import os
from datetime import datetime
from flask import Flask
import mysql.connector


class DBManager:
    def __init__(self, database='flask', host="db", user="flasku", password="flaskp"):
        envuser = os.getenv("MYSQL_USER")
        envpass = os.getenv("MYSQL_PASSWORD")
        #printf("DEBUG:" + envuser + envpass)
        self.connection = mysql.connector.connect(
            user=envuser, 
            #user=user, 
            password=envpass,
            #password=password,
            host=host, # name of the mysql service as set in the docker compose file
            database=database
            #auth_plugin='mysql_native_password'
        )
        self.cursor = self.connection.cursor()
    
    def populate_db(self):
        self.cursor.execute('DROP TABLE IF EXISTS blog')
        self.cursor.execute('CREATE TABLE blog (id INT AUTO_INCREMENT PRIMARY KEY, title VARCHAR(255))')
        self.cursor.executemany('INSERT INTO blog (id, title) VALUES (%s, %s);', [(i, 'Database entry #%d'% i) for i in range (1,5)])
        self.connection.commit()
    
    def query_titles(self):
        self.cursor.execute('SELECT title FROM blog')
        rec = []
        for c in self.cursor:
            rec.append(c[0])
        return rec


server = Flask(__name__)
conn = None

@server.route('/')
def listBlog():
    global conn
    if not conn:
        conn = DBManager()
        conn.populate_db()
    rec = conn.query_titles()

    response = ''
    for c in rec:
        response = response  + '<div>   Log:  ' + c + '</div>'

    dt = datetime.now()
    dtFormatted = dt.strftime("%Y-%m-%d %H:%M")
    response = response + '<div>Delta: ' + dtFormatted + '</div>'
    return response


if __name__ == '__main__':
    server.run()