// Copyright 2010-2021, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "win32/tip/tip_private_context.h"

#include <msctf.h>

#include <memory>

#include "client/client.h"
#include "client/client_interface.h"
#include "protocol/commands.pb.h"
#include "win32/base/config_snapshot.h"
#include "win32/base/deleter.h"
#include "win32/base/input_state.h"
#include "win32/base/keyboard.h"
#include "win32/base/surrogate_pair_observer.h"
#include "win32/tip/tip_text_service.h"
#include "win32/tip/tip_ui_element_manager.h"

namespace mozc {
namespace win32 {
namespace tsf {

using ::mozc::client::ClientFactory;
using ::mozc::client::ClientInterface;
using ::mozc::commands::Capability;
using ::mozc::commands::Output;

class TipPrivateContext::InternalState {
 public:
  InternalState()
      : client_(ClientFactory::NewClient()) {}
  std::unique_ptr<client::ClientInterface> client_;
  SurrogatePairObserver surrogate_pair_observer_;
  commands::Output last_output_;
  VirtualKey last_down_key_;
  InputBehavior input_behavior_;
  TipUiElementManager ui_element_manager_;
  VKBackBasedDeleter deleter_;
};

TipPrivateContext::TipPrivateContext()
    : state_(std::make_unique<InternalState>()) {
  EnsureInitialized();
}

TipPrivateContext::~TipPrivateContext() = default;

ClientInterface *TipPrivateContext::GetClient() {
  return state_->client_.get();
}

void TipPrivateContext::EnsureInitialized() {
  if (!state_->input_behavior_.initialized) {
    state_->client_->Reset();

    Capability capability;
    capability.set_text_deletion(Capability::DELETE_PRECEDING_TEXT);
    state_->client_->set_client_capability(capability);
  }

  // Try to reflect the current config to the IME behavior.
  ConfigSnapshot::Info snapshot;
  if (ConfigSnapshot::Get(&snapshot)) {
    auto *behavior = &state_->input_behavior_;
    behavior->prefer_kana_input = snapshot.use_kana_input;
    behavior->use_romaji_key_to_toggle_input_style =
        snapshot.use_keyboard_to_change_preedit_method;
    behavior->use_mode_indicator = snapshot.use_mode_indicator;
    behavior->direct_mode_keys = snapshot.direct_mode_keys;
    behavior->initialized = true;
  }
}

SurrogatePairObserver *TipPrivateContext::GetSurrogatePairObserver() {
  return &state_->surrogate_pair_observer_;
}

TipUiElementManager *TipPrivateContext::GetUiElementManager() {
  return &state_->ui_element_manager_;
}

VKBackBasedDeleter *TipPrivateContext::GetDeleter() {
  return &state_->deleter_;
}

const Output &TipPrivateContext::last_output() const {
  return state_->last_output_;
}

Output *TipPrivateContext::mutable_last_output() {
  return &state_->last_output_;
}

const VirtualKey &TipPrivateContext::last_down_key() const {
  return state_->last_down_key_;
}

VirtualKey *TipPrivateContext::mutable_last_down_key() {
  return &state_->last_down_key_;
}

const InputBehavior &TipPrivateContext::input_behavior() const {
  return state_->input_behavior_;
}

InputBehavior *TipPrivateContext::mutable_input_behavior() {
  return &state_->input_behavior_;
}

}  // namespace tsf
}  // namespace win32
}  // namespace mozc
