/*
 * Copyright 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 androidx.wear.widget;

import static java.lang.Math.max;

import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.Animatable;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Looper;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewGroup.MarginLayoutParams;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityManager;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.IntDef;
import androidx.annotation.MainThread;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RestrictTo;
import androidx.annotation.VisibleForTesting;
import androidx.core.content.ContextCompat;
import androidx.wear.R;
import androidx.wear.activity.ConfirmationActivity;

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

/**
 * Displays a full-screen confirmation animation with optional text and then hides it.
 *
 * <p>This is a lighter-weight version of {@link ConfirmationActivity}
 * and should be preferred when constructed from an {@link Activity}.
 *
 * <p>Sample usage:
 *
 * <pre>
 *   // Defaults to SUCCESS_ANIMATION
 *   new ConfirmationOverlay().showOn(myActivity);
 *
 *   new ConfirmationOverlay()
 *      .setType(ConfirmationOverlay.OPEN_ON_PHONE_ANIMATION)
 *      .setDuration(3000)
 *      .setMessage("Opening...")
 *      .setOnAnimationFinishedListener(new ConfirmationOverlay.OnAnimationFinishedListener() {
 *          {@literal @}Override
 *          public void onAnimationFinished() {
 *              // Finished animating and the content view has been removed from myActivity.
 *          }
 *      }).showOn(myActivity);
 *
 *   // Default duration is {@link #DEFAULT_ANIMATION_DURATION_MS}
 *   new ConfirmationOverlay()
 *      .setType(ConfirmationOverlay.FAILURE_ANIMATION)
 *      .setMessage("Failed")
 *      .setOnAnimationFinishedListener(new ConfirmationOverlay.OnAnimationFinishedListener() {
 *          {@literal @}Override
 *          public void onAnimationFinished() {
 *              // Finished animating and the view has been removed from myView.getRootView().
 *          }
 *      }).showAbove(myView);
 * </pre>
 */
public class ConfirmationOverlay {

    /**
     * Interface for listeners to be notified when the {@link ConfirmationOverlay} animation has
     * finished and its {@link View} has been removed.
     */
    public interface OnAnimationFinishedListener {
        /**
         * Called when the confirmation animation is finished.
         */
        void onAnimationFinished();
    }

    /** Default animation duration in ms. **/
    public static final int DEFAULT_ANIMATION_DURATION_MS = 1000;

    /** Default animation duration in ms. **/
    private static final int A11Y_ANIMATION_DURATION_MS = 5000;

    /** Types of animations to display in the overlay. */
    @Retention(RetentionPolicy.SOURCE)
    @IntDef({SUCCESS_ANIMATION, FAILURE_ANIMATION, OPEN_ON_PHONE_ANIMATION})
    public @interface OverlayType {
    }

    /** {@link OverlayType} indicating the success animation overlay should be displayed. */
    public static final int SUCCESS_ANIMATION = 0;

    /**
     * {@link OverlayType} indicating the failure overlay should be shown. The icon associated with
     * this type, unlike the others, does not animate.
     */
    public static final int FAILURE_ANIMATION = 1;

    /** {@link OverlayType} indicating the "Open on Phone" animation overlay should be displayed. */
    public static final int OPEN_ON_PHONE_ANIMATION = 2;

    @OverlayType
    private int mType = SUCCESS_ANIMATION;
    private int mDurationMillis = DEFAULT_ANIMATION_DURATION_MS;
    @SuppressWarnings("WeakerAccess") /* synthetic access */
            OnAnimationFinishedListener mListener;
    private CharSequence mMessage = "";
    @SuppressWarnings("WeakerAccess") /* synthetic access */
            View mOverlayView;
    private Drawable mOverlayDrawable;
    @SuppressWarnings("WeakerAccess") /* synthetic access */
            boolean mIsShowing = false;

    private final Handler mMainThreadHandler = new Handler(Looper.getMainLooper());
    private final Runnable mHideRunnable =
            new Runnable() {
                @Override
                public void run() {
                    hide();
                }
            };

