/***
 * Excerpted from "Hello, Android",
 * published by The Pragmatic Bookshelf.
 * Copyrights apply to this code. It may not be used to create training material, 
 * courses, books, articles, and the like. Contact us if you are in doubt.
 * We make no guarantees that this code is fit for any purpose. 
 * Visit http://www.pragmaticprogrammer.com/titles/eband3 for more book information.
 ***/
package com.example.sudoku;

import android.app.Dialog;
import android.content.Context;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;

public class Keypad extends Dialog {

	protected static final String TAG = "Sudoku";

	private final View keys[] = new View[9];
	private View keypad;

	private final int useds[];
	private final PuzzleView puzzleView;

	public Keypad(Context context, int useds[], PuzzleView puzzleView) {
		super(context);
		this.useds = useds;
		this.puzzleView = puzzleView;
	}

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

		setTitle(R.string.keypad_title);
		setContentView(R.layout.keypad);
		findViews();
		for (int element : useds) {
			if (element != 0)
				keys[element - 1].setVisibility(View.INVISIBLE);
		}
		setListeners();
	}

	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		int tile = 0;
		switch (keyCode) {
		case KeyEvent.KEYCODE_0:
		case KeyEvent.KEYCODE_SPACE:
			tile = 0;
			break;
		case KeyEvent.KEYCODE_1:
			tile = 1;
			break;
		case KeyEvent.KEYCODE_2:
			tile = 2;
			break;
		case KeyEvent.KEYCODE_3:
			tile = 3;
			break;
		case KeyEvent.KEYCODE_4:
			tile = 4;
			break;
		case KeyEvent.KEYCODE_5:
			tile = 5;
			break;
		case KeyEvent.KEYCODE_6:
			tile = 6;
			break;
		case KeyEvent.KEYCODE_7:
			tile = 7;
			break;
		case KeyEvent.KEYCODE_8:
			tile = 8;
			break;
		case KeyEvent.KEYCODE_9:
			tile = 9;
			break;
		default:
			return super.onKeyDown(keyCode, event);
		}
		if (isValid(tile)) {
			returnResult(tile);
		}
		return true;

	}

	/** Return the chosen tile to the caller */
	private void returnResult(int tile) {
		puzzleView.setSelectedTile(tile);
		dismiss();
	}

	private boolean isValid(int tile) {
		for (int t : useds) {
			if (tile == t)
				return false;
		}
		return true;
	}

	private void findViews() {
		keypad = findViewById(R.id.keypad);
		keys[0] = findViewById(R.id.keypad_1);
		keys[1] = findViewById(R.id.keypad_2);
		keys[2] = findViewById(R.id.keypad_3);
		keys[3] = findViewById(R.id.keypad_4);
		keys[4] = findViewById(R.id.keypad_5);
		keys[5] = findViewById(R.id.keypad_6);
		keys[6] = findViewById(R.id.keypad_7);
		keys[7] = findViewById(R.id.keypad_8);
		keys[8] = findViewById(R.id.keypad_9);
	}

	private void setListeners() {
		for (int i = 0; i < keys.length; i++) {
			final int t = i + 1;
			keys[i].setOnClickListener(new View.OnClickListener() {
				public void onClick(View v) {
					returnResult(t);
				}
			});
		}
		keypad.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				returnResult(0);
			}
		});
	}
}