package org.jetbrains.dokka.links

import java.text.ParseException

/**
 * [DRI] stands for DokkaResourceIdentifier
 */
data class DRI(val packageName: String? = null,
               val classNames: String? = null,
               val callable: Callable? = null,
               val target: Int? = null,
               val extra: String? = null) {

    constructor(packageName: String? = null,
                classNames: String? = null,
                callableName: String? = null,
                signature: String? = null,
                target: Int? = null,
                extra: String? = null) : this(packageName, classNames, Callable.from(callableName, signature), target, extra)

    override fun toString(): String =
        "${packageName.orEmpty()}/${classNames.orEmpty()}/${callable?.name.orEmpty()}/${callable?.signature().orEmpty()}/${target?.toString().orEmpty()}/${extra.orEmpty()}"

    companion object {
        fun from(s: String): DRI = try {
            s.split('/')
                .map { it.takeIf(String::isNotBlank) }
                .let { (packageName, classNames, callableName, callableSignature, target, ext) ->
                    DRI(
                        packageName,
                        classNames,
                        try { Callable.from(callableName, callableSignature) } catch(e: ParseException) { null },
                        target?.toInt(),
                        ext
                    )
                }
        } catch (e: Throwable) {
            throw ParseException(s, 0)
        }
    }
}

data class Callable(val name: String, val receiver: String, val returnType: String, val params: List<String>) {
    fun signature() = "$receiver.$returnType.${params.joinToString(".")}"
    companion object {
        fun from(name: String?, signature: String?): Callable = try {
            signature.toString()
                .split('#', ignoreCase = false, limit = 3)
                .let { (receiver, returnType, params) ->
                    Callable(
                        name.toString(),
                        receiver,
                        returnType,
                        params.split('#')
                    )
                }
        } catch (e: Throwable) {
            throw ParseException(signature, 0)
        }

        fun from(s: String): Callable = try {
            s.split('/').let { (name, signature) -> from(name, signature) }
        } catch (e: Throwable) {
            throw ParseException(s, 0)
        }
    }
}

data class ClassReference(val dri: DRI, val subs: MutableList<ClassReference> = mutableListOf())

private operator fun <T> List<T>.component6(): T = get(5)