// Thin API client for the operator/admin UI.
//
// Auth is cookie-based: the JWT lives in an HttpOnly cookie the browser sends
// automatically (credentials: 'include'). For mutations we echo the readable
// CSRF cookie back in the X-CSRF-Token header (double-submit). See
// wiki/entities/local-jwt-auth.md.

import { logFailedRequest } from "./lib/logger.js";
import { apiUrl } from "./lib/origin.js";
import type { AppLogRecord } from "@parking/shared";

const CSRF_COOKIE = "parking_csrf";
const CSRF_HEADER = "X-CSRF-Token";

function readCookie(name: string): string | null {
  const m = document.cookie.match(new RegExp(`(?:^|; )${name}=([^;]*)`));
  return m ? decodeURIComponent(m[1]!) : null;
}

/** fetch wrapper: sends cookies, adds CSRF header on mutations, parses errors. */
export async function apiFetch<T>(path: string, init: RequestInit = {}): Promise<T> {
  const method = (init.method ?? "GET").toUpperCase();
  const headers = new Headers(init.headers);
  if (init.body && !headers.has("content-type")) {
    headers.set("content-type", "application/json");
  }
  if (method !== "GET" && method !== "HEAD") {
    const csrf = readCookie(CSRF_COOKIE);
    if (csrf) headers.set(CSRF_HEADER, csrf);
  }
  const res = await fetch(apiUrl(path), { ...init, headers, credentials: "include" });
  if (!res.ok) {
    const msg = (await res.json().catch(() => ({}))) as { error?: string; problems?: string[]; [k: string]: unknown };
    const error = msg.error ?? `${path}: ${res.status}`;
    // Ship the failed request to the backend log store (best-effort, loop-safe — the
    // logger itself never logs the /api/logs call). 401s are normal pre-login churn,
    // so we don't report them as errors. See lib/logger.ts.
    if (res.status !== 401) {
      logFailedRequest({ path, method, status: res.status, error });
    }
    throw new ApiError(error, res.status, msg.problems, msg);
  }
  if (res.status === 204) return undefined as T;
  return res.json() as Promise<T>;
}

export class ApiError extends Error {
  constructor(
    message: string,
    readonly status: number,
    /** Field-level problems from a validation error (e.g. tariff publish), if any. */
    readonly problems?: string[],
    /** The full parsed error body, for callers that need extra fields (e.g. a booth
     *  exit's plate-swap detail: { status, plate, otherIdentity, otherEnteredAt }). */
    readonly body?: Record<string, unknown>,
  ) {
    super(message);
  }
}

// --- Auth -----------------------------------------------------------------

export type Lang = "sq" | "en";
export type Theme = "dark" | "light";
/** A `resource:action` permission string (the server is the source of truth for
 *  the full grid; the role composer fetches it via /api/roles). */
export type Permission = string;
export interface SessionUser {
  id: string;
  username: string;
  roleId: string;
  roleName: string;
  /** The permissions this user's role grants — the UI gates nav/routes on these. */
  permissions: Permission[];
  /** Preferred UI language (loaded from the server on login). */
  language: Lang;
  /** Preferred UI theme (loaded from the server on login). */
  theme: Theme;
  /** Preferred UI font scale, percent of base (100 = base; clamped 80–160). */
  fontScale: number;
  /** Optional display name (profile metadata); null if unset. */
  fullName: string | null;
  /** Optional contact email (profile metadata); null if unset. */
  email: string | null;
}

/** Does this session grant the permission? Central authz check for the SPA. */
export function can(user: SessionUser | null, perm: Permission): boolean {
  return !!user && user.permissions.includes(perm);
}

export function login(username: string, password: string): Promise<SessionUser> {
  return apiFetch<SessionUser>("/api/auth/login", {
    method: "POST",
    body: JSON.stringify({ username, password }),
  });
}

export function logout(): Promise<{ ok: boolean }> {
  return apiFetch("/api/auth/logout", { method: "POST" });
}

/** Persist the current user's UI language preference (restored on next login). */
export function setLanguagePref(language: Lang): Promise<{ language: Lang }> {
  return apiFetch("/api/auth/language", { method: "PUT", body: JSON.stringify({ language }) });
}

/** Persist the current user's UI theme preference (restored on next login). */
export function setThemePref(theme: Theme): Promise<{ theme: Theme }> {
  return apiFetch("/api/auth/theme", { method: "PUT", body: JSON.stringify({ theme }) });
}

/** Allowed font-scale band (percent of base) + step. The header control clamps to these. */
export const FONT_SCALE_MIN = 80;
export const FONT_SCALE_MAX = 160;
export const FONT_SCALE_STEP = 10;

/** Persist the current user's UI font scale (percent; restored on next login). */
export function setFontScalePref(fontScale: number): Promise<{ fontScale: number }> {
  return apiFetch("/api/auth/font-scale", { method: "PUT", body: JSON.stringify({ fontScale }) });
}

/** Edit MY own profile (display name / email). Returns the refreshed session.
 *  Self-service — touches only the signed-in user; no `user:*` permission needed. */
export function updateMyProfile(patch: {
  fullName?: string | null;
  email?: string | null;
}): Promise<SessionUser> {
  return apiFetch<SessionUser>("/api/auth/profile", {
    method: "PUT",
    body: JSON.stringify(patch),
  });
}

/** Change MY own password — proves the current one first (server enforces). */
export function changeMyPassword(
  currentPassword: string,
  newPassword: string,
): Promise<{ ok: boolean }> {
  return apiFetch("/api/auth/password", {
    method: "PUT",
    body: JSON.stringify({ currentPassword, newPassword }),
  });
}

/** Returns the current user, or null if not authenticated. */
export async function fetchMe(): Promise<SessionUser | null> {
  try {
    return await apiFetch<SessionUser>("/api/auth/me");
  } catch (e) {
    if (e instanceof ApiError && (e.status === 401 || e.status === 403)) return null;
    throw e;
  }
}

