package com.example.testapp.app;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Spinner;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import android.widget.EditText;
import android.text.TextWatcher;
import android.text.Editable;

public class MainActivity extends ActionBarActivity implements TextWatcher {
    private TextView textResult;
    private EditText inputValue;
    private Spinner spinnerCategories, spinnerValue1, spinnerValue2;
    private Unit[] spinnerTemperatureUnits = {
            new Unit("Celsius", 0),
            new Unit("Kelvin", 0),
            new Unit("Fahrenheit", 0)
    };
    private Unit[] spinnerLengthUnits = {
            new Unit("Centimetres", 1),
            new Unit("Millimetres", 0.1f),
            new Unit("Metres", 100),
            new Unit("Kilometres", 100000),
            new Unit("Miles", 160934),
            new Unit("Feet", 30.48f),
            new Unit("Inches", 2.54f)
    };
    private Unit[] spinnerVolumeUnits = {
            new Unit("Litres", 1),
            new Unit("Cubic Meters", 0),
            new Unit("Cubic Kilometres", 0),
            new Unit("Gallons", 3.78541f)
    };
    private Unit[] spinnerWeightUnits = {
            new Unit("Kilos", 1),
            new Unit("Grams", 0.001f),
            new Unit("Tonnes", 1000),
            new Unit("Pounds", 0.453592f)
    };
    private int catNumber, fromNumber, toNumber;

    private void fillList(Spinner spinner, Unit[] list) {
        String[] names = new String[list.length];
        for (int i = 0; i < list.length; i++) names[i] = list[i].getName();
        spinner.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, names));
    }

    private void updateCategory() {
        catNumber = spinnerCategories.getSelectedItemPosition();
        switch (catNumber) {
            case 0: // Temperature
                fillList(spinnerValue1, spinnerTemperatureUnits);
                fillList(spinnerValue2, spinnerTemperatureUnits);
                spinnerValue1.setSelection(0); // Celsius
                spinnerValue2.setSelection(2); // Fahrenheit
                break;
            case 1: // Length
                fillList(spinnerValue1, spinnerLengthUnits);
                fillList(spinnerValue2, spinnerLengthUnits);
                spinnerValue1.setSelection(2); // Metres
                spinnerValue2.setSelection(5); // Feet
                break;
            case 2: // Volume
                fillList(spinnerValue1, spinnerVolumeUnits);
                fillList(spinnerValue2, spinnerVolumeUnits);
                spinnerValue1.setSelection(0); // Litres
                spinnerValue2.setSelection(3); // Gallons
                break;
            case 3: // Weight
                fillList(spinnerValue1, spinnerWeightUnits);
                fillList(spinnerValue2, spinnerWeightUnits);
                spinnerValue1.setSelection(0); // Kilos
                spinnerValue2.setSelection(3); // Pounds
                break;
        }
        updateValues();
    }
    private void updateValues() {
    }

    @Override
    public void afterTextChanged(Editable editable) {
        String inputString = inputValue.getText().toString();
        double result = 0, input = Double.parseDouble(inputString);
        /*fromNumber = spinnerValue1.getSelectedItemPosition();
        toNumber = spinnerValue2.getSelectedItemPosition();
        switch (catNumber) {
            case 1: result = (input * spinnerLengthUnits[fromNumber].getRatio()) / spinnerLengthUnits[toNumber].getRatio(); break;
            case 2: result = (input * spinnerVolumeUnits[fromNumber].getRatio()) / spinnerVolumeUnits[toNumber].getRatio(); break;
            case 3: result = (input * spinnerWeightUnits[fromNumber].getRatio()) / spinnerWeightUnits[toNumber].getRatio(); break;
        }*/
        textResult.setText(Double.toString(input));
    }

    @Override
    public void onTextChanged(CharSequence a, int b, int c, int d) {}

    @Override
    public void beforeTextChanged(CharSequence a, int b, int c, int d) {}

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

        inputValue = (EditText) findViewById(R.id.inputValue);
        textResult = (TextView) findViewById(R.id.textResult);
        spinnerCategories = (Spinner) findViewById(R.id.spinnerCategories);
        spinnerValue1 = (Spinner) findViewById(R.id.spinnerValue1);
        spinnerValue2 = (Spinner) findViewById(R.id.spinnerValue2);

        spinnerCategories.setOnItemSelectedListener(new OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {updateCategory();}
            @Override
            public void onNothingSelected(AdapterView<?> arg0) {}
        });

        spinnerValue1.setOnItemSelectedListener(new OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {updateValues();}
            @Override
            public void onNothingSelected(AdapterView<?> arg0) {}
        });

        spinnerValue2.setOnItemSelectedListener(new OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {updateValues();}
            @Override
            public void onNothingSelected(AdapterView<?> arg0) {}
        });
    }

    @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 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();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

}