from __future__ import annotations
from pathlib import Path
from typing import Union, List, Optional

from ..logger import logger


class GenericText:
    def __init__(self, content: Optional[Union[List[str], Path, str]] = None):
        #  TODO: what if paths are not absolute? Have a root available?
        if isinstance(content, list):
            self._content: Optional[List[str]] = content
            self._path = None
            self._initialized = True
        elif isinstance(content, Path) or isinstance(content, str):
            self._content = None
            self._path = Path(content)
            self._initialized = True
        else:
            self._content = None
            self._path = None
            self._initialized = False

    @property
    def text(self) -> List[str]:
        if self._initialized:
            if self._content is None:
                if self._path is None:
                    raise NotImplementedError  # Programming error
                try:
                    with open(self._path, 'r') as file:
                        self._content = file.readlines()
                except FileNotFoundError:
                    raise NotImplementedError
                except:
                    raise NotImplementedError
            return self._content
        else:
            return []

    @text.setter
    def text(self, content: Union[List[str], Path, None]) -> None:
        if isinstance(content, List):
            self._content = content
            self._path = None
            self._initialized = True
        elif isinstance(content, Path):
            self._content = None
            self._path = content
            self._initialized = True
        else:
            self._content = None
            self._path = None
            self._initialized = False

    @property
    def path(self) -> Optional[Path]:
        return self._path

    @property
    def pathname(self) -> Optional[str]:
        return str(self._path) if self._path else None

    def format(self, **kwargs) -> str:
        lines = []
        for line in self.text:
            try:
                line = '% ' + line.rstrip().format(**kwargs).ljust(77) + '%'
                if len(line) > 80:
                    logger.warning(
                        'Line too long')  # TODO
                lines.append(line)
            except ValueError:
                raise NotImplementedError
        return '\n'.join(lines)

    def has_value(self) -> bool:
        return self._initialized

    @property
    def real_text(self) -> Optional[List[str]]:
        if self.has_value():
            return self._content
        else:
            return None

    def __add__(self, other: Union[None, GenericText, List[str]]) -> GenericText:
        if not self.has_value():
            return other
        if isinstance(other, GenericText):
            if not other.has_value():
                return self
            return GenericText(self.text + other.text)
        else:
            return GenericText(self.text + other)

    def __iadd__(self, other: Union[None, GenericText, List[str]]) -> GenericText:
        if not self.has_value():
            if isinstance(other, GenericText):
                self.text = other.text
            else:
                self.text = other
        elif isinstance(other, GenericText):
            if other.has_value():
                self.text += other.text
        else:
            self.text += other
        return self

    def __radd__(self, other):
        if other is None:
            return self
        return other + self