package net.minecraft.client.renderer;

import net.minecraft.client.Minecraft;
import net.minecraft.client.RotatingSectionStorage;
import net.minecraft.client.renderer.chunk.SectionRenderDispatcher;
import net.minecraft.core.BlockPos;
import net.minecraft.core.SectionPos;

public class ViewArea {
	private final SectionOcclusionGraph sectionOcclusionGraph;
	private final RotatingSectionStorage<SectionRenderDispatcher.RenderSection> sections;
	private final int minY;
	private final int maxY;

	public ViewArea(
		final SectionRenderDispatcher sectionRenderDispatcher,
		final int minY,
		final int maxY,
		final int minSectionY,
		final int maxSectionY,
		final int renderDistance,
		final SectionOcclusionGraph sectionOcclusionGraph
	) {
		this.sectionOcclusionGraph = sectionOcclusionGraph;
		this.minY = minY;
		this.maxY = maxY;
		if (!Minecraft.getInstance().isSameThread()) {
			throw new IllegalStateException("createSections called from wrong thread: " + Thread.currentThread().getName());
		} else {
			this.sections = new RotatingSectionStorage<>(
				renderDistance, minSectionY, maxSectionY, (index, sectionNode) -> sectionRenderDispatcher.new RenderSection(index, sectionNode)
			);
		}
	}

	public void releaseAllBuffers() {
		for (SectionRenderDispatcher.RenderSection section : this.sections) {
			section.reset();
		}
	}

	public int size() {
		return this.sections.size();
	}

	public int minY() {
		return this.minY;
	}

	public int maxY() {
		return this.maxY;
	}

	public int minSectionY() {
		return this.sections.minY();
	}

	public int maxSectionY() {
		return this.sections.maxY();
	}

	public int sectionCount() {
		return this.sections.height();
	}

	public int getViewDistance() {
		return this.sections.radius();
	}

	public boolean repositionCamera(final SectionPos cameraSectionPos) {
		boolean result = this.sections.repositionCenter(cameraSectionPos);
		if (result) {
			this.sectionOcclusionGraph.invalidate();
		}

		return result;
	}

	public SectionPos getCameraSectionPos() {
		return this.sections.centerSectionPos();
	}

	public SectionRenderDispatcher.RenderSection getRenderSectionAt(final BlockPos pos) {
		return this.sections.getValueAt(pos);
	}

	protected SectionRenderDispatcher.RenderSection getRenderSection(final long sectionNode) {
		return this.sections.getValue(sectionNode);
	}
}