# mautrix-twitter - A Matrix-Twitter DM puppeting bridge
# Copyright (C) 2020 Tulir Asokan
#
# 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/>.
from mauigpapi.state import AndroidState
from mauigpapi.http import AndroidAPI
from mauigpapi.errors import (IGLoginTwoFactorRequiredError, IGLoginBadPasswordError,
                              IGLoginInvalidUserError, IGLoginError)

from mautrix.bridge.commands import HelpSection, command_handler
from .typehint import CommandEvent

SECTION_AUTH = HelpSection("Authentication", 10, "")


@command_handler(needs_auth=False, management_only=True, help_section=SECTION_AUTH,
                 help_text="Log in to Instagram", help_args="<_username_> <_password_>")
async def login(evt: CommandEvent) -> None:
    if await evt.sender.is_logged_in():
        await evt.reply("You're already logged in")
        return
    elif len(evt.args) < 2:
        await evt.reply("**Usage:** `$cmdprefix+sp login <username> <password>`")
        return
    username = evt.args[0]
    password = " ".join(evt.args[1:])
    state = AndroidState()
    state.device.generate(username)
    api = AndroidAPI(state)
    await api.simulate_pre_login_flow()
    try:
        resp = await api.login(username, password)
    except IGLoginTwoFactorRequiredError as e:
        tfa_info = e.body.two_factor_info
        msg = "Username and password accepted, but you have two-factor authentication enabled.\n"
        if tfa_info.sms_two_factor_on:
            if tfa_info.totp_two_factor_on:
                msg += (f"Send the code from your authenticator app "
                        f"or one sent to {tfa_info.obfuscated_phone_number} here.")
            else:
                msg += f"Send the code sent to {tfa_info.obfuscated_phone_number} here."
        elif tfa_info.totp_two_factor_on:
            msg += "Send the code from your authenticator app here."
        else:
            msg += ("Unfortunately, none of your two-factor authentication methods are currently "
                    "supported by the bridge.")
            return
        evt.sender.command_status = {
            "action": "Login",
            "room_id": evt.room_id,
            "next": enter_login_2fa,

            "username": tfa_info.username,
            "2fa_identifier": tfa_info.two_factor_identifier,
            "state": state,
            "api": api,
        }
    except IGLoginInvalidUserError:
        await evt.reply("Invalid username")
    except IGLoginBadPasswordError:
        await evt.reply("Incorrect password")
    else:
        evt.sender.state = state
        user = resp.logged_in_user
        await evt.reply(f"Successfully logged in as {user.full_name} ([@{user.username}]"
                        f"(https://instagram.com/{user.username}), user ID: {user.pk})")
        await evt.sender.try_connect()


async def enter_login_2fa(evt: CommandEvent) -> None:
    api: AndroidAPI = evt.sender.command_status["api"]
    state: AndroidState = evt.sender.command_status["state"]
    identifier = evt.sender.command_status["2fa_identifier"]
    username = evt.sender.command_status["username"]
    evt.sender.command_status = None
    try:
        user = await api.two_factor_login(username, code="".join(evt.args), identifier=identifier)
    except IGLoginError as e:
        await evt.reply(f"Failed to log in: {e.body.message}")
    except Exception as e:
        await evt.reply(f"Failed to log in: {e}")
        evt.log.exception("Failed to log in")
    else:
        evt.sender.state = state
        await evt.reply(f"Successfully logged in as {user.full_name} ([@{user.username}]"
                        f"(https://instagram.com/{user.username}), user ID: {user.pk})")
        await evt.sender.try_connect()


@command_handler(needs_auth=True, help_section=SECTION_AUTH, help_text="Disconnect the bridge from"
                                                                       "your Instagram account")
async def logout(evt: CommandEvent) -> None:
    await evt.sender.logout()
    await evt.reply("Successfully logged out")