import * as crypto from 'crypto';

export function parseRecordURI(uri: string): { did: string; collection: string; rkey: string } {
  const match = uri.match(/^at:\/\/(did:[^\/]+)\/([^\/]+)\/(.+)$/);
  if (!match) {
    throw new Error('Invalid AT Protocol URI format. Expected: at://did:plc:xxx/collection/rkey');
  }
  
  return {
    did: match[1]!,
    collection: match[2]!,
    rkey: match[3]!
  };
}

// Recursively sort object keys for deterministic hashing
function sortObject(obj: any): any {
  if (obj === null || typeof obj !== 'object' || Array.isArray(obj)) {
    return obj;
  }
  
  const sorted: any = {};
  Object.keys(obj)
    .sort()
    .forEach(key => {
      sorted[key] = sortObject(obj[key]);
    });
  
  return sorted;
}

export function hashContent(content: any): string {
  // Sort keys for deterministic hashing
  const sortedContent = sortObject(content);
  const jsonString = JSON.stringify(sortedContent);
  return '0x' + crypto.createHash('sha256').update(jsonString).digest('hex');
}

export function getExplorerURL(attestationUID: string, network: string = 'sepolia'): string {
  const explorers: Record<string, string> = {
    'sepolia': 'https://sepolia.easscan.org',
    'base-sepolia': 'https://base-sepolia.easscan.org',
    'base': 'https://base.easscan.org',
    'optimism': 'https://optimism.easscan.org',
    'arbitrum': 'https://arbitrum.easscan.org',
  };
  
  const baseURL = explorers[network] || explorers['sepolia'];
  return `${baseURL}/attestation/view/${attestationUID}`;
}