// --- User & role management (RBAC) ----------------------------------------

/** Optional profile metadata on a managed user (all nullable). */
export interface UserProfile {
  fullName: string | null;
  phone: string | null;
  email: string | null;
  address: string | null;
}
export interface ManagedUser extends UserProfile {
  id: string;
  username: string;
  roleId: string;
  roleName: string;
  language: Lang;
  createdAt: string;
}
export interface ManagedRole {
  id: string;
  name: string;
  builtin: boolean;
  permissions: Permission[];
  userCount: number;
}

export function fetchUsers(): Promise<{ users: ManagedUser[] }> {
  return apiFetch("/api/users");
}
export function createUser(
  body: { username: string; password: string; roleId: string } & Partial<UserProfile>,
): Promise<ManagedUser> {
  return apiFetch("/api/users", { method: "POST", body: JSON.stringify(body) });
}
export function updateUser(
  id: string,
  body: { username?: string; roleId?: string } & Partial<UserProfile>,
): Promise<ManagedUser> {
  return apiFetch(`/api/users/${id}`, { method: "PUT", body: JSON.stringify(body) });
}
export function resetUserPassword(id: string, password: string): Promise<{ ok: boolean }> {
  return apiFetch(`/api/users/${id}/password`, { method: "PUT", body: JSON.stringify({ password }) });
}
export function deleteUser(id: string): Promise<{ ok: boolean }> {
  return apiFetch(`/api/users/${id}`, { method: "DELETE" });
}

/** Roles + the full permission catalog (for the composer checkbox grid). */
export function fetchRoles(): Promise<{ catalog: Permission[]; roles: ManagedRole[] }> {
  return apiFetch("/api/roles");
}
export function createRole(body: { name: string; permissions: Permission[] }): Promise<ManagedRole> {
  return apiFetch("/api/roles", { method: "POST", body: JSON.stringify(body) });
}
export function updateRole(id: string, body: { name?: string; permissions?: Permission[] }): Promise<ManagedRole> {
  return apiFetch(`/api/roles/${id}`, { method: "PUT", body: JSON.stringify(body) });
}
export function deleteRole(id: string): Promise<{ ok: boolean }> {
  return apiFetch(`/api/roles/${id}`, { method: "DELETE" });
}

// --- Application logs (app_logs) ------------------------------------------
/** Read recent diagnostic logs (gated server-side by log:read). */
export function fetchLogs(params: {
  limit?: number;
  level?: string;
  source?: string;
  since?: string;
} = {}): Promise<{ logs: AppLogRecord[] }> {
  const q = new URLSearchParams();
  if (params.limit) q.set("limit", String(params.limit));
  if (params.level) q.set("level", params.level);
  if (params.source) q.set("source", params.source);
  if (params.since) q.set("since", params.since);
  const qs = q.toString();
  return apiFetch(`/api/logs${qs ? `?${qs}` : ""}`);
}

// --- Backup ---------------------------------------------------------------
// On-site encrypted DB backup. See wiki/concepts/backup-recovery.md.

export interface BackupStatus {
  configured: boolean;
  /** Admin-chosen target directory (null = not set). */
  targetDir: string | null;
  /** Admin-tuned retention (resolved value: DB or code default). */
  keepLast: number;
  keepDailyDays: number;
  /** Whether the env encryption key is present (a missing key is flagged distinctly). */
  keyPresent: boolean;
  running: boolean;
  lastSuccessAt: string | null;
  lastResult: { path: string; bytes: number; prunedFiles: number } | null;
  lastErrorAt: string | null;
  lastError: string | null;
}

export async function fetchBackupStatus(): Promise<BackupStatus> {
  return apiFetch("/api/backup/status");
}

export interface BackupConfigPatch {
  /** "" clears the target. Omit a field to leave it unchanged; null resets retention to default. */
  targetDir?: string | null;
  keepLast?: number | null;
  keepDailyDays?: number | null;
}

/** Update backup config (target dir and/or retention). Returns the new status. */
export async function setBackupConfig(patch: BackupConfigPatch): Promise<BackupStatus> {
  return apiFetch("/api/backup/config", { method: "PUT", body: JSON.stringify(patch) });
}

export interface TargetCheck {
  ok: boolean;
  /** "empty" | "missing" | "not_a_dir" | "not_writable" when !ok. */
  reason?: string;
}

/** Probe a candidate target path server-side (exists / is a dir / is writable). */
export async function testBackupTarget(targetDir: string): Promise<TargetCheck> {
  return apiFetch("/api/backup/test", { method: "POST", body: JSON.stringify({ targetDir }) });
}

export interface BackupRunResult {
  ok: true;
  path: string;
  bytes: number;
  prunedFiles: number;
}

/** Trigger a manual "back up now". Throws on 409 (not configured) / 500 (run failed). */
export async function runBackup(): Promise<BackupRunResult> {
  return apiFetch("/api/backup/run", { method: "POST" });
}

// --- Device setup ---------------------------------------------------------

export interface ConfigField {
  key: string;
  label: string;
  type: "string" | "number" | "boolean" | "host" | "port" | "secret" | "select";
  required: boolean;
  default?: string | number | boolean;
  options?: { value: string; label: string }[];
  help?: string;
}

export interface CatalogEntry {
  id: string;
  label: string;
  description: string;
  transports: string[];
  configFields: ConfigField[];
}

export type DeviceCategory = "access" | "reader" | "camera" | "printer";
export type Catalog = Record<DeviceCategory, CatalogEntry[]> & {
  /** Driver ids that support LAN discovery. */
  discoverable: string[];
  /** Driver ids that push to the backend (need a backend IP at assign time). */
  pushCapable: string[];
};

export function fetchCatalog(): Promise<Catalog> {
  return apiFetch<Catalog>("/api/setup/catalog");
}

export interface DiscoveredDevice {
  id: string;
  label: string;
  config: Record<string, string | number | boolean>;
  info?: Record<string, string>;
  health: { status: string; detail?: string };
}

/** Scan the LAN for devices a driver can discover. Admin-only. */
export async function discoverDevices(driverId: string): Promise<DiscoveredDevice[]> {
  const body = await apiFetch<{ devices: DiscoveredDevice[] }>(
    `/api/setup/discover/${driverId}`,
  );
  return body.devices;
}

export type ConfigValue =
  | string
  | number
  | boolean
  | null
  | ConfigValue[]
  | { [k: string]: ConfigValue };
export type DeviceConfig = Record<string, ConfigValue>;

/** Direction a barrier/relay (or a device bound to it) serves. */
export type Direction = "entry" | "exit" | "both";

/** The EVENT a relay reacts to. entry/exit/both → pulse a barrier; `radarAlert` → drive a
 *  non-barrier alert lamp (blink while its trigger input is active, SOLID once the camera
 *  confirms a car). The action is implied by the event. */
export type RelayEvent = Direction | "radarAlert";

/** What a controller input terminal means: a transient-entry `button`, a one-car-one-ticket
 *  `presence` sensor (loop/radar), or an `alertTrigger` for a radarAlert lamp. */
export type InputRole = "button" | "presence" | "alertTrigger";

