package com.mojang.realmsclient.gui.screens;

import com.google.common.collect.Lists;
import com.google.common.util.concurrent.RateLimiter;
import com.mojang.logging.LogUtils;
import com.mojang.realmsclient.Unit;
import com.mojang.realmsclient.client.FileDownload;
import com.mojang.realmsclient.dto.WorldDownload;
import it.unimi.dsi.fastutil.booleans.BooleanConsumer;
import java.util.List;
import java.util.Locale;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
import net.fabricmc.api.EnvType;
import net.fabricmc.api.Environment;
import net.minecraft.Util;
import net.minecraft.client.GameNarrator;
import net.minecraft.client.gui.GuiGraphics;
import net.minecraft.client.gui.components.Button;
import net.minecraft.client.gui.screens.Screen;
import net.minecraft.network.chat.CommonComponents;
import net.minecraft.network.chat.Component;
import net.minecraft.realms.RealmsScreen;
import org.jetbrains.annotations.Nullable;
import org.slf4j.Logger;

@Environment(EnvType.CLIENT)
public class RealmsDownloadLatestWorldScreen extends RealmsScreen {
	private static final Logger LOGGER = LogUtils.getLogger();
	private static final ReentrantLock DOWNLOAD_LOCK = new ReentrantLock();
	private static final int BAR_WIDTH = 200;
	private static final int BAR_TOP = 80;
	private static final int BAR_BOTTOM = 95;
	private static final int BAR_BORDER = 1;
	private final Screen lastScreen;
	private final WorldDownload worldDownload;
	private final Component downloadTitle;
	private final RateLimiter narrationRateLimiter;
	private Button cancelButton;
	private final String worldName;
	private final RealmsDownloadLatestWorldScreen.DownloadStatus downloadStatus;
	@Nullable
	private volatile Component errorMessage;
	private volatile Component status = Component.translatable("mco.download.preparing");
	@Nullable
	private volatile String progress;
	private volatile boolean cancelled;
	private volatile boolean showDots = true;
	private volatile boolean finished;
	private volatile boolean extracting;
	@Nullable
	private Long previousWrittenBytes;
	@Nullable
	private Long previousTimeSnapshot;
	private long bytesPersSecond;
	private int animTick;
	private static final String[] DOTS = new String[]{"", ".", ". .", ". . ."};
	private int dotIndex;
	private boolean checked;
	private final BooleanConsumer callback;

	public RealmsDownloadLatestWorldScreen(Screen lastScreen, WorldDownload worldDownload, String worldName, BooleanConsumer callback) {
		super(GameNarrator.NO_TITLE);
		this.callback = callback;
		this.lastScreen = lastScreen;
		this.worldName = worldName;
		this.worldDownload = worldDownload;
		this.downloadStatus = new RealmsDownloadLatestWorldScreen.DownloadStatus();
		this.downloadTitle = Component.translatable("mco.download.title");
		this.narrationRateLimiter = RateLimiter.create(0.1F);
	}

	@Override
	public void init() {
		this.cancelButton = this.addRenderableWidget(
			Button.builder(CommonComponents.GUI_CANCEL, button -> this.onClose()).bounds((this.width - 200) / 2, this.height - 42, 200, 20).build()
		);
		this.checkDownloadSize();
	}

	private void checkDownloadSize() {
		if (!this.finished && !this.checked) {
			this.checked = true;
			if (this.getContentLength(this.worldDownload.downloadLink) >= 5368709120L) {
				Component component = Component.translatable("mco.download.confirmation.oversized", Unit.humanReadable(5368709120L));
				this.minecraft.setScreen(RealmsPopups.warningAcknowledgePopupScreen(this, component, popupScreen -> {
					this.minecraft.setScreen(this);
					this.downloadSave();
				}));
			} else {
				this.downloadSave();
			}
		}
	}

	private long getContentLength(String uri) {
		FileDownload fileDownload = new FileDownload();
		return fileDownload.contentLength(uri);
	}

	@Override
	public void tick() {
		super.tick();
		this.animTick++;
		if (this.status != null && this.narrationRateLimiter.tryAcquire(1)) {
			Component component = this.createProgressNarrationMessage();
			this.minecraft.getNarrator().sayNow(component);
		}
	}

	private Component createProgressNarrationMessage() {
		List<Component> list = Lists.<Component>newArrayList();
		list.add(this.downloadTitle);
		list.add(this.status);
		if (this.progress != null) {
			list.add(Component.translatable("mco.download.percent", this.progress));
			list.add(Component.translatable("mco.download.speed.narration", Unit.humanReadable(this.bytesPersSecond)));
		}

		if (this.errorMessage != null) {
			list.add(this.errorMessage);
		}

		return CommonComponents.joinLines(list);
	}

	@Override
	public void onClose() {
		this.cancelled = true;
		if (this.finished && this.callback != null && this.errorMessage == null) {
			this.callback.accept(true);
		}

