'use client';

import { useState, useEffect, use } from 'react';
import Link from 'next/link';
import { useRouter } from 'next/navigation';
import SidebarLayout from '../../../components/sidebar-layout';
import { 
  ArrowLeft, 
  Scan, 
  User, 
  Calendar,
  Eye,
  Edit,
  Trash2,
  XCircle,
  CheckCircle,
  AlertCircle
} from 'lucide-react';

interface OCTScan {
  _id: string;
  patientId: {
    _id: string;
    name: string;
    patientId: string;
    phone?: string;
    dateOfBirth?: string;
  };
  performedBy?: {
    _id: string;
    name: string;
  };
  scanDate: string;
  device?: string;
  scanType: string;
  protocol?: string;
  signalStrength?: number;
  OD?: {
    acquired: boolean;
    signalStrength?: number;
    macular?: {
      cmt?: number;
      avgThickness?: number;
      srf?: boolean;
      irf?: boolean;
      drusen?: boolean;
      epiretinalMembrane?: boolean;
    };
    opticNerve?: {
      rnflAverage?: number;
      rnflSuperior?: number;
      rnflInferior?: number;
      rnflNasal?: number;
      rnflTemporal?: number;
      gcipl?: {
        average?: number;
      };
    };
    interpretation?: string;
  };
  OS?: {
    acquired: boolean;
    signalStrength?: number;
    macular?: {
      cmt?: number;
      avgThickness?: number;
      srf?: boolean;
      irf?: boolean;
      drusen?: boolean;
      epiretinalMembrane?: boolean;
    };
    opticNerve?: {
      rnflAverage?: number;
      rnflSuperior?: number;
      rnflInferior?: number;
      rnflNasal?: number;
      rnflTemporal?: number;
      gcipl?: {
        average?: number;
      };
    };
    interpretation?: string;
  };
  interpretation?: string;
  notes?: string;
  createdAt: string;
}

export default function OCTScanDetailPage({ params }: { params: Promise<{ id: string }> }) {
  const { id } = use(params);
  const router = useRouter();
  const [scan, setScan] = useState<OCTScan | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState('');

  useEffect(() => {
    fetchScan();
  }, [id]);

  const fetchScan = async () => {
    try {
      const response = await fetch(`/api/imaging/oct/${id}`);
      if (response.ok) {
        const data = await response.json();
        setScan(data);
      } else {
        setError('OCT scan not found');
      }
    } catch (err) {
      console.error('Error fetching scan:', err);
      setError('Failed to load OCT scan');
    } finally {
      setLoading(false);
    }
  };

  const handleDelete = async () => {
    if (!confirm('Are you sure you want to delete this OCT scan?')) return;
    
    try {
      const response = await fetch(`/api/imaging/oct/${id}`, { method: 'DELETE' });
      if (response.ok) {
        router.push('/imaging/oct');
      } else {
        alert('Failed to delete scan');
      }
    } catch (err) {
      console.error('Error deleting scan:', err);
      alert('Failed to delete scan');
    }
  };

  const getScanTypeLabel = (type: string) => {
    const labels: Record<string, string> = {
      macula: 'Macular OCT',
      opticNerve: 'Optic Nerve / RNFL',
      anteriorSegment: 'Anterior Segment',
      widefield: 'Widefield',
      angio: 'OCT Angiography'
    };
    return labels[type] || type;
  };

  const renderEyeData = (eyeData: OCTScan['OD'], eyeLabel: string) => {
    if (!eyeData?.acquired) {
      return (
        <div className="p-4 bg-gray-50 rounded-lg text-center text-gray-500">
          Not acquired
        </div>
      );
    }

    return (
      <div className="space-y-4">
        {eyeData.macular && (
          <div className="bg-gray-50 rounded-lg p-4">
            <h4 className="font-medium text-gray-900 mb-3">Macular Analysis</h4>
            <div className="grid grid-cols-2 gap-3 text-sm">
              {eyeData.macular.cmt !== undefined && (
                <div>
                  <span className="text-gray-500">CMT:</span>
                  <span className="ml-2 font-medium">{eyeData.macular.cmt} µm</span>
                </div>
              )}
              {eyeData.macular.avgThickness !== undefined && (
                <div>
                  <span className="text-gray-500">Avg Thickness:</span>
                  <span className="ml-2 font-medium">{eyeData.macular.avgThickness} µm</span>
                </div>
              )}
            </div>
            <div className="flex flex-wrap gap-2 mt-3">
              {eyeData.macular.srf && (
                <span className="px-2 py-1 bg-red-100 text-red-700 rounded text-xs">SRF</span>
              )}
              {eyeData.macular.irf && (
                <span className="px-2 py-1 bg-red-100 text-red-700 rounded text-xs">IRF</span>
              )}
              {eyeData.macular.drusen && (
                <span className="px-2 py-1 bg-yellow-100 text-yellow-700 rounded text-xs">Drusen</span>
              )}
              {eyeData.macular.epiretinalMembrane && (
                <span className="px-2 py-1 bg-orange-100 text-orange-700 rounded text-xs">ERM</span>
              )}
            </div>
          </div>
        )}

