import { Path } from "./Path.ts";
import { Shape } from "./Shape.ts";

/** Builder for Shape objects from SVG-style subpaths. */
export class ShapePath {
	type = "ShapePath";
	#subPaths: Path[] = [];
	#currentPath: Path | undefined = undefined;

	/** Starts a new sub-path at (x, y). */
	moveTo(x: number, y: number): this {
		this.#currentPath = new Path();
		this.#subPaths.push(this.#currentPath);
		this.#currentPath.moveTo(x, y);
		return this;
	}

	lineTo(x: number, y: number): this {
		this.#currentPath?.lineTo(x, y);
		return this;
	}

	quadraticCurveTo(cpX: number, cpY: number, x: number, y: number): this {
		this.#currentPath?.quadraticCurveTo(cpX, cpY, x, y);
		return this;
	}

	bezierCurveTo(
		cp1X: number,
		cp1Y: number,
		cp2X: number,
		cp2Y: number,
		x: number,
		y: number,
	): this {
		this.#currentPath?.bezierCurveTo(cp1X, cp1Y, cp2X, cp2Y, x, y);
		return this;
	}

	/**
	 * Converts accumulated sub-paths into Shape objects.
	 * Each sub-path becomes a Shape; isCCW controls winding-order interpretation.
	 */
	toShapes(_isCCW = false): Shape[] {
		if (this.#subPaths.length === 0) return [];

		const shapes: Shape[] = [];
		for (const path of this.#subPaths) {
			const shape = new Shape();
			for (const curve of path.curves) shape.add(curve);
			shapes.push(shape);
		}
		return shapes;
	}
}