import logging
from io import TextIOWrapper

from utilsv2.log import logger

logger = logging.getLogger(__name__)


def read_file(fname: str) -> TextIOWrapper | OSError:
    try:
        fp = open(fname, "r", newline="\n")
        return fp
    except FileNotFoundError:
        return FileNotFoundError("Nenhum ficheiro encontrado")
    except PermissionError:
        return PermissionError("Sem permissões para abrir")


def find_events(fp: TextIOWrapper) -> list[tuple[int, int]]:
    event_indices = []

    event_start = -1
    idx = 0
    for line in fp.read().split("\n"):
        if event_start == -1:
            event_start = idx
        if is_empty(line):
            event_indices.append((event_start, idx))
            event_start = -1
        idx += 1

    logger.info("Found %d events", len(event_indices))
    return event_indices


def is_empty(_str: str) -> bool:
    return len(_str.strip(" ")) == 0


def extract_event(fp: TextIOWrapper, event_bounds: list[tuple[int, int]]):
    pass


def parse(fname: str) -> None:
    _ret = read_file(fname)
    if not isinstance(_ret, TextIOWrapper):
        logger.critical(_ret.__str__())
        raise _ret

    events = find_events(_ret)
    _ret.seek(0)
    extract_event(_ret, events)