/*
 * Copyright (c) 2022 Proton AG
 *
 * This file is part of Proton Mail.
 *
 * Proton Mail is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Proton Mail is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Proton Mail. If not, see https://www.gnu.org/licenses/.
 */
package ch.protonmail.android.activities.messageDetails.body

import android.view.MotionEvent
import android.view.ScaleGestureDetector
import android.view.View
import android.view.ViewParent
import android.webkit.WebView

internal class MessageBodyTouchListener(
    private val wvScrollView: ViewParent,
    private val scaleDetector: ScaleGestureDetector,
    private val scaledTouchSlop: Int
) : View.OnTouchListener {

    private var mDownX = 0f
    private var mDownY = 0f

    override fun onTouch(v: View, motionEvent: MotionEvent): Boolean {
        if (v is WebView) {
            when (motionEvent.actionMasked) {
                MotionEvent.ACTION_DOWN -> {
                    mDownX = motionEvent.rawX
                    mDownY = motionEvent.rawY
                }
                MotionEvent.ACTION_MOVE -> {
                    val deltaX = motionEvent.rawX - mDownX
                    val deltaY = motionEvent.rawY - mDownY
                    if (Math.abs(deltaX) > scaledTouchSlop && Math.abs(
                            deltaY
                        ) < scaledTouchSlop || motionEvent.pointerCount > 1
                    ) {
                        wvScrollView.requestDisallowInterceptTouchEvent(true)
                    }
                }
                MotionEvent.ACTION_UP -> {
                    mDownX = 0f
                    mDownY = 0f
                    wvScrollView.requestDisallowInterceptTouchEvent(false)
                }
                MotionEvent.ACTION_CANCEL -> {
                    mDownX = 0f
                    mDownY = 0f
                    wvScrollView.requestDisallowInterceptTouchEvent(false)
                }
                else -> {
                    // NO OP
                }
            }
        }
        scaleDetector.onTouchEvent(motionEvent)
        return false
    }
}