/**
 * Copyright (c) 2012 Todoroo Inc
 *
 * See the file "LICENSE" for the full license governing this code.
 */
package com.todoroo.astrid.activity;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.support.v4.view.MenuItemCompat;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import com.todoroo.andlib.data.Callback;
import com.todoroo.andlib.data.Property;
import com.todoroo.andlib.data.TodorooCursor;
import com.todoroo.andlib.sql.Criterion;
import com.todoroo.andlib.sql.QueryTemplate;
import com.todoroo.astrid.adapter.TaskAdapter;
import com.todoroo.astrid.api.CustomFilter;
import com.todoroo.astrid.api.Filter;
import com.todoroo.astrid.core.BuiltInFilterExposer;
import com.todoroo.astrid.data.Task;
import com.todoroo.astrid.gtasks.GtasksPreferenceService;
import com.todoroo.astrid.service.TaskCreator;
import com.todoroo.astrid.service.TaskDeleter;
import com.todoroo.astrid.service.TaskDuplicator;
import com.todoroo.astrid.timers.TimerPlugin;
import com.todoroo.astrid.voice.VoiceInputAssistant;

import org.tasks.LocalBroadcastManager;
import org.tasks.R;
import org.tasks.activities.FilterSettingsActivity;
import org.tasks.analytics.Tracker;
import org.tasks.analytics.Tracking;
import org.tasks.data.TaskListDataProvider;
import org.tasks.dialogs.DialogBuilder;
import org.tasks.dialogs.SortDialog;
import org.tasks.gtasks.SyncAdapterHelper;
import org.tasks.injection.ForActivity;
import org.tasks.injection.FragmentComponent;
import org.tasks.injection.InjectingFragment;
import org.tasks.preferences.Preferences;
import org.tasks.tasklist.TaskListRecyclerAdapter;
import org.tasks.tasklist.ViewHolderFactory;
import org.tasks.ui.CheckBoxes;
import org.tasks.ui.MenuColorizer;
import org.tasks.ui.ProgressDialogAsyncTask;

import java.util.List;

import javax.inject.Inject;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

import static android.support.v4.content.ContextCompat.getColor;
import static com.todoroo.astrid.voice.VoiceInputAssistant.voiceInputAvailable;

/**
 * Primary activity for the Bente application. Shows a list of upcoming tasks
 * and a user's coaches.
 *
 * @author Tim Su <tim@todoroo.com>
 *
 */
public class TaskListFragment extends InjectingFragment implements
        SwipeRefreshLayout.OnRefreshListener, Toolbar.OnMenuItemClickListener {

    public static TaskListFragment newTaskListFragment(Filter filter) {
        TaskListFragment fragment = new TaskListFragment();
        fragment.filter = filter;
        return fragment;
    }

    private static final String EXTRA_FILTER = "extra_filter";
    private static final String FRAG_TAG_SORT_DIALOG = "frag_tag_sort_dialog";

    public static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;
    private static final int REQUEST_EDIT_FILTER = 11544;

    // --- instance variables

    @Inject SyncAdapterHelper syncAdapterHelper;
    @Inject TaskDeleter taskDeleter;
    @Inject TaskDuplicator taskDuplicator;
    @Inject @ForActivity Context context;
    @Inject Preferences preferences;
    @Inject GtasksPreferenceService gtasksPreferenceService;
    @Inject DialogBuilder dialogBuilder;
    @Inject CheckBoxes checkBoxes;
    @Inject VoiceInputAssistant voiceInputAssistant;
    @Inject TaskCreator taskCreator;
    @Inject protected TaskListDataProvider taskListDataProvider;
    @Inject TimerPlugin timerPlugin;
    @Inject ViewHolderFactory viewHolderFactory;
    @Inject protected Tracker tracker;
    @Inject LocalBroadcastManager localBroadcastManager;

    @BindView(R.id.swipe_layout) SwipeRefreshLayout swipeRefreshLayout;
    @BindView(R.id.swipe_layout_empty) SwipeRefreshLayout emptyRefreshLayout;
    @BindView(R.id.toolbar) Toolbar toolbar;
    @BindView(R.id.task_list_coordinator) CoordinatorLayout coordinatorLayout;
    @BindView(R.id.recycler_view) RecyclerView recyclerView;

    private TaskAdapter taskAdapter = null;
    private TaskListRecyclerAdapter recyclerAdapter;
    private final RefreshReceiver refreshReceiver = new RefreshReceiver();
    private TaskListFragmentCallbackHandler callbacks;

    protected Filter filter;

