package uts.sdk.modules.masCodeScan

import android.content.Context
import android.graphics.Bitmap
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Paint
import android.graphics.RectF
import android.graphics.Typeface
import android.view.View
import kotlin.math.min

/**
 * 连续扫码成功提示层：覆盖扫描框中部，显示成功状态和本次扫码值。
 */
class ContinuousSuccessOverlayView(
    context: Context,
    private val successHint: String
) : View(context) {
    private val density = resources.displayMetrics.density
    private val scaledDensity = resources.displayMetrics.scaledDensity
    private val panelPaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
        color = Color.argb(218, 48, 48, 48)
        style = Paint.Style.FILL
    }
    private val titlePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
        color = Color.WHITE
        textSize = 16f * scaledDensity
        textAlign = Paint.Align.CENTER
        typeface = Typeface.DEFAULT_BOLD
    }
    private val valuePaint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
        color = Color.WHITE
        textSize = 15f * scaledDensity
        textAlign = Paint.Align.CENTER
    }
    private val panelRect = RectF()
    private var frameRect = RectF()
    private var stillFrame: Bitmap? = null
    private var value = ""

    fun showSuccess(scanFrame: RectF, content: String, bitmap: Bitmap?) {
        stillFrame?.recycle()
        stillFrame = bitmap
        frameRect = RectF(scanFrame)
        value = content
        visibility = VISIBLE
        invalidate()
    }

    fun hideSuccess() {
        stillFrame?.recycle()
        stillFrame = null
        value = ""
        visibility = GONE
        invalidate()
    }

    override fun onDraw(canvas: Canvas) {
        super.onDraw(canvas)
        if (value.isBlank() || width <= 0 || height <= 0) return

        stillFrame?.takeIf { !it.isRecycled && it.width > 0 && it.height > 0 }?.let { bitmap ->
            val bitmapWidth = bitmap.width.toFloat()
            val bitmapHeight = bitmap.height.toFloat()
            val scale = maxOf(width / bitmapWidth, height / bitmapHeight)
            val drawWidth = bitmapWidth * scale
            val drawHeight = bitmapHeight * scale
            val left = (width - drawWidth) / 2f
            val top = (height - drawHeight) / 2f
            canvas.drawBitmap(bitmap, null, RectF(left, top, left + drawWidth, top + drawHeight), null)
        }

        val availableWidth = if (frameRect.isEmpty) width.toFloat() else frameRect.width()
        val panelWidth = min(300f * density, maxOf(0f, availableWidth - 24f * density))
        val panelHeight = 68f * density
        val centerX = if (frameRect.isEmpty) width / 2f else frameRect.centerX()
        val centerY = if (frameRect.isEmpty) height / 2f else frameRect.centerY()
        panelRect.set(
            centerX - panelWidth / 2f,
            centerY - panelHeight / 2f,
            centerX + panelWidth / 2f,
            centerY + panelHeight / 2f
        )
        panelRect.left = panelRect.left.coerceAtLeast(12f * density)
        panelRect.right = panelRect.right.coerceAtMost(width - 12f * density)
        panelRect.top = panelRect.top.coerceAtLeast(24f * density)
        panelRect.bottom = panelRect.bottom.coerceAtMost(height - 24f * density)

        canvas.drawRoundRect(panelRect, 12f * density, 12f * density, panelPaint)
        val titleBaseline = panelRect.centerY() - 3f * density
        val valueBaseline = panelRect.centerY() + 19f * density
        canvas.drawText(successHint, panelRect.centerX(), titleBaseline, titlePaint)
        canvas.drawText(value, panelRect.centerX(), valueBaseline, valuePaint)
    }
}