#include "../../Platform/stdafx.h"
#include "../../Headers/net.minecraft.world.level.newbiome.layer.h"
#include "../../Headers/net.minecraft.world.level.h"
#include "BiomeOverrideLayer.h"

#ifdef __PSVITA__
// AP - this is used to perform fast 64bit divides of known values
#include "../../../Minecraft.Client/Platform/PSVita/PSVitaExtras/libdivide.h"

libdivide::divider<long long> fast_d2(2);
libdivide::divider<long long> fast_d3(3);
libdivide::divider<long long> fast_d4(4);
libdivide::divider<long long> fast_d5(5);
libdivide::divider<long long> fast_d6(6);
libdivide::divider<long long> fast_d7(7);
libdivide::divider<long long> fast_d10(10);
#endif

LayerArray Layer::getDefaultLayers(int64_t seed, LevelType* levelType) {
    // 4J - Some changes moved here from 1.2.3. Temperature & downfall layers
    // are no longer created & returned, and a debug layer is isn't. For
    // reference with regard to future merging, things NOT brought forward from
    // the 1.2.3 version are new layer types that we don't have yet (shores,
    // swamprivers, region hills etc.)
    std::shared_ptr<Layer> islandLayer =
        std::shared_ptr<Layer>(new IslandLayer(1));
    islandLayer = std::shared_ptr<Layer>(new FuzzyZoomLayer(2000, islandLayer));
    islandLayer = std::shared_ptr<Layer>(new AddIslandLayer(1, islandLayer));
    islandLayer = std::shared_ptr<Layer>(new ZoomLayer(2001, islandLayer));
    islandLayer = std::shared_ptr<Layer>(new AddIslandLayer(2, islandLayer));
    islandLayer = std::shared_ptr<Layer>(new AddSnowLayer(2, islandLayer));
    islandLayer = std::shared_ptr<Layer>(new ZoomLayer(2002, islandLayer));
    islandLayer = std::shared_ptr<Layer>(new AddIslandLayer(3, islandLayer));
    islandLayer = std::shared_ptr<Layer>(new ZoomLayer(2003, islandLayer));
    islandLayer = std::shared_ptr<Layer>(new AddIslandLayer(4, islandLayer));
    //	islandLayer = std::shared_ptr<Layer>(new AddMushroomIslandLayer(5,
    // islandLayer));		// 4J - old position of mushroom island layer

    int zoomLevel = 4;
    if (levelType == LevelType::lvl_largeBiomes) {
        zoomLevel = 6;
    }

    std::shared_ptr<Layer> riverLayer = islandLayer;
    riverLayer = ZoomLayer::zoom(1000, riverLayer, 0);
    riverLayer = std::shared_ptr<Layer>(new RiverInitLayer(100, riverLayer));
    riverLayer = ZoomLayer::zoom(1000, riverLayer, zoomLevel + 2);
    riverLayer = std::shared_ptr<Layer>(new RiverLayer(1, riverLayer));
    riverLayer = std::shared_ptr<Layer>(new SmoothLayer(1000, riverLayer));

    std::shared_ptr<Layer> biomeLayer = islandLayer;
    biomeLayer = ZoomLayer::zoom(1000, biomeLayer, 0);
    biomeLayer =
        std::shared_ptr<Layer>(new BiomeInitLayer(200, biomeLayer, levelType));

    biomeLayer = ZoomLayer::zoom(1000, biomeLayer, 2);
    biomeLayer = std::shared_ptr<Layer>(new RegionHillsLayer(1000, biomeLayer));

    for (int i = 0; i < zoomLevel; i++) {
        biomeLayer =
            std::shared_ptr<Layer>(new ZoomLayer(1000 + i, biomeLayer));

        if (i == 0)
            biomeLayer =
                std::shared_ptr<Layer>(new AddIslandLayer(3, biomeLayer));

        if (i == 0) {
            // 4J - moved mushroom islands to here. This skips 3 zooms that the
            // old location of the add was, making them about 1/8 of the
            // original size. Adding them at this scale actually lets us place
            // them near enough other land, if we add them at the same scale as
            // java then they have to be too far out to see for the scale of our
            // maps
            biomeLayer = std::shared_ptr<Layer>(
                new AddMushroomIslandLayer(5, biomeLayer));
        }

        if (i == 1) {
            // 4J - now expand mushroom islands up again. This does a simple
            // region grow to add a new mushroom island element when any of the
            // neighbours are also mushroom islands. This helps make the islands
            // into nice compact shapes of the type that are actually likely to
            // be able to make an island out of the sea in a small space. Also
            // helps the shore layer from doing too much damage in shrinking the
            // islands we are making
            biomeLayer = std::shared_ptr<Layer>(
                new GrowMushroomIslandLayer(5, biomeLayer));
            // Note - this reduces the size of mushroom islands by turning their
            // edges into shores. We are doing this at i == 1 rather than i == 0
            // as the original does
            biomeLayer =
                std::shared_ptr<Layer>(new ShoreLayer(1000, biomeLayer));

            biomeLayer =
                std::shared_ptr<Layer>(new SwampRiversLayer(1000, biomeLayer));
        }
    }

    biomeLayer = std::shared_ptr<Layer>(new SmoothLayer(1000, biomeLayer));

    biomeLayer = std::shared_ptr<Layer>(
        new RiverMixerLayer(100, biomeLayer, riverLayer));