    /*
     * ======================================================================
     * ======================================================= initialization
     * ======================================================================
     */

    @Override
    public void onRefresh() {
        if (!syncAdapterHelper.initiateManualSync()) {
            refresh();
        }
    }

    protected void setSyncOngoing(final boolean ongoing) {
        Activity activity = getActivity();
        if (activity != null) {
            activity.runOnUiThread(() -> {
                swipeRefreshLayout.setRefreshing(ongoing);
                emptyRefreshLayout.setRefreshing(ongoing);
            });
        }
    }

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

        if (savedInstanceState != null) {
            recyclerAdapter.restoreSaveState(savedInstanceState);
        }
    }

    /**
     * Container Activity must implement this interface and we ensure that it
     * does during the onAttach() callback
     */
    public interface TaskListFragmentCallbackHandler {
        void onTaskListItemClicked(long taskId);

        void onNavigationIconClicked();
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        callbacks = (TaskListFragmentCallbackHandler) activity;
    }

    @Override
    public void inject(FragmentComponent component) {
        component.inject(this);
    }

    /** Called when loading up the activity */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (savedInstanceState != null) {
            filter = savedInstanceState.getParcelable(EXTRA_FILTER);
        }

        if (filter == null) {
            filter = BuiltInFilterExposer.getMyTasksFilter(getResources());
        }

        setTaskAdapter();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);

        outState.putParcelable(EXTRA_FILTER, filter);
        outState.putAll(recyclerAdapter.getSaveState());
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View parent = inflater.inflate(R.layout.fragment_task_list, container, false);
        ButterKnife.bind(this, parent);
        setupRefresh(swipeRefreshLayout);
        setupRefresh(emptyRefreshLayout);

        toolbar.setTitle(filter.listingTitle);
        toolbar.setNavigationIcon(R.drawable.ic_menu_24dp);
        toolbar.setNavigationOnClickListener(v -> callbacks.onNavigationIconClicked());
        inflateMenu(toolbar);
        setupMenu(toolbar.getMenu());
        toolbar.setOnMenuItemClickListener(this);
        MenuColorizer.colorToolbar(context, toolbar);

        return parent;
    }

    protected void inflateMenu(Toolbar toolbar) {
        toolbar.inflateMenu(R.menu.menu_task_list_fragment);
        if (filter instanceof CustomFilter && ((CustomFilter) filter).getId() > 0) {
            toolbar.inflateMenu(R.menu.menu_custom_filter);
        }
    }

    private void setupMenu(Menu menu) {
        MenuItem hidden = menu.findItem(R.id.menu_show_hidden);
        if (preferences.getBoolean(R.string.p_show_hidden_tasks, false)) {
            hidden.setChecked(true);
        }
        MenuItem completed = menu.findItem(R.id.menu_show_completed);
        if (preferences.getBoolean(R.string.p_show_completed_tasks, false)) {
            completed.setChecked(true);
        }
        if (taskAdapter.isManuallySorted()) {
            completed.setChecked(true);
            completed.setEnabled(false);
            hidden.setChecked(true);
            hidden.setEnabled(false);
        }

        menu.findItem(R.id.menu_voice_add).setVisible(voiceInputAvailable(getActivity()));
        final MenuItem item = menu.findItem(R.id.menu_search);
        final SearchView actionView = (SearchView) MenuItemCompat.getActionView(item);
        actionView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {
                query = query.trim();
                String title = getString(R.string.FLA_search_filter, query);
                Filter savedFilter = new Filter(title,
                        new QueryTemplate().where(Criterion.and(
                                        Task.DELETION_DATE.eq(0),
                                        Criterion.or(
                                                Task.NOTES.like("%" + query + "%"),
                                                Task.TITLE.like("%" + query + "%")))));
                ((TaskListActivity) getActivity()).onFilterItemClicked(savedFilter);
                MenuItemCompat.collapseActionView(item);
                return true;
            }

