"""FastAPI application factory for FusionAGI Dvādaśa API."""

from typing import Any

from fusionagi.api.dependencies import SessionStore, default_orchestrator, set_app_state
from fusionagi.api.routes import router as api_router


def create_app(
    adapter: Any = None,
    cors_origins: list[str] | None = None,
) -> Any:
    """Create FastAPI app with Dvādaśa routes.

    Args:
        adapter: Optional LLMAdapter for head/Witness LLM calls.
        cors_origins: Optional list of CORS allowed origins (e.g. ["*"] or ["https://example.com"]).
            If None, no CORS middleware is added.
    """
    try:
        from fastapi import FastAPI
    except ImportError as e:
        raise ImportError("Install with: pip install fusionagi[api]") from e

    app = FastAPI(
        title="FusionAGI Dvādaśa API",
        description="12-headed multi-agent orchestration API",
        version="0.1.0",
    )
    app.state.llm_adapter = adapter
    from fusionagi.api.dependencies import set_default_adapter
    set_default_adapter(adapter)

    @app.on_event("startup")
    async def startup():
        """Initialize orchestrator and session store."""
        if getattr(app.state, "_dvadasa_ready", False):
            return
        adapter_inner = getattr(app.state, "llm_adapter", None)
        orch, bus = default_orchestrator(adapter_inner)
        store = SessionStore()
        set_app_state(orch, bus, store)
        app.state._dvadasa_ready = True

    app.include_router(api_router, prefix="/v1", tags=["dvadasa"])

    if cors_origins is not None:
        try:
            from fastapi.middleware.cors import CORSMiddleware
            app.add_middleware(
                CORSMiddleware,
                allow_origins=cors_origins,
                allow_methods=["*"],
                allow_headers=["*"],
            )
        except ImportError:
            pass  # CORS optional

    return app


# Default app instance for uvicorn/gunicorn
app = create_app()