import os

from django.contrib import admin
from django.http import HttpResponseNotFound
from django.urls import include, path, re_path
from django.views.generic import RedirectView, TemplateView
from django.views.static import serve as static_serve

from django.conf import settings

from meals.views_spa import spa_serve
from meals.views_dashboard import dashboard_api
from meals.views_spa import _get_frontend_dir


def _serve_fe_assets(request, path=''):
    """Serve built React assets (JS/CSS) from the frontend directory."""
    fdir = _get_frontend_dir()
    rel = os.path.join('assets', path)
    target = os.path.normpath(os.path.join(fdir, rel))
    if target.startswith(os.path.normpath(fdir)) and os.path.isfile(target):
        return static_serve(request, rel, document_root=fdir)
    return HttpResponseNotFound('Not found')

urlpatterns = [
    path('', TemplateView.as_view(template_name='index.html'), name='index'),
    path('app/', spa_serve, name='spa_serve'),
    path('app/<path:path>', spa_serve, name='spa_serve_path'),
    re_path(r'^assets/(?P<path>.+)$', _serve_fe_assets, name='fe_assets'),
    path('admin/', admin.site.urls),
    path('api/', include('meals.urls')),
    path('api/dashboard/', dashboard_api, name='dashboard_api'),
    path('dashboard/', RedirectView.as_view(url='/admin/', permanent=False), name='dashboard_redirect'),
]

# When DEBUG is off (e.g. desktop.py / EXE mode), serve static files directly
# so the Django admin and Jazzmin theme load correctly.
if not settings.DEBUG:
    from django.contrib.staticfiles import finders as _sf_finders

    def _serve_static(request, path=''):
        """Search all static file roots for the requested path."""
        for root in _static_roots:
            target = os.path.normpath(os.path.join(root, path))
            if target.startswith(root) and os.path.isfile(target):
                return static_serve(request, path, document_root=root)
        from django.http import Http404
        raise Http404

    _static_roots = []
    for _d in settings.STATICFILES_DIRS:
        if os.path.isdir(_d):
            _static_roots.append(os.path.normpath(_d))
    for _finder in _sf_finders.get_finders():
        for _path, _storage in _finder.list([]):
            _loc = getattr(_storage, 'location', None)
            if _loc and os.path.isdir(_loc):
                _static_roots.append(os.path.normpath(_loc))
    urlpatterns += [
        re_path(r'^static/(?P<path>.+)$', _serve_static),
    ]