            @Override
            public boolean onQueryTextChange(String query) {
                return false;
            }
        });
    }

    @Override
    public boolean onMenuItemClick(MenuItem item) {
        switch(item.getItemId()) {
            case R.id.menu_voice_add:
                voiceInputAssistant.startVoiceRecognitionActivity(R.string.voice_create_prompt);
                return true;
            case R.id.menu_sort:
                SortDialog.newSortDialog(hasDraggableOption()).show(getChildFragmentManager(), FRAG_TAG_SORT_DIALOG);
                return true;
            case R.id.menu_show_hidden:
                item.setChecked(!item.isChecked());
                preferences.setBoolean(R.string.p_show_hidden_tasks, item.isChecked());
                reconstructCursor();
                localBroadcastManager.broadcastRefresh();
                return true;
            case R.id.menu_show_completed:
                item.setChecked(!item.isChecked());
                preferences.setBoolean(R.string.p_show_completed_tasks, item.isChecked());
                reconstructCursor();
                localBroadcastManager.broadcastRefresh();
                return true;
            case R.id.menu_filter_settings:
                Intent intent = new Intent(getActivity(), FilterSettingsActivity.class);
                intent.putExtra(FilterSettingsActivity.TOKEN_FILTER, filter);
                startActivityForResult(intent, REQUEST_EDIT_FILTER);
                return true;
            case R.id.menu_clear_completed:
                dialogBuilder.newMessageDialog(R.string.clear_completed_tasks_confirmation)
                        .setPositiveButton(android.R.string.ok, (dialog, which) -> clearCompleted())
                        .setNegativeButton(android.R.string.cancel, null)
                        .show();
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    protected void clearCompleted() {
        tracker.reportEvent(Tracking.Events.CLEAR_COMPLETED);
        new ProgressDialogAsyncTask(getActivity(), dialogBuilder) {
            @Override
            protected Integer doInBackground(Void... params) {
                return taskDeleter.clearCompleted(filter);
            }

            @Override
            protected int getResultResource() {
                return R.string.delete_multiple_tasks_confirmation;
            }
        }.execute();
    }

    @OnClick(R.id.fab)
    void createNewTask() {
        Task task = addTask("");
        onTaskListItemClicked(task.getId());
    }

    public Task addTask(String title) {
        return taskCreator.createWithValues(filter.valuesForNewTasks, title);
    }

    private void setupRefresh(SwipeRefreshLayout layout) {
        layout.setOnRefreshListener(this);
        layout.setColorSchemeColors(checkBoxes.getPriorityColorsArray());
    }

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

        filter.setFilterQueryOverride(null);

        recyclerAdapter.applyToRecyclerView(recyclerView);
        recyclerView.setLayoutManager(new LinearLayoutManager(context));
    }

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

        localBroadcastManager.registerRefreshReceiver(refreshReceiver);

        refresh();
    }

    public Snackbar makeSnackbar(String text) {
        Snackbar snackbar = Snackbar.make(coordinatorLayout, text, 8000)
                .setActionTextColor(getColor(context, R.color.snackbar_text_color));
        snackbar.getView().setBackgroundColor(getColor(context, R.color.snackbar_background));
        return snackbar;
    }

    @Override
    public void onPause() {
        super.onPause();

        localBroadcastManager.unregisterReceiver(refreshReceiver);
    }

    /**
     * Receiver which receives refresh intents
     *
     * @author Tim Su <tim@todoroo.com>
     *
     */
    protected class RefreshReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            refresh();
        }
    }

    /**
     * Called by the RefreshReceiver when the task list receives a refresh
     * broadcast. Subclasses should override this.
     */
    private void refresh() {
        loadTaskListContent();

        setSyncOngoing(gtasksPreferenceService.isOngoing());
    }

    /*
     * ======================================================================
     * =================================================== managing list view
     * ======================================================================
     */

    /**
     * Load or re-load action items and update views
     */
    public void loadTaskListContent() {
        Cursor taskCursor = taskAdapter.getCursor();

