package nl.voidcorp.dbot.commands

import com.github.salomonbrys.kotson.fromJson
import net.dv8tion.jda.core.EmbedBuilder
import net.dv8tion.jda.core.OnlineStatus
import net.dv8tion.jda.core.entities.ChannelType
import net.dv8tion.jda.core.entities.Game
import net.dv8tion.jda.core.entities.Guild
import net.dv8tion.jda.core.events.ReadyEvent
import net.dv8tion.jda.core.events.message.MessageReceivedEvent
import net.dv8tion.jda.core.hooks.ListenerAdapter
import nl.voidcorp.dbot.bot
import nl.voidcorp.dbot.gson
import nl.voidcorp.dbot.log
import nl.voidcorp.dbot.storage.CommandString
import nl.voidcorp.dbot.storage.GuildSettings
import java.io.File
import java.time.LocalDateTime
import java.time.OffsetDateTime
import java.util.concurrent.ScheduledExecutorService
import java.util.concurrent.ScheduledThreadPoolExecutor
import kotlin.math.absoluteValue


val gmap = mutableMapOf<Long, GuildSettings>()

object GSM {
    private val f = File("settings.json")


    fun getSettings(it: Guild): GuildSettings {
        val res = gmap[it.idLong]
        return if (res != null) {
            res
        } else {
            val gm = GuildSettings()
            gmap[it.idLong] = gm
            gm
        }
    }

    fun init() {
        if (f.exists()) {
            try {
                val m = gson.fromJson<Map<Long, GuildSettings>>(f.readText())
                gmap.putAll(m)
            } catch (ex: IllegalStateException) {
            }
        }
    }

    fun shutdown() {
        gson.toJson(gmap, f.bufferedWriter())
    }
}

data class UnityCommandClient(
    private val prefix: String,
    private val commands: MutableList<UnityCommand> = mutableListOf()
) : ListenerAdapter() {

    private val cooldownMap = mutableMapOf<String, LocalDateTime>()

    fun applyCooldown(name: String, seconds: Int) {
        cooldownMap[name] = LocalDateTime.now().plusSeconds(seconds.toLong())
    }

    fun getRemainingCooldown(name: String): Int {
        val cd = cooldownMap[name]
        return if (cd == null) {
            0
        } else {
            (LocalDateTime.now().second - cd.second).absoluteValue
        }
    }

    fun isOnCooldown(name: String): Boolean {
        val cooldown: Boolean? = LocalDateTime.now().isBefore(cooldownMap[name] ?: LocalDateTime.MIN)

        return cooldown ?: false
    }


    fun cleanCooldowns() {
        for ((k, v) in cooldownMap) {
            if (v.isBefore(LocalDateTime.now())) {
                cooldownMap.remove(k)
            }
        }
    }

    fun getError(): String = "❌"


    fun getServerInvite(): String {
        return ""
    }

    private val ses = ScheduledThreadPoolExecutor(8)

    fun getScheduleExecutor(): ScheduledExecutorService = ses


    fun getWarning(): String = "⚠️"

    fun addCommand(command: UnityCommand) {
        commands.add(command)
    }

    fun addCommand(command: UnityCommand, index: Int) {
        commands.add(index, command)
    }

    fun <T : UnityCommand> addCommands(commands: List<T>) {
        for (c in commands) {
            addCommand(c)
        }
    }


    private fun getSettings(guild: Guild): GuildSettings = GSM.getSettings(guild)


    private val start = OffsetDateTime.now()
    fun getStartTime(): OffsetDateTime = start


    fun getSuccess(): String = "✔️"

    private val usageMap = mutableMapOf<String, Int>()


    private operator fun <T> MutableMap<T, Int>.plus(t: T) {
        val res = this[t]
        if (res != null) {
            this[t] = res + 1
        } else {
            this[t] = 1
        }
    }

