package net.torvald.terrarum.modulebasegame.ui

import com.badlogic.gdx.ApplicationAdapter
import com.badlogic.gdx.Gdx
import com.badlogic.gdx.Input
import com.badlogic.gdx.InputAdapter
import com.badlogic.gdx.graphics.Color
import com.badlogic.gdx.graphics.OrthographicCamera
import com.badlogic.gdx.graphics.Texture
import com.badlogic.gdx.graphics.g2d.SpriteBatch
import com.badlogic.gdx.graphics.g2d.TextureRegion
import net.torvald.btex.BTeXDocViewer
import net.torvald.btex.BTeXParser
import net.torvald.terrarum.*
import net.torvald.terrarum.btex.BTeXDocument
import net.torvald.terrarum.imagefont.TinyAlphNum
import net.torvald.terrarum.langpack.Lang
import net.torvald.terrarum.ui.Toolkit
import net.torvald.terrarum.ui.UICanvas
import net.torvald.unicode.EMDASH
import java.util.concurrent.atomic.AtomicInteger
import java.util.concurrent.atomic.AtomicReference
import kotlin.system.measureTimeMillis

/**
 * Created by minjaesong on 2024-05-22.
 */
class UIProxyBTeXTest(val remoCon: UIRemoCon) : UICanvas() {
    override var width: Int = 0
    override var height: Int = 0
    override var openCloseTime: Second = 0f

    override fun updateImpl(delta: Float) {
    }

    override fun renderImpl(frameDelta: Float, batch: SpriteBatch, camera: OrthographicCamera) {
    }

    override fun doOpening(delta: Float) {
    }

    override fun doClosing(delta: Float) {
    }

    override fun endOpening(delta: Float) {
        val ingame = BTeXTest(App.batch)

        Terrarum.setCurrentIngameInstance(ingame)
        SanicLoadScreen.screenToLoad = ingame
        App.setLoadScreen(SanicLoadScreen)
    }

    override fun endClosing(delta: Float) {
    }

    override fun dispose() {
    }
}


/**
 * Created by minjaesong on 2023-10-28.
 */
class BTeXTest(batch: FlippingSpriteBatch) : IngameInstance(batch) {

    //    val filePath = "btex.xml"
//    val filePath = "btex_ko.xml"
    val filePath = "test.xml"
//    val filePath = "literature/en/daniel_defoe_robinson_crusoe.xml"
//    val filePath = "literature/ruRU/anton_chekhov_palata_no_6.xml"
//    val filePath = "literature/koKR/yisang_nalgae.xml"
//    val filePath = "literature/koKR/yisang_geonchukmuhanyukmyeongakche.xml"


    private lateinit var document: BTeXDocument
    private lateinit var documentHandler: BTeXParser.BTeXHandler

    private lateinit var bg: TextureRegion

    private val varMap = hashMapOf(
        "terrarumver" to "Alpha 1.3",
        "bucks" to "121687"
    )

    private val errorInfo = AtomicReference<Throwable?>().also {
        it.set(null)
    }

    private val typesetProgress = AtomicInteger(0)
    private val renderProgress = AtomicInteger(0)

    override fun preRender() {
        Lang
        TinyAlphNum
        Toolkit
        BTeXParser.BTeXHandler.preloadFonts()

        bg = TextureRegion(Texture(Gdx.files.internal("test_assets/real_bg_with_guides.png")))

        val isBookFinalised = filePath.endsWith(".btxbook")

        if (!isBookFinalised) {
            Thread {
                try {
                    measureTimeMillis {
                        val f = BTeXParser.invoke(AssetCache.getFileHandle("mods/basegame/books/$filePath"), varMap, typesetProgress)
                        document = f.first
                        documentHandler = f.second
                    }.also {
                        println("Time spent on typesetting [ms]: $it")
                    }

                    measureTimeMillis {
                        document.finalise(renderProgress, true)
                    }.also {
                        println("Time spent on finalising [ms]: $it")
                    }

