KtIrc/src/main/kotlin/com/dmdirc/ktirc/messages/processors/ModeProcessor.kt

package com.dmdirc.ktirc.messages.processors

import com.dmdirc.ktirc.events.ModeChanged
import com.dmdirc.ktirc.messages.RPL_CHANNELMODEIS
import com.dmdirc.ktirc.messages.RPL_UMODEIS
import com.dmdirc.ktirc.model.IrcMessage
import com.dmdirc.ktirc.model.User
import com.dmdirc.ktirc.util.logger

internal class ModeProcessor : MessageProcessor {

    private val log by logger()

    override val commands = arrayOf(RPL_CHANNELMODEIS, RPL_UMODEIS, "MODE")

    override fun process(message: IrcMessage): List<ModeChanged> {
        val isDiscovery = message.command == RPL_CHANNELMODEIS || message.command == RPL_UMODEIS
        val paramOffset = if (message.command == RPL_CHANNELMODEIS) 1 else 0

        if (message.params.size < paramOffset + 2) {
            log.warning { "Discarding MODE line with insufficient parameters: $message" }
            return emptyList()
        }

        return listOf(ModeChanged(
                message.metadata,
                user = message.sourceUser ?: User("*"),
                target = String(message.params[paramOffset]),
                modes = String(message.params[paramOffset + 1]),
                arguments = message.params.takeLast(message.params.size - paramOffset - 2).map { String(it) }.toTypedArray(),
                discovered = isDiscovery))
    }

}