        // stash selected items
        Bundle saveState = recyclerAdapter.getSaveState();

        taskCursor.requery();
        if (taskAdapter.getCount() == 0) {
            swipeRefreshLayout.setVisibility(View.GONE);
            emptyRefreshLayout.setVisibility(View.VISIBLE);
        } else {
            recyclerAdapter.notifyDataSetChanged();
            recyclerAdapter.restoreSaveState(saveState);
            swipeRefreshLayout.setVisibility(View.VISIBLE);
            emptyRefreshLayout.setVisibility(View.GONE);
        }
    }

    protected TaskAdapter createTaskAdapter(TodorooCursor<Task> cursor) {
        return new TaskAdapter(context, cursor);
    }

    public static final String TAGS_METADATA_JOIN = "for_tags"; //$NON-NLS-1$

    public  static final String FILE_METADATA_JOIN = "for_actions"; //$NON-NLS-1$

    /**
     * Fill in the Task List with current items
     */
    protected void setTaskAdapter() {
        if (filter == null) {
            return;
        }

        TodorooCursor<Task> currentCursor = taskListDataProvider.constructCursor(filter, taskProperties());
        if (currentCursor == null) {
            return;
        }

        // set up list adapters
        taskAdapter = createTaskAdapter(currentCursor);
        recyclerAdapter = new TaskListRecyclerAdapter(getActivity(), taskAdapter, viewHolderFactory,
                this, taskDeleter, taskDuplicator, tracker, dialogBuilder);
    }

    public Property<?>[] taskProperties() {
        return TaskAdapter.PROPERTIES;
    }

    public Filter getFilter() {
        return filter;
    }

    public void reconstructCursor() {
        TodorooCursor<Task> cursor = taskListDataProvider.constructCursor(filter, taskProperties());
        if (cursor == null || taskAdapter == null) {
            return;
        }
        taskAdapter.changeCursor(cursor);
    }

    /*
     * ======================================================================
     * ============================================================== actions
     * ======================================================================
     */

    public void onTaskCreated(List<Task> tasks) {
        for (Task task : tasks) {
            onTaskCreated(task.getUuid());
        }
        syncAdapterHelper.requestSynchronization();
    }

    public void onTaskCreated(String uuid) {
    }

    public void onTaskDelete(List<Task> tasks) {
        for (Task task : tasks) {
            onTaskDelete(task);
        }
    }

    protected void onTaskDelete(Task task) {
        TaskListActivity activity = (TaskListActivity) getActivity();
        TaskEditFragment tef = activity.getTaskEditFragment();
        if (tef != null) {
            if (task.getId() == tef.model.getId()) {
                tef.discard();
            }
        }
        timerPlugin.stopTimer(task);
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == VOICE_RECOGNITION_REQUEST_CODE) {
            if (resultCode == Activity.RESULT_OK) {
                Callback<String> quickAddTask = title -> {
                    Task task = addTask(title);
                    taskCreator.addToCalendar(task);
                    onTaskListItemClicked(task.getId());
                    loadTaskListContent();
                    onTaskCreated(task.getUUID());
                };
                voiceInputAssistant.handleActivityResult(data, quickAddTask);
            }
        } else if (requestCode == REQUEST_EDIT_FILTER) {
            if (resultCode == Activity.RESULT_OK) {
                String action = data.getAction();
                TaskListActivity activity = (TaskListActivity) getActivity();
                if (FilterSettingsActivity.ACTION_FILTER_DELETED.equals(action)) {
                    activity.onFilterItemClicked(null);
                } else if(FilterSettingsActivity.ACTION_FILTER_RENAMED.equals(action)) {
                    activity.getIntent().putExtra(TaskListActivity.OPEN_FILTER,
                            (Filter) data.getParcelableExtra(FilterSettingsActivity.TOKEN_FILTER));
                    activity.recreate();
                }
            }
        } else {
            super.onActivityResult(requestCode, resultCode, data);
        }
    }

    @Override
    public boolean onContextItemSelected(android.view.MenuItem item) {
        return onOptionsItemSelected(item);
    }
    public void onTaskListItemClicked(long taskId) {
        callbacks.onTaskListItemClicked(taskId);
    }

    protected boolean hasDraggableOption() {
        return BuiltInFilterExposer.isInbox(context, filter) || BuiltInFilterExposer.isTodayFilter(context, filter);
    }
}