    fun getCommandUses(name: String): Int = usageMap[name] ?: 0


    fun shutdown() {
        ses.shutdown()
        GSM.shutdown()
    }


    fun usesLinkedDeletion(): Boolean = false

    fun getTextualPrefix(): String = prefix

    fun getTotalGuilds(): Int = bot.guilds.size


    val ownerId = "168743656738521088"
    fun getOwnerIdLong(): Long = ownerId.toLong()

    private fun splitOnPrefixLength(rawContent: String, length: Int): CommandString {
        val m = rawContent.substring(length).trim { it <= ' ' }.split("\\s+".toRegex(), 2)
        val cmds = if (m.size == 2) {
            CommandString(m[0], m[1])
        } else {
            CommandString(m[0])
        }
        return cmds
    }


    var unknownCommandHandler: (MessageReceivedEvent, String?) -> Unit = { event, command ->
        val eb = EmbedBuilder().setTitle("Something went wrong...")
            .addField("Unknown command: `$command`", "I don't know this command...", false)
            .setColor(event.guild.selfMember.color)
            .setFooter("Requested by ${event.member.effectiveName}", event.author.effectiveAvatarUrl)
            .setTimestamp(LocalDateTime.now())
        event.textChannel.sendMessage(eb.build()).queue()
    }

    override fun onMessageReceived(event: MessageReceivedEvent) {
        if (event.author.isBot)
            return

        var commandString: CommandString? = null
        val rawContent = event.message.contentRaw

        val settings = getSettings(event.guild)


        //Check for mention

        if (rawContent.startsWith("<@" + event.jda.selfUser.id + ">") || rawContent.startsWith("<@!" + event.jda.selfUser.id + ">")) {
            commandString = splitOnPrefixLength(rawContent, rawContent.indexOf(">") + 1)
        }


        //check for default prefix if not overridden
        if (rawContent.startsWith(prefix) and settings.prefixes.isEmpty())
            commandString = splitOnPrefixLength(rawContent, prefix.length)

        // Check for guild specific prefixes
        if (commandString == null) {
            val prefixes = settings.getPrefixes()
            for (prefix in prefixes) {
                if (commandString == null && rawContent.toLowerCase().startsWith(prefix.toLowerCase()))
                    commandString = splitOnPrefixLength(rawContent, prefix.length)
            }
        }

        if (commandString != null)
        //starts with valid prefix
        {
            if ((event.channel.type == ChannelType.PRIVATE) or event.textChannel.canTalk()) {
                var command: UnityCommand?// this will be null if it's not a command
                command = commands.firstOrNull { it.name == commandString.command }
                if (command == null) {
                    command = commands.firstOrNull { commandString.command in it.aliases }
                }


                if (command != null) {
                    val cevent = UnityCommandEvent(event, commandString.args, this)

                    /*if (cmdListener != null)
                        cmdListener!!.onCommand(cevent, command)*/
                    usageMap + command.name
                    try {
                        command.run(cevent)
                    } catch (ex: UnknownCommandError) {
                        unknownCommandHandler(event, commandString.command)
                    }

                    return  // Command is done
                } else {
                    unknownCommandHandler(event, commandString.command)
                }
            }
        }

    }

    fun onException(t: Throwable) {
        val channel = bot.getPrivateChannelById("501009066479452170")
        channel.sendMessage("There was an error: ${t.message}").queue()
    }


    private val status = OnlineStatus.ONLINE
    var version = "?.?"
        set(value) {
            game = Game.watching("fraud and \uD83C\uDFB5 (v$value)")

        }

    private var game: Game = Game.watching("fraud and \uD83C\uDFB5 (v$version)")


    override fun onReady(event: ReadyEvent) {

        if (!event.jda.selfUser.isBot) {
            log.error("This bot can't run as a client!")
            return
        }
        event.jda.presence.setPresence(
            status,
            game
        )

        // Start SettingsManager if necessary
        GSM.init()
    }


}