import crypto from 'crypto'

export async function uploadToOpeninary(file: File, folder: string = "marmarislocal"): Promise<string> {
  const baseUrl = process.env.OPENINARY_API_URL?.replace(/\/+$/, '');
  const url = `${baseUrl}/api/upload`;
  const key = process.env.OPENINARY_API_KEY;

  if (!baseUrl || !key) {
    throw new Error("Openinary configuration (OPENINARY_API_URL or OPENINARY_API_KEY) is missing in environment variables.");
  }

  // 1. ENAMETOOLONG Fix: Shorten very long folder parts (e.g. slugs)
  const safeFolder = folder
    .split('/')
    .filter(Boolean) // Avoid double slashes in folder path
    .map(part => {
      if (part.length > 25) {
        const hash = crypto.createHash('md5').update(part).digest('hex').substring(0, 5);
        return `${part.substring(0, 20)}-${hash}`;
      }
      return part;
    })
    .join('/');

  // 2. ENAMETOOLONG Fix: Shorten very long filenames
  const lastDotIndex = file.name.lastIndexOf('.');
  const ext = lastDotIndex !== -1 ? file.name.substring(lastDotIndex) : '';
  let nameWithoutExt = lastDotIndex !== -1 ? file.name.substring(0, lastDotIndex) : file.name;
  
  if (nameWithoutExt.length > 25) {
    const hash = crypto.createHash('md5').update(nameWithoutExt).digest('hex').substring(0, 5);
    nameWithoutExt = `${nameWithoutExt.substring(0, 20)}-${hash}`;
  }
  const safeFileName = `${nameWithoutExt}${ext}`;

  const formData = new FormData();
  formData.append("files", file, safeFileName);
  formData.append("folder", safeFolder);

  const response = await fetch(url, {
    method: "POST",
    headers: {
      "Authorization": `Bearer ${key}`,
    },
    body: formData,
  });

  if (!response.ok) {
    const errText = await response.text();
    throw new Error(`Openinary upload failed: ${response.statusText} - ${errText}`);
  }

  const data = await response.json();
  
  // Openinary standard response is usually an array: [{ url: "...", name: "..." }]
  if (Array.isArray(data) && data.length > 0) {
    const fileUrl = data[0].url || data[0].secure_url;
    return fileUrl.startsWith('/') ? `${baseUrl}${fileUrl}` : fileUrl;
  } else if (data && typeof data === "object") {
    const fileUrl = data.url || data.secure_url || (data.files && data.files[0]?.url);
    return fileUrl.startsWith('/') ? `${baseUrl}${fileUrl}` : fileUrl;
  }

  throw new Error("Invalid response format from Openinary server.");
}