from flask import Flask, render_template, request
import sqlite3
import os
import string


app = Flask(__name__)


def get_db_connection():
    db_path = os.environ.get('HBC_DB_PATH')
    if not db_path:
        raise Exception("DB Path not defined")

    return sqlite3.connect(db_path + '/hbc.db')


def db_setup():
    conn = get_db_connection()

    sql_create_table = """ CREATE TABLE IF NOT EXISTS brewers (
                            id integer PRIMARY KEY,
                            name text NOT NULL,
                            identifier text NOT NULL );"""
    c = conn.cursor()
    c.execute(sql_create_table)
    conn.close()


db_setup()
brew_name = "Fruit Beer"
brew_month = "October"
identifiers = list(string.ascii_uppercase) + list(range(1, 100))


def get_identifier(name):
    conn = get_db_connection()
    c = conn.cursor()
    for identifier in identifiers:
        c.execute('''SELECT identifier FROM brewers WHERE identifier=?''', (str(identifier),))
        data = c.fetchone()
        if data is None:
            print("Assigning " + identifier + " to " + name)
            c.execute("INSERT INTO brewers (name,identifier) VALUES(?, ?)",(name, identifier) )
            conn.commit()
            conn.close()
            return identifier


@app.route('/')
def hello_world():
    return render_template('index.html', brew_name=brew_name, brew_month=brew_month)


@app.route('/generate', methods=["POST"])
def generate():
    identifier = get_identifier(request.form['name'])
    return render_template('generate.html', brew_name=brew_name, brew_month=brew_month, identifier=identifier)


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