#    Friendly Telegram (telegram userbot)
#    Copyright (C) 2018-2021 The Authors

#    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/>.

import ast
import inspect
import locale
import os
import string
import sys
import time

from dialog import Dialog, ExecutableNotFound

from . import utils, main


def _safe_input(*args, **kwargs):
    """Try to invoke input(*), print an error message if an EOFError or OSError occurs)"""
    try:
        return input(*args, **kwargs)
    except (EOFError, OSError):
        raise    
    except KeyboardInterrupt:
        print()
        return None


class TDialog:
    """Reimplementation of dialog.Dialog without external dependencies"""

    OK = True
    NOT_OK = False

    def __init__(self):
        self._title = ""

    # Similar interface to pythondialog
    def menu(self, title, choices):
        """Print a menu and get a choice"""

        print(self._title)
        print()
        print()
        print(title)
        print()
        biggest = max(len(k) for k, d in choices)

        for i, (k, v) in enumerate(choices, 1):
            print(
                f" {str(i)}. {k}"
                + " " * (biggest + 2 - len(k))
                + (v.replace("\n", "...\n      "))
            )

        while True:
            inp = _safe_input(
                "Please enter your selection as a number, or 0 to cancel: "
            )
            if inp is None:
                inp = 0
            try:
                inp = int(inp)
                if inp == 0:
                    return self.NOT_OK, "Cancelled"
                return self.OK, choices[inp - 1][0]
            except (ValueError, IndexError):
                pass

    def inputbox(self, query):
        """Get a text input of the query"""

        print(self._title)
        print()
        print()
        print(query)
        print()
        inp = _safe_input("Please enter your response, or type nothing to cancel: ")
        if inp == "" or inp is None:
            return self.NOT_OK, "Cancelled"
        return self.OK, inp

    def msgbox(self, msg):
        """Print some info"""

        print(self._title)
        print()
        print()
        print(msg)
        return self.OK

    def set_background_title(self, title):
        """Set the internal variable"""
        self._title = title

    def yesno(self, question):
        """Ask yes or no, default to no"""
        print(self._title)
        print()
        return (
            self.OK
            if (_safe_input(f"{question} (y/N): ") or "").lower() == "y"
            else self.NOT_OK
        )


TITLE = ""

if sys.stdout.isatty():
    try:
        DIALOG = Dialog(dialog="dialog", autowidgetsize=True)
        locale.setlocale(locale.LC_ALL, "")
    except (ExecutableNotFound, locale.Error):
        # Fall back to a terminal based configurator.
        DIALOG = TDialog()
else:
    DIALOG = TDialog()

MODULES = None
DB = None  # eww... meh.


# pylint: disable=W0603


def validate_value(value):
    """Convert string to literal or return string"""
    try:
        return ast.literal_eval(value)
    except (ValueError, SyntaxError):
        return value


def modules_config():
    """Show menu of all modules and allow user to enter one"""
    code, tag = DIALOG.menu(
        "Modules",
        choices=[
            (module.name, inspect.cleandoc(getattr(module, "__doc__", None) or ""))
            for module in MODULES.modules
            if getattr(module, "config", {})
        ],
    )
    if code == DIALOG.OK:
        for mod in MODULES.modules:
            if mod.name == tag:
                # Match
                while not module_config(mod):
                    time.sleep(.05)
        return modules_config()
    return None


def module_config(mod):
    """Show menu for specific module and allow user to set config items"""
    choices = [
        (key, getattr(mod.config, "getdoc", lambda k: "Undocumented key")(key))
        for key in getattr(mod, "config", {}).keys()
    ]
    code, tag = DIALOG.menu(
        "Module configuration for {}".format(mod.name), choices=choices
    )
    if code == DIALOG.OK:
        code, value = DIALOG.inputbox(tag)
        if code == DIALOG.OK:
            DB.setdefault(mod.__module__, {}).setdefault("__config__", {})[
                tag
            ] = validate_value(value)
            DIALOG.msgbox("Config value set successfully")
        return False
    return True


def run(database, data_root, phone, init, mods):
    """Launch configurator"""
    global DB, MODULES, TITLE
    DB = database
    MODULES = mods
    TITLE = "Userbot Configuration for {}"
    TITLE = TITLE.format(phone)
    DIALOG.set_background_title(TITLE)
    while main_config(init, data_root):
        time.sleep(.05)
    return DB


def api_config(data_root):
    """Request API config from user and set"""
    code, hash_value = DIALOG.inputbox("Enter your API Hash")
    if code == DIALOG.OK:
        if len(hash_value) != 32 or any(
            it not in string.hexdigits for it in hash_value
        ):
            DIALOG.msgbox("Invalid hash")
            return
        code, id_value = DIALOG.inputbox("Enter your API ID")
        if not id_value or any(it not in string.digits for it in id_value):
            DIALOG.msgbox("Invalid ID")
            return
        with open(
            os.path.join(
                data_root or os.path.dirname(utils.get_base_dir()), "api_token.txt"
            ),
            "w",
        ) as file:
            file.write(id_value + "\n" + hash_value)
        DIALOG.msgbox("API Token and ID set.")


def logging_config():
    """Ask the user to choose a loglevel and save it"""
    code, tag = DIALOG.menu(
        "Log Level",
        choices=[
            ("50", "CRITICAL"),
            ("40", "ERROR"),
            ("30", "WARNING"),
            ("20", "INFO"),
            ("10", "DEBUG"),
            ("0", "ALL"),
        ],
    )
    if code == DIALOG.OK:
        DB.setdefault(main.__name__, {})["loglevel"] = int(tag)


def factory_reset_check():
    """Make sure the user wants to factory reset"""
    global DB
    if (
        DIALOG.yesno(
            "Do you REALLY want to erase ALL userbot data stored in Telegram cloud?\n"
            "Your existing Telegram chats will not be affected."
        )
        == DIALOG.OK
    ):
        DB = None


def main_config(init, data_root):
    """Main menu"""
    if init:
        return api_config(data_root)
    choices = [
        ("API Token and ID", "Configure API Token and ID"),
        ("Modules", "Modular configuration"),
        ("Logging", "Configure debug output"),
        ("Factory reset", "Removes all userbot data stored in Telegram cloud"),
    ]
    code, tag = DIALOG.menu("Main Menu", choices=choices)
    if code != DIALOG.OK:
        return False
    if tag == "Modules":
        modules_config()
    if tag == "API Token and ID":
        api_config(data_root)
    if tag == "Logging":
        logging_config()
    if tag == "Factory reset":
        factory_reset_check()
        return False
    return True