"""Agenda data."""

import asyncio
import os
import typing
from datetime import date, datetime, timedelta
from time import time

import dateutil.rrule
import dateutil.tz
import flask
import lxml
import pytz

from . import (
    accommodation,
    birthday,
    bristol_waste,
    busy,
    carnival,
    conference,
    domains,
    economist,
    events_yaml,
    gandi,
    gwr,
    hn,
    holidays,
    meetup,
    n_somerset_waste,
    stock_market,
    subscription,
    sun,
    thespacedevs,
    travel,
    uk_holiday,
)
from .event import Event
from .types import StrDict
from .utils import time_function

here = dateutil.tz.tzlocal()

# deadline to file tax return
# credit card expiry dates
# morzine ski lifts
# chalet availability calendar

# starlink visible


def timezone_transition(
    start: datetime, end: datetime, key: str, tz_name: str
) -> list[Event]:
    """Clocks changes."""
    tz = pytz.timezone(tz_name)
    return [
        Event(name=key, date=pytz.utc.localize(t).astimezone(tz))
        for t in tz._utc_transition_times  # type: ignore
        if start <= t <= end
    ]


async def n_somerset_waste_collection_events(
    data_dir: str, postcode: str, uprn: str, force_cache: bool = False
) -> list[Event]:
    """Waste colllection events."""
    html = await n_somerset_waste.get_html(data_dir, postcode, uprn, force_cache)
    root = lxml.html.fromstring(html)
    events = n_somerset_waste.parse(root)
    return events


async def bristol_waste_collection_events(
    data_dir: str, start_date: date, uprn: str, force_cache: bool = False
) -> list[Event]:
    """Waste colllection events."""
    cache = "force" if force_cache else "recent"
    return await bristol_waste.get(start_date, data_dir, uprn, cache)


def find_events_during_stay(
    accommodation_events: list[Event], markets: list[Event]
) -> list[Event]:
    """Market events that happen during accommodation stays."""
    overlapping_markets = []
    for market in markets:
        market_date = market.as_date
        assert isinstance(market_date, date)
        for e in accommodation_events:
            start, end = e.as_date, e.end_as_date
            assert start and end and all(isinstance(i, date) for i in (start, end))
            # Check if the market date is within the accommodation dates.
            if start <= market_date <= end:
                overlapping_markets.append(market)
                break  # Breaks the inner loop if overlap is found.
    return overlapping_markets


def hide_markets_while_away(
    events: list[Event], accommodation_events: list[Event]
) -> None:
    """Hide markets that happen while away."""
    optional = [
        e
        for e in events
        if e.name == "market" or (e.title and "LHG Run Club" in e.title)
    ]
    going = [e for e in events if e.going]

    overlapping_markets = find_events_during_stay(
        accommodation_events + going, optional
    )
    for market in overlapping_markets:
        events.remove(market)


class AgendaData(typing.TypedDict, total=False):
    """Agenda Data."""

    now: datetime
    stock_markets: list[str]
    rockets: list[thespacedevs.Summary]
    gwr_advance_tickets: date | None
    data_gather_seconds: float
    stock_market_times_seconds: float
    timings: list[tuple[str, float]]
    events: list[Event]
    accommodation_events: list[Event]
    gaps: list[StrDict]
    sunrise: datetime
    sunset: datetime
    last_week: date
    two_weeks_ago: date
    errors: list[tuple[str, Exception]]


def rocket_launch_events(rockets: list[thespacedevs.Summary]) -> list[Event]:
    """Rocket launch events."""
    events: list[Event] = []
    for launch in rockets:
        dt = None

        net_precision = launch["net_precision"]
        skip = {"Year", "Month", "Quarter", "Fiscal Year"}
        if net_precision == "Day":
            dt = datetime.strptime(launch["net"], "%Y-%m-%dT%H:%M:%SZ").date()
        elif (
            net_precision
            and net_precision not in skip
            and "Year" not in net_precision
            and launch["t0_time"]
        ):
            dt = pytz.utc.localize(
                datetime.strptime(launch["net"], "%Y-%m-%dT%H:%M:%SZ")
            )

        if not dt:
            continue

        rocket_name = (
            f'{launch["rocket"]["full_name"]}: '
            + f'{launch["mission_name"] or "[no mission]"}'
        )
        e = Event(name="rocket", date=dt, title=rocket_name)
        events.append(e)

    return events


async def get_data(now: datetime, config: flask.config.Config) -> AgendaData:
    """Get data to display on agenda dashboard."""
    data_dir = config["DATA_DIR"]

