export interface ParsedBookingData {
  locationSlug: string;
  
  // Event Details
  eventDate: string;
  eventType?: string;
  guestCount?: string;
  eventLocation?: string;
  contactPerson?: string;
  contactPhone?: string;
  
  // Model & Options
  model: string;
  printOption?: string;
  accessories?: string;
  taskGame?: string;
  audioGuestbook?: string;
  delivery?: string;
  
  // Price
  calculatedPrice?: number;
  
  // Customer Data
  salutation?: string;
  companyName?: string;
  firstName?: string;
  lastName?: string;
  email: string;
  phone: string;
  
  // Address
  street?: string;
  zip?: string;
  city?: string;
  
  // Message
  message?: string;
  
  // Raw Email Data
  rawSubject: string;
  rawBody: string;
}

export class NinjaFormsEmailParser {
  private fieldMappings = {
    // Date fields
    date: ['Datum:', 'Datum'],
    
    // Event fields
    eventType: ['Art der Veranstaltung:', 'Art der Veranstaltung'],
    guestCount: ['Gästeanzahl:', 'Gästeanzahl'],
    eventLocation: ['Location:', 'Location'],
    contactPerson: ['Ansprechpartner:', 'Ansprechpartner'],
    contactPhone: ['Durchwahl:', 'Durchwahl'],
    
    // Model fields
    model: ['Modell:', 'Modell'],
    printOption: ['Vor Ort Druck?:', 'Vor Ort Druck'],
    accessories: ['Inklusive Accessiores?:', 'Inklusive Accessiores'],
    taskGame: ['Fotobox - Aufgabenspiel:', 'Aufgabenspiel'],
    audioGuestbook: ['Audio-Gästebuch:', 'Audio'],
    delivery: ['Lieferung (inkl. Auf-/Abbau):', 'Lieferung'],
    
    // Price
    price: ['Preis:', 'Preis'],
    
    // Customer fields
    salutation: ['Anrede:', 'Anrede'],
    company: ['Firma:', 'Firma'],
    firstName: ['Vorname:', 'Vorname'],
    lastName: ['Nachname:', 'Nachname'],
    email: ['E-Mail:', 'E-Mail', 'Email:'],
    phone: ['Telefon:', 'Telefon', 'Phone:'],
    
    // Address
    street: ['Straße:', 'Strasse:', 'Straße'],
    zip: ['PLZ:', 'PLZ'],
    city: ['Ort:', 'Ort'],
    
    // Message
    message: ['Nachricht:', 'Nachricht'],
  };

  parseEmailBody(body: string, subject: string): ParsedBookingData | null {
    try {
      const lines = body.split('\n').map(line => line.trim()).filter(Boolean);
      
      const data: any = {
        rawSubject: subject,
        rawBody: body,
      };

      // Detect location from subject
      data.locationSlug = this.detectLocation(subject, body);

      // Parse each line (check current and next line for key-value pairs)
      for (let i = 0; i < lines.length; i++) {
        const line = lines[i];
        const nextLine = lines[i + 1];
        
        this.parseLine(line, nextLine, data);
      }

      // Extract email and phone if not found
      if (!data.email) {
        data.email = this.extractEmail(body);
      }
      if (!data.phone) {
        data.phone = this.extractPhone(body);
      }

      // Map model names
      data.model = this.mapModelName(data.model);

      console.log('Parsed data before validation:', {
        email: data.email,
        phone: data.phone,
        eventDate: data.eventDate,
        date: data.date,
        firstName: data.firstName,
        lastName: data.lastName,
      });

      // Validate required fields
      if (!data.email || (!data.eventDate && !data.date)) {
        console.log('Validation failed: missing email or date');
        return null;
      }

      // Normalize date field
      if (data.date && !data.eventDate) {
        data.eventDate = data.date;
      }

      return data as ParsedBookingData;
    } catch (error) {
      console.error('Email parsing error:', error);
      return null;
    }
  }

  private parseLine(line: string, nextLine: string | undefined, data: any) {
    for (const [key, patterns] of Object.entries(this.fieldMappings)) {
      for (const pattern of patterns) {
        if (line.includes(pattern)) {
          // Try to get value from same line first
          let value = line.split(pattern)[1]?.trim();
          
