/*
 * Copyright (c) 2024 AtLarge Research
 *
 * 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.
 */

@file:OptIn(InternalUse::class, NonInlinableUnit::class)

package org.opendc.common.units

import kotlinx.serialization.Serializable
import org.opendc.common.annotations.InternalUse
import org.opendc.common.units.TimeDelta.Companion.toTimeDelta
import org.opendc.common.utils.DFLT_MIN_EPS
import org.opendc.common.utils.approx
import org.opendc.common.utils.approxLarger
import org.opendc.common.utils.approxLargerOrEq
import org.opendc.common.utils.approxSmaller
import org.opendc.common.utils.approxSmallerOrEq
import org.opendc.common.utils.ifNeg0thenPos0
import java.time.Duration

/**
 * Represents data-rate values.
 * @see[Unit]
 */
@JvmInline
@Serializable(with = DataRate.Companion.DataRateSerializer::class)
public value class DataRate private constructor(
    // In bits/s.
    override val value: Double,
) : Unit<DataRate> {
    override fun toString(): String = fmtValue()

    public override fun fmtValue(fmt: String): String =
        when (abs()) {
            in zero..ofBps(100) -> "${String.format(fmt, tobps())} bps"
            in ofbps(100)..ofKbps(100) -> "${String.format(fmt, toKbps())} Kbps"
            in ofKbps(100)..ofMbps(100) -> "${String.format(fmt, toMbps())} Mbps"
            else -> "${String.format(fmt, toGbps())} Gbps"
        }

    // //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Conversions to Double
    // //////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    public fun tobps(): Double = value

    public fun toKibps(): Double = value / 1024

    public fun toKbps(): Double = value / 1e3

    public fun toKiBps(): Double = toKibps() / 8

    public fun toKBps(): Double = toKbps() / 8

    public fun toMibps(): Double = toKibps() / 1024

    public fun toMbps(): Double = toKbps() / 1e3

    public fun toMiBps(): Double = toMibps() / 8

    public fun toMBps(): Double = toMbps() / 8

    public fun toGibps(): Double = toMibps() / 1024

    public fun toGbps(): Double = toMbps() / 1e3

    public fun toGiBps(): Double = toGibps() / 8

    public fun toGBps(): Double = toGbps() / 8

    // //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Operation Override (to avoid boxing of value classes in byte code)
    // //////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    public override fun ifNeg0ThenPos0(): DataRate = DataRate(value.ifNeg0thenPos0())

    public override operator fun plus(other: DataRate): DataRate = DataRate(value + other.value)

    public override operator fun minus(other: DataRate): DataRate = DataRate(value - other.value)

    public override operator fun div(scalar: Number): DataRate = DataRate(value / scalar.toDouble())

    public override operator fun div(other: DataRate): Percentage = Percentage.ofRatio(value / other.value)

    public override operator fun times(scalar: Number): DataRate = DataRate(value * scalar.toDouble())

    public override operator fun times(percentage: Percentage): DataRate = DataRate(value * percentage.value)

    public override operator fun unaryMinus(): DataRate = DataRate(-value)

    public override operator fun compareTo(other: DataRate): Int = this.value.compareTo(other.value)

    public override fun isZero(): Boolean = value == .0

    public override fun approxZero(epsilon: Double): Boolean = value.approx(.0, epsilon = epsilon)

    public override fun approx(
        other: DataRate,
        minEpsilon: Double,
        epsilon: Double,
    ): Boolean = this == other || this.value.approx(other.value, minEpsilon, epsilon)

    public override infix fun approx(other: DataRate): Boolean = approx(other, minEpsilon = DFLT_MIN_EPS)

    public override fun approxLarger(
        other: DataRate,
        minEpsilon: Double,
        epsilon: Double,
    ): Boolean = this.value.approxLarger(other.value, minEpsilon, epsilon)

    public override infix fun approxLarger(other: DataRate): Boolean = approxLarger(other, minEpsilon = DFLT_MIN_EPS)

    public override fun approxLargerOrEq(
        other: DataRate,
        minEpsilon: Double,
        epsilon: Double,
    ): Boolean = this.value.approxLargerOrEq(other.value, minEpsilon, epsilon)

    public override infix fun approxLargerOrEq(other: DataRate): Boolean = approxLargerOrEq(other, minEpsilon = DFLT_MIN_EPS)

    public override fun approxSmaller(
        other: DataRate,
        minEpsilon: Double,
        epsilon: Double,
    ): Boolean = this.value.approxSmaller(other.value, minEpsilon, epsilon)

    public override infix fun approxSmaller(other: DataRate): Boolean = approxSmaller(other, minEpsilon = DFLT_MIN_EPS)

    public override fun approxSmallerOrEq(
        other: DataRate,
        minEpsilon: Double,
        epsilon: Double,
    ): Boolean = this.value.approxSmallerOrEq(other.value, minEpsilon, epsilon)

    public override infix fun approxSmallerOrEq(other: DataRate): Boolean = approxSmallerOrEq(other, minEpsilon = DFLT_MIN_EPS)

    public override infix fun max(other: DataRate): DataRate = if (this.value > other.value) this else other

    public override infix fun min(other: DataRate): DataRate = if (this.value < other.value) this else other

    public override fun abs(): DataRate = DataRate(kotlin.math.abs(value))

    public override fun roundToIfWithinEpsilon(
        to: DataRate,
        epsilon: Double,
    ): DataRate =
        if (this.value in (to.value - epsilon)..(to.value + epsilon)) {
            to
        } else {
            this
        }

    public fun max(
        a: DataRate,
        b: DataRate,
    ): DataRate = if (a.value > b.value) a else b

    public fun min(
        a: DataRate,
        b: DataRate,
    ): DataRate = if (a.value < b.value) a else b

