import assert from "node:assert/strict";
import { test } from "node:test";
import { decodeEvent } from "../src/lib/event-feed";
import type { SseMessage } from "../src/lib/sse";

test("decodeEvent parses an inflight snapshot", () => {
  const msg: SseMessage = {
    event: "message",
    data: JSON.stringify({
      type: "inflight",
      data: JSON.stringify({
        operation: "snapshot",
        requests: [{ id: "14", model: "Qwen3.8-27B-NVFP4", req_path: "/v1/chat/completions", elapsed_ms: 165510 }],
      }),
    }),
  };
  const ev = decodeEvent(msg);
  assert.ok(ev);
  assert.equal(ev.type, "inflight");
  if (ev.type === "inflight") {
    assert.equal(ev.operation, "snapshot");
    assert.equal(ev.requests.length, 1);
    assert.equal(ev.requests[0].model, "Qwen3.8-27B-NVFP4");
    assert.equal(ev.requests[0].elapsed_ms, 165510);
  }
});

test("decodeEvent parses an inflight add with a singular request field", () => {
  const msg: SseMessage = {
    event: "message",
    data: JSON.stringify({
      type: "inflight",
      data: JSON.stringify({ operation: "add", request: { id: "9", model: "A" } }),
    }),
  };
  const ev = decodeEvent(msg);
  assert.ok(ev && ev.type === "inflight");
  if (ev && ev.type === "inflight") {
    assert.equal(ev.operation, "add");
    assert.equal(ev.requests[0].model, "A");
  }
});

test("decodeEvent parses modelStatus", () => {
  const msg: SseMessage = {
    event: "message",
    data: JSON.stringify({
      type: "modelStatus",
      data: JSON.stringify([
        { id: "DeepSeek-V4-Flash-0731", state: "ready" },
        { id: "Qwen3.8-27B-NVFP4", state: "stopped" },
      ]),
    }),
  };
  const ev = decodeEvent(msg);
  assert.ok(ev && ev.type === "modelStatus");
  if (ev && ev.type === "modelStatus") {
    assert.equal(ev.models.length, 2);
    assert.equal(ev.models[0].state, "ready");
  }
});

test("decodeEvent returns null for unrelated or malformed events", () => {
  assert.equal(decodeEvent({ event: "message", data: JSON.stringify({ type: "logData", data: "{}" }) }), null);
  assert.equal(decodeEvent({ event: "message", data: "not json" }), null);
});