/**
 * Profile Helper Utility
 *
 * Standardized profile loading for all numerology tools.
 * Import this to add profile support with just a few lines.
 *
 * Usage:
 *   import { parseProfileOrDirect } from './profile-helper';
 *
 *   const { name, birthdate } = parseProfileOrDirect(args, {
 *     toolName: 'optimal-days',
 *     requiresBirthdate: true,
 *     requiresName: false
 *   });
 */

import { loadProfile } from './profile-manager';

export interface ParseOptions {
  toolName: string;
  requiresBirthdate?: boolean;
  requiresName?: boolean;
}

export interface ParsedData {
  name: string;
  birthdate: string;
}

/**
 * Parse command line args for either --profile or direct --name/--birthdate
 *
 * @param args - process.argv.slice(2)
 * @param options - Configuration options
 * @returns Object with name and birthdate
 * @throws Error if required data is missing
 */
export function parseProfileOrDirect(args: string[], options: ParseOptions): ParsedData {
  let name = '';
  let birthdate = '';
  let profileId = '';

  // Parse arguments
  for (let i = 0; i < args.length; i++) {
    if ((args[i] === '--profile' || args[i] === '-p') && args[i + 1]) {
      profileId = args[i + 1];
      i++;
    } else if ((args[i] === '--name' || args[i] === '-n') && args[i + 1]) {
      name = args[i + 1];
      i++;
    } else if ((args[i] === '--birthdate' || args[i] === '-b') && args[i + 1]) {
      birthdate = args[i + 1];
      i++;
    }
  }

  // Load profile if specified
  if (profileId) {
    const profile = loadProfile(profileId);

    if (!profile) {
      console.error(`Error: Profile '${profileId}' not found`);
      console.error('List profiles with: bun profile.ts list');
      process.exit(1);
    }

    name = profile.name;
    birthdate = profile.birthdate;
    console.log(`Using profile '${profileId}': ${name} (${birthdate})`);
  }

  // Validate required fields
  const requiresName = options.requiresName !== false; // default true
  const requiresBirthdate = options.requiresBirthdate !== false; // default true

  if (requiresName && !name) {
    console.error(`Error: ${options.toolName} requires --name (or --profile)`);
    console.error('Try: bun --help');
    process.exit(1);
  }

  if (requiresBirthdate && !birthdate) {
    console.error(`Error: ${options.toolName} requires --birthdate (or --profile)`);
    console.error('Try: bun --help');
    process.exit(1);
  }

  return { name, birthdate };
}

/**
 * Add profile flag to help text
 *
 * @param existingHelp - Existing help text with --name and --birthdate
 * @returns Updated help text with --profile option
 */
export function addProfileToHelp(existingHelp: string): string {
  // Add profile option to OPTIONS section
  let updated = existingHelp.replace(
    /(OPTIONS:|Options:)\s*\n/i,
    '$1\n  -p, --profile ID      Use saved profile\n'
  );

  // Update required flags to say "or --profile"
  updated = updated.replace(
    /(\s+--name.*)\[required\]/gi,
    '$1[required if no profile]'
  );
  updated = updated.replace(
    /(\s+--birthdate.*)\[required\]/gi,
    '$1[required if no profile]'
  );

  // Add profile example
  if (updated.includes('EXAMPLES:') || updated.includes('Examples:')) {
    updated = updated.replace(
      /(EXAMPLES?:.*?\n)/i,
      '$1  # With profile\n  bun <tool>.ts --profile john\n\n'
    );
  }

  return updated;
}