/**
 * NewsTicker - Scrolling news/announcement ticker for landscape kiosk mode
 * Fetches from /api/ticker with fallback to hardcoded messages
 */

class NewsTicker {
    constructor(options = {}) {
        this.options = {
            containerId: options.containerId || 'news-ticker',
            fetchUrl: options.fetchUrl || '/api/ticker',
            refreshInterval: options.refreshInterval || 5 * 60 * 1000, // 5 minutes
            fallbackMessages: options.fallbackMessages || [
                'Välkommen till Ambassaderna',
                'Håll dörren stängd',
                'Tvättstugan stänger kl 22:00'
            ],
            ...options
        };

        this.container = null;
        this.contentEl = null;
        this.messages = [];
        this.refreshTimer = null;

        this.init();
    }

    init() {
        this.container = document.getElementById(this.options.containerId);
        if (!this.container) return;

        this.contentEl = this.container.querySelector('.ticker-content');
        if (!this.contentEl) {
            this.contentEl = document.createElement('div');
            this.contentEl.className = 'ticker-content';
            this.container.appendChild(this.contentEl);
        }

        this.fetchMessages();
        this.refreshTimer = setInterval(() => this.fetchMessages(), this.options.refreshInterval);
    }

    async fetchMessages() {
        try {
            const response = await fetch(this.options.fetchUrl);
            if (response.ok) {
                const data = await response.json();
                if (Array.isArray(data.messages) && data.messages.length > 0) {
                    this.messages = data.messages;
                } else {
                    this.messages = this.options.fallbackMessages;
                }
            } else {
                this.messages = this.options.fallbackMessages;
            }
        } catch {
            this.messages = this.options.fallbackMessages;
        }

        this.render();
    }

    render() {
        if (!this.contentEl || this.messages.length === 0) return;

        const separator = '  \u2022  '; // bullet separator
        const text = this.messages.join(separator);
        // Duplicate text for seamless infinite scroll loop
        this.contentEl.textContent = text + separator + text;
    }

    stop() {
        if (this.refreshTimer) {
            clearInterval(this.refreshTimer);
            this.refreshTimer = null;
        }
    }
}

// ES module export
export { NewsTicker };

// Keep window reference for backward compatibility
window.NewsTicker = NewsTicker;