'''
Provides access to the models stored in the database, via the server.
'''
from typing import NamedTuple
from urllib.parse import urljoin

import requests

from . import logger

LOG = logger.getLogger('model')

SERVER_URL = "http://127.0.0.1:5000"

class Person(NamedTuple):
    ''' Represents a Person, as retrieved from the database. '''
    name: str
    person_id: int = None
    consumptions: dict = {}

    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 True
        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}}
        )

        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'])

    @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) -> ['Person']:
        ''' Get all active People. '''
        req = requests.get(urljoin(SERVER_URL, '/people'))

        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(
            name = data['name'],
            person_id = data['person_id'],
            consumptions = data['consumptions']
        )

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

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

    def create(self) -> 'Person':
        ''' 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 Person.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 ConsumptionType(
            name = data['name'],
            consumption_type_id = data['consumption_type_id'],
            icon = data.get('icon')
        )