import os
from dotenv import load_dotenv

load_dotenv()

class Config:
    SECRET_KEY = os.environ.get('SECRET_KEY') or 'dev-secret-key-change-in-production'
    SQLALCHEMY_DATABASE_URI = (
        f"mysql+pymysql://{os.environ.get('DB_USER', 'root')}:"
        f"{os.environ.get('DB_PASSWORD', '')}@"
        f"{os.environ.get('DB_HOST', 'localhost')}:"
        f"{os.environ.get('DB_PORT', '3306')}/"
        f"{os.environ.get('DB_NAME', 'it_tickets')}"
    )
    SQLALCHEMY_TRACK_MODIFICATIONS = False
    SQLALCHEMY_ENGINE_OPTIONS = {
        'pool_recycle': 300,
        'pool_pre_ping': True,
    }

    # Mail
    MAIL_SERVER = os.environ.get('MAIL_SERVER', 'localhost')
    MAIL_PORT = int(os.environ.get('MAIL_PORT', 587))
    MAIL_USE_TLS = os.environ.get('MAIL_USE_TLS', 'True').lower() == 'true'
    MAIL_USERNAME = os.environ.get('MAIL_USERNAME')
    MAIL_PASSWORD = os.environ.get('MAIL_PASSWORD')
    MAIL_DEFAULT_SENDER = os.environ.get('MAIL_DEFAULT_SENDER', 'IT Helpdesk <noreply@yourdomain.com>')

    # IT Department
    IT_DEPT_EMAIL = os.environ.get('IT_DEPT_EMAIL', 'it@yourdomain.com')
    APP_BASE_URL = os.environ.get('APP_BASE_URL', 'http://localhost:5000')

    # Uploads
    # UPLOAD_FOLDER must be an absolute path so that save (os.path.join) and
    # serve (send_from_directory) always resolve to the same directory regardless
    # of the process CWD. The default anchors to the project root via __file__.
    _project_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
    _raw_upload   = os.environ.get('UPLOAD_FOLDER', '')
    UPLOAD_FOLDER = (
        _raw_upload if (_raw_upload and os.path.isabs(_raw_upload))
        else os.path.join(_project_root, 'app', 'static', 'uploads')
    )
    MAX_CONTENT_LENGTH = int(os.environ.get('MAX_CONTENT_LENGTH', 16 * 1024 * 1024))
    ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif', 'pdf', 'doc', 'docx', 'txt', 'zip', 'log'}

    # Anthropic AI
    ANTHROPIC_API_KEY = os.environ.get('ANTHROPIC_API_KEY', '')

    # Admin
    ADMIN_EMAIL = os.environ.get('ADMIN_EMAIL', 'admin@yourdomain.com')
    ADMIN_PASSWORD = os.environ.get('ADMIN_PASSWORD', 'Admin@123!')


class DevelopmentConfig(Config):
    DEBUG = True
    SQLALCHEMY_ECHO = False


class ProductionConfig(Config):
    DEBUG = False


config = {
    'development': DevelopmentConfig,
    'production': ProductionConfig,
    'default': ProductionConfig
}