from fastapi import APIRouter, Depends, HTTPException, status, Query
from sqlalchemy.orm import Session
from typing import List, Optional
from app.database.config import get_db
from app.models.todo import Todo, PriorityLevel
from app.api.schemas import TodoCreate, TodoResponse, TodoUpdate

router = APIRouter()


@router.post("/", response_model=TodoResponse, status_code=status.HTTP_201_CREATED)
def create_todo(todo: TodoCreate, db: Session = Depends(get_db)):
    """Create a new todo item"""
    db_todo = Todo(**todo.dict())
    db.add(db_todo)
    db.commit()
    db.refresh(db_todo)
    return db_todo


@router.get("/", response_model=List[TodoResponse])
def read_todos(
    skip: int = 0,
    limit: int = 100,
    priority: Optional[PriorityLevel] = Query(
        None, description="Filter todos by priority level"
    ),
    db: Session = Depends(get_db),
):
    """
    Get all todo items with optional filtering by priority

    - **skip**: Number of records to skip
    - **limit**: Maximum number of records to return
    - **priority**: Optional filter by priority level (low, medium, high)
    """
    query = db.query(Todo)

    if priority:
        query = query.filter(Todo.priority == priority)

    todos = query.offset(skip).limit(limit).all()
    return todos


@router.get("/{todo_id}", response_model=TodoResponse)
def read_todo(todo_id: int, db: Session = Depends(get_db)):
    """Get a specific todo item by ID"""
    db_todo = db.query(Todo).filter(Todo.id == todo_id).first()
    if db_todo is None:
        raise HTTPException(status_code=404, detail="Todo not found")
    return db_todo


@router.put("/{todo_id}", response_model=TodoResponse)
def update_todo(todo_id: int, todo: TodoUpdate, db: Session = Depends(get_db)):
    """Update a todo item"""
    db_todo = db.query(Todo).filter(Todo.id == todo_id).first()
    if db_todo is None:
        raise HTTPException(status_code=404, detail="Todo not found")

    update_data = todo.dict(exclude_unset=True)
    for key, value in update_data.items():
        setattr(db_todo, key, value)

    db.commit()
    db.refresh(db_todo)
    return db_todo


@router.delete("/{todo_id}", status_code=status.HTTP_204_NO_CONTENT)
def delete_todo(todo_id: int, db: Session = Depends(get_db)):
    """Delete a todo item"""
    db_todo = db.query(Todo).filter(Todo.id == todo_id).first()
    if db_todo is None:
        raise HTTPException(status_code=404, detail="Todo not found")

    db.delete(db_todo)
    db.commit()
    return None