#!/usr/bin/env python3
# vim:tabstop=4 softtabstop=4 shiftwidth=4 textwidth=160 smarttab expandtab colorcolumn=160
#
# Copyright (C) 2021 Daniel Friesel
#
# SPDX-License-Identifier: BSD-2-Clause

import argparse

import aiohttp
from aiohttp import web
from datetime import datetime
import dateutil.parser

from jinja2 import Environment, FileSystemLoader, select_autoescape

import json
import os

headers = {
    "Access-Control-Allow-Origin": "*",
    "Content-Type": "text/html; charset=utf-8",
}

db_rest_api = os.getenv("NVM_DB_REST_API", "https://v5.db.transport.rest")

env = Environment(loader=FileSystemLoader("templates"), autoescape=select_autoescape())


class Departure:
    def __init__(self, obj):
        self.__dict__.update(obj)

        if not "cancelled" in obj:
            self.cancelled = False

        self.classes = str()

        if "," in self.direction:
            self.direction, self.suffix = self.direction.split(",", maxsplit=1)
        else:
            self.suffix = None

        if "line" in obj:
            self.line = Line(self.line)
        try:
            self.when = dateutil.parser.parse(self.when)
        except TypeError:
            self.when = None
        try:
            self.plannedWhen = dateutil.parser.parse(self.plannedWhen)
        except TypeError:
            self.plannedWhen = None

        if self.cancelled:
            self.classes += " cancelled"

        if self.when:
            self.sort_by = self.when.timestamp()
        elif self.plannedWhen:
            self.sort_by = self.plannedWhen.timestamp()
        else:
            self.sort_by = 0

        if self.delay:
            self.delay = self.delay // 60
            self.delay = f"{self.delay:+.0f}"

    def set_relative(self, now):
        minutes = (self.sort_by - now) // 60
        if minutes < 1:
            self.relativeWhen = "sofort"
        elif minutes < 60:
            self.relativeWhen = f"{minutes:.0f} min"
        else:
            self.relativeWhen = f"{minutes//60:.0f}h {minutes%60:.0f}min"


class Line:
    def __init__(self, obj):
        self.__dict__.update(obj)
        self.css_class = str()

        if self.product == "tram":
            self.name = self.name.removeprefix("STR ")
            self.css_class = "tram"
        elif self.product == "suburban":
            self.css_class = "suburban"
        elif self.product == "subway":
            self.css_class = "subway"
        elif self.product == "bus":
            self.name = self.name.removeprefix("Bus ")
            self.css_class = "bus"


async def show_departure_board(request):
    try:
        eva = int(request.match_info.get("eva"))
    except ValueError:
        return web.HTTPBadRequest(text="EVA must be a number at the moment")

    async with aiohttp.ClientSession() as session:
        async with session.get(
            f"{db_rest_api}/stops/{eva}/departures?results=60&duration=120&stopovers=true"
        ) as response:
            departures = await response.text()
            departures = json.loads(departures)

    if type(departures) is dict and departures.get("error", False):
        return web.HTTPNotFound(body=json.dumps(departures), headers=headers)

    departures = list(map(Departure, departures))

    now = datetime.now().timestamp()
    for departure in departures:
        departure.set_relative(now)

    departure_board = env.get_template("departure_list.html")
    return web.Response(
        body=departure_board.render(title="Noot", departures=departures),
        headers=headers,
    )


if __name__ == "__main__":

    parser = argparse.ArgumentParser(description="eva to efa gateway")
    parser.add_argument("--port", type=int, metavar="PORT", default=8080)
    parser.add_argument("--prefix", type=str, metavar="PATH", default="/")
    args = parser.parse_args()

    app = web.Application()
    app.router.add_get(f"{args.prefix}board/{{eva}}", show_departure_board)
    app.router.add_static(f"{args.prefix}static", "static")
    web.run_app(app, host="localhost", port=args.port)