// Work order status machine (client-safe: no server imports).
// Server enforcement lives in src/server/services/work-orders/transition.ts,
// which MUST call canTransition()/requiredPermission() — never update status directly.

export const WORK_ORDER_STATUSES = [
  "draft",
  "review_required",
  "planned",
  "assigned",
  "accepted",
  "en_route",
  "in_progress",
  "paused",
  "waiting_material",
  "daily_report_created",
  "technically_completed",
  "signature_pending",
  "in_review",
  "released_for_billing",
  "billed",
  "cancelled",
] as const;

export type WorkOrderStatus = (typeof WORK_ORDER_STATUSES)[number];

const T: Record<WorkOrderStatus, readonly WorkOrderStatus[]> = {
  draft: ["review_required", "planned", "assigned", "cancelled"],
  review_required: ["planned", "assigned", "cancelled"],
  planned: ["assigned", "cancelled"],
  assigned: ["accepted", "en_route", "in_progress", "planned", "cancelled"],
  accepted: ["en_route", "in_progress", "assigned", "cancelled"],
  en_route: ["in_progress", "cancelled"],
  in_progress: ["paused", "waiting_material", "daily_report_created", "technically_completed", "cancelled"],
  paused: ["in_progress", "en_route", "cancelled"],
  waiting_material: ["in_progress", "en_route", "cancelled"],
  daily_report_created: ["en_route", "in_progress", "cancelled"],
  technically_completed: ["signature_pending", "in_review", "in_progress", "cancelled"],
  signature_pending: ["in_review", "cancelled"],
  in_review: ["released_for_billing", "in_progress", "cancelled"],
  released_for_billing: ["billed", "in_review"],
  billed: [],
  cancelled: [],
};

export function allowedTransitions(from: WorkOrderStatus): readonly WorkOrderStatus[] {
  return T[from];
}

export function canTransition(from: WorkOrderStatus, to: WorkOrderStatus): boolean {
  return T[from].includes(to);
}

/** Permission required for a transition (server additionally checks work order scope for field roles). */
export function requiredPermission(from: WorkOrderStatus, to: WorkOrderStatus): string {
  if (to === "cancelled") return "work_order:cancel";
  if (to === "released_for_billing" || to === "billed") return "work_order:release_billing";
  if (from === "released_for_billing" && to === "in_review") return "work_order:release_billing";
  if (from === "in_review" && to === "in_progress") return "report:approve_team"; // or report:approve (checked server-side)
  if (["draft", "review_required", "planned"].includes(from)) return to === "assigned" ? "work_order:assign" : "work_order:write";
  if (from === "assigned" && to === "planned") return "work_order:assign";
  return "field:execute";
}

/** Statuses in which field users may record time/material/photos/notes. */
export const FIELD_EDITABLE: readonly WorkOrderStatus[] = [
  "assigned",
  "accepted",
  "en_route",
  "in_progress",
  "paused",
  "waiting_material",
  "daily_report_created",
  "technically_completed",
  "signature_pending",
];

export const OPEN_STATUSES: readonly WorkOrderStatus[] = WORK_ORDER_STATUSES.filter(
  (s) => !["billed", "cancelled", "released_for_billing"].includes(s),
);

/** UI groups per Brandbook §12.3 — label keys live in messages/<locale>/workOrders.json → statusGroup.<key>. */
export const STATUS_GROUP: Record<WorkOrderStatus, StatusGroup> = {
  draft: "new",
  review_required: "new",
  planned: "planned",
  assigned: "planned",
  accepted: "planned",
  en_route: "en_route",
  in_progress: "in_progress",
  paused: "in_progress",
  waiting_material: "in_progress",
  daily_report_created: "in_progress",
  technically_completed: "documentation_incomplete",
  signature_pending: "documentation_incomplete",
  in_review: "in_review",
  released_for_billing: "ready_for_billing",
  billed: "billed",
  cancelled: "cancelled",
};

export type StatusGroup =
  | "new"
  | "planned"
  | "en_route"
  | "in_progress"
  | "documentation_incomplete"
  | "in_review"
  | "ready_for_billing"
  | "billed"
  | "cancelled";

/** Semantic tone for badges (always combined with text, Brandbook §11.4). */
export const STATUS_GROUP_TONE: Record<StatusGroup, "neutral" | "info" | "accent" | "warning" | "success" | "danger"> = {
  new: "neutral",
  planned: "info",
  en_route: "accent",
  in_progress: "accent",
  documentation_incomplete: "warning",
  in_review: "info",
  ready_for_billing: "success",
  billed: "success",
  cancelled: "danger",
};

export type CompletionBlocker =
  | { kind: "checklist_item"; itemId: string; label: string }
  | { kind: "photo_requirement"; requirementId: string; label: string }
  | { kind: "running_session"; sessionId: string; userId: string }
  | { kind: "missing_field"; field: string };