package com.example.mytodoapp

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.SparseBooleanArray
import android.widget.*

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)


        val itemList = arrayListOf<String>()
        var adapter = ArrayAdapter<String>(this, android.R.layout.simple_list_item_multiple_choice, itemList)

        val bAdd: Button = findViewById(R.id.button_add)
        val bDel: Button = findViewById(R.id.button_delete)
        val bClr: Button = findViewById(R.id.button_clear)
        val eTxt: EditText = findViewById(R.id.editText_todo)
        val lView: ListView = findViewById(R.id.list_todo)

        bAdd.setOnClickListener {
            itemList.add(eTxt.text.toString())
            lView.adapter = adapter
            adapter.notifyDataSetChanged()
            eTxt.text.clear()
            tm("ToDo added to the list!")
        }

        bDel.setOnClickListener {
            val positions: SparseBooleanArray = lView.checkedItemPositions
            var items = lView.count - 1
            while (items > 0) {
                if (positions.get(items)) {
                    adapter.remove(itemList.get(items))
                }
                items--
            }
            positions.clear()
            adapter.notifyDataSetChanged()
            tm("Checked items deleted!")
        }

        bClr.setOnClickListener {
            itemList.clear()
            adapter.notifyDataSetChanged()
            tm("List cleared!")
        }

        lView.setOnItemClickListener { adapterView, view, i, l ->
            tm("Check: -->" + itemList.get(i))
        }

    }

    fun tm(message: String) {
        Toast.makeText(applicationContext, message, Toast.LENGTH_SHORT).show()
    }
}