#!/usr/bin/python3

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

import inspect
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.travel

app = flask.Flask(__name__)
app.debug = False


@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)

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


@app.route("/travel")
def travel_list() -> str:
    """Page showing a list of upcoming travel."""
    config = agenda.data.get_config()
    data_dir = config["data"]["personal-data"]
    flights = agenda.travel.parse_yaml("flights", data_dir)
    trains = agenda.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."""
    config = agenda.data.get_config()
    data_dir = config["data"]["personal-data"]
    filepath = os.path.join(data_dir, "conferences.yaml")
    item_list = yaml.safe_load(open(filepath))["conferences"]

    item_list.sort(key=lambda conf: as_date(conf["start"]))

    return flask.render_template("conference_list.html", item_list=item_list)


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