mini-cards/app/src/main/java/com/codigoparallevar/minicards/DeckPreviewActivity.java

package com.codigoparallevar.minicards;

import android.app.Dialog;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;

import com.codigoparallevar.minicards.types.functional.Function;
import com.codigoparallevar.minicards.types.functional.Tuple2;
import com.codigoparallevar.minicards.types.functional.Tuple3;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.widget.Toolbar;

import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.Vector;

import com.programaker.api.ProgramakerApi;

public class DeckPreviewActivity extends ReloadableAppCompatActivity {
    private static final String TOKEN_KEY = "PROGRAMAKER_API_TOKEN";
    private static final String PREFERENCES_NAME = "MINICARDS_PREFERENCES";

    public static final String INTENT = "com.codigoparallevar.minicards.DECK";
    private ListView listView;
    private CardPreviewArrayAdapter cardArrayAdapter;
    private ProgramakerApi ProgramakerApi = new ProgramakerApi();

    protected void openLoginDialog(View view) {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);

        final View loginDialog = (LayoutInflater.from(this)
                .inflate(R.layout.login_dialog_view, null));

        final EditText loginUsernameText = loginDialog.findViewById(R.id.login_username_text);
        final EditText loginPasswordText = loginDialog.findViewById(R.id.login_password_text);
        final Button loginButton = loginDialog.findViewById(R.id.login_dialog_login_button);
        final Button cancelButton = loginDialog.findViewById(R.id.login_dialog_cancel_button);
        final TextView messageLabel = loginDialog.findViewById(R.id.login_message_label);

        builder.setTitle("Login").setView(loginDialog);
        final Dialog dialog = builder.create();
        dialog.show();

        cancelButton.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                dialog.cancel();
            }
        });

        final TextWatcher watcher = (new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {}

            @Override
            public void afterTextChanged(Editable s) {
                if ((messageLabel.getVisibility() != View.VISIBLE) &&
                        (loginUsernameText.getText().length() > 0) &&
                        (loginPasswordText.getText().length() > 0)) {
                    loginButton.setEnabled(true);
                } else {
                    loginButton.setEnabled(false);
                }
            }
        });

        loginButton.setEnabled(false);
        loginUsernameText.addTextChangedListener(watcher);
        loginPasswordText.addTextChangedListener(watcher);

        loginButton.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v) {
                messageLabel.setVisibility(View.VISIBLE);
                messageLabel.setText(R.string.loading);
                new CheckLogin().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
                        new Tuple3<>(
                                loginUsernameText.getText().toString(),
                                loginPasswordText.getText().toString(),
                                new Function<String>() {
                                    public void apply(String token) {
                                        if (token == null) {
                                            messageLabel.setText(R.string.invalid_user_pass);
                                        } else {
                                            DeckPreviewActivity.this.setToken(token);
                                            final Button loginToProgramakerButton = findViewById(R.id.login_in_programaker_button);

                                            loginToProgramakerButton.setVisibility(View.GONE);
                                            // Re-check... just in case
                                            new CheckNeededLoginButton().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
                                                    new Tuple2<>(DeckPreviewActivity.this.ProgramakerApi,
                                                            loginToProgramakerButton));
                                            dialog.cancel();
                                        }
                                    }
                                }));
            }
        });
    }

    private void setToken(String token) {
        SharedPreferences preferences = getSharedPreferences(PREFERENCES_NAME, MODE_PRIVATE);
        SharedPreferences.Editor edit = preferences.edit();

        edit.putString(TOKEN_KEY, token);
        edit.commit();

        this.ProgramakerApi.setToken(token);
    }

    private String getToken() {
        SharedPreferences preferences = getSharedPreferences(PREFERENCES_NAME, MODE_PRIVATE);
        if (!preferences.contains(TOKEN_KEY)) {
            return null;
        }
        else {
            return preferences.getString(TOKEN_KEY, null);
        }
    }

    static class CheckLogin extends  AsyncTask<Tuple3<String, String, Function<String>>,
            Void, Tuple2<String, Function<String>>>{
        @Override
        protected Tuple2<String, Function<String>> doInBackground(Tuple3<String, String, Function<String>>... tuples) {
            ProgramakerApi api = new ProgramakerApi();
            boolean logged = false;
            String token = null;
            try {
                token = api.login(tuples[0]._x, tuples[0]._y);
            }
            catch (Exception e) {
                Log.e("Login to PrograMaker", e.toString());
            }
            return new Tuple2<String, Function<String>>(token, tuples[0]._z);
        }

