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kotlinx.serialization for two and three dimensional geometrical objects.

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package com.bselzer.ktx.serialization.serializer

import com.bselzer.ktx.geometry.dimension.tri.position.Point3D
import kotlinx.serialization.ExperimentalSerializationApi
import kotlinx.serialization.KSerializer
import kotlinx.serialization.builtins.ListSerializer
import kotlinx.serialization.builtins.serializer
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder

/**
 * A serializer for converting an array into a three-dimensional point.
 */
class Point3DSerializer : KSerializer {
    /**
     * The serializer of the 3D point data.
     */
    private val serializer = ListSerializer(Double.serializer())

    @OptIn(ExperimentalSerializationApi::class)
    override val descriptor: SerialDescriptor = SerialDescriptor(Point3D::class.qualifiedName!!, serializer.descriptor)

    override fun deserialize(decoder: Decoder): Point3D = deserialize(serializer.deserialize(decoder))

    /**
     * Converts a list to a [Point3D].
     *
     * @param list the three-dimensional components
     */
    fun deserialize(list: List) = Point3D(list.getOrElse(0) { 0.0 }, list.getOrElse(1) { 0.0 }, list.getOrElse(2) { 0.0 })

    override fun serialize(encoder: Encoder, value: Point3D) {
        val list = listOf(value.x, value.y, value.z)
        serializer.serialize(encoder, list)
    }
}