import requests
from requests import HTTPError
from pbincli.utils import PBinCLIError


def _config_requests(settings=None, shortener=False):
    settings = settings or {}
    if settings.get("no_insecure_warning"):
        from requests.packages.urllib3.exceptions import InsecureRequestWarning

        requests.packages.urllib3.disable_warnings(InsecureRequestWarning)

    session = requests.Session()
    session.verify = not settings.get("no_check_certificate")

    if (
        settings.get("auth") and not shortener
    ):  # do not leak PrivateBin authorization to shortener services
        auth = settings["auth"]
        if auth == "basic" and all(
            [settings.get("auth_user"), settings.get("auth_pass")]
        ):
            session.auth = (settings["auth_user"], settings["auth_pass"])
        elif auth == "custom" and settings.get("auth_custom"):
            from json import loads as json_loads

            auth = json_loads(settings["auth_custom"])
            session.headers.update(auth)
        else:
            PBinCLIError("Incorrect authorization configuration")

    if settings.get("proxy"):
        scheme = settings["proxy"].split("://")[0]
        if scheme.startswith("socks"):
            session.proxies.update(
                {"http": settings["proxy"], "https": settings["proxy"]}
            )
        else:
            session.proxies.update({scheme: settings["proxy"]})

    return session


class PrivateBin:
    def __init__(self, settings=None):
        settings = settings or {}
        if not settings.get("server"):
            PBinCLIError("No server specified - unable to continue")

        self.server = settings["server"]
        self.headers = {"X-Requested-With": "JSONHttpRequest"}

        self.session = _config_requests(settings, False)

    def post(self, request):
        result = self.session.post(url=self.server, headers=self.headers, data=request)

        try:
            return result.json()
        except ValueError:
            PBinCLIError(
                "Unable parse response as json. Received (size = {}):\n{}".format(
                    len(result.text), result.text
                )
            )

    def get(self, request):
        return self.session.get(
            url=self.server + "?" + request, headers=self.headers
        ).json()

    def delete(self, request):
        # using try as workaround for versions < 1.3 due to we cant detect
        # if server used version 1.2, where auto-deletion is added
        try:
            result = self.session.post(
                url=self.server, headers=self.headers, data=request
            ).json()
        except ValueError:
            # unable parse response as json because it can be empty (1.2), so simulate correct answer
            print(
                "NOTICE: Received empty response. We interpret that as our paste has already been deleted."
            )
            from json import loads as json_loads

            result = json_loads('{"status":0}')

        if not result["status"]:
            print("Paste successfully deleted!")
        elif result["status"]:
            PBinCLIError(
                "Something went wrong...\nError:\t\t{}".format(result["message"])
            )
        else:
            PBinCLIError("Something went wrong...\nError: Empty response.")

    def getVersion(self):
        result = self.session.get(
            url=self.server + "?jsonld=paste", headers=self.headers
        )
        try:
            jsonldSchema = result.json()
            return (
                jsonldSchema["@context"]["v"]["@value"]
                if (
                    "@context" in jsonldSchema
                    and "v" in jsonldSchema["@context"]
                    and "@value" in jsonldSchema["@context"]["v"]
                )
                else 1
            )
        except ValueError:
            PBinCLIError(
                "Unable parse response as json. Received (size = {}):\n{}".format(
                    len(result.text), result.text
                )
            )

    def getServer(self):
        return self.server


class Shortener:
    """Some parts of this class was taken from
    python-yourls (https://github.com/tflink/python-yourls/) library
    """

    def __init__(self, settings=None):
        settings = settings or {}
        self.api = settings.get("short_api")
        if self.api is None:
            PBinCLIError("Unable to activate link shortener without short_api.")

        # we checking which service is used, because some services doesn't require
        # any authentication, or have only one domain on which it working
        if self.api == "yourls":
            self._yourls_init(settings)
        elif self.api == "isgd" or self.api == "vgd":
            self._gd_init()
        elif self.api == "custom":
            self.apiurl = settings.get("short_url")
            if not self.apiurl:
                PBinCLIError("short_url is required for custom shortener")

        self.session = _config_requests(settings, True)

    def _yourls_init(self, settings):
        apiurl = settings["short_url"]
        if not apiurl:
            PBinCLIError("YOURLS: An API URL is required")

        # setting API URL
        if apiurl.endswith("/yourls-api.php"):
            self.apiurl = apiurl
        elif apiurl.endswith("/"):
            self.apiurl = apiurl + "yourls-api.php"
        else:
            PBinCLIError(
                "YOURLS: Incorrect URL is provided.\n"
                + "It must contain full address to 'yourls-api.php' script (like https://example.com/yourls-api.php)\n"
                + "or just contain instance URL with '/' at the end (like https://example.com/)"
            )

