/**
 * Funções utilitárias para formatação de dados
 */

/**
 * Formata número de telefone brasileiro
 * Exemplo: 11988887777 -> (11) 98888-7777
 */
export function formatPhone(value: string): string {
  const cleaned = value.replace(/\D/g, "");

  if (cleaned.length <= 2) {
    return cleaned;
  }

  if (cleaned.length <= 6) {
    return `(${cleaned.slice(0, 2)}) ${cleaned.slice(2)}`;
  }

  if (cleaned.length <= 10) {
    return `(${cleaned.slice(0, 2)}) ${cleaned.slice(2, 6)}-${cleaned.slice(6)}`;
  }

  // Telefone com 11 dígitos (celular)
  return `(${cleaned.slice(0, 2)}) ${cleaned.slice(2, 7)}-${cleaned.slice(7, 11)}`;
}

/**
 * Formata número de telefone específico por país
 * @param phoneNumber - Número do telefone (apenas dígitos, sem código de país)
 * @param countryCode - Código ISO do país (ex: "BR", "US", "GB")
 */
function formatPhoneByCountry(
  phoneNumber: string,
  countryCode: string,
): string {
  const len = phoneNumber.length;

  switch (countryCode) {
    // Brasil: (XX) XXXXX-XXXX ou (XX) XXXX-XXXX
    case "BR":
      if (len <= 2) return phoneNumber;
      if (len <= 6)
        return `(${phoneNumber.slice(0, 2)}) ${phoneNumber.slice(2)}`;
      if (len <= 10)
        return `(${phoneNumber.slice(0, 2)}) ${phoneNumber.slice(2, 6)}-${phoneNumber.slice(6)}`;
      return `(${phoneNumber.slice(0, 2)}) ${phoneNumber.slice(2, 7)}-${phoneNumber.slice(7, 11)}`;

    // EUA/Canadá: (XXX) XXX-XXXX
    case "US":
    case "CA":
      if (len <= 3) return phoneNumber;
      if (len <= 6)
        return `(${phoneNumber.slice(0, 3)}) ${phoneNumber.slice(3)}`;
      return `(${phoneNumber.slice(0, 3)}) ${phoneNumber.slice(3, 6)}-${phoneNumber.slice(6, 10)}`;

    // México: (XX) XXXX XXXX
    case "MX":
      if (len <= 2) return phoneNumber;
      if (len <= 6)
        return `(${phoneNumber.slice(0, 2)}) ${phoneNumber.slice(2)}`;
      return `(${phoneNumber.slice(0, 2)}) ${phoneNumber.slice(2, 6)} ${phoneNumber.slice(6, 10)}`;

    // Argentina: (XX) XXXX-XXXX
    case "AR":
      if (len <= 2) return phoneNumber;
      if (len <= 6)
        return `(${phoneNumber.slice(0, 2)}) ${phoneNumber.slice(2)}`;
      return `(${phoneNumber.slice(0, 2)}) ${phoneNumber.slice(2, 6)}-${phoneNumber.slice(6, 10)}`;

    // Chile: X XXXX XXXX
    case "CL":
      if (len <= 1) return phoneNumber;
      if (len <= 5) return `${phoneNumber.slice(0, 1)} ${phoneNumber.slice(1)}`;
      return `${phoneNumber.slice(0, 1)} ${phoneNumber.slice(1, 5)} ${phoneNumber.slice(5, 9)}`;

    // Colômbia: XXX XXX XXXX
    case "CO":
      if (len <= 3) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)} ${phoneNumber.slice(6, 10)}`;

    // Peru: XXX XXX XXX
    case "PE":
      if (len <= 3) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)} ${phoneNumber.slice(6, 9)}`;

    // Portugal: XXX XXX XXX
    case "PT":
      if (len <= 3) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)} ${phoneNumber.slice(6, 9)}`;

    // Espanha: XXX XXX XXX
    case "ES":
      if (len <= 3) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)} ${phoneNumber.slice(6, 9)}`;

    // Reino Unido: XXXX XXX XXXX
    case "GB":
      if (len <= 4) return phoneNumber;
      if (len <= 7) return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4)}`;
      return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4, 7)} ${phoneNumber.slice(7, 11)}`;