/** One INPUT terminal the host reads (the twin of RelaySpec). An exit radar is just another
 *  `presence` row serving the exit relay. */
export interface InputSpec {
  input: number;
  role: InputRole;
  /** The barrier relay this input serves (required for button/presence; optional for
   *  alertTrigger). */
  relay?: number;
  /** presence only — induction LOOP or RADAR (label only). */
  kind?: "loop" | "radar";
  /** This terminal idles HIGH / is active-LOW (e.g. a radar wired opposite the button). */
  activeLow?: boolean;
  /** button only — presence-less fallback cooldown (seconds). */
  cooldownSec?: number;
}

/** One relay on an access controller: the event it reacts to. Input wiring lives in
 *  `config.inputs[]`; the legacy per-relay button/presence fields are still read for
 *  back-compat but no longer written. */
export interface RelaySpec {
  relay: number;
  /** The event this relay reacts to (UI label: "Event"). */
  direction: RelayEvent;
  // ── legacy input fields (read-only back-compat; superseded by config.inputs[]) ──
  button?: number;
  presenceInput?: number;
  presenceKind?: "loop" | "radar";
  presenceActiveLow?: boolean;
  entryCooldownSec?: number;
  // ── radarAlert-only ──
  /** Input terminal whose active edge starts the blink (the radar). */
  triggerInput?: number;
  /** Which lane's camera locks this lamp SOLID (default entry). An exit radar locks on exit. */
  lockLane?: "entry" | "exit";
  /** Blink cadence (ms on / ms off) for the radar-only state. Default 500/500. */
  blinkOnMs?: number;
  blinkOffMs?: number;
}

export interface TestResult {
  health: { status: string; detail?: string };
  preconditions: {
    ok: boolean;
    issues: { key: string; message: string; fixable: boolean }[];
  };
}

/** Test a device config (reachability + preconditions) without saving. Pass the
 *  device `id` when editing an existing one so the server re-merges its stored
 *  machine secrets (e.g. the relay password redacted from the client). */
export function testDevice(driverId: string, config: DeviceConfig, id?: string): Promise<TestResult> {
  return apiFetch<TestResult>("/api/setup/test", {
    method: "POST",
    body: JSON.stringify({ driverId, config, ...(id ? { id } : {}) }),
  });
}

/** Result of an end-to-end ANPR probe on a camera: snapshot → vision analyze. */
export type AnprTestResult =
  | {
      ok: true;
      plate: string;
      confidence: number;
      region: string | null;
      lowConfidence: boolean;
      modelVersion: string;
      tookMs: number;
    }
  | {
      ok: false;
      /** vision-disabled | snapshot-failed | no-plate */
      reason: string;
      detail?: string;
      tookMs?: number;
    };

/** Take a live snapshot off the camera and run ANPR on it — without saving. Reports
 *  whether a plate was extracted, the read, and how long it took. */
export function testAnpr(driverId: string, config: DeviceConfig): Promise<AnprTestResult> {
  return apiFetch<AnprTestResult>("/api/setup/test-anpr", {
    method: "POST",
    body: JSON.stringify({ driverId, config }),
  });
}

/** Result of a physical print test: a real test slip is pushed to the printer. */
export type PrintTestResult =
  | { ok: true; tookMs: number }
  | { ok: false; reason: string; detail?: string; tookMs?: number };

/** Print a real test slip on the printer — without saving. Confirms the printer
 *  actually feeds paper + fires the head (healthCheck only opens the transport). */
export function testPrint(
  driverId: string,
  config: DeviceConfig,
  id?: string,
): Promise<PrintTestResult> {
  return apiFetch<PrintTestResult>("/api/setup/test-print", {
    method: "POST",
    body: JSON.stringify({ driverId, config, id }),
  });
}

export type RelayTestResult =
  | { ok: true; firedAt: string; tookMs: number }
  | { ok: false; reason: string; detail?: string; tookMs?: number };

/** Pulse a SAVED controller's barrier relay to test the wiring — physically opens the
 *  barrier. The server signs a `barrier_open_command` (reason setup.relayTest) before
 *  firing, so the open is explained, not a reconciliation anomaly. Saved controller only
 *  (needs a persisted id for attribution). */
export function testRelay(id: string, relay: number): Promise<RelayTestResult> {
  return apiFetch<RelayTestResult>("/api/setup/test-relay", {
    method: "POST",
    body: JSON.stringify({ id, relay }),
  });
}

// --- Admin reports -------------------------------------------------------
export type ReportBucket = "hour" | "day" | "month";

export interface ReportSeriesPoint {
  bucket: string;
  entries: number;
  exits: number;
  revenueMinor: number;
  payments: number;
}

export interface ReportTotals {
  entries: number;
  exits: number;
  payments: number;
  revenueMinor: number;
  cashMinor: number;
  cardMinor: number;
  ticketMinor: number;
  subscriptionSalesMinor: number;
  subscriptionWindowMinor: number;
  closedSessions: number;
  totalParkedMinutes: number;
  avgParkedMinutes: number;
  medianParkedMinutes: number;
}

export interface ReportSubscriptionStats {
  active: number;
  suspended: number;
  revoked: number;
  currentlyValid: number;
  coveredCars: number;
}

export interface ReportSummary {
  from: string;
  to: string;
  bucket: ReportBucket;
  tz: string;
  currency: string | null;
  totals: ReportTotals;
  series: ReportSeriesPoint[];
  entriesByHour: number[];
  subscriptions: ReportSubscriptionStats;
}

/** The whole admin dashboard (totals + series + peak-hours + subscriptions) for a range. */
export function fetchReport(from: string, to: string, bucket: ReportBucket): Promise<ReportSummary> {
  const qs = new URLSearchParams({ from, to, bucket }).toString();
  return apiFetch<ReportSummary>(`/api/reports/summary?${qs}`);
}

/** URL for the CSV export of the per-bucket series (opened/downloaded directly; the
 *  auth cookie rides along same-origin). */
export function reportCsvUrl(from: string, to: string, bucket: ReportBucket): string {
  const qs = new URLSearchParams({ from, to, bucket }).toString();
  return apiUrl(`/api/reports/summary.csv?${qs}`);
}

// --- Recycle bin (soft-deleted master data) ------------------------------
export type RecycleKind = "user" | "role" | "subscription" | "plan" | "tariff";

export interface RecycleBinItem {
  kind: RecycleKind;
  id: string;
  label: string;
  deletedAt: string;
  deletedBy: string | null;
}

export interface RecycleBin {
  items: RecycleBinItem[];
  retentionDays: number;
}

/** Everything currently in the recycle bin + the retention window (days). */
export function fetchRecycleBin(): Promise<RecycleBin> {
  return apiFetch<RecycleBin>("/api/recycle-bin");
}

