from typing import List, Optional
from fastapi import APIRouter, Depends, HTTPException, status, Request
from sqlalchemy.orm import Session
from datetime import date
from app.api.deps import get_db, get_current_active_user
from app.crud.crud_ppr import ppr as crud_ppr
from app.schemas.ppr import PPR, PPRCreate, PPRUpdate, PPRStatus, PPRStatusUpdate
from app.models.ppr import User

router = APIRouter()


@router.get("/", response_model=List[PPR])
async def get_pprs(
    request: Request,
    skip: int = 0,
    limit: int = 100,
    status: Optional[PPRStatus] = None,
    date_from: Optional[date] = None,
    date_to: Optional[date] = None,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """Get PPR records with optional filtering"""
    pprs = crud_ppr.get_multi(
        db, skip=skip, limit=limit, status=status, 
        date_from=date_from, date_to=date_to
    )
    return pprs


@router.post("/", response_model=PPR)
async def create_ppr(
    request: Request,
    ppr_in: PPRCreate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """Create a new PPR record"""
    ppr = crud_ppr.create(db, obj_in=ppr_in, created_by=current_user.username)
    
    # Send real-time update via WebSocket
    if hasattr(request.app.state, 'connection_manager'):
        await request.app.state.connection_manager.broadcast({
            "type": "ppr_created",
            "data": {
                "id": ppr.id,
                "ac_reg": ppr.ac_reg,
                "status": ppr.status.value
            }
        })
    
    return ppr


@router.get("/{ppr_id}", response_model=PPR)
async def get_ppr(
    ppr_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """Get a specific PPR record"""
    ppr = crud_ppr.get(db, ppr_id=ppr_id)
    if not ppr:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="PPR record not found"
        )
    return ppr


@router.put("/{ppr_id}", response_model=PPR)
async def update_ppr(
    request: Request,
    ppr_id: int,
    ppr_in: PPRUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """Update a PPR record"""
    db_ppr = crud_ppr.get(db, ppr_id=ppr_id)
    if not db_ppr:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="PPR record not found"
        )
    
    ppr = crud_ppr.update(db, db_obj=db_ppr, obj_in=ppr_in)
    
    # Send real-time update
    if hasattr(request.app.state, 'connection_manager'):
        await request.app.state.connection_manager.broadcast({
            "type": "ppr_updated",
            "data": {
                "id": ppr.id,
                "ac_reg": ppr.ac_reg,
                "status": ppr.status.value
            }
        })
    
    return ppr


@router.patch("/{ppr_id}/status", response_model=PPR)
async def update_ppr_status(
    request: Request,
    ppr_id: int,
    status_update: PPRStatusUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """Update PPR status (LANDED, DEPARTED, etc.)"""
    ppr = crud_ppr.update_status(db, ppr_id=ppr_id, status=status_update.status)
    if not ppr:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="PPR record not found"
        )
    
    # Log the status change (you might want to create a journal entry here)
    
    # Send real-time update
    if hasattr(request.app.state, 'connection_manager'):
        await request.app.state.connection_manager.broadcast({
            "type": "status_update",
            "data": {
                "id": ppr.id,
                "ac_reg": ppr.ac_reg,
                "status": ppr.status.value,
                "timestamp": ppr.landed_dt.isoformat() if ppr.landed_dt else None
            }
        })
    
    return ppr


@router.delete("/{ppr_id}", response_model=PPR)
async def delete_ppr(
    request: Request,
    ppr_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """Delete (soft delete) a PPR record"""
    ppr = crud_ppr.delete(db, ppr_id=ppr_id)
    if not ppr:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="PPR record not found"
        )
    
    # Send real-time update
    if hasattr(request.app.state, 'connection_manager'):
        await request.app.state.connection_manager.broadcast({
            "type": "ppr_deleted",
            "data": {
                "id": ppr.id,
                "ac_reg": ppr.ac_reg
            }
        })
    
    return ppr