from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session
from typing import List
from app.db.database import get_db
from app.models.models import Project, Specialty, Contractor
from app.security import get_current_active_user
import app.schemas

router = APIRouter(
    prefix="/projects",
    tags=["Projects"],
    dependencies=[Depends(get_current_active_user)]
)

@router.post("/", response_model=app.schemas.Project)
def create_project(project: app.schemas.ProjectCreate, db: Session = Depends(get_db)):
    db_project = db.query(Project).filter(Project.code == project.code).first()
    if db_project:
        raise HTTPException(status_code=400, detail="Project code already exists")
    
    
    project_data = project.dict(exclude={'specialty_ids', 'contractor_ids'})
    db_project = Project(**project_data)
    
    # Handle Parent Project
    if project.parent_id:
        parent = db.query(Project).filter(Project.id == project.parent_id).first()
        if not parent:
            raise HTTPException(status_code=404, detail="Parent project not found")
    if project.specialty_ids:
        specialties = db.query(Specialty).filter(Specialty.id.in_(project.specialty_ids)).all()
        db_project.specialties = specialties
        
    # Handle Contractors
    if project.contractor_ids:
        contractors = db.query(Contractor).filter(Contractor.id.in_(project.contractor_ids)).all()
        db_project.contractors = contractors

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

@router.get("/", response_model=List[app.schemas.Project])
def read_projects(skip: int = 0, limit: int = 100, db: Session = Depends(get_db)):
    projects = db.query(Project).offset(skip).limit(limit).all()
    return projects

@router.get("/{project_id}", response_model=app.schemas.Project)
def read_project(project_id: int, db: Session = Depends(get_db)):
    db_project = db.query(Project).filter(Project.id == project_id).first()
    if db_project is None:
        raise HTTPException(status_code=404, detail="Project not found")
    return db_project

@router.put("/{project_id}", response_model=app.schemas.Project)
def update_project(project_id: int, project: app.schemas.ProjectCreate, db: Session = Depends(get_db)):
    db_project = db.query(Project).filter(Project.id == project_id).first()
    if db_project is None:
        raise HTTPException(status_code=404, detail="Project not found")
    
    # Update simple fields
    for key, value in project.dict(exclude={'specialty_ids', 'contractor_ids'}).items():
        setattr(db_project, key, value)
    
    # Handle Parent Project
    if project.parent_id is not None:
        parent = db.query(Project).filter(Project.id == project.parent_id).first()
        if not parent and project.parent_id != 0: # Allow 0 or null to clear? Actually null is enough
             raise HTTPException(status_code=404, detail="Parent project not found")
        db_project.parent_id = project.parent_id if project.parent_id != 0 else None
    
    # Update Specialties
    if project.specialty_ids is not None:
        specialties = db.query(Specialty).filter(Specialty.id.in_(project.specialty_ids)).all()
        db_project.specialties = specialties
        
    # Update Contractors
    if project.contractor_ids is not None:
        contractors = db.query(Contractor).filter(Contractor.id.in_(project.contractor_ids)).all()
        db_project.contractors = contractors

    db.commit()
    db.refresh(db_project)
    return db_project

@router.delete("/{project_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_project(project_id: int, db: Session = Depends(get_db)):
    db_project = db.query(Project).filter(Project.id == project_id).first()
    if db_project is None:
        raise HTTPException(status_code=404, detail="Project not found")
    
    db.delete(db_project)
    db.commit()
    return None