import { supabase } from '@/lib/supabase';

const MAX_FILE_SIZE = 20 * 1024 * 1024;
const ALLOWED_FILE_TYPES = [
  'image/jpeg',
  'image/jpg',
  'image/png',
  'image/webp',
  'image/heic',
  'image/heif',
  'image/avif',
  'image/tiff',
  'image/bmp',
];

export function validateEmail(email: string): boolean {
  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);
}

export function sanitizeInput(input: string): string {
  return input.trim().substring(0, 500);
}

export function cleanInstagramUsername(username: string): string {
  return username.trim().replace(/^@+/, '').substring(0, 30);
}

export function validateCameraFile(file: File): string | null {
  if (file.size > MAX_FILE_SIZE) {
    return 'Junwon: My database can only take photos that are smaller than 20MB 😅. Would you take a small photo by using a smartphone?';
  }

  if (!ALLOWED_FILE_TYPES.includes(file.type)) {
    return "Hmm. This file does not seem to be a photo. If it is, but you are getting this error, please send it to me on Instagram (@palacejunwon) and I'll fix the photo processing problem for everyone!";
  }

  return null;
}

export function validateFormData(formData: FormData): { valid: boolean; message?: string } {
  const email = formData.get('email')?.toString();
  const honeypot = formData.get('website')?.toString();
  const realName = formData.get('realName')?.toString();

  if (honeypot) {
    return { valid: false, message: 'Robot detected.' };
  }

  if (!realName) {
    return { valid: false, message: 'You forgot to sign the petition! 😅' };
  }

  if (!email) {
    return {
      valid: false,
      message:
        'Would you provide your email address? This ensures you can delete your submissions in the future if you ever want to.',
    };
  }

  if (!validateEmail(email)) {
    return { valid: false, message: 'I think you have a typo in your email!' };
  }

  return { valid: true };
}

export async function uploadCameraFile(file: File, signatureId: string): Promise<string | null> {
  try {
    const fileExt = file.name.split('.').pop()?.toLowerCase();
    const fileName = `${signatureId}-${Date.now()}.${fileExt}`;
    const filePath = `${fileName}`;

    const { error } = await supabase.storage.from('unesco-petition').upload(filePath, file, {
      cacheControl: '3600',
      upsert: false,
      contentType: file.type,
    });

    if (error) {
      return null;
    }

    return `/media/unesco-petition/${filePath}`;
  } catch (error) {
    return null;
  }
}

export interface SignatureData {
  email: string;
  workos_user_id?: string;
  ip_address?: string;
  user_agent?: string;
  real_name?: string;
  home_location?: string;
  instagram_username?: string;
  photo_proof_url?: string;
}

export function buildSignatureData(
  email: string,
  workosUserId: string | null,
  clientAddress: string,
  userAgent: string | null,
  realName?: string,
  location?: string,
  instagramUsername?: string
): SignatureData {
  const signatureData: SignatureData = {
    email: sanitizeInput(email).toLowerCase(),
    workos_user_id: workosUserId || undefined,
    ip_address: clientAddress,
    user_agent: userAgent || undefined,
    real_name: realName ? sanitizeInput(realName) : undefined,
  };

  if (location) {
    signatureData.home_location = sanitizeInput(location);
  }

  if (instagramUsername) {
    signatureData.instagram_username = cleanInstagramUsername(instagramUsername);
  }

  return signatureData;
}