from typing import Optional, TypeAlias, TypedDict

from collections import defaultdict
from datetime import datetime, timedelta
from dataclasses import dataclass

from meta.sockets import Channel
from utils.lib import utc_now
from modules.profiles.profiles.profiles import ProfilesRegistry

from . import logger
from .data import SubathonData, Subathon, RunningSubathon, SubathonContribution, SubathonGoal
from .subathon import ActiveSubathon, SubathonRegistry


# ISO formatted timestamp
ISOTimestamp: TypeAlias = str


class GoalPayload(TypedDict):
    required: float
    name: str


class ContributionPayload(TypedDict):
    user_name: str
    user_id: str | None

    amount: float
    seconds_added: int
    timestamp: ISOTimestamp


class ScoreTablePayload(TypedDict):
    bit_score: float  # points per bit
    t1_score: float  # points per T1 sub
    t2_score: float  # points per T2 sub
    t3_score: float  # points per T3 sub

    score_time: float  # seconds added per point


class SubathonPayload(TypedDict):
    end_at: ISOTimestamp
    is_running: bool 
    score_table: ScoreTablePayload
    name: str

    total_contribution: float
    goals_met: int
    goals_total: int

    last_goal: GoalPayload | None
    next_goal: GoalPayload | None
    last_contribution: ContributionPayload | None


async def prepare_subathon(profiler: ProfilesRegistry, subathon: ActiveSubathon) -> SubathonPayload:
    now = utc_now()

    total_score = await subathon.get_score()
    goals = await subathon.get_goals()
    goals_met = 0
    last_goal = None
    next_goal = None
    total_goals = len(goals)
    for goal in goals:
        if goal.required_score >= total_score:
            last_goal = goal 
            goals_met += 1
        else:
            next_goal = goal 
            break

    contribs = await subathon.fetch_contributions().limit(1)
    last_contrib: ContributionPayload | None = None 
    if contribs:
        contrib = contribs[0]
        if contrib.profileid:
            profile = await profiler.get_profile(contrib.profileid)
            assert profile is not None
            name = profile.nickname
            user_id = None
        else:
            name = 'Anonymous'
            user_id = None
        last_contrib = ContributionPayload(
            user_name=name,
            user_id=user_id,
            amount=float(contrib.score),
            seconds_added=subathon.get_score_time(contrib.score),
            timestamp=contrib.created_at.isoformat()
        )

    score_table = ScoreTablePayload(
        bit_score=float(subathon.subathondata.bit_score),
        t1_score=float(subathon.subathondata.sub1_score),
        t2_score=float(subathon.subathondata.sub2_score),
        t3_score=float(subathon.subathondata.sub3_score),
        score_time=int(subathon.subathondata.score_time),
    )
    payload = SubathonPayload(
        name=subathon.subathondata.name,
        end_at=(await subathon.get_ending()).isoformat(),
        is_running=(subathon.running),
        score_table=score_table,
        total_contribution=float(await subathon.get_score()),
        goals_met=goals_met,
        goals_total=total_goals,
        last_goal=GoalPayload(
            required=float(last_goal.required_score),
            name=last_goal.description,
        ) if last_goal is not None else None,
        next_goal=GoalPayload(
            required=float(next_goal.required_score),
            name=next_goal.description,
        ) if next_goal is not None else None,
        last_contribution=last_contrib
    )
    return payload


class TimerChannel(Channel):
    name = 'SubTimer'

    def __init__(self, profiler: ProfilesRegistry, subathons: SubathonRegistry, **kwargs):
        super().__init__(**kwargs)

        self.profiler: ProfilesRegistry = profiler
        self.subathons: SubathonRegistry = subathons

        # Map of communities to webhooks listening for this community 
        self.communities = defaultdict(set)   # Map of communityid -> listening websockets

    async def on_connection(self, websocket, event):
        if not (cidstr := event.get('community')):
            raise ValueError("Subathon timer connection missing communityid")
        elif not cidstr.isdigit():
            raise ValueError("Community id provided is not an integer")
        cid = int(cidstr)
        community = await self.profiler.get_community(cid)
        if community is None:
            raise ValueError("Unknown community provided.")

        await super().on_connection(websocket, event)
        self.communities[cid].add(websocket)

        subathon = await self.subathons.get_active_subathon(cid)
        if subathon:
            payload = await prepare_subathon(self.profiler, subathon)
            await self.send_subathon_update(cid, payload, websocket)
        else:
            await self.send_no_subathon(cid, websocket)

    async def del_connection(self, websocket):
        for wss in self.communities.values():
            wss.discard(websocket)
        await super().del_connection(websocket)

    async def send_subathon_update(self, communityid: int, payload: SubathonPayload, websocket=None):
        for ws in (websocket,) if websocket else self.communities[communityid]:
            await self.send_event(
                {
                    'type': "DO",
                    'method': "setTimer",
                    'args': payload,
                },
                websocket=ws
            )

    async def send_subathon_ended(self, communityid: int, payload: SubathonPayload, websocket=None):
        for ws in (websocket,) if websocket else self.communities[communityid]:
            await self.send_event(
                {
                    'type': "DO",
                    'method': "endTimer",
                    'args': payload,
                },
                websocket=ws
            )

    async def send_no_subathon(self, communityid: int, websocket=None):
        for ws in (websocket,) if websocket else self.communities[communityid]:
            await self.send_event(
                {
                    'type': "DO",
                    'method': "noTimer",
                    'args': {},
                },
                websocket=ws
            )