/* 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 "ia2AccessibleAction.h"

#include "AccessibleAction_i.c"

#include "AccessibleWrap.h"
#include "IUnknownImpl.h"
#include "MsaaAccessible.h"
#include "Relation.h"

using namespace mozilla::a11y;

Accessible* ia2AccessibleAction::Acc() {
  return static_cast<MsaaAccessible*>(this)->Acc();
}

// IUnknown

STDMETHODIMP
ia2AccessibleAction::QueryInterface(REFIID iid, void** ppv) {
  if (!ppv) return E_INVALIDARG;

  *ppv = nullptr;

  if (IID_IAccessibleAction == iid) {
    *ppv = static_cast<IAccessibleAction*>(this);
    (reinterpret_cast<IUnknown*>(*ppv))->AddRef();
    return S_OK;
  }

  return E_NOINTERFACE;
}

// IAccessibleAction

STDMETHODIMP
ia2AccessibleAction::nActions(long* aActionCount) {
  if (!aActionCount) return E_INVALIDARG;

  *aActionCount = 0;

  Accessible* acc = Acc();
  if (!acc) return CO_E_OBJNOTCONNECTED;

  *aActionCount = acc->ActionCount();
  Relation customActions(acc->RelationByType(RelationType::ACTION));
  while (Accessible* target = customActions.Next()) {
    if (target->HasPrimaryAction()) {
      (*aActionCount)++;
    }
  }

  return S_OK;
}

STDMETHODIMP
ia2AccessibleAction::doAction(long aActionIndex) {
  Accessible* acc = Acc();
  if (!acc) return CO_E_OBJNOTCONNECTED;

  uint8_t index = static_cast<uint8_t>(aActionIndex);

  if (index < acc->ActionCount()) {
    DebugOnly<bool> success = acc->DoAction(aActionIndex);
    MOZ_ASSERT(success, "Failed to perform action");
    return S_OK;
  }

  // Check for custom actions.
  Relation customActions(acc->RelationByType(RelationType::ACTION));
  uint8_t actionIndex = acc->ActionCount();
  while (Accessible* target = customActions.Next()) {
    if (target->HasPrimaryAction()) {
      MOZ_ASSERT(target->ActionCount() > 0);
      if (actionIndex == index) {
        DebugOnly<bool> success = target->DoAction(0);
        MOZ_ASSERT(success, "Failed to perform action");
        return S_OK;
      }
      actionIndex++;
    }
  }

  return E_INVALIDARG;
}

STDMETHODIMP
ia2AccessibleAction::get_description(long aActionIndex, BSTR* aDescription) {
  return get_localizedName(aActionIndex, aDescription);
}

STDMETHODIMP
ia2AccessibleAction::get_keyBinding(long aActionIndex, long aNumMaxBinding,
                                    BSTR** aKeyBinding, long* aNumBinding) {
  if (!aKeyBinding) return E_INVALIDARG;
  *aKeyBinding = nullptr;

  if (!aNumBinding) return E_INVALIDARG;
  *aNumBinding = 0;

  if (aActionIndex != 0 || aNumMaxBinding < 1) return E_INVALIDARG;

  Accessible* acc = Acc();
  if (!acc) return CO_E_OBJNOTCONNECTED;

  // Expose KeyboardShortcut if it's not exposed via MSAA accKeyboardShortcut.
  LocalAccessible* localAcc = acc->AsLocal();
  if (!localAcc) {
    // RemoteAccessibles can't have a KeyboardShortcut.
    return S_FALSE;
  }

  KeyBinding keyBinding = acc->AccessKey();
  if (keyBinding.IsEmpty()) {
    // In this case, KeyboardShortcut will be exposed via MSAA
    // accKeyboardShortcut.
    return S_FALSE;
  }

  // MSAA accKeyboardShortcut will expose AccessKey.
  keyBinding = localAcc->KeyboardShortcut();
  if (keyBinding.IsEmpty()) return S_FALSE;

  nsAutoString keyStr;
  keyBinding.ToString(keyStr);

  *aKeyBinding = static_cast<BSTR*>(::CoTaskMemAlloc(sizeof(BSTR*)));
  if (!*aKeyBinding) return E_OUTOFMEMORY;

  *(aKeyBinding[0]) = ::SysAllocStringLen(keyStr.get(), keyStr.Length());
  if (!*(aKeyBinding[0])) {
    ::CoTaskMemFree(*aKeyBinding);
    return E_OUTOFMEMORY;
  }

  *aNumBinding = 1;
  return S_OK;
}

STDMETHODIMP
ia2AccessibleAction::get_name(long aActionIndex, BSTR* aName) {
  if (!aName) return E_INVALIDARG;

  *aName = nullptr;

  Accessible* acc = Acc();
  if (!acc) return CO_E_OBJNOTCONNECTED;

  nsAutoString name;
  uint8_t index = static_cast<uint8_t>(aActionIndex);
  if (index < acc->ActionCount()) {
    acc->ActionNameAt(aActionIndex, name);
  } else {
    // Check for custom actions.
    Relation customActions(acc->RelationByType(RelationType::ACTION));
    uint8_t actionIndex = acc->ActionCount();
    while (Accessible* target = customActions.Next()) {
      if (target->HasPrimaryAction()) {
        MOZ_ASSERT(target->ActionCount() > 0);
        if (actionIndex == index) {
          name.AssignLiteral("custom");
          nsAutoString domNodeId;
          target->DOMNodeID(domNodeId);
          if (!domNodeId.IsEmpty()) {
            name.AppendPrintf("_%s", NS_ConvertUTF16toUTF8(domNodeId).get());
          }
          break;
        }
        actionIndex++;
      }
    }
  }

  if (name.IsEmpty()) return E_INVALIDARG;

  *aName = ::SysAllocStringLen(name.get(), name.Length());
  return *aName ? S_OK : E_OUTOFMEMORY;
}

STDMETHODIMP
ia2AccessibleAction::get_localizedName(long aActionIndex,
                                       BSTR* aLocalizedName) {
  if (!aLocalizedName) return E_INVALIDARG;
  *aLocalizedName = nullptr;

  Accessible* acc = Acc();
  if (!acc) return CO_E_OBJNOTCONNECTED;

  nsAutoString description;
  uint8_t index = static_cast<uint8_t>(aActionIndex);

  if (aActionIndex < acc->ActionCount()) {
    acc->ActionDescriptionAt(index, description);
  } else {
    // Check for custom actions.
    Relation customActions(acc->RelationByType(RelationType::ACTION));
    uint8_t actionIndex = acc->ActionCount();
    while (Accessible* target = customActions.Next()) {
      if (target->HasPrimaryAction()) {
        MOZ_ASSERT(target->ActionCount() > 0);
        if (actionIndex == index) {
          target->Name(description);
          break;
        }
        actionIndex++;
      }
    }
  }

  if (description.IsEmpty()) return S_FALSE;

  *aLocalizedName =
      ::SysAllocStringLen(description.get(), description.Length());
  return *aLocalizedName ? S_OK : E_OUTOFMEMORY;
}