import test from "node:test";
import assert from "node:assert/strict";
import { spawn } from "node:child_process";
import { mkdtempSync, rmSync } from "node:fs";
import { createServer } from "node:net";
import { tmpdir } from "node:os";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";

const projectRoot = dirname(dirname(fileURLToPath(import.meta.url)));

function reservePort() {
  return new Promise((resolve, reject) => {
    const server = createServer();
    server.once("error", reject);
    server.listen(0, "127.0.0.1", () => {
      const address = server.address();
      const port = typeof address === "object" && address ? address.port : 0;
      server.close((error) => error ? reject(error) : resolve(port));
    });
  });
}

function waitForServer(child, timeoutMs = 10000) {
  return new Promise((resolve, reject) => {
    let output = "";
    const timeout = setTimeout(() => {
      reject(new Error(`Server startup timed out. Output:\n${output}`));
    }, timeoutMs);
    const onData = (chunk) => {
      output += chunk.toString();
      if (output.includes("RC Timing server listening")) {
        clearTimeout(timeout);
        child.stdout.off("data", onData);
        resolve();
      }
    };
    child.stdout.on("data", onData);
    child.stderr.on("data", (chunk) => {
      output += chunk.toString();
    });
    child.once("exit", (code, signal) => {
      clearTimeout(timeout);
      reject(new Error(`Server exited before startup (code=${code}, signal=${signal}). Output:\n${output}`));
    });
  });
}

function stopServer(child) {
  if (child.exitCode !== null || child.signalCode !== null) {
    return Promise.resolve();
  }
  return new Promise((resolve) => {
    const timeout = setTimeout(() => {
      child.kill("SIGKILL");
    }, 3000);
    child.once("exit", () => {
      clearTimeout(timeout);
      resolve();
    });
    child.kill("SIGTERM");
  });
}

test("SQLite API persists state, passings, and overlay session results", { timeout: 20000 }, async () => {
  const dataDir = mkdtempSync(join(tmpdir(), "live-rc-test-"));
  const port = await reservePort();
  const baseUrl = `http://127.0.0.1:${port}`;
  const child = spawn(process.execPath, [join(projectRoot, "server.js")], {
    cwd: projectRoot,
    env: {
      ...process.env,
      HOST: "127.0.0.1",
      PORT: String(port),
      RC_TIMING_DATA_DIR: dataDir,
      RC_TIMING_PID_FILE: "",
    },
    stdio: ["ignore", "pipe", "pipe"],
  });

  try {
    await waitForServer(child);

    const healthResponse = await fetch(`${baseUrl}/api/health`);
    const health = await healthResponse.json();
    assert.equal(healthResponse.status, 200);
    assert.equal(health.ok, true);
    assert.equal(health.dbPath, join(dataDir, "rc_timing.sqlite"));

    const emptyResponse = await fetch(`${baseUrl}/api/state`);
    assert.deepEqual(await emptyResponse.json(), { state: null, updatedAt: null });

    const initialState = {
      events: [{ id: "event_1", name: "Club race" }],
      sessions: [{ id: "session_1", eventId: "event_1", name: "A final" }],
      resultsBySession: {},
    };
    const saveResponse = await fetch(`${baseUrl}/api/state`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify(initialState),
    });
    const savePayload = await saveResponse.json();
    assert.equal(saveResponse.status, 200);
    assert.equal(savePayload.ok, true);
    assert.equal(typeof savePayload.updatedAt, "string");

    const storedResponse = await fetch(`${baseUrl}/api/state`);
    const storedPayload = await storedResponse.json();
    assert.deepEqual(storedPayload.state, initialState);

    const sessionResult = {
      competitors: {
        driver_1: { key: "driver_1", driverName: "Driver One", laps: 1, bestLapMs: 16500 },
      },
      passings: [{ competitorKey: "driver_1", timestamp: 17500, lapMs: 16500, validLap: true }],
      adjustments: [],
    };
    const passing = {
      timestamp: 17500,
      transponder: "1234567",
      driverId: "driver_1",
      driverName: "Driver One",
      carId: "car_1",
      carName: "Buggy",
      strength: -52.5,
      loopId: "loop_1",
      resend: false,
    };
    const passingResponse = await fetch(`${baseUrl}/api/passings`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ sessionId: "session_1", passing, sessionResult }),
    });
    assert.deepEqual(await passingResponse.json(), { ok: true });

    const hotStateResponse = await fetch(`${baseUrl}/api/state`);
    const hotState = await hotStateResponse.json();
    assert.deepEqual(hotState.state.resultsBySession.session_1, sessionResult);
    assert.deepEqual(hotState.state.events, initialState.events);

    const rowsResponse = await fetch(`${baseUrl}/api/passings?sessionId=session_1&limit=10`);
    const rowsPayload = await rowsResponse.json();
    assert.equal(rowsPayload.rows.length, 1);
    assert.equal(rowsPayload.rows[0].session_id, "session_1");
    assert.equal(rowsPayload.rows[0].timestamp_ms, 17500);
    assert.equal(rowsPayload.rows[0].transponder, "1234567");
    assert.equal(rowsPayload.rows[0].driver_id, "driver_1");
    assert.equal(rowsPayload.rows[0].car_id, "car_1");
    assert.equal(rowsPayload.rows[0].strength, -52.5);
    assert.deepEqual(JSON.parse(rowsPayload.rows[0].raw_json), passing);
  } finally {
    await stopServer(child);
    rmSync(dataDir, { recursive: true, force: true });
  }
});