import { Database } from "bun:sqlite";
import type { RoundState } from "./game.ts";

const dbPath = process.env.DATABASE_PATH ?? "argumentes.sqlite";
export const db = new Database(dbPath, { create: true });

db.exec(`
  CREATE TABLE IF NOT EXISTS rounds (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    num INTEGER,
    timestamp DATETIME DEFAULT CURRENT_TIMESTAMP,
    data TEXT
  );
`);

export function saveRound(round: RoundState) {
  const insert = db.prepare("INSERT INTO rounds (num, data) VALUES ($num, $data)");
  insert.run({ $num: round.num, $data: JSON.stringify(round) });
}

export function getRounds(page: number = 1, limit: number = 10) {
  const offset = (page - 1) * limit;
  const countQuery = db.query("SELECT COUNT(*) as count FROM rounds").get() as { count: number };
  const rows = db.query("SELECT data FROM rounds ORDER BY num DESC, id DESC LIMIT $limit OFFSET $offset")
    .all({ $limit: limit, $offset: offset }) as { data: string }[];
  return {
    rounds: rows.map(r => JSON.parse(r.data) as RoundState),
    total: countQuery.count,
    page,
    limit,
    totalPages: Math.ceil(countQuery.count / limit)
  };
}

export function getAllRounds() {
  const rows = db.query("SELECT data FROM rounds ORDER BY num ASC, id ASC").all() as { data: string }[];
  return rows.map(r => JSON.parse(r.data) as RoundState);
}

export function clearAllRounds() {
  db.exec("DELETE FROM rounds;");
  db.exec("DELETE FROM sqlite_sequence WHERE name = 'rounds';");
}

// ── Questions (user-submitted via Redsys) ───────────────────────────────────

db.exec(`
  CREATE TABLE IF NOT EXISTS questions (
    id INTEGER PRIMARY KEY AUTOINCREMENT,
    text TEXT NOT NULL,
    order_id TEXT NOT NULL UNIQUE,
    status TEXT NOT NULL DEFAULT 'pending',
    created_at DATETIME DEFAULT CURRENT_TIMESTAMP
  );
`);

export function createPendingQuestion(text: string, orderId: string): number {
  const stmt = db.prepare("INSERT INTO questions (text, order_id) VALUES ($text, $orderId)");
  const result = stmt.run({ $text: text, $orderId: orderId });
  return result.lastInsertRowid as number;
}

export function markQuestionPaid(orderId: string): boolean {
  const stmt = db.prepare("UPDATE questions SET status = 'paid' WHERE order_id = $orderId AND status = 'pending'");
  const result = stmt.run({ $orderId: orderId });
  return result.changes > 0;
}

export function getNextPendingQuestion(): { id: number; text: string; order_id: string } | null {
  return db.query("SELECT id, text, order_id FROM questions WHERE status = 'paid' ORDER BY id ASC LIMIT 1")
    .get() as { id: number; text: string; order_id: string } | null;
}

export function markQuestionUsed(id: number): void {
  db.prepare("UPDATE questions SET status = 'used' WHERE id = $id").run({ $id: id });
}