import {Object3D, Vector2} from 'three';
import {Constructor, ConvertToStrings} from '../../../../../types/GlobalTypes';
import {radToDeg} from '../../../../../core/math/_Module';
import {BaseRayObjectIntersectionsController} from './_BaseRayObjectIntersectionsController';
import {
	ObjectOptions,
	GPUOptions,
	CPUOptions,
	PriorityOptions,
	filterObjectsWithMatchButtonConfig,
	ButtonAndModifierOptions,
	ButtonAndModifierOptionsAsString,
	ButtonConfig,
	buttonConfigFromEvent,
	propertyMatchesButtonConfig,
} from './Common';
import {ParamConfig} from '../../../../nodes/utils/params/ParamsConfig';
import {MouseButton} from '../../../../../core/MouseButton';

interface SwipeOptions {
	angle: number;
	angleMargin: number;
	minDistance: number;
	callback: () => void;
}
export interface ObjectToSwipeOptions extends ObjectOptions {
	swipe: SwipeOptions;
	config: ButtonAndModifierOptions;
}
export interface ObjectToSwipeOptionsAsString {
	priority: ConvertToStrings<PriorityOptions>;
	cpu?: ConvertToStrings<CPUOptions>;
	gpu?: ConvertToStrings<GPUOptions>;
	swipe: ConvertToStrings<SwipeOptions>;
	config: ButtonAndModifierOptionsAsString;
}

const _tmp = new Vector2();
const _buttonConfig: ButtonConfig = {button: MouseButton.LEFT, ctrl: false, shift: false, alt: false};
function degAngle(radians: number) {
	if (radians > Math.PI) {
		radians -= Math.PI * 2;
	}
	return radToDeg(radians);
}
export const ANGLE_DEGREES = {
	LEFT: degAngle(_tmp.set(-1, 0).angle()),
	RIGHT: degAngle(_tmp.set(1, 0).angle()),
	UP: degAngle(_tmp.set(0, 1).angle()),
	DOWN: degAngle(_tmp.set(0, -1).angle()),
};
const DEFAULT_MIN_CURSOR_MOVE_DISTANCE = 0.05;

export function SwipeParamConfig<TBase extends Constructor>(Base: TBase) {
	return class Mixin extends Base {
		/** @param angle */
		angle = ParamConfig.FLOAT(0, {
			range: [-180, 180],
			rangeLocked: [true, false],
		});
		/** @param angle margin */
		angleMargin = ParamConfig.FLOAT(45, {
			range: [0, 180],
			rangeLocked: [true, false],
		});
		/** @param min distance */
		minDistance = ParamConfig.FLOAT(DEFAULT_MIN_CURSOR_MOVE_DISTANCE, {
			range: [0, 1],
			rangeLocked: [true, false],
		});
	};
}

function optionsContainsAngle(options: SwipeOptions, angle: number) {
	return angle >= options.angle - options.angleMargin && angle <= options.angle + options.angleMargin;
}
const _cursorDelta = new Vector2();
export class RayObjectIntersectionsSwipeController extends BaseRayObjectIntersectionsController {
	protected override _propertiesListByObject: Map<Object3D, ObjectToSwipeOptions[]> = new Map();
	protected _intersectedStateOnPointerdownByObject: Map<Object3D, boolean> = new Map();
	protected _intersectedStateOnPointerupByObject: Map<Object3D, boolean> = new Map();
	private _objectsMatchingEventConfig: Object3D[] = [];
	private _objectsIntersectedOnPointerdown: Object3D[] = [];
	private _cursorOnPointerdown = new Vector2();
	private _cursorOnPointerup = new Vector2();
	private _pointerdownEvent: Readonly<PointerEvent | MouseEvent | TouchEvent> | undefined;

	private _bound = {
		pointerup: this._onPointerup.bind(this),
	};
	onPointerdown(event: Readonly<PointerEvent | MouseEvent | TouchEvent>) {
		this._pointerdownEvent = event;
		if (this._objects.length == 0) {
			return;
		}
		filterObjectsWithMatchButtonConfig(
			event,
			this._objects,
			this._propertiesListByObject,
			this._objectsMatchingEventConfig
		);
		if (this._objectsMatchingEventConfig.length == 0) {
			return;
		}

		document.addEventListener('pointerup', this._bound.pointerup);
		// we also need touchend, as pointerup appears to not be triggered once the cursor has moved
		document.addEventListener('touchend', this._bound.pointerup);
		this._setIntersectedState(this._objectsMatchingEventConfig, this._intersectedStateOnPointerdownByObject);
		this._getCursor(this._cursorOnPointerdown);
	}
	private _onPointerup(_event: Event) {
		document.removeEventListener('pointerup', this._bound.pointerup);
		document.removeEventListener('touchend', this._bound.pointerup);
		const event = this._pointerdownEvent;
		if (!event) {
			return;
		}
		this._pointerdownEvent = undefined;

		const objects = this._objects;
		this._objectsIntersectedOnPointerdown.length = 0;

		for (const object of objects) {
			const propertiesList = this._propertiesListByObject.get(object);
			if (propertiesList) {
				const isIntersectingOnPointerdown = this._intersectedStateOnPointerdownByObject.get(object);
				if (isIntersectingOnPointerdown) {
					this._objectsIntersectedOnPointerdown.push(object);
				}
			}
		}

		// I've considered using only the objects intersected in pointerdown for the pointerup detection,
		// but that prevents missed objects from occluding others if they are in front.
		// We therefore need to run the detection on all objects
		// instead, we can still optimise by not detecting anything if that list is empty
		if (this._objectsIntersectedOnPointerdown.length == 0) {
			return;
		}

		// check swipe angle
		this._getCursor(this._cursorOnPointerup);
		_cursorDelta.copy(this._cursorOnPointerup).sub(this._cursorOnPointerdown);
		let radians = _cursorDelta.angle();
		const degrees = degAngle(radians);
		const distance = _cursorDelta.manhattanLength();

		//
		this._setIntersectedState(objects, this._intersectedStateOnPointerupByObject);
		buttonConfigFromEvent(event, _buttonConfig);
		const objectsIntersectedOnPointerdown = this._objectsIntersectedOnPointerdown;
		for (const object of objectsIntersectedOnPointerdown) {
			const propertiesList = this._propertiesListByObject.get(object);
			if (propertiesList) {
				const isIntersectingOnPointerup = this._intersectedStateOnPointerupByObject.get(object);
				if (isIntersectingOnPointerup == true) {
					for (const properties of propertiesList) {
						if (
							distance > properties.swipe.minDistance &&
							optionsContainsAngle(properties.swipe, degrees) &&
							propertyMatchesButtonConfig(properties.config, _buttonConfig)
						) {
							properties.swipe.callback();
						}
					}
				}
			}
		}
	}

	private _getCursor(target: Vector2) {
		const pointerEventsController = this._scene.eventsDispatcher.pointerEventsController;
		const cursor = pointerEventsController.cursor().value;
		target.copy(cursor);
	}
}