/**
 * ActivityTimeline Model
 * Tracks all interactions with contacts and organizations across projects
 */

const { ObjectId } = require('mongodb');
const { getCollection } = require('../utils/db.util');

class ActivityTimeline {
  /**
   * Create a new activity entry
   */
  static async create(data) {
    const collection = await getCollection('activity_timeline');

    const activity = {
      // Who/what this activity is related to
      contact_id: data.contact_id ? new ObjectId(data.contact_id) : null,
      organization_id: data.organization_id ? new ObjectId(data.organization_id) : null,

      // Activity details
      type: data.type, // contact_form, media_inquiry, case_submission, email_sent, call, meeting, note
      project: data.project || 'tractatus', // Which project this activity belongs to

      // Activity content
      title: data.title,
      description: data.description || null,

      // Related record (original submission/inquiry)
      related_record: data.related_record ? {
        type: data.related_record.type, // contact, media, case, email, etc
        id: new ObjectId(data.related_record.id)
      } : null,

      // Activity metadata
      metadata: {
        direction: data.metadata?.direction || 'inbound', // inbound, outbound
        channel: data.metadata?.channel || 'web', // web, email, phone, meeting
        status: data.metadata?.status || 'completed', // completed, pending, failed
        outcome: data.metadata?.outcome || null, // responded, no_response, follow_up_needed
        duration: data.metadata?.duration || null, // for calls/meetings (minutes)
        attachments: data.metadata?.attachments || []
      },

      // Who performed this activity (user)
      performed_by: data.performed_by ? new ObjectId(data.performed_by) : null,
      performed_by_name: data.performed_by_name || 'System',

      // Timestamps
      occurred_at: data.occurred_at || new Date(),
      created_at: new Date()
    };

    const result = await collection.insertOne(activity);
    return { ...activity, _id: result.insertedId };
  }

  /**
   * Get timeline for a contact
   */
  static async getByContact(contactId, options = {}) {
    const collection = await getCollection('activity_timeline');
    const { limit = 50, skip = 0 } = options;

    return await collection
      .find({ contact_id: new ObjectId(contactId) })
      .sort({ occurred_at: -1 })
      .skip(skip)
      .limit(limit)
      .toArray();
  }

  /**
   * Get timeline for an organization
   */
  static async getByOrganization(organizationId, options = {}) {
    const collection = await getCollection('activity_timeline');
    const { limit = 50, skip = 0 } = options;

    return await collection
      .find({ organization_id: new ObjectId(organizationId) })
      .sort({ occurred_at: -1 })
      .skip(skip)
      .limit(limit)
      .toArray();
  }

  /**
   * Get combined timeline (contact + organization)
   */
  static async getCombinedTimeline(contactId, organizationId, options = {}) {
    const collection = await getCollection('activity_timeline');
    const { limit = 100, skip = 0 } = options;

    const query = {
      $or: [
        { contact_id: new ObjectId(contactId) },
        { organization_id: new ObjectId(organizationId) }
      ]
    };

    return await collection
      .find(query)
      .sort({ occurred_at: -1 })
      .skip(skip)
      .limit(limit)
      .toArray();
  }

  /**
   * Get recent activity across all projects
   */
  static async getRecent(options = {}) {
    const collection = await getCollection('activity_timeline');
    const { limit = 50, project = null, type = null } = options;

    const query = {};
    if (project) query.project = project;
    if (type) query.type = type;

    return await collection
      .find(query)
      .sort({ occurred_at: -1 })
      .limit(limit)
      .toArray();
  }

  /**
   * Delete activity
   */
  static async delete(id) {
    const collection = await getCollection('activity_timeline');
    return await collection.deleteOne({ _id: new ObjectId(id) });
  }

  /**
   * Get statistics
   */
  static async getStats(filters = {}) {
    const collection = await getCollection('activity_timeline');

    const query = {};
    if (filters.project) query.project = filters.project;
    if (filters.contact_id) query.contact_id = new ObjectId(filters.contact_id);
    if (filters.organization_id) query.organization_id = new ObjectId(filters.organization_id);

    const [total, byType, byProject, byChannel] = await Promise.all([
      collection.countDocuments(query),
      collection.aggregate([
        { $match: query },
        { $group: { _id: '$type', count: { $sum: 1 } } }
      ]).toArray(),
      collection.aggregate([
        { $match: query },
        { $group: { _id: '$project', count: { $sum: 1 } } }
      ]).toArray(),
      collection.aggregate([
        { $match: query },
        { $group: { _id: '$metadata.channel', count: { $sum: 1 } } }
      ]).toArray()
    ]);

    return {
      total,
      by_type: byType.reduce((acc, item) => {
        acc[item._id] = item.count;
        return acc;
      }, {}),
      by_project: byProject.reduce((acc, item) => {
        acc[item._id] = item.count;
        return acc;
      }, {}),
      by_channel: byChannel.reduce((acc, item) => {
        acc[item._id] = item.count;
        return acc;
      }, {})
    };
  }
}

module.exports = ActivityTimeline;