import time
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from typing import List

from database import get_db
from models.printer import Printer
from schemas.printer import PrinterCreate, PrinterUpdate, PrinterOut
from routers.deps import get_current_user, require_manager, require_sysadmin
from models.user import User
from models.product import Category, Product
from models.table import Table, TableGroup
from services import printer_service
from services.cloud_sync import _sync_once
from middleware.license_check import license_state
from config import settings

router = APIRouter()

_start_time = time.time()


@router.get("/health")
def health():
    return {"status": "ok", "version": settings.VERSION}


@router.get("/status")
def system_status(db: Session = Depends(get_db), user: User = Depends(get_current_user)):
    from datetime import datetime, timezone
    printers = db.query(Printer).filter(Printer.is_active == True).all()
    printer_statuses = []
    for p in printers:
        reachable = printer_service.check_printer(p.ip_address, p.port)
        printer_statuses.append({"id": p.id, "name": p.name, "reachable": reachable})

    licensed = license_state.get("licensed", True)
    locked = license_state.get("locked", False)
    lock_pending = license_state.get("lock_pending", False)
    expires_at = license_state.get("expires_at")
    days_until_expiry = license_state.get("days_until_expiry")
    grace_expires_at = license_state.get("grace_expires_at")

    # Determine lock_reason for the frontend banner logic
    # "admin"   — locked by sysadmin (immediately or deferred)
    # "expired" — license grace period over, site is blocked
    # None      — all good
    lock_reason = None
    if locked or lock_pending:
        lock_reason = "admin"
    elif not licensed:
        lock_reason = "expired"

    # Grace days remaining (only meaningful while in expiry grace period)
    grace_days_remaining = None
    if grace_expires_at:
        try:
            grace_dt = datetime.fromisoformat(grace_expires_at)
            if grace_dt.tzinfo is None:
                grace_dt = grace_dt.replace(tzinfo=timezone.utc)
            grace_days_remaining = max(0, (grace_dt - datetime.now(timezone.utc)).days)
        except ValueError:
            pass

    return {
        "uptime_seconds": int(time.time() - _start_time),
        "version": settings.VERSION,
        "latest_version": license_state.get("latest_version"),
        "licensed": licensed,
        "locked": locked,
        "lock_pending": lock_pending,
        "lock_reason": lock_reason,
        "expires_at": expires_at,
        "days_until_expiry": days_until_expiry,
        "grace_expires_at": grace_expires_at,
        "grace_days_remaining": grace_days_remaining,
        "sync_failed": license_state.get("sync_failed", False),
        "last_sync": license_state.get("last_sync"),
        "waiter_domain": license_state.get("waiter_domain"),
        "printers": printer_statuses,
    }


@router.post("/sync-license")
async def sync_license_now(user: User = Depends(require_manager)):
    """Trigger an immediate cloud heartbeat and return the fresh license state."""
    await _sync_once()
    return {
        "licensed": license_state.get("licensed", True),
        "locked": license_state.get("locked", False),
        "lock_pending": license_state.get("lock_pending", False),
        "lock_reason": (
            "admin" if (license_state.get("locked") or license_state.get("lock_pending"))
            else "expired" if not license_state.get("licensed", True)
            else None
        ),
        "expires_at": license_state.get("expires_at"),
        "days_until_expiry": license_state.get("days_until_expiry"),
        "sync_failed": license_state.get("sync_failed", False),
        "last_sync": license_state.get("last_sync"),
    }


@router.get("/printers", response_model=List[PrinterOut])
def list_printers(db: Session = Depends(get_db), user: User = Depends(require_manager)):
    return db.query(Printer).all()


@router.post("/printers", response_model=PrinterOut)
def create_printer(body: PrinterCreate, db: Session = Depends(get_db), user: User = Depends(require_manager)):
    printer = Printer(**body.model_dump())
    db.add(printer)
    db.commit()
    db.refresh(printer)
    return printer


@router.post("/printers/test")
def test_printer(printer_id: int, db: Session = Depends(get_db), user: User = Depends(require_manager)):
    printer = db.query(Printer).filter(Printer.id == printer_id).first()
    if not printer:
        raise HTTPException(status_code=404, detail="Printer not found")
    success, error = printer_service.send_test_print(printer.ip_address, printer.port, printer.name)
    return {"success": success, "error": error}


@router.post("/printers/test-order")
def test_order_print(printer_id: int, db: Session = Depends(get_db), user: User = Depends(require_manager)):
    printer = db.query(Printer).filter(Printer.id == printer_id).first()
    if not printer:
        raise HTTPException(status_code=404, detail="Printer not found")
    success, error = printer_service.send_test_order_print(printer.ip_address, printer.port, db)
    return {"success": success, "error": error}


@router.put("/printers/{printer_id}", response_model=PrinterOut)
def update_printer(printer_id: int, body: PrinterUpdate, db: Session = Depends(get_db), user: User = Depends(require_manager)):
    printer = db.query(Printer).filter(Printer.id == printer_id).first()
    if not printer:
        raise HTTPException(status_code=404, detail="Printer not found")
    for field, value in body.model_dump(exclude_none=True).items():
        setattr(printer, field, value)
    db.commit()
    db.refresh(printer)
    return printer


@router.delete("/printers/{printer_id}")
def delete_printer(printer_id: int, db: Session = Depends(get_db), user: User = Depends(require_manager)):
    printer = db.query(Printer).filter(Printer.id == printer_id).first()
    if not printer:
        raise HTTPException(status_code=404, detail="Printer not found")
    db.delete(printer)
    db.commit()
    return {"ok": True}


@router.get("/stats")
def system_stats(db: Session = Depends(get_db), user: User = Depends(get_current_user)):
    return {
        "categories": db.query(Category).count(),
        "products": db.query(Product).filter(Product.lifecycle_status == "active").count(),
        "tables": db.query(Table).filter(Table.is_active == True).count(),
        "table_groups": db.query(TableGroup).count(),
        "managers": db.query(User).filter(User.role == "manager", User.is_active == True).count(),
        "waiters": db.query(User).filter(User.role == "waiter", User.is_active == True).count(),
    }


@router.post("/lock")
def lock_system(token: str, user: User = Depends(require_sysadmin)):
    license_state["locked"] = True
    return {"status": "locked"}


@router.post("/unlock")
def unlock_system(token: str, user: User = Depends(require_sysadmin)):
    license_state["locked"] = False
    return {"status": "unlocked"}