#!/usr/bin/python3
"""Combined update script for various data sources."""

import asyncio
import json
import os
import smtplib
import sys
import typing
from datetime import date, datetime
from email.message import EmailMessage
from email.utils import formatdate, make_msgid
from time import time

import flask
import requests

import agenda.fx
import agenda.thespacedevs
import agenda.types
import agenda.uk_holiday
import agenda.waste_schedule
from agenda import gwr
from agenda.types import StrDict
from web_view import app


async def update_bank_holidays(config: flask.config.Config) -> None:
    """Update cached copy of UK Bank holidays."""
    t0 = time()
    events = await agenda.uk_holiday.get_holiday_list(config["DATA_DIR"])
    time_taken = time() - t0
    if not sys.stdin.isatty():
        return
    print(len(events), "bank holidays in list")
    print(f"took {time_taken:.1f} seconds")


async def update_bristol_bins(config: flask.config.Config) -> None:
    """Update waste schedule from Bristol City Council."""
    t0 = time()
    events = await agenda.waste_schedule.get_bristol_gov_uk(
        date.today(), config["DATA_DIR"], config["BRISTOL_UPRN"], refresh=True
    )
    time_taken = time() - t0
    if not sys.stdin.isatty():
        return
    for event in events:
        print(event)
    print(f"took {time_taken:.1f} seconds")


def send_mail(config: flask.config.Config, subject: str, body: str) -> None:
    """Send an e-mail."""
    msg = EmailMessage()

    msg["Subject"] = subject
    msg["To"] = f"{config['NAME']} <{config['MAIL_TO']}>"
    msg["From"] = f"{config['NAME']} <{config['MAIL_FROM']}>"
    msg["Date"] = formatdate()
    msg["Message-ID"] = make_msgid()

    # Add extra mail headers
    for header, value in config["MAIL_HEADERS"]:
        msg[header] = value

    msg.set_content(body)

    s = smtplib.SMTP(config["SMTP_HOST"])
    s.sendmail(config["MAIL_TO"], [config["MAIL_TO"]], msg.as_string())
    s.quit()


def update_gwr_advance_ticket_date(config: flask.config.Config) -> None:
    """Update GWR advance ticket date cache."""
    filename = os.path.join(config["DATA_DIR"], "advance-tickets.html")
    existing_html = open(filename).read()
    existing_date = gwr.extract_weekday_date(existing_html)

    new_html = requests.get(gwr.url).text
    open(filename, "w").write(new_html)

    new_date = gwr.extract_weekday_date(new_html)

    if existing_date == new_date:
        if sys.stdin.isatty():
            print("date has't changed:", existing_date)
        return

    subject = f"New GWR advance ticket booking date: {new_date}"
    body = f"""Old date: {existing_date}
New date: {new_date}

{gwr.url}

Agenda: https://edwardbetts.com/agenda/
"""
    send_mail(config, subject, body)


def report_space_launch_change(
    config: flask.config.Config, prev_launch: StrDict, cur_launch: StrDict
) -> None:
    """Send mail to announce change to space launch data."""
    subject = f'Change to {cur_launch["name"]}'

    body = f"""
A space launch of interest was updated.

Get ready for two big piles of JSON.

Old launch data
{json.dumps(prev_launch, indent=2)}

New launch data
{json.dumps(cur_launch, indent=2)}
    """

    send_mail(config, subject, body)


def get_launch_by_slug(data: StrDict, slug: str) -> StrDict:
    """Find last update for space launch."""
    return {item["slug"]: typing.cast(StrDict, item) for item in data["results"]}[slug]


def update_thespacedevs(config: flask.config.Config) -> None:
    """Update cache of space launch API."""
    rocket_dir = os.path.join(config["DATA_DIR"], "thespacedevs")

    existing_data = agenda.thespacedevs.load_cached_launches(rocket_dir)
    prev_launches = {
        slug: get_launch_by_slug(existing_data, slug)
        for slug in config["FOLLOW_LAUNCHES"]
    }

    t0 = time()
    data = agenda.thespacedevs.next_launch_api_data(rocket_dir)
    cur_launches = {
        slug: get_launch_by_slug(data, slug) for slug in config["FOLLOW_LAUNCHES"]
    }

    for slug in config["FOLLOW_LAUNCHES"]:
        prev, cur = prev_launches[slug], cur_launches[slug]
        if prev["last_updated"] != cur["last_updated"]:
            report_space_launch_change(config, prev, cur)

    time_taken = time() - t0
    if not sys.stdin.isatty():
        return
    rockets = [agenda.thespacedevs.summarize_launch(item) for item in data["results"]]
    print(len(rockets), "launches")
    print(f"took {time_taken:.1f} seconds")


def update_gandi(config: flask.config.Config) -> None:
    """Retrieve list of domains from gandi.net."""
    url = "https://api.gandi.net/v5/domain/domains"
    headers = {"authorization": "Bearer " + config["GANDI_TOKEN"]}
    filename = os.path.join(config["DATA_DIR"], "gandi_domains.json")

    r = requests.request("GET", url, headers=headers)
    items = r.json()
    assert isinstance(items, list)
    assert all(item["fqdn"] and item["dates"]["registry_ends_at"] for item in items)
    with open(filename, "w") as out:
        out.write(r.text)


def main() -> None:
    """Update caches."""
    now = datetime.now()
    hour = now.hour

    with app.app_context():
        if hour % 3 == 0:
            asyncio.run(update_bank_holidays(app.config))
            asyncio.run(update_bristol_bins(app.config))
            update_gwr_advance_ticket_date(app.config)
            update_gandi(app.config)

        if hour % 12 == 0:
            agenda.fx.get_rates(app.config)

        update_thespacedevs(app.config)


if __name__ == "__main__":
    main()