import { createInboxItem, type InboxItem } from "@siax/contracts/inbox";
import { resolveAction, type ResolvedAction } from "@siax/contracts/authz-ux";

/**
 * Kanonisk orderstatus (ADR-0002, C3 2026-09-29): kodnivå-union som är den
 * ENDA sanningskällan för vilka statusar som existerar. DB-kolumnen är fortfarande
 * `text` (sql/001_init.sql line ~92) men guardas av sql/015_order_status_check.sql
 * (CHECK ... NOT VALID + VALIDATE i två steg, körs EJ automatiskt mot prod).
 * 'cancelled' ingår: tests/order-flow.test.ts behandlar den som terminal status.
 */
export type OrderStatus =
  | "draft"
  | "quoted"
  | "in_production"
  | "review"
  | "accepted"
  | "delivered"
  | "cancelled";

/** Uttömmande, kanonisk lista — SQL-constrainten i sql/015 MÅSTE spegla denna. */
export const ORDER_STATUSES = [
  "draft",
  "quoted",
  "in_production",
  "review",
  "accepted",
  "delivered",
  "cancelled",
] as const satisfies readonly OrderStatus[];

/** Typ-vakt: fri text ur DB/payload klassas mot unionen (fail-closed mot read_only). */
export function isKnownOrderStatus(status: string): status is OrderStatus {
  return (ORDER_STATUSES as readonly string[]).includes(status);
}

/** Statusar som kan flyttas fram; delivered/cancelled är terminala. */
type AdvanceableStatus = Exclude<OrderStatus, "delivered" | "cancelled">;

/** Kanoniskt flöde — servern äger resolutionen (ADR-0001), UI renderar. */
export const NEXT_STATUS: Record<AdvanceableStatus, OrderStatus> = {
  draft: "quoted",
  quoted: "in_production",
  in_production: "review",
  review: "accepted",
  accepted: "delivered",
};

/** Guardad nästa-status: okänd/terminal status → null (aldrig påhittat steg). */
export function nextOrderStatus(status: string): OrderStatus | null {
  if (!isKnownOrderStatus(status)) return null;
  return NEXT_STATUS[status as AdvanceableStatus] ?? null;
}

/**
 * Server-renderad action-resolution för advance-steget (ADR-0001):
 * ägarskapenforces redan av requireOrderOwner på GET/PATCH; tillståndet
 * avgör read_only. Innan Session/roller finns i 0pt är permission alltid
 * granted för autentiserade ägare — hårdkoda aldrig denna resolve i klienten.
 * Okänd status (fri text ur DB innan sql/015-valideringen körts) → read_only.
 */
export function resolveAdvanceAction(status: string): ResolvedAction {
  if (nextOrderStatus(status)) {
    return resolveAction({ permission: "granted", entitlement: "active", approval: "not_required", readOnly: false });
  }
  return resolveAction({ permission: "granted", entitlement: "active", approval: "not_required", readOnly: true });
}

/** Orderstatus som utgör en inkorgspost (våg 3.3: orders kö = inbox). */
const INBOX_ELIGIBLE: Partial<Record<OrderStatus, { kind: "task" | "approval"; priority: "normal" | "high" }>> = {
  draft: { kind: "task", priority: "normal" },
  quoted: { kind: "task", priority: "normal" },
  in_production: { kind: "task", priority: "normal" },
  review: { kind: "approval", priority: "high" },
};

/**
 * Server-renderad inkorgspost (ADR-0001-mönstret): en order som väntar på
 * nästa steg projiceras på universal-inbox-konvolverna. Terminala statusar
 * (delivered/cancelled) och okända statusar ger ingen post — inboxen är
 * öppna arbetsobjekt.
 */
export function buildOrderInboxItem(order: {
  order_id: string;
  status: string;
  flow: string;
  total_ore?: number | null;
}): InboxItem | null {
  const next = nextOrderStatus(order.status);
  const eligible = isKnownOrderStatus(order.status) ? INBOX_ELIGIBLE[order.status] : undefined;
  if (!eligible || !next) return null;
  return createInboxItem({
    id: `order:${order.order_id}`,
    kind: eligible.kind,
    tenantId: "0pt",
    subject: `Order ${order.order_id.slice(0, 8)} — ${order.status} → ${next}`,
    priority: eligible.priority,
    createdAt: new Date().toISOString(),
    source: { system: "0pt", channel: "order-queue" },
    entity: { type: "order", id: order.order_id },
    actions: [{ id: "advance", label: `→ ${next}` }],
  });
}