/*
 * Copyright (C) 2019 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.settings.dashboard.profileselector;

import static android.content.Intent.EXTRA_USER_ID;

import android.annotation.IntDef;
import android.app.Activity;
import android.content.Context;
import android.content.res.ColorStateList;
import android.os.Bundle;
import android.os.UserHandle;
import android.os.UserManager;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.LinearLayout;

import androidx.annotation.VisibleForTesting;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentStatePagerAdapter;
import androidx.recyclerview.widget.RecyclerView;
import androidx.viewpager.widget.ViewPager;

import com.android.settings.R;
import com.android.settings.SettingsActivity;
import com.android.settings.Utils;
import com.android.settings.dashboard.DashboardFragment;

import com.google.android.material.tabs.TabLayout;

import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.util.Locale;

/**
 * Base fragment class for profile settings.
 */
public abstract class ProfileSelectFragment extends DashboardFragment {

    private static final String TAG = "ProfileSelectFragment";

    /**
     * Denotes the profile type.
     */
    @Retention(RetentionPolicy.SOURCE)
    @IntDef({
            ProfileType.PERSONAL,
            ProfileType.WORK,
            ProfileType.ALL
    })
    public @interface ProfileType {
        /**
         * It is personal work profile.
         */
        int PERSONAL = 1;

        /**
         * It is work profile
         */
        int WORK = 1 << 1;

        /**
         * It is personal and work profile
         */
        int ALL = PERSONAL | WORK;
    }

    /**
     * Used in fragment argument and pass {@link ProfileType} to it
     */
    public static final String EXTRA_PROFILE = "profile";

    /**
     * Used in fragment argument with Extra key {@link SettingsActivity.EXTRA_SHOW_FRAGMENT_TAB}
     */
    public static final int PERSONAL_TAB = 0;

    /**
     * Used in fragment argument with Extra key {@link SettingsActivity.EXTRA_SHOW_FRAGMENT_TAB}
     */
    public static final int WORK_TAB = 1;
    private static final int[] LABEL = {
            R.string.category_personal, R.string.category_work
    };

    private ViewGroup mContentView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        mContentView = (ViewGroup) super.onCreateView(inflater, container, savedInstanceState);
        final Activity activity = getActivity();
        final int selectedTab = convertPosition(getTabId(activity, getArguments()));

        final View tabContainer = mContentView.findViewById(R.id.tab_container);
        final ViewPager viewPager = tabContainer.findViewById(R.id.view_pager);
        viewPager.setAdapter(new ProfileSelectFragment.ViewPagerAdapter(this));
        final TabLayout tabs = tabContainer.findViewById(R.id.tabs);
        tabs.setupWithViewPager(viewPager);
        setupTabTextColor(tabs);
        tabContainer.setVisibility(View.VISIBLE);
        final TabLayout.Tab tab = tabs.getTabAt(selectedTab);
        tab.select();

        final FrameLayout listContainer = mContentView.findViewById(android.R.id.list_container);
        listContainer.setLayoutParams(new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT));

        final RecyclerView recyclerView = getListView();
        recyclerView.setOverScrollMode(View.OVER_SCROLL_NEVER);
        Utils.setActionBarShadowAnimation(activity, getSettingsLifecycle(), recyclerView);

        return mContentView;
    }

    /**
     * TabLayout uses ColorStateList of 2 states, selected state and empty state.
     * It's expected to use textColorSecondary default state color as empty state tabTextColor.
     *
     * However, TabLayout uses textColorSecondary by a not expected state.
     * This method sets tabTextColor with the color of expected textColorSecondary state.
     */
    private void setupTabTextColor(TabLayout tabLayout) {
        final ColorStateList defaultColorStateList = tabLayout.getTabTextColors();
        final ColorStateList resultColorStateList = new ColorStateList(
                new int[][]{
                    new int[]{android.R.attr.state_selected},
                    new int[]{}
                },
                new int[] {
                    defaultColorStateList.getColorForState(new int[]{android.R.attr.state_selected},
                            Utils.getColorAttrDefaultColor(getContext(),
                            com.android.internal.R.attr.colorAccentPrimaryVariant)),
                    Utils.getColorAttrDefaultColor(getContext(), android.R.attr.textColorSecondary)
                }
        );
        tabLayout.setTabTextColors(resultColorStateList);
    }

    @Override
    public int getMetricsCategory() {
        return METRICS_CATEGORY_UNKNOWN;
    }

    /**
     * Returns an array of {@link Fragment} to display in the
     * {@link com.google.android.material.tabs.TabLayout}
     */
    public abstract Fragment[] getFragments();

    @Override
    protected int getPreferenceScreenResId() {
        return R.xml.placeholder_preference_screen;
    }

    @Override
    protected String getLogTag() {
        return TAG;
    }

    @VisibleForTesting
    int getTabId(Activity activity, Bundle bundle) {
        if (bundle != null) {
            final int extraTab = bundle.getInt(SettingsActivity.EXTRA_SHOW_FRAGMENT_TAB, -1);
            if (extraTab != -1) {
                return extraTab;
            }
            final int userId = bundle.getInt(EXTRA_USER_ID, UserHandle.SYSTEM.getIdentifier());
            final boolean isWorkProfile = UserManager.get(activity).isManagedProfile(userId);
            if (isWorkProfile) {
                return WORK_TAB;
            }
        }
        // Start intent from a specific user eg: adb shell --user 10
        final int intentUser = activity.getIntent().getContentUserHint();
        if (UserManager.get(activity).isManagedProfile(intentUser)) {
            return WORK_TAB;
        }

        return PERSONAL_TAB;
    }

    static class ViewPagerAdapter extends FragmentStatePagerAdapter {

        private final Fragment[] mChildFragments;
        private final Context mContext;

        ViewPagerAdapter(ProfileSelectFragment fragment) {
            super(fragment.getChildFragmentManager());
            mContext = fragment.getContext();
            mChildFragments = fragment.getFragments();
        }

        @Override
        public Fragment getItem(int position) {
            return mChildFragments[convertPosition(position)];
        }

        @Override
        public int getCount() {
            return mChildFragments.length;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return mContext.getString(LABEL[convertPosition(position)]);
        }
    }

    private static int convertPosition(int index) {
        if (TextUtils.getLayoutDirectionFromLocale(Locale.getDefault())
                == View.LAYOUT_DIRECTION_RTL) {
            return LABEL.length - 1 - index;
        }
        return index;
    }
}