PourInProgressActivity.java

/*
 * Copyright 2014 Bevbot LLC <info@bevbot.com>
 *
 * This file is part of the Kegtab package from the Kegbot project. For
 * more information on Kegtab or Kegbot, see <http://kegbot.org/>.
 *
 * Kegtab is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 2.
 *
 * Kegtab is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with Kegtab. If not, see <http://www.gnu.org/licenses/>.
 */
package org.kegbot.app;

import android.app.ActionBar;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.support.v13.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.ViewFlipper;

import com.google.common.base.Strings;
import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import com.squareup.otto.Subscribe;

import org.kegbot.app.camera.CameraFragment;
import org.kegbot.app.config.AppConfiguration;
import org.kegbot.app.event.FlowUpdateEvent;
import org.kegbot.app.event.PictureDiscardedEvent;
import org.kegbot.app.event.PictureTakenEvent;
import org.kegbot.app.util.ImageDownloader;
import org.kegbot.app.util.Utils;
import org.kegbot.core.AuthenticationManager;
import org.kegbot.core.Flow;
import org.kegbot.core.FlowManager;
import org.kegbot.core.KegbotCore;
import org.kegbot.proto.Models.KegTap;
import org.kegbot.proto.Models.User;

import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;

import javax.annotation.concurrent.GuardedBy;

/**
 * Activity shown while a pour is in progress.
 *
 * @author mike wakerly (opensource@hoho.com)
 */
public class PourInProgressActivity extends CoreActivity {

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

  private static final boolean DEBUG = false;

  /** Delay after a flow has ended, during which a dialog is show. */
  private static final long FLOW_FINISH_DELAY_MILLIS = TimeUnit.SECONDS.toMillis(1);

  /** Minimum idle seconds before a flow is considered idle for display purposes. */
  private static final long IDLE_SCROLL_TIMEOUT_MILLIS = TimeUnit.SECONDS.toMillis(3);

  /** Request code. */
  private static final int REQUEST_AUTH_DRINKER = 100;
  private static final String EXTRA_FLOW_ID = "flow_id";

  private KegbotCore mCore;
  private FlowManager mFlowManager;
  private AppConfiguration mConfig;
  private ImageDownloader mImageDownloader;

  private CameraFragment mCameraFragment;
  private boolean mShowCamera;

  private final Handler mHandler = new Handler(Looper.getMainLooper());

  private PouringTapAdapter mPouringTapAdapter;

  private ViewFlipper mControlsFlipper;
  private Button mClaimPourButton;
  private TextView mDrinkerName;
  private ImageView mDrinkerImage;
  private TextView mShoutText;
  private Button mDoneButton;
  private ViewPager mTapPager;

  private final DialogFragment mIdleDialogFragment = new DialogFragment() {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
      AlertDialog.Builder builder = new AlertDialog.Builder(PourInProgressActivity.this);
      builder.setMessage("Hey, are you still pouring?").setCancelable(false).setPositiveButton(
          "Continue Pouring", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
              for (final Flow flow : mFlowManager.getAllActiveFlows()) {
                flow.pokeActivity();
              }
              dialog.cancel();
            }
          }
      ).setNegativeButton("Done Pouring", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
          for (final Flow flow : mFlowManager.getAllActiveFlows()) {
            mFlowManager.endFlow(flow);
          }
          cancelIdleWarning();
        }
      });
      return builder.create();
    }
  };
  private boolean mIdleDialogShowing = false;

  private final Object mTapsLock = new Object();

  @GuardedBy("mTapsLock")
  private final List<KegTap> mTapList = Lists.newArrayList();

  private Set<Flow> mActiveFlows = Sets.newLinkedHashSet();

  @Subscribe
  public void onPictureTakenEvent(PictureTakenEvent event) {
    final String filename = event.getFilename();
    Log.d(TAG, "Got photo: " + filename);
    for (final Flow flow : mFlowManager.getAllActiveFlows()) {
      Log.d(TAG, "  - attached to flow: " + flow);
      flow.setImage(filename);
    }
  }

