# -*- coding: utf-8 -*-

from typing import Any
import argparse
import datetime
import os
import pypyodbc


def convert(tbl: str, name: str, a: Any) -> str:
    if type(a) == str:
        return f'"{a}"'
    elif type(a) == bool:
        return "T" if a else "F"
    elif a is None:
        return ""
    elif type(a) == datetime.datetime:
        if a.year == 1899 and a.month == 12 and a.day == 30:
            return a.strftime('%H:%M:%S')
        elif a.hour == 0 and a.minute == 0 and a.second == 0:
            return a.strftime('%Y-%m-%d')
        else:
            return str(a)
    else:
        return str(a)


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('-o', '--output', default='tables')
    parser.add_argument('wgdaten')
    args = parser.parse_args()

    os.makedirs(args.output, exist_ok=True)

    print(f'Opening {args.wgdaten}...', flush=True)

    pypyodbc.lowercase = False
    conn = pypyodbc.connect(f"Driver={{Microsoft Access Driver (*.mdb, *.accdb)}};Dbq={args.wgdaten};")
    cur = conn.cursor()
    print(f'Opened {args.wgdaten}!', flush=True)

    try:
        print(f'Fetching tables...', flush=True)
        tbls = cur.tables(tableType='TABLE')
        tbls = tbls.fetchall()
        print(f'Successfully fetched {len(tbls)} tables!', flush=True)

        for file, _, t_name, t_type, _ in tbls:
            print(f'Exporting {t_name}...', flush=True)

            cur.execute(f"SELECT TOP 1 * FROM {t_name};")
            desc = [(t[0], t[1]) for t in cur.description]
            cur.fetchall()
            print(desc, flush=True)

            cur.execute(f"SELECT * FROM {t_name} ORDER BY `{desc[0][0]}`;")
            cols = [t[0] for t in cur.description]

            with open(f'{args.output}/{t_name}.csv', 'wb+') as f:
                f.write((';'.join(cols) + '\n').encode('utf-8'))
                for row in cur:
                    f.write((';'.join([convert(t_name, n, a) for n, a in zip(cols, row)]) + '\n').encode('utf-8'))

            print(f'Exported {t_name} successfully!', flush=True)
    finally:
        cur.close()
        conn.close()