7export const LOG_MAX = 200;

9let entries = [];
10let nextId = 1;
11const listeners = new Set();
12const changed = () => {
13  for (const l of listeners) l();
14};
15
16export const jevLog = {
17  subscribe(l) {
18    listeners.add(l);
19    return () => listeners.delete(l);
20  },
21  get: () => entries,
22  // A new line at the top: { status: 'asking' | 'answered' | 'fallback' | 'picked' | 'error', text, song?, ms? }.
23  // Returns its id, to update it when its answer lands.
24  add(entry, now = Date.now()) {
25    const id = nextId++;
26    entries = [{ ...entry, id, at: now }, ...entries].slice(0, LOG_MAX);
27    changed();
28    return id;
29  },
30  // Fills in a line in place: it keeps its place in the log.
31  update(id, fields) {
32    if (!entries.some((e) => e.id === id)) return;
33    entries = entries.map((e) => (e.id === id ? { ...e, ...fields } : e));
34    changed();
35  },
36  clear() {
37    entries = [];
38    changed();
39  },
40};