/// Typed-item vault operations. All calls are handle-keyed — the master key
/// never crosses the WASM boundary.

import type { SessionHandle } from '../../wasm/relicario_wasm';
import type { GitHost } from './git-host';
import type { Item, ItemId, Manifest, ManifestEntry, VaultSettings } from '../shared/types';

// eslint-disable-next-line @typescript-eslint/no-explicit-any
let wasm: any = null;

// 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;
}

export interface VaultMeta {
  salt: Uint8Array;
  paramsJson: string;
}

export async function fetchVaultMeta(git: GitHost): Promise<VaultMeta> {
  const saltBytes = await git.readFile('.relicario/salt');
  const paramsRaw = await git.readFile('.relicario/params.json');
  const paramsJson = new TextDecoder().decode(paramsRaw);
  return { salt: saltBytes, paramsJson };
}

// --- Manifest ---

export async function fetchAndDecryptManifest(
  git: GitHost,
  handle: SessionHandle,
): Promise<Manifest> {
  const w = requireWasm();
  const ciphertext = await git.readFile('manifest.enc');
  return w.manifest_decrypt(handle, ciphertext) as Manifest;
}

export async function encryptAndWriteManifest(
  git: GitHost,
  handle: SessionHandle,
  manifest: Manifest,
  message: string,
): Promise<void> {
  const w = requireWasm();
  const ciphertext = w.manifest_encrypt(handle, JSON.stringify(manifest));
  await git.writeFile('manifest.enc', ciphertext, message);
}

// --- Items ---

export async function fetchAndDecryptItem(
  git: GitHost,
  handle: SessionHandle,
  id: ItemId,
): Promise<Item> {
  const w = requireWasm();
  const ciphertext = await git.readFile(`items/${id}.enc`);
  return w.item_decrypt(handle, ciphertext) as Item;
}

export async function encryptAndWriteItem(
  git: GitHost,
  handle: SessionHandle,
  id: ItemId,
  item: Item,
  message: string,
): Promise<void> {
  const w = requireWasm();
  const ciphertext = w.item_encrypt(handle, JSON.stringify(item));
  await git.writeFile(`items/${id}.enc`, ciphertext, message);
}

// --- Settings (the α subset the SW reads/writes is autofill_origin_acks) ---

export async function fetchAndDecryptSettings(
  git: GitHost,
  handle: SessionHandle,
): Promise<VaultSettings> {
  const w = requireWasm();
  const ciphertext = await git.readFile('settings.enc');
  return w.settings_decrypt(handle, ciphertext) as VaultSettings;
}

export async function encryptAndWriteSettings(
  git: GitHost,
  handle: SessionHandle,
  settings: VaultSettings,
  message: string,
): Promise<void> {
  const w = requireWasm();
  const ciphertext = w.settings_encrypt(handle, JSON.stringify(settings));
  await git.writeFile('settings.enc', ciphertext, message);
}

// --- In-memory manifest helpers ---

export function listItems(
  manifest: Manifest,
  group?: string,
): Array<[ItemId, ManifestEntry]> {
  const entries = Object.entries(manifest.items) as Array<[ItemId, ManifestEntry]>;
  // Hide trashed items from the default list view.
  const live = entries.filter(([, e]) => e.trashed_at === undefined);
  if (!group) return live;
  const g = group.toLowerCase();
  return live.filter(([, e]) => e.group?.toLowerCase() === g);
}

export function searchItems(
  manifest: Manifest,
  query: string,
): Array<[ItemId, ManifestEntry]> {
  const q = query.toLowerCase();
  return (Object.entries(manifest.items) as Array<[ItemId, ManifestEntry]>)
    .filter(([, e]) => e.trashed_at === undefined)
    .filter(([, e]) => {
      if (e.title.toLowerCase().includes(q)) return true;
      if (e.tags.some((t) => t.toLowerCase().includes(q))) return true;
      return false;
    });
}

/// Match manifest entries against a page hostname.
///
/// icon_hint is derived by the Rust core (crates/relicario-core/src/manifest.rs)
/// from LoginCore.url's hostname, so equality on icon_hint is the cheapest match.
/// α is intentionally coarse: no www.-stripping, no public-suffix matching
/// (`www.github.com` saved items will not match `github.com`, and vice versa).
/// Tighter matching is a 1C-β/γ concern.
export function findByHostname(
  manifest: Manifest,
  hostname: string,
): Array<[ItemId, ManifestEntry]> {
  const h = hostname.toLowerCase();
  return (Object.entries(manifest.items) as Array<[ItemId, ManifestEntry]>)
    .filter(([, e]) => e.trashed_at === undefined)
    .filter(([, e]) => (e.icon_hint ?? '').toLowerCase() === h);
}