// @flow

import * as Permissions from 'expo-permissions';
import {Notifications} from 'expo';
import AsyncStorageManager from "./AsyncStorageManager";

const EXPO_TOKEN_SERVER = 'https://srv-falcon.etud.insa-toulouse.fr/~amicale_app/expo_notifications/save_token.php';

/**
 * Static class used to manage notifications sent to the user
 */
export default class NotificationsManager {

    /**
     * Async function asking permission to send notifications to the user
     *
     * @returns {Promise}
     */
    static async askPermissions() {
        const {status: existingStatus} = await Permissions.getAsync(Permissions.NOTIFICATIONS);
        let finalStatus = existingStatus;
        if (existingStatus !== 'granted') {
            const {status} = await Permissions.askAsync(Permissions.NOTIFICATIONS);
            finalStatus = status;
        }
        return finalStatus === 'granted';
    }

    /**
     * Async function sending a notification without delay to the user
     *
     * @param title {String} Notification title
     * @param body {String} Notification body text
     * @returns {Promise<import("react").ReactText>} Notification Id
     */
    static async sendNotificationImmediately(title: string, body: string) {
        await NotificationsManager.askPermissions();
        return await Notifications.presentLocalNotificationAsync({
            title: title,
            body: body,
        });
    };

    /**
     * Async function sending notification at the specified time
     *
     * @param title Notification title
     * @param body Notification body text
     * @param time Time at which we should send the notification
     * @param data Data to send with the notification, used for listeners
     * @param androidChannelID
     * @returns {Promise<import("react").ReactText>} Notification Id
     */
    static async scheduleNotification(title: string, body: string, time: number, data: Object, androidChannelID: string): Promise<string> {
        await NotificationsManager.askPermissions();
        console.log(time);
        let date = new Date();
        date.setTime(time);
        console.log(date);
        return Notifications.scheduleLocalNotificationAsync(
            {
                title: title,
                body: body,
                data: data,
                ios: { // configuration for iOS.
                    sound: true
                },
                android: { // configuration for Android.
                    channelId: androidChannelID,
                }
            },
            {
                time: time,
            },
        );
    };

    /**
     * Async function used to cancel the notification of a specific ID
     * @param notificationID {Number} The notification ID
     * @returns {Promise}
     */
    static async cancelScheduledNotification(notificationID: number) {
        await Notifications.cancelScheduledNotificationAsync(notificationID);
    }

    /**
     * Save expo token to allow sending notifications to this device.
     * This token is unique for each device and won't change.
     * It only needs to be fetched once, then it will be saved in storage.
     *
     * @return {Promise<void>}
     */
    static async initExpoToken() {
        let token = AsyncStorageManager.getInstance().preferences.expoToken.current;
        if (token === '') {
            let expoToken = await Notifications.getExpoPushTokenAsync();
            // Save token for instant use later on
            AsyncStorageManager.getInstance().savePref(AsyncStorageManager.getInstance().preferences.expoToken.key, expoToken);
        }
    }

    static getMachineNotificationWatchlist(callback: Function) {
        let token = AsyncStorageManager.getInstance().preferences.expoToken.current;
        if (token === '') {
            throw Error('Expo token not available');
        }
        let data = {
            function: 'get_machine_watchlist',
            token: token,
        };
        fetch(EXPO_TOKEN_SERVER, {
            method: 'POST',
            headers: new Headers({
                Accept: 'application/json',
                'Content-Type': 'application/json',
            }),
            body: JSON.stringify(data) // <-- Post parameters
        })
            .then((response) => response.json())
            .then((responseJson) => {
                callback(responseJson);
            })
            .catch((error) => {
                console.log(error);
            });
    }

    /**
     * Ask the server to enable/disable notifications for the specified machine
     *
     * @param machineID
     * @param isEnabled
     */
    static setupMachineNotification(machineID: string, isEnabled: boolean) {
        let token = AsyncStorageManager.getInstance().preferences.expoToken.current;
        if (token === '') {
            throw Error('Expo token not available');
        }
        let data = {
            function: 'setup_machine_notification',
            token: token,
            machine_id: machineID,
            enabled: isEnabled
        };
        fetch(EXPO_TOKEN_SERVER, {
            method: 'POST',
            headers: new Headers({
                Accept: 'application/json',
                'Content-Type': 'application/json',
            }),
            body: JSON.stringify(data) // <-- Post parameters
        })
            .then((response) => response.text())
            .then((responseText) => {
                console.log(responseText);
            })
            .catch((error) => {
                console.log(error);
            });
    }

    /**
     * Send the selected reminder time for notifications to the server
     * @param time
     */
    static setMachineReminderNotificationTime(time: number) {
        console.log(time);
        let token = AsyncStorageManager.getInstance().preferences.expoToken.current;
        if (token === '') {
            throw Error('Expo token not available');
        }
        let data = {
            function: 'set_machine_reminder',
            token: token,
            time: time,
        };
        fetch(EXPO_TOKEN_SERVER, {
            method: 'POST',
            headers: new Headers({
                Accept: 'application/json',
                'Content-Type': 'application/json',
            }),
            body: JSON.stringify(data) // <-- Post parameters
        })
            .then((response) => response.text())
            .then((responseText) => {
                console.log(responseText);
            })
            .catch((error) => {
                console.log(error);
            });
    }
}