"""Application entrypoint and router wiring."""

from fastapi import Depends, FastAPI
from fastapi.middleware.cors import CORSMiddleware

from api.v1.router import router as api_v1_router
from core.config import Settings, get_settings
from features.health.router import build_health_payload
from features.health.schemas import HealthResponse


def create_app() -> FastAPI:
    """Create and configure the FastAPI application."""
    app = FastAPI(
        title="avaaz-backend",
        version="0.1.0",
        docs_url="/docs",
        redoc_url="/redoc",
    )

    # CORS for local dev (frontend on 3000). Tighten/override in prod.
    app.add_middleware(
        CORSMiddleware,
        allow_origins=["http://localhost:3000", "http://127.0.0.1:3000"],
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    app.include_router(api_v1_router, prefix="/api/v1")

    @app.get("/healthz", tags=["health"], response_model=HealthResponse)
    def liveness(settings: Settings = Depends(get_settings)) -> HealthResponse:
        """Liveness probe: process is up."""
        return build_health_payload(settings)

    @app.get("/readyz", tags=["health"], response_model=HealthResponse)
    def readiness(settings: Settings = Depends(get_settings)) -> HealthResponse:
        """
        Readiness probe: instance can serve traffic.

        Extend to check dependencies (DB, cache, queues) when they are added.
        """
        return build_health_payload(settings)

    return app


app = create_app()