from __future__ import annotations

import base64
import hashlib
import hmac
import logging
import math
import secrets
import string
import time

import aiohttp
from aiohttp import ContentTypeError, FormData
from pyrate_limiter import BucketFullException, Duration, Limiter, Rate

from roborock.containers import HomeData, HomeDataRoom, HomeDataScene, ProductResponse, RRiot, UserData
from roborock.exceptions import (
    RoborockAccountDoesNotExist,
    RoborockException,
    RoborockInvalidCode,
    RoborockInvalidCredentials,
    RoborockInvalidEmail,
    RoborockInvalidUserAgreement,
    RoborockMissingParameters,
    RoborockNoUserAgreement,
    RoborockRateLimit,
    RoborockTooFrequentCodeRequests,
    RoborockTooManyRequest,
    RoborockUrlException,
)

_LOGGER = logging.getLogger(__name__)


class RoborockApiClient:
    _LOGIN_RATES = [
        Rate(1, Duration.SECOND),
        Rate(3, Duration.MINUTE),
        Rate(10, Duration.HOUR),
        Rate(20, Duration.DAY),
    ]
    _HOME_DATA_RATES = [
        Rate(1, Duration.SECOND),
        Rate(5, Duration.MINUTE),
        Rate(15, Duration.HOUR),
        Rate(40, Duration.DAY),
    ]

    _login_limiter = Limiter(_LOGIN_RATES)
    _home_data_limiter = Limiter(_HOME_DATA_RATES)

    def __init__(self, username: str, base_url=None, session: aiohttp.ClientSession | None = None) -> None:
        """Sample API Client."""
        self._username = username
        self._default_url = "https://euiot.roborock.com"
        self.base_url = base_url
        self._device_identifier = secrets.token_urlsafe(16)
        self.session = session

    async def _get_base_url(self) -> str:
        if not self.base_url:
            url_request = PreparedRequest(self._default_url, self.session)
            response = await url_request.request(
                "post",
                "/api/v1/getUrlByEmail",
                params={"email": self._username, "needtwostepauth": "false"},
            )
            if response is None:
                raise RoborockUrlException("get url by email returned None")
            response_code = response.get("code")
            if response_code != 200:
                _LOGGER.info("Get base url failed for %s with the following context: %s", self._username, response)
                if response_code == 2003:
                    raise RoborockInvalidEmail("Your email was incorrectly formatted.")
                elif response_code == 1001:
                    raise RoborockMissingParameters(
                        "You are missing parameters for this request, are you sure you entered your username?"
                    )
                elif response_code == 9002:
                    raise RoborockTooManyRequest("Please temporarily disable making requests and try again later.")
                raise RoborockUrlException(f"error code: {response_code} msg: {response.get('error')}")
            response_data = response.get("data")
            if response_data is None:
                raise RoborockUrlException("response does not have 'data'")
            self.base_url = response_data.get("url")
        return self.base_url

    def _get_header_client_id(self):
        md5 = hashlib.md5()
        md5.update(self._username.encode())
        md5.update(self._device_identifier.encode())
        return base64.b64encode(md5.digest()).decode()

    async def nc_prepare(self, user_data: UserData, timezone: str) -> dict:
        """This gets a few critical parameters for adding a device to your account."""
        if (
            user_data.rriot is None
            or user_data.rriot.r is None
            or user_data.rriot.u is None
            or user_data.rriot.r.a is None
        ):
            raise RoborockException("Your userdata is missing critical attributes.")
        base_url = user_data.rriot.r.a
        prepare_request = PreparedRequest(base_url, self.session)
        hid = await self._get_home_id(user_data)

        data = FormData()
        data.add_field("hid", hid)
        data.add_field("tzid", timezone)

        prepare_response = await prepare_request.request(
            "post",
            "/nc/prepare",
            headers={
                "Authorization": _get_hawk_authentication(
                    user_data.rriot, "/nc/prepare", {"hid": hid, "tzid": timezone}
                ),
            },
            data=data,
        )

