import { Observer } from "../observe/Observer";
import { ActiveUserViewModel } from "../viewmodel/ActiveUserViewModel";
import { ChatModel } from "../model/ChatModel";
import log = require("loglevel");
import * as DOMPurify from "dompurify";
import { SearchService } from "../service/SearchService";
import { UserModel } from "../model/UserModel";
import { UserViewDeps } from "./UserViewDeps";
import { ObserverData } from "../observe/ObserverData";
import { JsonAPI } from "../singleton/JsonAPI";
import { NotificationService } from "../service/NotificationService";

export class UserView implements Observer<ActiveUserViewModel> {


    private readonly _model: UserModel;
    private readonly _chatModel: ChatModel;
    private readonly _usersListElement: HTMLElement;
    private readonly _userSearchInputElement: HTMLInputElement;
    private readonly _userSearchButton: HTMLElement;
    private readonly _userSearchCancelButton: HTMLElement;
    private readonly _searchService: SearchService<ActiveUserViewModel>;
    private readonly _userContactOnlineTemplate: Handlebars.TemplateDelegate<ActiveUserViewModel>;
    private readonly _userContactOfflineTemplate: Handlebars.TemplateDelegate<ActiveUserViewModel>;
    private readonly _notificationService: NotificationService;

    constructor(deps: UserViewDeps) {
        this._model = deps.model;
        this._chatModel = deps.chatModel;
        this._usersListElement = deps.usersListElement;
        this._userSearchInputElement = deps.userSearchInputElement;
        this._userSearchButton = deps.userSearchButton;
        this._userSearchCancelButton = deps.userSearchCancelButton;
        this._searchService = deps.searchService;
        this._userContactOnlineTemplate = deps.userContactOnlineTemplate;
        this._userContactOfflineTemplate = deps.userContactOfflineTemplate;
        this._notificationService = deps.notificationService;

        this._addSearchEventListeners();
    }

    update(d: ObserverData<ActiveUserViewModel>): void {
        let html: string = "";
        d.data.forEach((element: ActiveUserViewModel) => {
            element.online ? html += this._userContactOnlineTemplate(element) :
                html += this._userContactOfflineTemplate(element);
        });
        $(this._usersListElement).html(DOMPurify.sanitize(html));
        this._addUserCallBacks();
    }

    private _addSearchEventListeners(): void {
        this._addSearchButtonEL();
        this._addSearchCancelEL();
        this._addSearchInputEL();
    }

    private _addUserCallBacks(): void {
        let userBoxes = document.getElementsByClassName('user-box');

        Array.from(userBoxes).forEach((ub: Element) =>
            ub.addEventListener('click', this._userCallBack.bind(this, ub)))
    }


    private _userCallBack(el: Element): void {
        this._chatModel.clear();
        let current = document.getElementsByClassName('user-box active');

        let passphrase: string = '';
        if (current.length > 0) {
            let passphraseInput = document.getElementById('passphrase') as any;

            if (passphraseInput == null) {
                log.error('passphraseInput element reference is null');
                return;
            }
            passphrase = passphraseInput.value
            if (passphrase == '' || passphrase == null) {
                // alert('Please input passphrase')
                // alertify.error('Please enter a passphrase');
                log.error('passphrase is empty or null');
                return;
            }
            current[0].className = current[0].className.replace(" active", "");

        }
        // Add the active class to the current/clicked button
        else if (current.length == 0) {
            let elem = document.getElementById('passphrase-initial') as any;
            if (elem == null) {
                log.error('passphraseInput element reference is null');
                return;
            }
            passphrase = elem.value;
            if (passphrase == '' || passphrase == null) {
                //     // alert('Please input passphrase')
                //     // alertify.error('Please enter a passphrase');
                log.error('passphrase is empty or null');
                return;
            }
            // @ts-ignore: Object is possibly 'null'.
            document.getElementById('no-user-selected').hidden = true;
            // @ts-ignore: Object is possibly 'null'.
            document.getElementById('chat-card').hidden = false;
            // @ts-ignore: Object is possibly 'null'.
            elem.hidden = true;
        }
        // console.log(this.getElementsByClassName('to-user-span'));
        let elem = el.getElementsByClassName('to-user-span')[0] as HTMLElement;
        let userName = elem.innerText;
        JsonAPI.contactName = userName;
        // @ts-ignore: Object is possibly 'null'.
        document.getElementById('user-name-span').innerText = userName;
        let vm = this._model.activeUsersList.find(vm => vm.userName === userName);
        if (!vm) {
            vm = new ActiveUserViewModel();
            vm.userName = userName;
        }
        this._notificationService.passphrasePrompt(vm, this._model.activeUsersList,
            this._chatModel.getMessages.bind(this._chatModel),
            this._promptHandler.bind(this));
        // this._chatModel.getMessages(userName, vm.passphrase, null, "new");
        el.className += " active";
    }

    private _promptHandler(vm: ActiveUserViewModel, vms: ActiveUserViewModel[]) {
        // vms.filter(v => v.userName == vm.userName).map(v => v.userName = vm.userName)
        log.debug(vms)
        this._model.notify();
    }

    private _addSearchButtonEL() {
        this._userSearchButton.addEventListener('submit', (e) => {
            e.preventDefault();
            // log.trace(temp);
            const searchTerm = this._userSearchInputElement.value;
            log.debug("search term value = " + searchTerm);
            const list = this._model.activeUsersList;
            log.debug("active users");
            log.debug(list);
            if (list == null) {
                log.error("Users list is null");
                return;
            }
            let searchResult = this._searchService.search(list, searchTerm);
            this.update({ data: searchResult, op: "" });
            log.debug(searchResult);
        })
    }

    private _addSearchInputEL() {
        this._userSearchInputElement.addEventListener('input', (e) => {
            e.preventDefault();
            if (this._userSearchInputElement.value.length < 2) {
                log.debug("inputted")
                this._userSearchCancelButton.hidden = false;
            }
        })
    }

    private _addSearchCancelEL() {
        this._userSearchCancelButton.addEventListener('click', (e) => {
            e.preventDefault();
            this._userSearchInputElement.value = "";
            this._userSearchCancelButton.hidden = true;
            let list = this._model.activeUsersList;
            this.update({ data: list, op: "" })
        })
    }

}