package com.sw.dualscreen.view

import android.content.Context
import android.graphics.*
import android.util.AttributeSet
import android.util.Log
import android.view.View
import androidx.core.content.ContextCompat
import androidx.core.graphics.toColorInt
import kotlin.math.roundToInt

class HollowCircleRectView @JvmOverloads constructor(
    context: Context,
    attrs: AttributeSet? = null,
    defStyleAttr: Int = 0
) : View(context, attrs, defStyleAttr) {

    // 1. 先定义dp值，再统一转px（避免多次转换误差）
    private val rectWidthDp = 400f
    private val rectHeightDp = 510f
    private val circleRadiusDp = 200f // 直径400dp → 半径200dp（固定正圆关键）

    // 2. 转px后的值（只计算一次，避免onDraw重复计算）
    private val rectWidthPx: Float = dp2px(rectWidthDp)
    private val rectHeightPx: Float = dp2px(rectHeightDp)
    private val circleRadiusPx: Float = dp2px(circleRadiusDp)

    // 画笔和路径（复用避免重复创建）
    private val paint = Paint(Paint.ANTI_ALIAS_FLAG)
    private val path = Path()

    init {
//        paint.color = "#FFE7EFF8".toColorInt()
        paint.color = "#FFF4FAFF".toColorInt()
        paint.style = Paint.Style.FILL
        // 强制关闭硬件加速可能的渲染偏差（关键）
        setLayerType(LAYER_TYPE_SOFTWARE, null)
    }

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        // 强制View尺寸为精准px值，避免父布局干扰
        val rectWidthPxInt = rectWidthPx.toInt()
        val rectHeightPxInt = rectHeightPx.toInt()
        Log.d("HollowCircleRectView", "onMeasure: $rectWidthPxInt,$rectHeightPxInt")
        setMeasuredDimension(rectWidthPxInt, rectHeightPxInt)
    }

    override fun onDraw(canvas: Canvas) {
        super.onDraw(canvas)
        path.reset()

        // 1. 添加矩形路径（精准px值，无偏差）
        path.addRect(0f, 0f, rectWidthPx, rectHeightPx, Path.Direction.CW)

        // 2. 添加圆形路径（固定半径，绝对正圆）
        val circleX = rectWidthPx / 2 // 水平居中：200dp转px
        val circleY = rectHeightPx / 2 // 垂直居中：340dp转px
        // 核心修复：用固定半径circleRadiusPx，而非直径/2（避免浮点运算偏差）
        Log.d("HollowCircleRectView", "onDraw: $circleX,$circleY,$circleRadiusPx")
        path.addCircle(circleX, circleY, circleRadiusPx, Path.Direction.CW)

        // 3. 填充规则+绘制
        path.fillType = Path.FillType.EVEN_ODD
        canvas.drawPath(path, paint)
    }

    // 精准dp转px（四舍五入避免小数偏差）
    private fun dp2px(dp: Float): Float {
        val density = context.resources.displayMetrics.density
        return (dp * density).roundToInt().toFloat() // 四舍五入到整数px
    }
}