from contextlib import asynccontextmanager
import uuid
from fastapi import FastAPI, WebSocket, WebSocketDisconnect, Query, HTTPException, status
from fastapi.middleware.cors import CORSMiddleware
from fastapi.staticfiles import StaticFiles
from pathlib import Path

from app.config import settings
from app.database import engine, Base
from app.core.websocket import manager as ws_manager
from app.core.middleware import TenantContextMiddleware

# Import routers from domain locations
from app.domains.auth.router import router as auth_router
from app.domains.imports.router import uploads_router, templates_router
from app.domains.orders.router import orders_router, order_items_router
from app.domains.admin.router import admin_router, analytics_router, worker_router
from app.domains.products.router import products_router, cad_router
from app.domains.materials.router import router as materials_router
from app.domains.rendering.router import render_templates_router, output_types_router
from app.domains.notifications.router import router as notifications_router
from app.domains.billing.router import pricing_router, invoice_router
from app.domains.tenants.router import router as tenants_router
from app.domains.rendering.workflow_router import router as workflows_router
from app.domains.media.router import router as media_router
from app.api.routers.asset_libraries import router as asset_libraries_router
from app.domains.admin.dashboard_router import router as dashboard_router
from app.api.routers.task_logs import router as task_logs_router


@asynccontextmanager
async def lifespan(app: FastAPI):
    # Create upload directories
    for subdir in ("step_files", "excel_files", "thumbnails", "renders", "blend-templates"):
        Path(settings.upload_dir, subdir).mkdir(parents=True, exist_ok=True)
    # Start WebSocket Redis subscriber
    await ws_manager.start_redis_subscriber()
    yield
    await ws_manager.stop()


app = FastAPI(
    title="Schaeffler Automat API",
    version="0.1.0",
    description="Media-creation pipeline for Schaeffler CAD/bearing product orders",
    lifespan=lifespan,
)

app.add_middleware(
    CORSMiddleware,
    allow_origins=["http://localhost:5173", "http://localhost:3000", "http://frontend:5173", "http://localhost:8888"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)
app.add_middleware(TenantContextMiddleware)

# Mount static files for thumbnails (dir created in lifespan; skip if not writable)
thumbnails_dir = Path(settings.upload_dir) / "thumbnails"
try:
    thumbnails_dir.mkdir(parents=True, exist_ok=True)
    app.mount("/thumbnails", StaticFiles(directory=str(thumbnails_dir)), name="thumbnails")
except (PermissionError, OSError):
    pass  # Running outside Docker without upload dir — thumbnails won't be served statically

# Mount static files for renders
renders_dir = Path(settings.upload_dir) / "renders"
try:
    renders_dir.mkdir(parents=True, exist_ok=True)
    app.mount("/renders", StaticFiles(directory=str(renders_dir)), name="renders")
except (PermissionError, OSError):
    pass

# Include routers (via domain locations)
app.include_router(auth_router, prefix="/api")
app.include_router(uploads_router, prefix="/api")
app.include_router(orders_router, prefix="/api")
app.include_router(templates_router, prefix="/api")
app.include_router(admin_router, prefix="/api")
app.include_router(order_items_router, prefix="/api")
app.include_router(cad_router, prefix="/api")
app.include_router(materials_router, prefix="/api")
app.include_router(worker_router, prefix="/api")
app.include_router(analytics_router, prefix="/api")
app.include_router(pricing_router, prefix="/api")
app.include_router(invoice_router, prefix="/api")
app.include_router(products_router, prefix="/api")
app.include_router(output_types_router, prefix="/api")
app.include_router(render_templates_router, prefix="/api")
app.include_router(notifications_router, prefix="/api")
app.include_router(tenants_router, prefix="/api")
app.include_router(workflows_router)
app.include_router(media_router)
app.include_router(asset_libraries_router, prefix="/api")
app.include_router(dashboard_router, prefix="/api")
app.include_router(task_logs_router, prefix="/api")


@app.get("/health")
async def health():
    return {"status": "ok", "service": "schaefflerautomat-backend"}


@app.websocket("/api/ws")
async def websocket_endpoint(
    websocket: WebSocket,
    token: str = Query(..., description="JWT access token"),
):
    """WebSocket endpoint for real-time events.

    Clients connect with ?token=<jwt>. Events are scoped by tenant_id.
    """
    from app.utils.auth import decode_token
    from app.database import AsyncSessionLocal
    from sqlalchemy import select
    from app.models.user import User

    # Authenticate via token query param (WS cannot send Authorization header)
    try:
        payload = decode_token(token)
        user_id = payload.get("sub")
        if not user_id:
            await websocket.close(code=4001)
            return
    except HTTPException:
        await websocket.close(code=4001)
        return

    # Load user to get tenant_id
    async with AsyncSessionLocal() as db:
        result = await db.execute(select(User).where(User.id == uuid.UUID(user_id)))
        user = result.scalar_one_or_none()

    if not user or not user.is_active:
        await websocket.close(code=4001)
        return

    tenant_id = str(user.tenant_id) if user.tenant_id else user_id

    await ws_manager.connect(websocket, tenant_id)
    try:
        while True:
            # Keep alive — clients send periodic pings as text
            await websocket.receive_text()
    except WebSocketDisconnect:
        await ws_manager.disconnect(websocket, tenant_id)
    except Exception:
        await ws_manager.disconnect(websocket, tenant_id)