  @Subscribe
  public void onPictureDiscardedEvent(PictureDiscardedEvent event) {
    final String filename = event.getFilename();
    Log.d(TAG, "Discarded photo: " + filename);
    for (final Flow flow : mFlowManager.getAllActiveFlows()) {
      if (filename.equals(flow.getImagePath())) {
        flow.removeImage();
      }
    }
  }

  @Subscribe
  public void onFlowUpdateEvent(FlowUpdateEvent event) {
    refreshFlows();
  }

  private final Runnable REFRESH_FLOWS_RUNNABLE = new Runnable() {
    @Override
    public void run() {
      refreshFlows();
      mHandler.postDelayed(this, 1000);
    }
  };

  private final ViewPager.OnPageChangeListener mPageChangeListener = new ViewPager.OnPageChangeListener() {
    @Override
    public void onPageSelected(int position) {
      updateControlsForFlow(getCurrentlyFocusedFlow());
    }

    @Override
    public void onPageScrolled(int arg0, float arg1, int arg2) {
    }

    @Override
    public void onPageScrollStateChanged(int arg0) {
    }
  };

  public class PouringTapAdapter extends FragmentStatePagerAdapter {

    public PouringTapAdapter(FragmentManager fm) {
      super(fm);
    }

    @Override
    public Fragment getItem(int position) {
      final KegTap tap;

      synchronized (mTapsLock) {
        tap = mTapList.get(position);
      }

      final PourStatusFragment frag = PourStatusFragment.forTap(tap);

      final Flow flow = mFlowManager.getFlowForTap(tap);
      if (flow != null) {
        frag.updateWithFlow(flow);
      }
      return frag;
    }

    @Override
    public int getItemPosition(Object object) {
      int index;
      synchronized (mTapsLock) {
        index = mTapList.indexOf(object);
      }
      if (index >= 0) {
        return index;
      }
      return POSITION_NONE;
    }

    @Override
    public int getCount() {
      synchronized (mTapsLock) {
        return mTapList.size();
      }
    }

  }

  public static class PourFinishProgressDialog extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
      ProgressDialog dialog = new ProgressDialog(getActivity());
      dialog.setIndeterminate(true);
      dialog.setCancelable(false);
      dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
      dialog.setMessage("Please wait..");
      dialog.setTitle("Saving drink");
      return dialog;
    }
  }

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    Log.d(TAG, "onCreate()");

    mCore = KegbotCore.getInstance(this);
    mFlowManager = mCore.getFlowManager();
    mConfig = mCore.getConfiguration();
    mImageDownloader = mCore.getImageDownloader();

    final ActionBar actionBar = getActionBar();
    if (actionBar != null) {
      actionBar.hide();
    }
    setContentView(R.layout.pour_in_progress_activity);

    mTapPager = (ViewPager) findViewById(R.id.tapPager);
    mPouringTapAdapter = new PouringTapAdapter(getFragmentManager());
    mTapPager.setAdapter(mPouringTapAdapter);
    mTapPager.setOnPageChangeListener(mPageChangeListener);

    mControlsFlipper = (ViewFlipper) findViewById(R.id.pour_controls_flipper);
    mClaimPourButton = (Button) findViewById(R.id.claimPourButton);
    mDrinkerName = (TextView) findViewById(R.id.pourDrinkerName);
    mDoneButton = (Button) findViewById(R.id.pourEndButton);
    mDrinkerImage = (ImageView) findViewById(R.id.pourDrinkerImage);
    mShoutText = (TextView) findViewById(R.id.shoutText);

    mClaimPourButton.setOnClickListener(new View.OnClickListener() {
      @Override
      public void onClick(View v) {
        final Flow flow = getCurrentlyFocusedFlow();
        if (flow == null || flow.isAuthenticated() || flow.isFinished()) {
          return;
        }

