/**
 * PDF Field Mapper - Maps form data to PDF field names
 * Clean Code: Single Responsibility Principle
 */

/**
 * Formats a date string to DD.MM.YYYY format with leading zeros
 * @param {string} dateString - Date string (YYYY-MM-DD format)
 * @returns {string} Formatted date string (DD.MM.YYYY)
 */
function formatDateWithLeadingZeros(dateString) {
  if (!dateString) return ''
  
  try {
    const date = new Date(dateString)
    const day = String(date.getDate()).padStart(2, '0')
    const month = String(date.getMonth() + 1).padStart(2, '0')
    const year = date.getFullYear()
    return `${day}.${month}.${year}`
  } catch (error) {
    return dateString
  }
}

/**
 * Maps form data to PDF field values based on field name patterns
 * @param {Object} data - Form data
 * @param {string} fieldName - PDF field name
 * @returns {string} Mapped value
 */
export function mapFieldValue(data, fieldName) {
  const name = fieldName.toLowerCase()
  
  // Specific field mappings
  const specificMappings = {
    'sepa_mitglied': () => `${data.vorname || ''} ${data.nachname || ''}`.trim(),
    'sepa_kontoinhaber': () => data.kontoinhaber || `${data.vorname || ''} ${data.nachname || ''}`.trim(),
    'sepa_plz_ort': () => `${data.plz || ''} ${data.ort || ''}`.trim(),
    'page3_anschrift': () => `${data.strasse || ''}, ${data.plz || ''} ${data.ort || ''}`.trim(),
    'vorname': () => data.vorname || '',
    'given': () => data.vorname || '',
    'nachname': () => data.nachname || '',
    'zuname': () => data.nachname || '',
    'strasse': () => data.strasse || '',
    'straße': () => data.strasse || '',
    'street': () => data.strasse || '',
    'plz': () => data.plz || '',
    'ort': () => data.ort || '',
    'stadt': () => data.ort || '',
    'plz_ort': () => `${data.plz || ''} ${data.ort || ''}`.trim(),
    'wohnort': () => `${data.plz || ''} ${data.ort || ''}`.trim(),
    'geburtsdatum': () => formatDateWithLeadingZeros(data.geburtsdatum),
    'geb': () => formatDateWithLeadingZeros(data.geburtsdatum),
    'telefon': () => data.telefon_privat || data.telefon_mobil || '',
    'tel': () => data.telefon_privat || data.telefon_mobil || '',
    'email': () => data.email || '',
    'kontoinhaber': () => data.kontoinhaber || '',
    'kontoinh': () => data.kontoinhaber || '',
    'iban': () => data.iban || '',
    'bic': () => data.bic || '',
    'bank': () => data.bank || '',
    'kreditinstitut': () => data.bank || '',
    'mitgliedschaft': () => data.mitgliedschaftsart || '',
    'art': () => data.mitgliedschaftsart || ''
  }
  
  // Check for specific mappings first
  for (const [pattern, mapper] of Object.entries(specificMappings)) {
    if (name.includes(pattern)) {
      return mapper()
    }
  }
  
  // Special handling for PLZ/Ort combinations - more comprehensive
  if (name.includes('plz') && (name.includes('ort') || name.includes('wohnort') || name.includes('stadt'))) {
    return `${data.plz || ''} ${data.ort || ''}`.trim()
  }
  
  // Handle fields that might contain PLZ/Ort but don't explicitly mention both
  if (name.includes('plz') && !name.includes('vorname') && !name.includes('nachname') && !name.includes('strasse') && !name.includes('str')) {
    return `${data.plz || ''} ${data.ort || ''}`.trim()
  }
  
  if (name.includes('wohnort') || name.includes('ort') || name.includes('stadt')) {
    if (!name.includes('vorname') && !name.includes('nachname') && !name.includes('strasse') && !name.includes('str')) {
      return `${data.plz || ''} ${data.ort || ''}`.trim()
    }
  }
  
  // Generic name mapping (avoid conflicts with specific mappings)
  if (name.includes('name') && !name.includes('vorname') && !name.includes('given')) {
    return data.nachname || ''
  }
  
  // Date fields
  if (name.includes('datum')) {
    return data.sign_datum || data.sepa_datum || data.page3_datum || formatDateWithLeadingZeros(new Date().toISOString().split('T')[0])
  }
  
  return ''
}

/**
 * Checks if a field should be checked based on membership type
 * @param {string} fieldName - PDF field name
 * @param {string} membershipType - Membership type ('aktiv' or 'passiv')
 * @returns {boolean} Whether the field should be checked
 */
export function shouldCheckField(fieldName, membershipType) {
  const name = fieldName.toLowerCase()
  
  if (name.includes('aktiv') && membershipType === 'aktiv') {
    return true
  }
  
  if (name.includes('passiv') && membershipType === 'passiv') {
    return true
  }
  
  if (name.includes('mitglied') && name.includes(membershipType)) {
    return true
  }
  
  return false
}

/**
 * Checks if a field should be checked based on boolean value
 * @param {string} value - Value to check
 * @returns {boolean} Whether the field should be checked
 */
export function shouldCheckByValue(value) {
  const stringValue = String(value).toLowerCase()
  return stringValue === 'true' || stringValue === 'ja' || stringValue === 'checked'
}