package net.minecraft.commands.arguments.coordinates;

import com.mojang.brigadier.StringReader;
import com.mojang.brigadier.exceptions.CommandSyntaxException;
import com.mojang.brigadier.exceptions.SimpleCommandExceptionType;
import net.minecraft.network.chat.Component;

public record WorldCoordinate(boolean relative, double value) {
	private static final char PREFIX_RELATIVE = '~';
	public static final SimpleCommandExceptionType ERROR_EXPECTED_DOUBLE = new SimpleCommandExceptionType(Component.translatable("argument.pos.missing.double"));
	public static final SimpleCommandExceptionType ERROR_EXPECTED_INT = new SimpleCommandExceptionType(Component.translatable("argument.pos.missing.int"));

	public double get(final double original) {
		return this.relative ? this.value + original : this.value;
	}

	public static WorldCoordinate parseDouble(final StringReader reader, final boolean center) throws CommandSyntaxException {
		if (reader.canRead() && reader.peek() == '^') {
			throw Vec3Argument.ERROR_MIXED_TYPE.createWithContext(reader);
		} else if (!reader.canRead()) {
			throw ERROR_EXPECTED_DOUBLE.createWithContext(reader);
		} else {
			boolean relative = isRelative(reader);
			int start = reader.getCursor();
			double value = reader.canRead() && reader.peek() != ' ' ? reader.readDouble() : 0.0;
			String number = reader.getString().substring(start, reader.getCursor());
			if (relative && number.isEmpty()) {
				return new WorldCoordinate(true, 0.0);
			} else {
				if (!number.contains(".") && !relative && center) {
					value += 0.5;
				}

				return new WorldCoordinate(relative, value);
			}
		}
	}

	public static WorldCoordinate parseInt(final StringReader reader) throws CommandSyntaxException {
		if (reader.canRead() && reader.peek() == '^') {
			throw Vec3Argument.ERROR_MIXED_TYPE.createWithContext(reader);
		} else if (!reader.canRead()) {
			throw ERROR_EXPECTED_INT.createWithContext(reader);
		} else {
			boolean relative = isRelative(reader);
			double value;
			if (reader.canRead() && reader.peek() != ' ') {
				value = relative ? reader.readDouble() : reader.readInt();
			} else {
				value = 0.0;
			}

			return new WorldCoordinate(relative, value);
		}
	}

	public static boolean isRelative(final StringReader reader) {
		boolean relative;
		if (reader.peek() == '~') {
			relative = true;
			reader.skip();
		} else {
			relative = false;
		}

		return relative;
	}

	public boolean isRelative() {
		return this.relative;
	}
}