import { describe, expect, it } from "vitest";
import { decodeCursor, encodeCursor, MAX_COMMENT_IMAGE_BYTES, parseCommentForm, parseTarget } from "./validation";

const id = "11111111-1111-4111-8111-111111111111";
function form(text = "hello", count = 0, bytes = 1, type = "image/png") {
  const value = new FormData();
  value.set("text", text);
  for (let i = 0; i < count; i++) value.append("image", new File([new Uint8Array(bytes)], `${i}.png`, { type }));
  return value;
}
describe("comment form limits", () => {
  it("accepts text and image-only comments", () => {
    expect(parseCommentForm(form("  hello  ")).text).toBe("hello");
    expect(parseCommentForm(form("", 5)).files).toHaveLength(5);
    expect(() => parseCommentForm(form(""))).toThrow("empty-comment");
  });
  it("enforces the combined retained and new image limit", () => {
    expect(() => parseCommentForm(form("", 6))).toThrow("invalid-comment");
    const value = form("editing", 5);
    value.set("version", "1"); value.append("keepImageId", id);
    expect(() => parseCommentForm(value, true)).toThrow("invalid-comment");
  });
  it("accepts exactly ten MiB and rejects one additional byte", () => {
    expect(parseCommentForm(form("", 1, MAX_COMMENT_IMAGE_BYTES)).files).toHaveLength(1);
    expect(() => parseCommentForm(form("", 1, MAX_COMMENT_IMAGE_BYTES + 1))).toThrow("image-too-large");
  });
  it.each(["video/mp4", "image/svg+xml", "image/gif", "application/octet-stream"])("rejects %s", (type) => {
    expect(() => parseCommentForm(form("", 1, 1, type))).toThrow("unsupported-image-type");
  });
  it("enforces text, version, reply, and retained-image validation", () => {
    expect(() => parseCommentForm(form("x".repeat(4001)))).toThrow("invalid-comment");
    const value = form(); value.set("version", "0");
    expect(() => parseCommentForm(value, true)).toThrow("invalid-comment");
    value.set("version", "1"); value.set("replyToId", "bad");
    expect(() => parseCommentForm(value, true)).toThrow("invalid-comment");
    value.delete("replyToId"); value.append("keepImageId", id); value.append("keepImageId", id);
    expect(() => parseCommentForm(value, true)).toThrow("invalid-comment");
  });
});
describe("discussion identities and cursors", () => {
  it("validates guide UUIDs and schedule IDs", () => {
    expect(parseTarget(`guide:${id}`)).toEqual({ kind: "guide", id });
    expect(parseTarget("stygian:5269001")).toEqual({ kind: "stygian", id: 5269001 });
    for (const value of ["guide:invalid", "stygian:0", "stygian:NaN", "stygian:-1", "stygian:9999999999"]) expect(() => parseTarget(value)).toThrow("invalid-target");
  });
  it("round-trips keyset cursors and rejects arbitrary input", () => {
    const cursor = { time: "2026-10-07T00:00:00.000Z", id, likes: 3 };
    expect(decodeCursor(encodeCursor(cursor))).toEqual(cursor);
    expect(() => decodeCursor("invalid")).toThrow("invalid-cursor");
    expect(() => decodeCursor(encodeCursor({ ...cursor, likes: -1 }))).toThrow("invalid-cursor");
  });
});