/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * 履歴:
 * NO 日付 更新者 内容
 * 1 2013/10/07 urushibaray 詳細情報を表示しないようにしました。
 * 2 2013/10/07 urushibaray 履歴画面を削除しました。
 * 3 2013/10/07 urushibaray 共有画面を削除しました。
 * 4 2013/10/07 urushibaray 結果画像とフォーマットを表示しないようにしました。
 * 5 2013/10/08 urushibaray ビープ音を削除しました。
 * 6 2013/10/08 urushibaray ライト機能を削除しました。
 * 7 2013/10/08 urushibaray 設定画面を削除しました。
 * 8 2013/10/08 urushibaray クリップボードのコピーを有効にしました。
 * 9 2013/10/08 urushibaray バルクスキャン機能を削除しました。
 * 10 2013/10/08 urushibaray 初回起動時のヘルプ画面を表示しないようにしました。
 * 11 2013/10/09 urushibaray finalをはずしました。
 * 12 2013/10/09 urushibaray R.javaのパッケージを変更しました。
 * 13 2013/10/09 urushibaray AboutActivityを起動するように変更しました。
 * 14 2013/10/09 urushibaray Intent起動の結果を表示しないようにしました。
 */

package com.google.zxing.client.android;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.Result;
import com.google.zxing.client.android.camera.CameraManager;
import com.google.zxing.client.android.result.ResultButtonListener;
import com.google.zxing.client.android.result.ResultHandler;
import com.google.zxing.client.android.result.ResultHandlerFactory;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.text.ClipboardManager;
import android.util.Log;
import android.util.TypedValue;
import android.view.KeyEvent;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;

import java.io.IOException;
import java.util.Collection;
import java.util.Map;

import jp.gr.java_conf.qr_code.AboutActivity;
import jp.gr.java_conf.qr_code.R;

/**
 * This activity opens the camera and does the actual scanning on a background thread. It draws a
 * viewfinder to help the user place the barcode correctly, shows feedback as the image processing
 * is happening, and then overlays the results when a scan is successful.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 * @author Sean Owen
 */
public class CaptureActivity extends Activity implements SurfaceHolder.Callback {

  private static final String TAG = CaptureActivity.class.getSimpleName();

  private CameraManager cameraManager;
  private CaptureActivityHandler handler;
  private Result savedResultToShow;
  private ViewfinderView viewfinderView;
  private TextView statusView;
  private View resultView;
  private Result lastResult;
  private boolean hasSurface;
  private boolean copyToClipboard;
  private IntentSource source;
  private Collection<BarcodeFormat> decodeFormats;
  private Map<DecodeHintType,?> decodeHints;
  private String characterSet;
  private InactivityTimer inactivityTimer;

  ViewfinderView getViewfinderView() {
    return viewfinderView;
  }

  public Handler getHandler() {
    return handler;
  }

  CameraManager getCameraManager() {
    return cameraManager;
  }

  @Override
  public void onCreate(Bundle icicle) {
    super.onCreate(icicle);

    Window window = getWindow();
    window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    setContentView(R.layout.capture);

    hasSurface = false;
    inactivityTimer = new InactivityTimer(this);
  }

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

    // CameraManager must be initialized here, not in onCreate(). This is necessary because we don't
    // want to open the camera driver and measure the screen size if we're going to show the help on
    // first launch. That led to bugs where the scanning rectangle was the wrong size and partially
    // off screen.
    cameraManager = new CameraManager(getApplication());

    viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view);
    viewfinderView.setCameraManager(cameraManager);

    resultView = findViewById(R.id.result_view);
    statusView = (TextView) findViewById(R.id.status_view);

    handler = null;
    lastResult = null;

    resetStatusView();

    SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
    SurfaceHolder surfaceHolder = surfaceView.getHolder();
    if (hasSurface) {
      // The activity was paused but not stopped, so the surface still exists. Therefore
      // surfaceCreated() won't be called, so init the camera here.
      initCamera(surfaceHolder);
    } else {
      // Install the callback and wait for surfaceCreated() to init the camera.
      surfaceHolder.addCallback(this);
      surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
    }

    inactivityTimer.onResume();

