export const API_URL =
  process.env.NEXT_PUBLIC_API_URL || 'http://localhost:3001';

// ---------------------------------------------------------------------------
// CertDetails — mirrors the API response shape from CertManagerService
// ---------------------------------------------------------------------------

export interface CertDetails {
  subject: { cn: string; o: string; ou: string; c: string };
  issuer: { cn: string; o: string; c: string };
  validity: { notBefore: string; notAfter: string; isExpired: boolean; daysLeft: number };
  san: string[];
  keyType: string;
  keyBits: number;
  serialNumber: string;
  signatureAlgorithm: string;
  fingerprint: { sha1: string; sha256: string };
  pemPreview: string;
}

// ---------------------------------------------------------------------------
// inspectCertAction — calls POST /modules/cert-manager/parse
// ---------------------------------------------------------------------------

/**
 * Call POST /modules/cert-manager/parse.
 * - If pemText is present → JSON body { pemText, password }
 * - Otherwise → multipart FormData with file + optional password
 *
 * T-09-02: password is never placed in URL, logged, or echoed.
 * T-09-04: credentials:'include' ensures JWT cookie is sent.
 */
export async function inspectCertAction(input: {
  file?: File | null;
  pemText?: string;
  password?: string;
}): Promise<CertDetails> {
  const { file, pemText, password } = input;

  if (pemText) {
    // JSON path — content-type must be application/json (not multipart)
    const response = await fetch(`${API_URL}/modules/cert-manager/parse`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ pemText, password }),
      credentials: 'include',
    });
    if (!response.ok) {
      const body = await response.text().catch(() => '');
      throw new Error(`${response.status} ${body}`.trim());
    }
    return response.json() as Promise<CertDetails>;
  } else {
    // Multipart path — let browser set Content-Type with boundary
    const form = new FormData();
    if (file) form.append('file', file);
    if (password) form.append('password', password);
    return postForm('parse', form) as Promise<CertDetails>;
  }
}

/**
 * Download a base64-encoded file as a browser download.
 * T-09-02: password is never placed in URL, console.log, or filename.
 */
export function downloadBase64(
  filename: string,
  content: string,
  mimeType: string,
): void {
  const bytes = atob(content);
  const byteArray = new Uint8Array(bytes.length);
  for (let i = 0; i < bytes.length; i++) {
    byteArray[i] = bytes.charCodeAt(i);
  }
  const blob = new Blob([byteArray], { type: mimeType });
  const url = URL.createObjectURL(blob);
  const anchor = document.createElement('a');
  anchor.href = url;
  anchor.download = filename;
  anchor.click();
  URL.revokeObjectURL(url);
}

/**
 * POST a FormData payload to a cert-manager endpoint.
 * T-09-04: credentials:'include' ensures JWT cookie is sent for ModuleGuard.
 * No manual Content-Type header — browser sets multipart boundary automatically.
 */
export async function postForm(
  endpoint: string,
  form: FormData,
): Promise<unknown> {
  const response = await fetch(
    `${API_URL}/modules/cert-manager/${endpoint}`,
    {
      method: 'POST',
      body: form,
      credentials: 'include',
    },
  );

  if (!response.ok) {
    const body = await response.text().catch(() => '');
    throw new Error(`${response.status} ${body}`.trim());
  }

  return response.json();
}