        Log.d(TAG, "Attempting to claim flow id=" + flow.getFlowId());
        final Intent intent = KegtabCommon.getAuthDrinkerActivityIntent(
            PourInProgressActivity.this);
        intent.putExtra(EXTRA_FLOW_ID, flow.getFlowId());
        startActivityForResult(intent, REQUEST_AUTH_DRINKER);
      }
    });

    mDoneButton.setOnClickListener(new OnClickListener() {
      @Override
      public void onClick(View v) {
        final FlowManager flowManager = mCore.getFlowManager();
        final Flow flow = getCurrentlyFocusedFlow();
        if (flow == null) {
          return;
        }
        Log.d(TAG, "Done button pressed, ending flow " + flow.getFlowId());
        flowManager.endFlow(flow);

        // If we're finishing a non-dormant flow, and other dormant flows
        // exist, assume those were started optimistically and finish them
        // now.
        if (flow.getVolumeMl() > 0) {
          final AppConfiguration config = mCore.getConfiguration();
          final long minVolume = config.getMinimumVolumeMl();
          for (final Flow suspectFlow : flowManager.getAllActiveFlows()) {
            if (suspectFlow.getVolumeMl() < minVolume) {
              Log.d(TAG, "Also ending dormant flow: " + suspectFlow.getFlowId());
              flowManager.endFlow(suspectFlow);
            }
          }
        }
      }
    });

    mShoutText = (EditText) findViewById(R.id.shoutText);
    mShoutText.addTextChangedListener(new TextWatcher() {
      @Override
      public void onTextChanged(CharSequence s, int start, int before, int count) {
      }

      @Override
      public void beforeTextChanged(CharSequence s, int start, int count, int after) {
      }

      @Override
      public void afterTextChanged(Editable s) {
        final Flow flow = getCurrentlyFocusedFlow();
        if (flow == null) {
          Log.w(TAG, "Flow went away, dropping shout.");
          return;
        }
        flow.setShout(s.toString());
        flow.pokeActivity();
      }
    });

    mShowCamera = true;
    mCameraFragment = (CameraFragment) getFragmentManager().findFragmentById(R.id.camera);
    if (!mConfig.getUseCamera() || !mConfig.getTakePhotosDuringPour()) {
      mShowCamera = false;
      getFragmentManager().beginTransaction().hide(mCameraFragment).commit();
    }

    refreshFlows();
  }

  /** Returns the currently-focused {@link Flow}, or {@code null}. */
  private Flow getCurrentlyFocusedFlow() {
    synchronized (mTapsLock) {
      final KegTap tap = getCurrentlyFocusedTap();
      if (tap == null) {
        Log.w(TAG, "No current tap, ughuh?!");
        return null;
      }
      return mFlowManager.getFlowForTap(tap);
    }
  }

  /** Returns the currently-focused {@link KegTap}, or {@code null}. */
  private KegTap getCurrentlyFocusedTap() {
    synchronized (mTapsLock) {
      final int currentIndex = mTapPager.getCurrentItem();
      if (currentIndex >= mTapList.size()) {
        return null;
      }
      return mTapList.get(currentIndex);
    }
  }

  private void updateControlsForFlow(Flow flow) {
    if (flow == null) {
      // Tap is inactive.
      mControlsFlipper.setDisplayedChild(0);
      return;
    }

    mControlsFlipper.setDisplayedChild(1);

    if (!mConfig.useAccounts()) {
      mClaimPourButton.setVisibility(View.GONE);
      mShoutText.setVisibility(View.GONE);
      mDrinkerName.setVisibility(View.GONE);
      mDrinkerImage.setVisibility(View.GONE);
    } else {
      boolean imageWasReplaced = false;
      mClaimPourButton.setEnabled(true);

