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The Firebase Kotlin SDK is a Kotlin-first SDK for Firebase. It's API is similar to the Firebase Android SDK Kotlin Extensions but also supports multiplatform projects, enabling you to use Firebase directly from your common source targeting iOS, Android or JS.

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package dev.gitlive.firebase.firestore

import dev.gitlive.firebase.internal.SpecialValueSerializer
import dev.gitlive.firebase.firestore.DoubleAsTimestampSerializer.SERVER_TIMESTAMP
import kotlinx.serialization.KSerializer
import kotlinx.serialization.SerializationException

/** A serializer for [BaseTimestamp]. Must be used with [FirebaseEncoder]/[FirebaseDecoder]. */
public object BaseTimestampSerializer : KSerializer by SpecialValueSerializer(
    serialName = "Timestamp",
    toNativeValue = { value ->
        when (value) {
            Timestamp.ServerTimestamp -> FieldValue.serverTimestamp.nativeValue
            is Timestamp -> value.nativeValue
            else -> throw SerializationException("Cannot serialize $value")
        }
    },
    fromNativeValue = { value ->
        when (value) {
            is NativeTimestamp -> Timestamp(value)
            FieldValue.serverTimestamp.nativeValue -> Timestamp.ServerTimestamp
            else -> throw SerializationException("Cannot deserialize $value")
        }
    },
)

/** A serializer for [Timestamp]. Must be used with [FirebaseEncoder]/[FirebaseDecoder]. */
public object TimestampSerializer : KSerializer by SpecialValueSerializer(
    serialName = "Timestamp",
    toNativeValue = Timestamp::nativeValue,
    fromNativeValue = { value ->
        when (value) {
            is NativeTimestamp -> Timestamp(value)
            else -> throw SerializationException("Cannot deserialize $value")
        }
    },
)

/** A serializer for [Timestamp.ServerTimestamp]. Must be used with [FirebaseEncoder]/[FirebaseDecoder]. */
public object ServerTimestampSerializer : KSerializer by SpecialValueSerializer(
    serialName = "Timestamp",
    toNativeValue = { FieldValue.serverTimestamp.nativeValue },
    fromNativeValue = { value ->
        when (value) {
            FieldValue.serverTimestamp.nativeValue -> Timestamp.ServerTimestamp
            else -> throw SerializationException("Cannot deserialize $value")
        }
    },
)

/** A serializer for a Double field which is stored as a Timestamp. */
public object DoubleAsTimestampSerializer : KSerializer by SpecialValueSerializer(
    serialName = "Timestamp",
    toNativeValue = { value ->
        when (value) {
            SERVER_TIMESTAMP -> FieldValue.serverTimestamp.nativeValue
            else -> Timestamp.fromMilliseconds(value).nativeValue
        }
    },
    fromNativeValue = { value ->
        when (value) {
            FieldValue.serverTimestamp.nativeValue -> SERVER_TIMESTAMP
            is NativeTimestamp -> Timestamp(value).toMilliseconds()
            is Double -> value
            else -> throw SerializationException("Cannot deserialize $value")
        }
    },
) {
    public const val SERVER_TIMESTAMP: Double = Double.POSITIVE_INFINITY
}