/*
 * Decompiled with CFR 0.152.
 * 
 * Could not load the following classes:
 *  com.mojang.logging.LogUtils
 *  org.slf4j.Logger
 */
package net.minecraft.client.renderer.texture;

import com.mojang.blaze3d.platform.NativeImage;
import com.mojang.logging.LogUtils;
import java.io.IOException;
import java.io.InputStream;
import java.io.UncheckedIOException;
import java.net.HttpURLConnection;
import java.net.Proxy;
import java.net.URI;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.Executor;
import net.minecraft.client.renderer.texture.DynamicTexture;
import net.minecraft.client.renderer.texture.TextureManager;
import net.minecraft.core.ClientAsset;
import net.minecraft.resources.Identifier;
import net.minecraft.util.ARGB;
import net.minecraft.util.FileUtil;
import net.minecraft.util.Util;
import org.slf4j.Logger;

public class SkinTextureDownloader {
    private static final Logger LOGGER = LogUtils.getLogger();
    private static final int SKIN_WIDTH = 64;
    private static final int SKIN_HEIGHT = 64;
    private static final int LEGACY_SKIN_HEIGHT = 32;
    private final Proxy proxy;
    private final TextureManager textureManager;
    private final Executor mainThreadExecutor;

    public SkinTextureDownloader(Proxy proxy, TextureManager textureManager, Executor mainThreadExecutor) {
        this.proxy = proxy;
        this.textureManager = textureManager;
        this.mainThreadExecutor = mainThreadExecutor;
    }

    public CompletableFuture<ClientAsset.Texture> downloadAndRegisterSkin(Identifier textureId, Path localCopy, String url, boolean processLegacySkin) {
        ClientAsset.DownloadedTexture texture = new ClientAsset.DownloadedTexture(textureId, url);
        return CompletableFuture.supplyAsync(() -> {
            NativeImage loadedSkin;
            try {
                loadedSkin = this.downloadSkin(localCopy, texture.url());
            }
            catch (IOException e) {
                throw new UncheckedIOException(e);
            }
            return processLegacySkin ? SkinTextureDownloader.processLegacySkin(loadedSkin, texture.url()) : loadedSkin;
        }, Util.nonCriticalIoPool().forName("downloadTexture")).thenCompose(fixedSkin -> this.registerTextureInManager(texture, (NativeImage)fixedSkin));
    }

    /*
     * WARNING - Removed try catching itself - possible behaviour change.
     */
    private NativeImage downloadSkin(Path localCopy, String url) throws IOException {
        if (Files.isRegularFile(localCopy, new LinkOption[0])) {
            LOGGER.debug("Loading HTTP texture from local cache ({})", (Object)localCopy);
            try (InputStream inputStream = Files.newInputStream(localCopy, new OpenOption[0]);){
                NativeImage nativeImage = NativeImage.read(inputStream);
                return nativeImage;
            }
        }
        HttpURLConnection connection = null;
        LOGGER.debug("Downloading HTTP texture from {} to {}", (Object)url, (Object)localCopy);
        URI uri = URI.create(url);
        try {
            connection = (HttpURLConnection)uri.toURL().openConnection(this.proxy);
            connection.setDoInput(true);
            connection.setDoOutput(false);
            connection.connect();
            int responseCode = connection.getResponseCode();
            if (responseCode / 100 != 2) {
                throw new IOException("Failed to open " + String.valueOf(uri) + ", HTTP error code: " + responseCode);
            }
            byte[] imageContents = connection.getInputStream().readAllBytes();
            try {
                FileUtil.createDirectoriesSafe(localCopy.getParent());
                Files.write(localCopy, imageContents, new OpenOption[0]);
            }
            catch (IOException e) {
                LOGGER.warn("Failed to cache texture {} in {}", (Object)url, (Object)localCopy);
            }
            NativeImage nativeImage = NativeImage.read(imageContents);
            return nativeImage;
        }
        finally {
            if (connection != null) {
                connection.disconnect();
            }
        }
    }

    private CompletableFuture<ClientAsset.Texture> registerTextureInManager(ClientAsset.Texture textureId, NativeImage contents) {
        return CompletableFuture.supplyAsync(() -> {
            DynamicTexture texture = new DynamicTexture(textureId.texturePath()::toString, contents);
            this.textureManager.register(textureId.texturePath(), texture);
            return textureId;
        }, this.mainThreadExecutor);
    }

    private static NativeImage processLegacySkin(NativeImage image, String url) {
        boolean isLegacy;
        int height = image.getHeight();
        int width = image.getWidth();
        if (width != 64 || height != 32 && height != 64) {
            image.close();
            throw new IllegalStateException("Discarding incorrectly sized (" + width + "x" + height + ") skin texture from " + url);
        }
        boolean bl = isLegacy = height == 32;
        if (isLegacy) {
            NativeImage newImage = new NativeImage(64, 64, true);
            newImage.copyFrom(image);
            image.close();
            image = newImage;
            image.fillRect(0, 32, 64, 32, 0);
            image.copyRect(4, 16, 16, 32, 4, 4, true, false);
            image.copyRect(8, 16, 16, 32, 4, 4, true, false);
            image.copyRect(0, 20, 24, 32, 4, 12, true, false);
            image.copyRect(4, 20, 16, 32, 4, 12, true, false);
            image.copyRect(8, 20, 8, 32, 4, 12, true, false);
            image.copyRect(12, 20, 16, 32, 4, 12, true, false);
            image.copyRect(44, 16, -8, 32, 4, 4, true, false);
            image.copyRect(48, 16, -8, 32, 4, 4, true, false);
            image.copyRect(40, 20, 0, 32, 4, 12, true, false);
            image.copyRect(44, 20, -8, 32, 4, 12, true, false);
            image.copyRect(48, 20, -16, 32, 4, 12, true, false);
            image.copyRect(52, 20, -8, 32, 4, 12, true, false);
        }
        SkinTextureDownloader.setNoAlpha(image, 0, 0, 32, 16);
        if (isLegacy) {
            SkinTextureDownloader.doNotchTransparencyHack(image, 32, 0, 64, 32);
        }
        SkinTextureDownloader.setNoAlpha(image, 0, 16, 64, 32);
        SkinTextureDownloader.setNoAlpha(image, 16, 48, 48, 64);
        return image;
    }

    private static void doNotchTransparencyHack(NativeImage image, int x0, int y0, int x1, int y1) {
        int y;
        int x;
        for (x = x0; x < x1; ++x) {
            for (y = y0; y < y1; ++y) {
                int pix = image.getPixel(x, y);
                if (ARGB.alpha(pix) >= 128) continue;
                return;
            }
        }
        for (x = x0; x < x1; ++x) {
            for (y = y0; y < y1; ++y) {
                image.setPixel(x, y, image.getPixel(x, y) & 0xFFFFFF);
            }
        }
    }

    private static void setNoAlpha(NativeImage image, int x0, int y0, int x1, int y1) {
        for (int x = x0; x < x1; ++x) {
            for (int y = y0; y < y1; ++y) {
                image.setPixel(x, y, ARGB.opaque(image.getPixel(x, y)));
            }
        }
    }
}