        if prepare_response is None:
            raise RoborockException("prepare_response is None")
        if not prepare_response.get("success"):
            raise RoborockException(f"{prepare_response.get('msg')} - response code: {prepare_response.get('code')}")

        return prepare_response["result"]

    async def add_device(self, user_data: UserData, s: str, t: str) -> dict:
        """This will add a new device to your account
        it is recommended to only use this during a pairing cycle with a device.
        Please see here: https://github.com/Python-roborock/Roborockmitmproxy/blob/main/handshake_protocol.md
        """
        if (
            user_data.rriot is None
            or user_data.rriot.r is None
            or user_data.rriot.u is None
            or user_data.rriot.r.a is None
        ):
            raise RoborockException("Your userdata is missing critical attributes.")
        base_url = user_data.rriot.r.a
        add_device_request = PreparedRequest(base_url, self.session)

        add_device_response = await add_device_request.request(
            "GET",
            "/user/devices/newadd",
            headers={
                "Authorization": _get_hawk_authentication(
                    user_data.rriot, "/user/devices/newadd", params={"s": s, "t": t}
                ),
            },
            params={"s": s, "t": t},
        )

        if add_device_response is None:
            raise RoborockException("add_device is None")
        if not add_device_response.get("success"):
            raise RoborockException(
                f"{add_device_response.get('msg')} - response code: {add_device_response.get('code')}"
            )

        return add_device_response["result"]

    async def request_code(self) -> None:
        try:
            self._login_limiter.try_acquire("login")
        except BucketFullException as ex:
            _LOGGER.info(ex.meta_info)
            raise RoborockRateLimit("Reached maximum requests for login. Please try again later.") from ex
        base_url = await self._get_base_url()
        header_clientid = self._get_header_client_id()
        code_request = PreparedRequest(base_url, self.session, {"header_clientid": header_clientid})

        code_response = await code_request.request(
            "post",
            "/api/v1/sendEmailCode",
            params={
                "username": self._username,
                "type": "auth",
            },
        )
        if code_response is None:
            raise RoborockException("Failed to get a response from send email code")
        response_code = code_response.get("code")
        if response_code != 200:
            _LOGGER.info("Request code failed for %s with the following context: %s", self._username, code_response)
            if response_code == 2008:
                raise RoborockAccountDoesNotExist("Account does not exist - check your login and try again.")
            elif response_code == 9002:
                raise RoborockTooFrequentCodeRequests("You have attempted to request too many codes. Try again later")
            else:
                raise RoborockException(f"{code_response.get('msg')} - response code: {code_response.get('code')}")

    async def request_code_v4(self) -> None:
        """Request a code using the v4 endpoint."""
        try:
            self._login_limiter.try_acquire("login")
        except BucketFullException as ex:
            _LOGGER.info(ex.meta_info)
            raise RoborockRateLimit("Reached maximum requests for login. Please try again later.") from ex
        base_url = await self._get_base_url()
        header_clientid = self._get_header_client_id()
        code_request = PreparedRequest(
            base_url,
            self.session,
            {
                "header_clientid": header_clientid,
                "Content-Type": "application/x-www-form-urlencoded",
                "header_clientlang": "en",
            },
        )

        code_response = await code_request.request(
            "post",
            "/api/v4/email/code/send",
            params={"email": self._username, "type": "login", "platform": ""},
        )
        if code_response is None:
            raise RoborockException("Failed to get a response from send email code")
        response_code = code_response.get("code")
        if response_code != 200:
            _LOGGER.info("Request code failed for %s with the following context: %s", self._username, code_response)
            if response_code == 2008:
                raise RoborockAccountDoesNotExist("Account does not exist - check your login and try again.")
            elif response_code == 9002:
                raise RoborockTooFrequentCodeRequests("You have attempted to request too many codes. Try again later")
            else:
                raise RoborockException(f"{code_response.get('msg')} - response code: {code_response.get('code')}")

    async def _sign_key_v3(self, s: str) -> str:
        """Sign a randomly generated string."""
        base_url = await self._get_base_url()
        header_clientid = self._get_header_client_id()
        code_request = PreparedRequest(base_url, self.session, {"header_clientid": header_clientid})

