import { readFileSync, writeFileSync, existsSync } from 'fs';
import { randomUUID } from 'crypto';

const STORE_PATH = './market-calls.json';

// MarketCallStore — persists quarterly market thesis entries to market-calls.json.
//
// A market call captures:
//   - A written thesis (the reasoning behind the call)
//   - Tickers to watch
//   - A snapshot of each ticker's price + signal at the time of the call
//   - Performance tracking (current vs snapshot price) computed on read
//
// Format:
// {
//   "calls": [
//     {
//       "id": "uuid",
//       "title": "Q3 2025 — Rate pivot & tech rotation",
//       "quarter": "Q3 2025",
//       "date": "2025-07-01",
//       "thesis": "The Fed is expected to begin cutting...",
//       "tickers": ["AAPL", "MSFT", "TLT"],
//       "snapshot": {
//         "AAPL": { "price": 195.00, "signal": "✅ Strong Buy", "verdict": "BUY (High Conviction)" }
//       },
//       "createdAt": "2025-07-01T14:22:00.000Z"
//     }
//   ]
// }

export class MarketCallStore {
  _load() {
    if (!existsSync(STORE_PATH)) return { calls: [] };
    try {
      return JSON.parse(readFileSync(STORE_PATH, 'utf8'));
    } catch {
      return { calls: [] };
    }
  }

  _save(data) {
    writeFileSync(STORE_PATH, JSON.stringify(data, null, 2), 'utf8');
  }

  list() {
    return this._load().calls.sort((a, b) => new Date(b.createdAt) - new Date(a.createdAt));
  }

  get(id) {
    return this._load().calls.find((c) => c.id === id) ?? null;
  }

  // Create a new call. snapshot is an object keyed by ticker with { price, signal, verdict }.
  create({ title, quarter, date, thesis, tickers, snapshot }) {
    const data = this._load();
    const call = {
      id: randomUUID(),
      title,
      quarter,
      date: date ?? new Date().toISOString().slice(0, 10),
      thesis,
      tickers,
      snapshot: snapshot ?? {},
      createdAt: new Date().toISOString(),
    };
    data.calls.push(call);
    this._save(data);
    return call;
  }

  delete(id) {
    const data = this._load();
    const before = data.calls.length;
    data.calls = data.calls.filter((c) => c.id !== id);
    if (data.calls.length === before) return false;
    this._save(data);
    return true;
  }
}