// user-notification.js
// Copyright (C) 2022 DTP Technologies, LLC
// License: Apache-2.0

'use strict';

const path = require('path');

const mongoose = require('mongoose');
const UserNotification = mongoose.model('UserNotification');

const pug = require('pug');
const striptags = require('striptags');

const { SiteService, SiteError } = require('../../lib/site-lib');

class UserNotificationService extends SiteService {

  constructor (dtp) {
    super(dtp, module.exports);
    this.populateUserNotification = [
      {
        path: 'user',
        select: '_id username username_lc displayName picture',
      },
      {
        path: 'attachment',
      },
    ];
  }

  async start ( ) {
    this.templates = { };
    this.templates.notification = pug.compileFile(path.join(this.dtp.config.root, 'app', 'views', 'notification', 'components', 'notification-standalone.pug'));
  }

  async create (user, notificationDefinition) {
    const NOW = new Date();

    /*
     * Validate general notification data
     */

    if (!notificationDefinition.action) {
      throw new SiteError(406, 'Missing action');
    }
    if (!notificationDefinition.content) {
      throw new SiteError(406, 'Missing content');
    }
    if (!notificationDefinition.href) {
      throw new SiteError(406, 'Missing href');
    }

    /*
     * Validate source data
     */

    if (!notificationDefinition.source) {
      throw new SiteError(406, 'Missing source information');
    }

    /*
     * Validate source site
     */

    if (!notificationDefinition.source.site) {
      throw new SiteError(406, 'Missing source site information');
    }
    if (!notificationDefinition.source.site.name) {
      throw new SiteError(406, 'Missing source site name');
    }
    if (!notificationDefinition.source.site.description) {
      throw new SiteError(406, 'Missing source site description');
    }
    if (!notificationDefinition.source.site.domain) {
      throw new SiteError(406, 'Missing source site domain');
    }
    if (!notificationDefinition.source.site.domainKey) {
      throw new SiteError(406, 'Missing source site domain key');
    }
    if (!notificationDefinition.source.site.company) {
      throw new SiteError(406, 'Missing source site company name');
    }
    if (!notificationDefinition.source.site.coreAuth ||
        !notificationDefinition.source.site.coreAuth.scopes ||
        !Array.isArray(notificationDefinition.source.site.coreAuth.scopes) ||
        (notificationDefinition.source.site.coreAuth.scopes.length === 0)) {
      throw new SiteError(406, 'Missing source site Core auth or scope information');
    }

    /*
     * Validate source package
     */

    if (!notificationDefinition.source.pkg) {
      throw new SiteError(406, 'Missing source package information');
    }
    if (!notificationDefinition.source.pkg.name) {
      throw new SiteError(406, 'Missing source package name');
    }
    if (!notificationDefinition.source.pkg.version) {
      throw new SiteError(406, 'Missing source package version');
    }

    /*
     * Validate source emitter
     */

    if (!notificationDefinition.source.emitter) {
      throw new SiteError(406, 'Missing source emitter information');
    }
    if (!notificationDefinition.source.emitter.emitterId) {
      throw new SiteError(406, 'Missing source emitter ID');
    }
    if (!notificationDefinition.source.emitter.username) {
      throw new SiteError(406, 'Missing source emitter username');
    }
    if (!notificationDefinition.source.emitter.href) {
      throw new SiteError(406, 'Missing source emitter href');
    }

    const notification = new UserNotification();
    notification.created = NOW;
    notification.user = user._id;
    notification.status = 'new';

    notification.action = striptags(notificationDefinition.action.trim().toLowerCase());
    if (notificationDefinition.label) {
      notification.label = striptags(notificationDefinition.label.trim());
    }
    notification.content = striptags(notificationDefinition.content.trim());
    notification.href = striptags(notificationDefinition.href.trim());

    notification.source = {
      pkg: {
        name: striptags(notificationDefinition.source.pkt.name.trim().toLowerCase()),
        version: striptags(notificationDefinition.source.pkt.version.trim()),
      },
      site: {
        name: striptags(notificationDefinition.source.site.name.trim()),
        domain: striptags(notificationDefinition.source.site.domain.trim().toLowerCase()),
        domainKey: striptags(notificationDefinition.source.site.domainKey.trim().toLowerCase()),
        coreAuth: {
          scopes: notificationDefinition.source.site.coreAuth.scopes.map((scope) => scope.trim().toLowerCase()),
        },
      },
      emitter: {
        emitterId: mongoose.Types.ObjectId(notificationDefinition.source.emitter.emitterId),
        username: striptags(notificationDefinition.source.emitter.username.trim()),
        href: striptags(notificationDefinition.source.emitter.href.trim()),
      },
    };

    if (notificationDefinition.source.site.company) {
      notification.source.site.company = striptags(notificationDefinition.source.site.company.trim());
    }
    if (notificationDefinition.source.site.description) {
      notification.source.site.description = striptags(notificationDefinition.source.site.description.trim());
    }

    if (notificationDefinition.source.emitter.displayName) {
      notification.source.emitter.displayName = striptags(notificationDefinition.source.emitter.displayName);
    }

    notification.attachmentType = notificationDefinition.attachmentType;
    notification.attachment = notificationDefinition.attachment;

    await notification.save();

    return notification.toObject();
  }

  async getNewCountForUser (user) {
    const result = await UserNotification.aggregate([
      {
        $match: {
          user: user._id,
          status: 'new',
        },
      },
      {
        $group: {
          _id: { user: 1 },
          count: { $sum: 1 },
        },
      },
      {
        $project: {
          _id: -1,
          count: '$count',
        },
      },
    ]);
    this.log('getNewCountForUser', { result });
    return result[0].count;
  }

  async getForUser (user, pagination) {
    const notifications = await UserNotification
      .find({ user: user._id })
      .sort({ created: -1 })
      .skip(pagination.skip)
      .limit(pagination.cpp)
      .populate(this.populateUserNotification)
      .lean();
    const newNotifications = notifications.map((notif) => notif.status === 'new');
    if (newNotifications.length > 0) {
      await UserNotification.updateMany(
        { _id: { $in: newNotifications.map((notif) => notif._id) } },
        { $set: { stats: 'seen' } },
      );
    }
    return notifications;
  }
}

module.exports = {
  slug: 'user-notification',
  name: 'userNotification',
  create: (dtp) => { return new UserNotificationService(dtp); },
};