/** Restore a soft-deleted item (back to its catalog). 409 if a live row would collide. */
export function restoreRecycleItem(kind: RecycleKind, id: string): Promise<{ restored: boolean }> {
  return apiFetch<{ restored: boolean }>(`/api/recycle-bin/${kind}/${encodeURIComponent(id)}/restore`, {
    method: "POST",
  });
}

/** Permanently purge a soft-deleted item. Irreversible. */
export function purgeRecycleItem(kind: RecycleKind, id: string): Promise<void> {
  return apiFetch<void>(`/api/recycle-bin/${kind}/${encodeURIComponent(id)}`, { method: "DELETE" });
}

export interface BackendIpCandidate {
  ip: string;
  iface: string;
  onDeviceSubnet: boolean;
}

/** Local IPs the device could push to (on-subnet first), for the wizard to
 *  pre-fill/override. Matters on multi-NIC hosts. */
export function fetchBackendIps(
  host: string,
): Promise<{ candidates: BackendIpCandidate[]; port: number }> {
  return apiFetch(`/api/setup/backend-ips?host=${encodeURIComponent(host)}`);
}

export interface AssignBody {
  category: DeviceCategory;
  driverId: string;
  // Direction/binding lives in config: access → config.relays=[{relay,direction,button?}];
  // reader/camera → config.controllerId + config.relay.
  config: DeviceConfig;
  /** Backend IP the device should push to (overrides auto-pick). */
  backendIp?: string;
}

/** Save + configure the device (preconditions, push setup), then persist. */
export function assignDevice(body: AssignBody): Promise<AssignResult> {
  return apiFetch("/api/setup/assign", { method: "POST", body: JSON.stringify(body) });
}

/** Re-configure an existing device in place, keeping its id (and so its push
 *  URL). Category/driver are fixed at create time, so only config changes. */
export function editDevice(
  id: string,
  body: Omit<AssignBody, "category" | "driverId">,
): Promise<AssignResult> {
  return apiFetch(`/api/setup/assign/${id}`, { method: "PATCH", body: JSON.stringify(body) });
}

/** A persisted device assignment (one per instance; machine-only secrets stripped). */
export interface Assignment {
  id: string;
  category: DeviceCategory;
  driverId: string;
  config: DeviceConfig;
  enabled: boolean;
  createdAt?: string;
}

/** Assign response = the saved assignment plus any residual-risk warnings
 *  (e.g. "string protocol could not be disabled — finish in the device web UI"). */
export interface AssignResult extends Assignment {
  warnings?: string[];
}

export interface SetupState {
  completedAt: string | null;
  assignments: Assignment[];
}

/** Current setup status + all assigned device instances. */
export function fetchState(): Promise<SetupState> {
  return apiFetch<SetupState>("/api/setup/state");
}

/** Remove one assigned device instance by id. */
export function unassignDevice(id: string): Promise<void> {
  return apiFetch(`/api/setup/assign/${id}`, { method: "DELETE" });
}

// --- Tariff composer ------------------------------------------------------

export interface TariffBlock {
  uptoMin: number | null;
  priceMinorPerIncrement: number;
}
// Mirrors @parking/shared. Two shapes: V1 (bare ladder) and V2 (default + windowed
// cards by time-of-day / dow / date / category, flat or laddered). The discriminant
// is the presence of `defaultCard`. See wiki/concepts/tariff-time-tiers.md.
export interface TariffStructureV1 {
  gracePeriodEntryMin: number;
  incrementMin: number;
  blocks: TariffBlock[];
  /** STEPPED ("up-to") total-by-duration table; when non-empty it replaces `blocks`. */
  steps?: TariffStep[];
  dailyCapMinor: number | null;
  lostTicketMinor: number;
  gracePeriodExitMin: number;
  overstay: "reprice";
}
export interface TariffWindow {
  dow?: number[];
  dateFrom?: string;
  dateTo?: string;
  fromHour?: string;
  toHour?: string;
}
export interface TariffCard {
  name: string;
  priority: number;
  category?: string;
  window?: TariffWindow;
  flatMinor?: number;
  blocks?: TariffBlock[];
  /** STEPPED ("up-to") table (defaultCard only); mutually exclusive with flat/blocks. */
  steps?: TariffStep[];
  dailyCapMinor?: number | null;
}
/** One row of a STEPPED ("up-to") tariff: a TOTAL price for a stay up to and including
 *  `uptoMin` minutes (cumulative, not marginal). Mirrors @parking/shared TariffStep. */
export interface TariffStep {
  uptoMin: number;
  totalMinor: number;
}

export interface TariffStructureV2 {
  version: 2;
  tz: string;
  gracePeriodEntryMin: number;
  incrementMin: number;
  lostTicketMinor: number;
  gracePeriodExitMin: number;
  overstay: "reprice";
  defaultCard: TariffCard;
  windowedCards?: TariffCard[];
}
export type TariffStructure = TariffStructureV1 | TariffStructureV2;

/** True when a structure is the windowed V2 shape (mirrors @parking/shared isTariffV2). */
export function isTariffV2(t: TariffStructure): t is TariffStructureV2 {
  return (t as TariffStructureV2).defaultCard != null;
}
export interface TariffVersion {
  id: string;
  tariffId: string;
  effectiveFrom: string;
  currency: string;
  structure: TariffStructure;
  createdBy?: string | null;
  createdAt?: string;
}
export interface TariffState {
  tariffId: string;
  active: TariffVersion | null;
  versions: TariffVersion[];
}

export function fetchTariff(): Promise<TariffState> {
  return apiFetch<TariffState>("/api/tariff");
}

/** Publish a new immutable tariff version (becomes the active rate card). */
export function publishTariffVersion(body: {
  currency: string;
  structure: TariffStructure;
  effectiveFrom?: string;
}): Promise<TariffVersion> {
  return apiFetch("/api/tariff/versions", { method: "POST", body: JSON.stringify(body) });
}

// --- Tariff Lab (simulator) -----------------------------------------------

export interface SimPayment {
  paidAt: string;
  graceExitMin: number | null;
}
export interface SimSessionPricing {
  periodStart: string;
  amountMinor: number;
  overstay: boolean;
  withinGrace: boolean;
  graceExpiresAt: string | null;
}
export interface SimulateResult {
  currency: string | null;
  pricing: SimSessionPricing;
  curve: { minutes: number; amountMinor: number }[];
  gracePeriodExitMin: number;
}
export interface SimulateBody {
  enteredAt: string;
  asOf: string;
  payments?: SimPayment[];
  category?: string;
  tariffVersionId?: string;
  structure?: TariffStructure;
  currency?: string;
}

