model

package com.example.todo

import android.app.Application
import android.util.Log
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.LiveData
import androidx.lifecycle.MutableLiveData
import androidx.lifecycle.ViewModel

class Model(application:Application) : AndroidViewModel(application) {
    private val _dataTodo = MutableLiveData<ArrayList<TodoData>>()
            val data : LiveData<ArrayList<TodoData>>
            get()=_dataTodo

    init{
        _dataTodo.value = arrayListOf(
            TodoData(1,"Mencuci",false)
        )
    }

    fun newTodo(newData:String){
        val viewModelVal = _dataTodo.value!!
        var new_id = 0

        if (viewModelVal.size == 0){
            new_id = 0
            Log.d("model","null")
        }else{
            new_id = viewModelVal[viewModelVal.lastIndex].id+1
            Log.d("model","available")
        }
        _dataTodo.value!!.add(TodoData(new_id,newData,false))
        _dataTodo.setValue(_dataTodo.value)
    }

    fun deleteTodo(position:Int){
        if(_dataTodo.value?.size?.compareTo(0) == 1){
            _dataTodo.value!!.removeAt(position)
            _dataTodo.setValue(_dataTodo.value)
        }
    }

    fun updateTodo(position: Int,task:String){
        _dataTodo.value!![position].task = task
        _dataTodo.setValue(_dataTodo.value)
    }
}