    /**
     * Sets a message which will be displayed at the same time as the animation.
     *
     * @return {@code this} object for method chaining.
     * @deprecated Use {@link #setMessage(CharSequence)} instead.
     */
    @NonNull
    @Deprecated
    public ConfirmationOverlay setMessage(@NonNull String message) {
        mMessage = message;
        return this;
    }

    /**
     * Sets a message which will be displayed at the same time as the animation.
     *
     * @return {@code this} object for method chaining.
     */
    @NonNull
    public ConfirmationOverlay setMessage(@NonNull CharSequence message) {
        mMessage = message;
        return this;
    }

    /**
     * Sets the {@link OverlayType} which controls which animation is displayed.
     *
     * @return {@code this} object for method chaining.
     */
    @NonNull
    public ConfirmationOverlay setType(@OverlayType int type) {
        mType = type;
        return this;
    }

    /**
     * Sets the duration in milliseconds which controls how long the animation will be displayed.
     * Default duration is {@link #DEFAULT_ANIMATION_DURATION_MS}.
     *
     * @return {@code this} object for method chaining.
     */
    @NonNull
    public ConfirmationOverlay setDuration(int millis) {
        mDurationMillis = millis;
        return this;
    }

    /**
     * Sets the {@link OnAnimationFinishedListener} which will be invoked once the overlay is no
     * longer visible.
     *
     * @return {@code this} object for method chaining.
     * @deprecated Use
     * {@link #setOnAnimationFinishedListener(OnAnimationFinishedListener)} instead.
     */
    @NonNull
    @Deprecated
    public ConfirmationOverlay setFinishedAnimationListener(
            @Nullable OnAnimationFinishedListener listener) {
        mListener = listener;
        return this;
    }

    /**
     * Sets the {@link OnAnimationFinishedListener} which will be invoked once the overlay is no
     * longer visible.
     *
     * @return {@code this} object for method chaining.
     */
    @NonNull
    public ConfirmationOverlay setOnAnimationFinishedListener(
            @Nullable OnAnimationFinishedListener listener) {
        mListener = listener;
        return this;
    }

    /**
     * Adds the overlay as a child of {@code view.getRootView()}, removing it when complete. While
     * it is shown, all touches will be intercepted to prevent accidental taps on obscured views.
     */
    @MainThread
    public void showAbove(@NonNull View view) {
        if (mIsShowing) {
            return;
        }
        mIsShowing = true;

        updateOverlayView(view.getContext());
        ((ViewGroup) view.getRootView()).addView(mOverlayView);
        setUpForAccessibility();
        animateAndHideAfterDelay();
    }

    /**
     * Adds the overlay as a content view to the {@code activity}, removing it when complete. While
     * it is shown, all touches will be intercepted to prevent accidental taps on obscured views.
     */
    @MainThread
    public void showOn(@NonNull Activity activity) {
        if (mIsShowing) {
            return;
        }
        mIsShowing = true;

        updateOverlayView(activity);
        activity.getWindow().addContentView(mOverlayView, mOverlayView.getLayoutParams());
        setUpForAccessibility();
        animateAndHideAfterDelay();
    }

    private void setUpForAccessibility() {
        mOverlayView.setContentDescription(getAccessibilityText());
        mOverlayView.requestFocus();
        mOverlayView.sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED);
    }

    /**
     * Returns {@link #A11Y_ANIMATION_DURATION_MS} or {@link #mDurationMillis}, which ever is higher
     * if accessibility is turned on or {@link #mDurationMillis} otherwise.
     */
    private int getDurationMillis() {
        if (mOverlayView.getContext().getSystemService(AccessibilityManager.class).isEnabled()) {
            return max(A11Y_ANIMATION_DURATION_MS, mDurationMillis);
        }
        return mDurationMillis;
    }

    @MainThread
    private void animateAndHideAfterDelay() {
        if (mOverlayDrawable instanceof Animatable) {
            Animatable animatable = (Animatable) mOverlayDrawable;
            animatable.start();
        }
        mMainThreadHandler.postDelayed(mHideRunnable, getDurationMillis());
    }