#ifndef _CONTENT_PACKAGE
#ifdef _BIOME_OVERRIDE
    if (app.DebugSettingsOn() &&
        app.GetGameSettingsDebugMask(ProfileManager.GetPrimaryPad()) &
            (1L << eDebugSetting_EnableBiomeOverride)) {
        biomeLayer =
            std::shared_ptr<BiomeOverrideLayer>(new BiomeOverrideLayer(1));
    }
#endif
#endif

    std::shared_ptr<Layer> debugLayer = biomeLayer;

    std::shared_ptr<Layer> zoomedLayer =
        std::shared_ptr<Layer>(new VoronoiZoom(10, biomeLayer));

    biomeLayer->init(seed);
    zoomedLayer->init(seed);

    LayerArray result(3);
    result[0] = biomeLayer;
    result[1] = zoomedLayer;
    result[2] = debugLayer;
    return result;
}

Layer::Layer(int64_t seedMixup) {
    parent = nullptr;

    // 4jcraft added casts to prevent signed int overflow
    this->seedMixup = seedMixup;
    this->seedMixup *=
        (uint64_t)this->seedMixup * 6364136223846793005l + 1442695040888963407l;
    this->seedMixup = (uint64_t)this->seedMixup + seedMixup;
    this->seedMixup *=
        (uint64_t)this->seedMixup * 6364136223846793005l + 1442695040888963407l;
    this->seedMixup = (uint64_t)this->seedMixup + seedMixup;
    this->seedMixup *=
        (uint64_t)this->seedMixup * 6364136223846793005l + 1442695040888963407l;
    this->seedMixup = (uint64_t)this->seedMixup + seedMixup;
}

void Layer::init(int64_t seed) {
    this->seed = seed;
    if (parent != NULL) parent->init(seed);
    // 4jcraft added casts to prevent signed int overflow
    this->seed *=
        (uint64_t)this->seed * 6364136223846793005l + 1442695040888963407l;
    this->seed = (uint64_t)this->seed + seedMixup;
    this->seed *=
        (uint64_t)this->seed * 6364136223846793005l + 1442695040888963407l;
    this->seed = (uint64_t)this->seed + seedMixup;
    this->seed *=
        (uint64_t)this->seed * 6364136223846793005l + 1442695040888963407l;
    this->seed = (uint64_t)this->seed + seedMixup;
}

void Layer::initRandom(int64_t x, int64_t y) {
    rval = seed;
    // 4jcraft added casts to prevent signed int overflow
    rval *= (uint64_t)rval * 6364136223846793005l + 1442695040888963407l;
    rval += (uint64_t)x;
    rval *= (uint64_t)rval * 6364136223846793005l + 1442695040888963407l;
    rval += (uint64_t)y;
    rval *= (uint64_t)rval * 6364136223846793005l + 1442695040888963407l;
    rval += (uint64_t)x;
    rval *= (uint64_t)rval * 6364136223846793005l + 1442695040888963407l;
    rval += (uint64_t)y;
}

int Layer::nextRandom(int max) {
#ifdef __PSVITA__
    // AP - 64bit mods are very slow on Vita. Replaced with a divide/mult for
    // general case and a fast divide library for specific numbers todo - this
    // can sometimes yield a different number to the original. There's a strange
    // bug sometimes with Vita where if the line "result = (int) ((rval >> 24) %
    // max);" is done twice in a row 'result' will not be the same. Need to
    // speak to Sony about that Also need to compare level against a different
    // platform using the same seed
    int result;
    long long temp = rval;
    temp >>= 24;
    if (max == 2) {
        result = temp - (temp / fast_d2) * 2;
    } else if (max == 3) {
        result = temp - (temp / fast_d3) * 3;
    } else if (max == 4) {
        result = temp - (temp / fast_d4) * 4;
    } else if (max == 5) {
        result = temp - (temp / fast_d5) * 5;
    } else if (max == 6) {
        result = temp - (temp / fast_d6) * 6;
    } else if (max == 7) {
        result = temp - (temp / fast_d7) * 7;
    } else if (max == 10) {
        result = temp - (temp / fast_d10) * 10;
    } else {
        result = temp - (temp / max) * max;
    }
#else

    int result = (int)((rval >> 24) % max);
#endif

    if (result < 0) result += max;
    // 4jcraft added cast to unsigned
    rval *= (uint64_t)rval * 6364136223846793005l + 1442695040888963407l;
    rval += (uint64_t)seed;
    return result;
}