"""Less flashy version. More hard-coding."""

from json import dumps, loads
from os import environ
from os.path import exists
from pathlib import Path
from random import choice
from shlex import split
from string import ascii_lowercase
from subprocess import run
from typing import Dict

from flask import Flask, render_template, request
from flask_wtf import FlaskForm
from ruamel.yaml import YAML
from wtforms import PasswordField, StringField
from wtforms.validators import DataRequired

app = Flask(__name__)
app.secret_key = b'_5#y2L"F4Q8z\n\xec]/'

yaml = YAML()

APPS = {"gitea": "https://git.autonomic.zone/compose-stacks/gitea"}
DATA_DIR = Path("./data")


def get_secret(n: int) -> str:
    """Generate a ASCII secret that is n chars long."""
    return "".join(choice(ascii_lowercase) for _ in range(n))


def clone_app_template(app_name: str) -> None:
    """Git clone an app template repository."""
    clone_path = DATA_DIR / app_name
    clone_url = APPS[app_name]
    run(split(f"git clone {clone_url} {clone_path}"))


def dump_db(db: Dict) -> None:
    """Dump the database."""
    with open(DATA_DIR / "db.json", "w") as handle:
        handle.write(dumps(db))


def load_db() -> Dict:
    """Load the database."""
    db_path = DATA_DIR / "db.json"
    if exists(db_path):
        with open(db_path, "r") as handle:
            return loads(handle.read())
    return {}


def stack_deploy(app_name, env):
    """Depoy an application to the swarm."""
    compose_yml = DATA_DIR / app_name / "compose.yml"
    command = f"docker stack deploy -c {compose_yml} {app_name}"
    run(split(command), env=env)


def get_loaded_env(app_name, request_form):
    """Load an environment with install form values for compose.yml injection."""
    environment = environ.copy()
    for key in request_form.keys():
        environment[key.upper()] = request.form[key]
    return environment


class GiteaInstallForm(FlaskForm):
    """Gitea installation form."""

    app_name = StringField("Application name", default="Git with a cup of tea")
    domain = StringField("Domain name", validators=[DataRequired()])

    db_host = StringField("Database host", default="mariadb:3306")
    db_name = StringField("Database name", default="gitea")
    db_passwd = PasswordField("DB password", default=get_secret(n=32))
    db_root_passwd = PasswordField("Root DB password", default=get_secret(n=32))
    db_type = StringField("Database type", default="mysql")
    db_user = StringField("Database user", default="mysql")
    internal_token = PasswordField("Internal token", default=get_secret(n=105))
    jwt_secret = PasswordField("JWT secret", default=get_secret(n=43))
    secret_key = PasswordField("Secret key", default=get_secret(n=64))
    ssh_port = StringField("SSH port", default="2222")


@app.route("/")
def index():
    """Home page for app installation possibilities."""
    return render_template("second/index.html", apps=[app for app in APPS])


@app.route("/install/<app_name>")
def install(app_name):
    """Installation page for an app."""
    if app_name == "gitea":
        form = GiteaInstallForm()
    return render_template("second/install.html", app_name=app_name, form=form)


@app.route("/deploy/<app_name>", methods=["POST"])
def deploy(app_name):
    """Deployment end-point for an app."""
    if app_name == "gitea":
        form = GiteaInstallForm(request.form)

    if not form.validate():
        return render_template("install.html", app_name=app_name, form=form)

    environment = get_loaded_env(app_name, request.form)

    # Note(decentral1se): how to handle the following?
    # configs -> ${STACK_NAME}_app_ini_${APP_INI_VERSION}
    # secrets -> ${STACK_NAME}_db_passwd_${DB_PASSWD_VERSION}
    # and dump it all to the db.json when we're done here too

    stack_deploy(app_name, environment)


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