"""
DRP Backend — FastAPI Application
Main entry point with CORS, routing, and DB initialization.
"""

from fastapi import FastAPI, HTTPException
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse
import os

from database import init_db
from routes.auth import router as auth_router
from routes.journey import router as journey_router
from routes.admin import router as admin_router
from routes.dashboard import router as dashboard_router
from routes.programme import router as programme_router
from routes.field_staff import router as field_staff_router

app = FastAPI(
    title="Gujarat Digital Reading Programme API",
    description="Backend for the DRP prototype — StoryWeaver × Gujarat Government",
    version="2.0.0",
)

# CORS — allow all origins for public demo
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Register routers
app.include_router(auth_router)
app.include_router(journey_router)
app.include_router(admin_router)
app.include_router(dashboard_router)
app.include_router(programme_router)
app.include_router(field_staff_router)

@app.on_event("startup")
def on_startup():
    init_db()

@app.get("/api/health")
def health_check():
    return {"status": "ok"}

# Serve static files from the 'static' directory
# Mount assets first
if os.path.exists("static/assets"):
    app.mount("/assets", StaticFiles(directory="static/assets"), name="assets")

# SPA catch-all for routing
@app.get("/{full_path:path}")
async def serve_spa(full_path: str):
    if full_path.startswith("api"):
        raise HTTPException(status_code=404)
    index_path = os.path.join("static", "index.html")
    if os.path.exists(index_path):
        return FileResponse(index_path)
    return {"message": "Backend is running, but frontend build was not found."}