from __future__ import annotations

import datetime
import json
import logging
from dataclasses import asdict, dataclass
from enum import Enum
from typing import Any, Dict, List, NewType, Optional, Tuple

import requests

from piket_server.models import Person
from piket_server.flask import db

# AARDBEI_ENDPOINT = "https://aardbei.app"
AARDBEI_ENDPOINT = "http://localhost:3000"

ActivityId = NewType("ActivityId", int)
PersonId = NewType("PersonId", int)
MemberId = NewType("MemberId", int)
ParticipantId = NewType("ParticipantId", int)


@dataclass(frozen=True)
class AardbeiPerson:
    aardbei_id: PersonId
    full_name: str

    @classmethod
    def from_aardbei_dict(cls, data: Dict[str, Any]) -> AardbeiPerson:
        d = data["person"]
        return cls(full_name=d["full_name"], aardbei_id=PersonId(d["id"]))


@dataclass(frozen=True)
class AardbeiMember:
    person: AardbeiPerson
    aardbei_id: MemberId
    is_leader: bool
    display_name: str

    @classmethod
    def from_aardbei_dict(cls, data: Dict[str, Any]) -> AardbeiMember:
        logging.debug("Init with data %s", json.dumps(data))
        d = data["member"]
        person = AardbeiPerson.from_aardbei_dict(d)
        return cls(
            person=person,
            aardbei_id=MemberId(d["id"]),
            is_leader=d["is_leader"],
            display_name=d["display_name"],
        )


@dataclass(frozen=True)
class AardbeiParticipant:
    person: AardbeiPerson
    member: Optional[AardbeiMember]
    aardbei_id: ParticipantId
    attending: bool
    is_organizer: bool
    notes: Optional[str]

    @property
    def name(self) -> str:
        if self.member is not None:
            return self.member.display_name

        return self.person.full_name

    @classmethod
    def from_aardbei_dict(cls, data: Dict[str, Any]) -> AardbeiParticipant:
        d = data["participant"]
        person = AardbeiPerson.from_aardbei_dict(d)

        member: Optional[AardbeiMember] = None
        if d["member"] is not None:
            member = AardbeiMember.from_aardbei_dict(d)

        aardbei_id = ParticipantId(d["id"])

        return cls(
            person=person,
            member=member,
            aardbei_id=aardbei_id,
            attending=d["attending"],
            is_organizer=d["is_organizer"],
            notes=d["notes"],
        )


class NoResponseAction(Enum):
    Present = "present"
    Absent = "absent"


@dataclass(frozen=True)
class ResponseCounts:
    present: int
    absent: int
    unknown: int

    @classmethod
    def from_aardbei_dict(cls, data: Dict[str, int]) -> ResponseCounts:
        return cls(
            present=data["present"], absent=data["absent"], unknown=data["unknown"]
        )


@dataclass(frozen=True)
class SparseAardbeiActivity:
    aardbei_id: ActivityId
    name: str
    description: str
    location: str
    start: datetime.datetime
    end: Optional[datetime.datetime]
    deadline: Optional[datetime.datetime]
    reminder_at: Optional[datetime.datetime]
    no_response_action: NoResponseAction
    response_counts: ResponseCounts

    def distance(self, reference: datetime.datetime) -> datetime.timedelta:
        """Calculate how long ago this Activity ended / how much time until it starts."""
        if self.end is not None:
            if reference > self.start and reference < self.end:
                return datetime.timedelta(seconds=0)

            elif reference < self.start:
                return self.start - reference

            elif reference > self.end:
                return reference - self.end

        if reference > self.start:
            return reference - self.start

        return self.start - reference

    @classmethod
    def from_aardbei_dict(cls, data: Dict[str, Any]) -> SparseAardbeiActivity:
        start: datetime.datetime = datetime.datetime.fromisoformat(
            data["activity"]["start"]
        )
        end: Optional[datetime.datetime] = None

        if data["activity"]["end"] is not None:
            end = datetime.datetime.fromisoformat(data["activity"]["end"])

        deadline: Optional[datetime.datetime] = None
        if data["activity"]["deadline"] is not None:
            deadline = datetime.datetime.fromisoformat(data["activity"]["deadline"])

        reminder_at: Optional[datetime.datetime] = None
        if data["activity"]["reminder_at"] is not None:
            reminder_at = datetime.datetime.fromisoformat(
                data["activity"]["reminder_at"]
            )

        no_response_action = NoResponseAction(data["activity"]["no_response_action"])

        response_counts = ResponseCounts.from_aardbei_dict(
            data["activity"]["response_counts"]
        )

        return cls(
            aardbei_id=ActivityId(data["activity"]["id"]),
            name=data["activity"]["name"],
            description=data["activity"]["description"],
            location=data["activity"]["location"],
            start=start,
            end=end,
            deadline=deadline,
            reminder_at=reminder_at,
            no_response_action=no_response_action,
            response_counts=response_counts,
        )