    Intent intent = getIntent();

    copyToClipboard = (intent == null || intent.getBooleanExtra(Intents.Scan.SAVE_HISTORY, true));

    source = IntentSource.NONE;
    decodeFormats = null;
    characterSet = null;

    if (intent != null) {

      String action = intent.getAction();

      if (Intents.Scan.ACTION.equals(action)) {

        // Scan the formats the intent requested, and return the result to the calling activity.
        source = IntentSource.NATIVE_APP_INTENT;
        decodeFormats = DecodeFormatManager.parseDecodeFormats(intent);
        decodeHints = DecodeHintManager.parseDecodeHints(intent);

      }

      characterSet = intent.getStringExtra(Intents.Scan.CHARACTER_SET);

    }
  }

  @Override
  protected void onPause() {
    if (handler != null) {
      handler.quitSynchronously();
      handler = null;
    }
    inactivityTimer.onPause();
    cameraManager.closeDriver();
    if (!hasSurface) {
      SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view);
      SurfaceHolder surfaceHolder = surfaceView.getHolder();
      surfaceHolder.removeCallback(this);
    }
    super.onPause();
  }

  @Override
  protected void onDestroy() {
    inactivityTimer.shutdown();
    super.onDestroy();
  }

  @Override
  public boolean onKeyDown(int keyCode, KeyEvent event) {
    switch (keyCode) {
      case KeyEvent.KEYCODE_BACK:
        if (source == IntentSource.NATIVE_APP_INTENT) {
          setResult(RESULT_CANCELED);
          finish();
          return true;
        }
        if ((source == IntentSource.NONE) && lastResult != null) {
          restartPreviewAfterDelay(0L);
          return true;
        }
        break;
      case KeyEvent.KEYCODE_FOCUS:
      case KeyEvent.KEYCODE_CAMERA:
        // Handle these events so they don't launch the Camera app
        return true;
      // Use volume up/down to turn on light
      case KeyEvent.KEYCODE_VOLUME_DOWN:
        cameraManager.setTorch(false);
        return true;
      case KeyEvent.KEYCODE_VOLUME_UP:
        cameraManager.setTorch(true);
        return true;
    }
    return super.onKeyDown(keyCode, event);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater menuInflater = getMenuInflater();
    menuInflater.inflate(R.menu.capture, menu);
    return super.onCreateOptionsMenu(menu);
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    Intent intent = new Intent(Intent.ACTION_VIEW);
    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
    switch (item.getItemId()) {
      case R.id.menu_help:
        intent.setClassName(this, AboutActivity.class.getName());
        startActivity(intent);
        break;
      default:
        return super.onOptionsItemSelected(item);
    }
    return true;
  }

  private void decodeOrStoreSavedBitmap(Bitmap bitmap, Result result) {
    // Bitmap isn't used yet -- will be used soon
    if (handler == null) {
      savedResultToShow = result;
    } else {
      if (result != null) {
        savedResultToShow = result;
      }
      if (savedResultToShow != null) {
        Message message = Message.obtain(handler, R.id.decode_succeeded, savedResultToShow);
        handler.sendMessage(message);
      }
      savedResultToShow = null;
    }
  }

  @Override
  public void surfaceCreated(SurfaceHolder holder) {
    if (holder == null) {
      Log.e(TAG, "*** WARNING *** surfaceCreated() gave us a null surface!");
    }
    if (!hasSurface) {
      hasSurface = true;
      initCamera(holder);
    }
  }

  @Override
  public void surfaceDestroyed(SurfaceHolder holder) {
    hasSurface = false;
  }

  @Override
  public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {

  }

  /**
   * A valid barcode has been found, so give an indication of success and show the results.
   *
   * @param rawResult The contents of the barcode.
   * @param scaleFactor amount by which thumbnail was scaled
   * @param barcode   A greyscale bitmap of the camera data which was decoded.
   */
  public void handleDecode(Result rawResult, Bitmap barcode, float scaleFactor) {
    inactivityTimer.onActivity();
    lastResult = rawResult;
    ResultHandler resultHandler = ResultHandlerFactory.makeResultHandler(this, rawResult);

    switch (source) {
      case NATIVE_APP_INTENT:
        handleDecodeExternally(rawResult, resultHandler);
        break;
      case NONE:
        handleDecodeInternally(rawResult, resultHandler, barcode);
        break;
    }
  }

  // Put up our own UI for how to handle the decoded contents.
  private void handleDecodeInternally(Result rawResult, ResultHandler resultHandler, Bitmap barcode) {
    statusView.setVisibility(View.GONE);
    viewfinderView.setVisibility(View.GONE);
    resultView.setVisibility(View.VISIBLE);

