"""
config.py
=========
Configuration object loaded by Flask from environment variables.

Most operational settings are editable at runtime from /admin/settings and
stored in booth_settings.json on disk. Sensitive values (SMTP password) are
encrypted with the Flask SECRET_KEY when saved.

Environment variables (defaults shown):
  Required:
    - APP_SECRET_KEY      long random string for Flask sessions and encryption
    - ADMIN_PASSWORD      plain-text password for /admin login
    - PUBLIC_BASE_URL     public URL customers use (e.g. https://booth.example.com)
    - SMTP_PASS           password for the SMTP account
  Optional:
    - BOOTH_NAME          name in customer text and emails (default Trollgorithm Theme Songs)
    - HOST_PORT           docker-compose host-side port mapping (default 127.0.0.1:8000)
    - INTERNAL_PORT       gunicorn port inside the container (default 8000)
    - MAX_REVISIONS       default customer revision limit (default 2)
    - PRICE_PER_VERSION   price shown to customers (default 10.00)
    - CURRENCY            currency label (default CAD)
    - DATABASE            SQLite database path inside the container (default /app/data/booth.db)
    - UPLOAD_FOLDER       directory for uploaded MP3s inside the container (default /app/uploads)
    - SETTINGS_FILE       runtime settings JSON filename (default booth_settings.json)
    - SMTP_HOST           outgoing mail server (default mailroot8.namespro.ca)
    - SMTP_PORT           outgoing mail server port (default 465)
    - SMTP_USER           SMTP login username (default ai@hallsworth.ca)
    - SMTP_FROM           From address for customer emails (default ai@hallsworth.ca)
"""

import os
from dotenv import load_dotenv

from pathlib import Path

# Load variables from .env file if present (development mode).
load_dotenv()


def _load_version():
    """Read the package version from the VERSION file next to this module."""
    version_file = Path(__file__).parent / 'VERSION'
    if version_file.exists():
        return version_file.read_text().strip()
    return '0.0.0'


class Config:
    # Flask secret key: used to sign session cookies and encrypt stored credentials.
    SECRET_KEY = os.environ.get('APP_SECRET_KEY', 'dev-secret-change-me')

    # SQLite database path inside the container.
    DATABASE = os.environ.get('DATABASE', '/app/data/booth.db')

    # Directory where uploaded MP3 files are stored inside the container.
    UPLOAD_FOLDER = os.environ.get('UPLOAD_FOLDER', '/app/uploads')

    # Runtime settings file: stored next to the upload folder for persistence.
    SETTINGS_FILE = os.environ.get('SETTINGS_FILE', 'booth_settings.json')

    # Only MP3 uploads are allowed.
    ALLOWED_EXTENSIONS = {'mp3'}

    # Default SMTP server settings for sending customer emails.
    # These can be overridden from /admin/settings and stored encrypted.
    SMTP_HOST = os.environ.get('SMTP_HOST', 'mailroot8.namespro.ca')
    SMTP_PORT = int(os.environ.get('SMTP_PORT', '465'))
    SMTP_USER = os.environ.get('SMTP_USER', 'ai@hallsworth.ca')
    SMTP_PASS = os.environ.get('SMTP_PASS', '')
    SMTP_FROM = os.environ.get('SMTP_FROM', 'ai@hallsworth.ca')

    # Admin login password (plain text, set via env).
    ADMIN_PASSWORD = os.environ.get('ADMIN_PASSWORD', '')

    # Public HTTPS URL used in customer emails and QR codes.
    PUBLIC_BASE_URL = os.environ.get('PUBLIC_BASE_URL', 'http://127.0.0.1:5000')

    # Default customer revision limit if not overridden in runtime settings.
    MAX_REVISIONS = int(os.environ.get('MAX_REVISIONS', '2'))

    # API key used by Hermes / an AI assistant to POST generated Suno prompts
    # back to /api/prompt/<id>. If provided via env var it overrides the value
    # stored in runtime settings. Stored encrypted when set from /admin/settings.
    HERMES_API_KEY = os.environ.get('HERMES_API_KEY', '')

    # Booth name used in customer-facing text and email sign-offs.
    BOOTH_NAME = os.environ.get('BOOTH_NAME', 'Trollgorithm Theme Songs')

    # Internal port gunicorn listens on inside the container (also exposed in Dockerfile).
    INTERNAL_PORT = int(os.environ.get('INTERNAL_PORT', '8000'))

    # Legacy single-price label. Current pricing is configured per-item from
    # /admin/pricing, but this value is still displayed in a few templates.
    PRICE_PER_VERSION = float(os.environ.get('PRICE_PER_VERSION', '10.00'))
    CURRENCY = os.environ.get('CURRENCY', 'CAD')

    # Package version, read from VERSION file.
    VERSION = _load_version()

    # MusicGPT API key (env only; never stored in repo).
    MUSICGPT_API_KEY = os.environ.get('MUSICGPT_API_KEY', '')

    # Available MusicGPT generation models.
    MUSICGPT_MODELS = ['v6', 'v6-pro']
    MUSICGPT_DEFAULT_MODEL = os.environ.get('MUSICGPT_DEFAULT_MODEL', 'v6-pro')

    @classmethod
    def musicgpt_webhook_base_url(cls):
        """Return the public base URL used for MusicGPT webhooks."""
        return cls.PUBLIC_BASE_URL.rstrip('/')