package com.chameth.hexbot

import com.dmdirc.ktirc.IrcClient
import com.dmdirc.ktirc.events.IrcEvent
import com.dmdirc.ktirc.events.MessageReceived
import kotlin.contracts.ExperimentalContracts
import kotlin.contracts.contract

@ExperimentalContracts
fun IrcClient.isModuleCommand(ircEvent: IrcEvent, module: String): Boolean {
    contract {
        returns(true) implies (ircEvent is MessageReceived)
    }
    return isBotCommand(ircEvent) && with(ircEvent.message.split(' ')) { this.size > 1 && this[1].toLowerCase() == module.toLowerCase() }
}

@ExperimentalContracts
fun IrcClient.isBotCommand(ircEvent: IrcEvent): Boolean {
    contract {
        returns(true) implies (ircEvent is MessageReceived)
    }
    return ircEvent is MessageReceived && ircEvent.message.isBotCommand(serverState.localNickname)
}

val MessageReceived.moduleCommandArgs
    get() = message.split(' ').drop(2)

private fun String.isBotCommand(nickname: String) =
        startsWith("$nickname ", ignoreCase=true) ||
        startsWith("$nickname: ", ignoreCase=true) ||
        startsWith("$nickname, ", ignoreCase=true)