/*
 * Copyright (C) 2015 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.phone;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.Nullable;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ResolveInfo;
import android.telephony.TelephonyManager;
import android.text.Layout;
import android.text.TextUtils;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewAnimationUtils;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityManager;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.TextView;

import java.util.List;

public class EmergencyActionGroup extends FrameLayout implements View.OnClickListener {

    private static final long HIDE_DELAY = 3000;
    private static final int RIPPLE_DURATION = 600;
    private static final long RIPPLE_PAUSE = 1000;

    private final Interpolator mFastOutLinearInInterpolator;

    private ViewGroup mSelectedContainer;
    private TextView mSelectedLabel;
    private View mRippleView;
    private View mLaunchHint;

    private View mLastRevealed;

    private MotionEvent mPendingTouchEvent;

    private boolean mHiding;

    public EmergencyActionGroup(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        mFastOutLinearInInterpolator = AnimationUtils.loadInterpolator(context,
                android.R.interpolator.fast_out_linear_in);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    @Override
    protected void onFinishInflate() {
        super.onFinishInflate();

        mSelectedContainer = (ViewGroup) findViewById(R.id.selected_container);
        mSelectedContainer.setOnClickListener(this);
        mSelectedLabel = (TextView) findViewById(R.id.selected_label);
        mSelectedLabel.addOnLayoutChangeListener(mLayoutChangeListener);
        mRippleView = findViewById(R.id.ripple_view);
        mLaunchHint = findViewById(R.id.launch_hint);
        mLaunchHint.addOnLayoutChangeListener(mLayoutChangeListener);
    }

    @Override
    protected void onWindowVisibilityChanged(int visibility) {
        super.onWindowVisibilityChanged(visibility);
        if (visibility == View.VISIBLE) {
            setupAssistActions();
        }
    }

    /**
     * Called by the activity before a touch event is dispatched to the view hierarchy.
     */
    public void onPreTouchEvent(MotionEvent event) {
        mPendingTouchEvent = event;
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent event) {
        boolean handled = super.dispatchTouchEvent(event);
        if (mPendingTouchEvent == event && handled) {
            mPendingTouchEvent = null;
        }
        return handled;
    }

    /**
     * Called by the activity after a touch event is dispatched to the view hierarchy.
     */
    public void onPostTouchEvent(MotionEvent event) {
        // Hide the confirmation button if a touch event was delivered to the activity but not to
        // this view.
        if (mPendingTouchEvent != null) {
            hideTheButton();
        }
        mPendingTouchEvent = null;
    }

    private void setupAssistActions() {
        int[] buttonIds = new int[] {R.id.action1, R.id.action2, R.id.action3};

        List<ResolveInfo> infos;

        if (TelephonyManager.EMERGENCY_ASSISTANCE_ENABLED) {
            infos = EmergencyAssistanceHelper.resolveAssistPackageAndQueryActivities(getContext());
        } else {
            infos = null;
        }

        for (int i = 0; i < 3; i++) {
            Button button = (Button) findViewById(buttonIds[i]);
            boolean visible = false;

            button.setOnClickListener(this);

            if (infos != null && infos.size() > i && infos.get(i) != null) {
                ResolveInfo info = infos.get(i);
                ComponentName name = EmergencyAssistanceHelper.getComponentName(info);

                button.setTag(R.id.tag_intent,
                        new Intent(EmergencyAssistanceHelper.getIntentAction())
                                .setComponent(name));
                button.setText(info.loadLabel(getContext().getPackageManager()));
                visible = true;
            }

            button.setVisibility(visible ? View.VISIBLE : View.GONE);
        }
    }

    @Override
    public void onClick(View v) {
        Intent intent = (Intent) v.getTag(R.id.tag_intent);

        if (v.getId() == R.id.action1 || v.getId() == R.id.action2 || v.getId() == R.id.action3) {
            AccessibilityManager accessibilityMgr =
                    (AccessibilityManager) getContext().getSystemService(
                            Context.ACCESSIBILITY_SERVICE);
            if (accessibilityMgr.isTouchExplorationEnabled()) {
                getContext().startActivity(intent);
            } else {
                revealTheButton(v);
            }
        } else if (v.getId() == R.id.selected_container) {
            if (!mHiding) {
                getContext().startActivity(intent);
            }
        }
    }

    private void revealTheButton(View v) {
        CharSequence buttonText = ((Button) v).getText();
        mSelectedLabel.setText(buttonText);
        mSelectedLabel.setAutoSizeTextTypeWithDefaults(TextView.AUTO_SIZE_TEXT_TYPE_UNIFORM);