          // If no value on same line, check next line
          if (!value && nextLine) {
            value = nextLine.trim();
          }
          
          if (value) {
            // Special handling for street - keep full address
            if (key === 'street' && value) {
              // Don't split on numbers, keep the full street name
              data[key] = value;
            } else if (key === 'price') {
              data.calculatedPrice = this.extractPrice(value);
            } else {
              data[key] = value;
            }
            return;
          }
        }
      }
    }
  }

  private detectLocation(subject: string, body: string): string {
    const text = (subject + ' ' + body).toLowerCase();
    
    if (text.includes('lübeck') || text.includes('luebeck')) return 'luebeck';
    if (text.includes('hamburg')) return 'hamburg';
    if (text.includes('kiel')) return 'kiel';
    if (text.includes('berlin') || text.includes('potsdam')) return 'berlin';
    if (text.includes('rostock')) return 'rostock';
    
    return 'luebeck'; // Default
  }

  private mapModelName(modelString?: string): string {
    if (!modelString) return 'VINTAGE_SMILE';
    
    const model = modelString.toLowerCase();
    
    if (model.includes('smile')) return 'VINTAGE_SMILE';
    if (model.includes('foto') || model.includes('photo')) return 'VINTAGE_PHOTOS';
    if (model.includes('nostalgie')) return 'NOSTALGIE';
    if (model.includes('magic') || model.includes('spiegel') || model.includes('mirror')) return 'MAGIC_MIRROR';
    
    return 'VINTAGE_SMILE';
  }

  private extractPrice(value: string): number {
    const match = value.match(/(\d+)/);
    return match ? parseInt(match[1]) : 0;
  }

  private extractEmail(text: string): string | null {
    const emailRegex = /[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/;
    const match = text.match(emailRegex);
    return match ? match[0] : null;
  }

  private extractPhone(text: string): string | null {
    const phoneRegex = /(\+?49|0)[\s\-]?(\d{2,5})[\s\-]?(\d{3,})[\s\-]?(\d{3,})/;
    const match = text.match(phoneRegex);
    return match ? match[0].replace(/\s+/g, '') : null;
  }

  parseFromNinjaFormsEmail(emailText: string, subject: string): ParsedBookingData | null {
    // Clean HTML if present
    let cleanText = emailText;
    
    // Convert HTML table rows to newlines for better parsing
    cleanText = cleanText.replace(/<\/tr>/gi, '\n');
    cleanText = cleanText.replace(/<\/td>/gi, ' ');
    cleanText = cleanText.replace(/<br\s*\/?>/gi, '\n');
    cleanText = cleanText.replace(/<\/p>/gi, '\n');
    cleanText = cleanText.replace(/<\/div>/gi, '\n');
    
    // Remove all other HTML tags
    cleanText = cleanText.replace(/<[^>]*>/g, '');
    
    // Decode HTML entities
    cleanText = cleanText
      .replace(/&nbsp;/g, ' ')
      .replace(/&amp;/g, '&')
      .replace(/&lt;/g, '<')
      .replace(/&gt;/g, '>')
      .replace(/&quot;/g, '"')
      .replace(/&#(\d+);/g, (match, dec) => String.fromCharCode(dec));
    
    // Clean up whitespace
    cleanText = cleanText
      .split('\n')
      .map(line => line.trim())
      .filter(line => line.length > 0)
      .join('\n');
    
    console.log('=== CLEANED TEXT FOR PARSING ===');
    console.log(cleanText.substring(0, 800));
    console.log('=== END CLEANED TEXT ===');
    
    const result = this.parseEmailBody(cleanText, subject);
    console.log('Parse result from parseEmailBody:', result ? 'SUCCESS' : 'FAILED');
    return result;
  }
}

export const emailParser = new NinjaFormsEmailParser();