        {eyeData.opticNerve && (
          <div className="bg-gray-50 rounded-lg p-4">
            <h4 className="font-medium text-gray-900 mb-3">RNFL Analysis</h4>
            <div className="grid grid-cols-2 gap-3 text-sm">
              {eyeData.opticNerve.rnflAverage !== undefined && (
                <div>
                  <span className="text-gray-500">RNFL Average:</span>
                  <span className="ml-2 font-medium">{eyeData.opticNerve.rnflAverage} µm</span>
                </div>
              )}
              {eyeData.opticNerve.gcipl?.average !== undefined && (
                <div>
                  <span className="text-gray-500">GCL Average:</span>
                  <span className="ml-2 font-medium">{eyeData.opticNerve.gcipl.average} µm</span>
                </div>
              )}
            </div>
            {(eyeData.opticNerve.rnflSuperior || eyeData.opticNerve.rnflInferior) && (
              <div className="grid grid-cols-4 gap-2 mt-3 text-xs">
                <div className="text-center p-2 bg-white rounded">
                  <div className="text-gray-500">Superior</div>
                  <div className="font-medium">{eyeData.opticNerve.rnflSuperior || '-'}</div>
                </div>
                <div className="text-center p-2 bg-white rounded">
                  <div className="text-gray-500">Inferior</div>
                  <div className="font-medium">{eyeData.opticNerve.rnflInferior || '-'}</div>
                </div>
                <div className="text-center p-2 bg-white rounded">
                  <div className="text-gray-500">Nasal</div>
                  <div className="font-medium">{eyeData.opticNerve.rnflNasal || '-'}</div>
                </div>
                <div className="text-center p-2 bg-white rounded">
                  <div className="text-gray-500">Temporal</div>
                  <div className="font-medium">{eyeData.opticNerve.rnflTemporal || '-'}</div>
                </div>
              </div>
            )}
          </div>
        )}

        {eyeData.interpretation && (
          <div>
            <p className="text-sm text-gray-500">Interpretation</p>
            <p className="text-gray-700">{eyeData.interpretation}</p>
          </div>
        )}
      </div>
    );
  };

  if (loading) {
    return (
      <SidebarLayout title="OCT Scan Details" description="Loading...">
        <div className="flex items-center justify-center h-64">
          <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-teal-600"></div>
        </div>
      </SidebarLayout>
    );
  }

  if (error || !scan) {
    return (
      <SidebarLayout title="OCT Scan Details" description="Error">
        <div className="max-w-4xl mx-auto">
          <Link href="/imaging/oct" className="inline-flex items-center gap-2 text-gray-600 hover:text-gray-900 mb-6">
            <ArrowLeft className="h-4 w-4" />
            Back to OCT Scans
          </Link>
          <div className="bg-red-50 border border-red-200 rounded-lg p-6 text-center">
            <XCircle className="h-12 w-12 text-red-500 mx-auto mb-4" />
            <h2 className="text-lg font-semibold text-red-800">{error || 'Scan not found'}</h2>
          </div>
        </div>
      </SidebarLayout>
    );
  }

  return (
    <SidebarLayout title="OCT Scan Details" description={getScanTypeLabel(scan.scanType)}>
      <div className="max-w-4xl mx-auto">
        <div className="mb-6 flex items-center justify-between">
          <Link href="/imaging/oct" className="inline-flex items-center gap-2 text-gray-600 hover:text-gray-900">
            <ArrowLeft className="h-4 w-4" />
            Back to OCT Scans
          </Link>
          <div className="flex gap-2">
            <button
              onClick={handleDelete}
              className="inline-flex items-center gap-2 px-4 py-2 bg-red-600 text-white rounded-lg hover:bg-red-700"
            >
              <Trash2 className="h-4 w-4" />
              Delete
            </button>
          </div>
        </div>

