package com.whatamidoingwithmylife.splitbill;

import android.app.Activity;
import android.app.Application;
import android.arch.lifecycle.LifecycleOwner;
import android.arch.lifecycle.Observer;
import android.arch.lifecycle.ViewModel;
import android.arch.lifecycle.ViewModelProviders;
import android.content.Context;
import android.content.Intent;
import android.graphics.Rect;
import android.support.annotation.Nullable;
import android.support.design.widget.TabLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.List;

// This class is the class for the menu activity.
// I hate this class. Passionately.

public class MenuActivity extends AppCompatActivity implements PlaceholderFragment.MenuTitles {
    private static final String TAG = "SplitBill";

    private Toolbar toolbar;
    private String resName;
    public static int ResID;
    // ↑ This here int is static because it needs to
    // be accessed from the fragment, something I
    // struggled to figure out for a good week. It's
    // one of the reasons why I hate this class so much.
    public static int mNumberMenus;

    private SectionsPagerAdapter mSectionsPagerAdapter;
    private TabLayout mTabLayout;
    private ViewPager mViewPager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu);

        mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
        mTabLayout = findViewById(R.id.tabs);
        mViewPager = findViewById(R.id.container);

        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);


        mViewPager.setAdapter(mSectionsPagerAdapter);

        mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(mTabLayout));
        mTabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));

        setResName();
        initActivity();

        FloatingActionButton fab = findViewById(R.id.fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                FragmentManager fm = getSupportFragmentManager();
                YallDoneDialog alertDialog = YallDoneDialog.newInstance("Y'all done?");
                alertDialog.show(fm, "fragment_alert");
            }
        });


        SubMenuViewModel vm = ViewModelProviders.of(this, new SubMenuViewModelFactory(getApplication(), MenuActivity.ResID)).get(SubMenuViewModel.class);
        vm.getmNumberMenus().observe(this, new Observer<String>() {
            @Override
            public void onChanged(@Nullable String s) {
                mNumberMenus = Integer.parseInt(s);
                mSectionsPagerAdapter.notifyDataSetChanged();
            }
        });
    }

    // Remember that static ResID int I declared a method back?
    // This method is responsible for setting it without crashing
    // everything from a NullPointerException. It's also responsible
    // for setting the restaurant name on the activity toolbar.

    public void initActivity(){
        toolbar = findViewById(R.id.toolbar);

        resName = getIntent().getExtras().getString("Name");
        ResID = getIntent().getExtras().getInt("ResID");

        toolbar.setTitle(resName);
    }

    public void onStringReceived(String[] strings) {
        populateTabs(strings);
    }

    public void removeAllTabs() {
        int cnp = mViewPager.getChildCount();
        while (cnp > 1) {
            mSectionsPagerAdapter.destroyItem(mViewPager, cnp - 1, mSectionsPagerAdapter.getItem(cnp - 1));
            mTabLayout.removeTabAt(cnp - 1);
            cnp--;
        }
        mSectionsPagerAdapter.notifyDataSetChanged();
    }

    public void populateTabs(String[] subMenus) {
        for (int i = 0; i < subMenus.length; i++) {
            mTabLayout.addTab(mTabLayout.newTab().setText(subMenus[i]),i);
            Log.d(TAG, "Added " + (subMenus[i]) + " to TabLayout");
        }

        mSectionsPagerAdapter.notifyDataSetChanged();
    }

    public void onBackPressed() {
        FragmentManager fm = getSupportFragmentManager();
        BackDialog alertDialog = BackDialog.newInstance("Go back?");
        alertDialog.setCancelable(false);
        alertDialog.show(fm, "fragment_alert");
    }

    public String getResName() {
        return resName;
    }

    public void setResName() {
        toolbar = findViewById(R.id.toolbar);

        Intent intent = getIntent();
        resName = intent.getStringExtra("Name");
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    /**
     * A {@link FragmentPagerAdapter} that returns a fragment corresponding to
     * one of the sections/tabs/pages.
     */
    public static class SectionsPagerAdapter extends FragmentStatePagerAdapter {

        public SectionsPagerAdapter(FragmentManager fm) {
            super(fm);
        }

        @Override
        public Fragment getItem(int position) {
            return PlaceholderFragment.newInstance(position + 1);
        }

        @Override
        public int getCount() {
            return MenuActivity.mNumberMenus;
        }
    }
}