# File : app/main.py
# Purpose : FastAPI application entry point for Banking RAG Platform

import os
from contextlib import asynccontextmanager
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from app.config import get_settings

settings = get_settings()

os.environ["LANGCHAIN_TRACING_V2"] = settings.langchain_tracing_v2
os.environ["LANGCHAIN_ENDPOINT"] = settings.langchain_endpoint
os.environ["LANGCHAIN_API_KEY"] = settings.langchain_api_key
os.environ["LANGCHAIN_PROJECT"] = settings.langchain_project


@asynccontextmanager
async def lifespan(app: FastAPI):
    print("[STARTUP] Banking RAG Platform starting...")
    from app.database.connection import init_db
    await init_db()
    print("[STARTUP] Database ready")
    yield
    print("[SHUTDOWN] Banking RAG Platform shutting down...")


app = FastAPI(
    title="Banking RAG Platform",
    description="Enterprise RAG system for RBI and Finance documents",
    version="1.0.0",
    lifespan=lifespan,
)

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

# Register routers
from app.auth.router import router as auth_router
from app.documents.router import router as documents_router
from app.rag.router import router as rag_router

app.include_router(auth_router)
app.include_router(documents_router)
app.include_router(rag_router)


@app.get("/", tags=["Health"])
async def root():
    return {
        "status": "ok",
        "app": "Banking RAG Platform",
        "version": "1.0.0",
        "env": settings.app_env,
    }


@app.get("/health", tags=["Health"])
async def health():
    return {"status": "healthy"}