'use client';

import { useState } from 'react';
import { X, AlertTriangle, Layers, Calendar, Target, User, Lightbulb, FileText } from 'lucide-react';
import type { IssueItem, SpanItem } from '../types';
import { DOMAIN_LABELS, INTENSITY_LABELS, VALENCE_LABELS, VALENCE_COLORS } from '../types';
import { useIssueSpans } from '@/hooks/useReviewIQAnalytics';
import { ReviewModal } from './ReviewModal';

interface IssueDetailModalProps {
  issue: IssueItem;
  onClose: () => void;
}

/**
 * Modal showing issue details and related spans.
 */
export function IssueDetailModal({ issue, onClose }: IssueDetailModalProps) {
  const { data: spans, loading, error } = useIssueSpans(issue.issue_id);
  const [selectedReview, setSelectedReview] = useState<{
    reviewId: string;
    spanId: string;
  } | null>(null);

  return (
    <div
      className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center z-50 p-4"
      onClick={onClose}
    >
      <div
        className="bg-white rounded-2xl shadow-2xl max-w-3xl w-full max-h-[90vh] overflow-y-auto"
        onClick={(e) => e.stopPropagation()}
      >
        {/* Header */}
        <div className="sticky top-0 bg-white border-b-2 border-gray-200 px-6 py-4 rounded-t-2xl">
          <div className="flex items-center justify-between">
            <div className="flex items-center gap-3">
              <AlertTriangle className="w-6 h-6 text-orange-600" />
              <div>
                <h3 className="text-xl font-bold text-gray-900">
                  {issue.subcode_name || issue.primary_subcode}
                </h3>
                <span className="text-sm font-mono text-gray-500">{issue.primary_subcode}</span>
              </div>
              <span
                className={`px-2 py-1 text-xs font-bold rounded border ${
                  issue.state === 'open'
                    ? 'bg-red-100 text-red-800 border-red-300'
                    : issue.state === 'resolved'
                    ? 'bg-green-100 text-green-800 border-green-300'
                    : 'bg-gray-100 text-gray-800 border-gray-300'
                }`}
              >
                {issue.state.toUpperCase()}
              </span>
            </div>
            <button
              onClick={onClose}
              className="p-2 hover:bg-gray-100 rounded-full transition-colors"
            >
              <X className="w-5 h-5 text-gray-600" />
            </button>
          </div>
        </div>

        {/* Content */}
        <div className="p-6 space-y-6">
          {/* Issue Info Grid */}
          <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
            <div className="bg-purple-50 rounded-lg p-4 border border-purple-200">
              <div className="flex items-center gap-2 mb-1">
                <Target className="w-4 h-4 text-purple-600" />
                <span className="text-xs font-semibold text-purple-700">URT Code</span>
              </div>
              <span className="text-lg font-mono font-bold text-purple-900">
                {issue.primary_subcode}
              </span>
            </div>

            <div className="bg-blue-50 rounded-lg p-4 border border-blue-200">
              <div className="flex items-center gap-2 mb-1">
                <Layers className="w-4 h-4 text-blue-600" />
                <span className="text-xs font-semibold text-blue-700">Domain</span>
              </div>
              <span className="text-lg font-bold text-blue-900">
                {DOMAIN_LABELS[issue.domain] || issue.domain}
              </span>
            </div>

            <div className="bg-orange-50 rounded-lg p-4 border border-orange-200">
              <div className="flex items-center gap-2 mb-1">
                <AlertTriangle className="w-4 h-4 text-orange-600" />
                <span className="text-xs font-semibold text-orange-700">Priority</span>
              </div>
              <span className="text-lg font-bold text-orange-900">
                {(issue.priority_score * 100).toFixed(0)}%
              </span>
            </div>

            <div className="bg-gray-50 rounded-lg p-4 border border-gray-200">
              <div className="flex items-center gap-2 mb-1">
                <Calendar className="w-4 h-4 text-gray-600" />
                <span className="text-xs font-semibold text-gray-700">Intensity</span>
              </div>
              <span className="text-lg font-bold text-gray-900">
                {issue.max_intensity
                  ? INTENSITY_LABELS[issue.max_intensity] || issue.max_intensity
                  : 'N/A'}
              </span>
            </div>
          </div>

          {/* Entity */}
          {issue.entity && (
            <div className="bg-gray-50 rounded-lg p-4 border border-gray-200">
              <span className="text-sm font-semibold text-gray-700">Related Entity</span>
              <p className="text-lg font-medium text-gray-900 mt-1">{issue.entity}</p>
            </div>
          )}

