package com.shr4pnel.ferretirc.net.messages

import io.ktor.network.selector.SelectorManager
import kotlinx.coroutines.Dispatchers

/**
 * IRC Messages sent by the client
 */
sealed class ClientMessage(val strName: String) {
    abstract fun toWireIntermediate(): String
    fun toWire() = "${toWireIntermediate()}\r\n".encodeToByteArray()

    companion object Util {
        val selectorManager = SelectorManager(Dispatchers.IO)
    }

    class Ping(val token: String? = null) : ClientMessage("PING") {
        init {
            require(token?.isNotEmpty() ?: true) {
                "Token to PING should be null or a non-empty string"
            }
        }

        override fun toWireIntermediate() = "$strName ${token.orEmpty()}"
    }

    sealed class Cap : ClientMessage("CAP") {
        val validSubcommands = listOf("LS", "LIST", "REQ", "END")

        override fun toWireIntermediate() = when (this) {
            is LS -> "CAP LS $version"
            is REQ -> TODO()
            is END -> "CAP END"
            is LIST -> TODO()
        }

        class LS(val version: Int = 302) : Cap()
        class LIST : Cap()
        class REQ(val version: Int?) : Cap()
        class END : Cap()
    }

    class Nick(val nickname: String) : ClientMessage("NICK") {
        override fun toWireIntermediate() = "NICK $nickname"

        init {
            require(nickname.length < 10) { "\"$nickname\" exceeds IRCs maximum nickname length of 9" }
            require(!nickname.startsWith(":") && !nickname.startsWith("#")) { "\"$nickname\" may not begin with : or #" } // TODO THIS SHOULD BLACKLIST ALL PREFIXES NAMED IN CHANTYPES PARAMETER
            require(!nickname.contains(" ")) { "$nickname may not contain a space" }
        }
    }

    class User(val username: String, val realName: String) : ClientMessage("USER") {
        // TODO GET USERNAME INITIALISATION CHECK PARAMETERS FROM USERLEN RPL_ISUPPORT
        init {
            require(username.isNotEmpty()) { "Username may not be blank" }
        }

        override fun toWireIntermediate() = "USER $username 0 * :$realName"
    }

    class Pass(val password: String) : ClientMessage("PASS") {
        override fun toWireIntermediate() = "PASS $password"
    }

    class UNIMPLEMENTED() : ClientMessage("") {
        override fun toWireIntermediate() = ""
    }
}