    TextView contentsTextView = (TextView) findViewById(R.id.contents_text_view);
    CharSequence displayContents = resultHandler.getDisplayContents();
    contentsTextView.setText(displayContents);
    // Crudely scale betweeen 22 and 32 -- bigger font for shorter text
    int scaledSize = Math.max(22, 32 - displayContents.length() / 4);
    contentsTextView.setTextSize(TypedValue.COMPLEX_UNIT_SP, scaledSize);

    int buttonCount = resultHandler.getButtonCount();
    ViewGroup buttonView = (ViewGroup) findViewById(R.id.result_button_view);
    buttonView.requestFocus();
    for (int x = 0; x < ResultHandler.MAX_BUTTON_COUNT; x++) {
      TextView button = (TextView) buttonView.getChildAt(x);
      if (x < buttonCount) {
        button.setVisibility(View.VISIBLE);
        button.setText(resultHandler.getButtonText(x));
        button.setOnClickListener(new ResultButtonListener(resultHandler, x));
      } else {
        button.setVisibility(View.GONE);
      }
    }

    if (copyToClipboard && !resultHandler.areContentsSecure()) {
      ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
      if (displayContents != null) {
        try {
          clipboard.setText(displayContents);
        } catch (NullPointerException npe) {
          // Some kind of bug inside the clipboard implementation, not due to null input
          Log.w(TAG, "Clipboard bug", npe);
        }
      }
    }
  }

  // Briefly show the contents of the barcode, then handle the result outside Barcode Scanner.
  private void handleDecodeExternally(Result rawResult, ResultHandler resultHandler) {

    if (copyToClipboard && !resultHandler.areContentsSecure()) {
      ClipboardManager clipboard = (ClipboardManager) getSystemService(CLIPBOARD_SERVICE);
      CharSequence text = resultHandler.getDisplayContents();
      if (text != null) {
        try {
          clipboard.setText(text);
        } catch (NullPointerException npe) {
          // Some kind of bug inside the clipboard implementation, not due to null input
          Log.w(TAG, "Clipboard bug", npe);
        }
      }
    }

    if (source == IntentSource.NATIVE_APP_INTENT) {
      
      // Hand back whatever action they requested - this can be changed to Intents.Scan.ACTION when
      // the deprecated intent is retired.
      Intent intent = new Intent(getIntent().getAction());
      intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
      intent.putExtra(Intents.Scan.RESULT, rawResult.toString());
      sendReplyMessage(R.id.return_scan_result, intent);
      
    }
  }
  
  private void sendReplyMessage(int id, Object arg) {
    Message message = Message.obtain(handler, id, arg);
    handler.sendMessage(message);
  }

  private void initCamera(SurfaceHolder surfaceHolder) {
    if (surfaceHolder == null) {
      throw new IllegalStateException("No SurfaceHolder provided");
    }
    if (cameraManager.isOpen()) {
      Log.w(TAG, "initCamera() while already open -- late SurfaceView callback?");
      return;
    }
    try {
      cameraManager.openDriver(surfaceHolder);
      // Creating the handler starts the preview, which can also throw a RuntimeException.
      if (handler == null) {
        handler = new CaptureActivityHandler(this, decodeFormats, decodeHints, characterSet, cameraManager);
      }
      decodeOrStoreSavedBitmap(null, null);
    } catch (IOException ioe) {
      Log.w(TAG, ioe);
      displayFrameworkBugMessageAndExit();
    } catch (RuntimeException e) {
      // Barcode Scanner has seen crashes in the wild of this variety:
      // java.?lang.?RuntimeException: Fail to connect to camera service
      Log.w(TAG, "Unexpected error initializing camera", e);
      displayFrameworkBugMessageAndExit();
    }
  }

  private void displayFrameworkBugMessageAndExit() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle(getString(R.string.app_name));
    builder.setMessage(getString(R.string.msg_camera_framework_bug));
    builder.setPositiveButton(R.string.button_ok, new FinishListener(this));
    builder.setOnCancelListener(new FinishListener(this));
    builder.show();
  }

  public void restartPreviewAfterDelay(long delayMS) {
    if (handler != null) {
      handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS);
    }
    resetStatusView();
  }

  private void resetStatusView() {
    resultView.setVisibility(View.GONE);
    statusView.setText(R.string.msg_default_status);
    statusView.setVisibility(View.VISIBLE);
    viewfinderView.setVisibility(View.VISIBLE);
    lastResult = null;
  }

  public void drawViewfinder() {
    viewfinderView.drawViewfinder();
  }
}
