package com.barcodescanner

import android.content.Context
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.graphics.Rect
import android.graphics.Typeface
import android.util.AttributeSet
import androidx.core.content.ContextCompat
import me.dm7.barcodescanner.core.ViewFinderView

class BarcodeViewFinder : ViewFinderView {
  private var frameWidth: Int? = null
  private var frameHeight: Int? = null
  private var mFramingRect: Rect = Rect(0, 0, 0, 0)
  var viewFinderPositioned: ((x: Float, y: Float) -> Unit)? = null
  private val bounds = Rect()
  private val tutorialTextPaint: Paint by lazy {
    Paint().apply {
      color = Color.WHITE
      textSize = resources.getDimensionPixelSize(R.dimen.tutorial_text_size).toFloat()
      typeface = Typeface.DEFAULT_BOLD
    }
  }
  private val rectBackgroundColor by lazy {
    ContextCompat.getColor(context, R.color.rect_background_color)
  }
  private val rectStrokeColor by lazy {
    ContextCompat.getColor(context, R.color.rect_border_color)
  }

  private val rectTextPaint: Paint by lazy {
    Paint().apply {
      style = Paint.Style.FILL
    }
  }
  private val paddingVertical by lazy {
    resources.getDimensionPixelSize(R.dimen.padding_vertical)
  }

  private val paddingHorizontal by lazy {
    resources.getDimensionPixelSize(R.dimen.padding_horizontal)
  }

  private val radius by lazy {
    resources.getDimensionPixelSize(R.dimen.radius)
  }

  private val marginBottom by lazy {
    resources.getDimensionPixelSize(R.dimen.margin_bottom)
  }

  fun setFrameWidth(width: Int) {
    frameWidth = width
    setupViewFinder()
  }

  fun setFrameHeight(height: Int) {
    frameHeight = height
    setupViewFinder()
  }

  override fun getFramingRect(): Rect {
    return mFramingRect
  }

  constructor(context: Context) : super(context) {
    initView()
  }

  constructor(context: Context?, attributeSet: AttributeSet?) : super(context, attributeSet) {
    initView()
  }

  private fun initView() {
    tutorialTextPaint.getTextBounds(
      context.getString(R.string.center_barcode_in_scanner),
      0,
      context.getString(R.string.center_barcode_in_scanner).length,
      bounds
    )
  }

  private fun getFrameWidth() = frameWidth ?: (width * 0.75f).toInt()
  private fun getFrameHeight() = frameHeight ?: (width * 0.75f * 0.75f).toInt()

  @Synchronized
  override fun updateFramingRect() {
    val left = (width - getFrameWidth()) / 2
    val top = (height - getFrameHeight()) / 2
    mFramingRect = Rect(
      left, top, left + getFrameWidth(), top + getFrameHeight()
    )
    viewFinderPositioned?.invoke(left.toFloat(), top.toFloat())
  }

  override fun onDraw(canvas: Canvas) {
    super.onDraw(canvas)
    rectTextPaint.style = Paint.Style.FILL
    rectTextPaint.color = rectBackgroundColor
    canvas.drawRoundRect(
      (width - bounds.width()) * 1f/2  - paddingHorizontal,
      mFramingRect.top.toFloat() - marginBottom - bounds.height() - 2* paddingVertical,
      (width - bounds.width()) * 1f/2  - paddingHorizontal + bounds.width() + 2*paddingHorizontal,
      mFramingRect.top.toFloat() - marginBottom,
      radius.toFloat(),
      radius.toFloat(),
      rectTextPaint
    )
    rectTextPaint.style = Paint.Style.STROKE
    rectTextPaint.color = rectStrokeColor
    canvas.drawRoundRect(
      (width - bounds.width()) * 1f/2  - paddingHorizontal,
      mFramingRect.top.toFloat() - marginBottom - bounds.height() - 2* paddingVertical,
      (width - bounds.width()) * 1f/2  - paddingHorizontal + bounds.width() + 2*paddingHorizontal,
      mFramingRect.top.toFloat() - marginBottom,
      radius.toFloat(),
      radius.toFloat(),
      rectTextPaint
    )
    canvas.drawText(
      context.getString(R.string.center_barcode_in_scanner),
      (width - bounds.width()) * 1f/2 ,
      mFramingRect.top.toFloat() - marginBottom - paddingVertical,
      tutorialTextPaint)
  }
}