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Code-only GraphQL schema generation for Kotlin

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/*
 * Copyright 2022 Expedia, Inc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.expediagroup.graphql.generator.internal.extensions

import com.expediagroup.graphql.generator.exceptions.CouldNotCastGraphQLSchemaElement
import graphql.schema.GraphQLAppliedDirective
import graphql.schema.GraphQLDirectiveContainer
import graphql.schema.GraphQLFieldDefinition
import graphql.schema.GraphQLNonNull
import graphql.schema.GraphQLSchemaElement
import graphql.schema.GraphQLType
import kotlin.reflect.KType

/**
 * Map null and non-null types.
 * Returns same type when wrapping a non-null graphql type twice.
 */
internal fun GraphQLType.wrapInNonNull(type: KType): GraphQLType = when {
    this is GraphQLNonNull -> this
    type.isMarkedNullable -> this
    else -> GraphQLNonNull.nonNull(this)
}

@Throws(CouldNotCastGraphQLSchemaElement::class)
internal inline fun  GraphQLSchemaElement.safeCast(): T {
    if (this !is T) throw CouldNotCastGraphQLSchemaElement(this, T::class)
    return this
}

internal fun GraphQLDirectiveContainer.getAllAppliedDirectives(): List {
    // A function without directives may still be rewired if the arguments have directives
    // see https://github.com/ExpediaGroup/graphql-kotlin/wiki/Schema-Directives for details
    val mutableList = mutableListOf()
    mutableList.addAll(this.appliedDirectives)

    if (this is GraphQLFieldDefinition) {
        this.arguments.forEach { mutableList.addAll(it.appliedDirectives) }
    }
    return mutableList
}