import { EventBus } from '../core/EventBus';
import { IEventBus } from '../types/CalendarTypes';

/**
 * URLManager handles URL query parameter parsing and deep linking functionality
 * Follows event-driven architecture with no global state
 */
export class URLManager {
    private eventBus: IEventBus;

    constructor(eventBus: IEventBus) {
        this.eventBus = eventBus;
    }

    /**
     * Parse eventId from URL query parameters
     * @returns eventId string or null if not found
     */
    public parseEventIdFromURL(): string | null {
        try {
            const urlParams = new URLSearchParams(window.location.search);
            const eventId = urlParams.get('eventId');
            
            if (eventId && eventId.trim() !== '') {
                return eventId.trim();
            }
            
            return null;
        } catch (error) {
            console.warn('URLManager: Failed to parse URL parameters:', error);
            return null;
        }
    }

    /**
     * Get all query parameters as an object
     * @returns object with all query parameters
     */
    public getAllQueryParams(): Record<string, string> {
        try {
            const urlParams = new URLSearchParams(window.location.search);
            const params: Record<string, string> = {};
            
            for (const [key, value] of urlParams.entries()) {
                params[key] = value;
            }
            
            return params;
        } catch (error) {
            console.warn('URLManager: Failed to parse URL parameters:', error);
            return {};
        }
    }

    /**
     * Update URL without page reload (for future use)
     * @param params object with parameters to update
     */
    public updateURL(params: Record<string, string | null>): void {
        try {
            const url = new URL(window.location.href);
            
            // Update or remove parameters
            Object.entries(params).forEach(([key, value]) => {
                if (value === null) {
                    url.searchParams.delete(key);
                } else {
                    url.searchParams.set(key, value);
                }
            });
            
            // Update URL without page reload
            window.history.replaceState({}, '', url.toString());
        } catch (error) {
            console.warn('URLManager: Failed to update URL:', error);
        }
    }

    /**
     * Check if current URL has any query parameters
     * @returns true if URL has query parameters
     */
    public hasQueryParams(): boolean {
        return window.location.search.length > 0;
    }
}