/**
 * Contact Model
 * General contact form submissions (non-media, non-case)
 * Foundation for unified CRM system
 */

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

class Contact {
  /**
   * Create a new contact submission
   */
  static async create(data) {
    const collection = await getCollection('contacts');

    const contact = {
      type: data.type || 'general', // general, partnership, technical, feedback
      contact: {
        name: data.contact.name,
        email: data.contact.email,
        organization: data.contact.organization || null,
        phone: data.contact.phone || null
      },
      inquiry: {
        subject: data.inquiry.subject || null,
        message: data.inquiry.message
      },
      source: data.source || 'footer_contact', // Track where submission came from
      status: data.status || 'new', // new, assigned, responded, closed
      priority: data.priority || 'normal', // low, normal, high
      assigned_to: data.assigned_to || null,
      metadata: {
        user_agent: data.metadata?.user_agent,
        ip: data.metadata?.ip,
        source_page: data.metadata?.source_page,
        referrer: data.metadata?.referrer
      },
      response: {
        sent_at: data.response?.sent_at || null,
        content: data.response?.content || null,
        responder: data.response?.responder || null
      },
      created_at: new Date(),
      updated_at: new Date()
    };

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

  /**
   * Find contact by ID
   */
  static async findById(id) {
    const collection = await getCollection('contacts');
    return await collection.findOne({ _id: new ObjectId(id) });
  }

  /**
   * Find contacts by status
   */
  static async findByStatus(status, options = {}) {
    const collection = await getCollection('contacts');
    const { limit = 20, skip = 0 } = options;

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

  /**
   * Find contacts by type
   */
  static async findByType(type, options = {}) {
    const collection = await getCollection('contacts');
    const { limit = 20, skip = 0 } = options;

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

  /**
   * List all contacts with filtering
   */
  static async list(filters = {}, options = {}) {
    const collection = await getCollection('contacts');
    const { limit = 20, skip = 0 } = options;

    const query = {};
    if (filters.status) query.status = filters.status;
    if (filters.type) query.type = filters.type;
    if (filters.priority) query.priority = filters.priority;
    if (filters.assigned_to) query.assigned_to = new ObjectId(filters.assigned_to);

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

  /**
   * Count contacts by status
   */
  static async countByStatus(status) {
    const collection = await getCollection('contacts');
    return await collection.countDocuments({ status });
  }

  /**
   * Update contact
   */
  static async update(id, data) {
    const collection = await getCollection('contacts');

    const updateData = {
      ...data,
      updated_at: new Date()
    };

    await collection.updateOne(
      { _id: new ObjectId(id) },
      { $set: updateData }
    );

    return await this.findById(id);
  }

  /**
   * Assign contact to user
   */
  static async assign(id, userId) {
    return await this.update(id, {
      assigned_to: userId ? new ObjectId(userId) : null,
      status: 'assigned'
    });
  }

  /**
   * Mark contact as responded
   */
  static async markResponded(id, responseData) {
    return await this.update(id, {
      status: 'responded',
      response: {
        sent_at: new Date(),
        content: responseData.content,
        responder: responseData.responder
      }
    });
  }

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

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

    const [total, newCount, assignedCount, respondedCount, closedCount] = await Promise.all([
      collection.countDocuments(),
      collection.countDocuments({ status: 'new' }),
      collection.countDocuments({ status: 'assigned' }),
      collection.countDocuments({ status: 'responded' }),
      collection.countDocuments({ status: 'closed' })
    ]);

    // Type breakdown
    const typeBreakdown = await collection.aggregate([
      { $group: { _id: '$type', count: { $sum: 1 } } }
    ]).toArray();

    return {
      total,
      by_status: {
        new: newCount,
        assigned: assignedCount,
        responded: respondedCount,
        closed: closedCount
      },
      by_type: typeBreakdown.reduce((acc, item) => {
        acc[item._id] = item.count;
        return acc;
      }, {})
    };
  }
}

module.exports = Contact;