#!/bin/env python3
# -*- coding: utf-8 -*-

from typing import Iterator, Dict, Any, Tuple
import re
import datetime

RE_INT = re.compile(r'-?[0-9]+')
RE_FLOAT = re.compile(r'-?[0-9]+\.[0-9]+')


def cast_value(value: str) -> Any:
    if value == '':
        return None
    elif value[0] == '"' and value[-1] == '"':
        return value[1:-1]
    elif value == 'T':
        return True
    elif value == 'F':
        return False
    elif RE_INT.fullmatch(value):
        return int(value)
    elif RE_FLOAT.fullmatch(value):
        return float(value)
    elif len(value) == 10 and value[4] == '-' and value[7] == '-':
        return datetime.datetime.strptime(value, '%Y-%m-%d').date()
    elif len(value) == 8 and value[2] == ':' and value[5] == ':':
        return datetime.time.fromisoformat(value)
    else:
        raise RuntimeError(f'unable to infer type of value "{value}"')


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


def parse_line(line_str: str) -> Iterator[str]:
    w = None
    s = False
    for ch in line_str:
        if w is None:
            if ch == ';':
                yield ''
                continue
            elif ch in (' ', '\t'):
                continue
            w = ch
            s = ch == '"'
            continue
        elif not s and ch in (';', '\n'):
            yield w.strip()
            w = None
            continue
        elif s and ch == '"':
            s = False
        w += ch
    if w is not None:
        yield w.strip()


def parse(filename: str) -> Iterator[Tuple]:
    with open(filename, 'r', encoding='utf-8') as f:
        lines = f.__iter__()
        yield tuple([part.strip() for part in next(lines).split(';')])
        for line in lines:
            yield tuple([cast_value(part) for part in parse_line(line)])


def parse_dict(filename: str) -> Iterator[Dict[str, Any]]:
    rows = parse(filename)
    header = next(rows)
    for row in rows:
        yield {header[i]: part for i, part in enumerate(row)}


def format_row(*values) -> str:
    return ';'.join([convert_value(v) for v in values]) + '\n'