/**
 * CRM Controller
 * Multi-project CRM system for contacts, organizations, activities, and SLAs
 */

const UnifiedContact = require('../models/UnifiedContact.model');
const Organization = require('../models/Organization.model');
const ActivityTimeline = require('../models/ActivityTimeline.model');
const ResponseTemplate = require('../models/ResponseTemplate.model');
const SLATracking = require('../models/SLATracking.model');

/**
 * Get CRM dashboard statistics
 */
async function getDashboardStats(req, res) {
  try {
    const [contactStats, orgStats, slaStats, templateStats] = await Promise.all([
      UnifiedContact.getStats(),
      Organization.getStats(),
      SLATracking.getStats({ project: 'tractatus' }),
      ResponseTemplate.getStats()
    ]);

    res.json({
      success: true,
      stats: {
        contacts: contactStats,
        organizations: orgStats,
        sla: slaStats,
        templates: templateStats
      }
    });

  } catch (error) {
    console.error('CRM dashboard stats error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to load dashboard statistics'
    });
  }
}

/**
 * List unified contacts
 */
async function listContacts(req, res) {
  try {
    const { project, status, tag, organization_id, limit = 50, skip = 0 } = req.query;

    const filters = {};
    if (project) filters.project = project;
    if (status) filters.status = status;
    if (tag) filters.tag = tag;
    if (organization_id) filters.organization_id = organization_id;

    const contacts = await UnifiedContact.list(filters, {
      limit: parseInt(limit),
      skip: parseInt(skip)
    });

    res.json({
      success: true,
      total: contacts.length,
      contacts
    });

  } catch (error) {
    console.error('List contacts error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to list contacts'
    });
  }
}

/**
 * Get single contact with full details
 */
async function getContact(req, res) {
  try {
    const { id } = req.params;

    const contact = await UnifiedContact.findById(id);
    if (!contact) {
      return res.status(404).json({
        success: false,
        error: 'Contact not found'
      });
    }

    // Get organization if linked
    let organization = null;
    if (contact.organization_id) {
      organization = await Organization.findById(contact.organization_id);
    }

    // Get activity timeline
    const activities = await ActivityTimeline.getByContact(id, { limit: 50 });

    res.json({
      success: true,
      contact,
      organization,
      activities
    });

  } catch (error) {
    console.error('Get contact error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to load contact'
    });
  }
}

/**
 * List organizations
 */
async function listOrganizations(req, res) {
  try {
    const { type, country, project, status, tier, limit = 50, skip = 0 } = req.query;

    const filters = {};
    if (type) filters.type = type;
    if (country) filters.country = country;
    if (project) filters.project = project;
    if (status) filters.status = status;
    if (tier) filters.tier = tier;

    const organizations = await Organization.list(filters, {
      limit: parseInt(limit),
      skip: parseInt(skip)
    });

    res.json({
      success: true,
      total: organizations.length,
      organizations
    });

  } catch (error) {
    console.error('List organizations error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to list organizations'
    });
  }
}

/**
 * Get single organization with contacts and activity
 */
async function getOrganization(req, res) {
  try {
    const { id } = req.params;

    const organization = await Organization.findById(id);
    if (!organization) {
      return res.status(404).json({
        success: false,
        error: 'Organization not found'
      });
    }

    // Get contacts at this organization
    const contacts = await UnifiedContact.findByOrganization(id, { limit: 100 });

    // Get activity timeline
    const activities = await ActivityTimeline.getByOrganization(id, { limit: 50 });

    res.json({
      success: true,
      organization,
      contacts,
      activities
    });

  } catch (error) {
    console.error('Get organization error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to load organization'
    });
  }
}

/**
 * Get SLA dashboard
 */
async function getSLADashboard(req, res) {
  try {
    const { project = 'tractatus' } = req.query;

    const [stats, pending, approaching, breached] = await Promise.all([
      SLATracking.getStats({ project }),
      SLATracking.getPending({ project, limit: 20 }),
      SLATracking.getApproachingBreach({ project }),
      SLATracking.getBreached({ project, limit: 20 })
    ]);

    res.json({
      success: true,
      stats,
      pending,
      approaching_breach: approaching,
      breached
    });

  } catch (error) {
    console.error('SLA dashboard error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to load SLA dashboard'
    });
  }
}

/**
 * List response templates
 */
async function listTemplates(req, res) {
  try {
    const { category, language, project, tag, limit = 50, skip = 0 } = req.query;

    const filters = {};
    if (category) filters.category = category;
    if (language) filters.language = language;
    if (project) filters.project = project;
    if (tag) filters.tag = tag;

    const templates = await ResponseTemplate.list(filters, {
      limit: parseInt(limit),
      skip: parseInt(skip)
    });

    res.json({
      success: true,
      total: templates.length,
      templates
    });

  } catch (error) {
    console.error('List templates error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to list templates'
    });
  }
}

/**
 * Render template with variables
 */
async function renderTemplate(req, res) {
  try {
    const { id } = req.params;
    const { variables } = req.body;

    const rendered = await ResponseTemplate.render(id, variables || {});

    res.json({
      success: true,
      rendered
    });

  } catch (error) {
    console.error('Render template error:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to render template'
    });
  }
}

module.exports = {
  getDashboardStats,
  listContacts,
  getContact,
  listOrganizations,
  getOrganization,
  getSLADashboard,
  listTemplates,
  renderTemplate
};