"""
Office Management Routes
Admin CRUD for offices and manager-office memberships
"""
from datetime import datetime
from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel
from sqlalchemy.orm import Session
import uuid

from database.connection import get_db
from database.models import Office, User, OfficeMembership
from utils.auth_middleware import require_admin, require_manager_or_admin, get_current_user

router = APIRouter(prefix="/api/offices", tags=["offices"])


# Request/Response Models
class OfficeCreate(BaseModel):
    name: str
    location: str | None = None


class OfficeUpdate(BaseModel):
    name: str | None = None
    location: str | None = None


class OfficeResponse(BaseModel):
    id: str
    name: str
    location: str | None = None
    created_at: str | None

    class Config:
        from_attributes = True


class AddManagerRequest(BaseModel):
    user_id: str


# Office CRUD Routes
@router.get("")
def list_offices(db: Session = Depends(get_db), user=Depends(get_current_user)):
    """List all offices with counts"""
    offices = db.query(Office).all()
    result = []
    for office in offices:
        manager_count = db.query(OfficeMembership).filter(OfficeMembership.office_id == office.id).count()
        employee_count = db.query(User).filter(User.office_id == office.id).count()
        result.append({
            "id": office.id,
            "name": office.name,
            "location": office.location,
            "created_at": office.created_at,
            "manager_count": manager_count,
            "employee_count": employee_count
        })
    return result


@router.get("/{office_id}", response_model=OfficeResponse)
def get_office(office_id: str, db: Session = Depends(get_db), user=Depends(get_current_user)):
    """Get office by ID"""
    office = db.query(Office).filter(Office.id == office_id).first()
    if not office:
        raise HTTPException(status_code=404, detail="Office not found")
    return office


@router.post("", response_model=OfficeResponse)
def create_office(data: OfficeCreate, db: Session = Depends(get_db), user=Depends(require_admin)):
    """Create new office (admin only)"""
    office = Office(
        id=str(uuid.uuid4()),
        name=data.name,
        location=data.location,
        created_at=datetime.utcnow().isoformat()
    )

    db.add(office)
    db.commit()
    db.refresh(office)
    return office


@router.put("/{office_id}", response_model=OfficeResponse)
def update_office(office_id: str, data: OfficeUpdate, db: Session = Depends(get_db), user=Depends(require_admin)):
    """Update office (admin only)"""
    office = db.query(Office).filter(Office.id == office_id).first()
    if not office:
        raise HTTPException(status_code=404, detail="Office not found")

    if data.name is not None:
        office.name = data.name
    if data.location is not None:
        office.location = data.location

    office.updated_at = datetime.utcnow().isoformat()
    db.commit()
    db.refresh(office)
    return office


@router.delete("/{office_id}")
def delete_office(office_id: str, db: Session = Depends(get_db), user=Depends(require_admin)):
    """Delete office (admin only)"""
    office = db.query(Office).filter(Office.id == office_id).first()
    if not office:
        raise HTTPException(status_code=404, detail="Office not found")

    if db.query(User).filter(User.office_id == office_id).count() > 0:
        raise HTTPException(status_code=400, detail="Cannot delete office with assigned users")

    db.delete(office)
    db.commit()
    return {"message": "Office deleted"}


# Office membership routes (linking managers to offices)
@router.get("/{office_id}/managers")
def get_office_managers(office_id: str, db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Get managers for an office"""
    memberships = db.query(OfficeMembership).filter(OfficeMembership.office_id == office_id).all()
    manager_ids = [m.user_id for m in memberships]
    managers = db.query(User).filter(User.id.in_(manager_ids)).all()
    return [{"id": m.id, "name": m.name, "email": m.email} for m in managers]


@router.post("/{office_id}/managers")
def add_office_manager(office_id: str, data: AddManagerRequest, db: Session = Depends(get_db), user=Depends(require_admin)):
    """Add manager to office (admin only)"""
    if not db.query(Office).filter(Office.id == office_id).first():
        raise HTTPException(status_code=404, detail="Office not found")

    manager = db.query(User).filter(User.id == data.user_id).first()
    if not manager:
        raise HTTPException(status_code=404, detail="User not found")
    if manager.role != "manager":
        raise HTTPException(status_code=400, detail="User must have manager role")

    existing = db.query(OfficeMembership).filter(
        OfficeMembership.office_id == office_id,
        OfficeMembership.user_id == data.user_id
    ).first()
    if existing:
        raise HTTPException(status_code=400, detail="Manager already assigned to office")

    membership = OfficeMembership(
        id=str(uuid.uuid4()),
        office_id=office_id,
        user_id=data.user_id,
        created_at=datetime.utcnow().isoformat()
    )
    db.add(membership)
    db.commit()
    return {"message": "Manager added to office"}


@router.delete("/{office_id}/managers/{manager_id}")
def remove_office_manager(office_id: str, manager_id: str, db: Session = Depends(get_db), user=Depends(require_admin)):
    """Remove manager from office (admin only)"""
    membership = db.query(OfficeMembership).filter(
        OfficeMembership.office_id == office_id,
        OfficeMembership.user_id == manager_id
    ).first()
    if not membership:
        raise HTTPException(status_code=404, detail="Manager not assigned to office")

    db.delete(membership)
    db.commit()
    return {"message": "Manager removed from office"}


# Legacy redirect for /api/offices/managers/list -> /api/managers
@router.get("/managers/list")
def list_managers_legacy(db: Session = Depends(get_db), user=Depends(require_manager_or_admin)):
    """Get all managers with their managed offices and parking quota (legacy endpoint)"""
    managers = db.query(User).filter(User.role == "manager").all()
    result = []

    for manager in managers:
        memberships = db.query(OfficeMembership).filter(OfficeMembership.user_id == manager.id).all()
        office_ids = [m.office_id for m in memberships]
        offices = db.query(Office).filter(Office.id.in_(office_ids)).all() if office_ids else []

        result.append({
            "id": manager.id,
            "name": manager.name,
            "email": manager.email,
            "parking_quota": manager.manager_parking_quota or 0,
            "spot_prefix": manager.manager_spot_prefix,
            "offices": [{"id": o.id, "name": o.name} for o in offices]
        })

    return result