// Converse.js
// https://conversejs.org
//
// Copyright (c) 2013-2019, the Converse.js developers
// Licensed under the Mozilla Public License (MPLv2)
/**
 * @module converse-message-view
 */
import "./utils/html";
import "@converse/headless/converse-emoji";
import URI from "urijs";
import converse from  "@converse/headless/converse-core";
import { debounce } from 'lodash'
import filesize from "filesize";
import log from "@converse/headless/log";
import tpl_csn from "templates/csn.html";
import tpl_file_progress from "templates/file_progress.html";
import tpl_info from "templates/info.html";
import tpl_message from "templates/message.html";
import tpl_message_versions_modal from "templates/message_versions_modal.html";
import tpl_spinner from "templates/spinner.html";
import xss from "xss/dist/xss";

const { Strophe, dayjs } = converse.env;
const u = converse.env.utils;


converse.plugins.add('converse-message-view', {

    dependencies: ["converse-modal", "converse-chatboxviews"],

    initialize () {
        /* The initialize function gets called as soon as the plugin is
         * loaded by converse.js's plugin machinery.
         */
        const { _converse } = this;
        const { __ } = _converse;


        function onTagFoundDuringXSSFilter (tag, html, options) {
            /* This function gets called by the XSS library whenever it finds
             * what it thinks is a new HTML tag.
             *
             * It thinks that something like <https://example.com> is an HTML
             * tag and then escapes the <> chars.
             *
             * We want to avoid this, because it prevents these URLs from being
             * shown properly (whithout the trailing &gt;).
             *
             * The URI lib correctly trims a trailing >, but not a trailing &gt;
             */
            if (options.isClosing) {
                // Closing tags don't match our use-case
                return;
            }
            const uri = new URI(tag);
            const protocol = uri.protocol().toLowerCase();
            if (!["https", "http", "xmpp", "ftp"].includes(protocol)) {
                // Not a URL, the tag will get filtered as usual
                return;
            }
            if (uri.equals(tag) && `<${tag}>` === html.toLocaleLowerCase()) {
                // We have something like <https://example.com>, and don't want
                // to filter it.
                return html;
            }
        }


        _converse.api.settings.update({
            'show_images_inline': true,
            'allow_message_retraction': 'all'
        });

        _converse.MessageVersionsModal = _converse.BootstrapModal.extend({
            toHTML () {
                return tpl_message_versions_modal(Object.assign(
                    this.model.toJSON(), {
                    '__': __,
                    'dayjs': dayjs
                }));
            }
        });


        /**
         * @class
         * @namespace _converse.MessageView
         * @memberOf _converse
         */
        _converse.MessageView = _converse.ViewWithAvatar.extend({
            events: {
                'click .chat-msg__edit-modal': 'showMessageVersionsModal',
                'click .retry': 'onRetryClicked'
            },

            initialize () {
                this.debouncedRender = debounce(() => {
                    // If the model gets destroyed in the meantime,
                    // it no longer has a collection
                    if (this.model.collection) {
                        this.render();
                    }
                }, 50);

                if (this.model.rosterContactAdded) {
                    this.model.rosterContactAdded.then(() => {
                        this.listenTo(this.model.contact, 'change:nickname', this.debouncedRender);
                        this.debouncedRender();
                    });
                }

                if (this.model.occupant) {
                    this.listenTo(this.model.occupant, 'change:role', this.debouncedRender);
                    this.listenTo(this.model.occupant, 'change:affiliation', this.debouncedRender);
                    this.debouncedRender();
                }

                this.listenTo(this.model, 'change', this.onChanged);
                this.listenTo(this.model, 'destroy', this.fadeOut);
                this.listenTo(this.model, 'vcard:change', this.debouncedRender);
            },

            async render () {
                const is_followup = u.hasClass('chat-msg--followup', this.el);
                if (this.model.isOnlyChatStateNotification()) {
                    this.renderChatStateNotification()
                } else if (this.model.get('file') && !this.model.get('oob_url')) {
                    if (!this.model.file) {
                        log.error("Attempted to render a file upload message with no file data");
                        return this.el;
                    }
                    this.renderFileUploadProgresBar();
                } else if (this.model.get('type') === 'error') {
                    this.renderErrorMessage();
                } else if (this.model.get('type') === 'info') {
                    this.renderInfoMessage();
                } else {
                    await this.renderChatMessage();
                }
                is_followup && u.addClass('chat-msg--followup', this.el);
                return this.el;
            },

