Dantotsu/app/src/main/java/ani/dantotsu/others/Xpandable.kt

package ani.dantotsu.others

import android.animation.ObjectAnimator
import android.content.Context
import android.util.AttributeSet
import android.widget.LinearLayout
import androidx.core.content.withStyledAttributes
import androidx.core.view.children
import ani.dantotsu.R


class Xpandable @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null
) : LinearLayout(context, attrs) {
    var expanded: Boolean = false
    private var listener: OnChangeListener? = null

    init {
        context.withStyledAttributes(attrs, R.styleable.Xpandable) {
            expanded = getBoolean(R.styleable.Xpandable_isExpanded, expanded)
        }
    }

    override fun onAttachedToWindow() {

        getChildAt(0)!!.setOnClickListener {
            if (expanded) hideAll() else showAll()
            postDelayed({
                expanded = !expanded
            }, 300)
        }

        if (!expanded) children.forEach {
            if (it != getChildAt(0)) {
                it.visibility = GONE
            }
        }
        super.onAttachedToWindow()
    }

    private fun hideAll() {
        children.forEach {
            if (it != getChildAt(0)) {
                ObjectAnimator.ofFloat(it, "scaleY", 1f, 0.5f).setDuration(200).start()
                ObjectAnimator.ofFloat(it, "translationY", 0f, -32f).setDuration(200).start()
                ObjectAnimator.ofFloat(it, "alpha", 1f, 0f).setDuration(200).start()
                it.postDelayed({
                    it.visibility = GONE
                }, 300)
            }
        }
        postDelayed({
            listener?.onRetract()
        }, 300)
    }

    private fun showAll() {
        children.forEach {
            if (it != getChildAt(0)) {
                it.visibility = VISIBLE
                ObjectAnimator.ofFloat(it, "scaleY", 0.5f, 1f).setDuration(200).start()
                ObjectAnimator.ofFloat(it, "translationY", -32f, 0f).setDuration(200).start()
                ObjectAnimator.ofFloat(it, "alpha", 0f, 1f).setDuration(200).start()
            }
        }
        postDelayed({
            listener?.onExpand()
        }, 300)
    }

    @Suppress("unused")
    fun setOnChangeListener(listener: OnChangeListener) {
        this.listener = listener
    }

    interface OnChangeListener {
        fun onExpand()
        fun onRetract()
    }

}