from fastapi import FastAPI
from fastapi.staticfiles import StaticFiles

from admin_app.api.router import api_router
from admin_app.core.settings import AdminSettings, get_admin_settings
from admin_app.view import PANEL_STATIC_DIRECTORY, PANEL_STATIC_MOUNT_NAME, panel_router


# Fabrica explicita do runtime administrativo para facilitar testes e futura configuracao.
def create_app(settings: AdminSettings | None = None) -> FastAPI:
    resolved_settings = settings or get_admin_settings()
    app = FastAPI(
        title=resolved_settings.admin_app_name,
        version=resolved_settings.admin_version,
        debug=resolved_settings.admin_debug,
    )
    app.state.admin_settings = resolved_settings
    app.mount(
        _build_panel_static_path(resolved_settings.admin_api_prefix),
        StaticFiles(directory=str(PANEL_STATIC_DIRECTORY)),
        name=PANEL_STATIC_MOUNT_NAME,
    )
    app.include_router(api_router, prefix=resolved_settings.admin_api_prefix)
    app.include_router(panel_router, prefix=resolved_settings.admin_api_prefix)
    return app


def _build_panel_static_path(api_prefix: str) -> str:
    normalized_prefix = api_prefix.rstrip("/")
    if normalized_prefix:
        return f"{normalized_prefix}/panel/assets"
    return "/panel/assets"