import assert from "node:assert/strict";
import { readFile } from "node:fs/promises";
import test from "node:test";
import {
  SessionProjection,
  buildBrowseUrl,
  buildStreamUrl,
  chooseSnapshotTransport,
  safeText,
} from "../../src/FinalFactory.Rendezvous.Server/Diagnostics/Assets/app.mjs";

const cursor = "rvs1.test-cursor";

function session(id, name = `Host ${id}`) {
  return {
    contractVersion: 1,
    listingId: `00000000-0000-0000-0000-${String(id).padStart(12, "0")}`,
    gameId: "space-game",
    environmentId: "smoke",
    regionId: "local",
    protocolVersion: 1,
    buildVersion: "1.0.0",
    displayName: name,
    visibility: "public",
    publisherTrustMode: "managedDedicated",
    capacity: { currentPlayers: 1, maximumPlayers: 8 },
    metadata: { mode: "online-coop" },
  };
}

function event(kind, values = {}) {
  return {
    contractVersion: 1,
    kind,
    cursor: values.cursor ?? cursor,
    session: values.session ?? null,
    listingId: values.listingId ?? null,
  };
}

test("snapshot and ordered deltas match the final public projection", () => {
  const projection = new SessionProjection(10);
  assert.equal(projection.replace([session(1)], cursor), "applied");
  assert.equal(projection.apply(event("sessionUpsert", {
    cursor: `${cursor}-2`,
    session: session(2),
  })), "applied");
  assert.equal(projection.apply(event("sessionUpsert", {
    cursor: `${cursor}-3`,
    session: session(1, "Updated host"),
  })), "applied");
  assert.equal(projection.apply(event("sessionRemove", {
    cursor: `${cursor}-4`,
    listingId: session(2).listingId,
  })), "applied");

  assert.deepEqual(
    projection.sessions().map((entry) => entry.session.displayName),
    ["Updated host"],
  );
  assert.equal(projection.cursor, `${cursor}-4`);
});

test("reset, malformed events, and a partial snapshot fail closed", () => {
  const projection = new SessionProjection(2);
  assert.equal(projection.replace([session(1)], cursor, true), "applied");
  assert.equal(projection.apply(event("sessionRemove", {
    listingId: session(1).listingId,
  })), "refresh");
  assert.equal(projection.apply(event("reset")), "reset");
  assert.equal(projection.apply({ kind: "sessionUpsert" }), "invalid");
  assert.equal(projection.replace([session(1), session(2), session(3)], cursor), "overflow");
});

test("bursts coalesce by listing identity and memory stays bounded", () => {
  const projection = new SessionProjection(2);
  assert.equal(projection.replace([], cursor), "applied");
  for (let index = 0; index < 1_000; index += 1) {
    assert.equal(projection.apply(event("sessionUpsert", {
      cursor: `${cursor}-${index}`,
      session: session(1, `Host ${index}`),
    })), "applied");
  }
  assert.equal(projection.sessions().length, 1);
  assert.equal(projection.sessions()[0].session.displayName, "Host 999");
  assert.equal(projection.apply(event("sessionUpsert", { session: session(2) })), "applied");
  assert.equal(projection.apply(event("sessionUpsert", { session: session(3) })), "overflow");
  assert.equal(projection.sessions().length, 2);
});

test("requests are fixed same-origin paths with an exact configured filter", () => {
  const filter = {
    gameId: "space-game",
    environmentId: "smoke",
    protocolVersion: 1,
    regionId: "local",
    excludeFull: true,
  };
  const browse = buildBrowseUrl(filter);
  const stream = buildStreamUrl(filter, cursor);
  assert.match(browse, /^\/v1\/sessions\?/u);
  assert.match(stream, /^\/v1\/sessions\/stream\?/u);
  assert.match(browse, /gameId=space-game/u);
  assert.match(browse, /environmentId=smoke/u);
  assert.match(stream, /streamCursor=rvs1.test-cursor/u);
  assert.doesNotMatch(browse, /https?:/u);
  assert.doesNotMatch(stream, /https?:/u);
});

test("snapshot transport preserves deliberate polling and bounds partial snapshots", () => {
  assert.equal(chooseSnapshotTransport(false, false), "stream");
  assert.equal(chooseSnapshotTransport(true, false), "boundedPolling");
  assert.equal(chooseSnapshotTransport(false, true), "pollingOnly");
  assert.equal(chooseSnapshotTransport(true, true), "pollingOnly");
});

test("hostile display data remains literal text and no unsafe DOM sink exists", async () => {
  const payload = `<img src=x onerror=alert(1)><style>body{display:none}</style><a href=//evil>go</a>`;
  assert.equal(safeText(payload, 200), payload);
  const source = await readFile(new URL(
    "../../src/FinalFactory.Rendezvous.Server/Diagnostics/Assets/app.mjs",
    import.meta.url,
  ), "utf8");
  for (const forbidden of [
    "innerHTML",
    "outerHTML",
    "insertAdjacentHTML",
    "document.write",
    "eval(",
    "new Function",
    "window.location",
  ]) {
    assert.equal(source.includes(forbidden), false, `unsafe browser sink: ${forbidden}`);
  }
});