import type {
  WorkOrderUplift,
  UpliftSummary,
  WorkOrderUpliftStatus,
} from "@/domain/work-orders/types/work-order-uplift";
import type { WorkOrderTableRow } from "@/domain/work-orders/types/work-order-table-row";

export function formatUpliftMoney(value: number | null | undefined): string {
  if (value == null || Number.isNaN(value)) {
    return "—";
  }
  return new Intl.NumberFormat("en-US", {
    style: "currency",
    currency: "USD",
    maximumFractionDigits: 0,
  }).format(value);
}

const STATUS_LABELS: Record<WorkOrderUpliftStatus, string> = {
  pending: "Pending",
  approved: "Approved",
  auto_approved: "Auto",
  rejected: "Rejected",
  cancelled: "Cancelled",
  revoked: "Revoked",
};

export function formatUpliftStatusLabel(status: WorkOrderUpliftStatus): string {
  return STATUS_LABELS[status];
}

export function getUpliftCellLabel(summary: UpliftSummary): string | null {
  if (!summary.hasUplift && summary.pendingCount <= 0) {
    return null;
  }
  if (summary.pendingCount > 0) {
    return summary.pendingCount === 1 ? "1 Pending" : `${summary.pendingCount} Pending`;
  }
  if (summary.primaryStatus) {
    const label = formatUpliftStatusLabel(summary.primaryStatus);
    if (summary.amount != null) {
      return `${label} ${formatUpliftMoney(summary.amount)}`;
    }
    return label;
  }
  if (summary.hasUplift) {
    return "Uplift";
  }
  return null;
}

export function getUpliftStatusPillStyle(status: WorkOrderUpliftStatus): {
  background: string;
  color: string;
} {
  switch (status) {
    case "pending":
      return { background: "var(--status-pending-bg)", color: "var(--status-pending-text)" };
    case "approved":
      return { background: "var(--status-success-bg, #DCFCE7)", color: "var(--color-success)" };
    case "auto_approved":
      return { background: "var(--color-primary-tint)", color: "var(--color-primary)" };
    case "rejected":
      return { background: "#FEE2E2", color: "#B91C1C" };
    case "cancelled":
    case "revoked":
      return { background: "var(--color-bg-muted)", color: "var(--color-text-muted)" };
    default:
      return { background: "var(--color-bg-muted)", color: "var(--color-text-muted)" };
  }
}

export function isWorkOrderUpliftsReadOnly(status: WorkOrderTableRow["status"]): boolean {
  return status === "Completed" || status === "Canceled";
}

export function canOpenUpliftsDialog(
  summary: UpliftSummary,
  status: WorkOrderTableRow["status"],
): boolean {
  if (summary.hasUplift || summary.pendingCount > 0) {
    return true;
  }
  return !isWorkOrderUpliftsReadOnly(status);
}

export function canRevokeWorkOrderUplift(
  uplift: Pick<WorkOrderUplift, "status" | "requestedById">,
  currentUserId: string | number | null | undefined,
): boolean {
  if (uplift.status !== "auto_approved") {
    // SH-214/SH-212: admin-approved revoke lives on Uplift Approvals, not the WO dialog.
    return false;
  }
  return (
    currentUserId != null &&
    currentUserId !== "" &&
    uplift.requestedById != null &&
    String(uplift.requestedById) === String(currentUserId)
  );
}

export function upliftRevokeRequiresReason(status: WorkOrderUpliftStatus): boolean {
  return status === "approved";
}

export const UPLIFT_STANDARD_ALLOWANCE_USD = 500;
export const UPLIFT_EMERGENCY_ALLOWANCE_USD = 5000;

export function getUpliftAllowanceCap(workOrderType: string): number {
  return workOrderType === "Emergency"
    ? UPLIFT_EMERGENCY_ALLOWANCE_USD
    : UPLIFT_STANDARD_ALLOWANCE_USD;
}

export function hasOpenWorkOrderUplift(
  uplifts: ReadonlyArray<Pick<WorkOrderUplift, "status">>,
): boolean {
  return uplifts.some((uplift) => uplift.status === "pending");
}

export function getRemainingUpliftAllowance(
  workOrderType: string,
  uplifts: ReadonlyArray<Pick<WorkOrderUplift, "status" | "amount">>,
): number {
  const consumed = uplifts
    .filter((uplift) => uplift.status === "auto_approved")
    .reduce((sum, uplift) => sum + uplift.amount, 0);
  return Math.max(0, getUpliftAllowanceCap(workOrderType) - consumed);
}