/**
 * Base class for all visual stimuli.
 *
 * @author Alain Pitiot
 * @version 2021.2.0
 * @copyright (c) 2017-2020 Ilixa Ltd. (http://ilixa.com) (c) 2020-2021 Open Science Tools Ltd. (https://opensciencetools.org)
 * @license Distributed under the terms of the MIT License
 */

import * as PIXI from "pixi.js-legacy";
import { MinimalStim } from "../core/MinimalStim.js";
import { WindowMixin } from "../core/WindowMixin.js";
import * as util from "../util/Util.js";

/**
 * Base class for all visual stimuli.
 *
 * @name module:visual.VisualStim
 * @class
 * @extends MinimalStim
 * @mixes WindowMixin
 * @param {Object} options
 * @param {String} options.name - the name used when logging messages from this stimulus
 * @param {module:core.Window} options.win - the associated Window
 * @param {string} [options.units= "height"] - the units of the stimulus (e.g. for size, position, vertices)
 * @param {number} [options.ori= 0.0] - the orientation (in degrees)
 * @param {number} [options.opacity= 1.0] - the opacity
 * @param {number} [options.depth= 0] - the depth (i.e. the z order)
 * @param {Array.<number>} [options.pos= [0, 0]] - the position of the center of the stimulus
 * @param {number} [options.size= 1.0] - the size
 * @param {PIXI.Graphics} [options.clipMask= null] - the clip mask
 * @param {boolean} [options.autoDraw= false] - whether or not the stimulus should be automatically drawn on every frame flip
 * @param {boolean} [options.autoLog= false] - whether or not to log
 */
export class VisualStim extends util.mix(MinimalStim).with(WindowMixin)
{
	constructor({ name, win, units, ori, opacity, depth, pos, size, clipMask, autoDraw, autoLog } = {})
	{
		super({ win, name, autoDraw, autoLog });

		this._addAttribute(
			"units",
			units,
			(typeof win !== "undefined" && win !== null) ? win.units : "height",
			this._onChange(true, true),
		);
		this._addAttribute(
			"pos",
			pos,
			[0, 0],
		);
		this._addAttribute(
			"size",
			size,
			undefined,
		);
		this._addAttribute(
			"ori",
			ori,
			0.0,
		);
		this._addAttribute(
			"opacity",
			opacity,
			1.0,
			this._onChange(true, false),
		);
		this._addAttribute(
			"depth",
			depth,
			0,
			this._onChange(false, false),
		);
		this._addAttribute(
			"clipMask",
			clipMask,
			null,
			this._onChange(false, false),
		);

		// bounding box of the stimulus, in stimulus units
		// note: boundingBox does not take the orientation into account
		this._addAttribute("boundingBox", PIXI.Rectangle.EMPTY);

		// the stimulus need to be updated:
		this._needUpdate = true;

		// the PIXI representation also needs to be updated:
		this._needPixiUpdate = true;
	}

	/**
	 * Force a refresh of the stimulus.
	 *
	 * refresh() is called, in particular, when the Window is resized.
	 *
	 * @name module:visual.VisualStim#refresh
	 * @public
	 */
	refresh()
	{
		this._onChange(true, true)();
	}

	/**
	 * Setter for the size attribute.
	 *
	 * @name module:visual.VisualStim#setSize
	 * @public
	 * @param {undefined | null | number | number[]} size - the stimulus size
	 * @param {boolean} [log= false] - whether of not to log
	 */
	setSize(size, log = false)
	{
		// size is either undefined, null, or a tuple of numbers:
		if (typeof size !== "undefined" && size !== null)
		{
			size = util.toNumerical(size);
			if (!Array.isArray(size))
			{
				size = [size, size];
			}
		}

		const hasChanged = this._setAttribute("size", size, log);

		if (hasChanged)
		{
			this._onChange(true, true)();
		}
	}

	/**
	 * Setter for the orientation attribute.
	 *
	 * @name module:visual.VisualStim#setOri
	 * @public
	 * @param {number} ori - the orientation in degree with 0 as the vertical position, positive values rotate clockwise.
	 * @param {boolean} [log= false] - whether of not to log
	 */
	setOri(ori, log = false)
	{
		const hasChanged = this._setAttribute("ori", ori, log);

		if (hasChanged)
		{
			let radians = -ori * 0.017453292519943295;
			this._rotationMatrix = [
				[Math.cos(radians), -Math.sin(radians)],
				[Math.sin(radians), Math.cos(radians)]
			];

			if (this._pixi instanceof PIXI.DisplayObject) {
				this._pixi.rotation = -ori * Math.PI / 180;
			} else {
				this._onChange(true, true)();
			}
		}
	}

