#!/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

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

import agenda.data
import agenda.error_mail
import agenda.thespacedevs
from agenda import format_list_with_ampersand, travel
from agenda.types import StrDict, Trip

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

    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"
    )

    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,
    )


def load_travel(travel_type: str) -> list[StrDict]:
    """Read flight and train journeys."""
    data_dir = app.config["PERSONAL_DATA"]
    items = travel.parse_yaml(travel_type + "s", data_dir)
    for item in items:
        item["type"] = travel_type
    return items


def build_trip_list() -> list[Trip]:
    """Generate list of trips."""
    trips: dict[date, Trip] = {}

    data_dir = app.config["PERSONAL_DATA"]

    travel_items = sorted(
        load_travel("flight") + load_travel("train"), key=operator.itemgetter("depart")
    )

    data = {
        "travel": travel_items,
        "accommodation": travel.parse_yaml("accommodation", data_dir),
        "conferences": travel.parse_yaml("conferences", data_dir),
    }

    for key, item_list in data.items():
        assert isinstance(item_list, list)
        for item in item_list:
            if not (start := item.get("trip")):
                continue
            if start not in trips:
                trips[start] = Trip(start=start)
            getattr(trips[start], key).append(item)

    return [trip for _, trip in sorted(trips.items())]


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

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


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