# ==============================================================================
# Formeleon - Multi-tenant Form Generator
# Author: Björn Runden <br@runden.net>
# Module: config.py
# Description: Application configuration with environment variable support.
#              Handles development mode, reCAPTCHA, Zitadel OIDC, and database settings.
# ==============================================================================

"""
Application configuration module for Formeleon.

This module centralizes all configuration settings for the Flask application,
loading from environment variables with sensible defaults for development.

Environment Variables:
    - DEV_MODE: Enable development mode (default: False)
    - SECRET_KEY: Flask secret key for session management
    - SQLALCHEMY_DATABASE_URI: Database connection string
    - SQLALCHEMY_TRACK_MODIFICATIONS: Track modifications (default: False)
    
    - ZITADEL_ISSUER: OIDC issuer URL for Zitadel
    - ZITADEL_CLIENT_ID: OIDC client ID
    - ZITADEL_CLIENT_SECRET: OIDC client secret
    - ZITADEL_REDIRECT_URI: OIDC redirect URI
    
    - RECAPTCHA_SECRET_KEY: reCAPTCHA v3 secret key
    - RECAPTCHA_SITE_KEY: reCAPTCHA v3 site key
    - RECAPTCHA_THRESHOLD: Minimum score threshold (default: 0.5)
    - MOCK_RECAPTCHA_SCORE: Mock score for dev mode (default: 0.9)
    
    - DEV_USER_ROLE: Role for dev mode user (default: 'admin')
    - DEV_TENANT_ID: Tenant ID for dev mode (default: 'tenant_dev_123')
    - DEV_USER_NAME: Username for dev mode (default: 'Dev Admin')
    - DEV_USER_EMAIL: Email for dev mode (default: 'dev@formeleon.local')
"""

import os
from typing import Optional


BASE_DIR = os.path.abspath(os.path.dirname(__file__))

class Config:
    """
    Base configuration class with default values.
    
    All configuration values can be overridden via environment variables.
    """
    
    # Flask Core Settings
    SECRET_KEY: str = os.environ.get('SECRET_KEY', 'dev-secret-key-change-in-production')
    DEBUG: bool = os.environ.get('FLASK_DEBUG', 'false').lower() == 'true'
    TESTING: bool = os.environ.get('FLASK_TESTING', 'false').lower() == 'true'
    
    # Development Mode
    DEV_MODE: bool = os.environ.get('DEV_MODE', 'false').lower() == 'true'
    
    # Dev User Settings
    DEV_USER_ROLE: str = os.environ.get('DEV_USER_ROLE', 'admin')
    DEV_TENANT_ID: str = os.environ.get('DEV_TENANT_ID', 'tenant_dev_123')
    DEV_USER_NAME: str = os.environ.get('DEV_USER_NAME', 'Dev Admin')
    DEV_USER_EMAIL: str = os.environ.get('DEV_USER_EMAIL', 'dev@formeleon.local')
    
    # Database Configuration
    if 'SQLALCHEMY_DATABASE_URI' in os.environ:
        SQLALCHEMY_DATABASE_URI: str = os.environ['SQLALCHEMY_DATABASE_URI']
    else:
        SQLALCHEMY_DATABASE_URI: str = f'sqlite:///{os.path.join(BASE_DIR, "instance", "formeleon.db")}'

    SQLALCHEMY_TRACK_MODIFICATIONS: bool = False
    SQLALCHEMY_ECHO: bool = os.environ.get('SQLALCHEMY_ECHO', 'false').lower() == 'true'
    
    # Zitadel OIDC Configuration
    ZITADEL_ISSUER: Optional[str] = os.environ.get('ZITADEL_ISSUER')
    ZITADEL_CLIENT_ID: Optional[str] = os.environ.get('ZITADEL_CLIENT_ID')
    ZITADEL_CLIENT_SECRET: Optional[str] = os.environ.get('ZITADEL_CLIENT_SECRET')
    ZITADEL_REDIRECT_URI: Optional[str] = os.environ.get(
        'ZITADEL_REDIRECT_URI', 
        'http://localhost:5000/auth/callback'
    )
    ZITADEL_SCOPES: list = ['openid', 'profile', 'email']
    