    rocket_dir = os.path.join(data_dir, "thespacedevs")
    today = now.date()
    two_weeks_ago = today - timedelta(weeks=2)
    last_week = today - timedelta(weeks=1)
    last_year = today - timedelta(days=365)
    next_year = today + timedelta(days=2 * 365)

    minus_365 = now - timedelta(days=365)
    plus_365 = now + timedelta(days=365)

    t0 = time()
    offline_mode = bool(config.get("OFFLINE_MODE"))
    result_list = await asyncio.gather(
        time_function(
            "gwr_advance_tickets", gwr.advance_ticket_date, data_dir, offline_mode
        ),
        time_function(
            "backwell_bins",
            n_somerset_waste_collection_events,
            data_dir,
            config["BACKWELL_POSTCODE"],
            config["BACKWELL_UPRN"],
            offline_mode,
        ),
        time_function(
            "bristol_bins",
            bristol_waste_collection_events,
            data_dir,
            today,
            config["BRISTOL_UPRN"],
            offline_mode,
        ),
    )
    rockets = thespacedevs.read_cached_launches(rocket_dir)

    results = {call[0]: call[1] for call in result_list}

    errors = [(call[0], call[3]) for call in result_list if call[3]]

    gwr_advance_tickets = results["gwr_advance_tickets"]

    data_gather_seconds = time() - t0
    t0 = time()

    stock_market_times = stock_market.open_and_close()
    stock_market_times_seconds = time() - t0

    reply: AgendaData = {
        "now": now,
        "stock_markets": stock_market_times,
        "rockets": rockets,
        "gwr_advance_tickets": gwr_advance_tickets,
        "data_gather_seconds": data_gather_seconds,
        "stock_market_times_seconds": stock_market_times_seconds,
        "timings": [(call[0], call[2]) for call in result_list],
    }

    my_data = config["PERSONAL_DATA"]
    events = (
        [
            Event(name="mothers_day", date=uk_holiday.get_mothers_day(today)),
        ]
        + timezone_transition(minus_365, plus_365, "uk_clock_change", "Europe/London")
        + timezone_transition(
            minus_365, plus_365, "us_clock_change", "America/New_York"
        )
    )

    if gwr_advance_tickets:
        events.append(Event(name="gwr_advance_tickets", date=gwr_advance_tickets))

    us_hols = holidays.us_holidays(last_year, next_year)
    events += holidays.get_nyse_holidays(last_year, next_year, us_hols)

    accommodation_events = accommodation.get_events(
        os.path.join(my_data, "accommodation.yaml")
    )

    holiday_list = holidays.get_all(last_year, next_year, data_dir)
    events += holidays.combine_holidays(holiday_list)
    if flask.g.user.is_authenticated:
        events += birthday.get_birthdays(
            last_year, os.path.join(my_data, "entities.yaml")
        )
        events += domains.renewal_dates(my_data)
    events += accommodation_events
    events += travel.all_events(my_data)
    events += conference.get_list(os.path.join(my_data, "conferences.yaml"))
    for key in "backwell_bins", "bristol_bins":
        if results[key]:
            events += results[key]
    events += events_yaml.read(my_data, last_year, next_year)
    events += subscription.get_events(os.path.join(my_data, "subscriptions.yaml"))
    events += gandi.get_events(data_dir)
    events += economist.publication_dates(last_week, next_year)
    events += meetup.get_events(my_data)
    events += hn.whoishiring(last_year, next_year)
    events += carnival.rio_carnival_events(last_year, next_year)
    events += rocket_launch_events(rockets)
    events += [Event(name="today", date=today)]

    busy_events = [
        e
        for e in sorted(events, key=lambda e: e.as_date)
        if e.as_date > today and e.as_date < next_year and busy.busy_event(e)
    ]

    gaps = busy.find_gaps(busy_events)

    events += [
        Event(name="gap", date=gap["start"], end_date=gap["end"]) for gap in gaps
    ]

    # Sort events by their datetime; the "today" event is prioritised
    # at the top of the list for today. This is achieved by sorting first by
    # the datetime attribute, and then ensuring that events with the name
    # "today" are ordered before others on the same date.
    events.sort(key=lambda e: (e.as_datetime, e.name != "today"))

    reply["gaps"] = gaps

    observer = sun.bristol()
    reply["sunrise"] = sun.sunrise(observer)
    reply["sunset"] = sun.sunset(observer)
    reply["events"] = events
    reply["accommodation_events"] = accommodation_events
    reply["last_week"] = last_week
    reply["two_weeks_ago"] = two_weeks_ago

    reply["errors"] = errors

    return reply