/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * 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.
 */
package com.android.car.rotaryplayground;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

/**
 * Fragment for the menu.
 *
 * On focus of a menu item, the associated fragment will start in the R.id.rotary_content container.
 */
public class RotaryMenu extends Fragment {

    private Fragment mRotaryCards = null;
    private Fragment mRotaryGrid = null;
    private Fragment mDirectManipulation = null;
    private Fragment mSysUiDirectManipulation = null;
    private Fragment mNotificationFragment = null;
    private Fragment mScrollFragment = null;

    private Button mCardButton;
    private Button mGridButton;
    private Button mDirectManipulationButton;
    private Button mSysUiDirectManipulationButton;
    private Button mNotificationButton;
    private Button mScrollButton;

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
            @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.rotary_menu, container, false);

        mCardButton = view.findViewById(R.id.cards);
        mCardButton.setOnFocusChangeListener((v, hasFocus) -> showRotaryCards(hasFocus));
        mCardButton.setOnClickListener(v -> showRotaryCards(/* hasFocus= */ true));

        mGridButton = view.findViewById(R.id.grid);
        mGridButton.setOnFocusChangeListener((v, hasFocus) -> showGridExample(hasFocus));
        mGridButton.setOnClickListener(v -> showGridExample(/* hasFocus= */ true));

        mDirectManipulationButton = view.findViewById(R.id.direct_manipulation);
        mDirectManipulationButton.setOnFocusChangeListener(
                (v, hasFocus) -> showDirectManipulationExamples(hasFocus));
        mDirectManipulationButton.setOnClickListener(
                (v -> showDirectManipulationExamples(/* hasFocus= */ true)));

        mSysUiDirectManipulationButton = view.findViewById(R.id.sys_ui_direct_manipulation);
        mSysUiDirectManipulationButton.setOnFocusChangeListener(
                (v, hasFocus) -> showSysUiDirectManipulationExamples(hasFocus));
        mSysUiDirectManipulationButton.setOnClickListener(
                (v -> showSysUiDirectManipulationExamples(/* hasFocus= */ true)));

        mNotificationButton = view.findViewById(R.id.notification);
        mNotificationButton.setOnFocusChangeListener(
                (v, hasFocus) -> showNotificationExample(hasFocus));
        mNotificationButton.setOnClickListener(v -> showNotificationExample(/* hasFocus= */ true));

        mScrollButton = view.findViewById(R.id.scroll);
        mScrollButton.setOnFocusChangeListener((v, hasFocus) -> showScrollFragment(hasFocus));
        mScrollButton.setOnClickListener(v -> showScrollFragment(/* hasFocus= */ true));

        return view;
    }

    private void showRotaryCards(boolean hasFocus) {
        if (!hasFocus) {
            return; // Do nothing if no focus.
        }
        if (mRotaryCards == null) {
            mRotaryCards = new RotaryCards();
        }
        showFragment(mRotaryCards);
    }

    private void showGridExample(boolean hasFocus) {
        if (!hasFocus) {
            return; // do nothing if no focus.
        }
        if (mRotaryGrid == null) {
            mRotaryGrid = new RotaryGrid();
        }
        showFragment(mRotaryGrid);
    }

    // TODO(agathaman): refactor this and the showRotaryCards above into a
    //  showFragment(Fragment fragment, boolean hasFocus); method.
    private void showDirectManipulationExamples(boolean hasFocus) {
        if (!hasFocus) {
            return; // Do nothing if no focus.
        }
        if (mDirectManipulation == null) {
            mDirectManipulation = new RotaryDirectManipulationWidgets();
        }
        showFragment(mDirectManipulation);
    }

    private void showSysUiDirectManipulationExamples(boolean hasFocus) {
        if (!hasFocus) {
            return; // Do nothing if no focus.
        }
        if (mSysUiDirectManipulation == null) {
            mSysUiDirectManipulation = new RotarySysUiDirectManipulationWidgets();
        }
        showFragment(mSysUiDirectManipulation);
    }

    private void showNotificationExample(boolean hasFocus) {
        if (!hasFocus) {
            return; // do nothing if no focus.
        }
        if (mNotificationFragment == null) {
            mNotificationFragment = new HeadsUpNotificationFragment();
        }
        showFragment(mNotificationFragment);
    }

    private void showScrollFragment(boolean hasFocus) {
        if (!hasFocus) {
            return; // Do nothing if no focus.
        }
        if (mScrollFragment == null) {
            mScrollFragment = new ScrollFragment();
        }
        showFragment(mScrollFragment);
    }

    private void showFragment(Fragment fragment) {
        getFragmentManager().beginTransaction()
                .replace(R.id.rotary_content, fragment)
                .commit();
    }
}