package at.hannibal2.skyhanni.config

import at.hannibal2.skyhanni.SkyHanniMod
import at.hannibal2.skyhanni.features.fishing.trophy.TrophyRarity
import at.hannibal2.skyhanni.features.misc.update.UpdateManager
import at.hannibal2.skyhanni.utils.LorenzLogger
import at.hannibal2.skyhanni.utils.LorenzRarity
import at.hannibal2.skyhanni.utils.LorenzVec
import at.hannibal2.skyhanni.utils.NEUInternalName
import at.hannibal2.skyhanni.utils.NEUInternalName.Companion.asInternalName
import at.hannibal2.skyhanni.utils.NEUItems
import com.google.gson.GsonBuilder
import com.google.gson.JsonObject
import com.google.gson.TypeAdapter
import com.google.gson.stream.JsonReader
import com.google.gson.stream.JsonWriter
import io.github.moulberry.moulconfig.observer.PropertyTypeAdapterFactory
import io.github.moulberry.moulconfig.processor.BuiltinMoulConfigGuis
import io.github.moulberry.moulconfig.processor.ConfigProcessorDriver
import io.github.moulberry.moulconfig.processor.MoulConfigProcessor
import net.minecraft.item.ItemStack
import java.io.BufferedReader
import java.io.BufferedWriter
import java.io.File
import java.io.FileInputStream
import java.io.FileOutputStream
import java.io.IOException
import java.io.InputStreamReader
import java.io.OutputStreamWriter
import java.nio.charset.StandardCharsets
import java.nio.file.Files
import java.nio.file.StandardCopyOption
import java.util.UUID
import kotlin.concurrent.fixedRateTimer

class ConfigManager {
    companion object {
        val gson = GsonBuilder().setPrettyPrinting()
            .excludeFieldsWithoutExposeAnnotation()
            .serializeSpecialFloatingPointValues()
            .registerTypeAdapterFactory(PropertyTypeAdapterFactory())
            .registerTypeAdapter(UUID::class.java, object : TypeAdapter<UUID>() {
                override fun write(out: JsonWriter, value: UUID) {
                    out.value(value.toString())
                }

                override fun read(reader: JsonReader): UUID {
                    return UUID.fromString(reader.nextString())
                }
            }.nullSafe())
            .registerTypeAdapter(LorenzVec::class.java, object : TypeAdapter<LorenzVec>() {
                override fun write(out: JsonWriter, value: LorenzVec) {
                    value.run { out.value("$x:$y:$z") }
                }

                override fun read(reader: JsonReader): LorenzVec {
                    val (x, y, z) = reader.nextString().split(":").map { it.toDouble() }
                    return LorenzVec(x, y, z)
                }
            }.nullSafe())
            .registerTypeAdapter(TrophyRarity::class.java, object : TypeAdapter<TrophyRarity>() {
                override fun write(out: JsonWriter, value: TrophyRarity) {
                    value.run { out.value(value.name) }
                }

                override fun read(reader: JsonReader): TrophyRarity {
                    val text = reader.nextString()
                    return TrophyRarity.getByName(text) ?: error("Could not parse TrophyRarity from '$text'")
                }
            }.nullSafe())
            .registerTypeAdapter(ItemStack::class.java, object : TypeAdapter<ItemStack>() {
                override fun write(out: JsonWriter, value: ItemStack) {
                    out.value(NEUItems.saveNBTData(value))
                }

                override fun read(reader: JsonReader): ItemStack {
                    return NEUItems.loadNBTData(reader.nextString())
                }
            }.nullSafe())
            .registerTypeAdapter(NEUInternalName::class.java, object : TypeAdapter<NEUInternalName>() {
                override fun write(out: JsonWriter, value: NEUInternalName) {
                    out.value(value.asString())
                }

                override fun read(reader: JsonReader): NEUInternalName {
                    return reader.nextString().asInternalName()
                }
            }.nullSafe())
            .registerTypeAdapter(LorenzRarity::class.java, object : TypeAdapter<LorenzRarity>() {
                override fun write(out: JsonWriter, value: LorenzRarity) {
                    out.value(value.name)
                }

                override fun read(reader: JsonReader): LorenzRarity {
                    return LorenzRarity.valueOf(reader.nextString())
                }
            }.nullSafe())
            .enableComplexMapKeySerialization()
            .create()
    }

    lateinit var features: Features
    lateinit var sackData: SackData
        private set
    private val logger = LorenzLogger("config_manager")

