"""
Application-level constants for Curator (build/runtime metadata).

This module derives the app version and debug flag. The version is loaded from
`pyproject.toml` (preferred) with a generated `src/_version.py` fallback for
frozen/PyInstaller builds. Debug mode is controlled via `.env` (`ENV_DEBUG`).

It is the single source of truth for app metadata used across the GUI and build
tooling (`APP_NAME`, `APP_VERSION`/`VERSION`, `APP_TITLE`, `APP_VIEWPORT`).
"""

import os
import tomllib
from pathlib import Path

from dotenv import load_dotenv

load_dotenv()

_PYPROJECT_PATH = Path(__file__).parent.parent / "pyproject.toml"
_VERSION_FILE = Path(__file__).parent / "_version.py"

APP_NAME: str = "Curator"


def get_version() -> str:
    """Return the project version (pyproject → _version.py → unknown)."""
    # 1. pyproject.toml (preferred)
    try:
        with open(_PYPROJECT_PATH, "rb") as f:
            version = tomllib.load(f)["project"]["version"]
        # Cache a fallback for frozen/PyInstaller builds (best-effort).
        try:
            _VERSION_FILE.write_text(
                f'"""Auto-generated — do not edit manually."""\n__version__ = "{version}"\n',
                encoding="utf-8",
            )
        except OSError:
            pass
        return version
    except (FileNotFoundError, KeyError):
        pass

    # 2. generated _version.py
    try:
        from src._version import __version__  # type: ignore[import]
        return __version__
    except ImportError:
        pass

    # 3. last resort
    return "0.0.0-unknown"


def get_debug_mode() -> bool:
    """Return True when ENV_DEBUG is set to a truthy value in the environment."""
    return os.getenv("ENV_DEBUG", "false").lower() in ("true", "1", "yes")


APP_VERSION: str = get_version()
ENV_DEBUG: bool = get_debug_mode()
APP_TITLE: str = f"{APP_NAME} v{APP_VERSION}" + ("-DEV" if ENV_DEBUG else "")

# Backwards-compatible alias used by prebuild.py
VERSION: str = APP_VERSION

# Default main-window geometry (used when no saved geometry exists)
APP_VIEWPORT: str = "1000x700"