package com.noahvogt.miniprojekt;

import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.PopupMenu;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.fragment.app.DialogFragment;


import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.gson.GsonBuilder;
import com.google.gson.reflect.TypeToken;
import com.noahvogt.miniprojekt.DataBase.Message;

import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.lifecycle.ViewModelProvider;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;


import com.google.android.material.navigation.NavigationView;

import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import androidx.work.Data;

import com.chaquo.python.Python;
import com.chaquo.python.android.AndroidPlatform;
import com.google.android.material.snackbar.Snackbar;
import com.noahvogt.miniprojekt.data.CustomAdapter;
import com.noahvogt.miniprojekt.data.EmailViewModel;
import com.noahvogt.miniprojekt.data.MailFunctions;
import com.noahvogt.miniprojekt.workers.DownloadWorker;
import com.noahvogt.miniprojekt.ui.show.MessageShowFragment;
import com.noahvogt.miniprojekt.data.BooleanTypeAdapter;

import java.lang.reflect.Type;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import com.google.gson.Gson;



import static com.noahvogt.miniprojekt.R.id.drawer_layout;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity implements View.OnClickListener, CustomAdapter.SelectedMessage, PopupMenu.OnMenuItemClickListener {

    private AppBarConfiguration mAppBarConfiguration;

    public static final int NEW_WORD_ACTIVITY_REQUEST_CODE = 1;
    public static final String emailData = "Email";
    public static final String passwordData = "Password";
    public static final String nameData = "Name";
    public static EmailViewModel mEmailViewModel;
    public static RecyclerView recyclerView;

    private AlertDialog dialog;
    private EditText newemail_name, newemail_email, newemail_password; /* may not be private */

    SharedPreferences mailServerCredentials;

    /* leave descriptor empty */
    public MainActivity() {}


    public String getVisibleFragment(){
        FragmentManager fragmentManager = MainActivity.this.getSupportFragmentManager();
        List<Fragment> fragments = fragmentManager.getFragments();
        if(fragments != null){
            showToast("not null");
            for(Fragment fragment : fragments){
                showToast(fragment.toString());
                if(fragment.isVisible())
                    showToast("found visible fragment");
                    return "is gallery";
            }
        } else {
            showToast("null");}
            return null;

    }

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

        /* define button listeners */



        /*creates account manager by clicking on profile */
        View accountView = findViewById(R.id.accountView);
        accountView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                /* define View window */
                AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(MainActivity.this);
                final View accountManagerView = getLayoutInflater().inflate(R.layout.account_manager, null);

                AutoCompleteTextView accountSelectorObject =
                        (AutoCompleteTextView) accountManagerView.findViewById(R.id.accountSelectorTextView);

                /* get string data for drop down menu */
                String[] dummyMails = getResources().getStringArray(R.array.dummy_emails);
                ArrayAdapter<String> dropDownAdapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.dropdown_item,
                        R.id.textViewDropDownItem, dummyMails);
                accountSelectorObject.setAdapter(dropDownAdapter);

                /* open View window */
                dialogBuilder.setView(accountManagerView);
                dialog = dialogBuilder.create();
                dialog.show();
            }
        });



        /* invoke toolbar */
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        /* invoke drawer */
        DrawerLayout drawer = findViewById(drawer_layout);
        NavigationView navigationView = findViewById(R.id.nav_view);
        View headerView = navigationView.getHeaderView(0);
        /*
         Passing each menu ID as a set of Ids because each
         menu should be considered as top level destinations.
        */
        mAppBarConfiguration = new AppBarConfiguration.Builder(
                R.id.nav_home, R.id.nav_gallery, R.id.nav_slideshow, R.id.nav_archive, R.id.nav_spam)
                .setDrawerLayout(drawer)
                .build();
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
        NavigationUI.setupWithNavController(navigationView, navController);