    // França: XX XX XX XX XX
    case "FR": {
      if (len <= 2) return phoneNumber;
      const groups: string[] = [];
      for (let i = 0; i < len; i += 2) {
        if (i + 2 <= len) {
          groups.push(phoneNumber.slice(i, i + 2));
        } else {
          groups.push(phoneNumber.slice(i));
        }
      }
      return groups.join(" ");
    }

    // Alemanha: XXXX XXXXXXX
    case "DE":
      if (len <= 4) return phoneNumber;
      return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4)}`;

    // Itália: XXX XXX XXXX
    case "IT":
      if (len <= 3) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)} ${phoneNumber.slice(6, 10)}`;

    // Holanda: XX XXXXXXXX
    case "NL":
      if (len <= 2) return phoneNumber;
      return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2)}`;

    // Bélgica: XXXX XX XX XX
    case "BE":
      if (len <= 4) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4)}`;
      if (len <= 8)
        return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4, 6)} ${phoneNumber.slice(6)}`;
      return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4, 6)} ${phoneNumber.slice(6, 8)} ${phoneNumber.slice(8)}`;

    // Suíça: XX XXX XX XX
    case "CH":
      if (len <= 2) return phoneNumber;
      if (len <= 5) return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2)}`;
      if (len <= 7)
        return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2, 5)} ${phoneNumber.slice(5)}`;
      return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2, 5)} ${phoneNumber.slice(5, 7)} ${phoneNumber.slice(7)}`;

    // Áustria: XXXX XXXX
    case "AT":
      if (len <= 4) return phoneNumber;
      return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4, 8)}`;

    // Polônia: XXX XXX XXX
    case "PL":
      if (len <= 3) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)} ${phoneNumber.slice(6, 9)}`;

    // Rússia: XXX XXX-XX-XX
    case "RU":
      if (len <= 3) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      if (len <= 8)
        return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)}-${phoneNumber.slice(6)}`;
      return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)}-${phoneNumber.slice(6, 8)}-${phoneNumber.slice(8)}`;

    // China: XXX XXXX XXXX
    case "CN":
      if (len <= 3) return phoneNumber;
      if (len <= 7) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 7)} ${phoneNumber.slice(7, 11)}`;

    // Japão: XX-XXXX-XXXX
    case "JP":
      if (len <= 2) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 2)}-${phoneNumber.slice(2)}`;
      return `${phoneNumber.slice(0, 2)}-${phoneNumber.slice(2, 6)}-${phoneNumber.slice(6, 10)}`;

    // Coreia do Sul: XXX-XXXX-XXXX
    case "KR":
      if (len <= 3) return phoneNumber;
      if (len <= 7) return `${phoneNumber.slice(0, 3)}-${phoneNumber.slice(3)}`;
      return `${phoneNumber.slice(0, 3)}-${phoneNumber.slice(3, 7)}-${phoneNumber.slice(7, 11)}`;

    // Índia: XXXX XXX XXX
    case "IN":
      if (len <= 4) return phoneNumber;
      if (len <= 7) return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4)}`;
      return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4, 7)} ${phoneNumber.slice(7, 10)}`;

    // Austrália: XXXX XXX XXX
    case "AU":
      if (len <= 4) return phoneNumber;
      if (len <= 7) return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4)}`;
      return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4, 7)} ${phoneNumber.slice(7, 10)}`;

    // Nova Zelândia: XXXX XXX XXX
    case "NZ":
      if (len <= 4) return phoneNumber;
      if (len <= 7) return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4)}`;
      return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4, 7)} ${phoneNumber.slice(7, 10)}`;

    // África do Sul: XX XXX XXXX
    case "ZA":
      if (len <= 2) return phoneNumber;
      if (len <= 5) return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2)}`;
      return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2, 5)} ${phoneNumber.slice(5, 9)}`;

    // Turquia: XXX XXX XX XX
    case "TR":
      if (len <= 3) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      if (len <= 8)
        return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)} ${phoneNumber.slice(6)}`;
      return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)} ${phoneNumber.slice(6, 8)} ${phoneNumber.slice(8)}`;

    // Arábia Saudita: XX XXX XXXX
    case "SA":
      if (len <= 2) return phoneNumber;
      if (len <= 5) return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2)}`;
      return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2, 5)} ${phoneNumber.slice(5, 9)}`;

