import React, { useState, useEffect } from 'react';
import { useParams, useNavigate } from 'react-router-dom';
import { Container, Card, CardContent, Typography, Box, Button } from '@mui/material';
import Swal from 'sweetalert2';
import NavbarUpload from '../ComponentUtils/Headers/NavbarUpload';
import Footer from '../ComponentUtils/Footer';
import Loading from '../ComponentUtils/LoadingAnimation/Loading';
import ImageGalleryCard from '../ComponentUtils/ImageGalleryCard';
import ConsentBadges from '../ComponentUtils/ConsentBadges';
import MultiImageDropzone from '../ComponentUtils/MultiUpload/MultiImageDropzone';
import ImageDescriptionManager from '../ComponentUtils/ImageDescriptionManager';
import GroupMetadataEditor from '../ComponentUtils/GroupMetadataEditor';
import ConsentManager from '../ComponentUtils/ConsentManager';
import DeleteGroupButton from '../ComponentUtils/DeleteGroupButton';

/**
 * ManagementPortalPage - Self-service management for uploaded groups
 * 
 * Modulare Struktur mit individuellen Komponenten:
 * - ImageDescriptionManager: Bildbeschreibungen bearbeiten
 * - GroupMetadataEditor: Gruppenmetadaten bearbeiten
 * - ConsentManager: Einwilligungen verwalten
 * - DeleteGroupButton: Gruppe löschen
 */
function ManagementPortalPage() {
  const { token } = useParams();
  const navigate = useNavigate();
  
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);
  const [group, setGroup] = useState(null);

  // Load group data
  const loadGroup = async () => {
    try {
      setLoading(true);
      setError(null);
      
      const res = await fetch(`/api/manage/${token}`);
      
      if (res.status === 404) {
        setError('Ungültiger oder abgelaufener Verwaltungslink');
        return;
      }
      
      if (res.status === 429) {
        setError('Zu viele Anfragen. Bitte versuchen Sie es später erneut.');
        return;
      }
      
      if (!res.ok) {
        throw new Error('Fehler beim Laden der Gruppe');
      }
      
      const response = await res.json();
      const data = response.data || response;
      
      // Transform data
      const transformedData = {
        ...data,
        displayInWorkshop: data.displayInWorkshop || data.display_in_workshop,
        consentTimestamp: data.consentTimestamp || data.consent_timestamp,
        consents: {
          workshopConsent: (data.displayInWorkshop === 1 || data.display_in_workshop === 1),
          socialMediaConsents: (data.socialMediaConsents || [])
            .filter(c => c.consented === 1 && c.revoked === 0)
            .map(c => ({ platformId: c.platform_id, consented: true }))
        },
        metadata: {
          year: data.year || new Date().getFullYear(),
          title: data.title || '',
          description: data.description || '',
          name: data.name || ''
        },
        images: (data.images || []).map(img => ({
          ...img,
          remoteUrl: `/download/${img.fileName}`,
          originalName: img.originalName || img.fileName,
          id: img.id,
          imageDescription: img.imageDescription || ''
        }))
      };
      
      setGroup(transformedData);
      
    } catch (e) {
      console.error('Error loading group:', e);
      setError('Fehler beim Laden der Gruppe');
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    if (token) {
      loadGroup();
    }
  }, [token]); // eslint-disable-line react-hooks/exhaustive-deps

  // Handle adding new images
  const handleImagesSelected = async (newImages) => {
    try {
      const formData = new FormData();
      newImages.forEach(file => {
        formData.append('images', file);
      });

      const res = await fetch(`/api/manage/${token}/images`, {
        method: 'POST',
        body: formData
      });

      if (!res.ok) {
        const body = await res.json().catch(() => ({}));
        throw new Error(body.error || 'Fehler beim Hochladen');
      }

      await Swal.fire({
        icon: 'success',
        title: 'Bilder hinzugefügt',
        text: `${newImages.length} Bild(er) wurden erfolgreich hinzugefügt.`,
        timer: 2000,
        showConfirmButton: false
      });

