/*
 * Copyright (C) 2009 University of Washington
 *
 * 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.
 */

package org.odk.collect.android.activities;

import android.app.ListActivity;
import android.content.ContentUris;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.TextView;

import org.odk.collect.android.R;
import org.odk.collect.android.application.Collect;
import org.odk.collect.android.listeners.DiskSyncListener;
import org.odk.collect.android.provider.FormsProviderAPI.FormsColumns;
import org.odk.collect.android.tasks.DiskSyncTask;
import org.odk.collect.android.utilities.VersionHidingCursorAdapter;

/**
 * Responsible for displaying all the valid forms in the forms directory. Stores the path to selected form for use by
 * {@link MainMenuActivity}.
 *
 * @author Yaw Anokwa (yanokwa@gmail.com)
 * @author Carl Hartung (carlhartung@gmail.com)
 */
public class FormChooserList extends ListActivity implements DiskSyncListener {

  private static final String t = "FormChooserList";
  private static final boolean EXIT = true;
  private static final String syncMsgKey = "syncmsgkey";

  private DiskSyncTask mDiskSyncTask;

  private AlertDialog mAlertDialog;

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

    // must be at the beginning of any activity that can be called from an external intent
    try {
      Collect.createODKDirs();
    } catch (RuntimeException e) {
      createErrorDialog(e.getMessage(), EXIT);
      return;
    }

    setContentView(R.layout.chooser_list_layout);
    setTitle(getString(R.string.app_name) + " > " + getString(R.string.enter_data));

    String sortOrder = FormsColumns.DISPLAY_NAME + " ASC, " + FormsColumns.JR_VERSION + " DESC";
    Cursor c = managedQuery(FormsColumns.CONTENT_URI, null, null, null, sortOrder);

    String[] data = new String[]{
        FormsColumns.DISPLAY_NAME, FormsColumns.DISPLAY_SUBTEXT, FormsColumns.JR_VERSION
    };
    int[] view = new int[]{
        R.id.text1, R.id.text2, R.id.text3
    };

    // render total instance view
    SimpleCursorAdapter instances =
        new VersionHidingCursorAdapter(FormsColumns.JR_VERSION, this, R.layout.two_item, c, data, view);
    setListAdapter(instances);

    if (savedInstanceState != null && savedInstanceState.containsKey(syncMsgKey)) {
      TextView tv = (TextView) findViewById(R.id.status_text);
      tv.setText(savedInstanceState.getString(syncMsgKey));
    }

    // DiskSyncTask checks the disk for any forms not already in the content provider
    // that is, put here by dragging and dropping onto the SDCard
    mDiskSyncTask = (DiskSyncTask) getLastNonConfigurationInstance();
    if (mDiskSyncTask == null) {
      Log.i(t, "Starting new disk sync task");
      mDiskSyncTask = new DiskSyncTask();
      mDiskSyncTask.setDiskSyncListener(this);
      mDiskSyncTask.execute((Void[]) null);
    }
  }


  @Override
  public Object onRetainNonConfigurationInstance() {
    // pass the thread on restart
    return mDiskSyncTask;
  }


  @Override
  protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    TextView tv = (TextView) findViewById(R.id.status_text);
    outState.putString(syncMsgKey, tv.getText().toString());
  }


  /**
   * Stores the path of selected form and finishes.
   */
  @Override
  protected void onListItemClick(ListView listView, View view, int position, long id) {
    // get uri to form
    long idFormsTable = ((SimpleCursorAdapter) getListAdapter()).getItemId(position);
    Uri formUri = ContentUris.withAppendedId(FormsColumns.CONTENT_URI, idFormsTable);

    Collect.getInstance().getActivityLogger().logAction(this, "onListItemClick", formUri.toString());

    String action = getIntent().getAction();
    if (Intent.ACTION_PICK.equals(action)) {
      // caller is waiting on a picked form
      setResult(RESULT_OK, new Intent().setData(formUri));
    } else {
      // caller wants to view/edit a form, so launch formentryactivity
      startActivity(new Intent(Intent.ACTION_EDIT, formUri));
    }

    finish();
  }


  @Override
  protected void onResume() {
    mDiskSyncTask.setDiskSyncListener(this);
    super.onResume();

    if (mDiskSyncTask.getStatus() == AsyncTask.Status.FINISHED) {
      SyncComplete(mDiskSyncTask.getStatusMessage());
    }
  }


  @Override
  protected void onPause() {
    mDiskSyncTask.setDiskSyncListener(null);
    super.onPause();
  }


  @Override
  protected void onStart() {
    super.onStart();
    Collect.getInstance().getActivityLogger().logOnStart(this);
  }

  @Override
  protected void onStop() {
    Collect.getInstance().getActivityLogger().logOnStop(this);
    super.onStop();
  }


  /**
   * Called by DiskSyncTask when the task is finished
   */
  @Override
  public void SyncComplete(String result) {
    Log.i(t, "disk sync task complete");
    TextView tv = (TextView) findViewById(R.id.status_text);
    tv.setText(result);
  }


  /**
   * Creates a dialog with the given message. Will exit the activity when the user preses "ok" if shouldExit is set to
   * true.
   *
   * @param errorMsg
   * @param shouldExit
   */
  private void createErrorDialog(String errorMsg, final boolean shouldExit) {

    Collect.getInstance().getActivityLogger().logAction(this, "createErrorDialog", "show");

    mAlertDialog = new AlertDialog.Builder(this).create();
    mAlertDialog.setMessage(errorMsg);
    DialogInterface.OnClickListener errorListener = new DialogInterface.OnClickListener() {
      @Override
      public void onClick(DialogInterface dialog, int i) {
        switch (i) {
          case DialogInterface.BUTTON_POSITIVE:
            Collect.getInstance().getActivityLogger().logAction(this, "createErrorDialog",
                shouldExit ? "exitApplication" : "OK");
            if (shouldExit) {
              finish();
            }
            break;
        }
      }
    };
    mAlertDialog.setCancelable(false);
    mAlertDialog.setButton(AlertDialog.BUTTON_POSITIVE, getString(R.string.ok), errorListener);
    mAlertDialog.show();
  }

}