        /* Lookup the recyclerview in activity layout */
        recyclerView = findViewById(R.id.recyclerView);

        final CustomAdapter adapter = new CustomAdapter(new CustomAdapter.EmailDiff(),this);



        /* Attach the adapter to the recyclerview to populate items */
        recyclerView.setAdapter(adapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        /* get Inbox Messages in Recyclerviewer at begining is overwritten by Fragments but has to stay*/
        mEmailViewModel = new ViewModelProvider(this).get(EmailViewModel.class);
        mEmailViewModel.getInboxMessage().observe(this, messages -> {
            /* Update the cached copy of the messages in the adapter*/
            adapter.submitList(messages);
        });

        updateNavHeaderText(headerView);

        Button settingButton = findViewById(R.id.settingsButton);
        settingButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent i = new Intent(MainActivity.this, SettingsActivity.class);
                startActivity(i);
            }
        });

        Button add_email_button = (Button) findViewById(R.id.addEmailButton);
        add_email_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                createNewEmailDialog(headerView);
            }
        });

        /* Start email Writer*/
        FloatingActionButton message_create_button = findViewById(R.id.messageButton);
        message_create_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                DialogFragment dialog = MessageCreateFragment.newInstance();
                dialog.show(getSupportFragmentManager(), "tag");

            }
        });

        /* start python instance right on startup */
        if (! Python.isStarted()) {
            Python.start(new AndroidPlatform(this));
        }
    }


    /* gets the data from the Email writer and adds it to the Database */
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, MessageCreateFragment.replyIntent);

        /* Creates class for the Date when Email is written */
        Date dNow = new Date();
        SimpleDateFormat ft =
                new SimpleDateFormat("dd.MM.yy");
        System.out.println(dNow);
        //   if (requestCode == NEW_WORD_ACTIVITY_REQUEST_CODE && resultCode == RESULT_OK) {
        Message word = new Message(
                MessageCreateFragment.replyIntent.getStringExtra(MessageCreateFragment.EXTRA_TO),
                null,
                null,
                MessageCreateFragment.replyIntent.getStringExtra(MessageCreateFragment.EXTRA_FROM),
                ft.format(dNow),
                MessageCreateFragment.replyIntent.getStringExtra(MessageCreateFragment.EXTRA_SUBJECT),
                MessageCreateFragment.replyIntent.getStringExtra(MessageCreateFragment.EXTRA_MESSAGE),
                "Draft",false);
        mEmailViewModel.insert(word);
    }

    /* set nav header name + email to current user data */
    public void updateNavHeaderText(View headerView) {
        mailServerCredentials = getSharedPreferences("Credentials", Context.MODE_PRIVATE);

        TextView navHeaderNameObject = (TextView) headerView.findViewById(R.id.navHeaderName);
        TextView navHeaderEmailObject = (TextView) headerView.findViewById(R.id.navHeaderEmail);

        String startupUser = mailServerCredentials.getString("currentUser","");

        if (!startupUser.isEmpty()) {
            Gson gson = new Gson();

            String startupJsonData = mailServerCredentials.getString("data", "");
            Type credentialsType = new TypeToken<ArrayList<MailServerCredentials>>(){}.getType();
            ArrayList<MailServerCredentials> startupUsersCredentials = gson.fromJson(startupJsonData, credentialsType);

            for (int i = 0; i < startupUsersCredentials.size(); i++) {
                if (startupUsersCredentials.get(i).getUsername().equals(startupUser)) {
                    navHeaderNameObject.setText(startupUser);
                    navHeaderEmailObject.setText(startupUsersCredentials.get(i).getName());
                    break;
                }
            }
        }
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        /* Inflate the menu; this adds items to the action bar if it is present. */
        getMenuInflater().inflate(R.menu.main, menu);

        return true;
    }

    @Override
    public boolean onSupportNavigateUp() {
        NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment);
        return NavigationUI.navigateUp(navController, mAppBarConfiguration)
                || super.onSupportNavigateUp();
    }


