/*
 * Copyright (c) 2025 Vitor Pamplona
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to use,
 * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
 * Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package com.vitorpamplona.relaybench

/** Latency distribution summary, in milliseconds. */
data class Percentiles(
    val samples: Int,
    val mean: Double,
    val p50: Double,
    val p90: Double,
    val p99: Double,
    val max: Double,
) {
    companion object {
        fun ofNanos(nanos: List<Long>): Percentiles {
            if (nanos.isEmpty()) return Percentiles(0, 0.0, 0.0, 0.0, 0.0, 0.0)
            val sorted = nanos.sorted()

            fun pct(p: Double): Double {
                val idx = ((sorted.size - 1) * p).toInt()
                return sorted[idx] / 1_000_000.0
            }
            return Percentiles(
                samples = sorted.size,
                mean = sorted.average() / 1_000_000.0,
                p50 = pct(0.50),
                p90 = pct(0.90),
                p99 = pct(0.99),
                max = sorted.last() / 1_000_000.0,
            )
        }
    }
}