/*
 * Copyright 2023 dorkbox, llc
 *
 * 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
 *
 *     http://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 dorkbox.config

import java.lang.Exception
import kotlin.reflect.KClass
import kotlin.reflect.KMutableProperty
import kotlin.reflect.KProperty
import kotlin.reflect.jvm.jvmErasure

internal data class ConfigProp(val key: String, val parentConf: ConfigProp?, val parentObj: Any, val member: KProperty<Any>, val collectionName: String, val index: Int, val ignore: Boolean) {

    val returnType: KClass<*>
        get() {
            return when (parentObj) {
                is Array<*>          -> {
                    member.returnType.jvmErasure.javaObjectType.componentType.kotlin
                }
                is Collection<*> -> {
                    member.returnType.arguments.first().type!!.jvmErasure
                }
                else         -> {
                    member.returnType.jvmErasure
                }
            }
        }

    var override = false

    /**
     * We explicitly ignore BASE collection/array types.
     *
     * We have them as part of our parsing logic, so that we can properly set collection/array values, but do not want them for
     * "general" logic
     */
    @Synchronized
    fun isSupported(): Boolean {
        return !ignore && member is KMutableProperty<*>
    }

    @Synchronized
    fun get(): Any? {
        return if (parentObj is Array<*>) {
            parentObj[index]
        }
        else if (parentObj is ArrayList<*>) {
            parentObj[index]
        }
        else if (parentObj is AbstractList<*>) {
            parentObj[index]
        }
        else if (parentObj is MutableList<*>) {
            parentObj[index]
        }
        else {
            member.getter.call(parentObj)
        }
    }

    @Suppress("UNCHECKED_CAST")
    @Synchronized
    fun set(value: Any?) {
        if (member is KMutableProperty<*>) {
            if (parentObj is Array<*>) {
                (parentObj as Array<Any?>)[index] = value
            }
            else if (parentObj is ArrayList<*>) {
                (parentObj as ArrayList<Any?>).set(index, value)
            }
            else if (parentObj is MutableList<*>) {
                (parentObj as MutableList<Any?>).set(index, value)
            }
            else {
                member.setter.call(parentObj, value)
            }

            // if the value is manually "set", then we consider it "not overridden"
            override = false
        } else {
            throw Exception("Cannot set the immutable type ${member.returnType.jvmErasure}")
        }
    }

    /**
     * When we are initially parsing the CLI/sys/env info, we use this to specify that it is overridden or not.
     *
     * When we are SAVING the data, we only save the baseline data, meaning that we do not save the overridden values
     */
    fun override(overriddenValue: Any?) {
        val get = get()
        if (get != overriddenValue) {
            set(overriddenValue)
            override = true
        }
    }

    // NOTE: this doesn't compare overridden!!
    override fun equals(other: Any?): Boolean {
        if (other !is ConfigProp) return false

        if (isSupported() != other.isSupported()) return false
        if (ignore != other.ignore) return false
        if (key != other.key) return false
        if (get() != other.get()) return false
        return true
    }
}