/**
 * Organization Model
 * Shared across all projects - tracks companies, institutions, media outlets
 */

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

class Organization {
  /**
   * Create a new organization
   */
  static async create(data) {
    const collection = await getCollection('organizations');

    const organization = {
      name: data.name,
      domain: data.domain || null, // Primary domain (e.g., "economist.com")
      type: data.type || 'other', // media, academic, corporate, nonprofit, government, other
      country: data.country || null,

      // Contact information
      contact_info: {
        website: data.contact_info?.website || null,
        email: data.contact_info?.email || null,
        phone: data.contact_info?.phone || null,
        address: data.contact_info?.address || null
      },

      // Metadata
      metadata: {
        industry: data.metadata?.industry || null,
        size: data.metadata?.size || null, // small, medium, large
        description: data.metadata?.description || null,
        notes: data.metadata?.notes || null
      },

      // Projects this organization has interacted with
      projects: data.projects || [], // ['tractatus', 'family-history', 'sydigital']

      // Relationship status
      relationship: {
        status: data.relationship?.status || 'prospect', // prospect, active, partner, archived
        since: data.relationship?.since || new Date(),
        tier: data.relationship?.tier || 'standard' // standard, priority, strategic
      },

      // Social/web presence
      social: {
        linkedin: data.social?.linkedin || null,
        twitter: data.social?.twitter || null,
        other: data.social?.other || {}
      },

      created_at: new Date(),
      updated_at: new Date()
    };

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

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

  /**
   * Find organization by name (case-insensitive)
   */
  static async findByName(name) {
    const collection = await getCollection('organizations');
    return await collection.findOne({
      name: { $regex: new RegExp(`^${name}$`, 'i') }
    });
  }

  /**
   * Find organization by domain
   */
  static async findByDomain(domain) {
    const collection = await getCollection('organizations');
    return await collection.findOne({ domain });
  }

  /**
   * Find or create organization
   */
  static async findOrCreate(data) {
    // Try to find by domain first (most reliable)
    if (data.domain) {
      const existing = await this.findByDomain(data.domain);
      if (existing) return existing;
    }

    // Try to find by name
    if (data.name) {
      const existing = await this.findByName(data.name);
      if (existing) return existing;
    }

    // Create new organization
    return await this.create(data);
  }

  /**
   * List organizations with filtering
   */
  static async list(filters = {}, options = {}) {
    const collection = await getCollection('organizations');
    const { limit = 50, skip = 0 } = options;

    const query = {};
    if (filters.type) query.type = filters.type;
    if (filters.country) query.country = filters.country;
    if (filters.project) query.projects = filters.project;
    if (filters.status) query['relationship.status'] = filters.status;
    if (filters.tier) query['relationship.tier'] = filters.tier;

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

  /**
   * Search organizations by name or domain
   */
  static async search(searchTerm, options = {}) {
    const collection = await getCollection('organizations');
    const { limit = 20 } = options;

    return await collection
      .find({
        $or: [
          { name: { $regex: searchTerm, $options: 'i' } },
          { domain: { $regex: searchTerm, $options: 'i' } },
          { 'contact_info.website': { $regex: searchTerm, $options: 'i' } }
        ]
      })
      .limit(limit)
      .toArray();
  }

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

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

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

    return await this.findById(id);
  }

  /**
   * Add project to organization
   */
  static async addProject(id, projectName) {
    const collection = await getCollection('organizations');

    await collection.updateOne(
      { _id: new ObjectId(id) },
      {
        $addToSet: { projects: projectName },
        $set: { updated_at: new Date() }
      }
    );

    return await this.findById(id);
  }

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

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

    const [total, byType, byStatus, byProject] = await Promise.all([
      collection.countDocuments(),
      collection.aggregate([
        { $group: { _id: '$type', count: { $sum: 1 } } }
      ]).toArray(),
      collection.aggregate([
        { $group: { _id: '$relationship.status', count: { $sum: 1 } } }
      ]).toArray(),
      collection.aggregate([
        { $unwind: '$projects' },
        { $group: { _id: '$projects', count: { $sum: 1 } } }
      ]).toArray()
    ]);

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

module.exports = Organization;