package ussr.retr.myapplication.fragment

import android.os.Bundle
import androidx.fragment.app.Fragment
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.viewpager2.widget.ViewPager2
import com.google.android.material.tabs.TabLayout
import com.google.android.material.tabs.TabLayoutMediator
import ussr.retr.myapplication.R
import ussr.retr.myapplication.ViewPagerAdapter
import ussr.retr.myapplication.tabs.FirstTab
import ussr.retr.myapplication.tabs.SecondTab
import ussr.retr.myapplication.tabs.ThirdTab

class BlankFragment : Fragment() {

    private var viewPager: ViewPager2? = null
    private var tabs: TabLayout? = null
    private var adapter: VPAdapter? = null
    private var tabLayoutMediator: TabLayoutMediator? = null

    override fun onCreateView(
        inflater: LayoutInflater, container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_blank, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        viewPager = view.findViewById(R.id.tabsViewPager)
        tabs = view.findViewById(R.id.Hometabs)

        val fragmentList = mutableListOf(
            FirstTab(),
            SecondTab(),
            ThirdTab()
        )

        adapter = ViewPagerAdapter(childFragmentManager, viewLifecycleOwner.lifecycle,
        fragmentList)
        viewPager.adapter = adapter!!

        tabLayoutMediator = TabLayoutMediator(tabs, viewPager){ tab, position ->
            when (position){
                0 -> tab.text = "First"
                1 -> tab.text = "Second"
                2 -> tab.text = "Third"
            }
        }
        tabLayoutMediator?.attach()
    }

    override fun onDestroyView() {
        super.onDestroyView()
        tabLayoutMediator?.detach()
        tabLayoutMediator = null
        viewPager.adapter = null
        adapter = null
        viewPager = null
        tabs = null
    }

}