    /**
     * Starts a fadeout animation and removes the view once finished. This is invoked by {@link
     * #mHideRunnable} after {@link #mDurationMillis} milliseconds.
     *
     * @hide
     */
    @MainThread
    @VisibleForTesting
    @RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
    public void hide() {
        Animation fadeOut =
                AnimationUtils.loadAnimation(mOverlayView.getContext(), android.R.anim.fade_out);
        fadeOut.setAnimationListener(
                new AnimationListener() {
                    @Override
                    public void onAnimationStart(Animation animation) {
                        mOverlayView.clearAnimation();
                    }

                    @Override
                    public void onAnimationEnd(Animation animation) {
                        ((ViewGroup) mOverlayView.getParent()).removeView(mOverlayView);
                        mIsShowing = false;
                        if (mListener != null) {
                            mListener.onAnimationFinished();
                        }
                        mOverlayView.clearFocus();
                    }

                    @Override
                    public void onAnimationRepeat(Animation animation) {
                    }
                });
        mOverlayView.startAnimation(fadeOut);
    }

    @MainThread
    private void updateOverlayView(Context context) {
        if (mOverlayView == null) {
            //noinspection InflateParams
            mOverlayView =
                    LayoutInflater.from(context).inflate(R.layout.ws_overlay_confirmation, null);
        }
        mOverlayView.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                return true;
            }
        });
        mOverlayView.setLayoutParams(
                new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));

        updateImageView(context, mOverlayView);
        updateMessageView(context, mOverlayView);
    }

    @MainThread
    private void updateMessageView(Context context, View overlayView) {
        TextView messageView =
                overlayView.findViewById(R.id.wearable_support_confirmation_overlay_message);

        int screenWidthPx = ResourcesUtil.getScreenWidthPx(context);
        int insetMarginPx = ResourcesUtil.getFractionOfScreenPx(
                context, screenWidthPx, R.fraction.confirmation_overlay_text_inset_margin);

        MarginLayoutParams layoutParams = (MarginLayoutParams) messageView.getLayoutParams();
        layoutParams.leftMargin = insetMarginPx;
        layoutParams.rightMargin = insetMarginPx;

        messageView.setLayoutParams(layoutParams);
        messageView.setText(mMessage);
        messageView.setVisibility(View.VISIBLE);
    }

    @MainThread
    private void updateImageView(Context context, View overlayView) {
        switch (mType) {
            case SUCCESS_ANIMATION:
                mOverlayDrawable = ContextCompat.getDrawable(context,
                        R.drawable.confirmation_animation);
                break;
            case FAILURE_ANIMATION:
                mOverlayDrawable = ContextCompat.getDrawable(context, R.drawable.failure_animation);
                break;
            case OPEN_ON_PHONE_ANIMATION:
                mOverlayDrawable =
                        ContextCompat.getDrawable(context, R.drawable.open_on_phone_animation);
                break;
            default:
                String errorMessage =
                        String.format(Locale.US, "Invalid ConfirmationOverlay type [%d]", mType);
                throw new IllegalStateException(errorMessage);
        }

        ImageView imageView =
                overlayView.findViewById(R.id.wearable_support_confirmation_overlay_image);
        imageView.setImageDrawable(mOverlayDrawable);
    }

    /**
     * Returns text to be read out if accessibility is turned on.
     * @return Text from the {@link #mMessage} if not empty or predefined string for given
     * animation type.
     */
    private CharSequence getAccessibilityText() {
        if (!mMessage.toString().isEmpty()) {
            return mMessage;
        }
        Context context = mOverlayView.getContext();
        CharSequence imageDescription = "";
        switch (mType) {
            case SUCCESS_ANIMATION:
                imageDescription =
                        context.getString(R.string.confirmation_overlay_a11y_description_success);
                break;
            case FAILURE_ANIMATION:
                imageDescription =
                        context.getString(R.string.confirmation_overlay_a11y_description_fail);
                break;
            case OPEN_ON_PHONE_ANIMATION:
                imageDescription =
                        context.getString(R.string.confirmation_overlay_a11y_description_phone);
                break;
            default:
                String errorMessage =
                        String.format(Locale.US, "Invalid ConfirmationOverlay type [%d]", mType);
                throw new IllegalStateException(errorMessage);
        }
        return imageDescription;
    }
}