import { runTest } from './runner.js';
import { parseResults } from './parser.js';
import { updateJobStatus, updateJobMetrics } from './db.js';

// SSE subscribers: jobId -> Set of send functions
const subscribers = new Map();

// Job queue
const queue = [];
let running = false;

export function subscribe(jobId, sendFn) {
  if (!subscribers.has(jobId)) subscribers.set(jobId, new Set());
  subscribers.get(jobId).add(sendFn);
  return () => {
    const set = subscribers.get(jobId);
    if (set) {
      set.delete(sendFn);
      if (set.size === 0) subscribers.delete(jobId);
    }
  };
}

function emit(jobId, event, data) {
  const set = subscribers.get(jobId);
  if (!set) return;
  const payload = `event: ${event}\ndata: ${JSON.stringify(data)}\n\n`;
  for (const send of set) {
    try { send(payload); } catch {}
  }
}

export function enqueue(job) {
  queue.push(job);
  emit(job.id, 'status', { message: 'Queued, waiting for runner...', phase: 'queued' });
  processQueue();
}

async function processQueue() {
  if (running || queue.length === 0) return;
  running = true;
  const job = queue.shift();

  try {
    updateJobStatus(job.id, 'running');
    emit(job.id, 'status', { message: 'Test starting...', phase: 'running' });

    const outputFolder = await runTest(job, (line) => {
      emit(job.id, 'log', { line });
    });

    emit(job.id, 'status', { message: 'Parsing results...', phase: 'parsing' });
    updateJobStatus(job.id, 'running', { report_folder: outputFolder });

    let metrics = {};
    try {
      metrics = await parseResults(outputFolder, job.url);
      updateJobMetrics(job.id, metrics);
    } catch (err) {
      emit(job.id, 'log', { line: `[parser warning] ${err.message}` });
    }

    updateJobStatus(job.id, 'done', { report_folder: outputFolder });
    emit(job.id, 'status', { message: 'Done!', phase: 'done' });
    emit(job.id, 'done', { jobId: job.id });
  } catch (err) {
    updateJobStatus(job.id, 'error', { error_msg: err.message });
    emit(job.id, 'error', { message: err.message });
  } finally {
    running = false;
    // Small delay then process next
    setTimeout(processQueue, 500);
  }
}

export function getQueueLength() {
  return queue.length;
}

export function isRunning() {
  return running;
}