from argparse import ArgumentParser
from contextlib import contextmanager
from inspect import isfunction, unwrap
from os import environ
from types import MethodType
from typing import Callable, List
from unittest.mock import patch

from openbb_terminal.helper_funcs import check_file_type_saved, check_positive
from openbb_terminal.rich_config import get_ordered_list_sources


def __mock_parse_known_args_and_warn(
    controller,
    parser: ArgumentParser,
    other_args: List[str],
    export_allowed: int = 0,
    raw: bool = False,
    limit: int = 0,
) -> None:
    """Add the arguments that would have normally added by :
        - openbb_terminal.parent_classes.BaseController.parse_known_args_and_warn

    Parameters
    ----------
    parser: argparse.ArgumentParser
        Parser with predefined arguments
    other_args: List[str]
        list of arguments to parse
    export_allowed: int
        Choose from 0, 1,
        2 and EXPORT_BOTH_RAW_DATA_AND_FIGURES
    raw: bool
        Add the --raw flag
    limit: int
        Add a --limit flag with this number default
    """

    _ = other_args
    parser.add_argument(
        "-h", "--help", action="store_true", help="show this help message"
    )
    if export_allowed > 0:
        choices_export = []
        help_export = "Does not export!"

        if export_allowed == 1:
            choices_export = ["csv", "json", "xlsx"]
            help_export = "Export raw data into csv, json, xlsx"
        elif export_allowed == 2:
            choices_export = ["png", "jpg", "pdf", "svg"]
            help_export = "Export figure into png, jpg, pdf, svg "
        else:
            choices_export = ["csv", "json", "xlsx", "png", "jpg", "pdf", "svg"]
            help_export = "Export raw data into csv, json, xlsx and figure into png, jpg, pdf, svg "

        parser.add_argument(
            "--export",
            default="",
            type=check_file_type_saved(choices_export),
            dest="export",
            help=help_export,
            choices=choices_export,
        )

    if raw:
        parser.add_argument(
            "--raw",
            dest="raw",
            action="store_true",
            default=False,
            help="Flag to display raw data",
        )
    if limit > 0:
        parser.add_argument(
            "-l",
            "--limit",
            dest="limit",
            default=limit,
            help="Number of entries to show in data.",
            type=check_positive,
        )
    sources = get_ordered_list_sources(f"{controller.PATH}{parser.prog}")
    # Allow to change source if there is more than one
    if len(sources) > 1:
        parser.add_argument(
            "--source",
            action="store",
            dest="source",
            choices=sources,
            default=sources[0],  # the first source from the list is the default
            help="Data source to select from",
        )


def __mock_parse_simple_args(parser: ArgumentParser, other_args: List[str]) -> None:
    """Add the arguments that would have normally added by:
        - openbb_terminal.parent_classes.BaseController.parse_simple_args

    Parameters
    ----------
    parser: argparse.ArgumentParser
        Parser with predefined arguments
    other_args: List[str]
        List of arguments to parse
    """
    parser.add_argument(
        "-h", "--help", action="store_true", help="show this help message"
    )
    _ = other_args


def __get_command_func(controller, command: str):
    """Get the function with the name `f"call_{command}"` from controller object.

    Parameters
    ----------
    controller: BaseController
        Instance of the Terminal Controller.
    command: str
        A name from controller.CHOICES_COMMANDS

    Returns
    -------
    Callable: Command function.
    """

    if command not in controller.CHOICES_COMMANDS:
        raise AttributeError(
            f"The following command is not inside `CHOICES_COMMANDS` : '{command}'"
        )

    command = f"call_{command}"
    command_func = getattr(controller, command)
    command_func = unwrap(func=command_func)

    if isfunction(command_func):
        command_func = MethodType(command_func, controller)

    return command_func


def contains_functions_to_patch(command_func: Callable) -> bool:
    """Check if a `command_func` actually contains the functions we want to mock, i.e.:
        - parse_simple_args
        - parse_known_args_and_warn

    Parameters
    ----------
    command_func: Callable
        Function to check.