/** Price a hypothetical session — pure, no ledger write. See Tariff Lab. */
export function simulateTariff(body: SimulateBody): Promise<SimulateResult> {
  return apiFetch("/api/tariff/simulate", { method: "POST", body: JSON.stringify(body) });
}

export interface SimSessionLoad {
  identity: string;
  enteredAt: string;
  exitedAt: string | null;
  payments: SimPayment[];
  category: string | null;
  tariffVersionId: string | null;
}

/** Prefill the lab from a real ledger session. */
export function loadSimSession(identity: string): Promise<SimSessionLoad> {
  return apiFetch(`/api/tariff/simulate/session/${encodeURIComponent(identity)}`);
}

// --- Subscriptions --------------------------------------------------------

export interface SubscriptionCredential {
  kind: "rf" | "qr";
  value: string;
}
export type SubscriptionPeriod = "day" | "week" | "month";

/** A subscriber's allowed parking window (minutes-from-local-midnight) on selected days.
 *  A scan outside the window is charged the transient tariff for the gap. days: 0=Sun..6=Sat
 *  (empty = every day); the window [fromMin,toMin) wraps past midnight when toMin ≤ fromMin. */
export interface PlanTimeframes {
  days?: number[];
  fromMin: number;
  toMin: number;
  graceMin?: number;
  tz?: string;
}

/** A subscription PLAN version — admin-composed, versioned config the operator sells
 *  from (so they never type a price). */
export interface SubscriptionPlan {
  id: string;
  planId: string;
  name: string;
  period: SubscriptionPeriod;
  pricePerPeriodMinor: number;
  currency: string;
  effectiveFrom: string;
  active: boolean;
  /** Allowed-time windows (tariff bridge); null/absent = 24/7, no time charge. */
  timeframes?: PlanTimeframes | null;
}

export interface Subscription {
  id: string;
  holderName: string | null;
  contact: string | null;
  /** Price billed for the window in minor units — DERIVED from the plan. null = comp. */
  priceMinor: number | null;
  period: SubscriptionPeriod;
  currency: string | null;
  /** Which plan + immutable version priced this sale (null for legacy/comp). */
  planId: string | null;
  planVersionId: string | null;
  /** Cars covered by this one subscription (price was ×N). Default 1. */
  quantity: number;
  maxConcurrent: number | null;
  validFrom: string | null;
  validTo: string | null;
  status: "active" | "suspended" | "revoked";
  credentials: SubscriptionCredential[];
  plates: string[];
}
/** A credential as SENT to the server: a QR value may be omitted/blank → the server
 *  auto-generates an unguessable code. RF must carry the card id. */
export interface SubscriptionCredentialInput {
  kind: "rf" | "qr";
  value?: string;
}
export type SubscriptionInput = {
  holderName: string | null;
  contact: string | null;
  /** PRICED SALE: the plan selected. Price is looked up server-side (never typed).
   *  Omit for a comp subscription. */
  planId?: string | null;
  /** Coverage window. Priced sale: validFrom defaults to now, validTo required. */
  validFrom: string | null;
  validTo: string | null;
  /** Cars covered (price ×N). Default 1. */
  quantity?: number;
  maxConcurrent: number | null;
  status?: Subscription["status"];
  /** How the sale fee was tendered (cash → drawer, card → bank). Used at CREATE when a
   *  plan is sold (the sale appends a signed payment); ignored on update. */
  tender?: "cash" | "card";
  credentials: SubscriptionCredentialInput[];
  plates: string[];
  /** UPDATE-only correction: move the sub to a different VERSION of its SAME plan. Price
   *  stays frozen; only the access rules change going forward. Requires subscription:plan. */
  planVersionId?: string;
};

/** A server-computed quote: periods (ceil) × per-period price × quantity for a span. */
export interface SubscriptionQuote {
  periods: number;
  amountMinor: number;
  currency: string;
  period: SubscriptionPeriod;
  quantity?: number;
  plan: SubscriptionPlan;
}

/** The create response = the saved subscription + the auto-print outcome, plus the
 *  recorded SALE (the signed payment) when a price was collected. */
export type SubscriptionCreated = Subscription & {
  printed: boolean;
  printedBy?: string;
  printError?: string;
  /** Present when a priced subscription was sold: the signed payment just appended. */
  sale?: {
    amountMinor: number;
    currency: string | null;
    tender: "cash" | "card";
    periods: number;
    inShift: boolean;
  };
};

export function fetchSubscriptions(): Promise<{ subscriptions: Subscription[] }> {
  return apiFetch("/api/subscriptions");
}

// --- Subscription plan catalog (admin-composed; operator sells from it) ------
export function fetchSubscriptionPlans(all = false): Promise<{ plans: SubscriptionPlan[] }> {
  return apiFetch(`/api/subscription-plans${all ? "?all=1" : ""}`);
}
export function createSubscriptionPlan(body: {
  planId?: string;
  name: string;
  period: SubscriptionPeriod;
  pricePerPeriodMinor: number;
  currency: string;
  effectiveFrom?: string;
  timeframes?: PlanTimeframes | null;
}): Promise<SubscriptionPlan> {
  return apiFetch("/api/subscription-plans", { method: "POST", body: JSON.stringify(body) });
}
export function retireSubscriptionPlan(planId: string): Promise<{ planId: string; retired: boolean }> {
  return apiFetch(`/api/subscription-plans/${encodeURIComponent(planId)}/retire`, { method: "POST" });
}
export function reactivateSubscriptionPlan(planId: string): Promise<{ planId: string; reactivated: boolean }> {
  return apiFetch(`/api/subscription-plans/${encodeURIComponent(planId)}/reactivate`, { method: "POST" });
}
/** Delete a plan (all versions). Rejects (409 plan_in_use) if any subscription uses it. */
export function deleteSubscriptionPlan(planId: string): Promise<{ planId: string; deleted: boolean }> {
  return apiFetch(`/api/subscription-plans/${encodeURIComponent(planId)}`, { method: "DELETE" });
}
/** Live quote for the sell form (server-computed; the operator can't override it). */
export function quoteSubscription(body: {
  planId: string;
  validFrom: string | null;
  validTo: string;
  quantity?: number;
}): Promise<SubscriptionQuote> {
  return apiFetch("/api/subscriptions/quote", { method: "POST", body: JSON.stringify(body) });
}
export function createSubscription(body: SubscriptionInput): Promise<SubscriptionCreated> {
  return apiFetch("/api/subscriptions", { method: "POST", body: JSON.stringify(body) });
}
/** Re-print a subscription's QR card (failed auto-print / lost card). */
export function printSubscription(id: string): Promise<{ ok: boolean; printedBy: string }> {
  return apiFetch(`/api/subscriptions/${id}/print`, { method: "POST" });
}