        @Override
        protected void onPostExecute(Tuple2<String, Function<String>> result) {
            result.item2.apply(result.item1);
        }
    }

    static class CheckNeededLoginButton extends  AsyncTask<Tuple2<ProgramakerApi, Button>, Void, Tuple2<Boolean, Button>>{
        @Override
        protected Tuple2<Boolean, Button> doInBackground(Tuple2<ProgramakerApi, Button>... tuples) {
            return new Tuple2<>(tuples[0].item1.check(), tuples[0].item2);
        }

        @Override
        protected void onPostExecute(Tuple2<Boolean, Button> result) {
            if (!result.item1) {
                result.item2.setVisibility(View.VISIBLE);
            }
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_deck_preview);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        FloatingActionButton fab = findViewById(R.id.create_new_card_fab);
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                createOpenCardDialog();
            }
        });

        final Button loginButton = findViewById(R.id.login_in_programaker_button);
        loginButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                DeckPreviewActivity.this.openLoginDialog(v);
            }
       });

        listView = findViewById(R.id.card_deck_list);

        String token = getToken();
        if (token == null) {
            loginButton.setVisibility(View.VISIBLE);
        }
        else {
            loginButton.setVisibility(View.GONE);
            this.ProgramakerApi.setToken(token);
            // Double check that is not needed
            new CheckNeededLoginButton().executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR,
                new Tuple2<>(this.ProgramakerApi, loginButton));
        }
    }

    @Override
    protected void onResume() {
        super.onResume();

        reload();
    }

    public void reload() {
        cardArrayAdapter = new CardPreviewArrayAdapter(this, listAvailableCards());

        listView.setAdapter(cardArrayAdapter);
    }

    private void createOpenCardDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);

        final View openCardOptions = (LayoutInflater.from(this)
                .inflate(R.layout.create_new_card_view, null));

        final EditText cardNameEditText = openCardOptions.findViewById(R.id.card_name_edit_text);

        builder.setTitle("Create a new card")
                .setView(openCardOptions)
                .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                    }
                })
                .setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        CardFile cardfile = new CardFile(CardFile.getDefaultCardStorage(DeckPreviewActivity.this));
                        cardfile.setName(cardNameEditText.getText().toString());
                        cardfile.setBackgroundColor(CardFile.DEFAULT_BACKGROUND_COLOR);

                        try {
                            cardfile.save(DeckPreviewActivity.this);
                        } catch (IOException e) {
                            Log.e("Minicards DeckPreview", "Error creating card "+ e, e);
                            Toast.makeText(DeckPreviewActivity.this,
                                    "Error creating card " + e,
                                    Toast.LENGTH_LONG).show();
                            return;
                        }

                        CardActivity.openCard(DeckPreviewActivity.this, cardfile,
                                CardActivity.DEVELOPER_VISUALIZATION_MODE);
                    }
                });

        Dialog dialog = builder.create();
        dialog.show();
    }

    private PreviewCard[] listAvailableCards() {
        String cardsPath = CardFile.getDefaultCardStorage(this);
        File cardsDir = new File(cardsPath);
        if (!cardsDir.exists()) {
            cardsDir.mkdir();
        }

        File[] cardFiles = cardsDir.listFiles();
        if (cardFiles.length == 0){
            try {
                CardFile.createDefaultCards(cardsDir);
            } catch (IOException e) {
                Log.e("Minicards Deck preview",
                        "IOException when creating default cards", e);
            }
            cardFiles = cardsDir.listFiles();
        }

        List<PreviewCard> cards = new Vector<>(cardFiles.length);
        for (File cardFile : cardFiles) {
            try {
                CardFile card = CardFile.load(cardFile.getAbsolutePath(), new StubPartGrid());
                cards.add(new PreviewCard(card.getName(), card.getBackgroundColor(), card.getPath()));
            } catch (ErrorLoadingCardException e) {
                Log.e("Minicards Deck preview",
                        "Error loading card, [reason=" + e.getReason()
                                + "; path=" + cardFile.getAbsolutePath(),
                        e);
            } catch (IOException e) {
                Log.e("Minicards Deck preview",
                        "IOException loading card, [msg=" + e.getMessage()
                                + "; path=" + cardFile.getAbsolutePath(),
                        e);
            }
        }

        return cards.toArray(new PreviewCard[cards.size()]);
    }
}