/**
 * Missed Breach Controller
 * 
 * Tracks governance framework false negatives for research integrity
 */

const MissedBreach = require('../models/MissedBreach.model');
const AuditLog = require('../models/AuditLog.model');

/**
 * Report a new missed breach
 * POST /api/admin/missed-breaches
 */
async function reportMissedBreach(req, res) {
  try {
    const {
      title,
      incidentDate,
      severity,
      description,
      activityType,
      missReason,
      missReasonDetails,
      linkedAuditLog,
      sessionId,
      actualCost,
      estimatedCost,
      environment,
      tags
    } = req.body;

    // Validate required fields
    if (!title || !incidentDate || !severity || !description || !activityType || !missReason) {
      return res.status(400).json({
        success: false,
        error: 'Missing required fields: title, incidentDate, severity, description, activityType, missReason'
      });
    }

    const missedBreach = new MissedBreach({
      title,
      incidentDate: new Date(incidentDate),
      severity,
      description,
      activityType,
      missReason,
      missReasonDetails,
      linkedAuditLog,
      sessionId,
      actualCost,
      estimatedCost,
      environment: environment || process.env.NODE_ENV || 'development',
      tags: tags || [],
      reportedBy: req.user?._id || null,
      status: 'REPORTED'
    });

    await missedBreach.save();

    res.status(201).json({
      success: true,
      missedBreach: missedBreach.toObject()
    });

  } catch (error) {
    console.error('Error reporting missed breach:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to report missed breach'
    });
  }
}

/**
 * Get all missed breaches
 * GET /api/admin/missed-breaches?status=VERIFIED&severity=HIGH
 */
async function getMissedBreaches(req, res) {
  try {
    const {
      status,
      severity,
      missReason,
      environment,
      startDate,
      endDate,
      limit = 100
    } = req.query;

    const query = {};

    if (status) query.status = status;
    if (severity) query.severity = severity;
    if (missReason) query.missReason = missReason;
    if (environment && environment !== 'all') query.environment = environment;

    if (startDate && endDate) {
      query.incidentDate = {
        $gte: new Date(startDate),
        $lte: new Date(endDate)
      };
    }

    const breaches = await MissedBreach.find(query)
      .sort({ incidentDate: -1 })
      .limit(parseInt(limit))
      .populate('reportedBy', 'name email')
      .populate('verifiedBy', 'name email')
      .lean();

    res.json({
      success: true,
      count: breaches.length,
      breaches
    });

  } catch (error) {
    console.error('Error fetching missed breaches:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to fetch missed breaches'
    });
  }
}

/**
 * Get missed breach statistics
 * GET /api/admin/missed-breaches/statistics
 */
async function getMissedBreachStatistics(req, res) {
  try {
    const { startDate, endDate } = req.query;

    const start = startDate ? new Date(startDate) : new Date(Date.now() - 30 * 24 * 60 * 60 * 1000);
    const end = endDate ? new Date(endDate) : new Date();

    // Get missed breach stats
    const missedStats = await MissedBreach.getStatistics(start, end);

    // Get audit log stats for comparison
    const auditStats = await AuditLog.getStatistics(start, end);

    // Calculate effectiveness rate
    const effectiveness = await MissedBreach.calculateEffectivenessRate(
      start,
      end,
      auditStats
    );

    // Get breakdown by reason
    const byReason = await MissedBreach.getBreakdownByReason(start, end);

    res.json({
      success: true,
      dateRange: { start, end },
      missedBreaches: missedStats,
      auditLogs: auditStats,
      effectiveness,
      breakdownByReason: byReason
    });

  } catch (error) {
    console.error('Error fetching missed breach statistics:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to fetch statistics'
    });
  }
}

/**
 * Update a missed breach (verify, remediate, etc.)
 * PATCH /api/admin/missed-breaches/:id
 */
async function updateMissedBreach(req, res) {
  try {
    const { id } = req.params;
    const updates = req.body;

    // If verifying, record who verified it
    if (updates.status === 'VERIFIED' && req.user) {
      updates.verifiedBy = req.user._id;
    }

    const missedBreach = await MissedBreach.findByIdAndUpdate(
      id,
      updates,
      { new: true, runValidators: true }
    );

    if (!missedBreach) {
      return res.status(404).json({
        success: false,
        error: 'Missed breach not found'
      });
    }

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

  } catch (error) {
    console.error('Error updating missed breach:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to update missed breach'
    });
  }
}

/**
 * Delete a missed breach (if it was a false positive)
 * DELETE /api/admin/missed-breaches/:id
 */
async function deleteMissedBreach(req, res) {
  try {
    const { id } = req.params;

    const missedBreach = await MissedBreach.findByIdAndDelete(id);

    if (!missedBreach) {
      return res.status(404).json({
        success: false,
        error: 'Missed breach not found'
      });
    }

    res.json({
      success: true,
      message: 'Missed breach deleted'
    });

  } catch (error) {
    console.error('Error deleting missed breach:', error);
    res.status(500).json({
      success: false,
      error: 'Failed to delete missed breach'
    });
  }
}

module.exports = {
  reportMissedBreach,
  getMissedBreaches,
  getMissedBreachStatistics,
  updateMissedBreach,
  deleteMissedBreach
};