#!/usr/bin/env python
#
# A library that provides a Python interface to the Telegram Bot API
# Copyright (C) 2015-2022
# Leandro Toledo de Souza <devs@python-telegram-bot.org>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser 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 Lesser Public License for more details.
#
# You should have received a copy of the GNU Lesser Public License
# along with this program.  If not, see [http://www.gnu.org/licenses/].
import inspect
import os
from typing import List

import httpx
import pytest
from bs4 import BeautifulSoup

import telegram
from tests.conftest import env_var_2_bool

IGNORED_OBJECTS = ("ResponseParameters", "CallbackGame")
IGNORED_PARAMETERS = {
    "self",
    "args",
    "_kwargs",
    "read_timeout",
    "write_timeout",
    "connect_timeout",
    "pool_timeout",
    "bot",
    "api_kwargs",
    "kwargs",
}

ignored_param_requirements = {  # Ignore these since there's convenience params in them (eg. Venue)
    "send_location": {"latitude", "longitude"},
    "edit_message_live_location": {"latitude", "longitude"},
    "send_venue": {"latitude", "longitude", "title", "address"},
    "send_contact": {"phone_number", "first_name"},
}


def find_next_sibling_until(tag, name, until):
    for sibling in tag.next_siblings:
        if sibling is until:
            return
        if sibling.name == name:
            return sibling


def parse_table(h4) -> List[List[str]]:
    """Parses the Telegram doc table and has an output of a 2D list."""
    table = find_next_sibling_until(h4, "table", h4.find_next_sibling("h4"))
    if not table:
        return []
    t = []
    for tr in table.find_all("tr")[1:]:
        t.append([td.text for td in tr.find_all("td")])
    return t


def check_method(h4):
    name = h4.text  # name of the method in telegram's docs.
    method = getattr(telegram.Bot, name)  # Retrieve our lib method
    table = parse_table(h4)

    # Check arguments based on source
    sig = inspect.signature(method, follow_wrapped=True)

    checked = []
    for parameter in table:
        param = sig.parameters.get(parameter[0])
        assert param is not None, f"Parameter {parameter[0]} not found in {method.__name__}"

        # TODO: Check type via docstring
        assert check_required_param(
            parameter, param.name, sig, method.__name__
        ), f"Param {param.name!r} of method {method.__name__!r} requirement mismatch!"
        checked.append(parameter[0])

    ignored = IGNORED_PARAMETERS.copy()
    if name == "getUpdates":
        ignored -= {"timeout"}  # Has it's own timeout parameter that we do wanna check for
    elif name in (
        f"send{media_type}"
        for media_type in [
            "Animation",
            "Audio",
            "Document",
            "Photo",
            "Video",
            "VideoNote",
            "Voice",
        ]
    ):
        ignored |= {"filename"}  # Convenience parameter
    elif name == "sendContact":
        ignored |= {"contact"}  # Added for ease of use
    elif name in ["sendLocation", "editMessageLiveLocation"]:
        ignored |= {"location"}  # Added for ease of use
    elif name == "sendVenue":
        ignored |= {"venue"}  # Added for ease of use
    elif name == "answerInlineQuery":
        ignored |= {"current_offset"}  # Added for ease of use

    assert (sig.parameters.keys() ^ checked) - ignored == set()


def check_object(h4):
    name = h4.text
    obj = getattr(telegram, name)
    table = parse_table(h4)

    # Check arguments based on source. Makes sure to only check __init__'s signature & nothing else
    sig = inspect.signature(obj.__init__, follow_wrapped=True)

    checked = set()
    for parameter in table:
        field = parameter[0]
        if field == "from":
            field = "from_user"
        elif (
            name.startswith("InlineQueryResult")
            or name.startswith("InputMedia")
            or name.startswith("BotCommandScope")
            or name.startswith("MenuButton")
        ) and field == "type":
            continue
        elif (name.startswith("ChatMember")) and field == "status":  # We autofill the status
            continue
        elif (
            name.startswith("PassportElementError") and field == "source"
        ) or field == "remove_keyboard":
            continue
        elif name.startswith("ForceReply") and field == "force_reply":  # this param is always True
            continue

        param = sig.parameters.get(field)
        assert param is not None, f"Attribute {field} not found in {obj.__name__}"
        # TODO: Check type via docstring
        assert check_required_param(
            parameter, field, sig, obj.__name__
        ), f"{obj.__name__!r} parameter {param.name!r} requirement mismatch"
        checked.add(field)

    ignored = IGNORED_PARAMETERS.copy()
    if name == "InputFile":
        return
    if name == "InlineQueryResult":
        ignored |= {"id", "type"}  # attributes common to all subclasses
    if name == "ChatMember":
        ignored |= {"user", "status"}  # attributes common to all subclasses
    if name == "BotCommandScope":
        ignored |= {"type"}  # attributes common to all subclasses
    if name == "MenuButton":
        ignored |= {"type"}  # attributes common to all subclasses
    elif name in ("PassportFile", "EncryptedPassportElement"):
        ignored |= {"credentials"}
    elif name == "PassportElementError":
        ignored |= {"message", "type", "source"}
    elif name == "InputMedia":
        ignored |= {"caption", "caption_entities", "media", "media_type", "parse_mode"}
    elif name.startswith("InputMedia"):
        ignored |= {"filename"}  # Convenience parameter

    assert (sig.parameters.keys() ^ checked) - ignored == set()


def check_required_param(
    param_desc: List[str], param_name: str, sig: inspect.Signature, method_or_obj_name: str
) -> bool:
    """Checks if the method/class parameter is a required/optional param as per Telegram docs."""
    if len(param_desc) == 4:  # this means that there is a dedicated 'Required' column present.
        # Handle cases where we provide convenience intentionally-
        if param_name in ignored_param_requirements.get(method_or_obj_name, {}):
            return True
        is_required = True if param_desc[2] in {"Required", "Yes"} else False
        is_ours_required = sig.parameters[param_name].default is inspect.Signature.empty
        return is_required is is_ours_required

    if len(param_desc) == 3:  # The docs mention the requirement in the description for classes...
        if param_name in ignored_param_requirements.get(method_or_obj_name, {}):
            return True
        is_required = False if param_desc[2].split(".", 1)[0] == "Optional" else True
        is_ours_required = sig.parameters[param_name].default is inspect.Signature.empty
        return is_required is is_ours_required


argvalues = []
names = []
request = httpx.get("https://core.telegram.org/bots/api")
soup = BeautifulSoup(request.text, "html.parser")

for thing in soup.select("h4 > a.anchor"):
    # Methods and types don't have spaces in them, luckily all other sections of the docs do
    # TODO: don't depend on that
    if "-" not in thing["name"]:
        h4 = thing.parent

        # Is it a method
        if h4.text[0].lower() == h4.text[0]:
            argvalues.append((check_method, h4))
            names.append(h4.text)
        elif h4.text not in IGNORED_OBJECTS:  # Or a type/object
            argvalues.append((check_object, h4))
            names.append(h4.text)


@pytest.mark.parametrize(("method", "data"), argvalues=argvalues, ids=names)
@pytest.mark.skipif(
    not env_var_2_bool(os.getenv("TEST_OFFICIAL")), reason="test_official is not enabled"
)
def test_official(method, data):
    method(data)