package io.xdrm.lebonprix.anim

import android.content.res.Resources
import android.graphics.*
import android.graphics.drawable.BitmapDrawable
import android.graphics.drawable.ShapeDrawable
import android.graphics.drawable.shapes.RectShape
import android.util.Log
import android.view.View
import android.view.animation.Animation
import android.view.animation.Transformation
import android.widget.ImageView

class UnderlineAnimation(val target: ImageView?) : Animation() {
    private val width  : Int   = 1000
    private var cursor : Float = 0F
    private var start  : Float = 0F
    private var end    : Float = 0F

    private var bitmap   : Bitmap  = Bitmap.createBitmap(width, 5, Bitmap.Config.ARGB_8888)
    private var canvas   : Canvas  = Canvas(this.bitmap)

    init {
        draw()
    }

    fun during(durationMillis: Long) : UnderlineAnimation{
        super.setDuration(durationMillis)
        return this
    }

    // sets the animation range
    fun animate(_start: Float, _end : Float) : UnderlineAnimation{
        // ignore animation if already at (or going for) the end state
        if( _end == cursor || !hasEnded() && _end == end )
            return UnderlineAnimation(null)

        start = _start
        end   = _end
        return this
    }

    override fun start() {
        if( target == null )
            return

        target.startAnimation(this)
    }

    // sets the animation range
    fun animateContinue(_end : Float) : UnderlineAnimation{
        start = cursor
        end   = _end
        return this
    }

    override fun applyTransformation(interpolatedTime: Float, t: Transformation?) {
        super.applyTransformation(interpolatedTime, t)
        cursor = start + (end - start) * interpolatedTime
        draw()
    }

    private fun draw(){
        // clear canvas
        canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR)

        // set up taint (WHITE)
        val taint = Paint()
        taint.color = Color.WHITE

        // draw rect
        val size = cursor*width
        val offset = (width-size)/2
        canvas.drawRect(0F, 0F, size, 5F, taint)

        // display on target
        if( target != null )
            target.setImageBitmap(bitmap)
    }

}