from fastapi import FastAPI
from core_shared.observability import add_observability
from core_shared import try_build_redis_client
from core_shared.rate_limit import build_rate_limiter

from app.api.routes import router
from app.bootstrap.settings import ApiGatewaySettings
from app.db.session import build_session_factory
from app.infrastructure.request_context import GatewayRequestContextMiddleware


def create_app() -> FastAPI:
    settings = ApiGatewaySettings()
    app = FastAPI(
        title="agent-platform api-gateway",
        version="0.1.0",
    )
    app.state.settings = settings
    app.state.session_factory = build_session_factory(settings)
    app.state.rate_limiter = build_rate_limiter(try_build_redis_client(settings.redis_url))
    add_observability(app, settings.service_name)
    app.add_middleware(GatewayRequestContextMiddleware)
    app.include_router(router)
    return app