// --- Credential capture ("enroll a card" on a chosen reader) ---------------

export interface ReaderInfo {
  id: string;
  driverId: string;
  direction: "entry" | "exit" | "both";
}
export type CaptureState =
  | { status: "idle" }
  | { status: "armed"; deviceId: string; armedAt: number; expiresAt: number }
  | { status: "captured"; deviceId: string; value: string; capturedAt: number }
  | { status: "expired"; deviceId: string };

export function fetchReaders(): Promise<{ readers: ReaderInfo[] }> {
  return apiFetch("/api/subscriptions/readers");
}
export function armCapture(deviceId: string): Promise<{ expiresAt: number }> {
  return apiFetch("/api/subscriptions/capture/arm", { method: "POST", body: JSON.stringify({ deviceId }) });
}
export function pollCapture(): Promise<CaptureState> {
  return apiFetch("/api/subscriptions/capture");
}
export function cancelCapture(): Promise<{ ok: boolean }> {
  return apiFetch("/api/subscriptions/capture/cancel", { method: "POST" });
}
export function updateSubscription(id: string, body: SubscriptionInput): Promise<Subscription> {
  return apiFetch(`/api/subscriptions/${id}`, { method: "PUT", body: JSON.stringify(body) });
}
export function revokeSubscription(id: string): Promise<Subscription> {
  return apiFetch(`/api/subscriptions/${id}/revoke`, { method: "POST" });
}
export function deleteSubscription(id: string): Promise<void> {
  return apiFetch(`/api/subscriptions/${id}`, { method: "DELETE" });
}

// --- Shifts ---------------------------------------------------------------

export interface ShiftStatus {
  /** The requesting (logged-in) operator. */
  operator: string;
  /** The SINGLE site-wide open shift (startedAt + whose), or null if none open. */
  open: { startedAt: string; operator: string | null } | null;
  /** True iff the open shift belongs to the requesting operator (can close it). */
  isMine: boolean;
  /** Live physical drawer balance (cash payments + cash movements). */
  drawerMinor: number;
  currency: string | null;
}
/** Takings split by SOURCE — transient tickets vs subscriber money (monthly sales +
 *  out-of-window charges). Cash+card combined; the per-tender totals stay separate for
 *  the drawer. Shared by the X-report, the close Z-report, and the history summary. */
export interface ShiftSourceSplit {
  ticketTotalMinor: number;
  subscriptionTotalMinor: number;
  subscriptionSalesMinor: number;
  subscriptionWindowMinor: number;
}

export interface ShiftReport extends ShiftSourceSplit {
  operator: string;
  startedAt: string;
  endedAt: string;
  cashTotalMinor: number;
  cardTotalMinor: number;
  currency: string | null;
  paymentCount: number;
  // Drawer (carries across shifts).
  openingFloatMinor: number;
  cashAddedMinor: number;
  cashRemovedMinor: number;
  expectedDrawerMinor: number;
  printed: boolean;
}

export function fetchShift(): Promise<ShiftStatus> {
  return apiFetch("/api/shift/current");
}
export function openShift(): Promise<{ startedAt: string; openingFloatMinor: number }> {
  return apiFetch("/api/shift/open", { method: "POST" });
}
export function closeShift(): Promise<ShiftReport> {
  return apiFetch("/api/shift/close", { method: "POST" });
}

/** Mid-shift X-report: the open shift's takings + drawer "so far" (read-only — no
 *  event is appended). Same figures the Z-report will print at close. `asOf` is the
 *  snapshot instant. */
export interface XReport extends ShiftSourceSplit {
  operator: string;
  startedAt: string;
  endedAt: string; // = asOf
  asOf: string;
  cashTotalMinor: number;
  cardTotalMinor: number;
  currency: string | null;
  paymentCount: number;
  openingFloatMinor: number;
  cashAddedMinor: number;
  cashRemovedMinor: number;
  expectedDrawerMinor: number;
}

/** Fetch the mid-shift X-report; resolves to null when no shift is open (204). */
export async function fetchShiftReport(): Promise<XReport | null> {
  return (await apiFetch<XReport | undefined>("/api/shift/report")) ?? null;
}

// --- Drawer cash movements (operator records, admin reviews) ---------------------
// Redesigned 2026-07-01: an operator RECORDS a receipt/disbursement freely; an admin
// REVIEWS it after the fact (authorize/deny — a flag, never a cash reversal). See
// wiki/concepts/shift.md.

export type MovementStatus = "pending" | "authorized" | "denied";

/** A drawer movement with its admin-review status. */
export interface DrawerMovement {
  id: string;
  type: "cash_in" | "cash_out";
  /** Positive magnitude; direction is the type. */
  amountMinor: number;
  currency: string | null;
  reason: string | null;
  operator: string;
  voucherNo: string | null;
  at: string;
  status: MovementStatus;
  reviewedBy: string | null;
  reviewNote: string | null;
  reviewedAt: string | null;
}

/** Operator RECORDS a drawer movement — cash_in (Mandat Arkëtimi / pay-IN) or cash_out
 *  (Mandat Pagese / pay-OUT). Direction is the TYPE; amountMinor a positive magnitude.
 *  No admin sign-off at creation — it's reviewed afterward. */
export function recordDrawerMovement(args: {
  type: "cash_in" | "cash_out";
  amountMinor: number;
  reason: string;
  currency?: string;
}): Promise<{
  type: "cash_in" | "cash_out";
  amountMinor: number;
  voucherNo: string;
  balanceMinor: number;
  printed: boolean;
}> {
  return apiFetch("/api/drawer/movement", { method: "POST", body: JSON.stringify(args) });
}

/** List drawer movements + review status. Operators get their OWN; a reviewer gets all
 *  and may filter by status (the pending review queue). */
export function fetchDrawerMovements(status?: MovementStatus): Promise<{
  movements: DrawerMovement[];
  scope: "all" | "self";
}> {
  const qs = status ? `?status=${encodeURIComponent(status)}` : "";
  return apiFetch(`/api/drawer/movements${qs}`);
}

/** Admin AUTHORIZES or DENIES a recorded movement (a flag — never a cash reversal). */
export function reviewDrawerMovement(args: {
  refId: string;
  decision: "authorize" | "deny";
  note?: string;
}): Promise<{ refId: string; decision: "authorize" | "deny"; reviewedBy: string; at: string }> {
  return apiFetch("/api/drawer/review", { method: "POST", body: JSON.stringify(args) });
}

