import sys
import os
import asyncio
from pathlib import Path

backend_dir = Path(__file__).parent.parent.parent
if str(backend_dir) not in sys.path:
    sys.path.insert(0, str(backend_dir))

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from contextlib import asynccontextmanager
from dishka.integrations.fastapi import setup_dishka
from dishka import Container
from src.shared.config import settings
from src.shared.exceptions import LawyerAIException
from src.shared.di_container import create_container
from src.presentation.middleware.error_handler import exception_handler
from src.presentation.api.v1 import users, collections, documents, conversations, messages, rag
from src.infrastructure.database.base import engine, Base


@asynccontextmanager
async def lifespan(app: FastAPI):
    """Управление жизненным циклом приложения"""
    try:
        async with engine.begin() as conn:
            await conn.run_sync(Base.metadata.create_all)
    except Exception as e:
        print(f"Примечание при создании таблиц: {e}")
    yield
    if hasattr(app.state, 'container') and hasattr(app.state.container, 'close'):
        if asyncio.iscoroutinefunction(app.state.container.close):
            await app.state.container.close()
        else:
            app.state.container.close()
    await engine.dispose()


app = FastAPI(
    title=settings.APP_NAME,
    description="API для системы ИИ-юриста",
    version="1.0.0",
    lifespan=lifespan
)

container = create_container()
setup_dishka(container, app)
app.state.container = container

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

app.add_exception_handler(LawyerAIException, exception_handler)

app.include_router(users.router, prefix="/api/v1")
app.include_router(collections.router, prefix="/api/v1")
app.include_router(documents.router, prefix="/api/v1")
app.include_router(conversations.router, prefix="/api/v1")
app.include_router(messages.router, prefix="/api/v1")
app.include_router(rag.router, prefix="/api/v1")

try:
    from src.presentation.api.v1 import admin
    app.include_router(admin.router, prefix="/api/v1")
except (ImportError, AttributeError) as e:
    print(f"Админ-панель не загружена: {e}")
    pass


@app.get("/")
async def root():
    """Корневой эндпоинт"""
    return {
        "message": "Добро пожаловать в API ИИ-юриста",
        "version": "1.0.0",
        "docs": "/docs"
    }


@app.get("/health")
async def health_check():
    """Проверка здоровья приложения"""
    return {"status": "ok"}