LazyColumnItemsOnCard.kt

private data class Border(val strokeWidth: Dp, val cornerRadius: Dp, val color: Color)

fun Modifier.bookCardBackground(
    itemIndex: Int,
    allItemsSize: Int
): Modifier {

    val border = Border(
        strokeWidth = 1.dp,
        cornerRadius = 16.dp,
        color = Color.Green
    )

    return when {
        allItemsSize <= 1 -> this.then(theOnlyItemStroke(border))
        itemIndex == 0 -> this.then(firstItemStroke(border))
        itemIndex == allItemsSize - 1 -> this.then(lastItemStroke(border))
        else -> this.then(middleItemStroke(border))
    }.fillMaxSize()
}


private fun Modifier.theOnlyItemStroke(border: Border): Modifier = this.then(
    border(
        width = border.strokeWidth,
        color = border.color,
        shape = RoundedCornerShape(border.cornerRadius)
    ).clip(RoundedCornerShape(border.cornerRadius))
)

private fun Modifier.firstItemStroke(border: Border): Modifier = this
    .then(
        itemStroke(border) { brush, stroke, cornerRadius ->
            drawRoundRect(
                brush = brush,
                topLeft = Offset(
                    stroke.width / 2,
                    stroke.width / 2
                ),
                size = Size(
                    size.width - stroke.width,
                    size.height - stroke.width / 2 + cornerRadius.y // clip the stroke from bottom
                ),
                style = stroke,
                cornerRadius = cornerRadius
            )
        }
    )
    .clip(RoundedCornerShape(topStart = border.cornerRadius, topEnd = border.cornerRadius))

private fun Modifier.lastItemStroke(border: Border): Modifier = this
    .then(
        itemStroke(border) { brush, stroke, cornerRadius ->
            drawRoundRect(
                brush = brush,
                topLeft = Offset(
                    stroke.width / 2,
                    stroke.width / 2 - cornerRadius.y //clip the stroke from top
                ),
                size = Size(
                    size.width - stroke.width,
                    size.height - stroke.width / 2 + cornerRadius.y //adjust stroke length at the bottom
                ),
                style = stroke,
                cornerRadius = cornerRadius
            )
        }
    )
    .clip(RoundedCornerShape(bottomStart = border.cornerRadius, bottomEnd = border.cornerRadius))


private fun Modifier.middleItemStroke(border: Border): Modifier = this.then(
    itemStroke(border){ brush, stroke, _ ->
        drawRect(
            brush = brush,
            topLeft = Offset(
                stroke.width / 2,
                -stroke.width //clip the stroke from top
            ),
            size = Size(
                size.width - stroke.width,
                size.height + stroke.width * 2 //clip the stroke from bottom
            ),
            style = stroke
        )
    }
)

private fun Modifier.itemStroke(
    border: Border,
    drawBorder: DrawScope.(Brush, Stroke, CornerRadius) -> Unit
): Modifier = this.then(
    Modifier.drawWithCache {
        val brush = SolidColor(border.color)
        val stroke = Stroke(border.strokeWidth.toPx())
        val cornerRadius = CornerRadius(border.cornerRadius.toPx(), border.cornerRadius.toPx())
        onDrawWithContent {
            drawContent()
            clipRect { drawBorder(brush, stroke, cornerRadius) }
        }
    }
)