        // In order to trigger OnLayoutChangeListener for reset default minimum font size.
        mSelectedLabel.requestLayout();
        mLaunchHint.requestLayout();

        mSelectedContainer.setVisibility(VISIBLE);
        int centerX = v.getLeft() + v.getWidth() / 2;
        int centerY = v.getTop() + v.getHeight() / 2;
        Animator reveal = ViewAnimationUtils.createCircularReveal(
                mSelectedContainer,
                centerX,
                centerY,
                0,
                Math.max(centerX, mSelectedContainer.getWidth() - centerX)
                        + Math.max(centerY, mSelectedContainer.getHeight() - centerY));
        reveal.start();

        animateHintText(mSelectedLabel, v, reveal);
        animateHintText(mLaunchHint, v, reveal);

        mSelectedContainer.setTag(R.id.tag_intent, v.getTag(R.id.tag_intent));
        mLastRevealed = v;
        postDelayed(mHideRunnable, HIDE_DELAY);
        postDelayed(mRippleRunnable, RIPPLE_PAUSE / 2);

        // Transfer focus from the originally clicked button to the expanded button.
        mSelectedContainer.requestFocus();
    }


    private final OnLayoutChangeListener mLayoutChangeListener = new OnLayoutChangeListener() {
        @Override
        public void onLayoutChange(View v, int left, int top, int right, int bottom,
                int oldLeft,
                int oldTop, int oldRight, int oldBottom) {
            decreaseAutoSizeMinTextSize(v);
        }
    };

    /**
     * Prevent some localization string will be truncated if there is low resolution screen
     * or font size and display size of setting is largest.
     */
    private void decreaseAutoSizeMinTextSize(View selectedView) {
        if (selectedView != null) {
            if (selectedView instanceof TextView) {
                TextView textView = (TextView) selectedView;
                textView.setEllipsize(TextUtils.TruncateAt.END);

                // The textView layout will be null due to it's property is hiding when
                // initialization.
                Layout layout = textView.getLayout();
                if (layout != null) {
                    if (layout.getEllipsisCount(textView.getMaxLines() - 1) > 0) {
                        textView.setAutoSizeTextTypeUniformWithConfiguration(
                                8,
                                textView.getAutoSizeMaxTextSize(),
                                textView.getAutoSizeStepGranularity(),
                                TypedValue.COMPLEX_UNIT_SP);
                        textView.setGravity(Gravity.CENTER);
                    }
                }
            }
        }
    }

    private void animateHintText(View selectedView, View v, Animator reveal) {
        selectedView.setTranslationX(
                (v.getLeft() + v.getWidth() / 2 - mSelectedContainer.getWidth() / 2) / 5);
        selectedView.animate()
                .setDuration(reveal.getDuration() / 3)
                .setStartDelay(reveal.getDuration() / 5)
                .translationX(0)
                .setInterpolator(mFastOutLinearInInterpolator)
                .start();
    }

    private void hideTheButton() {
        if (mHiding || mSelectedContainer.getVisibility() != VISIBLE) {
            return;
        }

        mHiding = true;

        removeCallbacks(mHideRunnable);

        View v = mLastRevealed;
        int centerX = v.getLeft() + v.getWidth() / 2;
        int centerY = v.getTop() + v.getHeight() / 2;
        Animator reveal = ViewAnimationUtils.createCircularReveal(
                mSelectedContainer,
                centerX,
                centerY,
                Math.max(centerX, mSelectedContainer.getWidth() - centerX)
                        + Math.max(centerY, mSelectedContainer.getHeight() - centerY),
                0);
        reveal.addListener(new AnimatorListenerAdapter() {
            @Override
            public void onAnimationEnd(Animator animation) {
                mSelectedContainer.setVisibility(INVISIBLE);
                removeCallbacks(mRippleRunnable);
                mHiding = false;
            }
        });
        reveal.start();

        // Transfer focus back to the originally clicked button.
        if (mSelectedContainer.isFocused()) {
            v.requestFocus();
        }
    }

    private void startRipple() {
        final View ripple = mRippleView;
        ripple.animate().cancel();
        ripple.setVisibility(VISIBLE);
        Animator reveal = ViewAnimationUtils.createCircularReveal(
                ripple,
                ripple.getLeft() + ripple.getWidth() / 2,
                ripple.getTop() + ripple.getHeight() / 2,
                0,
                ripple.getWidth() / 2);
        reveal.setDuration(RIPPLE_DURATION);
        reveal.start();

        ripple.setAlpha(0);
        ripple.animate().alpha(1).setDuration(RIPPLE_DURATION / 2)
                .withEndAction(new Runnable() {
            @Override
            public void run() {
                ripple.animate().alpha(0).setDuration(RIPPLE_DURATION / 2)
                        .withEndAction(new Runnable() {
                            @Override
                            public void run() {
                                ripple.setVisibility(INVISIBLE);
                                postDelayed(mRippleRunnable, RIPPLE_PAUSE);
                            }
                        }).start();
            }
        }).start();
    }

    private final Runnable mHideRunnable = new Runnable() {
        @Override
        public void run() {
            if (!isAttachedToWindow()) return;
            hideTheButton();
        }
    };

    private final Runnable mRippleRunnable = new Runnable() {
        @Override
        public void run() {
            if (!isAttachedToWindow()) return;
            startRipple();
        }
    };
}