import base64
import json
import os.path
import secrets
import subprocess
from typing import Any

from flask import Flask, Response, g, redirect, request, url_for
from flask.cli import AppGroup
from flask_babel import Babel
from flask_qrcode import QRcode

qrcode = QRcode()
babel = Babel()
babel_cli = AppGroup("babel")


def create_app() -> Flask:

    app = Flask(__name__)

    config_file = (
        os.path.abspath("config.json")
        if app.debug
        else os.path.abspath("/etc/membership.json")
    )

    try:
        app.config.from_file(config_file, load=json.load)
    except FileNotFoundError:
        pass

    qrcode.init_app(app)
    babel.init_app(app)

    _default_secret_key = base64.b64encode(secrets.token_bytes()).decode("utf-8")
    app.config["SECRET_KEY"] = os.environ.get("SECRET_KEY", _default_secret_key)
    app.config["LANGUAGES"] = ["en", "de", "fr", "lb"]

    app.config.setdefault("SUPPORTING_FEE", 40)
    app.config.setdefault("REGULAR_FEE", 120)

    app.config.setdefault("DIGICASH_ENABLED", True)
    app.config.setdefault("SATISPAY_ENABLED", True)
    app.config.setdefault("CRYPTOCURRENCIES", dict())

    @babel.localeselector
    def get_locale() -> Any:
        if not g.get("lang_code", None):
            g.lang_code = request.accept_languages.best_match(app.config["LANGUAGES"])
        return g.lang_code

    from .views import root_page

    app.register_blueprint(root_page)

    @app.route("/")
    def home() -> Response:
        g.lang_code = request.accept_languages.best_match(app.config["LANGUAGES"])
        return redirect(url_for("root.index"))

    app.cli.add_command(babel_cli)

    return app


@babel_cli.command("extract")
def babel_extract() -> None:
    subprocess.run(
        [
            "pybabel",
            "extract",
            "-F",
            "babel.cfg",
            "-k",
            "lazy_gettext",
            "-o",
            "messages.pot",
            ".",
        ]
    )


@babel_cli.command("update")
def babel_update() -> None:
    subprocess.run(
        ["pybabel", "update", "-i", "messages.pot", "-d", "c3l_membership/translations"]
    )


@babel_cli.command("compile")
def babel_compile() -> None:
    subprocess.run(["pybabel", "compile", "-d", "c3l_membership/translations"])


app = create_app()