    # reCAPTCHA v3 Configuration
    RECAPTCHA_SECRET_KEY: Optional[str] = os.environ.get('RECAPTCHA_SECRET_KEY')
    RECAPTCHA_SITE_KEY: Optional[str] = os.environ.get('RECAPTCHA_SITE_KEY')
    RECAPTCHA_THRESHOLD: float = float(os.environ.get('RECAPTCHA_THRESHOLD', '0.5'))
    MOCK_RECAPTCHA_SCORE: float = float(os.environ.get('MOCK_RECAPTCHA_SCORE', '0.9'))
    RECAPTCHA_VERIFY_URL: str = 'https://www.google.com/recaptcha/api/siteverify'
    
    # Application Settings
    DEFAULT_PAGE_SIZE: int = 20
    MAX_PAGE_SIZE: int = 100
    
    # Form Submission Settings
    ALLOWED_ORIGINS: list = os.environ.get('ALLOWED_ORIGINS', '*').split(',')
    ENABLE_CORS: bool = os.environ.get('ENABLE_CORS', 'true').lower() == 'true'
    
    # File Upload Settings
    MAX_CONTENT_LENGTH: int = 16 * 1024 * 1024  # 16MB
    UPLOAD_FOLDER: str = os.environ.get('UPLOAD_FOLDER', '/tmp/formeleon_uploads')
    ALLOWED_EXTENSIONS: set = {'png', 'jpg', 'jpeg', 'gif', 'pdf', 'txt'}
    
    # Session Configuration
    SESSION_COOKIE_SECURE: bool = os.environ.get('SESSION_COOKIE_SECURE', 'false').lower() == 'true'
    SESSION_COOKIE_HTTPONLY: bool = True
    SESSION_COOKIE_SAMESITE: str = os.environ.get('SESSION_COOKIE_SAMESITE', 'Lax')
    PERMANENT_SESSION_LIFETIME: int = 3600  # 1 hour in seconds
    
    def is_dev_mode(self) -> bool:
        """
        Check if application is running in development mode.
        
        :return: True if DEV_MODE is enabled, False otherwise.
        """
        return self.DEV_MODE
    
    def is_recaptcha_enabled(self) -> bool:
        """
        Check if reCAPTCHA is properly configured.
        
        :return: True if both secret and site keys are configured, False otherwise.
        """
        return (self.RECAPTCHA_SECRET_KEY is not None and 
                self.RECAPTCHA_SITE_KEY is not None)
    
    def is_zitadel_enabled(self) -> bool:
        """
        Check if Zitadel OIDC is properly configured.
        
        :return: True if all required Zitadel settings are present, False otherwise.
        """
        return (self.ZITADEL_ISSUER is not None and 
                self.ZITADEL_CLIENT_ID is not None and 
                self.ZITADEL_CLIENT_SECRET is not None)


class DevelopmentConfig(Config):
    """
    Development-specific configuration.
    
    Overrides base configuration with development-friendly settings.
    """
    DEBUG: bool = True
    DEV_MODE: bool = True
    SQLALCHEMY_ECHO: bool = True
    SESSION_COOKIE_SECURE: bool = False


class ProductionConfig(Config):
    """
    Production-specific configuration.
    
    Overrides base configuration with production-safe settings.
    """
    DEBUG: bool = False
    DEV_MODE: bool = False
    SQLALCHEMY_ECHO: bool = False
    SESSION_COOKIE_SECURE: bool = True
    SESSION_COOKIE_SAMESITE: str = 'Strict'


class TestingConfig(Config):
    """
    Testing-specific configuration.
    
    Overrides base configuration with test-friendly settings.
    """
    TESTING: bool = True
    SQLALCHEMY_DATABASE_URI: str = 'sqlite:///:memory:'
    WTF_CSRF_ENABLED: bool = False


# Configuration mapping for easy access
config_map: dict = {
    'development': DevelopmentConfig,
    'production': ProductionConfig,
    'testing': TestingConfig,
    'default': DevelopmentConfig if os.environ.get('FLASK_ENV', 'development') == 'development' else ProductionConfig
}