/*
 * Copyright (c) CompanyNameMagicTag.
 * 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.
 */

#ifndef APPFWK_VIEW_H
#define APPFWK_VIEW_H

#include "components/ui_view_group.h"
#include "components/root_view.h"
#include "common/screen.h"

namespace OHOS {
template<class P>
class View {
public:
    View() : presenter_(nullptr), rootContainer_(nullptr) {}
    virtual ~View() {}

    /**
     * @brief get container view
     *
     * @returns container
     */
    UIViewGroup* GetRootContainer() const
    {
        return rootContainer_;
    }

    /**
     * @brief Scheduled by slice after funtion SetupView and before transition animator starts if exits.
     *
     *        You should override it to prepare your own views and add them into root container
     *        A simple examle is as follow：
     *        void OnStart() override
     *        {
     *            label_ = new UILabel();
     *            ....
     *            AddViewToRootContainer(label_); // add label_ into container
     *        }
     */
    virtual void OnStart() {}

    /**
     * @brief Scheduled by slice after function TearDownView.
     *
     *        You can override it or override function of Destructor function to destroy ui views
     *        A simple examle is as follow：
     *        void OnStop() override
     *        {
     *            DELETE_IF_NOT_NULL(label_);
     *            ....
     *        }
     */
    virtual void OnStop() {}

    /**
     * @brief Scheduled by slice to create root container add it to root view
     *
     *        This method is called by system class AbilitySlice, you should not override it.
     */
    void SetupView()
    {
        if (rootContainer_ != nullptr) {
            printf("OnStart Error: rootContainer_ already exist");
        } else {
            rootContainer_ = new UIViewGroup();
        }
        rootContainer_->SetPosition(0, 0, RootView::GetInstance()->GetWidth(), RootView::GetInstance()->GetHeight());
        RootView::GetInstance()->Add(rootContainer_);
    }

    /**
     * @brief Scheduled by slice to remove and delete root container from root view
     *
     *        This method is called by by system class AbilitySlice, you should not override it.
     */
    void TearDownView()
    {
        // Todo: Only remove root container, and application should remove other children in its own implemention
        RootView::GetInstance()->Remove(rootContainer_);
        if (rootContainer_ != nullptr) {
            rootContainer_->RemoveAll();
            delete rootContainer_;
            rootContainer_ = nullptr;
        } else {
            printf("TearDownView Error: rootContainer_ was not initialized !!!");
        }
    }

    /**
     * @brief draw container
     *
     */
    void Draw()
    {
        RootView::GetInstance()->Invalidate();
    }

    /**
     * @brief This function will attach presenter to this view
     *
     * @param presenter presenter pointer defined by developer
     */
    void Attach(P* presenter)
    {
        presenter_ = presenter;
    }

    void AddViewToRootContainer(UIView* view)
    {
        if (rootContainer_ == nullptr) {
            printf("AddViewToContainer Error: rootContainer_ is nullptr");
            return;
        }
        rootContainer_->Add(view);
    }

protected:
    P* presenter_;

private:
    UIViewGroup* rootContainer_ = nullptr;
    View(const View&) = delete;
    View& operator=(const View&) = delete;
    View(View&&) = delete;
    View& operator=(View&&) = delete;
};
}
#endif