to look backward
   * @return the option index
   */
  nsresult GetOptionIndex(Element* aOption,
                          int32_t aStartIndex, bool aForward,
                          int32_t* aIndex);

  HTMLOptionElement* GetNamedItem(const nsAString& aName) const;
  virtual JSObject* NamedItem(JSContext* aCx, const nsAString& aName,
                              ErrorResult& error) MOZ_OVERRIDE;

  void Add(const HTMLOptionOrOptGroupElement& aElement,
           const Nullable<HTMLElementOrLong>& aBefore,
           ErrorResult& aError);
  void Remove(int32_t aIndex, ErrorResult& aError);
  int32_t GetSelectedIndex(ErrorResult& aError);
  void SetSelectedIndex(int32_t aSelectedIndex, ErrorResult& aError);
  void IndexedSetter(uint32_t aIndex, nsIDOMHTMLOptionElement* aOption,
                     ErrorResult& aError)
  {
    aError = SetOption(aIndex, aOption);
  }
  virtual void GetSupportedNames(nsTArray<nsString>& aNames) MOZ_OVERRIDE;

private:
  /** The list of options (holds strong references).  This is infallible, so
   * various members such as InsertOptionAt are also infallible. */
  nsTArray<nsRefPtr<mozilla::dom::HTMLOptionElement> > mElements;
  /** The select element that contains this array */
  HTMLSelectElement* mSelect;
};

} // namespace dom
} // namespace mozilla

#endif // mozilla_dom_HTMLOptionsCollection_h