    // Emirados Árabes: XX XXX XXXX
    case "AE":
      if (len <= 2) return phoneNumber;
      if (len <= 5) return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2)}`;
      return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2, 5)} ${phoneNumber.slice(5, 9)}`;

    // Israel: XX-XXX-XXXX
    case "IL":
      if (len <= 2) return phoneNumber;
      if (len <= 5) return `${phoneNumber.slice(0, 2)}-${phoneNumber.slice(2)}`;
      return `${phoneNumber.slice(0, 2)}-${phoneNumber.slice(2, 5)}-${phoneNumber.slice(5, 9)}`;

    // Uruguai: XXXX XXXX
    case "UY":
      if (len <= 4) return phoneNumber;
      return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4, 8)}`;

    // Paraguai: XXX XXX XXX
    case "PY":
      if (len <= 3) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)} ${phoneNumber.slice(6, 9)}`;

    // Bolívia: XXXX XXXX
    case "BO":
      if (len <= 4) return phoneNumber;
      return `${phoneNumber.slice(0, 4)} ${phoneNumber.slice(4, 8)}`;

    // Venezuela: XXXX-XXXXXXX
    case "VE":
      if (len <= 4) return phoneNumber;
      return `${phoneNumber.slice(0, 4)}-${phoneNumber.slice(4)}`;

    // Equador: XX XXX XXXX
    case "EC":
      if (len <= 2) return phoneNumber;
      if (len <= 5) return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2)}`;
      return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2, 5)} ${phoneNumber.slice(5, 9)}`;

    // Egito: XX XXXX XXXX
    case "EG":
      if (len <= 2) return phoneNumber;
      if (len <= 6) return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2)}`;
      return `${phoneNumber.slice(0, 2)} ${phoneNumber.slice(2, 6)} ${phoneNumber.slice(6, 10)}`;

    // Formatação genérica padrão (espaços a cada 3-4 dígitos)
    default: {
      if (len <= 4) return phoneNumber;
      if (len <= 7) return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3)}`;
      if (len <= 10)
        return `${phoneNumber.slice(0, 3)} ${phoneNumber.slice(3, 6)} ${phoneNumber.slice(6)}`;

      // Para números maiores, agrupa em grupos de 3-4 dígitos
      const groups: string[] = [];
      let remaining = phoneNumber;

      while (remaining.length > 4) {
        groups.push(remaining.slice(0, 3));
        remaining = remaining.slice(3);
      }

      if (remaining.length > 0) {
        groups.push(remaining);
      }

      return groups.join(" ");
    }
  }
}

/**
 * Gera um placeholder de telefone baseado no formato do país
 * @param countryCode - Código ISO do país (ex: "BR", "US", "GB")
 * @returns Placeholder formatado (ex: "(11) 98888-7777")
 */
export function getPhonePlaceholder(countryCode: string): string {
  // Números exemplo para cada país (apenas para mostrar o formato)
  const examples: Record<string, string> = {
    BR: "(11) 98888-7777",
    US: "(415) 555-1234",
    CA: "(416) 555-1234",
    MX: "(55) 1234 5678",
    AR: "(11) 1234-5678",
    CL: "9 1234 5678",
    CO: "300 123 4567",
    PE: "987 654 321",
    PT: "912 345 678",
    ES: "612 345 678",
    GB: "7123 456 789",
    FR: "61 23 45 67 89",
    DE: "3012 3456789",
    IT: "321 234 5678",
    NL: "61 23456789",
    BE: "1234 56 78 90",
    CH: "21 321 45 67",
    AT: "1234 5678",
    PL: "123 456 789",
    RU: "495 123-45-67",
    CN: "138 1234 5678",
    JP: "90-1234-5678",
    KR: "010-1234-5678",
    IN: "9876 543 210",
    AU: "0412 345 678",
    NZ: "021 234 5678",
    ZA: "82 123 4567",
    TR: "532 123 45 67",
    SA: "50 123 4567",
    AE: "50 123 4567",
    IL: "50-123-4567",
    UY: "1234 5678",
    PY: "981 234 567",
    BO: "7123 4567",
    VE: "2126-1234567",
    EC: "99 123 4567",
    EG: "10 1234 5678",
  };

  return examples[countryCode] || "123 456 7890";
}

/**
 * Formata número de telefone internacional com código de país
 * @param value - Número do telefone (com ou sem código de país)
 * @param dialCode - Código de discagem internacional (ex: "+55")
 * @param countryCode - Código ISO do país (ex: "BR")
 */
export function formatInternationalPhone(
  value: string,
  dialCode: string,
  countryCode?: string,
): string {
  const cleaned = value.replace(/\D/g, "");

