import type { WorkOrderTableRow } from "@/domain/work-orders/types/work-order-table-row";

const PENDING_UPLIFT_GAP = "Pending uplift approval";

/** Fields required to evaluate whether a WO may be marked Completed or generate a comp doc. */
export type WoClosabilityInput = Pick<WorkOrderTableRow, "upliftSummary" | "hasPendingUplift">;

export function hasPendingUplift(row: WoClosabilityInput): boolean {
  if (row.hasPendingUplift === true) {
    return true;
  }
  return (row.upliftSummary?.pendingCount ?? 0) > 0;
}

/**
 * Returns human-readable labels for requirements still missing before Completed is allowed.
 * Empty array means the WO may be marked Completed (for closability gates implemented here).
 */
export function getClosabilityGaps(row: WoClosabilityInput): string[] {
  if (hasPendingUplift(row)) {
    return [PENDING_UPLIFT_GAP];
  }
  return [];
}

export function formatClosabilityMissingTitle(gaps: string[]): string {
  return `Missing: ${gaps.join(", ")}`;
}

export type CompDocGateResult = { allowed: true } | { allowed: false; reason: string };

/**
 * Gate for completion-document generation. CompDocDialog (not yet on `dev`) should call this
 * before opening generate flow and surface `reason` when blocked.
 */
export function canGenerateCompDoc(row: WoClosabilityInput): CompDocGateResult {
  const gaps = getClosabilityGaps(row);
  if (gaps.length > 0) {
    return { allowed: false, reason: formatClosabilityMissingTitle(gaps) };
  }
  return { allowed: true };
}