/*
 * Copyright (c) 2011 - 2021 Samsung Electronics Co., Ltd All Rights Reserved
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <app_common_internal.h>
#include <app_control_internal.h>
#include <dlog.h>
#include <tizen_error.h>

#include <app_core_efl_base.hh>
#include <app_event_internal.hh>

#include <list>
#include <memory>
#include <stdexcept>
#include <utility>

#include "app_internal.h"
#include "common_private.hh"
#include "log_private.hh"

namespace {

using namespace tizen_cpp;

class UiAppContext : public AppCoreEflBase {
 public:
  enum AppState {
    APP_STATE_NOT_RUNNING,
    APP_STATE_CREATING,
    APP_STATE_RUNNING,
  };

  UiAppContext(ui_app_lifecycle_callback_s callback, void* data,
      unsigned int hint)
      : AppCoreEflBase(hint), callback_(callback), data_(data) {
    SetAppState(APP_STATE_CREATING);
  }

  void Run(int argc, char** argv) override {
    SetAppState(APP_STATE_RUNNING);
    AppCoreEflBase::Run(argc, argv);
    SetAppState(APP_STATE_NOT_RUNNING);
  }

  int OnCreate() override {
    LOGW("ui_app_create()");
    AppCoreEflBase::OnCreate();
    if (callback_.create == nullptr || callback_.create(data_) == false) {
      return app_error(APP_ERROR_INVALID_CONTEXT, __FUNCTION__,
          "app_create_cb() returns false");
    }

    return APP_ERROR_NONE;
  }

  int OnControl(tizen_base::Bundle b) override {
    app_control_h app_control = nullptr;

    LOGW("ui_app_control()");
    AppCoreEflBase::OnControl(b);

    if (b.GetHandle()) {
      int ret = app_control_create_event(b.GetHandle(), &app_control);
      if (ret != APP_ERROR_NONE) {
        // LCOV_EXCL_START
        _E("Failed to create an app_control handle");
        return APP_ERROR_INVALID_PARAMETER;
        // LCOV_EXCL_STOp
      }
    } else {
      // LCOV_EXCL_START
      if (app_control_create(&app_control) != APP_ERROR_NONE) {
        _E("Failed to create an app_control handle");
        return APP_ERROR_OUT_OF_MEMORY;
      }
      // LCOV_EXCL_STOP
    }

    if (callback_.app_control)
      callback_.app_control(app_control, data_);

    app_control_destroy(app_control);
    return APP_ERROR_NONE;
  }

  int OnTerminate() override {
    LOGW("ui_app_terminate()");
    AppCoreEflBase::OnTerminate();

    if (callback_.terminate)
      callback_.terminate(data_);

    return APP_ERROR_NONE;
  }

  int OnPause() override {
    LOGW("ui_app_pause()");
    AppCoreEflBase::OnPause();
    if (callback_.pause)
      callback_.pause(data_);
    return APP_ERROR_NONE;
  }

  int OnResume() override {
    LOGW("ui_app_resume");
    AppCoreEflBase::OnResume();
    if (callback_.resume)
      callback_.resume(data_);
    return APP_ERROR_NONE;
  }

  AppState GetAppState() const {
    return state_;
  }

  void SetAppState(AppState state) {
    state_ = state;
  }

 private:
  ui_app_lifecycle_callback_s callback_;
  void* data_;
  AppState state_ = APP_STATE_NOT_RUNNING;
};

constexpr int UI_APP_EVENT_MAX = 8;
constexpr IAppCore::IEvent::Type __app_event_converter[UI_APP_EVENT_MAX] = {
  [APP_EVENT_LOW_MEMORY] =
      IAppCore::IEvent::Type::LOW_MEMORY,
  [APP_EVENT_LOW_BATTERY] =
      IAppCore::IEvent::Type::LOW_BATTERY,
  [APP_EVENT_LANGUAGE_CHANGED] =
      IAppCore::IEvent::Type::LANG_CHANGE,
  [APP_EVENT_DEVICE_ORIENTATION_CHANGED] =
      IAppCore::IEvent::Type::DEVICE_ORIENTATION_CHANGED,
  [APP_EVENT_REGION_FORMAT_CHANGED] =
      IAppCore::IEvent::Type::REGION_CHANGE,
  [APP_EVENT_SUSPENDED_STATE_CHANGED] =
      IAppCore::IEvent::Type::SUSPENDED_STATE_CHANGE,
  [APP_EVENT_UPDATE_REQUESTED] =
      IAppCore::IEvent::Type::UPDATE_REQUESTED,
  [APP_EVENT_TIME_ZONE_CHANGED] =
      IAppCore::IEvent::Type::TIME_ZONE_CHANGED,
};

std::unique_ptr<UiAppContext> __context;
std::list<std::shared_ptr<AppEvent>> __pending_app_events;

