package club.mcscrims.speedhg.game

import club.mcscrims.speedhg.SpeedHG
import club.mcscrims.speedhg.util.sendMsg
import club.mcscrims.speedhg.util.trans
import net.kyori.adventure.title.Title
import org.bukkit.*
import org.bukkit.attribute.Attribute
import org.bukkit.entity.Player
import org.bukkit.event.EventHandler
import org.bukkit.event.Listener
import org.bukkit.event.entity.EntityDamageByEntityEvent
import org.bukkit.event.entity.EntityDamageEvent
import org.bukkit.event.entity.PlayerDeathEvent
import org.bukkit.event.player.PlayerQuitEvent
import org.bukkit.inventory.ItemStack
import org.bukkit.potion.PotionEffect
import org.bukkit.potion.PotionEffectType
import org.bukkit.scheduler.BukkitTask
import java.util.*
import kotlin.random.Random

class GameManager(
	private val plugin: SpeedHG
): Listener {

	var currentState: GameState = GameState.LOBBY
		private set

	var timer = 0

	val alivePlayers = mutableSetOf<UUID>()

	private var gameTask: BukkitTask? = null

	// Einstellungen aus Config (gecached für Performance)
	private val minPlayers = plugin.config.getInt("game.min-players", 2)
	private val lobbyTime = plugin.config.getInt("game.lobby-time", 60)
	private val invincibilityTime = plugin.config.getInt("game.invincibility-time", 60)
	private val startBorder = plugin.config.getDouble("game.border-start", 300.0)
	private val endBorder = plugin.config.getDouble("game.border-end", 20.0)
	// Zeit in Sekunden, bis Border komplett klein ist (z.B. 10 Min)
	private val borderShrinkTime = plugin.config.getLong("game.border-shrink-time", 600)

	init {
		plugin.server.pluginManager.registerEvents( this, plugin )

		gameTask = Bukkit.getScheduler().runTaskTimer( plugin, { ->
			gameLoop()
		}, 20L, 20L )
	}

	private fun gameLoop()
	{
		when( currentState )
		{
			GameState.LOBBY ->
			{
				if ( Bukkit.getOnlinePlayers().size >= minPlayers )
				{
					setGameState( GameState.STARTING )
					timer = lobbyTime
				}
			}

			GameState.STARTING ->
			{
				if ( Bukkit.getOnlinePlayers().size < minPlayers )
				{
					setGameState( GameState.LOBBY )
					Bukkit.getOnlinePlayers().forEach { player ->
						player.sendMsg( "game.start-aborted" )
					}
					return
				}

				timer--

				if (timer in listOf( 60, 30, 10, 5, 4, 3, 2, 1 ))
				{
					Bukkit.getOnlinePlayers().forEach { p ->
						p.sendMsg( "timer.lobby", "time" to timer.toString() )
						p.playSound( p.location, Sound.BLOCK_NOTE_BLOCK_HAT, 1f, 1f )
					}
				}

				if ( timer <= 0 )
					startGame()
			}

			GameState.INVINCIBILITY ->
			{
				timer--

				if ( timer <= 0 )
					startFighting()
				else
				{
					Bukkit.getOnlinePlayers().forEach { p ->
						p.sendActionBar(p.trans( "timer.actionbar-invincibility", "time" to timer.toString() ))
					}
				}
			}

			GameState.INGAME ->
			{
				timer++
				updateCompass()
				checkWin()
			}

			GameState.ENDING ->
			{
				timer--

				if ( timer <= 0 )
					Bukkit.shutdown()
			}
		}
	}

	fun setGameState(
		newState: GameState
	) {
		this.currentState = newState
	}

	private fun startGame()
	{
		setGameState( GameState.INVINCIBILITY )
		timer = invincibilityTime

		val world = Bukkit.getWorld( "world" ) ?: return
		world.time = 0
		world.setStorm( false )

		val border = world.worldBorder
		border.center = Location( world, 0.0, 0.0, 0.0 )
		border.size = startBorder
		border.damageBuffer = 0.0
		border.damageAmount = 1.0

		val speedEffect = PotionEffect(
			PotionEffectType.SPEED,
			timer,
			0,
			false,
			false,
			true
		)

		val hasteEffect = PotionEffect(
			PotionEffectType.HASTE,
			timer,
			0,
			false,
			false,
			true
		)

		alivePlayers.clear()
		Bukkit.getOnlinePlayers().forEach { player ->
			alivePlayers.add( player.uniqueId )

			player.gameMode = GameMode.SURVIVAL
			player.health = player.getAttribute( Attribute.GENERIC_MAX_HEALTH )?.value ?: 20.0
			player.foodLevel = 20
			player.inventory.clear()
			player.activePotionEffects.forEach { player.removePotionEffect( it.type ) }
			player.addPotionEffects(listOf( speedEffect, hasteEffect ))

			teleportRandomly( player, world, startBorder / 2 )

			// TODO: Kit Items geben
			// plugin.kitManager.giveKit( player )

			player.inventory.addItem(ItemStack( Material.COMPASS ))
			player.sendMsg( "game.started" )
		}

