export default class BaseComponent extends HTMLElement {
    constructor() {
        super();
        this.attachShadow({ mode: 'open' });
        this._state = {};
        this._unsubscribers = [];
    }

    connectedCallback() {
        this.render();
        this._setupListeners();
        this._subscribe();
    }

    disconnectedCallback() {
        this._unsubscribers.forEach(unsubscribe => unsubscribe?.());
        this._cleanup();
    }

    attributeChangedCallback(name, oldValue, newValue) {
        if (oldValue !== newValue) {
            this.render();
        }
    }

    render() {
        if (!this.shadowRoot) return;

        const style = this._getStyles();
        const template = this._getTemplate();

        this.shadowRoot.innerHTML = `${style}${template}`;
    }

    _getStyles() {
        return '<style>:host { display: block; }</style>';
    }

    _getTemplate() {
        return '';
    }

    _setupListeners() {
    }

    _subscribe() {
    }

    _cleanup() {
    }

    emit(eventName, detail = {}) {
        this.dispatchEvent(
            new CustomEvent(eventName, {
                detail,
                bubbles: true,
                composed: true
            })
        );
    }

    setState(updates) {
        this._state = { ...this._state, ...updates };
        this.render();
    }

    getState() {
        return { ...this._state };
    }

    querySelector(selector) {
        return this.shadowRoot?.querySelector(selector);
    }

    querySelectorAll(selector) {
        return this.shadowRoot?.querySelectorAll(selector) || [];
    }
}