import assert from "node:assert/strict";
import { readFile } from "node:fs/promises";
import test from "node:test";

const connectionStateSource = await readFile(new URL("../static/js/connection-state.js", import.meta.url), "utf8");
const connectionState = await import(`data:text/javascript;base64,${Buffer.from(connectionStateSource).toString("base64")}`);
const {
  CONNECTION_ERROR_AFTER_RECONNECT_ATTEMPTS,
  reconnectStatus,
} = connectionState;

test("temporary reconnects remain reconnecting", () => {
  for (let attempt = 0; attempt < CONNECTION_ERROR_AFTER_RECONNECT_ATTEMPTS; attempt += 1) {
    assert.equal(reconnectStatus(attempt, true), "reconnecting");
  }
});

test("persistent reconnect failures become an error while online", () => {
  assert.equal(reconnectStatus(CONNECTION_ERROR_AFTER_RECONNECT_ATTEMPTS, true), "error");
  assert.equal(reconnectStatus(CONNECTION_ERROR_AFTER_RECONNECT_ATTEMPTS + 10, true), "error");
});

test("offline devices stay in reconnecting state instead of a hard error", () => {
  assert.equal(reconnectStatus(CONNECTION_ERROR_AFTER_RECONNECT_ATTEMPTS + 10, false), "reconnecting");
});

test("frontend exceptions do not overwrite the connection indicator", async () => {
  const editorSource = await readFile(new URL("../static/js/note-editor.js", import.meta.url), "utf8");
  assert.doesNotMatch(editorSource, /setStatus\([^\n]*Application error/);
  assert.match(editorSource, /window\.addEventListener\("error", \(\) => notifyFrontendError\(\)\)/);
  assert.match(editorSource, /window\.addEventListener\("unhandledrejection", \(\) => notifyFrontendError\(\)\)/);
});