// Beta helper: ask WFDASH whether the invoice photo matches what the driver
// collected on a PO. Advisory only — nothing here writes to PocketBase or
// changes how collecting works. Off unless the driver switches it on in
// Settings.

import { pb, getSettings } from './pocketbase';

export type Verdict = 'green' | 'amber' | 'red' | 'unchecked';

export interface CheckedLine {
  id: string;
  kind: 'customer' | 'stock';
  description: string;
  qty_collected: number;
  verdict: Verdict;
  reason: string;
}

export interface InvoiceCheckResult {
  po_number: string;
  lines: CheckedLine[];
  all_green: boolean;
  error: string;
}

/** The WFDASH address to call, or '' when the helper is off or not set up. */
export function invoiceCheckBase(): string {
  const s = getSettings();
  if (!s.aiCheckEnabled) return '';
  const url = (s.aiCheckUrl || process.env.NEXT_PUBLIC_WFDASH_URL || '').trim();
  return url.replace(/\/+$/, '');
}

export async function checkInvoice(poNumber: string): Promise<InvoiceCheckResult> {
  const base = invoiceCheckBase();
  if (!base) throw new Error('Invoice check is not set up (Settings → Beta).');
  const res = await fetch(`${base}/api/v1/driver/collection-check`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${pb.authStore.token}` },
    body: JSON.stringify({ po_number: poNumber }),
    signal: AbortSignal.timeout(120_000),
  });
  const body = await res.json().catch(() => ({}));
  if (!res.ok) throw new Error(body.error || `Check failed (${res.status})`);
  return body as InvoiceCheckResult;
}

// Remembered per PO on this device: the driver looked at the result and
// carried on. Purely a note for the driver; it blocks and unlocks nothing.
const SEEN_KEY = 'wfdash-driver:invoice-check-seen';

export function readSeen(): Record<string, 'ok' | 'override'> {
  try {
    return JSON.parse(localStorage.getItem(SEEN_KEY) || '{}');
  } catch {
    return {};
  }
}

export function rememberSeen(poNumber: string, how: 'ok' | 'override') {
  try {
    localStorage.setItem(SEEN_KEY, JSON.stringify({ ...readSeen(), [poNumber]: how }));
  } catch {
    // Storage unavailable: the note is optional.
  }
}