"""
Provides access to the models stored in the database, via the server.
"""
import datetime
import logging
from typing import NamedTuple, Sequence, Tuple, Any, Optional
from urllib.parse import urljoin

import requests


LOG = logging.getLogger(__name__)

SERVER_URL = "http://127.0.0.1:5000"
DATETIME_FORMAT = "%Y-%m-%dT%H:%M:%S.%f"


class ServerStatus:
    """ Provides helper classes to check whether the server is up. """

    @classmethod
    def is_server_running(cls) -> Tuple[bool, Any]:
        try:
            req = requests.get(urljoin(SERVER_URL, "ping"))

            if req.status_code == 200:
                return True, req.content
            return False, req.content

        except requests.ConnectionError as ex:
            return False, ex

    @classmethod
    def unsettled_consumptions(cls) -> dict:
        req = requests.get(urljoin(SERVER_URL, "status"))

        data = req.json()

        if data["unsettled"]["amount"]:
            data["unsettled"]["first"] = datetime.datetime.strptime(
                data["unsettled"]["first"], DATETIME_FORMAT
            )
            data["unsettled"]["last"] = datetime.datetime.strptime(
                data["unsettled"]["last"], DATETIME_FORMAT
            )

        return data


class Person(NamedTuple):
    """ Represents a Person, as retrieved from the database. """

    full_name: str
    display_name: Optional[str]
    active: bool = True
    person_id: Optional[int] = None
    consumptions: dict = {}

    @property
    def name(self) -> str:
        return self.display_name or self.full_name

    def add_consumption(self, type_id: str) -> bool:
        """ Register a consumption for this Person. """
        req = requests.post(
            urljoin(SERVER_URL, f"people/{self.person_id}/add_consumption/{type_id}")
        )
        try:
            data = req.json()

            if "error" in data:
                LOG.error(
                    "Could not add consumption for %s (%s): %s",
                    self.person_id,
                    req.status_code,
                    data,
                )
                return False

            self.consumptions.update(data["person"]["consumptions"])

            return Consumption.from_dict(data["consumption"])
        except ValueError:
            LOG.error(
                "Did not get JSON on adding Consumption (%s): %s",
                req.status_code,
                req.content,
            )
            return False

    def create(self) -> "Person":
        """ Create a new Person from the current attributes. As tuples are
        immutable, a new Person with the correct id is returned. """
        req = requests.post(
            urljoin(SERVER_URL, "people"),
            json={"person": {"name": self.name, "active": True}},
        )

        try:
            data = req.json()
        except ValueError:
            LOG.error(
                "Did not get JSON on adding Person (%s): %s",
                req.status_code,
                req.content,
            )
            return None

        if "error" in data or req.status_code != 201:
            LOG.error("Could not create Person (%s): %s", req.status_code, data)
            return None

        return Person.from_dict(data["person"])

    def set_active(self, new_state=True) -> "Person":
        req = requests.patch(
            urljoin(SERVER_URL, f"people/{self.person_id}"),
            json={"person": {"active": new_state}},
        )

        try:
            data = req.json()
        except ValueError:
            LOG.error(
                "Did not get JSON on updating Person (%s): %s",
                req.status_code,
                req.content,
            )
            return None

        if "error" in data or req.status_code != 200:
            LOG.error("Could not update Person (%s): %s", req.status_code, data)
            return None

        return Person.from_dict(data["person"])

    @classmethod
    def get(cls, person_id: int) -> "Person":
        """ Retrieve a Person by id. """
        req = requests.get(urljoin(SERVER_URL, f"/people/{person_id}"))

        try:
            data = req.json()

            if "error" in data:
                LOG.warning(
                    "Could not get person %s (%s): %s", person_id, req.status_code, data
                )
                return None

            return Person.from_dict(data["person"])

        except ValueError:
            LOG.error(
                "Did not get JSON from server on getting Person (%s): %s",
                req.status_code,
                req.content,
            )
            return None

