import { describe, expect, it } from "vitest";

import {
  isTicketExpired,
  normalizeHexDigest,
  parseDocverTicket,
  timingSafeEqualHex,
} from "@/utils/docver-ticket";

// PLAN-ADDIN-AUTH.md §4 — pure ล้วนไม่แตะ env/DB อะไรเลย
// รูป ticket_data อ้างอิงจากตัว stamp จริงของกลุ่ม template (app/api/template/
// render/route.ts applyTemplate — key เรียงตามตัวอักษรหลังเติม exp)

const VALID = JSON.stringify({
  exp: 1793067433,
  fid: "T12_FD155_3s-long_ZZZ",
  tid: "T12",
  uid: "oom",
  uname: "สรวิชญ์",
});

function ok<T>(result: { ok: boolean } & T): asserts result is { ok: true } & T {
  expect(result.ok).toBe(true);
}

describe("parseDocverTicket", () => {
  it("ticket ครบทุก field = แกะได้ (trim ค่า string)", () => {
    const result = parseDocverTicket(VALID);
    ok(result);
    expect(result.ticket).toEqual({
      exp: 1793067433,
      fid: "T12_FD155_3s-long_ZZZ",
      tid: "T12",
      uid: "oom",
      uname: "สรวิชญ์",
    });
  });

  it("tid optional — ไม่ส่ง/ส่งค่าว่าง = null", () => {
    const noTid = parseDocverTicket(JSON.stringify({ exp: 1, fid: "f", uid: "u", uname: "n" }));
    ok(noTid);
    expect(noTid.ticket.tid).toBeNull();
    const blankTid = parseDocverTicket(
      JSON.stringify({ exp: 1, fid: "f", tid: "   ", uid: "u", uname: "n" }),
    );
    ok(blankTid);
    expect(blankTid.ticket.tid).toBeNull();
  });

  it("JSON ไม่ผ่าน / ไม่ใช่ object (array/string/null) = ไม่ผ่าน", () => {
    for (const raw of ["not json", "[1,2]", '"text"', "null", "{}"]) {
      expect(parseDocverTicket(raw).ok, raw).toBe(false);
    }
  });

  it("field อื่นนอก allowlist = ไม่ผ่าน (กัน typo/field หลุดจาก spec)", () => {
    const result = parseDocverTicket(JSON.stringify({ exp: 1, fid: "f", uid: "u", uname: "n", oops: 1 }));
    expect(result.ok).toBe(false);
    if (!result.ok) expect(result.error).toContain("oops");
  });

  it("exp ไม่ใช่จำนวนเต็ม / หาย / uid-uname-fid หายหรือไม่ใช่ string = ไม่ผ่าน", () => {
    for (const ticket of [
      { fid: "f", uid: "u", uname: "n" }, // ไม่มี exp
      { exp: "1793067433", fid: "f", uid: "u", uname: "n" }, // exp เป็น string
      { exp: 1.5, fid: "f", uid: "u", uname: "n" }, // exp ไม่ใช่ integer
      { exp: 1, uid: "u", uname: "n" }, // ไม่มี fid
      { exp: 1, fid: "f", uname: "n" }, // ไม่มี uid
      { exp: 1, fid: "f", uid: "u" }, // ไม่มี uname
      { exp: 1, fid: "", uid: "u", uname: "n" }, // fid ว่าง
      { exp: 1, fid: 3, uid: "u", uname: "n" }, // fid เป็น number
      { exp: 1, fid: "f", uid: "u", uname: "n", tid: 12 }, // tid ไม่ใช่ string
    ]) {
      expect(parseDocverTicket(JSON.stringify(ticket)).ok, JSON.stringify(ticket)).toBe(false);
    }
  });

  it("ความยาวเกิน cap: uid > 100 / uname > 200 / fid > 200 / tid > 100 = ไม่ผ่าน", () => {
    expect(parseDocverTicket(JSON.stringify({ exp: 1, fid: "f", uid: "u".repeat(101), uname: "n" })).ok).toBe(false);
    expect(parseDocverTicket(JSON.stringify({ exp: 1, fid: "f", uid: "u", uname: "n".repeat(201) })).ok).toBe(false);
    expect(parseDocverTicket(JSON.stringify({ exp: 1, fid: "f".repeat(201), uid: "u", uname: "n" })).ok).toBe(false);
    expect(parseDocverTicket(JSON.stringify({ exp: 1, fid: "f", uid: "u", uname: "n", tid: "t".repeat(101) })).ok).toBe(false);
  });
});

describe("isTicketExpired", () => {
  it("exp อนาคต = ยังไม่หมด · exp ตรง now พอดี/อดีต = หมดแล้ว", () => {
    const now = 1_793_000_000;
    expect(isTicketExpired(now + 1, now)).toBe(false);
    expect(isTicketExpired(now, now)).toBe(true);
    expect(isTicketExpired(now - 1, now)).toBe(true);
  });
});

describe("normalizeHexDigest", () => {
  const HEX64 = "1dc53fbd48410845c895ddb841a8fe4ad93da413126fae9c688202e57f2baaa9";

  it("hex lowercase ครบ 64 = ผ่าน · trim และ uppercase ก็ normalize ให้", () => {
    expect(normalizeHexDigest(HEX64)).toBe(HEX64);
    expect(normalizeHexDigest(`  ${HEX64}  `)).toBe(HEX64);
    expect(normalizeHexDigest(HEX64.toUpperCase())).toBe(HEX64);
  });

  it("รูปไม่ใช่ (สั้น/ยาว/ไม่ใช่ hex/ว่าง) = null", () => {
    for (const bad of ["", "abc", `${HEX64}00`, `g${HEX64.slice(1)}`, "   "]) {
      expect(normalizeHexDigest(bad), bad).toBeNull();
    }
  });
});

describe("timingSafeEqualHex", () => {
  it("ค่าเท่ากัน = true ต่างกัน = false · ความยาวไม่เท่า = false ทันที", () => {
    const a = "ab".repeat(32);
    expect(timingSafeEqualHex(a, a)).toBe(true);
    expect(timingSafeEqualHex(a, "cd".repeat(32))).toBe(false);
    expect(timingSafeEqualHex(a, "ab")).toBe(false);
  });
});