package protect.card_locker;


import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;

import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;


public class LoyaltyCardViewActivity extends AppCompatActivity
{
    private static final String TAG = "CardLocker";

    // These are all the barcode types that the zxing library
    // is able to generate a barcode for, and thus should be
    // the only barcodes which we should attempt to scan.
    Collection<String> supportedBarcodeTypes = Collections.unmodifiableList(Arrays.asList(
            BarcodeFormat.AZTEC.name(),
            BarcodeFormat.CODE_39.name(),
            BarcodeFormat.CODE_128.name(),
            BarcodeFormat.CODABAR.name(),
            BarcodeFormat.DATA_MATRIX.name(),
            BarcodeFormat.EAN_8.name(),
            BarcodeFormat.EAN_13.name(),
            BarcodeFormat.ITF.name(),
            BarcodeFormat.PDF_417.name(),
            BarcodeFormat.QR_CODE.name(),
            BarcodeFormat.UPC_A.name()
    ));

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.loyalty_card_view_activity);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        ActionBar actionBar = getSupportActionBar();
        if(actionBar != null)
        {
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
    }

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

        final Bundle b = getIntent().getExtras();
        final int loyaltyCardId = b != null ? b.getInt("id") : 0;
        final boolean updateLoyaltyCard = b != null && b.getBoolean("update", false);
        final boolean viewLoyaltyCard = b != null && b.getBoolean("view", false);

        Log.i(TAG, "To view card: " + loyaltyCardId);

        final EditText storeField = (EditText) findViewById(R.id.storeName);
        final EditText noteField = (EditText) findViewById(R.id.note);
        final EditText cardIdField = (EditText) findViewById(R.id.cardId);
        final EditText barcodeTypeField = (EditText) findViewById(R.id.barcodeType);
        final ImageView barcodeImage = (ImageView) findViewById(R.id.barcode);
        final View barcodeIdLayout = findViewById(R.id.barcodeIdLayout);
        final View barcodeTypeLayout = findViewById(R.id.barcodeTypeLayout);
        final View barcodeImageLayout = findViewById(R.id.barcodeLayout);
        final View barcodeCaptureLayout = findViewById(R.id.barcodeCaptureLayout);

        final Button captureButton = (Button) findViewById(R.id.captureButton);
        final Button saveButton = (Button) findViewById(R.id.saveButton);
        final Button cancelButton = (Button) findViewById(R.id.cancelButton);

        final DBHelper db = new DBHelper(this);

        if(updateLoyaltyCard || viewLoyaltyCard)
        {
            final LoyaltyCard loyaltyCard = db.getLoyaltyCard(loyaltyCardId);

            if(storeField.getText().length() == 0)
            {
                storeField.setText(loyaltyCard.store);
            }

            if(noteField.getText().length() == 0)
            {
                noteField.setText(loyaltyCard.note);
            }

            if(cardIdField.getText().length() == 0)
            {
                cardIdField.setText(loyaltyCard.cardId);
            }

            if(barcodeTypeField.getText().length() == 0)
            {
                barcodeTypeField.setText(loyaltyCard.barcodeType);
            }

            if(viewLoyaltyCard)
            {
                storeField.setEnabled(false);
                noteField.setEnabled(false);
            }

            if(updateLoyaltyCard)
            {
                setTitle(R.string.editCardTitle);
            }
            else
            {
                barcodeCaptureLayout.setVisibility(View.GONE);
                captureButton.setVisibility(View.GONE);
                saveButton.setVisibility(View.GONE);
                cancelButton.setVisibility(View.GONE);
                setTitle(R.string.viewCardTitle);
            }
        }
        else
        {
            setTitle(R.string.addCardTitle);
        }

        if(cardIdField.getText().length() == 0)
        {
            barcodeIdLayout.setVisibility(View.GONE);
        }

        barcodeTypeLayout.setVisibility(View.GONE);

        if(cardIdField.getText().length() > 0 && barcodeTypeField.getText().length() > 0)
        {
            MultiFormatWriter writer = new MultiFormatWriter();
            BitMatrix result;
            try
            {
                String formatString = barcodeTypeField.getText().toString();
                BarcodeFormat format = BarcodeFormat.valueOf(formatString);
                if(format == null)
                {
                    throw new IllegalArgumentException("Unrecognized barcode format: " + formatString);
                }

                int generateWidth = 100;
                int generateHeight = 100;

                String cardIdString = cardIdField.getText().toString();