        code_response = await code_request.request(
            "post",
            "/api/v3/key/sign",
            params={"s": s},
        )

        if not code_response or "data" not in code_response or "k" not in code_response["data"]:
            raise RoborockException("Failed to get a response from sign key")
        response_code = code_response.get("code")

        if response_code != 200:
            _LOGGER.info("Request code failed for %s with the following context: %s", self._username, code_response)
            raise RoborockException(f"{code_response.get('msg')} - response code: {code_response.get('code')}")

        return code_response["data"]["k"]

    async def code_login_v4(self, code: int | str, country: str, country_code: int) -> UserData:
        """
        Login via code authentication.
        :param code: The code from the email.
        :param country: The two-character representation of the country, i.e. "US"
        :param country_code: the country phone number code i.e. 1 for US.
        """
        base_url = await self._get_base_url()
        header_clientid = self._get_header_client_id()
        x_mercy_ks = "".join(secrets.choice(string.ascii_letters + string.digits) for _ in range(16))
        x_mercy_k = await self._sign_key_v3(x_mercy_ks)
        login_request = PreparedRequest(
            base_url,
            self.session,
            {"header_clientid": header_clientid, "x-mercy-ks": x_mercy_ks, "x-mercy-k": x_mercy_k},
        )
        login_response = await login_request.request(
            "post",
            "/api/v4/auth/email/login/code",
            params={
                "country": country,
                "countryCode": country_code,
                "email": self._username,
                "code": code,
                # Major and minor version are the user agreement version, we will need to see if this needs to be
                # dynamic https://usiot.roborock.com/api/v3/app/agreement/latest?country=US
                "majorVersion": 14,
                "minorVersion": 0,
            },
        )
        if login_response is None:
            raise RoborockException("Login request response is None")
        response_code = login_response.get("code")
        if response_code != 200:
            _LOGGER.info("Login failed for %s with the following context: %s", self._username, login_response)
            if response_code == 2018:
                raise RoborockInvalidCode("Invalid code - check your code and try again.")
            if response_code == 3009:
                raise RoborockNoUserAgreement("You must accept the user agreement in the Roborock app to continue.")
            if response_code == 3006:
                raise RoborockInvalidUserAgreement(
                    "User agreement must be accepted again - or you are attempting to use the Mi Home app account."
                )
            raise RoborockException(f"{login_response.get('msg')} - response code: {response_code}")
        user_data = login_response.get("data")
        if not isinstance(user_data, dict):
            raise RoborockException("Got unexpected data type for user_data")
        return UserData.from_dict(user_data)

    async def pass_login(self, password: str) -> UserData:
        try:
            self._login_limiter.try_acquire("login")
        except BucketFullException as ex:
            _LOGGER.info(ex.meta_info)
            raise RoborockRateLimit("Reached maximum requests for login. Please try again later.") from ex
        base_url = await self._get_base_url()
        header_clientid = self._get_header_client_id()

        login_request = PreparedRequest(base_url, self.session, {"header_clientid": header_clientid})
        login_response = await login_request.request(
            "post",
            "/api/v1/login",
            params={
                "username": self._username,
                "password": password,
                "needtwostepauth": "false",
            },
        )
        if login_response is None:
            raise RoborockException("Login response is none")
        if login_response.get("code") != 200:
            _LOGGER.info("Login failed for %s with the following context: %s", self._username, login_response)
            raise RoborockException(f"{login_response.get('msg')} - response code: {login_response.get('code')}")
        user_data = login_response.get("data")
        if not isinstance(user_data, dict):
            raise RoborockException("Got unexpected data type for user_data")
        return UserData.from_dict(user_data)

    async def pass_login_v3(self, password: str) -> UserData:
        """Seemingly it follows the format below, but password is encrypted in some manner.
        # login_response = await login_request.request(
        #     "post",
        #     "/api/v3/auth/email/login",
        #     params={
        #         "email": self._username,
        #         "password": password,
        #         "twoStep": 1,
        #         "version": 0
        #     },
        # )
        """
        raise NotImplementedError("Pass_login_v3 has not yet been implemented")

