commonMain.ru.casperix.spine.json.CurveSerializer.kt Maven / Gradle / Ivy

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package ru.casperix.spine.json

import casperix.math.vector.float32.Vector2f
import kotlinx.serialization.KSerializer
import kotlinx.serialization.descriptors.SerialDescriptor
import kotlinx.serialization.descriptors.buildClassSerialDescriptor
import kotlinx.serialization.encoding.Decoder
import kotlinx.serialization.encoding.Encoder
import kotlinx.serialization.json.*
import ru.casperix.spine.json.component.BezierCurve
import ru.casperix.spine.json.component.Curve
import ru.casperix.spine.json.component.SteppedCurve
import ru.casperix.spine.json.component.TupleBezierCurve

class CurveSerializer : KSerializer {
    override val descriptor: SerialDescriptor = buildClassSerialDescriptor("Curve")

    override fun deserialize(decoder: Decoder): Curve {
        require(decoder is JsonDecoder)
        when (val element = decoder.decodeJsonElement()) {
            is JsonArray -> {
                val floats = element.jsonArray.map { it.jsonPrimitive.content.toFloat() }
                if (floats.size == 4) {
                    return BezierCurve(Vector2f(floats[0], floats[1]), Vector2f(floats[2], floats[3]))
                } else if (floats.size == 8) {
                    return TupleBezierCurve(
                        BezierCurve(Vector2f(floats[0], floats[1]), Vector2f(floats[2], floats[3])),
                        BezierCurve(Vector2f(floats[4], floats[5]), Vector2f(floats[6], floats[7]))
                    )
                }
                throw Exception("Expected 4 or 8 points. Actual: ${floats.size}")
            }

            is JsonPrimitive -> {
                val content = element.content
                if (content == "stepped") {
                    return SteppedCurve
                } else {
                    throw Exception("Unsupported or invalid format")
                }
            }

            else -> {
                throw Exception("Unsupported or invalid format")
            }
        }
    }

    override fun serialize(encoder: Encoder, value: Curve) {
        TODO("Not yet implemented")
    }

}

//object CurveSerializer : JsonContentPolymorphicSerializer(Curve::class) {
//    override fun selectDeserializer(element: JsonElement) = when {
//        element is JsonArray -> QuadraticCurve(element.map { it.jsonPrimitive.content.toFloat() }).serializer()
//        element is JsonPrimitive -> if (element.content == "stepped") {
//            SteppedCurve.serializer()
//        } else {
//            throw Exception("Unsupported or invalid format")
//        }
//
//        else -> throw Exception("Unsupported or invalid format")
//    }
//}