import type { Freight } from "@edr/types";

export interface ApprovalProgressSummary {
  label: string;
  detail: string;
  complete: boolean;
}

function nextPending(
  steps: Freight.IContractApprovalStep[],
): Freight.IContractApprovalStep | undefined {
  return steps.find((s) => s.status === "PENDING");
}

/** Compact approval-chain summary for contract list rows (mirrors bookings). */
export function formatContractApprovalProgress(
  status: string,
  steps?: Freight.IContractApprovalStep[] | null,
): ApprovalProgressSummary {
  const sorted = [...(steps ?? [])].sort((a, b) => a.stepOrder - b.stepOrder);

  if (sorted.length === 0) {
    if (status === "SUBMITTED") {
      return {
        label: "Awaiting accept",
        detail: "Staff must accept intake",
        complete: false,
      };
    }
    if (
      status === "PENDING_APPROVAL" ||
      status === "APPROVED_PENDING_SIGNATURE"
    ) {
      return {
        label: "No steps",
        detail: "Approval chain not started",
        complete: false,
      };
    }
    if (
      [
        "APPROVED",
        "CONTRACT_READY",
        "SIGNED_CUSTOMER",
        "FULLY_EXECUTED",
        "CONTRACT_ACTIVE",
        "CLEARANCE_READY_FOR_BOOKING",
        "ACTIVE_SHIPMENT_IN_PROGRESS",
        "CONTRACT_CLOSED",
      ].includes(status)
    ) {
      return {
        label: "Approved",
        detail: "Internal approval complete",
        complete: true,
      };
    }
    return { label: "—", detail: "", complete: false };
  }

  const approved = sorted.filter((s) => s.status === "APPROVED").length;
  const total = sorted.length;
  const next = nextPending(sorted);

  if (!next && approved === total) {
    return {
      label: `${approved}/${total} done`,
      detail: sorted.map((s) => `${s.requiredRole} ✓`).join(" · "),
      complete: true,
    };
  }

  if (next) {
    return {
      label: `${approved}/${total}`,
      detail: `Next: ${next.requiredRole} (step ${next.stepOrder})`,
      complete: false,
    };
  }

  return {
    label: `${approved}/${total}`,
    detail: sorted.map((s) => `${s.requiredRole}: ${s.status}`).join(" · "),
    complete: approved === total,
  };
}