    async def code_login(self, code: int | str) -> UserData:
        base_url = await self._get_base_url()
        header_clientid = self._get_header_client_id()

        login_request = PreparedRequest(base_url, self.session, {"header_clientid": header_clientid})
        login_response = await login_request.request(
            "post",
            "/api/v1/loginWithCode",
            params={
                "username": self._username,
                "verifycode": code,
                "verifycodetype": "AUTH_EMAIL_CODE",
            },
        )
        if login_response is None:
            raise RoborockException("Login request response is None")
        response_code = login_response.get("code")
        if response_code != 200:
            _LOGGER.info("Login failed for %s with the following context: %s", self._username, login_response)
            if response_code == 2018:
                raise RoborockInvalidCode("Invalid code - check your code and try again.")
            if response_code == 3009:
                raise RoborockNoUserAgreement("You must accept the user agreement in the Roborock app to continue.")
            if response_code == 3006:
                raise RoborockInvalidUserAgreement(
                    "User agreement must be accepted again - or you are attempting to use the Mi Home app account."
                )
            raise RoborockException(f"{login_response.get('msg')} - response code: {response_code}")
        user_data = login_response.get("data")
        if not isinstance(user_data, dict):
            raise RoborockException("Got unexpected data type for user_data")
        return UserData.from_dict(user_data)

    async def _get_home_id(self, user_data: UserData):
        base_url = await self._get_base_url()
        header_clientid = self._get_header_client_id()
        home_id_request = PreparedRequest(base_url, self.session, {"header_clientid": header_clientid})
        home_id_response = await home_id_request.request(
            "get",
            "/api/v1/getHomeDetail",
            headers={"Authorization": user_data.token},
        )
        if home_id_response is None:
            raise RoborockException("home_id_response is None")
        if home_id_response.get("code") != 200:
            _LOGGER.info("Get Home Id failed with the following context: %s", home_id_response)
            if home_id_response.get("code") == 2010:
                raise RoborockInvalidCredentials(
                    f"Invalid credentials ({home_id_response.get('msg')}) - check your login and try again."
                )
            raise RoborockException(f"{home_id_response.get('msg')} - response code: {home_id_response.get('code')}")

        return home_id_response["data"]["rrHomeId"]

    async def get_home_data(self, user_data: UserData) -> HomeData:
        try:
            self._home_data_limiter.try_acquire("home_data")
        except BucketFullException as ex:
            _LOGGER.info(ex.meta_info)
            raise RoborockRateLimit("Reached maximum requests for home data. Please try again later.") from ex
        rriot = user_data.rriot
        if rriot is None:
            raise RoborockException("rriot is none")
        home_id = await self._get_home_id(user_data)
        if rriot.r.a is None:
            raise RoborockException("Missing field 'a' in rriot reference")
        home_request = PreparedRequest(
            rriot.r.a,
            self.session,
            {
                "Authorization": _get_hawk_authentication(rriot, f"/user/homes/{str(home_id)}"),
            },
        )
        home_response = await home_request.request("get", "/user/homes/" + str(home_id))
        if not home_response.get("success"):
            raise RoborockException(home_response)
        home_data = home_response.get("result")
        if isinstance(home_data, dict):
            return HomeData.from_dict(home_data)
        else:
            raise RoborockException("home_response result was an unexpected type")

    async def get_home_data_v2(self, user_data: UserData) -> HomeData:
        """This is the same as get_home_data, but uses a different endpoint and includes non-robotic vacuums."""
        try:
            self._home_data_limiter.try_acquire("home_data")
        except BucketFullException as ex:
            _LOGGER.info(ex.meta_info)
            raise RoborockRateLimit("Reached maximum requests for home data. Please try again later.") from ex
        rriot = user_data.rriot
        if rriot is None:
            raise RoborockException("rriot is none")
        home_id = await self._get_home_id(user_data)
        if rriot.r.a is None:
            raise RoborockException("Missing field 'a' in rriot reference")
        home_request = PreparedRequest(
            rriot.r.a,
            self.session,
            {
                "Authorization": _get_hawk_authentication(rriot, "/v2/user/homes/" + str(home_id)),
            },
        )
        home_response = await home_request.request("get", "/v2/user/homes/" + str(home_id))
        if not home_response.get("success"):
            raise RoborockException(home_response)
        home_data = home_response.get("result")
        if isinstance(home_data, dict):
            return HomeData.from_dict(home_data)
        else:
            raise RoborockException("home_response result was an unexpected type")

