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Assisted injection for JSR 330

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package com.squareup.inject.assisted.processor.internal

import com.squareup.javapoet.ClassName
import com.squareup.javapoet.CodeBlock
import com.squareup.javapoet.ParameterizedTypeName
import com.squareup.javapoet.TypeName
import javax.lang.model.element.TypeElement
import javax.lang.model.type.TypeMirror
import kotlin.reflect.KClass

fun TypeElement.toClassName(): ClassName = ClassName.get(this)
fun TypeMirror.toTypeName(): TypeName = TypeName.get(this)
fun KClass<*>.toClassName(): ClassName = ClassName.get(java)

fun Iterable.joinToCode(separator: String = ", ") = CodeBlock.join(this, separator)

/**
 * Like [ClassName.peerClass] except instead of honoring the enclosing class names they are
 * concatenated with `$` similar to the reflection name. `foo.Bar.Baz` invoking this function with
 * `Fuzz` will produce `foo.Baz$Fuzz`.
 */
fun ClassName.peerClassWithReflectionNesting(name: String): ClassName {
  var prefix = ""
  var peek = this
  while (true) {
    peek = peek.enclosingClassName() ?: break
    prefix = peek.simpleName() + "$" + prefix
  }
  return ClassName.get(packageName(), prefix + name)
}

// TODO https://github.com/square/javapoet/issues/671
fun TypeName.rawClassName(): ClassName = when (this) {
  is ClassName -> this
  is ParameterizedTypeName -> rawType
  else -> throw IllegalStateException("Cannot extract raw class name from $this")
}