# piker: trading gear for hackers
# Copyright (C) 2018-present  Tyler Goodlet (in stewardship of piker0)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.

"""
Broker configuration mgmt.
"""
import platform
import sys
import os
from os.path import dirname
import shutil
from typing import Optional

from bidict import bidict
import toml

from .log import get_logger

log = get_logger('broker-config')


# taken from ``click`` since apparently they have some
# super weirdness with sigint and sudo..no clue
def get_app_dir(app_name, roaming=True, force_posix=False):
    r"""Returns the config folder for the application.  The default behavior
    is to return whatever is most appropriate for the operating system.

    To give you an idea, for an app called ``"Foo Bar"``, something like
    the following folders could be returned:

    Mac OS X:
      ``~/Library/Application Support/Foo Bar``
    Mac OS X (POSIX):
      ``~/.foo-bar``
    Unix:
      ``~/.config/foo-bar``
    Unix (POSIX):
      ``~/.foo-bar``
    Win XP (roaming):
      ``C:\Documents and Settings\<user>\Local Settings\Application Data\Foo Bar``
    Win XP (not roaming):
      ``C:\Documents and Settings\<user>\Application Data\Foo Bar``
    Win 7 (roaming):
      ``C:\Users\<user>\AppData\Roaming\Foo Bar``
    Win 7 (not roaming):
      ``C:\Users\<user>\AppData\Local\Foo Bar``

    .. versionadded:: 2.0

    :param app_name: the application name.  This should be properly capitalized
                     and can contain whitespace.
    :param roaming: controls if the folder should be roaming or not on Windows.
                    Has no affect otherwise.
    :param force_posix: if this is set to `True` then on any POSIX system the
                        folder will be stored in the home folder with a leading
                        dot instead of the XDG config home or darwin's
                        application support folder.
    """

    def _posixify(name):
        return "-".join(name.split()).lower()

    # if WIN:
    if platform.system() == 'Windows':
        key = "APPDATA" if roaming else "LOCALAPPDATA"
        folder = os.environ.get(key)
        if folder is None:
            folder = os.path.expanduser("~")
        return os.path.join(folder, app_name)
    if force_posix:
        return os.path.join(os.path.expanduser("~/.{}".format(_posixify(app_name))))
    if sys.platform == "darwin":
        return os.path.join(
            os.path.expanduser("~/Library/Application Support"), app_name
        )
    return os.path.join(
        os.environ.get("XDG_CONFIG_HOME", os.path.expanduser("~/.config")),
        _posixify(app_name),
    )


_config_dir = _click_config_dir = get_app_dir('piker')
_parent_user = os.environ.get('SUDO_USER')

if _parent_user:
    non_root_user_dir = os.path.expanduser(
        f'~{_parent_user}'
    )
    root = 'root'
    _config_dir = (
        non_root_user_dir +
        _click_config_dir[
            _click_config_dir.rfind(root) + len(root):
        ]
    )

_file_name = 'brokers.toml'
_watchlists_data_path = os.path.join(_config_dir, 'watchlists.json')
_context_defaults = dict(
    default_map={
        # Questrade specific quote poll rates
        'monitor': {
            'rate': 3,
        },
        'optschain': {
            'rate': 1,
        },
    }
)


def _override_config_dir(
    path: str
) -> None:
    global _config_dir
    _config_dir = path


def get_broker_conf_path():
    """Return the default config path normally under
    ``~/.config/piker`` on linux.

    Contains files such as:
    - brokers.toml
    - watchlists.toml
    - signals.toml
    - strats.toml

    """
    return os.path.join(_config_dir, _file_name)


def repodir():
    """Return the abspath to the repo directory.
    """
    dirpath = os.path.abspath(
        # we're 3 levels down in **this** module file
        dirname(dirname(os.path.realpath(__file__)))
    )
    return dirpath


def load(
    path: str = None
) -> (dict, str):
    """Load broker config.
    """
    path = path or get_broker_conf_path()
    if not os.path.isfile(path):
        shutil.copyfile(
            os.path.join(repodir(), 'config', 'brokers.toml'),
            path,
        )

    config = toml.load(path)
    log.debug(f"Read config file {path}")
    return config, path


def write(
    config: dict,  # toml config as dict
    path: str = None,
) -> None:
    """Write broker config to disk.

    Create a ``brokers.ini`` file if one does not exist.
    """
    path = path or get_broker_conf_path()
    dirname = os.path.dirname(path)
    if not os.path.isdir(dirname):
        log.debug(f"Creating config dir {_config_dir}")
        os.makedirs(dirname)

    if not config:
        raise ValueError(
            "Watch out you're trying to write a blank config!")

    log.debug(f"Writing config file {path}")
    with open(path, 'w') as cf:
        return toml.dump(config, cf)


def load_accounts(

    providers: Optional[list[str]] = None

) -> bidict[str, Optional[str]]:

    conf, path = load()
    accounts = bidict()
    for provider_name, section in conf.items():
        accounts_section = section.get('accounts')
        if (
            providers is None or
            providers and provider_name in providers
        ):
            if accounts_section is None:
                log.warning(f'No accounts named for {provider_name}?')
                continue
            else:
                for label, value in accounts_section.items():
                    accounts[
                        f'{provider_name}.{label}'
                    ] = value

    # our default paper engine entry
    accounts['paper'] = None
    return accounts