package ru.dbotthepony.kstarbound.player

import com.google.gson.JsonArray
import com.google.gson.JsonElement
import com.google.gson.JsonObject
import it.unimi.dsi.fastutil.objects.Object2ObjectOpenHashMap
import org.apache.logging.log4j.LogManager
import ru.dbotthepony.kstarbound.defs.quest.QuestTemplate
import ru.dbotthepony.kstarbound.lua.LuaState
import ru.dbotthepony.kstarbound.lua.MessageHandler
import ru.dbotthepony.kstarbound.lua.exposeConfig
import ru.dbotthepony.kstarbound.util.ItemDescriptor
import ru.dbotthepony.kstarbound.util.set
import java.util.UUID

class QuestInstance(
	val avatar: Avatar,
	val descriptor: QuestDescriptor,
	val seed: Long = System.nanoTime().rotateLeft(27).xor(System.currentTimeMillis()),
	val serverID: UUID? = null,
	val worldID: String? = null
) {
	val template: QuestTemplate = avatar.starbound.questTemplates[descriptor.templateId]?.value ?: throw IllegalArgumentException("No such quest template ${descriptor.templateId}")
	val id get() = descriptor.questId

	val lua = LuaState()
	val messages = MessageHandler(lua)

	enum class State(val serializedName: String) {
		NEW("New"),
		OFFER("Offer"),
		ACTIVE("Active"),
		COMPLETE("Complete"),
		FAILED("Failed")
	}

	private val objectiveList = ArrayList<Pair<String, Boolean>>()

	var canTurnIn = false
	var failureText = ""
	var completionText = ""
	var text = ""
	var title = ""
	var state = State.NEW
	var progress: Double? = null
	var compassDirection: Double? = null

	private val portraits = JsonObject()
	private val params = descriptor.parameters.deepCopy()

	private val portraitTitles = Object2ObjectOpenHashMap<String, String>()

	private var isInitialized = false
	private var successfulInit = false
	private var calledStart = false
	private var successfulStart = false

	private val rewards = ArrayList<ItemDescriptor>()

	fun complete() {

	}

	fun fail() {

	}

	private fun setObjectiveList(value: JsonArray) {

	}

	private fun addReward(value: JsonElement) {
		val item = avatar.starbound.item(value)

		if (!item.isEmpty) {
			rewards.add(item)
		}
	}

	init {
		lua.pushTable()
		lua.storeGlobal("self")
		lua.pushTable()
		lua.storeGlobal("storage")

		lua.pushTable()
		lua.storeGlobal("quest")
		lua.loadGlobal("quest")

		lua.setTableClosure("setParameter", this)  { setParameter(it) }

		lua.setTableFunction("parameters", this)  {
			it.lua.push(params)
			1
		}

		lua.setTableClosure("setPortrait", this) { setPortrait(it) }
		lua.setTableClosure("setPortraitTitle", this) { setPortraitTitle(it) }

		lua.setTableFunction("state", this) { it.lua.push(state.serializedName); 1 }
		lua.setTableClosure("complete", this) { complete() }
		lua.setTableClosure("fail", this) { fail() }
		lua.setTableClosure("setCanTurnIn", this) { canTurnIn = it.getBool() }
		lua.setTableFunction("questDescriptor", this) { it.lua.push(avatar.starbound.gson.toJsonTree(descriptor)); 1 }
		lua.setTableFunction("questId", this) { it.lua.push(id); 1 }
		lua.setTableFunction("templateId", this) { it.lua.push(template.id); 1 }
		lua.setTableFunction("seed", this) { it.lua.push(seed); 1 }
		lua.setTableFunction("questArcDescriptor", this) { TODO(); 1 }
		lua.setTableFunction("questArcPosition", this) { TODO(); 1 }
		lua.setTableFunction("worldId", this) { it.lua.push(worldID); 1 }
		lua.setTableFunction("serverUuid", this) { it.lua.push(serverID?.toString()); 1 }
		lua.setTableClosure("setObjectiveList", this) { setObjectiveList(it.getArray()) }
		lua.setTableClosure("setProgress", this) { progress = it.getDoubleOrNil() }
		lua.setTableClosure("setCompassDirection", this) { compassDirection = it.getDoubleOrNil() }
		lua.setTableClosure("setTitle", this) { title = it.getString() }
		lua.setTableClosure("setText", this) { text = it.getString() }
		lua.setTableClosure("setCompletionText", this) { completionText = it.getString() }
		lua.setTableClosure("setFailureText", this) { failureText = it.getString() }
		lua.setTableClosure("addReward", this) { addReward(it.getValue()) }

		lua.pop()

		avatar.starbound.pushLuaAPI(lua)
		avatar.pushLuaAPI(lua)
		lua.exposeConfig(template.scriptConfig)
	}

	private fun setParameter(argStack: LuaState.ArgStack) {
		params.add(argStack.getString(), argStack.getValue())
	}

	private fun setPortrait(argStack: LuaState.ArgStack) {
		val name = argStack.getString()
		val value = argStack.getAnything()

		if (value == null)
			portraits.remove(name)
		else
			portraits.add(name, value)
	}

	private fun setPortraitTitle(argStack: LuaState.ArgStack) {
		val name = argStack.getString()
		val title = argStack.getStringOrNil()

		if (title == null)
			portraitTitles.remove(name)
		else
			portraitTitles[name] = title
	}

	init {
		for ((k, v) in descriptor.parameters.entrySet()) {
			params[k] = v.deepCopy()
		}
	}

	/**
	 * Читает главный скриптовый файл квеста и вызывает его (глобальную) функцию init()
	 */
	fun init(): Boolean {
		if (!isInitialized) {
			isInitialized = true

			val script = avatar.starbound.locate(template.script.fullPath)

			if (!script.isFile) {
				LOGGER.error("Quest ${template.id} specifies ${template.script.fullPath} as its script, but it is not a file or does not exist!")
				return false
			}

			try {
				lua.load(script.readToString(), "@" + template.script.fullPath)
			} catch(err: Throwable) {
				LOGGER.error("Error loading Lua code for quest ${descriptor.questId}", err)
				return false
			}

			try {
				lua.call()
			} catch(err: Throwable) {
				LOGGER.error("Error running Lua code for quest ${descriptor.questId}", err)
				return false
			}

			try {
				lua.loadGlobal("init")
				lua.call()
			} catch(err: Throwable) {
				LOGGER.error("Error running init() function for quest ${descriptor.questId}", err)
				return false
			}

			successfulInit = true
		}

		return successfulInit
	}

	fun start(): Boolean {
		if (!init()) {
			return false
		}

		if (calledStart) {
			return successfulStart
		}

		lua.loadGlobal("questStart")

		try {
			if (lua.isFunction()) {
				lua.call()
			} else {
				lua.pop()
			}
		} catch(err: Throwable) {
			LOGGER.error("Error running questStart() function for quest ${descriptor.questId}", err)
			return false
		}

		return successfulStart
	}

	fun update(delta: Int): Boolean {
		if (!init()) {
			return false
		}

		lua.loadGlobal("update")

		try {
			if (lua.isFunction()) {
				lua.push(delta)
				lua.call(numArgs = 1)
			} else {
				lua.pop()
			}
		} catch(err: Throwable) {
			LOGGER.error("Error running update() function for quest ${descriptor.questId}", err)
			return false
		}

		return true
	}

	companion object {
		private val LOGGER = LogManager.getLogger()
	}
}