    async def get_home_data_v3(self, user_data: UserData) -> HomeData:
        """This is the same as get_home_data, but uses a different endpoint and includes non-robotic vacuums."""
        try:
            self._home_data_limiter.try_acquire("home_data")
        except BucketFullException as ex:
            _LOGGER.info(ex.meta_info)
            raise RoborockRateLimit("Reached maximum requests for home data. Please try again later.") from ex
        rriot = user_data.rriot
        home_id = await self._get_home_id(user_data)
        if rriot.r.a is None:
            raise RoborockException("Missing field 'a' in rriot reference")
        home_request = PreparedRequest(
            rriot.r.a,
            self.session,
            {
                "Authorization": _get_hawk_authentication(rriot, "/v3/user/homes/" + str(home_id)),
            },
        )
        home_response = await home_request.request("get", "/v3/user/homes/" + str(home_id))
        if not home_response.get("success"):
            raise RoborockException(home_response)
        home_data = home_response.get("result")
        if isinstance(home_data, dict):
            return HomeData.from_dict(home_data)
        raise RoborockException(f"home_response result was an unexpected type: {home_data}")

    async def get_rooms(self, user_data: UserData, home_id: int | None = None) -> list[HomeDataRoom]:
        rriot = user_data.rriot
        if rriot is None:
            raise RoborockException("rriot is none")
        if home_id is None:
            home_id = await self._get_home_id(user_data)
        if rriot.r.a is None:
            raise RoborockException("Missing field 'a' in rriot reference")
        room_request = PreparedRequest(
            rriot.r.a,
            self.session,
            {
                "Authorization": _get_hawk_authentication(rriot, "/v2/user/homes/" + str(home_id)),
            },
        )
        room_response = await room_request.request("get", f"/user/homes/{str(home_id)}/rooms" + str(home_id))
        if not room_response.get("success"):
            raise RoborockException(room_response)
        rooms = room_response.get("result")
        if isinstance(rooms, list):
            output_list = []
            for room in rooms:
                output_list.append(HomeDataRoom.from_dict(room))
            return output_list
        else:
            raise RoborockException("home_response result was an unexpected type")

    async def get_scenes(self, user_data: UserData, device_id: str) -> list[HomeDataScene]:
        rriot = user_data.rriot
        if rriot is None:
            raise RoborockException("rriot is none")
        if rriot.r.a is None:
            raise RoborockException("Missing field 'a' in rriot reference")
        scenes_request = PreparedRequest(
            rriot.r.a,
            self.session,
            {
                "Authorization": _get_hawk_authentication(rriot, f"/user/scene/device/{str(device_id)}"),
            },
        )
        scenes_response = await scenes_request.request("get", f"/user/scene/device/{str(device_id)}")
        if not scenes_response.get("success"):
            raise RoborockException(scenes_response)
        scenes = scenes_response.get("result")
        if isinstance(scenes, list):
            return [HomeDataScene.from_dict(scene) for scene in scenes]
        else:
            raise RoborockException("scene_response result was an unexpected type")

    async def execute_scene(self, user_data: UserData, scene_id: int) -> None:
        rriot = user_data.rriot
        if rriot is None:
            raise RoborockException("rriot is none")
        if rriot.r.a is None:
            raise RoborockException("Missing field 'a' in rriot reference")
        execute_scene_request = PreparedRequest(
            rriot.r.a,
            self.session,
            {
                "Authorization": _get_hawk_authentication(rriot, f"/user/scene/{str(scene_id)}/execute"),
            },
        )
        execute_scene_response = await execute_scene_request.request("POST", f"/user/scene/{str(scene_id)}/execute")
        if not execute_scene_response.get("success"):
            raise RoborockException(execute_scene_response)