    // //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Unit Specific Operations
    // //////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    public operator fun times(timeDelta: TimeDelta): DataSize = DataSize.ofKiB(toKiBps() * timeDelta.toSec())

    public operator fun times(duration: Duration): DataSize = this * duration.toTimeDelta()

    // //////////////////////////////////////////////////////////////////////////////////////////////////////////////////
    // Companion
    // //////////////////////////////////////////////////////////////////////////////////////////////////////////////////

    public companion object : UnitId<DataRate> {
        @JvmStatic override val zero: DataRate = DataRate(.0)

        @JvmStatic override val max: DataRate = DataRate(Double.MAX_VALUE)

        @JvmStatic override val min: DataRate = DataRate(Double.MIN_VALUE)

        public operator fun Number.times(unit: DataRate): DataRate = unit * this

        @JvmStatic
        @JvmName("ofbps")
        public fun ofbps(bps: Number): DataRate = DataRate(bps.toDouble())

        @JvmStatic
        @JvmName("ofBps")
        public fun ofBps(Bps: Number): DataRate = ofbps(Bps.toDouble() * 8)

        @JvmStatic
        @JvmName("ofKibps")
        public fun ofKibps(kibps: Number): DataRate = ofbps(kibps.toDouble() * 1024)

        @JvmStatic
        @JvmName("ofKbps")
        public fun ofKbps(kbps: Number): DataRate = ofbps(kbps.toDouble() * 1e3)

        @JvmStatic
        @JvmName("ofKiBps")
        public fun ofKiBps(kiBps: Number): DataRate = ofKibps(kiBps.toDouble() * 8)

        @JvmStatic
        @JvmName("ofKBps")
        public fun ofKBps(kBps: Number): DataRate = ofKbps(kBps.toDouble() * 8)

        @JvmStatic
        @JvmName("ofMibps")
        public fun ofMibps(mibps: Number): DataRate = ofKibps(mibps.toDouble() * 1024)

        @JvmStatic
        @JvmName("ofMbps")
        public fun ofMbps(mbps: Number): DataRate = ofKbps(mbps.toDouble() * 1e3)

        @JvmStatic
        @JvmName("ofMiBps")
        public fun ofMiBps(miBps: Number): DataRate = ofMibps(miBps.toDouble() * 8)

        @JvmStatic
        @JvmName("ofMBps")
        public fun ofMBps(mBps: Number): DataRate = ofMbps(mBps.toDouble() * 8)

        @JvmStatic
        @JvmName("ofGibps")
        public fun ofGibps(gibps: Number): DataRate = ofMibps(gibps.toDouble() * 1024)

        @JvmStatic
        @JvmName("ofGbps")
        public fun ofGbps(gbps: Number): DataRate = ofMbps(gbps.toDouble() * 1e3)

        @JvmStatic
        @JvmName("ofGiBps")
        public fun ofGiBps(giBps: Number): DataRate = ofGibps(giBps.toDouble() * 8)

        @JvmStatic
        @JvmName("ofGBps")
        public fun ofGBps(gBps: Number): DataRate = ofGbps(gBps.toDouble() * 8)

        // //////////////////////////////////////////////////////////////////////////////////////////////////////////////
        // Serializer
        // //////////////////////////////////////////////////////////////////////////////////////////////////////////////

        /**
         * Serializer for [DataRate] value class. It needs to be a compile
         * time constant to be used as serializer automatically,
         * hence `object :` instead of class instantiation.
         *
         * ```json
         * // e.g.
         * "data-rate": "1 Gbps"
         * "data-rate": "10KBps"
         * "data-rate": "   0.3    GBps  "
         * // etc.
         * ```
         */
        internal object DataRateSerializer : UnitSerializer<DataRate>(
            ifNumber = {
                LOG.warn(
                    "deserialization of number with no unit of measure, assuming it is in Kibps." +
                        "Keep in mind that you can also specify the value as '$it Kibps'",
                )
                ofKibps(it.toDouble())
            },
            serializerFun = { this.encodeString(it.toString()) },
            ifMatches("$NUM_GROUP$BITS$PER$SEC") { ofbps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$BYTES$PER$SEC") { ofBps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$KIBI$BITS$PER$SEC") { ofKibps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$KILO$BITS$PER$SEC") { ofKbps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$KIBI$BYTES$PER$SEC") { ofKiBps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$KILO$BYTES$PER$SEC") { ofKBps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$MEBI$BITS$PER$SEC") { ofMibps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$MEGA$BITS$PER$SEC") { ofMbps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$MEBI$BYTES$PER$SEC") { ofMiBps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$MEGA$BYTES$PER$SEC") { ofMBps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$GIBI$BITS$PER$SEC") { ofGibps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$GIGA$BITS$PER$SEC") { ofGbps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$GIBI$BYTES$PER$SEC") { ofGiBps(json.decNumFromStr(groupValues[1])) },
            ifMatches("$NUM_GROUP$GIGA$BYTES$PER$SEC") { ofGBps(json.decNumFromStr(groupValues[1])) },
        )
    }
}