import fs from 'node:fs';
import { requireIdentityAndRecipientId } from '../identityStore.js';
import { signedFetch, adminFetch, expectOk } from '../signedFetch.js';
import { parseEnv, serializeEnv } from '../envFormat.js';
import {
  ready,
  Identity,
  generateSymmetricKey,
  secretboxEncrypt,
  secretboxDecrypt,
  enc,
} from '../../shared/crypto.js';

export async function vaultPush(vaultKey: string, file: string, purge: boolean): Promise<void> {
  await ready();
  const { identity, recipientId } = await requireIdentityAndRecipientId();

  if (!fs.existsSync(file)) throw new Error(`file not found: ${file}`);
  const values = parseEnv(fs.readFileSync(file, 'utf8'));
  const payload = enc.fromUtf8(JSON.stringify(values));

  const existsRes = await expectOk(await signedFetch(identity, recipientId, 'GET', `/api/vaults/${encodeURIComponent(vaultKey)}/exists`));

  // recipientId -> { publicKey, canWrite } — canWrite is preserved across
  // a rotation, not reset, so pushing an update never silently changes
  // who else can write vs. only read.
  const wrapFor = new Map<string, { publicKey: string; canWrite: boolean }>();
  wrapFor.set(recipientId, { publicKey: identity.id, canWrite: true });

  if (existsRes.exists) {
    const recipientsRes = await signedFetch(identity, recipientId, 'GET', `/api/vaults/${encodeURIComponent(vaultKey)}/recipients`);
    if (!recipientsRes.ok) {
      const body = await recipientsRes.json().catch(() => ({}));
      throw new Error(body.error ?? `no access to vault '${vaultKey}' — ask an existing grantee to run 'keep grant ${vaultKey} ${recipientId}'`);
    }
    const current = await recipientsRes.json() as { recipientId: string; publicKey: string; canWrite: boolean }[];
    for (const r of current) if (r.publicKey) wrapFor.set(r.recipientId, { publicKey: r.publicKey, canWrite: r.canWrite });
  }

  const symmetricKey = generateSymmetricKey();
  const { nonce, ciphertext } = secretboxEncrypt(symmetricKey, payload);

  const wrappedKeys: Record<string, { wrappedKey: string; canWrite: boolean }> = {};
  for (const [rid, { publicKey, canWrite }] of wrapFor) {
    wrappedKeys[rid] = { wrappedKey: enc.toBase64(Identity.sealFor(publicKey, symmetricKey)), canWrite };
  }

  await expectOk(await signedFetch(identity, recipientId, 'POST', `/api/vaults/${encodeURIComponent(vaultKey)}/push`, {
    ciphertext: enc.toBase64(ciphertext),
    nonce: enc.toBase64(nonce),
    wrappedKeys,
    purge,
  }));

  console.log(`pushed '${vaultKey}' — ${Object.keys(values).length} key${Object.keys(values).length === 1 ? '' : 's'}, wrapped for ${wrapFor.size} recipient${wrapFor.size === 1 ? '' : 's'}${purge ? ' (purged previous version)' : ''}.`);
}

export async function vaultPull(vaultKey: string, format: 'env' | 'json', outFile: string | undefined, previous: boolean): Promise<void> {
  await ready();
  const { identity, recipientId } = await requireIdentityAndRecipientId();

  const query = previous ? '?previous=1' : '';
  const data = await expectOk(await signedFetch(identity, recipientId, 'GET', `/api/vaults/${encodeURIComponent(vaultKey)}/pull${query}`));

  const symmetricKey = identity.openSealed(enc.fromBase64(data.wrappedKey));
  if (!symmetricKey) throw new Error('failed to unwrap this vault\'s key — wrong identity, or the grant is stale');

  const plaintext = secretboxDecrypt(symmetricKey, enc.fromBase64(data.nonce), enc.fromBase64(data.ciphertext));
  const values = JSON.parse(enc.toUtf8(plaintext)) as Record<string, string>;

  const out = format === 'json' ? JSON.stringify(values, null, 2) : serializeEnv(values);
  if (outFile) {
    fs.writeFileSync(outFile, out);
    console.error(`wrote ${Object.keys(values).length} key(s) to ${outFile}${previous ? ' (previous version)' : ''}`);
  } else {
    process.stdout.write(out);
  }
}

export async function vaultGrant(vaultKey: string, targetRecipientId: string, readOnly: boolean): Promise<void> {
  await ready();
  const { identity, recipientId } = await requireIdentityAndRecipientId();

  const pullRes = await expectOk(await signedFetch(identity, recipientId, 'GET', `/api/vaults/${encodeURIComponent(vaultKey)}/pull`));
  const symmetricKey = identity.openSealed(enc.fromBase64(pullRes.wrappedKey));
  if (!symmetricKey) throw new Error("failed to unwrap this vault's key — can't grant access to someone else without it");

  const recipientsRes = await expectOk(await signedFetch(identity, recipientId, 'GET', '/api/recipients'));
  const target = (recipientsRes as { recipientId: string; publicKey: string }[]).find(r => r.recipientId === targetRecipientId);
  if (!target) throw new Error(`unknown recipient id: ${targetRecipientId} (ask an admin to 'keep recipient add' them first)`);

  const wrappedKey = enc.toBase64(Identity.sealFor(target.publicKey, symmetricKey));
  await expectOk(await signedFetch(identity, recipientId, 'POST', `/api/vaults/${encodeURIComponent(vaultKey)}/grant`, {
    recipientId: targetRecipientId,
    wrappedKey,
    canWrite: !readOnly,
  }));

  console.log(`granted ${readOnly ? 'read-only ' : ''}'${vaultKey}' access to ${targetRecipientId}.`);
}

export async function vaultRevoke(vaultKey: string, targetRecipientId: string): Promise<void> {
  await expectOk(await adminFetch('DELETE', `/api/admin/vaults/${encodeURIComponent(vaultKey)}/grants/${encodeURIComponent(targetRecipientId)}`));
  console.log(`revoked ${targetRecipientId}'s access to '${vaultKey}'.`);
  console.log(`Note: this stops future pulls only. If this was a compromise response, also run 'keep push ${vaultKey} --purge' with rotated values.`);
}

export async function vaultLog(vaultKey: string): Promise<void> {
  await ready();
  const { identity, recipientId } = await requireIdentityAndRecipientId();
  const entries = await expectOk(await signedFetch(identity, recipientId, 'GET', `/api/vaults/${encodeURIComponent(vaultKey)}/log`));
  if (!entries.length) { console.log('no access log entries yet.'); return; }
  for (const e of entries as { recipient_id: string; action: string; accessed_at: number }[]) {
    console.log(`${new Date(e.accessed_at * 1000).toISOString()}  ${e.action.padEnd(6)}  ${e.recipient_id}`);
  }
}