#!/usr/bin/env python3

import sqlite3
import pandas as pd
import pyarrow as pa
import pyarrow.parquet as pq

def sqlite_to_parquet(sqlite_file, parquet_file):
  conn = sqlite3.connect(sqlite_file)
  cur = conn.cursor()

  cur.execute("SELECT name FROM sqlite_master WHERE type='table';")
  tables = cur.fetchall()

  df_list = []

  for table in tables:
    table_name = table[0]
    query = f'SELECT x, y, z, block_name as mat FROM "{table_name}"'
    df = pd.read_sql_query(query, conn)
    df['structure'] = table_name
    df_list.append(df)

  final_df = pd.concat(df_list, ignore_index=True)

  table = pa.Table.from_pandas(final_df)
  pq.write_table(table, parquet_file)

  conn.close()

if __name__ == '__main__':
  sqlite_to_parquet('minecraft_structures.db', 'minecraft_structures.parquet')
  print("Conversion to Parquet completed successfully.")