/*
 * Copyright (C) 2018 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.homepage;

import static android.provider.Settings.ACTION_SETTINGS_EMBED_DEEP_LINK_ACTIVITY;
import static android.provider.Settings.EXTRA_SETTINGS_EMBEDDED_DEEP_LINK_HIGHLIGHT_MENU_KEY;
import static android.provider.Settings.EXTRA_SETTINGS_EMBEDDED_DEEP_LINK_INTENT_URI;

import android.animation.LayoutTransition;
import android.app.ActivityManager;
import android.app.settings.SettingsEnums;
import android.content.ComponentName;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.FeatureFlagUtils;
import android.util.Log;
import android.view.View;
import android.widget.FrameLayout;
import android.widget.ImageView;
import android.widget.Toolbar;

import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import com.android.settings.R;
import com.android.settings.Settings;
import com.android.settings.SettingsActivity;
import com.android.settings.Utils;
import com.android.settings.accounts.AvatarViewMixin;
import com.android.settings.activityembedding.ActivityEmbeddingRulesController;
import com.android.settings.activityembedding.ActivityEmbeddingUtils;
import com.android.settings.core.CategoryMixin;
import com.android.settings.core.FeatureFlags;
import com.android.settings.homepage.contextualcards.ContextualCardsFragment;
import com.android.settings.overlay.FeatureFactory;
import com.android.settingslib.core.lifecycle.HideNonSystemOverlayMixin;

import java.net.URISyntaxException;

/** Settings homepage activity */
public class SettingsHomepageActivity extends FragmentActivity implements
        CategoryMixin.CategoryHandler {

    private static final String TAG = "SettingsHomepageActivity";

    // Put true value to the intent when startActivity for a deep link intent from this Activity.
    public static final String EXTRA_IS_FROM_SETTINGS_HOMEPAGE = "is_from_settings_homepage";

    // An alias class name of SettingsHomepageActivity.
    public static final String ALIAS_DEEP_LINK = "com.android.settings.DeepLinkHomepageActivity";

    private static final int DEFAULT_HIGHLIGHT_MENU_KEY = R.string.menu_key_network;
    private static final long HOMEPAGE_LOADING_TIMEOUT_MS = 300;

    private View mHomepageView;
    private View mSuggestionView;
    private CategoryMixin mCategoryMixin;

    @Override
    public CategoryMixin getCategoryMixin() {
        return mCategoryMixin;
    }

    /**
     * Shows the homepage and shows/hides the suggestion together. Only allows to be executed once
     * to avoid the flicker caused by the suggestion suddenly appearing/disappearing.
     */
    public void showHomepageWithSuggestion(boolean showSuggestion) {
        if (mHomepageView == null) {
            return;
        }
        Log.i(TAG, "showHomepageWithSuggestion: " + showSuggestion);
        mSuggestionView.setVisibility(showSuggestion ? View.VISIBLE : View.GONE);
        mHomepageView.setVisibility(View.VISIBLE);
        mHomepageView = null;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings_homepage_container);

        final View appBar = findViewById(R.id.app_bar_container);
        appBar.setMinimumHeight(getSearchBoxHeight());
        initHomepageContainer();

        final Toolbar toolbar = findViewById(R.id.search_action_bar);
        FeatureFactory.getFactory(this).getSearchFeatureProvider()
                .initSearchToolbar(this /* activity */, toolbar, SettingsEnums.SETTINGS_HOMEPAGE);

        getLifecycle().addObserver(new HideNonSystemOverlayMixin(this));
        mCategoryMixin = new CategoryMixin(this);
        getLifecycle().addObserver(mCategoryMixin);

        if (!getSystemService(ActivityManager.class).isLowRamDevice()) {
            // Only allow features on high ram devices.
            final ImageView avatarView = findViewById(R.id.account_avatar);
            if (AvatarViewMixin.isAvatarSupported(this)) {
                avatarView.setVisibility(View.VISIBLE);
                getLifecycle().addObserver(new AvatarViewMixin(this, avatarView));
            }

            showSuggestionFragment();

            if (FeatureFlagUtils.isEnabled(this, FeatureFlags.CONTEXTUAL_HOME)) {
                showFragment(new ContextualCardsFragment(), R.id.contextual_cards_content);
            }
        }
        final Fragment fragment = new TopLevelSettings();
        fragment.getArguments().putString(SettingsActivity.EXTRA_FRAGMENT_ARG_KEY,
                getHighlightMenuKey());
        showFragment(fragment, R.id.main_content);

        ((FrameLayout) findViewById(R.id.main_content))
                .getLayoutTransition().enableTransitionType(LayoutTransition.CHANGING);

        // Launch the intent from deep link for large screen devices.
        launchDeepLinkIntentToRight();
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);

