part of 'firo_cache.dart';

class FCResult {
  final bool success;
  final Object? error;

  FCResult({required this.success, this.error});
}

// ===========================================================================
// ================== write to spark used tags cache =========================

/// update the sqlite cache
/// Expected json format:
/// returns true if successful, otherwise some exception
FCResult _updateSparkUsedTagsWith(
  Database db,
  List<List<dynamic>> tags,
) {
  // hash the tags here since this function is called in a background isolate
  final hashedTags = LibSpark.hashTags(
    base64Tags: tags.map((e) => e[0] as String).toSet(),
  ).toList();

  if (hashedTags.isEmpty) {
    // nothing to add, return early
    return FCResult(success: true);
  }

  db.execute("BEGIN;");
  try {
    for (int i = 0; i < hashedTags.length; i++) {
      db.execute(
        """
          INSERT OR IGNORE INTO SparkUsedCoinTags (tag, txid)
          VALUES (?, ?);
        """,
        [hashedTags[i], (tags[i][1] as String).toHexReversedFromBase64],
      );
    }

    db.execute("COMMIT;");

    return FCResult(success: true);
  } catch (e) {
    db.execute("ROLLBACK;");
    return FCResult(success: false, error: e);
  }
}

// ===========================================================================
// ================== write to spark anon set cache ==========================

/// update the sqlite cache
///
/// returns true if successful, otherwise false
FCResult _updateSparkAnonSetCoinsWith(
  Database db,
  final List<RawSparkCoin> coinsRaw,
  SparkAnonymitySetMeta meta,
) {
  if (coinsRaw.isEmpty) {
    // no coins to actually insert
    return FCResult(success: true);
  }

  final checkResult = db.select(
    """
      SELECT *
      FROM SparkSet
      WHERE blockHash = ? AND setHash = ? AND groupId = ?;
    """,
    [
      meta.blockHash,
      meta.setHash,
      meta.coinGroupId,
    ],
  );

  if (checkResult.isNotEmpty) {
    // already up to date
    return FCResult(success: true);
  }

  final coins = coinsRaw.reversed;

  db.execute("BEGIN;");
  try {
    db.execute(
      """
        INSERT INTO SparkSet (blockHash, setHash, groupId, size)
        VALUES (?, ?, ?, ?);
      """,
      [meta.blockHash, meta.setHash, meta.coinGroupId, meta.size],
    );
    final setId = db.lastInsertRowId;

    for (final coin in coins) {
      db.execute(
        """
            INSERT INTO SparkCoin (serialized, txHash, context, groupId)
            VALUES (?, ?, ?, ?);
          """,
        [coin.serialized, coin.txHash, coin.context, coin.groupId],
      );
      final coinId = db.lastInsertRowId;

      // finally add the row id to the newly added set
      db.execute(
        """
          INSERT INTO SparkSetCoins (setId, coinId)
          VALUES (?, ?);
        """,
        [setId, coinId],
      );
    }

    db.execute("COMMIT;");

    return FCResult(success: true);
  } catch (e) {
    db.execute("ROLLBACK;");
    return FCResult(success: false, error: e);
  }
}