Math and Time Utilities

// Trigonometric functions
fun sin(x: Double): Double
fun sin(x: Float): Float
fun cos(x: Double): Double
fun cos(x: Float): Float  
fun tan(x: Double): Double
fun tan(x: Float): Float

// Inverse trigonometric functions
fun asin(x: Double): Double
fun asin(x: Float): Float
fun acos(x: Double): Double
fun acos(x: Float): Float
fun atan(x: Double): Double
fun atan(x: Float): Float
fun atan2(y: Double, x: Double): Double
fun atan2(y: Float, x: Float): Float

// Hyperbolic functions
fun sinh(x: Double): Double
fun sinh(x: Float): Float
fun cosh(x: Double): Double
fun cosh(x: Float): Float
fun tanh(x: Double): Double
fun tanh(x: Float): Float

// Exponential and logarithmic functions
fun exp(x: Double): Double
fun exp(x: Float): Float
fun expm1(x: Double): Double
fun expm1(x: Float): Float
fun log(x: Double): Double
fun log(x: Float): Float
fun log10(x: Double): Double
fun log10(x: Float): Float
fun log2(x: Double): Double
fun log2(x: Float): Float
fun ln(x: Double): Double
fun ln(x: Float): Float
fun ln1p(x: Double): Double
fun ln1p(x: Float): Float

// Power and root functions
fun pow(base: Double, exp: Double): Double
fun pow(base: Float, exp: Float): Float
fun sqrt(x: Double): Double
fun sqrt(x: Float): Float
fun hypot(x: Double, y: Double): Double
fun hypot(x: Float, y: Float): Float

// Rounding and absolute value
fun ceil(x: Double): Double
fun ceil(x: Float): Float
fun floor(x: Double): Double
fun floor(x: Float): Float
fun round(x: Double): Double
fun round(x: Float): Float
fun abs(x: Double): Double
fun abs(x: Float): Float
fun abs(x: Int): Int
fun abs(x: Long): Long

// Min/max functions
fun min(a: Double, b: Double): Double
fun min(a: Float, b: Float): Float
fun min(a: Int, b: Int): Int
fun min(a: Long, b: Long): Long
fun max(a: Double, b: Double): Double
fun max(a: Float, b: Float): Float
fun max(a: Int, b: Int): Int
fun max(a: Long, b: Long): Long

// Sign and truncation
fun sign(x: Double): Double
fun sign(x: Float): Float
fun truncate(x: Double): Double
fun truncate(x: Float): Float

/**
 * Convert Kotlin Instant to JavaScript Date
 */
fun Instant.toJSDate(): Date

/**
 * Convert JavaScript Date to Kotlin Instant  
 */
fun Date.toKotlinInstant(): Instant

/**
 * JavaScript Date object
 */
external class Date {
    constructor()
    constructor(milliseconds: Number)
    constructor(year: Int, month: Int, day: Int = 1, hours: Int = 0, minutes: Int = 0, seconds: Int = 0, ms: Int = 0)
    
    fun getTime(): Double
    fun getFullYear(): Int
    fun getMonth(): Int
    fun getDate(): Int
    fun getHours(): Int
    fun getMinutes(): Int
    fun getSeconds(): Int
    fun getMilliseconds(): Int
    
    fun setTime(time: Double)
    fun setFullYear(year: Int)
    fun setMonth(month: Int)
    fun setDate(date: Int)
    fun setHours(hours: Int)
    fun setMinutes(minutes: Int)
    fun setSeconds(seconds: Int)
    fun setMilliseconds(ms: Int)
    
    fun toISOString(): String
    fun toDateString(): String
    fun toTimeString(): String
    
    companion object {
        fun now(): Double
        fun parse(dateString: String): Double
    }
}

/**
 * Duration units adapted for JavaScript
 */
actual enum class DurationUnit(val scale: Double) {
    NANOSECONDS(1e-6),
    MICROSECONDS(1e-3), 
    MILLISECONDS(1.0),
    SECONDS(1e3),
    MINUTES(6e4),
    HOURS(3.6e6),
    DAYS(8.64e7);
    
    fun toMillis(value: Double): Double
    fun fromMillis(millis: Double): Double
}

/**
 * Convert duration value between units
 */
fun convertDurationUnit(value: Double, sourceUnit: DurationUnit, targetUnit: DurationUnit): Double

import kotlin.time.*
import kotlin.math.*

// Mathematical calculations
val angle = PI / 4
val sinValue = sin(angle) // 0.7071...
val cosValue = cos(angle) // 0.7071...

val logValue = ln(E) // 1.0
val powerValue = pow(2.0, 3.0) // 8.0
val sqrtValue = sqrt(16.0) // 4.0

// Rounding operations
val rounded = round(3.7) // 4.0
val floored = floor(3.7) // 3.0  
val ceiled = ceil(3.2) // 4.0

// Date conversions
val now = Clock.System.now()
val jsDate = now.toJSDate()
console.log("Current time: ${jsDate.toISOString()}")

val jsNow = Date()
val kotlinInstant = jsNow.toKotlinInstant()
console.log("Kotlin instant: $kotlinInstant")

// Duration unit conversions
val seconds = 5.0
val millis = DurationUnit.SECONDS.toMillis(seconds) // 5000.0
val minutes = DurationUnit.MILLISECONDS.fromMillis(millis) / 60000.0 // 0.0833...

// JavaScript Date
external class Date {
    constructor()
    constructor(milliseconds: Number)
    constructor(year: Int, month: Int, day: Int, hours: Int, minutes: Int, seconds: Int, ms: Int)
}

// Duration units
actual enum class DurationUnit {
    NANOSECONDS, MICROSECONDS, MILLISECONDS, SECONDS, MINUTES, HOURS, DAYS
}

// Math constants (from kotlin.math)
const val PI: Double
const val E: Double