                    /*measureTimeMillis {
                    document.serialise(File("./assets/mods/basegame/books/${filePath.replace(".xml", ".btxbook")}"))
                    }.also {
                        println("Time spent on serialisation [ms]: $it")
                    }*/
                }
                catch (e: Throwable) {
                    errorInfo.set(e)
                    e.printStackTrace()
                }
            }.start()
        }
        else {
            measureTimeMillis {
                document = BTeXDocument.fromFile(AssetCache.getFileHandle("mods/basegame/books/$filePath"))
            }.also {
                println("Time spent on loading [ms]: $it")
            }
        }


        Gdx.input.inputProcessor = object : InputAdapter() {
            override fun touchDown(screenX: Int, screenY: Int, pointer: Int, button: Int): Boolean {
                if (::viewer.isInitialized)
                    viewer.touchDown(screenX, screenY, pointer, button)
                return true
            }

            override fun touchUp(screenX: Int, screenY: Int, pointer: Int, button: Int): Boolean {
                if (::viewer.isInitialized)
                    viewer.touchUp(screenX, screenY, pointer, button)
                return true
            }
        }
    }

    var init = false
    private lateinit var viewer: BTeXDocViewer

    private val drawY = 24

    private fun drawLoadingMsg(batch: SpriteBatch, stage: String) {
        val e = errorInfo.get()
        if (e != null) {
            val st = e.message!!.split('\n').let {
                val idx = it.indexOfFirst { it.startsWith("Caused by: ") }
                it.subList(idx, it.size)
            }
            val th = 14 * st.size
            val tw = st.maxOf { it.length } * 7

            val tx = (App.scr.width - tw) / 2
            val ty = (App.scr.height - th) / 2

            batch.color = Color.CORAL
            st.forEachIndexed { i, s ->
                TinyAlphNum.draw(batch, s, tx.toFloat(), ty + 14f*i)
            }
        }
        else {
            batch.color = Color.WHITE
            Toolkit.drawTextCentered(batch, TinyAlphNum, stage, App.scr.width, 0, App.scr.halfh - 8)

            if (stage.lowercase().startsWith("typesetting")) {
                val pgCnt = typesetProgress.get()
                Toolkit.drawTextCentered(batch, TinyAlphNum, "Pages: $pgCnt", App.scr.width, 0, App.scr.halfh + 15)
            }
            else if (stage.lowercase().startsWith("rendering")) {
                val pgCnt = document.pages.size
                val renderCnt = renderProgress.get()
                Toolkit.drawTextCentered(batch, TinyAlphNum, "Pages: $renderCnt/$pgCnt", App.scr.width, 0, App.scr.halfh + 15)
            }
        }
    }

    override fun renderImpl(updateRate: Float) {
        Gdx.graphics.setTitle("BTeXTest $EMDASH F: ${Gdx.graphics.framesPerSecond}")

        gdxClearAndEnableBlend(.063f, .070f, .086f, 1f)


        if (::document.isInitialized) {
            if (!init) {
                init = true
                viewer = BTeXDocViewer(document)
            }
            else {
                if (document.isFinalised || document.fromArchive) {
                    batch.inUse {
                        batch.draw(bg, 0f, 0f)
                        viewer.render(batch, App.scr.halfwf, drawY.toFloat())

                        batch.color = Color.WHITE
                        val pageText = "${viewer.currentPageStr()}/${viewer.pageCount}"
                        Toolkit.drawTextCentered(
                            batch, TinyAlphNum, pageText,
                            App.scr.width, 0, drawY + document.pageDimensionHeight + 12
                        )
                    }
                }
                else {
                    batch.inUse {
                        drawLoadingMsg(batch, "Rendering...")
                    }
                }

                // control
                if (Gdx.input.isKeyJustPressed(Input.Keys.LEFT))
                    viewer.prevPage()
                else if (Gdx.input.isKeyJustPressed(Input.Keys.RIGHT))
                    viewer.nextPage()
                else if (Gdx.input.isKeyJustPressed(Input.Keys.PAGE_UP))
                    viewer.gotoFirstPage()
                else if (Gdx.input.isKeyJustPressed(Input.Keys.PAGE_DOWN))
                    viewer.gotoLastPage()
            }
        }
        else {
            batch.inUse {
                drawLoadingMsg(batch, "Typesetting...")
            }
        }
    }


}