/** A completed shift (reconstructed from its signed Z-report). */
export interface ShiftSummary extends ShiftSourceSplit {
  id: string;
  index: number;
  operator: string;
  startedAt: string;
  endedAt: string;
  cashTotalMinor: number;
  cardTotalMinor: number;
  currency: string | null;
  paymentCount: number;
  openingFloatMinor: number;
  cashAddedMinor: number;
  cashRemovedMinor: number;
  expectedDrawerMinor: number;
}

/** Completed shift history. The server scopes by permission: operators get their
 *  own shifts only (filter args ignored); admins (shift:cash) get all, optionally
 *  filtered by operator + a from/to window over the shift start. `scope` echoes
 *  which the server applied, so the UI can show/hide the filter. */
export function fetchShifts(params: { operator?: string; from?: string; to?: string } = {}): Promise<{
  shifts: ShiftSummary[];
  scope: "all" | "self";
}> {
  const qs = new URLSearchParams();
  if (params.operator) qs.set("operator", params.operator);
  if (params.from) qs.set("from", params.from);
  if (params.to) qs.set("to", params.to);
  const q = qs.toString();
  return apiFetch(`/api/shifts${q ? `?${q}` : ""}`);
}

// --- Site config / occupancy ----------------------------------------------

export interface Occupancy {
  count: number;
  capacity: number | null;
  free: number | null;
  full: boolean;
}

/** Capacity + optional park metadata (all nullable). Mirrors site_config. */
export interface SiteConfig {
  capacity: number | null;
  /** Default for the booth "print exit ticket" checkbox (booth-geography knob). */
  exitVoucherDefault: boolean;
  /** Site default monthly subscription price (minor units); pre-fills the form. */
  subscriptionMonthlyPriceMinor: number | null;
  /** Reserve a spot for each active subscriber's car(s) in the occupancy/full gate. */
  reserveSubscriberSpots: boolean;
  /** Master switch for the ANPR subscriber-entry bridge (auto-open on a plate read). */
  anprEntryEnabled: boolean;
  parkName: string | null;
  operatorName: string | null;
  /** NIUS — Albanian tax/identification number. */
  nius: string | null;
  address: string | null;
  phone: string | null;
  email: string | null;
  /** IANA timezone for tariff wall-clock windows (e.g. "Europe/Tirane"). Copied into
   *  each published tariff version so its windows are frozen. */
  timezone: string | null;
  /** Default vehicle/customer category frozen onto each transient entry (V2 pricing). */
  defaultVehicleCategory: string | null;
}

export function fetchOccupancy(): Promise<Occupancy> {
  return apiFetch("/api/occupancy");
}

// --- Device status (the booth footer) -------------------------------------

/** Live status of one configured device — mirrors the server's DeviceStatusEvent.
 *  Every enabled device is polled (printers via rich readStatus, the rest via
 *  healthCheck) and flattened to one traffic-light. Pushed over the WS; the REST
 *  snapshot below is the initial load / fallback. */
export interface DeviceStatus {
  deviceId: string;
  driverId: string;
  category: "access" | "reader" | "camera" | "printer" | "vision";
  /** Role/direction token for the footer label (NOT the vendor) — the client
   *  localises it next to the category, e.g. "Lexuesi hyrje", "Printer kabina". */
  roleKind: "entry" | "exit" | "both" | "mixed" | "lane" | "booth" | null;
  state: "ready" | "degraded" | "offline";
  detail?: string;
  checkedAt: string;
}

export function fetchDeviceStatus(): Promise<{ devices: DeviceStatus[] }> {
  return apiFetch("/api/devices/status");
}

// --- Ledger events (the signed audit trail; read-only) --------------------

/** A persisted ledger row. Re-exported from shared so UI code has one source of
 *  truth for the event shape (the same type the WS pushes). */
export type { LedgerEvent, LogLevel, LogSource } from "@parking/shared";
export type { AppLogRecord };

/** Recent ledger events, newest first (default 100, max 1000). Used for the
 *  booth feed's initial load; live updates then arrive over the WS. `since` (ISO)
 *  scopes to events at/after that instant — the booth passes the current shift's
 *  start so the feed shows ONLY this shift's activity. */
export function fetchEvents(
  limit = 100,
  since?: string,
  until?: string,
): Promise<{ events: import("@parking/shared").LedgerEvent[] }> {
  const qs = new URLSearchParams({ limit: String(limit) });
  if (since) qs.set("since", since);
  if (until) qs.set("until", until);
  return apiFetch(`/api/events?${qs.toString()}`);
}

// --- Booth: session lookup, payment, exit ---------------------------------

/** One-read session view for the booth pay/exit modal (mirrors server SessionLookup). */
export interface SessionLookup {
  identity: string;
  found: boolean;
  open: boolean;
  enteredAt: string | null;
  exitedAt: string | null;
  paidAt: string | null;
  amountMinor: number | null;
  currency: string | null;
  /** Amount actually PAID (sum of payment events), independent of what's owed now. */
  paidMinor: number | null;
  paidCurrency: string | null;
  withinGrace: boolean;
  graceExpiresAt: string | null;
  /** OVERSTAY: paid transient, walk-back grace expired, no exit — a new period began;
   *  owes a fresh top-up (amountMinor); cannot exit for free. */
  overstay: boolean;
  /** A subscription occurrence (prepaid — no pay flow; barrier-open assist only). */
  subscription: boolean;
  subscriptionId: string | null;
  subscriptionHolder: string | null;
  /** Advisory licence plate recognized for this session (ANPR). Null when none. */
  plate: string | null;
}

/** Look up a ticket/session for the booth modal (entry/exit, paid, amount owed). */
export function lookupSession(identity: string): Promise<SessionLookup> {
  return apiFetch(`/api/session/${encodeURIComponent(identity)}`);
}

/** One row in the booth Active Sessions list (mirrors server ActiveSession). */
export interface ActiveSession {
  identity: string;
  source: string | null;
  enteredAt: string;
  exitedAt: string | null;
  open: boolean;
  paidAt: string | null;
  amountMinor: number | null;
  currency: string | null;
  withinGrace: boolean;
  graceExpiresAt: string | null;
  /** OVERSTAY: paid transient whose walk-back grace lapsed with no signed exit — a new
   *  period began (re-parked) or the car is faulty/abandoned. Owes a fresh top-up;
   *  flagged so the operator reconciles, never a free exit. */
  overstay: boolean;
  /** A subscription occurrence (prepaid — no pay flow; barrier-open assist only). */
  subscription: boolean;
  subscriptionId: string | null;
  subscriptionHolder: string | null;
  /** Advisory licence plate recognized for this session (ANPR). Null when none. */
  plate: string | null;
}