    Returns
    -------
    bool: Whether or not `command_func` contains the mocked functions.
    """

    co_names = command_func.__code__.co_names

    if "parse_simple_args" in co_names:
        in_command = True
    elif "parse_known_args_and_warn" in co_names:
        in_command = True
    else:
        in_command = False

    return in_command


@contextmanager
def __patch_controller_functions(controller):
    """Patch the following function from a BaseController instance:
        - parse_simple_args
        - parse_known_args_and_warn

    These functions take an 'argparse.ArgumentParser' object as parameter.
    We want to intercept this 'argparse.ArgumentParser' object.

    Parameters
    ----------
    controller: BaseController
        BaseController object that needs to be patched.

    Returns
    -------
    List[Callable]: List of mocked functions.
    """

    bound_mock_parse_known_args_and_warn = MethodType(
        __mock_parse_known_args_and_warn,
        controller,
    )

    rich = patch(
        target="openbb_terminal.rich_config.ConsoleAndPanel.print",
        return_value=None,
    )

    patcher_list = [
        patch.object(
            target=controller,
            attribute="parse_simple_args",
            side_effect=__mock_parse_simple_args,
            return_value=None,
        ),
        patch.object(
            target=controller,
            attribute="parse_known_args_and_warn",
            side_effect=bound_mock_parse_known_args_and_warn,
            return_value=None,
        ),
    ]

    if str(environ.get("DEBUG_MODE", "false")).lower() != "true":
        rich.start()
    patched_function_list = []
    for patcher in patcher_list:
        patched_function_list.append(patcher.start())

    yield patched_function_list

    if str(environ.get("DEBUG_MODE", "false")).lower() != "true":
        rich.stop()
    for patcher in patcher_list:
        patcher.stop()


def _get_argument_parser(
    controller,
    command: str,
) -> ArgumentParser:
    """Intercept the ArgumentParser instance from the command function.

    A command function being a function starting with `call_`, like:
        - call_help
        - call_overview
        - call_load

    Parameters
    ----------
    controller: BaseController
        Instance of the Terminal Controller.
    command: str
        A name from `controller.CHOICES_COMMANDS`.

    Returns
    -------
    ArgumentParser: ArgumentParser instance from the command function.
    """

    command_func: Callable = __get_command_func(controller=controller, command=command)

    if not contains_functions_to_patch(command_func=command_func):
        raise AssertionError(
            f"One of these functions should be inside `call_{command}`:\n"
            " - parse_simple_args\n"
            " - parse_known_args_and_warn\n"
        )

    with __patch_controller_functions(controller=controller) as patched_function_list:
        command_func([])

        call_count = 0
        for patched_function in patched_function_list:
            call_count += patched_function.call_count
            if patched_function.call_count == 1:
                args = patched_function.call_args.args
                argument_parser = args[0]

        if call_count != 1:
            raise AssertionError(
                f"One of these functions should be called once inside `call_{command}`:\n"
                " - parse_simple_args\n"
                " - parse_known_args_and_warn\n"
            )

    return argument_parser


def _build_command_choice_map(argument_parser: ArgumentParser) -> dict:
    choice_map: dict = {}
    for action in argument_parser._actions:  # pylint: disable=protected-access
        if len(action.option_strings) == 1:
            long_name = action.option_strings[0]
            short_name = ""
        elif len(action.option_strings) == 2:
            short_name = action.option_strings[0]
            long_name = action.option_strings[1]
        else:
            raise AttributeError(f"Invalid argument_parser: {argument_parser}")

        if hasattr(action, "choices") and action.choices:
            choice_map[long_name] = {str(c): {} for c in action.choices}
        else:
            choice_map[long_name] = {}

        if short_name and long_name:
            choice_map[short_name] = long_name

    return choice_map


def build_controller_choice_map(controller) -> dict:
    command_list = controller.CHOICES_COMMANDS
    controller_choice_map: dict = {c: {} for c in controller.controller_choices}
    controller_choice_map["support"] = controller.SUPPORT_CHOICES
    controller_choice_map["about"] = controller.ABOUT_CHOICES

    for command in command_list:
        try:
            argument_parser = _get_argument_parser(
                controller=controller,
                command=command,
            )
            controller_choice_map[command] = _build_command_choice_map(
                argument_parser=argument_parser
            )
        except Exception as exception:
            if str(environ.get("DEBUG_MODE", "false")).lower() == "true":
                raise Exception(
                    f"On command : `{command}`.\n{str(exception)}"
                ) from exception

    return controller_choice_map