    var configDirectory = File("config/skyhanni")
    private var configFile: File? = null
    private var sackFile: File? = null
    lateinit var processor: MoulConfigProcessor<Features>
    private var disableSaving = false

    fun firstLoad() {
        if (::features.isInitialized) {
            logger.log("Loading config despite config being already loaded?")
        }
        configDirectory.mkdir()

        configFile = File(configDirectory, "config.json")
        sackFile = File(configDirectory, "sacks.json")

        logger.log("Trying to load config from $configFile")

        if (configFile!!.exists()) {
            try {
                val inputStreamReader = InputStreamReader(FileInputStream(configFile!!), StandardCharsets.UTF_8)
                val bufferedReader = BufferedReader(inputStreamReader)

                logger.log("load-config-now")
                val jsonObject = gson.fromJson(bufferedReader.readText(), JsonObject::class.java)
                val newJsonObject = ConfigUpdaterMigrator.fixConfig(jsonObject)
                features = gson.fromJson(
                    newJsonObject,
                    Features::class.java
                )
                logger.log("Loaded config from file")
            } catch (error: Exception) {
                error.printStackTrace()
                val backupFile = configFile!!.resolveSibling("config-${System.currentTimeMillis()}-backup.json")
                logger.log("Exception while reading $configFile. Will load blank config and save backup to $backupFile")
                logger.log("Exception was $error")
                try {
                    configFile!!.copyTo(backupFile)
                } catch (e: Exception) {
                    logger.log("Could not create backup for config file")
                    e.printStackTrace()
                }
            }
        }

        if (sackFile!!.exists()) {
            try {
                val inputStreamReader = InputStreamReader(FileInputStream(sackFile!!), StandardCharsets.UTF_8)
                val bufferedReader = BufferedReader(inputStreamReader)

                logger.log("load-sacks-now")
                sackData = gson.fromJson(
                    bufferedReader.readText(),
                    SackData::class.java
                )
                logger.log("Loaded sacks from file")
            } catch (error: Exception) {
                error.printStackTrace()
            }
        }

        if (!::features.isInitialized) {
            logger.log("Creating blank config and saving to file")
            features = Features()
            saveConfig("blank config")
        }

        fixedRateTimer(name = "skyhanni-config-auto-save", period = 60_000L, initialDelay = 60_000L) {
            saveConfig("auto-save-60s")
        }

        if (!::sackData.isInitialized) {
            logger.log("Creating blank sack data and saving")
            sackData = SackData()
            saveSackData("blank config")
        }

        val features = SkyHanniMod.feature
        processor = MoulConfigProcessor(SkyHanniMod.feature)
        BuiltinMoulConfigGuis.addProcessors(processor)
        UpdateManager.injectConfigProcessor(processor)
        ConfigProcessorDriver.processConfig(
            features.javaClass,
            features,
            processor
        )
    }

    fun saveConfig(reason: String) {
        if (disableSaving) return
        logger.log("saveConfig: $reason")
        val file = configFile ?: throw Error("Can not save config, configFile is null!")
        try {
            logger.log("Saving config file")
            file.parentFile.mkdirs()
            val unit = file.parentFile.resolve("config.json.write")
            unit.createNewFile()
            BufferedWriter(OutputStreamWriter(FileOutputStream(unit), StandardCharsets.UTF_8)).use { writer ->
                // TODO remove old "hidden" area
                writer.write(gson.toJson(SkyHanniMod.feature))
            }
            // Perform move — which is atomic, unlike writing — after writing is done.
            Files.move(
                unit.toPath(),
                file.toPath(),
                StandardCopyOption.REPLACE_EXISTING,
                StandardCopyOption.ATOMIC_MOVE
            )
        } catch (e: IOException) {
            logger.log("Could not save config file to $file")
            e.printStackTrace()
        }
    }

    fun saveSackData(reason: String) {
        if (disableSaving) return
        logger.log("saveSackData: $reason")
        val file = sackFile ?: throw Error("Can not save sacks, sackFile is null!")
        try {
            logger.log("Saving sack file")
            file.parentFile.mkdirs()
            file.createNewFile()
            BufferedWriter(OutputStreamWriter(FileOutputStream(file), StandardCharsets.UTF_8)).use { writer ->
                writer.write(gson.toJson(SkyHanniMod.sackData))
            }
        } catch (e: IOException) {
            logger.log("Could not save sacks file to $file")
            e.printStackTrace()
        }
    }

    fun disableSaving() {
        disableSaving = true
    }
}