"""
GraphRAG Studio — FastAPI Backend
Entry point: uvicorn main:app --host 0.0.0.0 --port 8000 --reload
"""
import os
import sys
from pathlib import Path

# Ensure backend/ is in sys.path for absolute imports
sys.path.insert(0, str(Path(__file__).parent))

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

load_dotenv(Path(__file__).parent / ".env", override=True)

from middleware.auth import get_current_user
from routers import documents, indexing, kg, query, search, system

app = FastAPI(
    title="GraphRAG Studio API",
    description="Multimodal RAG Q&A system backend — MinerU + LangExtract + Agentic-RAG",
    version="1.0.0",
    docs_url="/docs",
    redoc_url="/redoc",
)

# CORS — explicit origins when set, wildcard otherwise.
# Auth uses Bearer headers (not cookies), so credentials are only needed when
# the browser is also sending cookies; keep credentials=False with wildcard to
# avoid the CORS spec rejecting the combo at runtime.
_cors_origins_raw = os.getenv("CORS_ORIGINS", "").strip()
if _cors_origins_raw:
    _cors_origins = [o.strip() for o in _cors_origins_raw.split(",") if o.strip()]
    _cors_credentials = True
else:
    _cors_origins = ["*"]
    _cors_credentials = False

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

# All routers under /api/v1. Each router carries its own sub-prefix.
# documents.router  prefix="/documents" → /api/v1/documents
# indexing.router   prefix="/index"     → /api/v1/index
# kg.router         prefix="/kg"        → /api/v1/kg
# query.router      prefix="/query"     → /api/v1/query
# search.router     prefix="/search"    → /api/v1/search
# system.router     no prefix           → /api/v1/health, /api/v1/system/...
PREFIX = "/api/v1"
_auth = [Depends(get_current_user)]

# Protected routes (require Keycloak authentication)
app.include_router(documents.router, prefix=PREFIX, dependencies=_auth)
app.include_router(indexing.router,  prefix=PREFIX, dependencies=_auth)
app.include_router(kg.router,        prefix=PREFIX, dependencies=_auth)
app.include_router(query.router,     prefix=PREFIX, dependencies=_auth)
app.include_router(search.router,    prefix=PREFIX, dependencies=_auth)

# Public routes (no authentication required)
app.include_router(system.router,    prefix=PREFIX)


@app.get("/")
async def root():
    return {"msg": "GraphRAG Studio API v1.0.0", "docs": "/docs", "health": "/api/v1/health"}


if __name__ == "__main__":
    import uvicorn
    uvicorn.run("main:app", host="0.0.0.0", port=8000, reload=True)