            async onChanged (item) {
                // Jot down whether it was edited because the `changed`
                // attr gets removed when this.render() gets called further down.
                const edited = item.changed.edited;
                if (this.model.changed.progress) {
                    return this.renderFileUploadProgresBar();
                }
                const isValidChange = prop => Object.prototype.hasOwnProperty.call(this.model.changed, prop);
                const props = ['moderated', 'retracted', 'correcting', 'message', 'type', 'upload', 'received', 'editable'];
                if (props.filter(isValidChange).length) {
                    await this.debouncedRender();
                }
                if (edited) {
                    this.onMessageEdited();
                }
            },

            fadeOut () {
                if (_converse.animate) {
                    setTimeout(() => this.remove(), 600);
                    u.addClass('fade-out', this.el);
                } else {
                    this.remove();
                }
            },

            async onRetryClicked () {
                this.showSpinner();
                await this.model.error.retry();
                this.model.destroy();
            },

            showSpinner () {
                this.el.innerHTML = tpl_spinner();
            },

            onMessageEdited () {
                if (this.model.get('is_archived')) {
                    return;
                }
                this.el.addEventListener(
                    'animationend',
                    () => u.removeClass('onload', this.el),
                    {'once': true}
                );
                u.addClass('onload', this.el);
            },

            replaceElement (msg) {
                if (this.el.parentElement) {
                    this.el.parentElement.replaceChild(msg, this.el);
                }
                this.setElement(msg);
                return this.el;
            },

            transformOOBURL (url) {
                return u.getOOBURLMarkup(_converse, url);
            },

            async transformBodyText (text) {
                /**
                 * Synchronous event which provides a hook for transforming a chat message's body text
                 * before the default transformations have been applied.
                 * @event _converse#beforeMessageBodyTransformed
                 * @param { _converse.MessageView } view - The view representing the message
                 * @param { string } text - The message text
                 * @example _converse.api.listen.on('beforeMessageBodyTransformed', (view, text) => { ... });
                 */
                await _converse.api.trigger('beforeMessageBodyTransformed', this, text, {'Synchronous': true});
                text = this.model.isMeCommand() ? text.substring(4) : text;
                text = xss.filterXSS(text, {'whiteList': {}, 'onTag': onTagFoundDuringXSSFilter});
                text = u.geoUriToHttp(text, _converse.geouri_replacement);
                text = u.addMentionsMarkup(text, this.model.get('references'), this.model.collection.chatbox);
                text = u.addHyperlinks(text);
                text = u.renderNewLines(text);
                text = u.addEmoji(text);
                /**
                 * Synchronous event which provides a hook for transforming a chat message's body text
                 * after the default transformations have been applied.
                 * @event _converse#afterMessageBodyTransformed
                 * @param { _converse.MessageView } view - The view representing the message
                 * @param { string } text - The message text
                 * @example _converse.api.listen.on('afterMessageBodyTransformed', (view, text) => { ... });
                 */
                await _converse.api.trigger('afterMessageBodyTransformed', this, text, {'Synchronous': true});
                return text;
            },

            async renderChatMessage () {
                await _converse.api.waitUntil('emojisInitialized');
                const time = dayjs(this.model.get('time'));
                const role = this.model.vcard ? this.model.vcard.get('role') : null;
                const roles = role ? role.split(',') : [];
                const is_retracted = this.model.get('retracted') || this.model.get('moderated') === 'retracted';
                const is_groupchat = this.model.get('type') === 'groupchat';
                const is_own_message = this.model.get('sender') === 'me';
                const chatbox = this.model.collection.chatbox;
                const may_retract_own_message = is_own_message && ['all', 'own'].includes(_converse.allow_message_retraction);
                const may_moderate_message = !is_own_message && is_groupchat &&
                    ['all', 'moderator'].includes(_converse.allow_message_retraction) &&
                    await chatbox.canRetractMessages();

                const retractable= !is_retracted && (may_moderate_message || may_retract_own_message);
                const msg = u.stringToElement(tpl_message(
                    Object.assign(
                        this.model.toJSON(), {
                         __,
                        is_retracted,
                        retractable,
                        'extra_classes': this.getExtraMessageClasses(),
                        'is_groupchat_message': is_groupchat,
                        'is_me_message': this.model.isMeCommand(),
                        'label_show': __('Show more'),
                        'occupant': this.model.occupant,
                        'pretty_time': time.format(_converse.time_format),
                        'retraction_text': is_retracted ? this.getRetractionText() : null,
                        'roles': roles,
                        'time': time.toISOString(),
                        'username': this.model.getDisplayName()
                    })
                ));

