import os
from datetime import timedelta


class Config:
    """Base configuration"""
    SECRET_KEY = os.environ.get("SECRET_KEY") or "dev-secret-key-change-in-production"
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    JWT_SECRET_KEY = os.environ.get("JWT_SECRET_KEY") or "jwt-secret-key-change-in-production"
    JWT_ACCESS_TOKEN_EXPIRES = timedelta(hours=1)
    JWT_REFRESH_TOKEN_EXPIRES = timedelta(days=30)
    CORS_ORIGINS = os.environ.get("CORS_ORIGINS", "*")


class DevelopmentConfig(Config):
    """Development configuration"""
    DEBUG = True
    SQLALCHEMY_DATABASE_URI = os.environ.get("DEV_DATABASE_URL") or "sqlite:///dev.db"


class TestingConfig(Config):
    """Testing configuration"""
    TESTING = True
    SQLALCHEMY_DATABASE_URI = os.environ.get("TEST_DATABASE_URL") or "sqlite:///test.db"
    WTF_CSRF_ENABLED = False


class ProductionConfig(Config):
    """Production configuration"""
    DEBUG = False
    SQLALCHEMY_DATABASE_URI = os.environ.get("DATABASE_URL") or "postgresql://user:password@localhost/proddb"
    
    # Security headers
    SESSION_COOKIE_SECURE = True
    SESSION_COOKIE_HTTPONLY = True
    SESSION_COOKIE_SAMESITE = "Lax"


config_by_name = {
    "dev": DevelopmentConfig,
    "test": TestingConfig,
    "prod": ProductionConfig
}