/*
 * Copyright (C) 2017 The Android Open Source Project
 *
 * 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 com.googlecode.android_scripting.activity;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.google.common.collect.Lists;
import com.googlecode.android_scripting.ActivityFlinger;
import com.googlecode.android_scripting.BaseApplication;
import com.googlecode.android_scripting.Constants;
import com.googlecode.android_scripting.Log;
import com.googlecode.android_scripting.R;
import com.googlecode.android_scripting.facade.FacadeConfiguration;
import com.googlecode.android_scripting.rpc.MethodDescriptor;
import com.googlecode.android_scripting.trigger.ScriptTrigger;
import com.googlecode.android_scripting.trigger.Trigger;
import com.googlecode.android_scripting.trigger.TriggerRepository;
import com.googlecode.android_scripting.trigger.TriggerRepository.TriggerRepositoryObserver;

import java.io.File;
import java.util.Collections;
import java.util.List;
import java.util.Map;

public class TriggerManager extends ListActivity {
  private final List<ScriptTrigger> mTriggers = Lists.newArrayList();

  private ScriptTriggerAdapter mAdapter;
  private TriggerRepository mTriggerRepository;

  private static enum ContextMenuId {
    REMOVE;
    public int getId() {
      return ordinal() + Menu.FIRST;
    }
  }

  private static enum MenuId {
    ADD, PREFERENCES, HELP;
    public int getId() {
      return ordinal() + Menu.FIRST;
    }
  }

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    CustomizeWindow.requestCustomTitle(this, "Triggers", R.layout.trigger_manager);
    ScriptTriggerListObserver observer = new ScriptTriggerListObserver();
    mAdapter = new ScriptTriggerAdapter();
    setListAdapter(mAdapter);
    registerForContextMenu(getListView());
    mTriggerRepository = ((BaseApplication) getApplication()).getTriggerRepository();
    mTriggerRepository.bootstrapObserver(observer);
    ActivityFlinger.attachView(getListView(), this);
    ActivityFlinger.attachView(getWindow().getDecorView(), this);
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    menu.add(Menu.NONE, MenuId.ADD.getId(), Menu.NONE, "Add").setIcon(
        android.R.drawable.ic_menu_add);
    menu.add(Menu.NONE, MenuId.PREFERENCES.getId(), Menu.NONE, "Preferences").setIcon(
        android.R.drawable.ic_menu_preferences);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    int itemId = item.getItemId();
    if (itemId == MenuId.PREFERENCES.getId()) {
      startActivity(new Intent(this, Preferences.class));
    } else if (itemId != Menu.NONE) {
      Intent intent = new Intent(this, ScriptPicker.class);
      intent.setAction(Intent.ACTION_PICK);
      startActivityForResult(intent, itemId);
    }
    return true;
  }

  @Override
  public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
    menu.add(Menu.NONE, ContextMenuId.REMOVE.getId(), Menu.NONE, "Remove");
  }

  @Override
  public boolean onContextItemSelected(MenuItem item) {
    AdapterView.AdapterContextMenuInfo info;
    try {
      info = (AdapterView.AdapterContextMenuInfo) item.getMenuInfo();
    } catch (ClassCastException e) {
      Log.e("Bad menuInfo", e);
      return false;
    }

    Trigger trigger = mAdapter.getItem(info.position);
    if (trigger == null) {
      Log.v("No trigger selected.");
      return false;
    }

    if (item.getItemId() == ContextMenuId.REMOVE.getId()) {
      mTriggerRepository.remove(trigger);
    }
    return true;
  }

  @Override
  public void onListItemClick(ListView l, View v, int position, long id) {
    mAdapter.notifyDataSetInvalidated();
  }

  private class ScriptTriggerListObserver implements TriggerRepositoryObserver {

    @Override
    public void onPut(Trigger trigger) {
      mTriggers.add((ScriptTrigger) trigger);
      mAdapter.notifyDataSetInvalidated();
    }

    @Override
    public void onRemove(Trigger trigger) {
      mTriggers.remove(trigger);
      mAdapter.notifyDataSetInvalidated();
    }
  }

  private class ScriptTriggerAdapter extends BaseAdapter {

    @Override
    public int getCount() {
      return mTriggers.size();
    }

    @Override
    public Trigger getItem(int position) {
      return mTriggers.get(position);
    }

    @Override
    public long getItemId(int position) {
      return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
      ScriptTrigger trigger = mTriggers.get(position);
      TextView textView = new TextView(TriggerManager.this);
      textView.setText(trigger.getEventName() + " " + trigger.getScript().getName());
      return textView;
    }
  }

  @Override
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
      final File script = new File(data.getStringExtra(Constants.EXTRA_SCRIPT_PATH));
      if (requestCode == MenuId.ADD.getId()) {
        Map<String, MethodDescriptor> eventMethodDescriptors =
            FacadeConfiguration.collectStartEventMethodDescriptors();
        final List<String> eventNames = Lists.newArrayList(eventMethodDescriptors.keySet());
        Collections.sort(eventNames);
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setItems(eventNames.toArray(new CharSequence[eventNames.size()]),
            new OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int position) {
                mTriggerRepository.put(new ScriptTrigger(eventNames.get(position), script));
              }
            });
        builder.show();
      }
    }
  }

  public void clickCancel(View v) {
    for (Trigger t : mTriggerRepository.getAllTriggers().values()) {
      mTriggerRepository.remove(t);
    }
  }
}