package com.peachpasswords.ui.security

import androidx.compose.foundation.background
import androidx.compose.foundation.layout.Box
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.padding
import androidx.compose.foundation.shape.RoundedCornerShape
import androidx.compose.runtime.Composable
import androidx.compose.ui.Modifier
import androidx.compose.ui.draw.clip
import androidx.compose.ui.graphics.Color
import androidx.compose.ui.unit.dp
import com.peachpasswords.ui.theme.LocalPeachAccent
import com.peachpasswords.ui.theme.peachColors

/**
 * Amber for the mid-range ("weak"/"fair") fill. PeachColors has no amber token,
 * and the spec calls for one distinct from breach (low) and health (high), so it
 * is defined locally rather than hardcoded inline at each call site.
 */
private val StrengthAmber = Color(0xCCE0A040)

/**
 * Fill color for a given [score], per spec §E1:
 *   0 → breach, 1–2 → amber, 3 → health, 4 → accent.
 */
@Composable
fun strengthColor(score: Int): Color {
    val accent = LocalPeachAccent.current
    return when (score.coerceIn(0, 4)) {
        0 -> peachColors.Breach
        1, 2 -> StrengthAmber
        3 -> peachColors.HealthOk
        else -> accent
    }
}

/**
 * Four-segment strength bar, 4dp tall, full width. The number of *lit* segments
 * follows the spec ramp (1/2/3/4/4 for scores 0..4); unlit segments use T3.
 *
 * Filled-segment count differs from the raw score so score 0 still shows one lit
 * (breach-colored) segment as feedback rather than an empty bar.
 */
@Composable
fun StrengthBar(score: Int, modifier: Modifier = Modifier) {
    val s = score.coerceIn(0, 4)
    val lit = when (s) {
        0 -> 1
        1 -> 2
        2 -> 3
        else -> 4
    }
    val fill = strengthColor(s)
    Row(modifier = modifier.fillMaxWidth()) {
        repeat(4) { i ->
            Box(
                modifier = Modifier
                    .weight(1f)
                    .height(4.dp)
                    .padding(end = if (i < 3) 4.dp else 0.dp)
                    .clip(RoundedCornerShape(2.dp))
                    .background(if (i < lit) fill else peachColors.T3),
            )
        }
    }
}