        # validating for required credentials
        if (
            settings.get("short_user")
            and settings.get("short_pass")
            and settings.get("short_token") is None
        ):
            self.auth_args = {
                "username": settings["short_user"],
                "password": settings["short_pass"],
            }
        elif (
            settings.get("short_user") is None
            and settings.get("short_pass") is None
            and settings.get("short_token")
        ):
            self.auth_args = {"signature": settings["short_token"]}
        elif (
            settings.get("short_user") is None
            and settings.get("short_pass") is None
            and settings.get("short_token") is None
        ):
            self.auth_args = {}
        else:
            PBinCLIError(
                "YOURLS: either username and password or token are required. Otherwise set to default (None)"
            )

    def _gd_init(self):
        if self.api == "isgd":
            self.apiurl = "https://is.gd/"
        else:
            self.apiurl = "https://v.gd/"
        self.useragent = (
            "Mozilla/5.0 (compatible; pbincli - https://github.com/r4sas/pbincli/)"
        )

    def getlink(self, url):
        # that is api -> function mapper for running service-related function when getlink() used
        servicesList = {
            "yourls": self._yourls,
            "clckru": self._clckru,
            "tinyurl": self._tinyurl,
            "isgd": self._gd,
            "vgd": self._gd,
            "cuttly": self._cuttly,
            "custom": self._custom,
        }
        # run function selected by choosen API
        return servicesList[self.api](url)

    def _yourls(self, url):
        request = {"action": "shorturl", "format": "json", "url": url}
        request.update(self.auth_args)

        result = self.session.post(url=self.apiurl, data=request)

        try:
            result.raise_for_status()
        except HTTPError:
            try:
                response = result.json()
            except ValueError:
                PBinCLIError(
                    "YOURLS: Unable parse response. Received (size = {}):\n{}".format(
                        len(result.text), result.text
                    )
                )
            else:
                PBinCLIError(
                    "YOURLS: Received error from API: {} with JSON {}".format(
                        result, response
                    )
                )
        else:
            response = result.json()

            if {"status", "statusCode", "message"} <= set(response.keys()):
                if response["status"] == "fail":
                    PBinCLIError(
                        "YOURLS: Received error from API: {}".format(
                            response["message"]
                        )
                    )
                if not "shorturl" in response:
                    PBinCLIError(
                        "YOURLS: Unknown error: {}".format(response["message"])
                    )
                else:
                    return response["shorturl"]
            else:
                PBinCLIError(
                    "YOURLS: No status, statusCode or message fields in response! Received:\n{}".format(
                        response
                    )
                )

    def _clckru(self, url):
        request = {"url": url}

        try:
            result = self.session.post(url="https://clck.ru/--", data=request)
            return result.text
        except Exception as ex:
            PBinCLIError("clck.ru: unexcepted behavior: {}".format(ex))

    def _tinyurl(self, url):
        request = {"url": url}

        try:
            result = self.session.post(
                url="https://tinyurl.com/api-create.php", data=request
            )
            return result.text
        except Exception as ex:
            PBinCLIError("TinyURL: unexcepted behavior: {}".format(ex))

    def _gd(self, url):
        request = {
            "format": "json",
            "url": url,
            "logstats": 0,  # we don't want use any statistics
        }
        headers = {"User-Agent": self.useragent}

        try:
            result = self.session.post(
                url=self.apiurl + "create.php", headers=headers, data=request
            )

            response = result.json()

            if "shorturl" in response:
                return response["shorturl"]
            else:
                PBinCLIError(
                    "{}: got error {} from API: {}".format(
                        "is.gd" if self.api == "isgd" else "v.gd",
                        response["errorcode"],
                        response["errormessage"],
                    )
                )

        except Exception as ex:
            PBinCLIError(
                "{}: unexcepted behavior: {}".format(
                    "is.gd" if self.api == "isgd" else "v.gd", ex
                )
            )

    def _cuttly(self, url):
        request = {"url": url, "domain": 0}

        try:
            result = self.session.post(
                url="https://cutt.ly/scripts/shortenUrl.php", data=request
            )
            return result.text
        except Exception as ex:
            PBinCLIError("cutt.ly: unexcepted behavior: {}".format(ex))

    def _custom(self, url):
        if self.apiurl is None:
            PBinCLIError("No short_url specified - link will not be shortened.")

        from urllib.parse import quote

        qUrl = quote(url, safe="")  # urlencoded paste url
        rUrl = self.apiurl.replace("{{url}}", qUrl)

        try:
            result = self.session.get(url=rUrl)
            return result.text
        except Exception as ex:
            PBinCLIError("Shorter: unexcepted behavior: {}".format(ex))