package inf101.v18.gfx.gfxmode;

import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Paint;
import javafx.scene.shape.Shape;

public interface IShape {

    /**
     * Add another point to the line path
     *
     * @param x
     * @param y
     * @return
     */
    IShape addPoint(double x, double y);

    /**
     * Add another point to the line path
     *
     * @param xy
     * @return
     */
    IShape addPoint(Point xy);

    /**
     * Set the arc angle for the subsequent draw commands
     *
     * <p>
     * For use with {@link #arc()}
     *
     * @param a The angle, in degrees
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape angle(double a);

    /**
     * Draw an arc with the current drawing parameters
     *
     * <p>
     * Relevant parameters:
     * <li>{@link #at(Point)}, {@link #x(double)}, {@link #gravity(double)}
     * <li>{@link #length(double)}
     * <li>{@link #angle(double)}
     * <li>{@link #gravity(Gravity)}
     * <li>{@link #stroke(Paint)}, {@link #fill(Paint)}
     * <li>{@link #rotation(double)}
     *
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape arc();

    /**
     * Set the (x,y)-coordinates of the next draw command
     *
     * @param p Coordinates
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape at(Point p);

    /**
     * Close the line path, turning it into a polygon.
     *
     * @return
     */
    IShape close();

    void draw();

    void draw(GraphicsContext context);

    /**
     * Draw an ellipse with the current drawing parameters
     *
     * <p>
     * Relevant parameters:
     * <li>{@link #at(Point)}, {@link #x(double)}, {@link #gravity(double)}
     * <li>{@link #width(double)}, {@link #height(double)}
     * <li>{@link #gravity(Gravity)}
     * <li>{@link #stroke(Paint)}, {@link #fill(Paint)}
     * <li>{@link #rotation(double)}
     *
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape ellipse();

    /**
     * Fill the current shape
     *
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape fill();

    /**
     * Set fill colour for the subsequent draw commands
     *
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape fillPaint(Paint p);

    /**
     * Set gravity for the subsequent draw commands
     * <p>
     * Gravity determines the point on the shape that will be used for positioning
     * and rotation.
     *
     * @param g The gravity
     * @return
     */
    IShape gravity(Gravity g);

    /**
     * Set the height of the next draw command
     *
     * @param h The height
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape height(double h);

    /**
     * Set the length of the following draw commands
     *
     * <p>
     * For use with {@link #line()} and {@link #arc()}
     *
     * @param l The length
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape length(double l);

    /**
     * Draw a line with the current drawing parameters
     *
     * <p>
     * Relevant parameters:
     * <li>{@link #at(Point)}, {@link #x(double)}, {@link #gravity(double)}
     * <li>{@link #length(double)}
     * <li>{@link #angle(double)}
     * <li>{@link #gravity(Gravity)} (flattened to the horizontal axis, so, e.g.,
     * {@link Gravity#NORTH} = {@link Gravity#SOUTH} = {@link Gravity#CENTER})
     * <li>{@link #stroke(Paint)}
     * <li>{@link #rotation(double)}
     *
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape line();

    /**
     * Draw a rectangle with the current drawing parameters
     *
     * <p>
     * Relevant parameters:
     * <li>{@link #at(Point)}, {@link #x(double)}, {@link #gravity(double)}
     * <li>{@link #width(double)}, {@link #height(double)}
     * <li>{@link #gravity(Gravity)}
     * <li>{@link #stroke(Paint)}, {@link #fill(Paint)}
     * <li>{@link #rotation(double)}
     *
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape rectangle();

    /**
     * Sets rotation for subsequent draw commands.
     *
     * <p>
     * Shapes will be rotate around the {@link #gravity(Gravity)} point.
     *
     * @param angle Rotation in degrees
     * @return
     */
    IShape rotation(double angle);

    /**
     * Stroke the current shape
     *
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape stroke();

    /**
     * Set stroke colour for the subsequent draw commands
     *
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape strokePaint(Paint p);

    Shape toFXShape();

    String toSvg();

    /**
     * Set the width of the next draw command
     *
     * @param w The width
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape width(double w);

    /**
     * Set the x-coordinate of the next draw command
     *
     * @param x Coordinate
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape x(double x);

    /**
     * Set the y-coordinate of the next draw command
     *
     * @param y Coordinate
     * @return <code>this</code>, for adding more drawing parameters or issuing the
     * draw command
     */
    IShape y(double y);

}