package jp.juggler.subwaytooter.view

import android.text.Spannable
import android.text.method.LinkMovementMethod
import android.text.method.Touch
import android.text.style.ClickableSpan
import android.view.MotionEvent
import android.widget.TextView
import jp.juggler.subwaytooter.util.LogCategory

object MyLinkMovementMethod : LinkMovementMethod() {
	
	private val log = LogCategory("MyLinkMovementMethod")
	
	// 改行より右をタッチしても反応しないようにする
	override fun onTouchEvent(widget : TextView, buffer : Spannable, event : MotionEvent) : Boolean {
		
		val action = event.action
		
		if(action != MotionEvent.ACTION_UP && action != MotionEvent.ACTION_DOWN) {
			return Touch.onTouchEvent(widget, buffer, event)
		}
		
		var x = event.x.toInt()
		var y = event.y.toInt()
		
		x -= widget.totalPaddingLeft
		y -= widget.totalPaddingTop
		
		x += widget.scrollX
		y += widget.scrollY
		
		val layout = widget.layout
		
		val line = layout.getLineForVertical(y)
		if(0 <= line && line < layout.lineCount) {
			
			val line_left = layout.getLineLeft(line)
			val line_right = layout.getLineRight(line)
			if(line_left <= x && x <= line_right) {
				
				val offset = try{
					layout.getOffsetForHorizontal(line, x.toFloat())
				}catch(ex:Throwable){
					// getOffsetForHorizontal raises error on Xiaomi Mi A1（tissot_sprout）, Android 8.1
					log.trace(ex,"getOffsetForHorizontal failed.")
					null
				}

				if( offset != null){
					val link = buffer.getSpans(offset, offset, ClickableSpan::class.java)
					if(link != null && link.isNotEmpty()) {
						
						if(action == MotionEvent.ACTION_UP) {
							link[0].onClick(widget)
						}
						if(widget is MyTextView) {
							widget.linkHit = true
						}
						return true
					}
				}
			}
		}
		
		Touch.onTouchEvent(widget, buffer, event)
		return false
	}
	
}