    async def get_products(self, user_data: UserData) -> ProductResponse:
        """Gets all products and their schemas, good for determining status codes and model numbers."""
        base_url = await self._get_base_url()
        header_clientid = self._get_header_client_id()
        product_request = PreparedRequest(base_url, self.session, {"header_clientid": header_clientid})
        product_response = await product_request.request(
            "get",
            "/api/v4/product",
            headers={"Authorization": user_data.token},
        )
        if product_response is None:
            raise RoborockException("home_id_response is None")
        if product_response.get("code") != 200:
            raise RoborockException(f"{product_response.get('msg')} - response code: {product_response.get('code')}")
        result = product_response.get("data")
        if isinstance(result, dict):
            return ProductResponse.from_dict(result)
        raise RoborockException("product result was an unexpected type")

    async def download_code(self, user_data: UserData, product_id: int):
        base_url = await self._get_base_url()
        header_clientid = self._get_header_client_id()
        product_request = PreparedRequest(base_url, self.session, {"header_clientid": header_clientid})
        request = {"apilevel": 99999, "productids": [product_id], "type": 2}
        response = await product_request.request(
            "post",
            "/api/v1/appplugin",
            json=request,
            headers={"Authorization": user_data.token, "Content-Type": "application/json"},
        )
        return response["data"][0]["url"]

    async def download_category_code(self, user_data: UserData):
        base_url = await self._get_base_url()
        header_clientid = self._get_header_client_id()
        product_request = PreparedRequest(base_url, self.session, {"header_clientid": header_clientid})
        response = await product_request.request(
            "get",
            "api/v1/plugins?apiLevel=99999&type=2",
            headers={
                "Authorization": user_data.token,
            },
        )
        return {r["category"]: r["url"] for r in response["data"]["categoryPluginList"]}


class PreparedRequest:
    def __init__(
        self, base_url: str, session: aiohttp.ClientSession | None = None, base_headers: dict | None = None
    ) -> None:
        self.base_url = base_url
        self.base_headers = base_headers or {}
        self.session = session

    async def request(self, method: str, url: str, params=None, data=None, headers=None, json=None) -> dict:
        _url = "/".join(s.strip("/") for s in [self.base_url, url])
        _headers = {**self.base_headers, **(headers or {})}
        close_session = self.session is None
        session = self.session if self.session is not None else aiohttp.ClientSession()
        try:
            async with session.request(method, _url, params=params, data=data, headers=_headers, json=json) as resp:
                return await resp.json()
        except ContentTypeError as err:
            """If we get an error, lets log everything for debugging."""
            try:
                resp_json = await resp.json(content_type=None)
                _LOGGER.info("Resp: %s", resp_json)
            except ContentTypeError as err_2:
                _LOGGER.info(err_2)
            resp_raw = await resp.read()
            _LOGGER.info("Resp raw: %s", resp_raw)
            # Still raise the err so that it's clear it failed.
            raise err
        finally:
            if close_session:
                await session.close()


def _process_extra_hawk_values(values: dict | None) -> str:
    if values is None:
        return ""
    else:
        sorted_keys = sorted(values.keys())
        result = []
        for key in sorted_keys:
            value = values.get(key)
            result.append(f"{key}={value}")
        return hashlib.md5("&".join(result).encode()).hexdigest()


def _get_hawk_authentication(rriot: RRiot, url: str, formdata: dict | None = None, params: dict | None = None) -> str:
    timestamp = math.floor(time.time())
    nonce = secrets.token_urlsafe(6)
    formdata_str = _process_extra_hawk_values(formdata)
    params_str = _process_extra_hawk_values(params)

    prestr = ":".join(
        [
            rriot.u,
            rriot.s,
            nonce,
            str(timestamp),
            hashlib.md5(url.encode()).hexdigest(),
            params_str,
            formdata_str,
        ]
    )
    mac = base64.b64encode(hmac.new(rriot.h.encode(), prestr.encode(), hashlib.sha256).digest()).decode()
    return f'Hawk id="{rriot.u}",s="{rriot.s}",ts="{timestamp}",nonce="{nonce}",mac="{mac}"'