/// Vault operations module.
///
/// Bridges the WASM crypto functions with the git host API to provide
/// high-level vault operations: fetch/decrypt manifest, fetch/decrypt entries,
/// encrypt/write entries, search, and URL matching.

import type { GitHost } from './git-host';
import type { Entry, Manifest, ManifestEntry } from '../shared/types';

// WASM module reference — set once during init.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
let wasm: any = null;

/// Store the WASM module reference after initialization.
// eslint-disable-next-line @typescript-eslint/no-explicit-any
export function setWasm(w: any): void {
  wasm = w;
}

function requireWasm(): any {
  if (!wasm) throw new Error('WASM module not initialized');
  return wasm;
}

/// Vault metadata: salt and KDF params stored unencrypted in the repo.
export interface VaultMeta {
  salt: Uint8Array;
  paramsJson: string;
}

/// Read the vault salt and KDF params from the git repo.
export async function fetchVaultMeta(git: GitHost): Promise<VaultMeta> {
  const saltBytes = await git.readFile('.idfoto/salt');
  const paramsRaw = await git.readFile('.idfoto/params.json');
  const paramsJson = new TextDecoder().decode(paramsRaw);
  return { salt: saltBytes, paramsJson };
}

/// Fetch and decrypt the manifest from the git repo.
export async function fetchAndDecryptManifest(
  git: GitHost,
  masterKey: Uint8Array,
): Promise<Manifest> {
  const w = requireWasm();
  const ciphertext = await git.readFile('manifest.enc');
  const json = w.decrypt_manifest(ciphertext, masterKey);
  return JSON.parse(json) as Manifest;
}

/// Fetch and decrypt a single entry from the git repo.
export async function fetchAndDecryptEntry(
  git: GitHost,
  masterKey: Uint8Array,
  id: string,
): Promise<Entry> {
  const w = requireWasm();
  const ciphertext = await git.readFile(`entries/${id}.enc`);
  const json = w.decrypt_entry(ciphertext, masterKey);
  return JSON.parse(json) as Entry;
}

/// Encrypt an entry and write it to the git repo.
export async function encryptAndWriteEntry(
  git: GitHost,
  masterKey: Uint8Array,
  id: string,
  entry: Entry,
  message: string,
): Promise<void> {
  const w = requireWasm();
  const entryJson = JSON.stringify(entry);
  const ciphertext = w.encrypt_entry(entryJson, masterKey);
  await git.writeFile(`entries/${id}.enc`, ciphertext, message);
}

/// Encrypt the manifest and write it to the git repo.
export async function encryptAndWriteManifest(
  git: GitHost,
  masterKey: Uint8Array,
  manifest: Manifest,
  message: string,
): Promise<void> {
  const w = requireWasm();
  const manifestJson = JSON.stringify(manifest);
  const ciphertext = w.encrypt_manifest(manifestJson, masterKey);
  await git.writeFile('manifest.enc', ciphertext, message);
}

/// Filter manifest entries by group (case-insensitive). If no group given, returns all.
export function listEntries(
  manifest: Manifest,
  group?: string,
): Array<[string, ManifestEntry]> {
  const entries = Object.entries(manifest.entries);
  if (!group) return entries;
  const g = group.toLowerCase();
  return entries.filter(([, e]) =>
    e.group?.toLowerCase() === g
  );
}

/// Case-insensitive substring search on name, url, and username.
export function searchEntries(
  manifest: Manifest,
  query: string,
): Array<[string, ManifestEntry]> {
  const q = query.toLowerCase();
  return Object.entries(manifest.entries).filter(([, e]) => {
    if (e.name.toLowerCase().includes(q)) return true;
    if (e.url?.toLowerCase().includes(q)) return true;
    if (e.username?.toLowerCase().includes(q)) return true;
    return false;
  });
}

/// Find entries whose URL matches the given page URL by hostname.
export function findByUrl(
  manifest: Manifest,
  url: string,
): Array<[string, ManifestEntry]> {
  let hostname: string;
  try {
    hostname = new URL(url).hostname;
  } catch {
    return [];
  }

  return Object.entries(manifest.entries).filter(([, e]) => {
    if (!e.url) return false;
    try {
      const entryHost = new URL(e.url).hostname;
      return entryHost === hostname;
    } catch {
      return false;
    }
  });
}