package org.pupes.mhdrunpathfinder

import kotlinx.serialization.json.Json
import kotlin.math.PI
import kotlin.math.ln
import kotlin.math.tan

val json = Json {
    coerceInputValues = true // Coerce nulls to default values if applicable
    ignoreUnknownKeys = true // Ignore fields in JSON not present in the data class
}
fun longitudeToXNormalized(longitude: Double): Double {
    return (longitude + 180.0) / 360.0
}


fun latitudeToYNormalized(latitude: Double): Double {
    // Clamp latitude to Web Mercator bounds
    val lat = latitude.coerceIn(-85.05112878, 85.05112878)

    // Convert to radians
    val latRad = lat * PI / 180.0

    // Web Mercator projection formula
    val mercatorY = ln(tan(PI / 4.0 + latRad / 2.0))

    // Normalize to 0.0 - 1.0 range
    // The mercator Y range is approximately -PI to PI
    return 0.5 - (mercatorY / (2.0 * PI))
}