      if (flow.isAnonymous()) {
        mClaimPourButton.setVisibility(View.VISIBLE);
        mDrinkerName.setVisibility(View.GONE);
      } else {
        final String username = flow.getUsername();
        mClaimPourButton.setVisibility(View.GONE);
        mDrinkerName.setVisibility(View.VISIBLE);
        mDrinkerName.setText("Pouring: " + username);

        final AuthenticationManager authManager = mCore.getAuthenticationManager();
        final User user = authManager.getUserDetail(username);
        if (user != null && user.hasImage()) {
          // NOTE(mikey): Use the full-sized image rather than the thumbnail;
          // in many cases the former will already be in the cache from
          // DrinkerSelectActivity.
          final String thumbnailUrl = user.getImage().getThumbnailUrl();
          if (!Strings.isNullOrEmpty(thumbnailUrl)) {
            mImageDownloader.download(thumbnailUrl, mDrinkerImage);
            imageWasReplaced = true;
          }
        } else {
          Log.d(TAG, "No user info.");
        }
      }

      if (!imageWasReplaced) {
        mDrinkerImage.setImageBitmap(null);
        Utils.setBackground(mDrinkerImage, getResources().getDrawable(R.drawable.unknown_drinker));
      }
    }
  }

  @Override
  protected void onStart() {
    super.onStart();
    synchronized (mTapsLock) {
      for (final KegTap tap : mCore.getTapManager().getVisibleTaps()) {
        mTapList.add(tap);
      }
      mPouringTapAdapter.notifyDataSetChanged();
    }
  }

  @Override
  protected void onResume() {
    super.onResume();
    Log.d(TAG, "onResume");
    mCore.getBus().register(this);
    mHandler.post(REFRESH_FLOWS_RUNNABLE);
  }

  @Override
  protected void onPostResume() {
    super.onPostResume();
    final Flow flow = getCurrentlyFocusedFlow();
    Log.d(TAG, "onPostResume: focusedFlow: " + flow);
    if (flow != null) {
      updateControlsForFlow(flow);
      if (Strings.isNullOrEmpty(flow.getImagePath())) {
        if (mShowCamera && mConfig.getEnableAutoTakePhoto()) {
          mCameraFragment.schedulePicture();
        }
      }
    }
  }

  @Override
  protected void onPause() {
    Log.d(TAG, "onPause");
    mHandler.removeCallbacks(REFRESH_FLOWS_RUNNABLE);
    mCore.getBus().unregister(this);
    super.onPause();

    if (mConfig.wakeDuringPour()) {
      getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN |
                           WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD |
                           WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED |
                           WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
    }
  }

  @Override
  protected void onStop() {
    if (isFinishing()) {
      endAllFlows();
    }
    mTapList.clear();
    super.onStop();
  }

  @Override
  public void onBackPressed() {
    if (!mFlowManager.getAllActiveFlows().isEmpty()) {
      endAllFlows();
    } else {
      super.onBackPressed();
    }
  }

  @Override
  protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    setIntent(intent);
    refreshFlows();
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    switch (requestCode) {
      case REQUEST_AUTH_DRINKER:
        if (data == null) {
          Log.i(TAG, "No user selected.");
          return;
        }
        String username = data.getStringExtra(
            KegtabCommon.ACTIVITY_AUTH_DRINKER_RESULT_EXTRA_USERNAME);
        if (Strings.isNullOrEmpty(username)) {
          Log.i(TAG, "No user selected.");
          return;
        }
        int flowId = data.getIntExtra(EXTRA_FLOW_ID, 0);
        final Flow flow = mFlowManager.getFlowForFlowId(flowId);
        if (flow == null) {
          Log.w(TAG, "No flow for id " + flowId);
          return;
        }
        Log.i(TAG, "Flow " + flowId + " claimed by: " + username);
        flow.setUsername(username);
        return;
      default:
        super.onActivityResult(requestCode, resultCode, data);
    }
  }

  private KegTap getMostActiveTap() {
    KegTap tap = getCurrentlyFocusedTap();
    long leastIdle = Long.MAX_VALUE;

    for (Flow flow : mFlowManager.getAllActiveFlows()) {
      final KegTap flowTap = flow.getTap();
      if (flowTap != null && flow.getIdleTimeMs() < leastIdle) {
        tap = flowTap;
        leastIdle = flow.getIdleTimeMs();
      }
    }
    return tap;
  }

  private void scrollToMostActiveTap() {
    final Flow currentFlow = getCurrentlyFocusedFlow();

