package de.ph87.electro.circuit.wire;

import de.ph87.electro.circuit.part.node.Node;
import lombok.Getter;
import lombok.NonNull;
import lombok.Setter;
import lombok.ToString;

import java.awt.*;
import java.awt.geom.Rectangle2D;

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

@Getter
@ToString
public class Wire {

  @NonNull
  private final Node a;

  @NonNull
  private final Node b;

  @Setter
  private double current = Double.NaN;

  @Setter
  private boolean ghost = false;

  public Wire(@NonNull final Node a, @NonNull final Node b) {
    this.a = a;
    this.b = b;
    a.getWires().add(this);
    b.getWires().add(this);
  }

  public boolean intersects(final Point position) {
    return distanceToLine(position, a.getPosition(), b.getPosition());
  }

  public boolean distanceToLine(final Point point, final Point lineStart, final Point lineEnd) {
    double dx = lineEnd.x - lineStart.x;
    double dy = lineEnd.y - lineStart.y;
    double lineLength = dx * dx + dy * dy;
    if (lineLength == 0) {
      return sqrt(pow(lineStart.x - point.x, 2) + pow(lineStart.y - point.y, 2)) <= WIRE_HOVER_STROKE_BACK.getLineWidth();
    }

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

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

  public Node getOpposite(final Node node) {
    if (a == node) {
      return b;
    } else if (b == node) {
      return a;
    }
    throw new RuntimeException();
  }

  public double getCurrent(final Node node) {
    return node == a ? current : -current;
  }

  public void draw(final Graphics2D g) {
    final Color color = ghost ? new Color(a.getColor().getRed(), a.getColor().getGreen(), a.getColor().getBlue(), 64) : a.getColor();

    g.setColor(color);
    g.setStroke(WIRE_STROKE);
    g.drawLine(a.getPosition().x, a.getPosition().y, b.getPosition().x, b.getPosition().y);

    if (SHOW_WIRE_DETAILS) {
      drawValues(g, "%.2f A".formatted(abs(current)), -0.5);
      drawValues(g, "%.2f V".formatted(a.getVoltage()), +0.5);
    }
  }

  private void drawValues(final Graphics2D g, final String string, final double offset) {
    g.setFont(LABEL_FONT);
    final Rectangle2D bounds = g.getFontMetrics().getStringBounds(string, g);
    final Point aa = a.getPosition();
    final Point bb = b.getPosition();

    final int mx = (aa.x + bb.x) / 2;
    final int my = (aa.y + bb.y) / 2;

    final int bx = (int) round((mx - bounds.getWidth() / 2)) - 2;
    final int by = (int) round((my - bounds.getHeight() / 2) + offset * bounds.getHeight()) - 2;
    g.setColor(new Color(255, 255, 255, 200));
    g.fillRect(bx, by, (int) round(bounds.getWidth()) + 4, (int) round(bounds.getHeight()) + 4);

    final int sx = (int) round((mx - bounds.getWidth() / 2));
    final int sy = (int) round(my + bounds.getHeight() / 3 + offset * bounds.getHeight());
    g.setColor(a.getColor());
    g.drawString(string, sx, sy);
  }

}