import { describe, it, expect } from "vitest";
import { cn, displayContactName } from "./utils";

describe("cn", () => {
  it("merges class names", () => {
    expect(cn("foo", "bar")).toBe("foo bar");
  });

  it("filters falsy values", () => {
    expect(cn("foo", false, null, undefined, "", "bar")).toBe("foo bar");
  });

  it("dedupes conflicting tailwind classes", () => {
    // twMerge keeps the last conflicting utility
    expect(cn("px-2", "px-4")).toBe("px-4");
  });

  it("handles conditional class objects via clsx", () => {
    expect(cn("base", { active: true, disabled: false })).toBe("base active");
  });

  it("returns empty string for no args", () => {
    expect(cn()).toBe("");
  });
});

describe("displayContactName", () => {
  // The contact_name field is populated by an LLM during email intake;
  // it historically contains stray whitespace that produces visible
  // "miss" symptoms on the orders list (a dangling separator dot with
  // no actual name). These tests pin the sanitiser's contract.

  it("returns empty string for null / undefined / non-strings", () => {
    expect(displayContactName(null)).toBe("");
    expect(displayContactName(undefined)).toBe("");
    expect(displayContactName("")).toBe("");
  });

  it("trims leading and trailing whitespace", () => {
    expect(displayContactName("  Neville Benadé  ")).toBe("Neville Benadé");
  });

  it("collapses internal whitespace runs (including newlines) to a single space", () => {
    expect(displayContactName("Neville   Benadé")).toBe("Neville Benadé");
    expect(displayContactName("Neville\nBenadé")).toBe("Neville Benadé");
    expect(displayContactName("Neville\t\n Benadé")).toBe("Neville Benadé");
  });

  it("returns empty string for whitespace-only input", () => {
    expect(displayContactName("\n")).toBe("");
    expect(displayContactName("   ")).toBe("");
    expect(displayContactName("\n\n  \t")).toBe("");
  });

  it("preserves a non-empty name untouched", () => {
    expect(displayContactName("Neville Benadé")).toBe("Neville Benadé");
    expect(displayContactName("Swanepoel, Ms. Joey")).toBe("Swanepoel, Ms. Joey");
  });

  it("handles the real-world LLM trim case", () => {
    // The newlines are exactly what the n8n AI Agent has historically
    // returned (see docs/audit/order-pipeline-investigation-2026-08-20.md §3).
    expect(displayContactName("Nbenade\n")).toBe("Nbenade");
    expect(displayContactName("N. Benade\n")).toBe("N. Benade");
    expect(displayContactName("Drilling Technical Services (PTY) Ltd\n")).toBe(
      "Drilling Technical Services (PTY) Ltd",
    );
  });
});