    /* better leave empty to avoid any listener disambiguity */
    public void onClick(View view) { }

    public void changeMailServerSettingsDialog(String name, String email, String password, View headerView) {
        /* define View window */
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
        final View changeMailServerSettingsView = getLayoutInflater().inflate(R.layout.mail_credentials_customizer, null);

        /* access objects */
        EditText incomingServerObject = (EditText) changeMailServerSettingsView.findViewById(R.id.custom_mail_server_incoming_server_text);
        EditText outgoingServerObject = (EditText) changeMailServerSettingsView.findViewById(R.id.custom_mail_server_outgoing_server_text);
        EditText incomingPortObject = (EditText) changeMailServerSettingsView.findViewById(R.id.custom_mail_server_incoming_port_text);
        EditText outgoingPortObject = (EditText) changeMailServerSettingsView.findViewById(R.id.custom_mail_server_outgoing_port_text);
        EditText serverUsernameObject = (EditText) changeMailServerSettingsView.findViewById(R.id.custom_mail_server_username_text);
        EditText passwordObject = (EditText) changeMailServerSettingsView.findViewById(R.id.custom_mail_server_password_text);
        Button saveButton = (Button) changeMailServerSettingsView.findViewById(R.id.saveCustomizeButton);
        Button cancelButton = (Button) changeMailServerSettingsView.findViewById(R.id.cancelCustomizeButton);

        /* set assumed input in corresponding fields */
        incomingServerObject.setText(MailFunctions.getImapHostFromEmail(email));
        outgoingServerObject.setText(MailFunctions.getSmtpHostFromEmail(email));
        incomingPortObject.setText("993");
        outgoingPortObject.setText("587");
        serverUsernameObject.setText(email);
        passwordObject.setText(password);

        /* TODO: add save and cancel button functionality */

        /* open View window */
        dialogBuilder.setView(changeMailServerSettingsView);
        dialog = dialogBuilder.create();
        dialog.show();

        saveButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                addNewAccountCredentials(name, serverUsernameObject.getText().toString(), passwordObject.getText().toString(),
                        Integer.parseInt(incomingPortObject.getText().toString()), Integer.parseInt(outgoingPortObject.getText().toString()),
                        incomingServerObject.getText().toString(), outgoingServerObject.getText().toString(), dialog, false,
                        headerView);
            }
        });

        cancelButton.setOnClickListener(v -> dialog.dismiss());
    }

    public void askForChangeMailServerSettingsDialog(String name, String email, String password, View headerView) {
        /* define View window */
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);

        /* open View window */
        dialogBuilder.setTitle("failed to connect :(");
        dialogBuilder
                .setMessage("Do you want to further customize your mail server settings?")
                .setPositiveButton("Yes",new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        /*if this button is clicked, close the whole fragment */
                        changeMailServerSettingsDialog(name, email, password, headerView);
                    }
                })
                .setNegativeButton("No",new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        /* if this button is clicked, close the hole fragment */
                        dialog.dismiss();
                    }
                });
        dialog = dialogBuilder.create();
        dialog.show();
    }

    public static MailServerCredentials newMailServerCredentials;
    public static SharedPreferences.Editor credentialsEditor;

    public void addNewAccountCredentials(String name, String email, String password, int imapPort,
                                         int smtpPort, String imapHost, String smtpHost, DialogInterface dialogContext,
                                         boolean wantConnectionFailedDialog, View headerView) {
        credentialsEditor = mailServerCredentials.edit();

        /* connect to mail server */
        showToast("Probe Connection ...");
        if (MailFunctions.canConnect(MailFunctions.getImapHostFromEmail(email), email, password) == Boolean.TRUE) {
            showToast("was able to connect");

            Gson gson = new Gson();

