/*
 * 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.systemui.settings.brightness;

import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;
import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;
import static android.view.WindowManagerPolicyConstants.EXTRA_FROM_BRIGHTNESS_KEY;

import android.app.Activity;
import android.graphics.Rect;
import android.os.Bundle;
import android.view.Gravity;
import android.view.KeyEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.view.accessibility.AccessibilityManager;
import android.widget.FrameLayout;

import com.android.internal.annotations.VisibleForTesting;
import com.android.internal.logging.MetricsLogger;
import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
import com.android.systemui.R;
import com.android.systemui.dagger.qualifiers.Main;
import com.android.systemui.statusbar.policy.AccessibilityManagerWrapper;
import com.android.systemui.util.concurrency.DelayableExecutor;

import java.util.List;

import javax.inject.Inject;

/** A dialog that provides controls for adjusting the screen brightness. */
public class BrightnessDialog extends Activity {

    @VisibleForTesting
    static final int DIALOG_TIMEOUT_MILLIS = 3000;

    private BrightnessController mBrightnessController;
    private final BrightnessSliderController.Factory mToggleSliderFactory;
    private final BrightnessController.Factory mBrightnessControllerFactory;
    private final DelayableExecutor mMainExecutor;
    private final AccessibilityManagerWrapper mAccessibilityMgr;
    private Runnable mCancelTimeoutRunnable;

    @Inject
    public BrightnessDialog(
            BrightnessSliderController.Factory brightnessSliderfactory,
            BrightnessController.Factory brightnessControllerFactory,
            @Main DelayableExecutor mainExecutor,
            AccessibilityManagerWrapper accessibilityMgr
    ) {
        mToggleSliderFactory = brightnessSliderfactory;
        mBrightnessControllerFactory = brightnessControllerFactory;
        mMainExecutor = mainExecutor;
        mAccessibilityMgr = accessibilityMgr;
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        final Window window = getWindow();

        window.setGravity(Gravity.TOP | Gravity.CENTER_HORIZONTAL);
        window.clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND);
        window.requestFeature(Window.FEATURE_NO_TITLE);

        // Calling this creates the decor View, so setLayout takes proper effect
        // (see Dialog#onWindowAttributesChanged)
        window.getDecorView();
        window.setLayout(
                WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.WRAP_CONTENT);
        getTheme().applyStyle(R.style.Theme_SystemUI_QuickSettings, false);

        setContentView(R.layout.brightness_mirror_container);
        FrameLayout frame = findViewById(R.id.brightness_mirror_container);
        // The brightness mirror container is INVISIBLE by default.
        frame.setVisibility(View.VISIBLE);
        ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) frame.getLayoutParams();
        int horizontalMargin =
                getResources().getDimensionPixelSize(R.dimen.notification_side_paddings);
        lp.leftMargin = horizontalMargin;
        lp.rightMargin = horizontalMargin;
        frame.setLayoutParams(lp);
        Rect bounds = new Rect();
        frame.addOnLayoutChangeListener(
                (v, left, top, right, bottom, oldLeft, oldTop, oldRight, oldBottom) -> {
                    // Exclude this view (and its horizontal margins) from triggering gestures.
                    // This prevents back gesture from being triggered by dragging close to the
                    // edge of the slider (0% or 100%).
                    bounds.set(-horizontalMargin, 0, right - left + horizontalMargin, bottom - top);
                    v.setSystemGestureExclusionRects(List.of(bounds));
                });

        BrightnessSliderController controller = mToggleSliderFactory.create(this, frame);
        controller.init();
        frame.addView(controller.getRootView(), MATCH_PARENT, WRAP_CONTENT);

        mBrightnessController = mBrightnessControllerFactory.create(controller);
    }

    @Override
    protected void onStart() {
        super.onStart();
        mBrightnessController.registerCallbacks();
        MetricsLogger.visible(this, MetricsEvent.BRIGHTNESS_DIALOG);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (triggeredByBrightnessKey()) {
            scheduleTimeout();
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out);
    }

    @Override
    protected void onStop() {
        super.onStop();
        MetricsLogger.hidden(this, MetricsEvent.BRIGHTNESS_DIALOG);
        mBrightnessController.unregisterCallbacks();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN
                || keyCode == KeyEvent.KEYCODE_VOLUME_UP
                || keyCode == KeyEvent.KEYCODE_VOLUME_MUTE) {
            if (mCancelTimeoutRunnable != null) {
                mCancelTimeoutRunnable.run();
            }
            finish();
        }

        return super.onKeyDown(keyCode, event);
    }

    private boolean triggeredByBrightnessKey() {
        return getIntent().getBooleanExtra(EXTRA_FROM_BRIGHTNESS_KEY, false);
    }

    private void scheduleTimeout() {
        if (mCancelTimeoutRunnable != null) {
            mCancelTimeoutRunnable.run();
        }
        final int timeout = mAccessibilityMgr.getRecommendedTimeoutMillis(DIALOG_TIMEOUT_MILLIS,
                AccessibilityManager.FLAG_CONTENT_CONTROLS);
        mCancelTimeoutRunnable = mMainExecutor.executeDelayed(this::finish, timeout);
    }
}