# This is for helpers that do NOT import any OpenBB Modules
import importlib
import logging
import os
import sys
from typing import Any, Callable, List, Literal, Optional

from dotenv import load_dotenv
from rich.console import Console

from openbb_terminal.core.config.paths import (
    PACKAGE_ENV_FILE,
    REPOSITORY_ENV_FILE,
    USER_ENV_FILE,
)

console = Console()

menus = Literal["", "featflags", "settings"]


def handle_error(name: str, default: Any, menu: menus = ""):
    """Handles the error by returning the default value and printing an
    informative error message.

    Parameters
    ----------
    name: str
        The name of the environment variable
    default: Any
        The value to return if the converter fails
    menu: menus
        If provided, will tell the user where to fix the setting

    Returns
    ----------
    Any
        The default value

    """
    base = f"[red]Invalid variable provided for variable '{name}'."
    if menu:
        base += f" Please change the setting in the `{menu}` menu."
    base += "[/red]\n"
    console.print(base)
    return default


def load_env_vars(
    name: str, converter: Callable, default: Any, menu: menus = ""
) -> Any:
    """Loads an environment variable and attempts to convert it to the correct data type.
    Will return the provided default if it fails

    Parameters
    ----------
    name: str
        The name of the environment variable
    converter: Callable
        The function to convert the env variable to the desired format
    default: Any
        The value to return if the converter fails
    menu: menus
        If provided, will tell the user where to fix the setting

    Returns
    ----------
    Any
        The value or the default
    """
    raw_var = os.getenv(name, str(default))
    try:
        return converter(raw_var)
    except ValueError:
        return handle_error(name, default, menu)
    except AttributeError:
        return handle_error(name, default, menu)
    except TypeError:
        return handle_error(name, default, menu)


def strtobool(val):
    """Convert a string representation of truth to true (1) or false (0).

    True values are 'y', 'yes', 't', 'true', 'on', and '1'; false values
    are 'n', 'no', 'f', 'false', 'off', and '0'.  Raises ValueError if
    'val' is anything else.
    """
    val = str(val).lower()
    if val in ("y", "yes", "t", "true", "on", "1"):
        output = True
    elif val in ("n", "no", "f", "false", "off", "0"):
        output = False
    else:
        raise ValueError(f"invalid truth value {val}")

    return output


def load_dotenv_and_reload_configs():
    """Loads the dotenv files in the following order:
    1. Repository .env file
    2. Package .env file
    3. User .env file

    This allows the user to override the package settings with their own
    settings, and the package to override the repository settings.

    openbb_terminal modules are reloaded to refresh config files with new env,
    otherwise they will use cache with old variables.
    """
    load_dotenv(REPOSITORY_ENV_FILE, override=True)
    load_dotenv(PACKAGE_ENV_FILE, override=True)
    load_dotenv(USER_ENV_FILE, override=True)

    reload_openbb_config_modules()


def reload_openbb_config_modules():
    """Reloads openbb config modules"""

    reload_modules(
        to_reload=[
            "openbb_terminal.config_plot",
            "openbb_terminal.config_terminal",
            "openbb_terminal.feature_flags",
            "openbb_terminal.core.config",
        ]
    )


def reload_modules(to_reload: List[str]):
    """Reloads modules"""
    modules = sys.modules.copy()
    for module in modules:
        if module in to_reload:
            importlib.reload(sys.modules[module])


def remove_log_handlers():
    """Remove the log handlers - needs to be done before reloading modules."""
    for handler in logging.root.handlers[:]:
        logging.root.removeHandler(handler)


def clear_openbb_env_vars(exceptions: Optional[List[str]] = None):
    """Clear openbb environment variables."""
    for v in os.environ:
        if v.startswith("OPENBB"):
            if not exceptions:
                os.environ.pop(v)
            elif v not in exceptions:
                os.environ.pop(v)