                Log.i(TAG, "Card: " + cardIdString);

                result = writer.encode(cardIdString, format, generateWidth, generateHeight, null);

                final int WHITE = 0xFFFFFFFF;
                final int BLACK = 0xFF000000;

                int width = result.getWidth();
                int height = result.getHeight();
                int[] pixels = new int[width * height];
                for (int y = 0; y < height; y++)
                {
                    int offset = y * width;
                    for (int x = 0; x < width; x++)
                    {
                        pixels[offset + x] = result.get(x, y) ? BLACK : WHITE;
                    }
                }
                Bitmap bitmap = Bitmap.createBitmap(width, height,
                        Bitmap.Config.ARGB_8888);
                bitmap.setPixels(pixels, 0, width, 0, 0, width, height);
                barcodeImage.setImageBitmap(bitmap);

                barcodeIdLayout.setVisibility(View.VISIBLE);
                barcodeImageLayout.setVisibility(View.VISIBLE);
            }
            catch (WriterException | IllegalArgumentException e)
            {
                Log.e(TAG, "Failed to generate barcode", e);
            }
        }

        View.OnClickListener captureCallback = new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                IntentIntegrator integrator = new IntentIntegrator(LoyaltyCardViewActivity.this);
                integrator.setDesiredBarcodeFormats(supportedBarcodeTypes);

                String prompt = getResources().getString(R.string.scanCardBarcode);
                integrator.setPrompt(prompt);
                integrator.initiateScan();
            }
        };

        captureButton.setOnClickListener(captureCallback);

        saveButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(final View v)
            {
                String store = storeField.getText().toString();
                String note = noteField.getText().toString();
                String cardId = cardIdField.getText().toString();
                String barcodeType = barcodeTypeField.getText().toString();

                if(store.isEmpty())
                {
                    Snackbar.make(v, R.string.noStoreError, Snackbar.LENGTH_LONG).show();
                    return;
                }

                if(cardId.isEmpty() || barcodeType.isEmpty())
                {
                    Snackbar.make(v, R.string.noCardIdError, Snackbar.LENGTH_LONG).show();
                    return;
                }

                if(updateLoyaltyCard)
                {
                    db.updateLoyaltyCard(loyaltyCardId, store, note, cardId, barcodeType);
                    Log.i(TAG, "Updated " + loyaltyCardId + " to " + cardId);
                }
                else
                {
                    db.insertLoyaltyCard(store, note, cardId, barcodeType);
                }

                finish();
            }
        });

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

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        final Bundle b = getIntent().getExtras();
        final boolean updateLoyaltyCard = b != null && b.getBoolean("update", false);
        final boolean viewLoyaltyCard = b != null && b.getBoolean("view", false);

        if(viewLoyaltyCard)
        {
            getMenuInflater().inflate(R.menu.card_edit_menu, menu);
        }
        else if(updateLoyaltyCard)
        {
            getMenuInflater().inflate(R.menu.card_delete_menu, menu);
        }

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item)
    {
        int id = item.getItemId();

        final Bundle b = getIntent().getExtras();
        final int loyaltyCardId = b != null ? b.getInt("id") : 0;

        switch(id)
        {
            case R.id.action_delete:
                Log.e(TAG, "Deleting card: " + loyaltyCardId);

                DBHelper db = new DBHelper(this);
                db.deleteLoyaltyCard(loyaltyCardId);
                finish();
                return true;
            case R.id.action_edit:
                Intent intent = new Intent(getApplicationContext(), LoyaltyCardViewActivity.class);
                Bundle bundle = new Bundle();
                bundle.putInt("id", loyaltyCardId);
                bundle.putBoolean("update", true);
                intent.putExtras(bundle);
                startActivity(intent);
                finish();
                return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent intent)
    {
        IntentResult result =
                IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
        if (result != null)
        {
            String contents = result.getContents();
            String format = result.getFormatName();
            if(contents != null && contents.isEmpty() == false &&
                    format != null && format.isEmpty() == false)
            {
                Log.i(TAG, "Read Contents from scan: " + contents);
                Log.i(TAG, "Read Format: " + format);

                final EditText cardIdField = (EditText) findViewById(R.id.cardId);
                cardIdField.setText(contents);
                final EditText barcodeTypeField = (EditText) findViewById(R.id.barcodeType);
                barcodeTypeField.setText(format);
                onResume();
            }
        }
    }
}