  // Remove o código de país se já estiver presente
  let phoneNumber = cleaned;
  const dialCodeDigits = dialCode.replace(/\D/g, "");

  if (phoneNumber.startsWith(dialCodeDigits)) {
    phoneNumber = phoneNumber.slice(dialCodeDigits.length);
  }

  // Se não temos código de país, usar formatação genérica
  if (!countryCode) {
    return formatPhoneByCountry(phoneNumber, "DEFAULT");
  }

  // Aplicar formatação específica do país
  return formatPhoneByCountry(phoneNumber, countryCode);
}

/**
 * Remove formatação do telefone
 * Exemplo: (11) 98888-7777 -> 11988887777
 */
export function unformatPhone(value: string): string {
  return value.replace(/\D/g, "");
}

/**
 * Combina código de país com número de telefone
 * @param dialCode - Código de discagem (ex: "+55")
 * @param phoneNumber - Número do telefone (sem código)
 */
export function combinePhoneWithDialCode(
  dialCode: string,
  phoneNumber: string,
): string {
  const cleanedPhone = unformatPhone(phoneNumber);
  const cleanedDialCode = dialCode.replace(/\D/g, "");

  // Remove código de país se já estiver presente
  if (cleanedPhone.startsWith(cleanedDialCode)) {
    return `${dialCode}${cleanedPhone.slice(cleanedDialCode.length)}`;
  }

  return `${dialCode}${cleanedPhone}`;
}

/**
 * Calcula a força da senha
 * Retorna: 'weak' | 'medium' | 'strong'
 */
export function checkPasswordStrength(
  password: string,
): "weak" | "medium" | "strong" {
  if (password.length < 8) {
    return "weak";
  }

  let strength = 0;

  // Verificar requisitos básicos
  if (password.length >= 8) strength++;
  if (password.length >= 12) strength++;
  if (/[a-z]/.test(password)) strength++;
  if (/[A-Z]/.test(password)) strength++;
  if (/[0-9]/.test(password)) strength++;
  if (/[^a-zA-Z0-9]/.test(password)) strength++; // Caracteres especiais

  if (strength <= 3) {
    return "weak";
  } else if (strength <= 5) {
    return "medium";
  } else {
    return "strong";
  }
}

/**
 * Valida se a senha atende aos requisitos mínimos
 */
export function validatePasswordRequirements(password: string): {
  isValid: boolean;
  errors: string[];
} {
  const errors: string[] = [];

  if (password.length < 8) {
    errors.push("Senha deve ter no mínimo 8 caracteres");
  }

  if (!/[A-Z]/.test(password)) {
    errors.push("Senha deve conter pelo menos 1 letra maiúscula");
  }

  if (!/[a-z]/.test(password)) {
    errors.push("Senha deve conter pelo menos 1 letra minúscula");
  }

  if (!/[0-9]/.test(password)) {
    errors.push("Senha deve conter pelo menos 1 número");
  }

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

/**
 * Mapeia o locale da aplicação (ex: "pt", "en") para um BCP 47 válido
 * para APIs de formatação (ex: "pt-BR", "en-US").
 */
export function resolveBCP47Locale(locale?: string): string {
  switch (locale) {
    case "pt":
      return "pt-BR";
    case "en":
      return "en-US";
    default:
      // Fallback consistente para evitar divergência SSR/cliente
      return "pt-BR";
  }
}

/**
 * Formata números com locale consistente, evitando mismatch de hidratação
 * entre SSR e cliente.
 */
export function formatNumber(value: number, locale?: string): string {
  try {
    return value.toLocaleString(resolveBCP47Locale(locale));
  } catch {
    return String(value);
  }
}