    // Current flow is active; don't scroll.
    if (currentFlow != null && currentFlow.getIdleTimeMs() < IDLE_SCROLL_TIMEOUT_MILLIS) {
      return;
    }

    // Current flow is most active; still don't scroll.
    final KegTap mostActive = getMostActiveTap();
    if (currentFlow != null && mostActive == currentFlow.getTap()) {
      return;
    }

    // No active taps.
    if (mostActive == null) {
      Log.d(TAG, "Could not find an active tap.");
      return;
    }

    // We have a candidate.
    final Flow candidateFlow = mFlowManager.getFlowForTap(mostActive);
    if (candidateFlow != null) {
      final KegTap tap = candidateFlow.getTap();
      synchronized (mTapsLock) {
        final int position = mTapList.indexOf(tap);
        if (position >= 0) {
          scrollToPosition(position);
        }
      }
    }
  }

  private void scrollToPosition(int position) {
    if (position != mTapPager.getCurrentItem()) {
      Log.d(TAG, "scrollToPosition: " + position);
      mTapPager.setCurrentItem(position, true);
    }
  }

  private void refreshFlows() {
    final Set<Flow> activeFlows = Sets.newLinkedHashSet(mFlowManager.getAllActiveFlows());
    mActiveFlows.addAll(activeFlows);
    final Set<Flow> oldFlows = Sets.newLinkedHashSet(Sets.difference(mActiveFlows, activeFlows));
    for (final Flow oldFlow : oldFlows) {
      Log.d(TAG, "Removing inactive flow: " + oldFlow);
      mActiveFlows.remove(oldFlow);
    }

    if (mShowCamera) {
      mCameraFragment.setEnabled(!mActiveFlows.isEmpty());
    }

    if (mActiveFlows.isEmpty()) {
      cancelIdleWarning();
      finish();
      return;
    }

    long largestIdleTime = Long.MIN_VALUE;
    for (final Flow flow : mActiveFlows) {
      if (flow.getTap() == null) {
        continue;
      }

      if (DEBUG) {
        Log.d(TAG, "Refreshing with flow: " + flow);
      }

      final long idleTimeMs = flow.getIdleTimeMs();
      if (idleTimeMs > largestIdleTime) {
        largestIdleTime = idleTimeMs;
      }
    }

    if (largestIdleTime >= mConfig.getIdleWarningMs()) {
      sendIdleWarning();
    } else {
      cancelIdleWarning();
    }

    scrollToMostActiveTap();
  }

  private void endAllFlows() {
    for (final Flow flow : mFlowManager.getAllActiveFlows()) {
      mFlowManager.endFlow(flow);
    }
    cancelIdleWarning();
    if (mShowCamera) {
      mCameraFragment.cancelPendingPicture();
    }
  }

  private void sendIdleWarning() {
    if (mIdleDialogShowing) {
      return;
    }
    mIdleDialogFragment.show(getFragmentManager(), "idle");
    mIdleDialogShowing = true;
  }

  private void cancelIdleWarning() {
    if (mIdleDialogShowing) {
      mIdleDialogFragment.dismiss();
      getFragmentManager().executePendingTransactions();
      mIdleDialogShowing = false;
    }
  }

  public static Intent getStartIntent(Context context) {
    final Intent intent = new Intent(context, PourInProgressActivity.class);
    intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
    intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    return intent;
  }

}