@dataclass(frozen=True)
class AardbeiActivity(SparseAardbeiActivity):
    participants: List[AardbeiParticipant]

    @classmethod
    def from_aardbei_dict(cls, data: Dict[str, Any]) -> AardbeiActivity:
        participants: List[AardbeiParticipant] = [
            AardbeiParticipant.from_aardbei_dict(x)
            for x in data["activity"]["participants"]
        ]

        sparse = super().from_aardbei_dict(data)

        return cls(participants=participants, **asdict(sparse))


@dataclass(frozen=True)
class AardbeiMatch:
    local: Person
    remote: AardbeiMember


@dataclass(frozen=True)
class AardbeiLink:
    matches: List[AardbeiMatch]
    """People that exist on both sides, but aren't linked in the people table."""
    altered_name: List[AardbeiMatch]
    """People that are already linked but changed one of their names."""
    remote_only: List[AardbeiMember]
    """People that only exist on the remote."""


def get_aardbei_people(token: str) -> List[AardbeiMember]:
    resp = requests.get(
        f"{AARDBEI_ENDPOINT}/api/groups/0/", headers={"Authorization": f"Group {token}"}
    )
    resp.raise_for_status()

    members = resp.json()["group"]["members"]

    return [AardbeiMember.from_aardbei_dict(x) for x in members]


def match_local_aardbei(aardbei_members: List[AardbeiMember]) -> AardbeiLink:
    matches: List[AardbeiMatch] = []
    altered_name: List[AardbeiMatch] = []
    remote_only: List[AardbeiMember] = []

    for member in aardbei_members:
        p: Optional[Person] = Person.query.filter_by(
            aardbei_id=member.aardbei_id
        ).one_or_none()

        if p is not None:
            if (
                p.full_name != member.person.full_name
                or p.display_name != member.display_name
            ):
                altered_name.append(AardbeiMatch(p, member))

            else:
                logging.info(
                    "OK: %s / %s (L%s/R%s)",
                    p.full_name,
                    p.display_name,
                    p.person_id,
                    p.aardbei_id,
                )

            continue

        p = Person.query.filter_by(full_name=member.person.full_name).one_or_none()

        if p is not None:
            matches.append(AardbeiMatch(p, member))
        else:
            remote_only.append(member)

    return AardbeiLink(matches, altered_name, remote_only)


def link_matches(matches: List[AardbeiMatch]) -> None:
    for match in matches:
        match.local.aardbei_id = match.remote.aardbei_id
        match.local.display_name = match.remote.display_name
        logging.info(
            "Linking local %s (%s) to remote %s (%s)",
            match.local.full_name,
            match.local.person_id,
            match.remote.display_name,
            match.remote.aardbei_id,
        )

        db.session.add(match.local)


def create_missing(missing: List[AardbeiMember]) -> None:
    for member in missing:
        pnew = Person(
            full_name=member.person.full_name,
            display_name=member.display_name,
            aardbei_id=member.aardbei_id,
            active=False,
        )
        logging.info(
            "Creating new person for %s / %s (%s)",
            member.person.full_name,
            member.display_name,
            member.aardbei_id,
        )
        db.session.add(pnew)


def update_names(matches: List[AardbeiMatch]) -> None:
    for match in matches:
        p = match.local
        member = match.remote
        aardbei_person = member.person

        changed = False

        if p.full_name != aardbei_person.full_name:
            logging.info(
                "Updating %s (L%s/R%s) full name %s to %s",
                aardbei_person.full_name,
                p.person_id,
                aardbei_person.aardbei_id,
                p.full_name,
                aardbei_person.full_name,
            )
            p.full_name = aardbei_person.full_name
            changed = True

        if p.display_name != member.display_name:
            logging.info(
                "Updating %s (L%s/R%s) display name %s to %s",
                p.full_name,
                p.person_id,
                aardbei_person.aardbei_id,
                p.display_name,
                member.display_name,
            )
            p.display_name = member.display_name
            changed = True

        assert changed, "got match but didn't update anything"

        db.session.add(p)


def get_activities(token: str) -> List[SparseAardbeiActivity]:
    result: List[SparseAardbeiActivity] = []

    for category in ("upcoming", "current", "previous"):
        resp = requests.get(
            f"{AARDBEI_ENDPOINT}/api/groups/0/{category}_activities",
            headers={"Authorization": f"Group {token}"},
        )

        resp.raise_for_status()

        for item in resp.json():
            result.append(SparseAardbeiActivity.from_aardbei_dict(item))

    return result


if __name__ == "__main__":
    logging.basicConfig(level=logging.DEBUG)

    token = input("Token: ")
    aardbei_people = get_aardbei_people(token)
    activities = get_activities(token)
    link = match_local_aardbei(aardbei_people)
    link_matches(link.matches)
    create_missing(link.remote_only)
    update_names(link.altered_name)

    confirm = input("Commit? Y/N")
    if confirm.lower() == "y":
        print("Committing.")
        db.session.commit()
    else:
        print("Not committing.")