        {/* Header */}
        <div className="bg-white rounded-xl shadow-sm border border-gray-100 p-6 mb-6">
          <div className="flex items-start justify-between mb-4">
            <div>
              <h1 className="text-2xl font-bold text-gray-900 flex items-center gap-2">
                <Scan className="h-6 w-6 text-teal-600" />
                {getScanTypeLabel(scan.scanType)}
              </h1>
              {scan.device && <p className="text-gray-500 mt-1">Device: {scan.device}</p>}
            </div>
          </div>

          <div className="grid grid-cols-2 md:grid-cols-4 gap-4 mt-6">
            <div className="flex items-center gap-3">
              <Calendar className="h-5 w-5 text-gray-400" />
              <div>
                <p className="text-xs text-gray-500">Scan Date</p>
                <p className="font-medium">{new Date(scan.scanDate).toLocaleDateString()}</p>
              </div>
            </div>
            <div className="flex items-center gap-3">
              <Eye className="h-5 w-5 text-gray-400" />
              <div>
                <p className="text-xs text-gray-500">Eyes Scanned</p>
                <p className="font-medium">
                  {scan.OD?.acquired && scan.OS?.acquired ? 'OU (Both)' : 
                   scan.OD?.acquired ? 'OD (Right)' : 
                   scan.OS?.acquired ? 'OS (Left)' : 'None'}
                </p>
              </div>
            </div>
            {scan.performedBy && (
              <div className="flex items-center gap-3">
                <User className="h-5 w-5 text-gray-400" />
                <div>
                  <p className="text-xs text-gray-500">Performed By</p>
                  <p className="font-medium">{scan.performedBy.name}</p>
                </div>
              </div>
            )}
          </div>
        </div>

        {/* Patient Info */}
        <div className="bg-white rounded-xl shadow-sm border border-gray-100 p-6 mb-6">
          <h2 className="text-lg font-semibold text-gray-900 mb-4 flex items-center gap-2">
            <User className="h-5 w-5 text-teal-600" />
            Patient
          </h2>
          <div className="grid grid-cols-2 md:grid-cols-3 gap-4">
            <div>
              <p className="text-sm text-gray-500">Name</p>
              <Link href={`/patients/${scan.patientId._id}`} className="font-medium text-teal-600 hover:text-teal-700">
                {scan.patientId.name}
              </Link>
            </div>
            <div>
              <p className="text-sm text-gray-500">Patient ID</p>
              <p className="font-medium">{scan.patientId.patientId}</p>
            </div>
            {scan.patientId.phone && (
              <div>
                <p className="text-sm text-gray-500">Phone</p>
                <p className="font-medium">{scan.patientId.phone}</p>
              </div>
            )}
          </div>
        </div>

        {/* Eye Data */}
        <div className="grid grid-cols-1 md:grid-cols-2 gap-6 mb-6">
          <div className="bg-white rounded-xl shadow-sm border border-gray-100 p-6">
            <h2 className="text-lg font-semibold text-gray-900 mb-4 flex items-center gap-2">
              <Eye className="h-5 w-5 text-teal-600" />
              OD (Right Eye)
            </h2>
            {renderEyeData(scan.OD, 'OD')}
          </div>

          <div className="bg-white rounded-xl shadow-sm border border-gray-100 p-6">
            <h2 className="text-lg font-semibold text-gray-900 mb-4 flex items-center gap-2">
              <Eye className="h-5 w-5 text-teal-600" />
              OS (Left Eye)
            </h2>
            {renderEyeData(scan.OS, 'OS')}
          </div>
        </div>

        {/* Interpretation */}
        {scan.interpretation && (
          <div className="bg-white rounded-xl shadow-sm border border-gray-100 p-6 mb-6">
            <h2 className="text-lg font-semibold text-gray-900 mb-4">Overall Interpretation</h2>
            <p className="text-gray-700 whitespace-pre-wrap">{scan.interpretation}</p>
          </div>
        )}

        {/* Notes */}
        {scan.notes && (
          <div className="bg-white rounded-xl shadow-sm border border-gray-100 p-6 mb-6">
            <h2 className="text-lg font-semibold text-gray-900 mb-4">Notes</h2>
            <p className="text-gray-700 whitespace-pre-wrap">{scan.notes}</p>
          </div>
        )}

        {/* Metadata */}
        <div className="text-sm text-gray-500 text-center">
          <p>Created: {new Date(scan.createdAt).toLocaleString()}</p>
        </div>
      </div>
    </SidebarLayout>
  );
}