          {/* Solution & Owner Section */}
          {(issue.solution || issue.default_owner) && (
            <div className="bg-green-50 rounded-lg p-4 border border-green-200 space-y-3">
              {issue.solution && (
                <div>
                  <div className="flex items-center gap-2 mb-2">
                    <Lightbulb className="w-5 h-5 text-green-600" />
                    <span className="text-sm font-bold text-green-800">Recommended Solution</span>
                    {issue.solution_complexity && (
                      <span className={`ml-auto text-xs font-bold px-2 py-1 rounded ${
                        issue.solution_complexity === 'low'
                          ? 'bg-green-100 text-green-700'
                          : issue.solution_complexity === 'medium'
                          ? 'bg-yellow-100 text-yellow-700'
                          : 'bg-red-100 text-red-700'
                      }`}>
                        {issue.solution_complexity.charAt(0).toUpperCase() + issue.solution_complexity.slice(1)} Complexity
                      </span>
                    )}
                  </div>
                  <p className="text-gray-700 leading-relaxed">{issue.solution}</p>
                </div>
              )}

              {issue.default_owner && (
                <div className="flex items-center gap-2 pt-2 border-t border-green-200">
                  <User className="w-4 h-4 text-green-600" />
                  <span className="text-sm text-green-800">
                    <span className="font-medium">Assign to:</span>{' '}
                    <span className="font-bold">{issue.default_owner}</span>
                  </span>
                </div>
              )}
            </div>
          )}

          {/* Related Spans */}
          <div>
            <div className="flex items-center justify-between mb-4">
              <h4 className="text-lg font-bold text-gray-900">
                Related Spans ({issue.span_count})
              </h4>
            </div>

            {loading ? (
              <div className="flex items-center justify-center h-32 text-gray-500">
                <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600" />
              </div>
            ) : error ? (
              <div className="flex items-center justify-center h-32 text-red-500">
                Failed to load spans: {error}
              </div>
            ) : spans.length === 0 ? (
              <div className="flex items-center justify-center h-32 text-gray-500">
                No spans found for this issue
              </div>
            ) : (
              <div className="space-y-3 max-h-96 overflow-y-auto">
                {spans.map((span: SpanItem) => (
                  <div
                    key={span.span_id}
                    className="bg-gray-50 rounded-lg p-4 border border-gray-200"
                  >
                    <div className="flex items-start justify-between gap-4">
                      <p className="text-gray-800 flex-1">{span.span_text}</p>
                      <div className="flex items-center gap-2 flex-shrink-0">
                        {span.valence && (
                          <span
                            className="px-2 py-1 text-xs font-bold rounded"
                            style={{
                              backgroundColor: `${VALENCE_COLORS[span.valence]}20`,
                              color: VALENCE_COLORS[span.valence],
                            }}
                          >
                            {VALENCE_LABELS[span.valence] || span.valence}
                          </span>
                        )}
                        {span.intensity && (
                          <span className="px-2 py-1 bg-gray-200 text-gray-700 text-xs font-bold rounded">
                            {INTENSITY_LABELS[span.intensity] || span.intensity}
                          </span>
                        )}
                      </div>
                    </div>
                    <div className="flex items-center justify-between gap-4 mt-2">
                      <div className="flex items-center gap-4 text-xs text-gray-500">
                        {span.urt_primary && (
                          <span className="font-mono">{span.urt_primary}</span>
                        )}
                        {span.review_time && (
                          <span>{new Date(span.review_time).toLocaleDateString()}</span>
                        )}
                        {span.entity && <span>Entity: {span.entity}</span>}
                      </div>
                      {/* View Full Review Button */}
                      {span.source_review_id && (
                        <button
                          onClick={() =>
                            setSelectedReview({
                              reviewId: span.source_review_id!,
                              spanId: span.span_id,
                            })
                          }
                          className="inline-flex items-center gap-1 px-2 py-1 text-xs font-semibold text-blue-600 hover:bg-blue-50 rounded transition-colors"
                        >
                          <FileText className="w-3 h-3" />
                          View Review
                        </button>
                      )}
                    </div>
                  </div>
                ))}
              </div>
            )}
          </div>
        </div>

        {/* Footer */}
        <div className="sticky bottom-0 bg-white border-t-2 border-gray-200 px-6 py-4 rounded-b-2xl">
          <button
            onClick={onClose}
            className="w-full py-3 bg-gray-900 text-white rounded-lg font-semibold hover:bg-gray-800 transition-colors"
          >
            Close
          </button>
        </div>
      </div>

      {/* Review Modal for drill-down */}
      {selectedReview && (
        <ReviewModal
          reviewId={selectedReview.reviewId}
          highlightSpanId={selectedReview.spanId}
          onClose={() => setSelectedReview(null)}
        />
      )}
    </div>
  );
}