package com.rhubarb_lip_sync.rhubarb_for_spine

import com.beust.klaxon.*
import javafx.collections.FXCollections.observableSet
import java.nio.charset.StandardCharsets
import java.nio.file.Files
import java.nio.file.Path

class SpineJson(private val filePath: Path) {
    private val fileDirectoryPath: Path = filePath.parent
    private val json: JsonObject
    private val skeleton: JsonObject

    init {
        if (!Files.exists(filePath)) {
            throw EndUserException("File '$filePath' does not exist.")
        }
        try {
            json = Parser.default().parse(filePath.toString()) as JsonObject
        } catch (e: Exception) {
            throw EndUserException("Wrong file format. This is not a valid JSON file.")
        }
        skeleton = json.obj("skeleton") ?: throw EndUserException("JSON file is corrupted.")

        validateProperties()
    }

    private fun validateProperties() {
        imagesDirectoryPath
        audioDirectoryPath
    }

    private val imagesDirectoryPath: Path get() {
        val relativeImagesDirectory = skeleton.string("images")
            ?: throw EndUserException("JSON file is incomplete: Images path is missing."
                + " Make sure to check 'Nonessential data' when exporting.")

        val imagesDirectoryPath = fileDirectoryPath.resolve(relativeImagesDirectory).normalize()
        if (!Files.exists(imagesDirectoryPath)) {
            throw EndUserException("Could not find images directory relative to the JSON file."
                + " Make sure the JSON file is in the same directory as the original Spine file.")
        }

        return imagesDirectoryPath
    }

    val audioDirectoryPath: Path get() {
        val relativeAudioDirectory = skeleton.string("audio")
            ?: throw EndUserException("JSON file is incomplete: Audio path is missing."
            + " Make sure to check 'Nonessential data' when exporting.")

        val audioDirectoryPath = fileDirectoryPath.resolve(relativeAudioDirectory).normalize()
        if (!Files.exists(audioDirectoryPath)) {
            throw EndUserException("Could not find audio directory relative to the JSON file."
                + " Make sure the JSON file is in the same directory as the original Spine file.")
        }

        return audioDirectoryPath
    }

    val frameRate: Double get() {
        return skeleton.double("fps") ?: 30.0
    }

    val slots: List<String> get() {
        val slots = json.array("slots") ?: listOf<JsonObject>()
        return slots.mapNotNull { it.string("name") }
    }

    fun guessMouthSlot(): String? {
        return slots.firstOrNull { it.contains("mouth", ignoreCase = true) }
            ?: slots.firstOrNull()
    }

    data class AudioEvent(val name: String, val relativeAudioFilePath: String, val dialog: String?)

    val audioEvents: List<AudioEvent> get() {
        val events = json.obj("events") ?: JsonObject()
        val result = mutableListOf<AudioEvent>()
        for ((name, value) in events) {
            if (value !is JsonObject) throw EndUserException("Invalid event found.")

            val relativeAudioFilePath = value.string("audio") ?: continue

            val dialog = value.string("string")
            result.add(AudioEvent(name, relativeAudioFilePath, dialog))
        }
        return result
    }

    fun getSlotAttachmentNames(slotName: String): List<String> {
        @Suppress("UNCHECKED_CAST")
        val skins: Collection<JsonObject> = when (val skinsObject = json["skins"]) {
            is JsonObject -> skinsObject.values as Collection<JsonObject>
            is JsonArray<*> -> skinsObject as Collection<JsonObject>
            else -> emptyList()
        }

        // Get attachment names for all skins
        return skins
            .flatMap { skin ->
                skin.obj(slotName)?.keys?.toList()
                    ?: skin.obj("attachments")?.obj(slotName)?.keys?.toList()
                    ?: emptyList<String>()
            }
            .distinct()
    }

    val animationNames = observableSet<String>(
        json.obj("animations")?.map{ it.key }?.toMutableSet() ?: mutableSetOf()
    )

    fun createOrUpdateAnimation(mouthCues: List<MouthCue>, eventName: String, animationName: String,
        mouthSlot: String, mouthNaming: MouthNaming
    ) {
        if (!json.containsKey("animations")) {
            json["animations"] = JsonObject()
        }
        val animations: JsonObject = json.obj("animations")!!

        // Round times to full frames. Always round down.
        // If events coincide, prefer the latest one.
        val keyframes = mutableMapOf<Int, MouthShape>()
        for (mouthCue in mouthCues) {
            val frameNumber = (mouthCue.time * frameRate).toInt()
            keyframes[frameNumber] = mouthCue.mouthShape
        }

        animations[animationName] = JsonObject().apply {
            this["slots"] = JsonObject().apply {
                this[mouthSlot] = JsonObject().apply {
                    this["attachment"] = JsonArray(
                        keyframes
                            .toSortedMap()
                            .map { (frameNumber, mouthShape) ->
                                JsonObject().apply {
                                    this["time"] = frameNumber / frameRate
                                    this["name"] = mouthNaming.getName(mouthShape)
                                }
                            }
                    )
                }
            }
            this["events"] = JsonArray(
                JsonObject().apply {
                    this["time"] = 0.0
                    this["name"] = eventName
                    this["string"] = ""
                }
            )
        }

        animationNames.add(animationName)
    }

    override fun toString(): String {
        return json.toJsonString(prettyPrint = true)
    }

    fun save() {
        Files.write(filePath, listOf(toString()), StandardCharsets.UTF_8)
    }
}