		Bukkit.getOnlinePlayers().forEach { player ->
			player.sendMsg( "game.invincibility-start" )
		}
	}

	private fun startFighting()
	{
		setGameState( GameState.INGAME )
		timer = 0 // Reset Timer für "Ingame"

		val world = Bukkit.getWorld( "world" ) ?: return
		world.worldBorder.setSize( endBorder, borderShrinkTime )

		plugin.antiRunningManager.resetTimers()

		Bukkit.getOnlinePlayers().forEach { p ->
			p.sendMsg( "game.fighting-started" )
			p.playSound( p.location, Sound.ENTITY_ENDER_DRAGON_GROWL, 1f, 1f )

			p.showTitle(Title.title(
				p.trans( "title.fight-main" ),
				p.trans( "title.fight-sub" )
			))
		}
	}

	fun onPlayerEliminated(
		player: Player,
		killer: Player?
	) {
		if (!alivePlayers.contains( player.uniqueId )) return

		alivePlayers.remove( player.uniqueId )
		player.gameMode = GameMode.SPECTATOR

		player.inventory.contents.filterNotNull().forEach {
			player.world.dropItemNaturally( player.location, it )
		}

		val msgKey = if ( killer != null ) "game.death-killed" else "game.death-pve"
		val killerName = killer?.name ?: "Environment"

		Bukkit.getOnlinePlayers().forEach { p ->
			p.sendMsg( msgKey, "player" to player.name, "killer" to killerName, "left" to alivePlayers.size.toString() )
		}

		checkWin()
	}

	private fun checkWin()
	{
		if ( currentState != GameState.INGAME && currentState != GameState.INVINCIBILITY ) return

		if ( alivePlayers.size <= 1 )
		{
			val winnerUUID = alivePlayers.firstOrNull()
			val winnerName = if ( winnerUUID != null ) Bukkit.getPlayer( winnerUUID )?.name ?: "N/A" else "N/A"
			endGame( winnerName )
		}
	}

	private fun endGame(
		winnerName: String
	) {
		setGameState( GameState.ENDING )
		timer = 15

		Bukkit.getOnlinePlayers().forEach { p ->
			p.showTitle(Title.title(
				p.trans( "title.win-main", "winner" to winnerName ),
				p.trans( "title.win-sub" )
			))
			p.sendMsg( "game.win-chat", "winner" to winnerName )
		}
	}

	// --- Helfer Methoden ---

	private fun teleportRandomly(
		player: Player,
		world: World,
		maxRadius: Double
	) {
		var loc: Location
		var safe = false
		var attempts = 0

		do {
			val x = Random.nextDouble( -maxRadius, maxRadius )
			val z = Random.nextDouble( -maxRadius, maxRadius )
			val y = world.getHighestBlockYAt( x.toInt(), z.toInt() ) + 1.0
			loc = Location( world, x, y, z )

			val block = loc.block.type
			val below = loc.subtract( 0.0, 1.0, 0.0 ).block.type

			if ( below.isSolid && below != Material.LAVA && below != Material.CACTUS && block == Material.AIR )
				safe = true
			attempts++
		} while ( !safe && attempts < 20 )

		player.teleport(loc.add( 0.0, 1.0, 0.0 ))
	}

	private fun updateCompass()
	{
		val players = Bukkit.getOnlinePlayers().filter { alivePlayers.contains( it.uniqueId ) }

		for ( p in players )
		{
			var nearest: Player? = null
			var minDistance = Double.MAX_VALUE

			for ( target in players )
			{
				if ( p == target ) continue

				val dist = p.location.distanceSquared( target.location )
				if ( dist < minDistance )
				{
					minDistance = dist
					nearest = target
				}
			}

			if ( nearest != null )
				p.compassTarget = nearest.location
			else
				p.compassTarget = p.world.spawnLocation
		}
	}

	// --- Event Listener Integration ---

	@EventHandler
	fun onDeath(
		event: PlayerDeathEvent
	) {
		if ( currentState == GameState.INGAME || currentState == GameState.INVINCIBILITY )
		{
			event.deathMessage( null )
			event.drops.clear()

			Bukkit.getScheduler().runTask( plugin ) { ->
				event.entity.spigot().respawn()
			}

			onPlayerEliminated( event.entity, event.entity.killer )
		}
	}

	@EventHandler
	fun onQuit(
		event: PlayerQuitEvent
	) {
		if (alivePlayers.contains( event.player.uniqueId ))
		{
			if ( currentState == GameState.INGAME || currentState == GameState.INVINCIBILITY )
			{
				val lastDamageCause = event.player.lastDamageCause

				if ( lastDamageCause != null && lastDamageCause is EntityDamageByEntityEvent )
				{
					val attacker = lastDamageCause.damager

					if ( attacker is Player )
					{
						onPlayerEliminated( event.player, attacker )
						return
					}
				}

				onPlayerEliminated( event.player, null ) // PVE Tod
			}
			else alivePlayers.remove( event.player.uniqueId )
		}
	}

	@EventHandler
	fun onDamage(
		event: EntityDamageEvent
	) {
		if ( currentState == GameState.INVINCIBILITY && event.entity is Player )
			event.isCancelled = true

		if ( currentState == GameState.LOBBY || currentState == GameState.STARTING || currentState == GameState.ENDING )
			event.isCancelled = true // Nie Schaden in Lobby/Ende
	}

}