import requests
import dataclasses
import datetime
from typing import Any
import functools
from collections.abc import Iterator
from logging import getLogger

logger = getLogger(__name__)

# Types

@dataclasses.dataclass(frozen=True)
class SeqId:
    raw_id: int

@dataclasses.dataclass(frozen=True)
class CardId:
    raw_id: str

@dataclasses.dataclass(frozen=True)
class CommonId:
    raw_id: str

@dataclasses.dataclass(frozen=True)
class UserId:
    raw_id: str

@dataclasses.dataclass(frozen=True)
class OrganizationId:
    raw_id: str

@dataclasses.dataclass(frozen=True)
class Card:
    card_id: CardId
    seq_id: SeqId
    common_id: CommonId
    organization_id: OrganizationId
    is_archived: bool
    name: str
    dependencies: list[None] # TODO
    tags: list[None] # TODO
    todo_list_user_id: UserId | None
    todo_list_completed: bool | None
    creator_user_id: UserId
    creation_date: datetime.datetime

    detailed_description: str | None

    ''' TODO, fieds:
     'position': -399
     'listPosition': -399

     'isLane': False
     'assignments': [{'userId': 'Faieomp8fuS8DrnyP' 'completed': True}]
     'tasksTotal': 0
     'tasksDone': 0
     'attachments': []
     'customFields':
     'timeOnBoard': None
     'timeOnColumns': None
     'favroAttachments': []
    '''

    @staticmethod
    def from_json(json: dict[str, Any]) -> 'Card':
        return Card(
                card_id = CardId(json['cardId']),
                seq_id = SeqId(json['sequentialId']),
                common_id = CommonId(json['cardCommonId']),
                detailed_description = json.get('detailedDescription'),
                is_archived = json['archived'],
                organization_id = OrganizationId(json['organizationId']),
                name = json['name'],
                todo_list_user_id = UserId(json['todoListUserId' ]) if 'todoListUserId' in json else None,
                todo_list_completed = json.get('todoListCompleted'),
                dependencies = json['dependencies'],
                tags = json['tags'],
                creator_user_id = UserId(json['createdByUserId']),
                creation_date = datetime.datetime.fromisoformat(json['createdAt']),
        )

# Endpoints
URL_API_ROOT = 'https://favro.com/api/v1'
URL_GET_ALL_CARDS = URL_API_ROOT+'/cards'
URL_UPDATE_CARD = URL_API_ROOT+'/cards/{card_id}'

class FavroClient:

    def __init__(self, *, favro_org_id: OrganizationId, favro_username: str, favro_password: str,
                 session: requests.Session | None = None, read_only=True):

        assert favro_org_id is not None
        assert favro_username is not None
        assert favro_password is not None

        # Setup session
        self.session = session or requests.Session()
        self.session.auth = (favro_username, favro_password)
        self.session.headers.update({
                'organizationId': favro_org_id.raw_id,
                'content-type': 'application/json',
        })
        self.read_only = read_only

        self.card_id_to_seq_id: dict[CardId, SeqId] = {}
        self.seq_id_to_card_id: dict[SeqId, CardId] = {}

    def check_logged_in(self) -> None:
        next(self.get_todo_list_cards())

    def get_todo_list_cards(self) -> Iterator[Card]:
        yield from self.get_cards(todo_list=True)


    def get_cards(self, *, seq_id: SeqId | None = None, todo_list=False) -> Iterator[Card]:
        # Determine params for get_cards
        request = self._get_cards_request(seq_id, todo_list)

        # Run query
        response = self.session.send(request)
        response.raise_for_status()
        json = response.json()

        # TODO: Pageination
        for entity_json in json['entities']:
            card = Card.from_json(entity_json)
            self.card_id_to_seq_id[card.card_id] = card.seq_id
            self.seq_id_to_card_id[card.seq_id] = card.card_id
            yield card
            del entity_json

    def _get_cards_request(self, seq_id: SeqId | None = None, todo_list=False) -> requests.PreparedRequest:
        params = {'descriptionFormat': 'markdown'}
        if seq_id is not None:
            params['cardSequentialId']= str(seq_id.raw_id)
        if todo_list is True:
            params['todoList'] = 'true'

        request = requests.Request('GET', URL_GET_ALL_CARDS, params = params)
        return self.session.prepare_request(request)

    def get_card(self, seq_id: SeqId) -> Card:
        return next(self.get_cards(seq_id=seq_id))

    def get_card_id(self, seq_id: SeqId) -> CardId:
        if card_id := self.seq_id_to_card_id[seq_id]:
            return card_id
        first_card = next(self.get_cards(seq_id = seq_id))
        return first_card.card_id

    def _invalidate_cache(self, card_id: CardId) -> None:
        self.session.cache.delete(requests=[
            self._get_cards_request(seq_id=self.card_id_to_seq_id[card_id])
        ])


    def update_card_description(self, card_id: CardId, description: str) -> Card:
        """Returns updated Card."""
        if self.read_only == 'silent':
            logger.warning('FavroClient is silent read only: Discarding card description update of length %d',
                        len(description))
            return None # TODO
        elif self.read_only is True:
            raise Exception('FavroClient is read only')

        json_body = {
                'detailedDescription': description,
                'descriptionFormat': 'markdown',
        }

        logger.warning('Sending body: %s', json_body)
        response = self.session.put(URL_UPDATE_CARD.format(card_id=card_id.raw_id), json=json_body)
        response.raise_for_status()
        logger.warning("Response: %s", response.json())
        self._invalidate_cache(card_id)

        return Card.from_json(response.json())