                const url = this.model.get('oob_url');
                if (url) {
                    msg.querySelector('.chat-msg__media').innerHTML = this.transformOOBURL(url);
                }

                if (!is_retracted) {
                    const text = this.model.getMessageText();
                    const msg_content = msg.querySelector('.chat-msg__text');
                    if (text && text !== url) {
                        msg_content.innerHTML = await this.transformBodyText(text);
                        await u.renderImageURLs(_converse, msg_content);
                    }
                }
                if (this.model.get('type') !== 'headline') {
                    this.renderAvatar(msg);
                }
                this.replaceElement(msg);
                if (this.model.collection) {
                    // If the model gets destroyed in the meantime, it no
                    // longer has a collection.
                    this.model.collection.trigger('rendered', this);
                }
            },

            renderInfoMessage () {
                const msg = u.stringToElement(
                    tpl_info(Object.assign(this.model.toJSON(), {
                        'extra_classes': 'chat-info',
                        'isodate': dayjs(this.model.get('time')).toISOString()
                    }))
                );
                return this.replaceElement(msg);
            },

            getRetractionText () {
                if (this.model.get('type') === 'groupchat' && this.model.get('moderated_by')) {
                    const retracted_by_mod = this.model.get('moderated_by');
                    const chatbox = this.model.collection.chatbox;
                    if (!this.model.mod) {
                        this.model.mod =
                            chatbox.occupants.findOccupant({'jid': retracted_by_mod}) ||
                            chatbox.occupants.findOccupant({'nick': Strophe.getResourceFromJid(retracted_by_mod)});
                    }
                    const modname = this.model.mod ? this.model.mod.getDisplayName() : 'A moderator';
                    return __('%1$s has removed this message', modname);
                } else {
                    return __('%1$s has removed this message', this.model.getDisplayName());
                }
            },

            renderErrorMessage () {
                const msg = u.stringToElement(
                    tpl_info(Object.assign(this.model.toJSON(), {
                        'extra_classes': 'chat-error',
                        'isodate': dayjs(this.model.get('time')).toISOString()
                    }))
                );
                return this.replaceElement(msg);
            },

            renderChatStateNotification () {
                let text;
                const from = this.model.get('from');
                const name = this.model.getDisplayName();

                if (this.model.get('chat_state') === _converse.COMPOSING) {
                    if (this.model.get('sender') === 'me') {
                        text = __('Typing from another device');
                    } else {
                        text = __('%1$s is typing', name);
                    }
                } else if (this.model.get('chat_state') === _converse.PAUSED) {
                    if (this.model.get('sender') === 'me') {
                        text = __('Stopped typing on the other device');
                    } else {
                        text = __('%1$s has stopped typing', name);
                    }
                } else if (this.model.get('chat_state') === _converse.GONE) {
                    text = __('%1$s has gone away', name);
                } else {
                    return;
                }
                const isodate = (new Date()).toISOString();
                this.replaceElement(
                      u.stringToElement(
                        tpl_csn({
                            'message': text,
                            'from': from,
                            'isodate': isodate
                        })));
            },

            renderFileUploadProgresBar () {
                const msg = u.stringToElement(tpl_file_progress(
                    Object.assign(this.model.toJSON(), {
                        '__': __,
                        'filename': this.model.file.name,
                        'filesize': filesize(this.model.file.size)
                    })));
                this.replaceElement(msg);
                this.renderAvatar();
            },

            showMessageVersionsModal (ev) {
                ev.preventDefault();
                if (this.model.message_versions_modal === undefined) {
                    this.model.message_versions_modal = new _converse.MessageVersionsModal({'model': this.model});
                }
                this.model.message_versions_modal.show(ev);
            },

            getExtraMessageClasses () {
                const is_retracted = this.model.get('retracted') || this.model.get('moderated') === 'retracted';
                const extra_classes = [
                    ...(this.model.get('is_delayed') ? ['delayed'] : []), ...(is_retracted ? ['chat-msg--retracted'] : [])
                ];
                if (this.model.get('type') === 'groupchat') {
                    if (this.model.occupant) {
                        extra_classes.push(this.model.occupant.get('role'));
                        extra_classes.push(this.model.occupant.get('affiliation'));
                    }
                    if (this.model.get('sender') === 'them' && this.model.collection.chatbox.isUserMentioned(this.model)) {
                        // Add special class to mark groupchat messages
                        // in which we are mentioned.
                        extra_classes.push('mentioned');
                    }
                }
                if (this.model.get('correcting')) {
                    extra_classes.push('correcting');
                }
                return extra_classes.filter(c => c).join(" ");
            }
        });
    }
});