package de.ph87.electro.circuit.part;

import lombok.Getter;
import lombok.ToString;

import java.awt.*;
import java.awt.event.MouseEvent;

import static de.ph87.electro.CONFIG.RASTER;
import static de.ph87.electro.CONFIG.WIRE_HOVER_STROKE_BACK;
import static java.lang.Math.*;

@Getter
@ToString
public final class Position {

  public static final Position ZERO = new Position(0, 0);

  public final Point absolute;

  public final Point inside;

  public final Point raster;

  public Position(final int x, final int y) {
    this.absolute = new Point(x, y);
    this.raster = new Point(x / RASTER, y / RASTER);
    this.inside = new Point(x % RASTER, y % RASTER);
  }

  @Override
  public int hashCode() {
    return absolute.hashCode();
  }

  public Position(final double x, final double y) {
    this((int) round(x), (int) round(y));
  }

  public Position(final Point point) {
    this(point.x, point.y);
  }

  public Position(final MouseEvent event) {
    this(event.getX(), event.getY());
  }

  public Position plus(final Point vector) {
    return new Position(absolute.x + vector.x, absolute.y + vector.y);
  }

  public double distance(final Position position) {
    return sqrt(pow(position.absolute.x - absolute.x, 2) + pow(position.absolute.y - absolute.y, 2));
  }

  public boolean distanceToLine(final Position lineStart, final Position lineEnd) {
    double dx = lineEnd.absolute.x - lineStart.absolute.x;
    double dy = lineEnd.absolute.y - lineStart.absolute.y;
    double lineLength = dx * dx + dy * dy;
    if (lineLength == 0) {
      return distance(lineStart) <= WIRE_HOVER_STROKE_BACK.getLineWidth();
    }

    double t = ((absolute.x - lineStart.absolute.x) * dx + (absolute.y - lineStart.absolute.y) * dy) / lineLength;
    t = Math.max(0, Math.min(1, t));

    double closestX = lineStart.absolute.x + t * dx;
    double closestY = lineStart.absolute.y + t * dy;
    final double distance = sqrt(pow(closestX - absolute.x, 2) + pow(closestY - absolute.y, 2));
    return distance <= WIRE_HOVER_STROKE_BACK.getLineWidth();
  }

  public Position alignToRaster() {
    return new Position(raster.x * RASTER, raster.y * RASTER);
  }

}