    @classmethod
    def get_all(cls, active=None) -> ["Person"]:
        """ Get all active People. """
        params = {}
        if active is not None:
            params["active"] = int(active)

        req = requests.get(urljoin(SERVER_URL, "/people"), params=params)

        try:
            data = req.json()

            if "error" in data:
                LOG.warning("Could not get people (%s): %s", req.status_code, data)

            return [Person.from_dict(item) for item in data["people"]]

        except ValueError:
            LOG.error(
                "Did not get JSON from server on getting People (%s): %s",
                req.status_code,
                req.content,
            )
            return None

    @classmethod
    def from_dict(cls, data: dict) -> "Person":
        """ Reconstruct a Person object from a dict. """
        return Person(
            full_name=data["full_name"],
            display_name=data["display_name"],
            active=data["active"],
            person_id=data["person_id"],
            consumptions=data["consumptions"],
        )


class Export(NamedTuple):
    created_at: datetime.datetime
    settlement_ids: Sequence[int]
    export_id: int
    settlements: Sequence["Settlement"] = []

    @classmethod
    def from_dict(cls, data: dict) -> "Export":
        """ Reconstruct an Export from a dict. """
        return cls(
            export_id=data["export_id"],
            created_at=datetime.datetime.strptime(data["created_at"], DATETIME_FORMAT),
            settlement_ids=data["settlement_ids"],
            settlements=data.get("settlements", []),
        )

    @classmethod
    def get_all(cls) -> ["Export"]:
        """ Get a list of all existing Exports. """
        req = requests.get(urljoin(SERVER_URL, "exports"))

        try:
            data = req.json()
        except ValueError:
            LOG.error(
                "Did not get JSON on listing Exports (%s): %s",
                req.status_code,
                req.content,
            )
            return None

        if "error" in data or req.status_code != 200:
            LOG.error("Could not list Exports (%s): %s", req.status_code, data)
            return None

        return [cls.from_dict(e) for e in data["exports"]]

    @classmethod
    def get(cls, export_id: int) -> "Export":
        """ Retrieve one Export. """
        req = requests.get(urljoin(SERVER_URL, f"exports/{export_id}"))

        try:
            data = req.json()
        except ValueError:
            LOG.error(
                "Did not get JSON on getting Export (%s): %s",
                req.status_code,
                req.content,
            )
            return None

        if "error" in data or req.status_code != 200:
            LOG.error("Could not get Export (%s): %s", req.status_code, data)
            return None

        data["export"]["settlements"] = data["settlements"]

        return cls.from_dict(data["export"])

    @classmethod
    def create(cls) -> "Export":
        """ Create a new Export, containing all un-exported Settlements. """
        req = requests.post(urljoin(SERVER_URL, "exports"))

        try:
            data = req.json()
        except ValueError:
            LOG.error(
                "Did not get JSON on adding Export (%s): %s",
                req.status_code,
                req.content,
            )
            return None

        if "error" in data or req.status_code != 201:
            LOG.error("Could not create Export (%s): %s", req.status_code, data)
            return None

        data["export"]["settlements"] = data["settlements"]

        return cls.from_dict(data["export"])


class ConsumptionType(NamedTuple):
    """ Represents a stored ConsumptionType. """

    name: str
    consumption_type_id: int = None
    icon: str = None

    def create(self) -> "ConsumptionType":
        """ Create a new ConsumptionType from the current attributes. As tuples
        are immutable, a new ConsumptionType with the correct id is returned.
        """
        req = requests.post(
            urljoin(SERVER_URL, "consumption_types"),
            json={"consumption_type": {"name": self.name, "icon": self.icon}},
        )

        try:
            data = req.json()
        except ValueError:
            LOG.error(
                "Did not get JSON on adding ConsumptionType (%s): %s",
                req.status_code,
                req.content,
            )
            return None

        if "error" in data or req.status_code != 201:
            LOG.error(
                "Could not create ConsumptionType (%s): %s", req.status_code, data
            )
            return None

        return ConsumptionType.from_dict(data["consumption_type"])

