import Cetra from '../../lib/lib.js';
/**
 * Represents a base component class.
 */
export default class BaseComponent {
	#data = new Map([
		['type', 'BaseComponent'],
		['selector', 'cetra-component'],
		['variables', new Map()],
		['cetraId', ''],
	]);

	/**
	 * Constructs a new instance of the BaseComponent class.
	 * @param {Map} data - The initial data for the component.
	 */
	constructor(data = new Map()) {
		for (const key of this.#data.keys()) {
			if (
				!data.has(key) ||
				typeof data.get(key) != typeof this.#data.get(key)
			)
				continue;
			this.#data.set(key, data.get(key));
		}
		this.#data = data;
	}

	/**
	 * Retrieves the value associated with the specified key from the data map.
	 * @param {string} key - The key to retrieve the value for.
	 * @returns {*} - The value associated with the key.
	 */
	get(key) {
		return this.#data.get(key);
	}

	/**
	 * Sets a key-value pair in the component's data.
	 * @param {string} key - The key to set.
	 * @param {*} value - The value to set.
	 * @returns {BaseComponent} - The updated component instance.
	 */
	set(key, value) {
		this.#data.set(key, value);
		return this;
	}

	/**
	 * Retrieves the value of a variable by its name.
	 *
	 * @param {string} varName - The name of the variable.
	 * @returns {*} - The value of the variable, or null if the variable is not found.
	 * @throws {Error} - If no Cetra instance is found.
	 */
	getValue(varName) {
		if (typeof varName != 'string') return null;
		if (varName.startsWith('$')) varName = varName.slice(1);
		if (!this.get('variables').has(varName)) return null;
		const frameWork = Cetra.getInstance(this.get('cetraId'));
		if (!frameWork) throw new Error('no cetra instance found');
		const varValue = frameWork.convertValue(
			this.get('variables').get(varName).get('type'),
			this.getVarNodes(varName).shift().textContent
		);
		return varValue;
	}

	/**
	 * Retrieves the value of a variable.
	 * @param {string} varName - The name of the variable.
	 * @returns {*} - The value of the variable.
	 */
	getVal(varName) {
		return this.getValue(varName);
	}

	/**
	 * Retrieves the value of a variable by its name.
	 *
	 * @param {string} varName - The name of the variable.
	 * @returns {*} - The value of the variable.
	 */
	getVar(varName) {
		return this.get('variables').get(varName);
	}

	/**
	 * Retrieves the DOM node associated with the component.
	 * @returns {HTMLElement} The DOM node.
	 * @throws {Error} If no node is found.
	 */
	getNode() {
		let node = document.querySelector(this.get('selector'));

		if (!node) node = document.getElementById(this.get('id'));
		if (!node) throw new Error('no node found');

		return node;
	}

	/**
	 * Retrieves all DOM nodes that have a data attribute matching the specified variable name.
	 * @param {string} varName - The name of the variable to search for.
	 * @returns {Array<HTMLElement>} - An array of DOM nodes matching the variable name.
	 * @throws {Error} - Throws an error if no cetra instance is found.
	 */
	getVarNodes(varName) {
		const frameWork = Cetra.getInstance(this.get('cetraId'));
		if (!frameWork) throw new Error('no cetra instance found');
		const varNodeSelector = `[data-${frameWork.getOption(
			'selector'
		)}-var^="${varName}"]`;
		return [...this.getNode().querySelectorAll(varNodeSelector)];
	}

	/**
	 * Updates the component with the given deltas.
	 * @param {Array} deltas - An array of deltas to apply.
	 * @throws {TypeError} If deltas is not an array.
	 * @throws {Error} If no cetra instance is found.
	 */
	update(deltas) {
		if (!Array.isArray(deltas))
			throw new TypeError('deltas must be an array');

		const frameWork = Cetra.getInstance(this.get('cetraId'));
		if (!frameWork) throw new Error('no cetra instance found');

		for (const delta of deltas) {
			const { new: value, old: oldValue, varName } = delta;
			if (!this.get('variables').has(varName)) continue;
			const variable = this.get('variables').get(varName);

			this.getVarNodes(varName).forEach((el) => {
				el.textContent = value ?? variable.get('default');
			});
		}
	}
}

class NewCetra {
	constructor(options = {}) {
		this.wrapper = options.wrapper || document.body;
		this.componentMap = new Map();
		this.variableMap = new Map();
		this.observer = null;
	}

	init() {
		this.discoverComponents();
		this.setupObserver();
		this.triggerHook('afterInit');
	}

	registerComponent(name, component) {
		this.componentMap.set(name, component);
	}

	getComponent(name) {
		return this.componentMap.get(name);
	}

	mountComponent(element) {
		const componentName = element.getAttribute('data-ctra');
		const component = this.getComponent(componentName) || this.getComponent('BaseComponent');

		if (!component) {
			console.warn(`Component "${componentName}" not found.`);
			return;
		}

		const instance = new component(element);
		element.__ctra_instance = instance;

		this.triggerHook('beforeComponentMount', instance);
		instance.mount();
		this.triggerHook('afterComponentMount', instance);
	}

	unmountComponent(element) {
		const instance = element.__ctra_instance;

		if (!instance) {
			console.warn('Unmounting a non-mounted component.');
			return;
		}

		this.triggerHook('beforeComponentUnmount', instance);
		instance.unmount();
		this.triggerHook('afterComponentUnmount', instance);

		delete element.__ctra_instance;
	}

	updateComponent(element) {
		const instance = element.__ctra_instance;

		if (!instance) {
			console.warn('Updating a non-mounted component.');
			return;
		}

		this.triggerHook('beforeComponentUpdate', instance);
		instance.update();
		this.triggerHook('afterComponentUpdate', instance);
	}

	getVariable(name) {
		return this.variableMap.get(name);
	}

	setVariable(name, value) {
		this.variableMap.set(name, value);
		this.updateVariableBindings(name);
	}

	discoverComponents() {
		const elements = this.wrapper.querySelectorAll('[data-ctra]');
		elements.forEach(element => this.mountComponent(element));
	}

	setupObserver() {
		this.observer = new MutationObserver(mutations => {
			mutations.forEach(mutation => {
				if (mutation.type === 'childList') {
					mutation.addedNodes.forEach(node => {
						if (node.nodeType === Node.ELEMENT_NODE && node.hasAttribute('data-ctra')) {
							this.mountComponent(node);
						}
					});

					mutation.removedNodes.forEach(node => {
						if (node.nodeType === Node.ELEMENT_NODE && node.__ctra_instance) {
							this.unmountComponent(node);
						}
					});
				} else if (mutation.type === 'attributes' && mutation.attributeName === 'data-ctra') {
					this.updateComponent(mutation.target);
				}
			});
		});

		this.observer.observe(this.wrapper, {
			childList: true,
			subtree: true,
			attributes: true,
			attributeFilter: ['data-ctra']
		});
	}

	updateVariableBindings(name) {
		const elements = this.wrapper.querySelectorAll(`[data-ctra-var="${name}"]`);
		elements.forEach(element => {
			const value = this.getVariable(name);
			element.textContent = value;
		});
	}

	triggerHook(name, ...args) {
		// Placeholder for triggering lifecycle hooks
		console.log(`Triggering hook: ${name}`, ...args);
	}
}