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

from openbb_terminal.core.session.current_system import get_current_system
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

    return bool(
        "parse_simple_args" in co_names or "parse_known_args_and_warn" in co_names
    )


@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 not get_current_system().DEBUG_MODE:
        rich.start()
    patched_function_list = []
    for patcher in patcher_list:
        patched_function_list.append(patcher.start())

    yield patched_function_list

    if not get_current_system().DEBUG_MODE:
        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 action.help == SUPPRESS:
            continue
        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
    controller_choice_map["hold"] = controller.HELP_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 get_current_system().DEBUG_MODE:
                raise Exception(
                    f"On command : `{command}`.\n{str(exception)}"
                ) from exception

    return controller_choice_map