import { describe, expect, it } from "vitest";
import {
  categorizeAttachment,
  groupAttachments,
} from "@/lib/attachments";

describe("categorizeAttachment", () => {
  it("maps po-document keys to the submission group", () => {
    expect(categorizeAttachment("po-document/po123/1700-invoice.pdf")).toBe("submission");
  });

  it("maps receipt keys to the delivery group", () => {
    expect(categorizeAttachment("receipt/po123/1700-delivery.pdf")).toBe("delivery");
  });

  it("maps payment keys to the payment group", () => {
    expect(categorizeAttachment("payment-document/po123/proof.pdf")).toBe("payment");
    expect(categorizeAttachment("payment/po123/proof.pdf")).toBe("payment");
  });

  it("falls back to other for unknown prefixes", () => {
    expect(categorizeAttachment("something-else/x.pdf")).toBe("other");
    expect(categorizeAttachment("no-slash")).toBe("other");
  });
});

describe("groupAttachments", () => {
  const doc = (id: string, storageKey: string) => ({ id, storageKey });

  it("groups documents by lifecycle stage in canonical order", () => {
    const groups = groupAttachments([
      doc("a", "receipt/po1/delivery.pdf"),
      doc("b", "po-document/po1/invoice.pdf"),
      doc("c", "po-document/po1/quote.pdf"),
    ]);

    expect(groups.map((g) => g.meta.key)).toEqual(["submission", "delivery"]);
    expect(groups[0].items.map((d) => d.id)).toEqual(["b", "c"]);
    expect(groups[1].items.map((d) => d.id)).toEqual(["a"]);
  });

  it("omits empty groups", () => {
    const groups = groupAttachments([doc("a", "po-document/po1/invoice.pdf")]);
    expect(groups).toHaveLength(1);
    expect(groups[0].meta.key).toBe("submission");
  });

  it("returns an empty array when there are no documents", () => {
    expect(groupAttachments([])).toEqual([]);
  });

  it("preserves input order within a group", () => {
    const groups = groupAttachments([
      doc("first", "receipt/po1/a.pdf"),
      doc("second", "receipt/po1/b.pdf"),
    ]);
    expect(groups[0].items.map((d) => d.id)).toEqual(["first", "second"]);
  });

  it("collects unknown prefixes into the other group last", () => {
    const groups = groupAttachments([
      doc("x", "mystery/po1/file.pdf"),
      doc("y", "po-document/po1/invoice.pdf"),
    ]);
    expect(groups.map((g) => g.meta.key)).toEqual(["submission", "other"]);
  });
});