            /* read login credentials from SharedPreferences */
            SharedPreferences initialCredentialsReader = getSharedPreferences(
                    "Credentials", Context.MODE_PRIVATE);
            String initialReadJsonData = initialCredentialsReader.getString("data", "");
            Type credentialsType = new TypeToken<ArrayList<MailServerCredentials>>(){}.getType();
            ArrayList<MailServerCredentials> allUsersCredentials = gson.fromJson(initialReadJsonData, credentialsType);

            /* check for unique email */
            boolean newEmailIsUnique = true;
            try {
                for (int i = 0; i < allUsersCredentials.size(); i++) {
                    if (allUsersCredentials.get(i).getUsername().equals(email)) {
                        newEmailIsUnique = false;
                        break;
                    }
                }
            } catch (NullPointerException e) {
                System.out.println("creating new arraylist for user credentials, as it seems to be empty");
                allUsersCredentials = new ArrayList<>();
            }

            /* add new email account if the email hasn't been entered before */
            if (newEmailIsUnique) {
                allUsersCredentials.add(new MailServerCredentials(name, email, password, imapHost, smtpHost, imapPort,
                        smtpPort, ""));
                credentialsEditor.putString("data", gson.toJson(allUsersCredentials, credentialsType));
                credentialsEditor.putString("currentUser", email);
                credentialsEditor.apply();
                showToast("Success: added new email account");
                updateNavHeaderText(headerView);
                dialogContext.dismiss();
            } else {
                showToast("Error: cannot add the same email twice");
            }
        } else {
            if (wantConnectionFailedDialog)
                askForChangeMailServerSettingsDialog(name, email, password, headerView);
            else
                showToast("Error: failed to get connection");
        }
    }

    public void createNewEmailDialog(View headerView){
        /* define View window */
        AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(this);
        final View emailPopupView = getLayoutInflater().inflate(R.layout.popup, null);

        /* init text field variables */
        newemail_name = emailPopupView.findViewById(R.id.popup_material_name_asking_text);
        newemail_email = emailPopupView.findViewById(R.id.popup_material_email_asking_text);
        newemail_password = emailPopupView.findViewById(R.id.popup_material_password_asking_text);

        /* init button variables */
        Button newemail_save_button = (Button) emailPopupView.findViewById(R.id.saveButton);
        /* may not be private */
        Button newemail_cancel_button = (Button) emailPopupView.findViewById(R.id.cancelButton);


        /* open View window */
        dialogBuilder.setView(emailPopupView);
        dialog = dialogBuilder.create();
        dialog.show();

        credentialsEditor = mailServerCredentials.edit();

        /* store user input */
        newemail_save_button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                /* store user input */
                String name = newemail_name.getText().toString();
                String email = newemail_email.getText().toString();
                String password = newemail_password.getText().toString();

                /* validate user input before connecting */
                if (!MailFunctions.validateEmail(newemail_email) | !MailFunctions.validateName(newemail_name) |
                        !MailFunctions.validatePassword(newemail_password)) {
                    return;
                }

                addNewAccountCredentials(name, email, password, 993, 587, MailFunctions.getImapHostFromEmail(email),
                        MailFunctions.getSmtpHostFromEmail(email), dialog, true, headerView);
        }});

        newemail_cancel_button.setOnClickListener(v -> dialog.dismiss());
    }

    /* show debug output in  specific view */
    private void showSnackbar(View View, String text) {
        Snackbar.make(View, text, Snackbar.LENGTH_LONG)
                .setAction("Action", null).show();
    }

    /* like showSnackbar(), but global and uglier */
    private void showToast(String text) {
        Toast.makeText(MainActivity.this, text, Toast.LENGTH_SHORT).show();
    }


    @Override
    public void selectedMessage(Message messages, EmailViewModel emailViewModel) {
        DialogFragment dialog = MessageShowFragment.newInstance(messages, mEmailViewModel);
        dialog.show(getSupportFragmentManager(), "tag");

    }

    @Override
    public boolean onMenuItemClick(MenuItem item) {
        switch (item.getItemId()){
            case R.id.action_refresh:

                return true;
        }
        return false;
    }
}