config.py

import os
from dotenv import load_dotenv

basedir = os.path.abspath(os.path.dirname(__file__))
load_dotenv(os.path.join(basedir, '.env'))

class Config:
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'never-guess'
    SQLALCHEMY_DATABASE_URI = os.environ.get('DATABASE_URL') or \
        'sqlite:///' + os.path.join(basedir, 'app.db')
    PRODUCTS_PER_PAGE = 5
    PRODUCT_LISTING_PER_PAGE = 5
    ORDER_LISTING_PER_PAGE = 5
    FILTER_PRODUCT_PER_PAGE = 20
    ELASTICSEARCH_URL = os.environ.get('ELASTICSEARCH_URL')
    MAIL_SERVER = os.environ.get('MAIL_SERVER')
    MAIL_PORT = int(os.environ.get('MAIL_PORT') or 25)
    MAIL_USE_TLS = os.environ.get('MAIL_USE_TLS') is not None
    MAIL_EMAIL = os.environ.get('MAIL_EMAIL')
    MAIL_USERNAME = os.environ.get('MAIL_USERNAME')
    MAIL_PASSWORD = os.environ.get('MAIL_PASSWORD')
    MAX_CONTENT_LENGTH = 1024 * 1024 * 5 * 6
    UPLOAD_EXTENSIONS = ['.jpg', '.png', '.jpeg']
    UPLOAD_PATH = 'static/img/product_image'

class DevelopmentConfig(Config):
    DEBUG = True

class TestingConfig(Config):
    SQLALCHEMY_DATABASE_URI = "sqlite:///:memory"
    TESTING = True
    SQLALCHEMY_TRACK_MODIFICATIONS = False

class SeleniumTestingConfig(TestingConfig):
    SQLALCHEMY_DATABASE_URI = 'sqlite:///' + os.path.join(basedir, 'tests', 'testapp.db')
    
class ProductionConfig(Config):
    pass

# Map environment names to configuration classes
config_by_name = {
    'development': DevelopmentConfig,
    'testing': TestingConfig,
    'production': ProductionConfig,
}

# Default configuration
default_config = DevelopmentConfig

def get_config(env_name):
    # Returns the configuration class for the given environment name.
    # If the environment name is not recognized, returns the default configuration.
    return config_by_name.get(env_name, default_config)