/**
 * pdf-import.test.ts — coverage for the parser surface only.
 *
 * The actual pdf.js rendering + Aztec scan loop in importCodexPDF requires
 * a DOM (HTMLCanvasElement) which vitest's node environment does not provide.
 * End-to-end PDF round-trip lives in the manual Codex verification matrix
 * (see peach_codex_reliability.md §5.2). Here we only test the bits we can:
 * the defensive envelope parser.
 */

import { describe, expect, it } from "vitest";
import { parseChunkEnvelope } from "./pdf-import";

describe("parseChunkEnvelope", () => {
  it("parses a well-formed envelope", () => {
    const env = {
      v: 2,
      c: "PX-TEST-1234",
      i: 0,
      t: 15,
      p: false,
      d: "AAAA",
      h: "ABCDEF1234567890ABCDEF1234567890",
    };
    expect(parseChunkEnvelope(JSON.stringify(env))).toEqual(env);
  });

  it("returns null for non-JSON input", () => {
    expect(parseChunkEnvelope("not json at all")).toBeNull();
  });

  it("returns null for non-Peach JSON", () => {
    expect(parseChunkEnvelope(JSON.stringify({ hello: "world" }))).toBeNull();
  });

  it("returns null when version is missing", () => {
    expect(
      parseChunkEnvelope(
        JSON.stringify({ c: "PX", i: 0, t: 5, p: false, d: "A", h: "A" }),
      ),
    ).toBeNull();
  });

  it("returns null when fields have the wrong types", () => {
    expect(
      parseChunkEnvelope(
        JSON.stringify({
          v: 2,
          c: "PX",
          i: "0", // should be number
          t: 5,
          p: false,
          d: "A",
          h: "A",
        }),
      ),
    ).toBeNull();
  });

  it("returns null for v=1 envelopes", () => {
    expect(
      parseChunkEnvelope(
        JSON.stringify({
          v: 1,
          c: "PX",
          i: 0,
          t: 5,
          p: false,
          d: "A",
          h: "A",
        }),
      ),
    ).toBeNull();
  });
});