/** Active sessions: still-inside OR exited-but-within-grace (barrier unconfirmed). */
export function fetchActiveSessions(): Promise<{ sessions: ActiveSession[] }> {
  return apiFetch("/api/sessions/active");
}

/** Human-intervention barrier re-open for a paid active session (damaged ticket /
 *  phantom re-close). Signs an audited anomaly; never a 2nd exit. */
export function reopenBarrier(identity: string): Promise<{ ok: true; opened: boolean; reason?: string }> {
  return apiFetch("/api/barrier/reopen", { method: "POST", body: JSON.stringify({ identity }) });
}

/** Take payment for a session → signed payment event. `overrideMinor` sets an
 *  operator amount (lost ticket / dispute). */
export function paySession(
  identity: string,
  tender: "cash" | "card",
  overrideMinor?: number,
): Promise<{ amountMinor: number; currency: string }> {
  return apiFetch("/api/pay", {
    method: "POST",
    body: JSON.stringify({ identity, tender, ...(overrideMinor != null ? { overrideMinor } : {}) }),
  });
}

/** Cancel (void) a wrongly-printed transient ticket. Appends a SIGNED `void` event with
 *  the operator + a required reason; the entry itself is never edited (append-only).
 *  Refuses a subscription / already-exited / already-voided / paid ticket (409). */
export function voidTicket(identity: string, reason: string): Promise<{ ok: boolean; identity?: string }> {
  return apiFetch("/api/tickets/void", { method: "POST", body: JSON.stringify({ identity, reason }) });
}

/** Booth-driven exit result. `opened:false` = exit recorded but barrier didn't
 *  open (payment stands; operator opens manually). `swapSuspected` = the exiting car's
 *  plate is already inside under a DIFFERENT ticket (possible ticket-swap); the operator
 *  must review and re-call with override:true to release. See plate-reconciliation.md. */
export type BoothExitResult =
  | { ok: true; opened: boolean; reason?: string }
  | { ok: false; swapSuspected: true; reason: string; plate: string; otherIdentity: string; otherEnteredAt: string | null };

/** Validate + open the barrier for a session from the booth (when near the exit).
 *  Pass override:true to consciously release a suspected plate-swap exit. */
export async function boothExit(identity: string, override = false): Promise<BoothExitResult> {
  try {
    return await apiFetch<{ ok: true; opened: boolean; reason?: string }>("/api/exit", {
      method: "POST",
      body: JSON.stringify({ identity, ...(override ? { override: true } : {}) }),
    });
  } catch (e) {
    // A suspected plate-swap comes back 409 with status:"swap_suspected" + detail — surface
    // it as a structured result (not a thrown error) so the modal can warn + offer override.
    if (e instanceof ApiError && e.body?.status === "swap_suspected") {
      const b = e.body;
      return {
        ok: false,
        swapSuspected: true,
        reason: String(b.error ?? ""),
        plate: String(b.plate ?? ""),
        otherIdentity: String(b.otherIdentity ?? ""),
        otherEnteredAt: (b.otherEnteredAt as string | null) ?? null,
      };
    }
    throw e;
  }
}

/** Operator issues an entry ticket when the physical button is broken. A FLAGGED mint,
 *  server-gated on real vehicle presence (radar + camera). Returns the new ticket id. */
export function issueEntryTicket(): Promise<{ ok: true; ticketId: string; opened: boolean; overCapacity: boolean }> {
  return apiFetch("/api/entry/issue", { method: "POST", body: JSON.stringify({}) });
}

/** Print an exit voucher (paid ticket id reprinted as a barcode) + payment detail,
 *  for self-exit at a distant exit. Requires the session to be paid. */
export function printVoucher(identity: string): Promise<{ ok: boolean; printedBy: string }> {
  return apiFetch("/api/voucher", { method: "POST", body: JSON.stringify({ identity }) });
}

/** Print a standalone PAYMENT RECEIPT (entry/paid/duration/amount, no barcode).
 *  Auto-printed after a payment when no voucher is issued; also the "reprint"
 *  action. Requires the session to be paid. */
export function printReceipt(identity: string): Promise<{ ok: boolean; printedBy: string }> {
  return apiFetch("/api/receipt", { method: "POST", body: JSON.stringify({ identity }) });
}

// --- Snapshots (entry/exit evidence images) -------------------------------

export interface SnapshotMeta {
  id: string;
  direction: "entry" | "exit" | null;
  deviceId: string;
  identity: string;
  contentType: string;
  capturedAt: string;
}

/** A capture that was ATTEMPTED but failed (camera offline, config) — surfaced so a
 *  missing image isn't a silent gap. From snapshot telemetry, not the image store. */
export interface SnapshotFailure {
  direction: "entry" | "exit" | null;
  deviceId: string;
  error: string;
  occurredAt: string;
}

/** A licence plate recognized for this session by the ANPR-on-snapshot path (advisory
 *  record — see opencv-anpr-service.md). `snapshotId` links to the image it was read from. */
export interface PlateRead {
  plate: string;
  confidence: number | null;
  region: string | null;
  direction: "entry" | "exit" | null;
  snapshotId: string | null;
  at: string;
}

/** Snapshot metadata for a session identity (newest first) PLUS failed capture
 *  attempts PLUS any recognized plates. Image bytes are at `/api/snapshots/:id`. */
export function fetchSnapshots(
  identity: string,
): Promise<{ snapshots: SnapshotMeta[]; failures?: SnapshotFailure[]; plates?: PlateRead[] }> {
  return apiFetch(`/api/snapshots/by-identity/${encodeURIComponent(identity)}`);
}

/** URL for a snapshot's image bytes (cookie-authed; usable as <img src>). */
export function snapshotImageUrl(id: string): string {
  return `/api/snapshots/${encodeURIComponent(id)}`;
}
export function fetchSiteConfig(): Promise<SiteConfig> {
  return apiFetch("/api/site-config");
}
/** PUT a partial config — only the fields supplied are changed. */
export function saveSiteConfig(patch: Partial<SiteConfig>): Promise<SiteConfig> {
  return apiFetch("/api/site-config", { method: "PUT", body: JSON.stringify(patch) });
}
export function setCapacity(capacity: number | null): Promise<SiteConfig> {
  return saveSiteConfig({ capacity });
}