/*
 * UiHelper.kt
 * Implements the UiHelper object
 * A UiHelper provides helper methods for User Interface related tasks
 *
 * This file is part of
 * TRANSISTOR - Radio App for Android
 *
 * Copyright (c) 2015-22 - Y20K.org
 * Licensed under the MIT-License
 * http://opensource.org/licenses/MIT
 */


package com.michatec.radio.helpers

import android.content.Context
import android.graphics.Canvas
import android.graphics.Paint
import android.graphics.PorterDuff
import android.graphics.PorterDuffXfermode
import android.graphics.RectF
import android.view.View
import android.view.ViewGroup
import android.view.inputmethod.InputMethodManager
import androidx.core.content.ContextCompat
import androidx.recyclerview.widget.ItemTouchHelper
import androidx.recyclerview.widget.RecyclerView
import com.michatec.radio.Keys
import com.michatec.radio.R


/*
 * UiHelper object
 */
object UiHelper {

    /* Sets layout margins for given view in DP */
    fun setViewMargins(
        context: Context,
        view: View,
        left: Int = 0,
        right: Int = 0,
        top: Int = 0,
        bottom: Int = 0
    ) {
        val l: Int = (left * ImageHelper.getDensityScalingFactor(context)).toInt()
        val r: Int = (right * ImageHelper.getDensityScalingFactor(context)).toInt()
        val t: Int = (top * ImageHelper.getDensityScalingFactor(context)).toInt()
        val b: Int = (bottom * ImageHelper.getDensityScalingFactor(context)).toInt()
        if (view.layoutParams is ViewGroup.MarginLayoutParams) {
            val p = view.layoutParams as ViewGroup.MarginLayoutParams
            p.setMargins(l, t, r, b)
            view.requestLayout()
        }
    }


    /* Hide keyboard */
    fun hideSoftKeyboard(context: Context, view: View) {
        val imm = context.getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
        imm.hideSoftInputFromWindow(view.windowToken, 0)
    }


    /*
     * Inner class: Callback that detects a swipe to left
     * Credit: https://github.com/kitek/android-rv-swipe-delete/blob/master/app/src/main/java/pl/kitek/rvswipetodelete/SwipeToDeleteCallback.kt
     */
    abstract class SwipeToDeleteCallback(context: Context) :
        ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.LEFT) {

        private val deleteIcon = ContextCompat.getDrawable(context, R.drawable.ic_remove_circle_24dp)
        private val intrinsicWidth: Int = deleteIcon?.intrinsicWidth ?: 0
        private val intrinsicHeight: Int = deleteIcon?.intrinsicHeight ?: 0
        private val backgroundColor = ContextCompat.getColor(context, R.color.list_card_delete_background)
        private val clearPaint: Paint = Paint().apply { xfermode = PorterDuffXfermode(PorterDuff.Mode.CLEAR) }
        private val cornerRadius: Float = dpToPx(context)

        override fun getMovementFlags(
            recyclerView: RecyclerView,
            viewHolder: RecyclerView.ViewHolder
        ): Int {
            // disable swipe for the add new card
            if (viewHolder.itemViewType == Keys.VIEW_TYPE_ADD_NEW) {
                return 0
            }
            return super.getMovementFlags(recyclerView, viewHolder)
        }

        override fun onMove(
            recyclerView: RecyclerView,
            viewHolder: RecyclerView.ViewHolder,
            target: RecyclerView.ViewHolder
        ): Boolean {
            // do nothing
            return false
        }

        override fun onChildDraw(
            c: Canvas,
            recyclerView: RecyclerView,
            viewHolder: RecyclerView.ViewHolder,
            dX: Float,
            dY: Float,
            actionState: Int,
            isCurrentlyActive: Boolean
        ) {
            val itemView = viewHolder.itemView
            val itemHeight = itemView.bottom - itemView.top
            val isCanceled = dX == 0f && !isCurrentlyActive

            if (isCanceled) {
                clearCanvas(
                    c,
                    itemView.right + dX,
                    itemView.top.toFloat(),
                    itemView.right.toFloat(),
                    itemView.bottom.toFloat()
                )
                super.onChildDraw(
                    c,
                    recyclerView,
                    viewHolder,
                    dX,
                    dY,
                    actionState,
                    false
                )
                return
            }

            // draw delete and rounded background
            val roundedBackground = RectF(
                itemView.left.toFloat(),
                itemView.top.toFloat(),
                itemView.right.toFloat(),
                itemView.bottom.toFloat()
            )

            val paint = Paint()
            paint.color = backgroundColor
            c.drawRoundRect(roundedBackground, cornerRadius, cornerRadius, paint)

