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/**
 * Configuration utilities for environment-specific URLs
 */

// Check if we're running in browser
const isBrowser = typeof window !== 'undefined';

/**
 * Get the SPACE_HOST from various sources
 */
function getSpaceHost(): string | undefined {
    if (!isBrowser) return undefined;
    
    // Check window.SPACE_HOST (injected by container)
    if ((window as unknown as { SPACE_HOST?: string }).SPACE_HOST) {
        return (window as unknown as { SPACE_HOST: string }).SPACE_HOST;
    }
    
    // Check if current hostname looks like HF Spaces
    const hostname = window.location.hostname;
    if (hostname.includes('hf.space') || hostname.includes('huggingface.co')) {
        return hostname;
    }
    
    return undefined;
}

/**
 * Get the base URL for API requests
 */
export function getApiBaseUrl(): string {
    if (!isBrowser) return 'http://localhost:7860';
    
    // Check for Hugging Face Spaces
    const spaceHost = getSpaceHost();
    if (spaceHost) {
        return `https://${spaceHost}`;
    }
    
    // In browser, check current location
    const { protocol, hostname, port } = window.location;
    
    // If we're on the same host and port, use same origin (both frontend and backend on same server)
    if (hostname === 'localhost' || hostname === '127.0.0.1') {
        // In development, frontend might be on 5173 and backend on 7860
        if (port === '5173') {
            return 'http://localhost:7860';
        }
        // If frontend is served from backend (port 7860), use same origin
        return `${protocol}//${hostname}:${port}`;
    }
    
    // For production, use same origin (both served from same FastAPI server)
    return `${protocol}//${hostname}${port ? `:${port}` : ''}`;
}

/**
 * Get the WebSocket URL for real-time connections
 */
export function getWebSocketBaseUrl(): string {
    if (!isBrowser) return 'ws://localhost:7860';
    
    // Check for Hugging Face Spaces
    const spaceHost = getSpaceHost();
    if (spaceHost) {
        return `wss://${spaceHost}`;
    }
    
    const { protocol, hostname, port } = window.location;
    
    // If we're on localhost
    if (hostname === 'localhost' || hostname === '127.0.0.1') {
        // In development, frontend might be on 5173 and backend on 7860
        if (port === '5173') {
            return 'ws://localhost:7860';
        }
        // If frontend is served from backend (port 7860), use same origin
        const wsProtocol = protocol === 'https:' ? 'wss:' : 'ws:';
        return `${wsProtocol}//${hostname}:${port}`;
    }
    
    // For HTTPS sites, use WSS; for HTTP sites, use WS
    const wsProtocol = protocol === 'https:' ? 'wss:' : 'ws:';
    
    // For production, use same origin (both served from same FastAPI server)
    return `${wsProtocol}//${hostname}${port ? `:${port}` : ''}`;
}

/**
 * Get environment info for debugging
 */
export function getEnvironmentInfo() {
    if (!isBrowser) return { env: 'server', hostname: 'unknown' };
    
    const { protocol, hostname, port } = window.location;
    const spaceHost = getSpaceHost();
    
    return {
        env: spaceHost ? 'huggingface-spaces' : hostname === 'localhost' ? 'local' : 'production',
        hostname,
        port,
        protocol,
        spaceHost,
        apiBaseUrl: getApiBaseUrl(),
        wsBaseUrl: getWebSocketBaseUrl()
    };
}