}  // namespace

API int ui_app_main(int argc, char** argv,
    ui_app_lifecycle_callback_s* callback, void* user_data) {
  if (argc < 1 || argv == nullptr || callback == nullptr) {
    _E("Invalid parameter");
    return APP_ERROR_INVALID_PARAMETER;
  }

  if (callback->create == nullptr) {
    // LCOV_EXCL_START
    _E("app_create_cb() callback MUST be registerted");
    return APP_ERROR_INVALID_PARAMETER;
    // LCOV_EXCL_STOP
  }

  // LCOV_EXCL_START
  if (__context.get() != nullptr &&
      __context->GetAppState() != UiAppContext::APP_STATE_NOT_RUNNING) {
    _E("Already running");
    return APP_ERROR_ALREADY_RUNNING;
  }
  // LCOV_EXCL_STOP

  unsigned int hint = AppCoreEflBase::HINT_WINDOW_GROUP_CONTROL |
      AppCoreEflBase::HINT_WINDOW_STACK_CONTROL |
      AppCoreEflBase::HINT_BG_LAUNCH_CONTROL |
      AppCoreEflBase::HINT_HW_ACC_CONTROL |
      AppCoreEflBase::HINT_WINDOW_AUTO_CONTROL |
      AppCoreEflBase::HINT_LEGACY_CONTROL |
      AppCoreEflBase::HINT_WINDOW_ID_CONTROL;

  LOGW("ui_app_main()");
  try {
    __context = std::make_unique<UiAppContext>(*callback, user_data, hint);
    for (auto i : __pending_app_events)
      __context->AddEvent(std::move(i));

    __context->Run(argc, argv);
  } catch (std::runtime_error& e) {
    __context->SetAppState(UiAppContext::APP_STATE_NOT_RUNNING);  // LCOV_EXCL_LINE
  }

  return APP_ERROR_NONE;
}

API void ui_app_exit(void) {
  LOGW("ui_app_exit()");
  if (__context.get() &&
      __context->GetAppState() == UiAppContext::APP_STATE_RUNNING)
    __context->Exit();
}

API int ui_app_add_event_handler(app_event_handler_h* event_handler,
    app_event_type_e event_type, app_event_cb callback, void* user_data) {
  if (event_handler == nullptr || callback == nullptr) {
    _E("Invalid parameter");
    return APP_ERROR_INVALID_PARAMETER;
  }

  if (event_type < APP_EVENT_LOW_MEMORY ||
      event_type > APP_EVENT_TIME_ZONE_CHANGED) {
    _E("Invalid event type");
    return APP_ERROR_INVALID_PARAMETER;
  }

  auto* ae = new (std::nothrow) AppEvent(__app_event_converter[event_type],
      callback, user_data);
  if (ae == nullptr) {
    // LCOV_EXCL_START
    _E("Out of memory");
    return APP_ERROR_OUT_OF_MEMORY;
    // LCOV_EXCL_STOP
  }

  auto* h = new (std::nothrow) std::shared_ptr<AppEvent>(ae);
  if (h == nullptr) {
    // LCOV_EXCL_START
    _E("Out of memory");
    delete ae;
    return APP_ERROR_OUT_OF_MEMORY;
    // LCOV_EXCL_STOP
  }

  if (__context.get() &&
      __context->GetAppState() == UiAppContext::APP_STATE_RUNNING) {
    __context->AddEvent(*h);
  } else {
    __pending_app_events.push_back(*h);
  }

  *event_handler = reinterpret_cast<app_event_handler_h>(h);
  return APP_ERROR_NONE;
}

API int ui_app_remove_event_handler(app_event_handler_h event_handler) {
  if (event_handler == nullptr) {
    _E("Invalid parameter");
    return APP_ERROR_INVALID_PARAMETER;
  }

  auto* eb = reinterpret_cast<std::shared_ptr<AppEvent>*>(event_handler);
  auto type = (*eb)->GetType();
  if (type < IAppCore::IEvent::Type::LOW_MEMORY ||
      type > IAppCore::IEvent::Type::TIME_ZONE_CHANGED) {
    // LCOV_EXCL_START
    _E("invalid parameter");
    return APP_ERROR_INVALID_PARAMETER;
    // LCOV_EXCL_STOP
  }

  if (__context.get() &&
      __context->GetAppState() == UiAppContext::APP_STATE_RUNNING) {
    if (!__context->RemoveEvent(*eb)) {
      // LCOV_EXCL_START
      _E("Invalid handle");
      return APP_ERROR_INVALID_PARAMETER;
      // LCOV_EXCL_STOP
    }
  } else {
    __pending_app_events.remove(*eb);
  }

  delete eb;
  return APP_ERROR_NONE;
}

API int ui_app_get_window_position(int *x, int *y, int *w, int *h) {
  if (x == nullptr || y == nullptr || w == nullptr || h == nullptr)
    return APP_ERROR_INVALID_PARAMETER;

  if (__context.get() == nullptr ||
      __context->GetWindowPosition(x, y, w, h) < 0)
    return APP_ERROR_NOT_SUPPORTED;

  return APP_ERROR_NONE;
}