        // When it's large screen 2-pane and Settings app is in the background, receiving an Intent
        // will not recreate this activity. Update the intent for this case.
        setIntent(intent);
        reloadHighlightMenuKey();
        if (isFinishing()) {
            return;
        }
        // Launch the intent from deep link for large screen devices.
        launchDeepLinkIntentToRight();
    }

    private void showSuggestionFragment() {
        final Class<? extends Fragment> fragment = FeatureFactory.getFactory(this)
                .getSuggestionFeatureProvider(this).getContextualSuggestionFragment();
        if (fragment == null) {
            return;
        }

        mSuggestionView = findViewById(R.id.suggestion_content);
        mHomepageView = findViewById(R.id.settings_homepage_container);
        // Hide the homepage for preparing the suggestion.
        mHomepageView.setVisibility(View.GONE);
        // Schedule a timer to show the homepage and hide the suggestion on timeout.
        mHomepageView.postDelayed(() -> showHomepageWithSuggestion(false),
                HOMEPAGE_LOADING_TIMEOUT_MS);
        try {
            showFragment(fragment.getConstructor().newInstance(), R.id.suggestion_content);
        } catch (Exception e) {
            Log.w(TAG, "Cannot show fragment", e);
        }
    }

    private void showFragment(Fragment fragment, int id) {
        final FragmentManager fragmentManager = getSupportFragmentManager();
        final FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        final Fragment showFragment = fragmentManager.findFragmentById(id);

        if (showFragment == null) {
            fragmentTransaction.add(id, fragment);
        } else {
            fragmentTransaction.show(showFragment);
        }
        fragmentTransaction.commit();
    }

    private void launchDeepLinkIntentToRight() {
        if (!ActivityEmbeddingUtils.isEmbeddingActivityEnabled(this)) {
            return;
        }

        final Intent intent = getIntent();
        if (intent == null || !TextUtils.equals(intent.getAction(),
                ACTION_SETTINGS_EMBED_DEEP_LINK_ACTIVITY)) {
            return;
        }

        final String intentUriString = intent.getStringExtra(
                EXTRA_SETTINGS_EMBEDDED_DEEP_LINK_INTENT_URI);
        if (TextUtils.isEmpty(intentUriString)) {
            Log.e(TAG, "No EXTRA_SETTINGS_EMBEDDED_DEEP_LINK_INTENT_URI to deep link");
            finish();
            return;
        }

        final Intent targetIntent;
        try {
            targetIntent = Intent.parseUri(intentUriString, Intent.URI_INTENT_SCHEME);
        } catch (URISyntaxException e) {
            Log.e(TAG, "Failed to parse deep link intent: " + e);
            finish();
            return;
        }

        final ComponentName targetComponentName = targetIntent.resolveActivity(getPackageManager());
        if (targetComponentName == null) {
            Log.e(TAG, "No valid target for the deep link intent: " + targetIntent);
            finish();
            return;
        }
        targetIntent.setComponent(targetComponentName);

        // To prevent launchDeepLinkIntentToRight again for configuration change.
        intent.setAction(null);

        targetIntent.setFlags(targetIntent.getFlags() & ~Intent.FLAG_ACTIVITY_NEW_TASK);
        targetIntent.addFlags(Intent.FLAG_ACTIVITY_FORWARD_RESULT);

        // Sender of intent may want to send intent extra data to the destination of targetIntent.
        targetIntent.replaceExtras(intent);

        targetIntent.putExtra(EXTRA_IS_FROM_SETTINGS_HOMEPAGE, true);

        // Set 2-pane pair rule for the deep link page.
        ActivityEmbeddingRulesController.registerTwoPanePairRule(this,
                new ComponentName(Utils.SETTINGS_PACKAGE_NAME, ALIAS_DEEP_LINK),
                targetComponentName,
                targetIntent.getAction(),
                true /* finishPrimaryWithSecondary */,
                true /* finishSecondaryWithPrimary */);
        ActivityEmbeddingRulesController.registerTwoPanePairRule(this,
                new ComponentName(Settings.class.getPackageName(), Settings.class.getName()),
                targetComponentName,
                targetIntent.getAction(),
                true /* finishPrimaryWithSecondary */,
                true /* finishSecondaryWithPrimary */);
        startActivity(targetIntent);
    }

    private String getHighlightMenuKey() {
        final Intent intent = getIntent();
        if (intent != null && TextUtils.equals(intent.getAction(),
                ACTION_SETTINGS_EMBED_DEEP_LINK_ACTIVITY)) {
            final String menuKey = intent.getStringExtra(
                    EXTRA_SETTINGS_EMBEDDED_DEEP_LINK_HIGHLIGHT_MENU_KEY);
            if (!TextUtils.isEmpty(menuKey)) {
                return menuKey;
            }
        }
        return getString(DEFAULT_HIGHLIGHT_MENU_KEY);
    }

    private void reloadHighlightMenuKey() {
        final TopLevelSettings fragment =
                (TopLevelSettings) getSupportFragmentManager().findFragmentById(R.id.main_content);
        if (fragment != null) {
            fragment.getArguments().putString(SettingsActivity.EXTRA_FRAGMENT_ARG_KEY,
                    getHighlightMenuKey());
            fragment.reloadHighlightMenuKey();
        }
    }

    private void initHomepageContainer() {
        final View view = findViewById(R.id.homepage_container);
        // Prevent inner RecyclerView gets focus and invokes scrolling.
        view.setFocusableInTouchMode(true);
        view.requestFocus();
    }

    private int getSearchBoxHeight() {
        final int searchBarHeight = getResources().getDimensionPixelSize(R.dimen.search_bar_height);
        final int searchBarMargin = getResources().getDimensionPixelSize(R.dimen.search_bar_margin);
        return searchBarHeight + searchBarMargin * 2;
    }
}