import flask
import flask_bootstrap
import redis
import json
import os
import jinja2
import uuid
import string
import random


app = flask.Flask(__name__)
flask_bootstrap.Bootstrap(app)
db = redis.StrictRedis(host='redis', port=6379, db=0)


def render_flavor(flavor, template, data):
    return flask.render_template(
        os.path.join(flavor, template),
        **data
    )


def secret(length=16):
    charset = string.ascii_uppercase + string.digits
    return ''.join(
        random.SystemRandom().choice(charset)
        for _ in range(length)
    )


def build_app(setup_path):

    app.jinja_env.trim_blocks = True
    app.jinja_env.lstrip_blocks = True
    app.jinja_env.globals.update(dict(
        secret=secret
    ))

    versions = [
        path for path in os.listdir(setup_path)
        if os.path.isdir(os.path.join(setup_path, path))
    ]

    for version in versions:

        bp = flask.Blueprint(version, __name__)
        template_dir = os.path.join(setup_path, version, "templates")
        flavor_dir = os.path.join(setup_path, version, "flavors")
        bp.jinja_loader = jinja2.ChoiceLoader([
            jinja2.FileSystemLoader(template_dir),
            jinja2.FileSystemLoader(flavor_dir)
        ])

        @bp.route("/")
        def wizard():
            return flask.render_template('wizard.html')

        @bp.route("/submit", methods=["POST"])
        def submit():
            uid = str(uuid.uuid4())
            data = flask.request.form.copy()
            data.update(dict(uid=uid, version=version))
            db.set(uid, json.dumps(data))
            return flask.redirect(flask.url_for('.setup', uid=uid))

        @bp.route("/setup/<uid>", methods=["GET"])
        def setup(uid):
            data = json.loads(db.get(uid))
            flavor = data.get("flavor", "compose")
            rendered = render_flavor(flavor, "setup.html", data)
            return flask.render_template("setup.html", contents=rendered)

        @bp.route("/file/<uid>/<filepath>", methods=["GET"])
        def file(uid, filepath):
            data = json.loads(db.get(uid))
            flavor = data.get("flavor", "compose")
            return flask.Response(
                render_flavor(flavor, filepath, data),
                mimetype="application/text"
            )

        app.register_blueprint(bp, url_prefix="/{}".format(version))
        print("Serving version {}".format(version))


if __name__ == "__main__":
    build_app("/tmp/mailutest")
    app.run(debug=True)