import Database from "better-sqlite3";
import path from "node:path";

type Row = Record<string, unknown>;

let _db: Database.Database | null = null;

function dbPath(): string {
  const raw = process.env.ALPACLAUDIA_DB || "../data/alpaclaudia.db";
  return path.isAbsolute(raw) ? raw : path.resolve(process.cwd(), raw);
}

function getDb(): Database.Database | null {
  if (_db) return _db;
  try {
    _db = new Database(dbPath(), { readonly: true, fileMustExist: true });
    return _db;
  } catch {
    return null;
  }
}

export function recentTicks(limit = 300): Row[] {
  const db = getDb();
  if (!db) return [];
  return db
    .prepare(`SELECT id, ts, equity, cash, buying_power, mode FROM ticks ORDER BY id DESC LIMIT ?`)
    .all(limit) as Row[];
}

export function recentIntents(limit = 200): Row[] {
  const db = getDb();
  if (!db) return [];
  return db
    .prepare(
      `SELECT id, ts, strategy, symbol, side, qty, order_type, limit_price,
              trail_percent, details_json, submitted, alpaca_order_id, status
         FROM order_intents ORDER BY id DESC LIMIT ?`
    )
    .all(limit) as Row[];
}

export function intentsSince(iso: string): Row[] {
  const db = getDb();
  if (!db) return [];
  return db
    .prepare(
      `SELECT id, ts, strategy, symbol, side, qty, order_type, limit_price,
              trail_percent, details_json, submitted, alpaca_order_id, status
         FROM order_intents WHERE ts >= ? ORDER BY id DESC`
    )
    .all(iso) as Row[];
}

export function recentEvents(limit = 100): Row[] {
  const db = getDb();
  if (!db) return [];
  return db
    .prepare(`SELECT id, ts, kind, payload_json FROM events ORDER BY id DESC LIMIT ?`)
    .all(limit) as Row[];
}

export function dbStatus(): { ok: boolean; path: string; error?: string } {
  const p = dbPath();
  try {
    const db = getDb();
    if (!db) return { ok: false, path: p, error: "could not open db" };
    return { ok: true, path: p };
  } catch (e: unknown) {
    return { ok: false, path: p, error: e instanceof Error ? e.message : String(e) };
  }
}