"""Template path helpers shared by web/auth routes.

The packaged PyInstaller build stores templates under the bundled resource
folder, while source runs use the repository checkout. Keep route modules from
hardcoding relative template paths such as ``src/landppt/web/templates``.
"""

from __future__ import annotations

import os
import sys

from fastapi.templating import Jinja2Templates


def get_templates_dir() -> str:
    """Resolve the template directory for source and PyInstaller packaged runs."""
    candidates: list[str] = []

    if getattr(sys, "frozen", False):
        executable_dir = os.path.dirname(sys.executable)
        meipass = getattr(sys, "_MEIPASS", "")
        candidates.extend([
            os.path.join(meipass, "src", "landppt", "web", "templates"),
            os.path.join(executable_dir, "_internal", "src", "landppt", "web", "templates"),
            os.path.join(executable_dir, "src", "landppt", "web", "templates"),
        ])

    candidates.extend([
        os.path.abspath(os.path.join(os.path.dirname(__file__), "templates")),
        os.path.abspath("src/landppt/web/templates"),
    ])

    for candidate in candidates:
        if candidate and os.path.isdir(candidate):
            return candidate

    return candidates[0]


def create_templates() -> Jinja2Templates:
    """Create a Jinja2Templates instance using the resolved template path."""
    return Jinja2Templates(directory=get_templates_dir())