package game.command;

import game.world.BlockPos;
import game.world.Position;

public class DoubleParser extends DefaultingParser {
	public static enum DefType {
		X, Y, Z, YAW, PITCH;
	}
	
	private final DefType defType;
	private final Double min;
	private final Double max;
	private final boolean center;
	
	public DoubleParser(String name, Double def, Double min, Double max, boolean center, Object ... completions) {
		super(name, def, completions);
		this.defType = null;
		this.min = min;
		this.max = max;
		this.center = center;
	}
	
	public DoubleParser(String name, DefType type, Double min, Double max, boolean center) {
		super(name, null);
		this.defType = type;
		this.min = min;
		this.max = max;
		this.center = center;
	}
	
	public Double parse(CommandEnvironment env, String input) {
		Double pre = this.defType != null && input.startsWith("~") ? this.getDefault(env) : null;
		input = pre != null ? input.substring(1) : input;
		double value;
		try {
			value = Double.parseDouble(input);
		}
		catch(NumberFormatException e) {
			throw new RunException("Ungültige Gleitkommazahl '%s'", input);
		}
		if(this.center && pre == null && input.indexOf('.') < 0)
			value += 0.5;
		if(this.min != null && value < this.min)
			if(this.max != null)
				throw new RunException("Die Zahl muss im Bereich %f .. %f liegen, habe %f", this.min, this.max, value);
			else
				throw new RunException("Die Zahl muss mindestens %f betragen, habe %f", this.min, value);
		if(this.max != null && value > this.max)
			if(this.min != null)
				throw new RunException("Die Zahl muss im Bereich %f .. %f liegen, habe %f", this.min, this.max, value);
			else
				throw new RunException("Die Zahl darf höchstens %f betragen, habe %f", this.max, value);
		return value;
	}
	
	public Double getDefault(CommandEnvironment env) {
		Position pos = this.defType == null ? null : env.getExecutor().getExecPos();
		switch(this.defType) {
			case X:
				return pos == null ? null : pos.x;
			case Y:
				return pos == null ? null : pos.y;
			case Z:
				return pos == null ? null : pos.z;
			case YAW:
				return pos == null ? null : (double)pos.yaw;
			case PITCH:
				return pos == null ? null : (double)pos.pitch;
		}
		return (Double)super.getDefault(env);
	}

	public Class<?> getTypeClass() {
		return this.hasDefault() ? double.class : Double.class;
	}
	
	public String[] getCompletions(CommandEnvironment env) {
		BlockPos pos = this.defType == null ? null : env.getExecutor().getPointedPosition();
		switch(this.defType) {
			case X:
				return pos == null ? null : new String[] {"" + pos.getX()};
			case Y:
				return pos == null ? null : new String[] {"" + pos.getY()};
			case Z:
				return pos == null ? null : new String[] {"" + pos.getZ()};
		}
		return super.getCompletions(env);
	}
}