/**
 * Unified Inbox Controller
 * Combines contact, media, and case submissions into single view
 */

const Contact = require('../models/Contact.model');
const MediaInquiry = require('../models/MediaInquiry.model');
const CaseSubmission = require('../models/CaseSubmission.model');

/**
 * Get unified inbox with all communication types
 */
async function getInbox(req, res) {
  try {
    const { 
      type,      // filter: contact, media, case, or all
      status,    // filter: new, pending, assigned, etc
      limit = 20,
      skip = 0
    } = req.query;

    const options = { 
      limit: parseInt(limit), 
      skip: parseInt(skip) 
    };

    const items = [];

    // Fetch contacts
    if (!type || type === 'all' || type === 'contact') {
      const contacts = status
        ? await Contact.findByStatus(status, options)
        : await Contact.list({}, options);
      
      items.push(...contacts.map(c => ({
        ...c,
        _type: 'contact',
        _displayStatus: c.status,
        _priority: c.priority || 'normal',
        _created: c.created_at
      })));
    }

    // Fetch media inquiries
    if (!type || type === 'all' || type === 'media') {
      const media = status
        ? await MediaInquiry.findByStatus(status, options)
        : await MediaInquiry.findByStatus('new', options);
      
      items.push(...media.map(m => ({
        ...m,
        _type: 'media',
        _displayStatus: m.status,
        _priority: m.ai_triage?.urgency || 'medium',
        _created: m.created_at
      })));
    }

    // Fetch case submissions
    if (!type || type === 'all' || type === 'case') {
      const cases = status
        ? await CaseSubmission.findByStatus(status, options)
        : await CaseSubmission.findByStatus('pending', options);
      
      items.push(...cases.map(c => ({
        ...c,
        _type: 'case',
        _displayStatus: c.moderation?.status || 'pending',
        _priority: c.ai_review?.relevance_score >= 0.7 ? 'high' : 'normal',
        _created: c.submitted_at
      })));
    }

    // Sort by created date (most recent first)
    items.sort((a, b) => new Date(b._created) - new Date(a._created));

    // Apply limit to combined results
    const paginatedItems = items.slice(0, options.limit);

    res.json({
      success: true,
      total: items.length,
      items: paginatedItems,
      hasMore: items.length > options.limit
    });

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

/**
 * Get unified inbox statistics
 */
async function getStats(req, res) {
  try {
    // Get statistics from all three sources
    const [contactStats, mediaStats, caseStats] = await Promise.all([
      Contact.getStats(),
      getMediaStats(),
      getCaseStats()
    ]);

    res.json({
      success: true,
      stats: {
        contacts: contactStats,
        media: mediaStats,
        cases: caseStats,
        total: {
          new: (contactStats.by_status.new || 0) + 
               (mediaStats.by_status.new || 0) + 
               (caseStats.by_status.pending || 0),
          assigned: (contactStats.by_status.assigned || 0) + 
                   (mediaStats.by_status.triaged || 0),
          responded: (contactStats.by_status.responded || 0) + 
                    (mediaStats.by_status.responded || 0),
          all: contactStats.total + mediaStats.total + caseStats.total
        }
      }
    });

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

/**
 * Helper: Get media inquiry statistics
 */
async function getMediaStats() {
  const [_total, newCount, triagedCount, respondedCount, closedCount] = await Promise.all([
    MediaInquiry.countByStatus('new'),
    MediaInquiry.countByStatus('new'),
    MediaInquiry.countByStatus('triaged'),
    MediaInquiry.countByStatus('responded'),
    MediaInquiry.countByStatus('closed')
  ]);

  // Get total by adding all status counts
  const totalSum = newCount + triagedCount + respondedCount + closedCount;

  return {
    total: totalSum,
    by_status: {
      new: newCount,
      triaged: triagedCount,
      responded: respondedCount,
      closed: closedCount
    }
  };
}

/**
 * Helper: Get case submission statistics
 */
async function getCaseStats() {
  const [pending, approved, rejected, needsInfo] = await Promise.all([
    CaseSubmission.countByStatus('pending'),
    CaseSubmission.countByStatus('approved'),
    CaseSubmission.countByStatus('rejected'),
    CaseSubmission.countByStatus('needs_info')
  ]);

  const total = pending + approved + rejected + needsInfo;

  return {
    total,
    by_status: {
      pending,
      approved,
      rejected,
      needs_info: needsInfo
    }
  };
}

module.exports = {
  getInbox,
  getStats
};