import argon2 from 'argon2';
import { config } from '@config/index.js';

export async function hashPassword(password: string): Promise<string> {
  return argon2.hash(password, {
    type: argon2.argon2id,
    memoryCost: config.ARGON2_MEMORY,
    timeCost: config.ARGON2_ITERATIONS,
    parallelism: config.ARGON2_PARALLELISM,
  });
}

export async function verifyPassword(hash: string, password: string): Promise<boolean> {
  try {
    return await argon2.verify(hash, password);
  } catch {
    return false;
  }
}

export function validatePasswordStrength(password: string): { valid: boolean; errors: string[] } {
  const errors: string[] = [];

  if (password.length < 8) {
    errors.push('Password must be at least 8 characters');
  }
  if (password.length > 16) {
    errors.push('Password must not exceed 16 characters');
  }
  if (!/[A-Z]/.test(password)) {
    errors.push('Password must contain at least one uppercase letter');
  }
  if (!/[a-z]/.test(password)) {
    errors.push('Password must contain at least one lowercase letter');
  }
  if (!/[0-9]/.test(password)) {
    errors.push('Password must contain at least one number');
  }
  if (!/[!@#$%^&*()_+\-=\[\]{};':"\\|,.<>\/?]/.test(password)) {
    errors.push('Password must contain at least one special character');
  }

  return { valid: errors.length === 0, errors };
}