package com.peachpasswords.ui.components

import androidx.compose.foundation.Canvas
import androidx.compose.foundation.layout.size
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.runtime.produceState
import androidx.compose.ui.Modifier
import androidx.compose.ui.geometry.Offset
import androidx.compose.ui.geometry.Size
import androidx.compose.ui.graphics.StrokeCap
import androidx.compose.ui.graphics.drawscope.Stroke
import androidx.compose.ui.unit.Dp
import androidx.compose.ui.unit.dp
import com.peachpasswords.ui.theme.LocalPeachAccent
import com.peachpasswords.ui.theme.peachColors
import com.peachpasswords.vault.TOTPGenerator
import kotlinx.coroutines.delay

/**
 * A small ring that sweeps once per TOTP period and turns breach-red in the
 * final 5 seconds. Port of the brief's TOTPRing.
 */
@Composable
fun TOTPRing(modifier: Modifier = Modifier, size: Dp = 28.dp) {
    val accent = LocalPeachAccent.current
    val progress by produceState(TOTPGenerator.periodProgress()) {
        while (true) { value = TOTPGenerator.periodProgress(); delay(100) }
    }
    val isHot = TOTPGenerator.remainingSeconds() <= 5
    val track = peachColors.T3
    val breach = peachColors.Breach

    Canvas(modifier = modifier.size(size)) {
        val stroke = 2.dp.toPx()
        val radius = (this.size.minDimension - stroke) / 2f
        val center = Offset(this.size.width / 2f, this.size.height / 2f)
        drawCircle(color = track, radius = radius, style = Stroke(stroke))
        drawArc(
            color = if (isHot) breach else accent,
            startAngle = -90f,
            // Starts full at period start (progress=0), depletes to empty as the
            // code approaches expiry (progress=1) — the conventional countdown
            // direction, not "fills up as time passes."
            sweepAngle = 360f * (1f - progress),
            useCenter = false,
            style = Stroke(stroke, cap = StrokeCap.Round),
            topLeft = Offset(center.x - radius, center.y - radius),
            size = Size(radius * 2, radius * 2),
        )
    }
}