		this.minecraft.setScreen(this.lastScreen);
	}

	@Override
	public void render(GuiGraphics guiGraphics, int mouseX, int mouseY, float partialTick) {
		super.render(guiGraphics, mouseX, mouseY, partialTick);
		guiGraphics.drawCenteredString(this.font, this.downloadTitle, this.width / 2, 20, -1);
		guiGraphics.drawCenteredString(this.font, this.status, this.width / 2, 50, -1);
		if (this.showDots) {
			this.drawDots(guiGraphics);
		}

		if (this.downloadStatus.bytesWritten != 0L && !this.cancelled) {
			this.drawProgressBar(guiGraphics);
			this.drawDownloadSpeed(guiGraphics);
		}

		if (this.errorMessage != null) {
			guiGraphics.drawCenteredString(this.font, this.errorMessage, this.width / 2, 110, -65536);
		}
	}

	private void drawDots(GuiGraphics guiGraphics) {
		int i = this.font.width(this.status);
		if (this.animTick != 0 && this.animTick % 10 == 0) {
			this.dotIndex++;
		}

		guiGraphics.drawString(this.font, DOTS[this.dotIndex % DOTS.length], this.width / 2 + i / 2 + 5, 50, -1);
	}

	private void drawProgressBar(GuiGraphics guiGraphics) {
		double d = Math.min((double)this.downloadStatus.bytesWritten / this.downloadStatus.totalBytes, 1.0);
		this.progress = String.format(Locale.ROOT, "%.1f", d * 100.0);
		int i = (this.width - 200) / 2;
		int j = i + (int)Math.round(200.0 * d);
		guiGraphics.fill(i - 1, 79, j + 1, 96, -1);
		guiGraphics.fill(i, 80, j, 95, -8355712);
		guiGraphics.drawCenteredString(this.font, Component.translatable("mco.download.percent", this.progress), this.width / 2, 84, -1);
	}

	private void drawDownloadSpeed(GuiGraphics guiGraphics) {
		if (this.animTick % 20 == 0) {
			if (this.previousWrittenBytes != null) {
				long l = Util.getMillis() - this.previousTimeSnapshot;
				if (l == 0L) {
					l = 1L;
				}

				this.bytesPersSecond = 1000L * (this.downloadStatus.bytesWritten - this.previousWrittenBytes) / l;
				this.drawDownloadSpeed0(guiGraphics, this.bytesPersSecond);
			}

			this.previousWrittenBytes = this.downloadStatus.bytesWritten;
			this.previousTimeSnapshot = Util.getMillis();
		} else {
			this.drawDownloadSpeed0(guiGraphics, this.bytesPersSecond);
		}
	}

	private void drawDownloadSpeed0(GuiGraphics guiGraphics, long bytesPerSecond) {
		if (bytesPerSecond > 0L) {
			int i = this.font.width(this.progress);
			guiGraphics.drawString(this.font, Component.translatable("mco.download.speed", Unit.humanReadable(bytesPerSecond)), this.width / 2 + i / 2 + 15, 84, -1);
		}
	}

	private void downloadSave() {
		new Thread(() -> {
			try {
				try {
					if (!DOWNLOAD_LOCK.tryLock(1L, TimeUnit.SECONDS)) {
						this.status = Component.translatable("mco.download.failed");
						return;
					}

					if (this.cancelled) {
						this.downloadCancelled();
						return;
					}

					this.status = Component.translatable("mco.download.downloading", this.worldName);
					FileDownload fileDownload = new FileDownload();
					fileDownload.contentLength(this.worldDownload.downloadLink);
					fileDownload.download(this.worldDownload, this.worldName, this.downloadStatus, this.minecraft.getLevelSource());

					while (!fileDownload.isFinished()) {
						if (fileDownload.isError()) {
							fileDownload.cancel();
							this.errorMessage = Component.translatable("mco.download.failed");
							this.cancelButton.setMessage(CommonComponents.GUI_DONE);
							return;
						}

						if (fileDownload.isExtracting()) {
							if (!this.extracting) {
								this.status = Component.translatable("mco.download.extracting");
							}

							this.extracting = true;
						}

						if (this.cancelled) {
							fileDownload.cancel();
							this.downloadCancelled();
							return;
						}

						try {
							Thread.sleep(500L);
						} catch (InterruptedException var8) {
							LOGGER.error("Failed to check Realms backup download status");
						}
					}

					this.finished = true;
					this.status = Component.translatable("mco.download.done");
					this.cancelButton.setMessage(CommonComponents.GUI_DONE);
					return;
				} catch (InterruptedException var9) {
					LOGGER.error("Could not acquire upload lock");
				} catch (Exception var10) {
					this.errorMessage = Component.translatable("mco.download.failed");
					LOGGER.info("Exception while downloading world", (Throwable)var10);
				}
			} finally {
				if (!DOWNLOAD_LOCK.isHeldByCurrentThread()) {
					return;
				} else {
					DOWNLOAD_LOCK.unlock();
					this.showDots = false;
					this.finished = true;
				}
			}
		}).start();
	}

	private void downloadCancelled() {
		this.status = Component.translatable("mco.download.cancelled");
	}

	@Environment(EnvType.CLIENT)
	public static class DownloadStatus {
		public volatile long bytesWritten;
		public volatile long totalBytes;
	}
}