	/**
	 * Setter for the position attribute.
	 *
	 * @name module:visual.VisualStim#setPos
	 * @public
	 * @param {Array.<number>} pos - position of the center of the stimulus, in stimulus units
	 * @param {boolean} [log= false] - whether of not to log
	 */
	setPos(pos, log = false)
	{
		const prevPos = this._pos;
		const hasChanged = this._setAttribute("pos", util.toNumerical(pos), log);

		if (hasChanged)
		{
			this._needUpdate = true;

			// update the bounding box, without calling _estimateBoundingBox:
			this._boundingBox.x += this._pos[0] - prevPos[0];
			this._boundingBox.y += this._pos[1] - prevPos[1];
		}
	}

	/**
	 * Setter for the depth attribute.
	 *
	 * @name module:visual.VisualStim#setDepth
	 * @public
	 * @param {Array.<number>} depth - order in which stimuli is rendered, kind of css's z-index with a negative sign.
	 * @param {boolean} [log= false] - whether of not to log
	 */
	setDepth (depth = 0, log = false) {
		this._setAttribute("depth", depth, log);
		if (this._pixi) {
			this._pixi.zIndex = -this._depth;
		}
	}

	/**
	 * Determine whether an object is inside the bounding box of the stimulus.
	 *
	 * @name module:visual.VisualStim#contains
	 * @public
	 * @param {Object} object - the object
	 * @param {string} units - the units
	 * @return {boolean} whether or not the object is inside the bounding box of the stimulus
	 */
	contains(object, units)
	{
		// get the position of the object, in pixel coordinates:
		const objectPos_px = util.getPositionFromObject(object, units);

		if (typeof objectPos_px === "undefined")
		{
			throw {
				origin: "VisualStim.contains",
				context: "when determining whether VisualStim: " + this._name + " contains object: " + util.toString(object),
				error: "unable to determine the position of the object",
			};
		}

		// test for inclusion:
		return this._getBoundingBox_px().contains(objectPos_px[0], objectPos_px[1]);
	}

	/**
	 * Estimate the bounding box.
	 *
	 * @name module:visual.VisualStim#_estimateBoundingBox
	 * @function
	 * @protected
	 */
	_estimateBoundingBox()
	{
		throw {
			origin: "VisualStim._estimateBoundingBox",
			context: `when estimating the bounding box of visual stimulus: ${this._name}`,
			error: "this method is abstract and should not be called.",
		};
	}

	/**
	 * Get the bounding box in pixel coordinates
	 *
	 * @name module:visual.VisualStim#contains
	 * @function
	 * @protected
	 * @returns {PIXI.Rectangle} the bounding box, in pixel coordinates
	 */
	_getBoundingBox_px()
	{
		if (this._units === "pix")
		{
			return this._boundingBox.clone();
		}
		else if (this._units === "norm")
		{
			return new PIXI.Rectangle(
				this._boundingBox.x * this._win.size[0] / 2,
				this._boundingBox.y * this._win.size[1] / 2,
				this._boundingBox.width * this._win.size[0] / 2,
				this._boundingBox.height * this._win.size[1] / 2,
			);
		}
		else if (this._units === "height")
		{
			const minSize = Math.min(this._win.size[0], this._win.size[1]);
			return new PIXI.Rectangle(
				this._boundingBox.x * minSize,
				this._boundingBox.y * minSize,
				this._boundingBox.width * minSize,
				this._boundingBox.height * minSize,
			);
		}
		else
		{
			throw Object.assign(response, { error: `unknown units: ${this._units}` });
		}
	}

	/**
	 * Generate a callback that prepares updates to the stimulus.
	 * This is typically called in the constructor of a stimulus, when attributes are added
	 * 	with _addAttribute.
	 *
	 * @name module:visual.VisualStim#_onChange
	 * @function
	 * @protected
	 * @param {boolean} [withPixi = false] - whether or not the PIXI representation must
	 * 	also be updated
	 * @param {boolean} [withBoundingBox = false] - whether or not to immediately estimate
	 * 	the bounding box
	 * @return {Function}
	 */
	_onChange(withPixi = false, withBoundingBox = false)
	{
		return () =>
		{
			this._needUpdate = true;
			if (withPixi)
			{
				this._needPixiUpdate = true;
			}
			if (withBoundingBox)
			{
				this._estimateBoundingBox();
			}
		};
	}
}