"""Application entry point with DDD architecture.

This module is the main entry point for the FastAPI application.
Configures DI container, middleware, and routes following DDD principles.
"""

from collections.abc import AsyncGenerator
from contextlib import asynccontextmanager

import uvicorn
from dishka import make_async_container
from dishka.integrations.fastapi import setup_dishka
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from app.infrastructure import close_db, init_db, register_exception_handlers, settings
from app.infrastructure.di.providers import (
    DatabaseProvider,
    KeycloakProvider,
    RepositoryProvider,
    TransactionManagerProvider,
    UseCaseProvider,
)
from app.presentation import router


@asynccontextmanager
async def lifespan(app: FastAPI) -> AsyncGenerator[None]:
    """Application lifespan manager.

    Handles startup and shutdown tasks for the application.

    Args:
        app: FastAPI application instance.

    Yields:
        None during application runtime.
    """
    await init_db()
    yield
    await close_db()


def app_factory() -> FastAPI:
    """Create and configure FastAPI application.

    Sets up DI container, exception handlers, middleware, and routes.

    Returns:
        Configured FastAPI application instance.
    """
    app = FastAPI(
        title=settings.app.name,
        debug=settings.app.debug,
        lifespan=lifespan,
        docs_url="/docs" if settings.is_dev else None,
        redoc_url="/redoc" if settings.is_dev else None,
    )

    container = make_async_container(
        DatabaseProvider(),
        RepositoryProvider(),
        TransactionManagerProvider(),
        UseCaseProvider(),
        KeycloakProvider(),
    )
    setup_dishka(container, app)

    register_exception_handlers(app)

    app.add_middleware(
        CORSMiddleware,
        allow_origins=["*"],
        allow_credentials=True,
        allow_methods=["*"],
        allow_headers=["*"],
    )

    app.include_router(router, prefix="/api")

    @app.get("/health", tags=["health"])
    async def health_check() -> dict[str, str]:
        """Health check endpoint.

        Returns:
            Status information dictionary.
        """
        return {
            "status": "ok",
            "app": settings.app.name,
            "env": settings.environment.value,
        }

    return app


def main() -> None:
    """Run the application.

    Starts uvicorn server with application factory.
    """
    uvicorn.run(
        app_factory,
        factory=True,
        host=settings.app.host,
        port=settings.app.port,
    )


if __name__ == "__main__":
    main()