# -*- coding: utf-8 -*-
"""
Application Configuration Module for MYP Platform
================================================

Flask configuration classes for different environments.
"""

import os
from datetime import timedelta

# Base configuration directory
BASE_DIR = os.path.abspath(os.path.dirname(__file__))
PROJECT_ROOT = os.path.abspath(os.path.join(BASE_DIR, '..', '..'))

class Config:
    """Base configuration class with common settings."""
    
    # Secret key for Flask sessions and CSRF protection
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'dev-secret-key-change-in-production-744563017196A'
    
    # Session configuration
    PERMANENT_SESSION_LIFETIME = timedelta(hours=24)
    SESSION_COOKIE_SECURE = False  # Set to True in production with HTTPS
    SESSION_COOKIE_HTTPONLY = True
    SESSION_COOKIE_SAMESITE = 'Lax'
    
    # Database configuration
    DATABASE_URL = os.environ.get('DATABASE_URL') or f'sqlite:///{os.path.join(PROJECT_ROOT, "data", "myp_platform.db")}'
    SQLALCHEMY_DATABASE_URI = DATABASE_URL
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    SQLALCHEMY_ENGINE_OPTIONS = {
        'pool_pre_ping': True,
        'pool_recycle': 300,
    }
    
    # Upload configuration
    UPLOAD_FOLDER = os.path.join(PROJECT_ROOT, 'uploads')
    MAX_CONTENT_LENGTH = 500 * 1024 * 1024  # 500MB max file size
    ALLOWED_EXTENSIONS = {'gcode', 'stl', 'obj', '3mf', 'amf'}
    
    # Security configuration
    WTF_CSRF_ENABLED = True
    WTF_CSRF_TIME_LIMIT = 3600  # 1 hour
    
    # Mail configuration (optional)
    MAIL_SERVER = os.environ.get('MAIL_SERVER')
    MAIL_PORT = int(os.environ.get('MAIL_PORT') or 587)
    MAIL_USE_TLS = os.environ.get('MAIL_USE_TLS', 'true').lower() in ['true', 'on', '1']
    MAIL_USERNAME = os.environ.get('MAIL_USERNAME')
    MAIL_PASSWORD = os.environ.get('MAIL_PASSWORD')
    
    # Logging configuration
    LOG_LEVEL = os.environ.get('LOG_LEVEL', 'INFO')
    LOG_FILE_MAX_BYTES = 10 * 1024 * 1024  # 10MB
    LOG_BACKUP_COUNT = 5
    
    # Application-specific settings
    SCHEDULER_ENABLED = os.environ.get('SCHEDULER_ENABLED', 'true').lower() in ['true', 'on', '1']
    SCHEDULER_INTERVAL = int(os.environ.get('SCHEDULER_INTERVAL', '60'))  # seconds
    
    # SSL/HTTPS configuration
    SSL_ENABLED = os.environ.get('SSL_ENABLED', 'false').lower() in ['true', 'on', '1']
    SSL_CERT_PATH = os.environ.get('SSL_CERT_PATH')
    SSL_KEY_PATH = os.environ.get('SSL_KEY_PATH')
    
    # Network configuration
    DEFAULT_PORT = int(os.environ.get('PORT', '5000'))
    DEFAULT_HOST = os.environ.get('HOST', '0.0.0.0')
    
    @staticmethod
    def init_app(app):
        """Initialize application with this configuration."""
        pass


class DevelopmentConfig(Config):
    """Development environment configuration."""
    
    DEBUG = True
    TESTING = False
    
    # More verbose logging in development
    LOG_LEVEL = 'DEBUG'
    
    # Disable some security features for easier development
    SESSION_COOKIE_SECURE = False
    WTF_CSRF_ENABLED = False  # Disable CSRF for easier API testing
    
    @staticmethod
    def init_app(app):
        Config.init_app(app)
        
        # Development-specific initialization
        import logging
        logging.basicConfig(level=logging.DEBUG)


class TestingConfig(Config):
    """Testing environment configuration."""
    
    TESTING = True
    DEBUG = True
    
    # Use in-memory database for testing
    DATABASE_URL = 'sqlite:///:memory:'
    SQLALCHEMY_DATABASE_URI = DATABASE_URL
    
    # Disable CSRF for testing
    WTF_CSRF_ENABLED = False
    
    # Shorter session lifetime for testing
    PERMANENT_SESSION_LIFETIME = timedelta(minutes=5)
    
    @staticmethod
    def init_app(app):
        Config.init_app(app)


class ProductionConfig(Config):
    """Production environment configuration."""
    
    DEBUG = False
    TESTING = False
    
    # Strict security settings for production
    SESSION_COOKIE_SECURE = True  # Requires HTTPS
    WTF_CSRF_ENABLED = True
    
    # Production logging
    LOG_LEVEL = 'WARNING'
    
    # SSL should be enabled in production
    SSL_ENABLED = True
    
    @staticmethod
    def init_app(app):
        Config.init_app(app)
        
        # Production-specific initialization
        import logging
        from logging.handlers import RotatingFileHandler
        
        # Set up file logging for production
        log_dir = os.path.join(os.path.dirname(app.instance_path), 'logs')
        if not os.path.exists(log_dir):
            os.makedirs(log_dir)
        
        file_handler = RotatingFileHandler(
            os.path.join(log_dir, 'myp_platform.log'),
            maxBytes=Config.LOG_FILE_MAX_BYTES,
            backupCount=Config.LOG_BACKUP_COUNT
        )
        file_handler.setFormatter(logging.Formatter(
            '%(asctime)s %(levelname)s: %(message)s [in %(pathname)s:%(lineno)d]'
        ))
        file_handler.setLevel(logging.WARNING)
        app.logger.addHandler(file_handler)
        app.logger.setLevel(logging.WARNING)


# Configuration dictionary for easy access
config = {
    'development': DevelopmentConfig,
    'testing': TestingConfig,
    'production': ProductionConfig,
    'default': DevelopmentConfig
}


def get_config_by_name(config_name):
    """
    Get configuration class by name.
    
    Args:
        config_name (str): Name of the configuration ('development', 'testing', 'production')
        
    Returns:
        Config: Configuration class
    """
    return config.get(config_name, config['default'])