import * as PropertySymbol from '../../PropertySymbol.js';
import Attr from '../attr/Attr.js';
import DOMException from '../../exception/DOMException.js';
import DOMExceptionNameEnum from '../../exception/DOMExceptionNameEnum.js';
import Element from './Element.js';
import NamespaceURI from '../../config/NamespaceURI.js';

/**
 * Named Node Map.
 *
 * @see https://developer.mozilla.org/en-US/docs/Web/API/NamedNodeMap
 */
export default class NamedNodeMap {
	[index: number]: Attr;

	// All items with the namespaceURI as prefix
	public [PropertySymbol.namespaceItems]: Map<string, Attr> = new Map();

	// Items without namespaceURI as prefix, where the HTML namespace is the default namespace
	public [PropertySymbol.namedItems]: Map<string, Attr> = new Map();

	public declare [PropertySymbol.ownerElement]: Element;

	/**
	 * Constructor.
	 *
	 * @param ownerElement Owner element.
	 */
	constructor(ownerElement: Element) {
		this[PropertySymbol.ownerElement] = ownerElement;
	}

	/**
	 * Returns length.
	 *
	 * @returns Length.
	 */
	public get length(): number {
		return this[PropertySymbol.namespaceItems].size;
	}

	/**
	 * Returns string.
	 *
	 * @returns string.
	 */
	public get [Symbol.toStringTag](): string {
		return 'NamedNodeMap';
	}

	/**
	 * Returns string.
	 *
	 * @returns string.
	 */
	public toString(): string {
		return '[object NamedNodeMap]';
	}

	/**
	 * Iterator.
	 *
	 * @returns Iterator.
	 */
	public [Symbol.iterator](): IterableIterator<Attr> {
		return this[PropertySymbol.namespaceItems].values();
	}

	/**
	 * Returns item by index.
	 *
	 * @param index Index.
	 */
	public item(index: number): Attr | null {
		const items = Array.from(this[PropertySymbol.namespaceItems].values());
		return index >= 0 && items[index] ? items[index] : null;
	}

	/**
	 * Returns named item.
	 *
	 * @param name Name.
	 * @returns Item.
	 */
	public getNamedItem(name: string): Attr | null {
		return (
			this[PropertySymbol.namedItems].get(
				this[PropertySymbol.getNamedItemKey](
					this[PropertySymbol.ownerElement][PropertySymbol.namespaceURI],
					name
				)
			) || null
		);
	}

	/**
	 * Returns item by name and namespace.
	 *
	 * @param namespace Namespace.
	 * @param localName Local name of the attribute.
	 * @returns Item.
	 */
	public getNamedItemNS(namespace: string, localName: string): Attr | null {
		for (const item of this[PropertySymbol.namespaceItems].values()) {
			if (
				item[PropertySymbol.namespaceURI] === namespace &&
				item[PropertySymbol.localName] === localName
			) {
				return item;
			}
		}
		return null;
	}

	/**
	 * Sets named item.
	 *
	 * @param item Item.
	 * @returns Replaced item.
	 */
	public setNamedItem(item: Attr): Attr | null {
		return this[PropertySymbol.setNamedItem](item);
	}

	/**
	 * Adds a new namespaced item.
	 *
	 * @alias setNamedItem()
	 * @param item Item.
	 * @returns Replaced item.
	 */
	public setNamedItemNS(item: Attr): Attr | null {
		return this[PropertySymbol.setNamedItem](item);
	}

	/**
	 * Removes an item.
	 *
	 * @throws DOMException
	 * @param name Name of item.
	 * @returns Removed item.
	 */
	public removeNamedItem(name: string): Attr {
		const item = this.getNamedItem(name);

		if (!item) {
			throw new DOMException(
				`Failed to execute 'removeNamedItem' on 'NamedNodeMap': No item with name '${name}' was found.`,
				DOMExceptionNameEnum.notFoundError
			);
		}

		this[PropertySymbol.removeNamedItem](item);