    @classmethod
    def get(cls, consumption_type_id: int) -> "ConsumptionType":
        """ Retrieve a ConsumptionType by id. """
        req = requests.get(
            urljoin(SERVER_URL, f"/consumption_types/{consumption_type_id}")
        )

        try:
            data = req.json()

            if "error" in data:
                LOG.warning(
                    "Could not get consumption type %s (%s): %s",
                    consumption_type_id,
                    req.status_code,
                    data,
                )
                return None

            return cls.from_dict(data["consumption_type"])

        except ValueError:
            LOG.error(
                "Did not get JSON from server on getting consumption type (%s): %s",
                req.status_code,
                req.content,
            )
            return None

    @classmethod
    def get_all(cls) -> ["ConsumptionType"]:
        """ Get all active ConsumptionTypes. """
        req = requests.get(urljoin(SERVER_URL, "/consumption_types"))

        try:
            data = req.json()

            if "error" in data:
                LOG.warning(
                    "Could not get consumption types (%s): %s", req.status_code, data
                )

            return [cls.from_dict(item) for item in data["consumption_types"]]

        except ValueError:
            LOG.error(
                "Did not get JSON from server on getting ConsumptionTypes (%s): %s",
                req.status_code,
                req.content,
            )
            return None

    @classmethod
    def from_dict(cls, data: dict) -> "ConsumptionType":
        """ Reconstruct a ConsumptionType from a dict. """
        return cls(
            name=data["name"],
            consumption_type_id=data["consumption_type_id"],
            icon=data.get("icon"),
        )


class Consumption(NamedTuple):
    """ Represents a stored Consumption. """

    consumption_id: int
    person_id: int
    consumption_type_id: int
    created_at: datetime.datetime
    reversed: bool = False
    settlement_id: int = None

    @classmethod
    def from_dict(cls, data: dict) -> "Consumption":
        """ Reconstruct a Consumption from a dict. """
        return cls(
            consumption_id=data["consumption_id"],
            person_id=data["person_id"],
            consumption_type_id=data["consumption_type_id"],
            settlement_id=data["settlement_id"],
            created_at=datetime.datetime.strptime(data["created_at"], DATETIME_FORMAT),
            reversed=data["reversed"],
        )

    def reverse(self) -> "Consumption":
        """ Reverse this consumption. """
        req = requests.delete(
            urljoin(SERVER_URL, f"/consumptions/{self.consumption_id}")
        )

        try:
            data = req.json()

            if "error" in data:
                LOG.error(
                    "Could not reverse consumption %s (%s): %s",
                    self.consumption_id,
                    req.status_code,
                    data,
                )
                return False

            return Consumption.from_dict(data["consumption"])

        except ValueError:
            LOG.error(
                "Did not get JSON on reversing Consumption (%s): %s",
                req.status_code,
                req.content,
            )
            return False


class Settlement(NamedTuple):
    """ Represents a stored Settlement. """

    settlement_id: int
    name: str
    consumption_summary: dict
    count_info: dict = {}

    @classmethod
    def from_dict(cls, data: dict) -> "Settlement":
        return Settlement(
            settlement_id=data["settlement_id"],
            name=data["name"],
            consumption_summary=data["consumption_summary"],
            count_info=data.get("count_info", {}),
        )

    @classmethod
    def create(cls, name: str) -> "Settlement":
        req = requests.post(
            urljoin(SERVER_URL, "/settlements"), json={"settlement": {"name": name}}
        )

        return cls.from_dict(req.json()["settlement"])

    @classmethod
    def get(cls, settlement_id: int) -> "Settlement":
        req = requests.get(urljoin(SERVER_URL, f"/settlements/{settlement_id}"))

        try:
            data = req.json()
        except ValueError:
            LOG.error(
                "Did not get JSON on retrieving Settlement (%s): %s",
                req.status_code,
                req.content,
            )
            return None

        if "error" in data or req.status_code != 200:
            LOG.error("Could not get Export (%s): %s", req.status_code, data)
            return None

        data["settlement"]["count_info"] = data["count_info"]

        return cls.from_dict(data["settlement"])