import { describe, expect, it } from "vitest";
import { formatReceivedAt, withdrawalDeclarationLines, withdrawalReceiptEmailContent } from "./withdrawal";
import { escapeHtml } from "./escape-html";

const input = {
  name: "Erika Mustermann",
  orderNumber: "WH-2026-0042",
  email: "erika@example.com",
  message: null,
};

// 26.09.2026 12:03:07 UTC = 14:03:07 in Berlin (Sommerzeit)
const receivedAt = new Date(Date.UTC(2026, 8, 26, 12, 3, 7));

describe("formatReceivedAt", () => {
  it("formats in German local time with seconds", () => {
    expect(formatReceivedAt(receivedAt, "de")).toBe("26.09.2026, 14:03:07 Uhr (MESZ)");
  });

  it("uses winter time in winter", () => {
    expect(formatReceivedAt(new Date(Date.UTC(2026, 0, 5, 9, 0, 0)), "de")).toBe("05.01.2026, 10:00:00 Uhr (MEZ)");
  });

  it("formats in English with the German time zone", () => {
    expect(formatReceivedAt(receivedAt, "en")).toBe("26 September 2026, 14:03:07 (CEST, German time)");
  });
});

describe("withdrawalDeclarationLines", () => {
  it("states the withdrawal and the identifying data", () => {
    expect(withdrawalDeclarationLines(input, "de")).toEqual([
      "Hiermit widerrufe ich den Vertrag über die Bestellung WH-2026-0042.",
      "Name: Erika Mustermann",
      "E-Mail: erika@example.com",
    ]);
  });

  it("adds an optional message", () => {
    expect(withdrawalDeclarationLines({ ...input, message: "Falsche Sorte" }, "en")).toEqual([
      "I hereby withdraw from the contract for order WH-2026-0042.",
      "Name: Erika Mustermann",
      "Email: erika@example.com",
      "Message: Falsche Sorte",
    ]);
  });
});

describe("escapeHtml", () => {
  it("neutralises markup", () => {
    expect(escapeHtml(`<a href="x">'&'</a>`)).toBe("&lt;a href=&quot;x&quot;&gt;&#39;&amp;&#39;&lt;/a&gt;");
  });
});

describe("withdrawalReceiptEmailContent", () => {
  it("contains the declaration and the time of receipt in text and HTML", () => {
    const mail = withdrawalReceiptEmailContent(input, receivedAt, "de");
    expect(mail.subject).toBe("Eingangsbestätigung deines Widerrufs zu WH-2026-0042");
    expect(mail.text).toContain("Hiermit widerrufe ich den Vertrag über die Bestellung WH-2026-0042.");
    expect(mail.text).toContain("26.09.2026, 14:03:07 Uhr (MESZ)");
    expect(mail.bodyHtml).toContain("26.09.2026, 14:03:07 Uhr (MESZ)");
  });

  it("escapes user input in the HTML body and strips line breaks from the subject", () => {
    const mail = withdrawalReceiptEmailContent(
      { ...input, name: `<img src=x onerror=alert(1)>`, orderNumber: "A1\r\nBcc: x@y.z" },
      receivedAt,
      "de"
    );
    expect(mail.bodyHtml).not.toContain("<img");
    expect(mail.bodyHtml).toContain("&lt;img src=x onerror=alert(1)&gt;");
    expect(mail.subject).not.toMatch(/[\r\n]/);
  });
});