		return item;
	}

	/**
	 * Removes a namespaced item.
	 *
	 * @param namespace Namespace.
	 * @param localName Local name of the item.
	 * @returns Removed item.
	 */
	public removeNamedItemNS(namespace: string, localName: string): Attr | null {
		const item = this.getNamedItemNS(namespace, localName);

		if (!item) {
			throw new DOMException(
				`Failed to execute 'removeNamedItemNS' on 'NamedNodeMap': No item with name '${localName}' in namespace '${namespace}' was found.`,
				DOMExceptionNameEnum.notFoundError
			);
		}

		this[PropertySymbol.removeNamedItem](item);

		return item;
	}

	/**
	 * Sets named item.
	 *
	 * @param item Item.
	 * @param [ignoreListeners] Ignore listeners.
	 * @returns Replaced item.
	 */
	public [PropertySymbol.setNamedItem](item: Attr, ignoreListeners = false): Attr {
		if (!item[PropertySymbol.name]) {
			return null;
		}

		item[PropertySymbol.ownerElement] = this[PropertySymbol.ownerElement];

		const namespaceItemKey = this[PropertySymbol.getNamespaceItemKey](item);
		const replacedItem = this[PropertySymbol.namespaceItems].get(namespaceItemKey) || null;
		const replacedNamedItem =
			this[PropertySymbol.namedItems].get(item[PropertySymbol.name]) || null;

		this[PropertySymbol.namespaceItems].set(namespaceItemKey, item);

		// The HTML namespace should be prioritized over other namespaces in the namedItems map
		// The HTML namespace is the default namespace
		if (
			(!replacedNamedItem ||
				(replacedNamedItem[PropertySymbol.namespaceURI] &&
					replacedNamedItem[PropertySymbol.namespaceURI] !== NamespaceURI.html) ||
				!item[PropertySymbol.namespaceURI] ||
				item[PropertySymbol.namespaceURI] === NamespaceURI.html) &&
			// Only lower case names should be stored in the namedItems map
			(this[PropertySymbol.ownerElement][PropertySymbol.namespaceURI] !== NamespaceURI.html ||
				item[PropertySymbol.name].toLowerCase() === item[PropertySymbol.name])
		) {
			this[PropertySymbol.namedItems].set(item[PropertySymbol.name], item);
		}

		if (!ignoreListeners) {
			this[PropertySymbol.ownerElement][PropertySymbol.onSetAttribute](item, replacedItem);
		}

		return replacedItem;
	}

	/**
	 * Removes named item.
	 *
	 * @param item Item.
	 * @param ignoreListeners
	 */
	public [PropertySymbol.removeNamedItem](item: Attr, ignoreListeners = false): void {
		item[PropertySymbol.ownerElement] = null;
		this[PropertySymbol.namespaceItems].delete(this[PropertySymbol.getNamespaceItemKey](item));
		this[PropertySymbol.namedItems].delete(
			this[PropertySymbol.getNamedItemKey](
				this[PropertySymbol.ownerElement][PropertySymbol.namespaceURI],
				item[PropertySymbol.name]
			)
		);

		if (!ignoreListeners) {
			this[PropertySymbol.ownerElement][PropertySymbol.onRemoveAttribute](item);
		}
	}

	/**
	 * Returns item name based on namespace.
	 *
	 * @param namespaceURI Namespace.
	 * @param name Name.
	 * @returns Item name based on namespace.
	 */
	private [PropertySymbol.getNamedItemKey](namespaceURI: string, name: string): string {
		if (!namespaceURI || namespaceURI === NamespaceURI.html) {
			return name.toLowerCase();
		}
		return name;
	}

	/**
	 * Returns item key.
	 *
	 * @param item Item.
	 * @returns Key.
	 */
	private [PropertySymbol.getNamespaceItemKey](item: Attr): string {
		if (
			!item[PropertySymbol.namespaceURI] ||
			item[PropertySymbol.namespaceURI] === NamespaceURI.html
		) {
			return item[PropertySymbol.name].toLowerCase();
		}
		return `${item[PropertySymbol.namespaceURI] || ''}:${item[PropertySymbol.name]}`;
	}
}