            // calculate position of delete icon
            val deleteIconTop = itemView.top + (itemHeight - intrinsicHeight) / 2
            val deleteIconMargin = (itemHeight - intrinsicHeight) / 2
            val deleteIconLeft = itemView.right - deleteIconMargin - intrinsicWidth
            val deleteIconRight = itemView.right - deleteIconMargin
            val deleteIconBottom = deleteIconTop + intrinsicHeight

            // draw delete icon
            deleteIcon?.setBounds(deleteIconLeft, deleteIconTop, deleteIconRight, deleteIconBottom)
            deleteIcon?.draw(c)

            super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
        }

        private fun clearCanvas(c: Canvas?, left: Float, top: Float, right: Float, bottom: Float) {
            c?.drawRect(left, top, right, bottom, clearPaint)
        }

        // conversion from dp to px
        private fun dpToPx(context: Context): Float {
            val density = context.resources.displayMetrics.density
            return 24 * density
        }
    }
    /*
     * End of inner class
     */


    /*
     * Inner class: Callback that detects a swipe to left
     * Credit: https://github.com/kitek/android-rv-swipe-delete/blob/master/app/src/main/java/pl/kitek/rvswipetodelete/SwipeToDeleteCallback.kt
     */
    abstract class SwipeToMarkStarredCallback(context: Context) :
        ItemTouchHelper.SimpleCallback(0, ItemTouchHelper.RIGHT) {

        private val starIcon = ContextCompat.getDrawable(context, R.drawable.ic_favorite_24dp)
        private val intrinsicWidth: Int = starIcon?.intrinsicWidth ?: 0
        private val intrinsicHeight: Int = starIcon?.intrinsicHeight ?: 0
        private val backgroundColor = ContextCompat.getColor(context, R.color.list_card_mark_starred_background)
        private val clearPaint: Paint = Paint().apply { xfermode = PorterDuffXfermode(PorterDuff.Mode.CLEAR) }
        private val cornerRadius: Float = dpToPx(context)

        override fun getMovementFlags(
            recyclerView: RecyclerView,
            viewHolder: RecyclerView.ViewHolder
        ): Int {
            // disable swipe for the add new card
            if (viewHolder.itemViewType == Keys.VIEW_TYPE_ADD_NEW) {
                return 0
            }
            return super.getMovementFlags(recyclerView, viewHolder)
        }

        override fun onMove(
            recyclerView: RecyclerView,
            viewHolder: RecyclerView.ViewHolder,
            target: RecyclerView.ViewHolder
        ): Boolean {
            // do nothing
            return false
        }

        override fun onChildDraw(
            c: Canvas,
            recyclerView: RecyclerView,
            viewHolder: RecyclerView.ViewHolder,
            dX: Float,
            dY: Float,
            actionState: Int,
            isCurrentlyActive: Boolean
        ) {
            val itemView = viewHolder.itemView
            val itemHeight = itemView.bottom - itemView.top
            val isCanceled = dX == 0f && !isCurrentlyActive

            if (isCanceled) {
                clearCanvas(
                    c,
                    itemView.right + dX,
                    itemView.top.toFloat(),
                    itemView.right.toFloat(),
                    itemView.bottom.toFloat()
                )
                super.onChildDraw(
                    c,
                    recyclerView,
                    viewHolder,
                    dX,
                    dY,
                    actionState,
                    false
                )
                return
            }

            // draw favorite color and rounded background
            val roundedBackground = RectF(
                itemView.left.toFloat(),
                itemView.top.toFloat(),
                itemView.right.toFloat(),
                itemView.bottom.toFloat()
            )

            val paint = Paint()
            paint.color = backgroundColor
            c.drawRoundRect(roundedBackground, cornerRadius, cornerRadius, paint)

            // calculate position of delete icon
            val deleteIconTop = itemView.top + (itemHeight - intrinsicHeight) / 2
            val deleteIconMargin = (itemHeight - intrinsicHeight) / 2
            val deleteIconLeft = itemView.left + deleteIconMargin
            val deleteIconRight = itemView.left + deleteIconMargin + intrinsicWidth
            val deleteIconBottom = deleteIconTop + intrinsicHeight

            // draw delete icon
            starIcon?.setBounds(deleteIconLeft, deleteIconTop, deleteIconRight, deleteIconBottom)
            starIcon?.draw(c)

            super.onChildDraw(c, recyclerView, viewHolder, dX, dY, actionState, isCurrentlyActive)
        }

        private fun clearCanvas(c: Canvas?, left: Float, top: Float, right: Float, bottom: Float) {
            c?.drawRect(left, top, right, bottom, clearPaint)
        }

        // conversion from dp to px
        private fun dpToPx(context: Context): Float {
            val density = context.resources.displayMetrics.density
            return 24 * density
        }
    }
    /*
     * End of inner class
     */


}