import Node from '../node/Node.js';
import * as PropertySymbol from '../../PropertySymbol.js';
import Element from '../element/Element.js';
import QuerySelector from '../../query-selector/QuerySelector.js';
import ParentNodeUtility from '../parent-node/ParentNodeUtility.js';
import HTMLCollection from '../element/HTMLCollection.js';
import ElementUtility from '../element/ElementUtility.js';
import NodeList from '../node/NodeList.js';
import NodeTypeEnum from '../node/NodeTypeEnum.js';
import IHTMLElementTagNameMap from '../../config/IHTMLElementTagNameMap.js';
import ISVGElementTagNameMap from '../../config/ISVGElementTagNameMap.js';

/**
 * DocumentFragment.
 */
export default class DocumentFragment extends Node {
	public readonly [PropertySymbol.children]: HTMLCollection<Element> = new HTMLCollection();
	public [PropertySymbol.rootNode]: Node = this;
	public [PropertySymbol.nodeType] = NodeTypeEnum.documentFragmentNode;

	/**
	 * Returns the document fragment children.
	 */
	public get children(): HTMLCollection<Element> {
		return this[PropertySymbol.children];
	}

	/**
	 * Last element child.
	 *
	 * @returns Element.
	 */
	public get childElementCount(): number {
		return this[PropertySymbol.children].length;
	}

	/**
	 * First element child.
	 *
	 * @returns Element.
	 */
	public get firstElementChild(): Element {
		return this[PropertySymbol.children][0] ?? null;
	}

	/**
	 * Last element child.
	 *
	 * @returns Element.
	 */
	public get lastElementChild(): Element {
		return this[PropertySymbol.children][this[PropertySymbol.children].length - 1] ?? null;
	}

	/**
	 * Get text value of children.
	 *
	 * @returns Text content.
	 */
	public get textContent(): string {
		let result = '';
		for (const childNode of this[PropertySymbol.childNodes]) {
			if (
				childNode[PropertySymbol.nodeType] === NodeTypeEnum.elementNode ||
				childNode[PropertySymbol.nodeType] === NodeTypeEnum.textNode
			) {
				result += childNode.textContent;
			}
		}
		return result;
	}

	/**
	 * Sets text content.
	 *
	 * @param textContent Text content.
	 */
	public set textContent(textContent: string) {
		for (const child of this[PropertySymbol.childNodes].slice()) {
			this.removeChild(child);
		}
		if (textContent) {
			this.appendChild(this[PropertySymbol.ownerDocument].createTextNode(textContent));
		}
	}

	/**
	 * Inserts a set of Node objects or DOMString objects after the last child of the ParentNode. DOMString objects are inserted as equivalent Text nodes.
	 *
	 * @param nodes List of Node or DOMString.
	 */
	public append(...nodes: (Node | string)[]): void {
		ParentNodeUtility.append(this, ...nodes);
	}

	/**
	 * Inserts a set of Node objects or DOMString objects before the first child of the ParentNode. DOMString objects are inserted as equivalent Text nodes.
	 *
	 * @param nodes List of Node or DOMString.
	 */
	public prepend(...nodes: (Node | string)[]): void {
		ParentNodeUtility.prepend(this, ...nodes);
	}

	/**
	 * Replaces the existing children of a node with a specified new set of children.
	 *
	 * @param nodes List of Node or DOMString.
	 */
	public replaceChildren(...nodes: (Node | string)[]): void {
		ParentNodeUtility.replaceChildren(this, ...nodes);
	}

	/**
	 * Query CSS selector to find matching nodes.
	 *
	 * @param selector CSS selector.
	 * @returns Matching elements.
	 */
	public querySelectorAll<K extends keyof IHTMLElementTagNameMap>(
		selector: K
	): NodeList<IHTMLElementTagNameMap[K]>;

	/**
	 * Query CSS selector to find matching elments.
	 *
	 * @param selector CSS selector.
	 * @returns Matching elements.
	 */
	public querySelectorAll<K extends keyof ISVGElementTagNameMap>(
		selector: K
	): NodeList<ISVGElementTagNameMap[K]>;

	/**
	 * Query CSS selector to find matching elments.
	 *
	 * @param selector CSS selector.
	 * @returns Matching elements.
	 */
	public querySelectorAll(selector: string): NodeList<Element>;

	/**
	 * Query CSS selector to find matching elments.
	 *
	 * @param selector CSS selector.
	 * @returns Matching elements.
	 */
	public querySelectorAll(selector: string): NodeList<Element> {
		return QuerySelector.querySelectorAll(this, selector);
	}

	/**
	 * Query CSS Selector to find matching node.
	 *
	 * @param selector CSS selector.
	 * @returns Matching element.
	 */
	public querySelector<K extends keyof IHTMLElementTagNameMap>(
		selector: K
	): IHTMLElementTagNameMap[K] | null;

	/**
	 * Query CSS Selector to find a matching element.
	 *
	 * @param selector CSS selector.
	 * @returns Matching element.
	 */
	public querySelector<K extends keyof ISVGElementTagNameMap>(
		selector: K
	): ISVGElementTagNameMap[K] | null;

	/**
	 * Query CSS Selector to find a matching element.
	 *
	 * @param selector CSS selector.
	 * @returns Matching element.
	 */
	public querySelector(selector: string): Element | null;

	/**
	 * Query CSS Selector to find a matching element.
	 *
	 * @param selector CSS selector.
	 * @returns Matching element.
	 */
	public querySelector(selector: string): Element | null {
		return QuerySelector.querySelector(this, selector);
	}

	/**
	 * Returns an element by ID.
	 *
	 * @param id ID.
	 * @returns Matching element.
	 */
	public getElementById(id: string): Element {
		return ParentNodeUtility.getElementById(this, id);
	}

	/**
	 * Clones a node.
	 *
	 * @override
	 * @param [deep=false] "true" to clone deep.
	 * @returns Cloned node.
	 */
	public cloneNode(deep = false): DocumentFragment {
		const clone = <DocumentFragment>super.cloneNode(deep);

		if (deep) {
			for (const node of clone[PropertySymbol.childNodes]) {
				if (node[PropertySymbol.nodeType] === NodeTypeEnum.elementNode) {
					clone[PropertySymbol.children].push(<Element>node);
				}
			}
		}

		return <DocumentFragment>clone;
	}

	/**
	 * @override
	 */
	public override appendChild(node: Node): Node {
		// We do not call super here as this will be handled by ElementUtility to improve performance by avoiding validation and other checks.
		return ElementUtility.appendChild(this, node);
	}

	/**
	 * @override
	 */
	public override removeChild(node: Node): Node {
		// We do not call super here as this will be handled by ElementUtility to improve performance by avoiding validation and other checks.
		return ElementUtility.removeChild(this, node);
	}

	/**
	 * @override
	 */
	public override insertBefore(newNode: Node, referenceNode: Node | null): Node {
		if (arguments.length < 2) {
			throw new TypeError(
				`Failed to execute 'insertBefore' on 'Node': 2 arguments required, but only ${arguments.length} present.`
			);
		}

		// We do not call super here as this will be handled by ElementUtility to improve performance by avoiding validation and other checks.
		return ElementUtility.insertBefore(this, newNode, referenceNode);
	}
}