#!/usr/bin/python3

"""Web page to show upcoming events."""

import inspect
import operator
import os.path
import sys
import traceback
from datetime import date, datetime, timedelta

import flask
import werkzeug
import werkzeug.debug.tbtools
import yaml

import agenda.data
import agenda.error_mail
import agenda.holidays
import agenda.thespacedevs
import agenda.trip
from agenda import format_list_with_ampersand, travel

app = flask.Flask(__name__)
app.debug = False
app.config.from_object("config.default")

agenda.error_mail.setup_error_mail(app)


@app.errorhandler(werkzeug.exceptions.InternalServerError)
def exception_handler(e: werkzeug.exceptions.InternalServerError) -> tuple[str, int]:
    """Handle exception."""
    exec_type, exc_value, current_traceback = sys.exc_info()
    assert exc_value
    tb = werkzeug.debug.tbtools.DebugTraceback(exc_value)

    summary = tb.render_traceback_html(include_title=False)
    exc_lines = "".join(tb._te.format_exception_only())

    last_frame = list(traceback.walk_tb(current_traceback))[-1][0]
    last_frame_args = inspect.getargs(last_frame.f_code)

    return (
        flask.render_template(
            "show_error.html",
            plaintext=tb.render_traceback_text(),
            exception=exc_lines,
            exception_type=tb._te.exc_type.__name__,
            summary=summary,
            last_frame=last_frame,
            last_frame_args=last_frame_args,
        ),
        500,
    )


@app.route("/")
async def index() -> str:
    """Index page."""
    now = datetime.now()
    data = await agenda.data.get_data(now, app.config)

    return flask.render_template("index.html", today=now.date(), **data)


@app.route("/launches")
async def launch_list() -> str:
    """Web page showing List of space launches."""
    now = datetime.now()
    data_dir = app.config["DATA_DIR"]
    rocket_dir = os.path.join(data_dir, "thespacedevs")
    rockets = await agenda.thespacedevs.get_launches(rocket_dir, limit=100)

    return flask.render_template("launches.html", rockets=rockets, now=now)


@app.route("/gaps")
async def gaps_page() -> str:
    """List of available gaps."""
    now = datetime.now()
    data = await agenda.data.get_data(now, app.config)
    return flask.render_template("gaps.html", today=now.date(), gaps=data["gaps"])


@app.route("/travel")
def travel_list() -> str:
    """Page showing a list of upcoming travel."""
    data_dir = app.config["PERSONAL_DATA"]
    flights = travel.parse_yaml("flights", data_dir)
    trains = travel.parse_yaml("trains", data_dir)

    return flask.render_template("travel.html", flights=flights, trains=trains)


def as_date(d: date | datetime) -> date:
    """Date of event."""
    return d.date() if isinstance(d, datetime) else d


@app.route("/conference")
def conference_list() -> str:
    """Page showing a list of conferences."""
    data_dir = app.config["PERSONAL_DATA"]
    filepath = os.path.join(data_dir, "conferences.yaml")
    item_list = yaml.safe_load(open(filepath))
    today = date.today()

    conference_trip_lookup = {}
    for trip in agenda.trip.build_trip_list():
        for trip_conf in trip.conferences:
            key = (trip_conf["start"], trip_conf["name"])
            conference_trip_lookup[key] = trip

    for conf in item_list:
        conf["start_date"] = as_date(conf["start"])
        conf["end_date"] = as_date(conf["end"])

        key = (conf["start"], conf["name"])
        if this_trip := conference_trip_lookup.get(key):
            conf["linked_trip"] = this_trip

    item_list.sort(key=operator.itemgetter("start_date"))

    current = [
        conf
        for conf in item_list
        if conf["start_date"] <= today and conf["end_date"] >= today
    ]

    past = [conf for conf in item_list if conf["end_date"] < today]
    future = [conf for conf in item_list if conf["start_date"] > today]

    return flask.render_template(
        "conference_list.html",
        current=current,
        past=past,
        future=future,
        today=today,
        get_country=agenda.get_country,
    )


@app.route("/accommodation")
def accommodation_list() -> str:
    """Page showing a list of past, present and future accommodation."""
    data_dir = app.config["PERSONAL_DATA"]
    items = travel.parse_yaml("accommodation", data_dir)

    stays_in_2024 = [item for item in items if item["from"].year == 2024]
    total_nights_2024 = sum(
        (stay["to"].date() - stay["from"].date()).days for stay in stays_in_2024
    )

    nights_abroad_2024 = sum(
        (stay["to"].date() - stay["from"].date()).days
        for stay in stays_in_2024
        if stay["country"] != "gb"
    )

    trip_lookup = {}

    for trip in agenda.trip.build_trip_list():
        for trip_stay in trip.accommodation:
            key = (trip_stay["from"], trip_stay["name"])
            trip_lookup[key] = trip

    for item in items:
        key = (item["from"], item["name"])
        if this_trip := trip_lookup.get(key):
            item["linked_trip"] = this_trip

    return flask.render_template(
        "accommodation.html",
        items=items,
        total_nights_2024=total_nights_2024,
        nights_abroad_2024=nights_abroad_2024,
        get_country=agenda.get_country,
    )


@app.route("/trip")
def trip_list() -> str:
    """Page showing a list of trips."""
    trip_list = agenda.trip.build_trip_list()

    today = date.today()
    current = [
        item
        for item in trip_list
        if item.start <= today and (item.end or item.start) >= today
    ]

    past = [item for item in trip_list if (item.end or item.start) < today]
    future = [item for item in trip_list if item.start > today]

    future_coordinates, future_routes = agenda.trip.get_coordinates_and_routes(future)
    past_coordinates, past_routes = agenda.trip.get_coordinates_and_routes(past)

    return flask.render_template(
        "trip_list.html",
        current=current,
        past=past,
        future=future,
        future_coordinates=future_coordinates,
        future_routes=future_routes,
        past_coordinates=past_coordinates,
        past_routes=past_routes,
        today=today,
        get_country=agenda.get_country,
        format_list_with_ampersand=format_list_with_ampersand,
    )


@app.route("/trip/<start>")
def trip_page(start: str) -> str:
    """Individual trip page."""
    trip_iter = iter(agenda.trip.build_trip_list())
    today = date.today()

    prev_trip = None
    for trip in trip_iter:
        if trip.start.isoformat() == start:
            break
        prev_trip = trip
    next_trip = next(trip_iter, None)

    if not trip:
        flask.abort(404)

    coordinates = agenda.trip.collect_trip_coordinates(trip)
    routes = agenda.trip.get_trip_routes(trip)
    for route in routes:
        if "geojson_filename" in route:
            route["geojson"] = agenda.trip.read_geojson(route.pop("geojson_filename"))

    return flask.render_template(
        "trip_page.html",
        trip=trip,
        prev_trip=prev_trip,
        next_trip=next_trip,
        today=today,
        coordinates=coordinates,
        routes=routes,
        get_country=agenda.get_country,
        format_list_with_ampersand=format_list_with_ampersand,
    )


@app.route("/holidays")
def holiday_list() -> str:
    """List of holidays."""
    today = date.today()
    data_dir = app.config["DATA_DIR"]
    next_year = today + timedelta(days=1 * 365)
    items = agenda.holidays.get_all(today - timedelta(days=2), next_year, data_dir)

    items.sort(key=lambda item: (item.date, item.country))

    return flask.render_template(
        "holiday_list.html", items=items, get_country=agenda.get_country
    )


if __name__ == "__main__":
    app.run(host="0.0.0.0")