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package com.itangcent.intellij.jvm.scala

import scala.Option
import scala.util.Either
import java.util.*

@Suppress("UNCHECKED_CAST")
fun  Any?.getOrNull(): T? {
    try {
        when {
            this == null -> return null
            this is Option<*> -> return if (this.isDefined) {
                return this.get() as? T
            } else null
            this is Optional<*> -> return if (this.isPresent) {
                return this.get() as? T
            } else null
            this is Either<*, *> -> return if (this.isRight) {
                return this.right().get() as? T
            } else null
            else -> return this as? T?
        }

    } catch (e: Throwable) {
        return null
    }
}

fun Any.castToList(): List {
    (this as? scala.collection.Iterable<*>)?.toKtList()?.filterNotNull()?.let { return it }
    (this as? scala.collection.Iterator<*>)?.toKtList()?.filterNotNull()?.let { return it }
    (this as? Iterator<*>)?.toList()?.filterNotNull()?.let { return it }
    (this as? Iterable<*>)?.toList()?.filterNotNull()?.let { return it }
    return emptyList()
}

@Suppress("UNCHECKED_CAST")
fun  Any.castToTypedList(): List {
    (this as? scala.collection.Iterable)?.toKtList()?.filterNotNull()?.let { return it }
    (this as? scala.collection.Iterator)?.toKtList()?.let { return it }
    (this as? Iterator)?.toList()?.filterNotNull()?.let { return it }
    (this as? Iterable)?.toList()?.filterNotNull()?.let { return it }
    return emptyList()
}

private fun  Iterator.toList(): List {
    val result = LinkedList()
    this.forEach { result.add(it) }
    return result
}

fun  scala.collection.Iterable.toKtList(): List {
    val result = LinkedList()
    for (r in this) {
        result.add(r)
    }
    return result
}

fun  scala.collection.Iterator.toKtList(): List {
    val result = LinkedList()
    this.forall { result.add(it) }
    return result
}