package org.autojs.autojs.ui.widget;

/*
 * Copyright (C) 2015 takahirom
 *
 * 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.
 */

import android.content.Context;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.webkit.WebView;

import androidx.core.view.NestedScrollingChild;
import androidx.core.view.NestedScrollingChildHelper;
import androidx.core.view.ViewCompat;

import org.autojs.autojs.ui.pager.ViewPager;

public class NestedWebView extends WebView implements NestedScrollingChild {
    private int mLastY;
    private final int[] mScrollOffset = new int[2];
    private final int[] mScrollConsumed = new int[2];
    private int mNestedOffsetY;
    private final NestedScrollingChildHelper mChildHelper;

    public NestedWebView(Context context) {
        this(context, null);
    }

    public NestedWebView(Context context, AttributeSet attrs) {
        this(context, attrs, android.R.attr.webViewStyle);
    }

    public NestedWebView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mChildHelper = new NestedScrollingChildHelper(this);
        setNestedScrollingEnabled(true);
    }

    // @Comment by SuperMonster003 on Oct 14, 2022.
    //  ! Will "fix" the swipe-refresh problem on documentation viewpager.
    //  ! But the side effect has left unknown.

    // @Override
    // public boolean onTouchEvent(MotionEvent ev) {
    //     boolean returnValue = false;
    //
    //     MotionEvent event = MotionEvent.obtain(ev);
    //     // final int action = MotionEventCompat.getActionMasked(event);
    //     final int action = event.getAction();
    //     if (action == MotionEvent.ACTION_DOWN) {
    //         mNestedOffsetY = 0;
    //     }
    //     int eventY = (int) event.getY();
    //     event.offsetLocation(0, mNestedOffsetY);
    //     switch (action) {
    //         case MotionEvent.ACTION_MOVE -> {
    //             int deltaY = mLastY - eventY;
    //             // NestedPreScroll
    //             if (dispatchNestedPreScroll(0, deltaY, mScrollConsumed, mScrollOffset)) {
    //                 deltaY -= mScrollConsumed[1];
    //                 mLastY = eventY - mScrollOffset[1];
    //                 event.offsetLocation(0, -mScrollOffset[1]);
    //                 mNestedOffsetY += mScrollOffset[1];
    //             }
    //             returnValue = super.onTouchEvent(event);
    //
    //             // NestedScroll
    //             if (dispatchNestedScroll(0, mScrollOffset[1], 0, deltaY, mScrollOffset)) {
    //                 event.offsetLocation(0, mScrollOffset[1]);
    //                 mNestedOffsetY += mScrollOffset[1];
    //                 mLastY -= mScrollOffset[1];
    //             }
    //         }
    //         case MotionEvent.ACTION_DOWN -> {
    //             returnValue = super.onTouchEvent(event);
    //             mLastY = eventY;
    //             // start NestedScroll
    //             startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
    //         }
    //         case MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
    //             returnValue = super.onTouchEvent(event);
    //             // end NestedScroll
    //             stopNestedScroll();
    //         }
    //     }
    //     return returnValue;
    // }

    // FIXME by SuperMonster003 on Jul 28, 2022.
    //  ! Code `ViewPager.setPageScrollEnabled(boolean)`
    //  ! in the following overridden methods
    //  ! - 1 - onInterceptTouchEvent
    //  ! - 2 - onOverScrolled
    //  ! existed only for disabling "Documents" ViewPager
    //  ! from scrolling horizontally when swiping in the area of code.
    //  ! A more elegant way is needed (for sure).

    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        ViewPager.setPageScrollEnabled(false);
        return super.onInterceptTouchEvent(ev);
    }

    @Override
    protected void onOverScrolled(int scrollX, int scrollY, boolean clampedX, boolean clampedY) {
        super.onOverScrolled(scrollX, scrollY, clampedX, clampedY);
        ViewPager.setPageScrollEnabled(true);
    }

    // Nested Scroll implements
    @Override
    public void setNestedScrollingEnabled(boolean enabled) {
        mChildHelper.setNestedScrollingEnabled(enabled);
    }

    @Override
    public boolean isNestedScrollingEnabled() {
        return mChildHelper.isNestedScrollingEnabled();
    }

    @Override
    public boolean startNestedScroll(int axes) {
        return mChildHelper.startNestedScroll(axes);
    }

    @Override
    public void stopNestedScroll() {
        mChildHelper.stopNestedScroll();
    }

    @Override
    public boolean hasNestedScrollingParent() {
        return mChildHelper.hasNestedScrollingParent();
    }

    @Override
    public boolean dispatchNestedScroll(int dxConsumed, int dyConsumed, int dxUnconsumed, int dyUnconsumed,
                                        int[] offsetInWindow) {
        return mChildHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, offsetInWindow);
    }

    @Override
    public boolean dispatchNestedPreScroll(int dx, int dy, int[] consumed, int[] offsetInWindow) {
        return mChildHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow);
    }

    @Override
    public boolean dispatchNestedFling(float velocityX, float velocityY, boolean consumed) {
        return mChildHelper.dispatchNestedFling(velocityX, velocityY, consumed);
    }

    @Override
    public boolean dispatchNestedPreFling(float velocityX, float velocityY) {
        return mChildHelper.dispatchNestedPreFling(velocityX, velocityY);
    }

}