package com.andela.mrm.room_availability.room_availability_utils;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Process;
import android.support.constraint.ConstraintLayout;
import android.view.View;

import com.andela.mrm.room_events.CalendarEvent;
import com.andela.mrm.room_setup.country.CountryActivity;
import com.andela.mrm.util.ConvergeUIUtils;
import com.andela.mrm.util.InsertGoogleCalendar;
import com.google.api.client.googleapis.extensions.android.gms.auth.GoogleAccountCredential;

import java.util.Map;

import io.reactivex.disposables.CompositeDisposable;

import static com.andela.mrm.room_setup.country.CountryActivity.SHARED_CALENDAR_ID;
import static com.andela.mrm.room_setup.country.CountryActivity.SHARED_PREF_FILENAME;

/**
 * Add a quick meeting and refresh app in background thread.
 */
public class AddEventInBackground {
    Context mContext;

    public AddEventInBackground(Context mContext)
    {
        this.mContext = mContext;
    }

    SharedPreferences sharedPreferences = this.mContext.getSharedPreferences(SHARED_PREF_FILENAME,
                                             Context.MODE_PRIVATE);
    CountryActivity countryActivity = new CountryActivity();

    // TODO: sharedPreference should be used to retrieve calendarId instead of hard coding it.
    String calendarId = countryActivity.getSharedCalendarId();

    View mView;
    Map mSnackbarStringMap;
    CompositeDisposable mDisposables;

    /**
     * Getter for the RoomAvailablityActivity context.
     *
     * @param context the room availablity activity context.
     */
    public void getContext(Context context) {
        this.mContext = context;
    }

    /**
     * Getter for resources from RoomAvailablityActivity needed to create meeting.
     *
     * @param map         map containing strings flashed to user for better UX.
     * @param view        the main view.
     * @param disposables disposables used for background reloading.
     */
    public void getQuickMeetingResources(Map map, View view, CompositeDisposable disposables) {
        this.mView = view;
        this.mSnackbarStringMap = map;
        this.mDisposables = disposables;
    }

    /**
     * Set up quick meeting.
     *  @param selectedDuration duration of quick meeting.
     * @param freeDisplay      button clicked.
     * @param credential       Google account credentials of logged in user.
     */
    public void setQuickMeeting(long selectedDuration, ConstraintLayout freeDisplay,
                                GoogleAccountCredential credential) {
        //TODO:sharedPreference should be used tO retrieve admin email address
        CalendarEvent calendarEvent = CurrentCalendarEventUtils.getCurrentCalendarEvent();
        long currentTime = System.currentTimeMillis();
        if (calendarEvent != null && "Available".equals(calendarEvent.getSummary())) {
            long availableTime = calendarEvent.getEndTime() - currentTime;
            if (availableTime > selectedDuration) {
                addEventInBackground(currentTime, selectedDuration, freeDisplay, credential);
            } else {
                displayEventSnackbar(freeDisplay,
                        mSnackbarStringMap.get("roomUnavailable").toString());
            }
        } else if (calendarEvent == null && CurrentCalendarEventUtils.calendarEvents.isEmpty()) {
            addEventInBackground(currentTime, selectedDuration, freeDisplay, credential);
        } else {
            displayEventSnackbar(freeDisplay,
                    mSnackbarStringMap.get("roomUnavailable").toString());
        }
    }

    /**
     * Add the event and reload activity in the background.
     *
     * @param currentTime  current device time.
     * @param selectedTime time selected for event creation.
     * @param freeDisplay  button clicked.
     * @param credential   credentials of signed in google account.
     */
    private void addEventInBackground(
            long currentTime,
            long selectedTime,
            ConstraintLayout freeDisplay,
            GoogleAccountCredential credential
    ) {
        new Thread(() -> {
            Process.setThreadPriority(
                    Process.THREAD_PRIORITY_BACKGROUND);
            try {
                Boolean response = InsertGoogleCalendar.createCalendarEvent(
                        credential, calendarId, currentTime, selectedTime);
                if (response) {
                    displayEventSnackbar(freeDisplay,
                            mSnackbarStringMap.get("eventSetupSuccess").toString());
                } else {
                    displayEventSnackbar(freeDisplay,
                            mSnackbarStringMap.get("eventSetupFail").toString());
                }
            } catch (Exception ex) {
                // Logs disabled
            }
        }).start();
    }

    /**
     * Display snackbar with appropriate message. Change color of clicked button.
     *
     * @param freeDisplay   button that was clicked.
     * @param displayString string to be displayed on snackbar.
     */
    private void displayEventSnackbar(ConstraintLayout freeDisplay, String displayString) {
        ConvergeUIUtils.Companion.setButtonColor(mContext, freeDisplay);
        ConvergeUIUtils.Companion.showSnackBar(mContext,
                mView,
                displayString);
    }
}