import os
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from fastapi.responses import FileResponse
from contextlib import asynccontextmanager
from app.database import engine, Base
from app import models  # noqa: F401 - registers models with Base.metadata
from app.routers import sources, jobs, executions, backups, settings, dashboard
from backup.scheduler import backup_scheduler

@asynccontextmanager
async def lifespan(app: FastAPI):
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)
    backup_scheduler.start()
    await backup_scheduler.sync_schedules()
    yield
    backup_scheduler.shutdown()

app = FastAPI(
    title="Backup Tool API",
    version="0.1.0",
    lifespan=lifespan
)

app.add_middleware(
    CORSMiddleware,
    allow_origins=os.environ.get("CORS_ORIGINS", "http://localhost:3000").split(","),
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

app.include_router(sources.router)
app.include_router(jobs.router)
app.include_router(executions.router)
app.include_router(backups.router)
app.include_router(settings.router)
app.include_router(dashboard.router)

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

# Static files for production
frontend_dist = os.path.join(os.path.dirname(__file__), "../../frontend/dist")
if os.path.exists(frontend_dist):
    app.mount("/assets", StaticFiles(directory=os.path.join(frontend_dist, "assets")), name="assets")

    @app.get("/{path:path}")
    async def serve_frontend(path: str):
        index_file = os.path.join(frontend_dist, "index.html")
        if os.path.exists(index_file):
            return FileResponse(index_file)
        return {"detail": "Frontend not built"}