      // Reload group data
      await loadGroup();

    } catch (error) {
      console.error('Error adding images:', error);
      Swal.fire({
        icon: 'error',
        title: 'Fehler',
        text: error.message || 'Bilder konnten nicht hinzugefügt werden'
      });
    }
  };

  const handleReorder = async (newOrder) => {
    if (!group || !group.groupId) {
      console.error('No groupId available for reordering');
      return;
    }

    try {
      const imageIds = newOrder.map(img => img.id);
      
      // Use token-based management API
      const response = await fetch(`/api/manage/${token}/reorder`, {
        method: 'PUT',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({ imageIds: imageIds })
      });

      if (!response.ok) {
        throw new Error('Reihenfolge konnte nicht gespeichert werden');
      }

      await Swal.fire({
        icon: 'success',
        title: 'Gespeichert',
        text: 'Die neue Reihenfolge wurde gespeichert.',
        timer: 1500,
        showConfirmButton: false
      });

      await loadGroup();
    } catch (error) {
      console.error('Error reordering images:', error);
      Swal.fire({
        icon: 'error',
        title: 'Fehler',
        text: error.message || 'Reihenfolge konnte nicht gespeichert werden'
      });
    }
  };

  if (loading) {
    return (
      <div className="allContainer">
        <NavbarUpload />
        <Container maxWidth="lg" sx={{ pt: '20px', pb: '40px', minHeight: '80vh', display: 'flex', justifyContent: 'center', alignItems: 'center' }}>
          <Loading />
        </Container>
        <Footer />
      </div>
    );
  }

  if (error) {
    return (
      <div className="allContainer">
        <NavbarUpload />
        <Container maxWidth="lg" sx={{ pt: '20px', pb: '40px', minHeight: '80vh' }}>
          <Card sx={{ borderRadius: '12px', boxShadow: '0 4px 12px rgba(0,0,0,0.1)', p: '20px', textAlign: 'center' }}>
            <Typography variant="h5" color="error" gutterBottom>
              {error}
            </Typography>
            <Typography variant="body1" color="text.secondary" sx={{ mb: 3 }}>
              {error}
            </Typography>
            <Button variant="contained" onClick={() => navigate('/')}>
              Zur Startseite
            </Button>
          </Card>
        </Container>
        <Footer />
      </div>
    );
  }

  return (
    <div className="allContainer">
      <NavbarUpload />

      <Container maxWidth="lg" sx={{ pt: '20px', pb: '40px', minHeight: '80vh' }}>
        <Card sx={{ borderRadius: '12px', boxShadow: '0 4px 12px rgba(0,0,0,0.1)', p: '20px', mb: '20px' }}>
          <CardContent>
            <Typography sx={{ fontFamily: 'roboto', fontWeight: 400, fontSize: '28px', textAlign: 'center', mb: '10px', color: '#333333' }}>
              Mein Upload verwalten
            </Typography>
            <Typography sx={{ fontFamily: 'roboto', fontWeight: 300, fontSize: '16px', color: '#666666', textAlign: 'center', mb: '30px' }}>
              Hier können Sie Ihre hochgeladenen Bilder verwalten, Metadaten bearbeiten und Einwilligungen ändern.
            </Typography>

            {/* Group Overview */}
            {group && (
              <Box sx={{ mb: 3 }}>
                <ImageGalleryCard 
                  item={group} 
                  showActions={false}
                  isPending={!group.approved}
                  mode="group"
                  hidePreview={true}
                />
                
                <Box sx={{ mt: 2 }}>
                  <Typography variant="subtitle2" gutterBottom sx={{ fontWeight: 600 }}>
                    Erteilte Einwilligungen:
                  </Typography>
                  <ConsentBadges group={group} />
                </Box>
              </Box>
            )}

            {/* Add Images Dropzone */}
            <Box sx={{ mb: 3 }}>
              <Typography variant="h6" gutterBottom sx={{ fontWeight: 600 }}>
                Weitere Bilder hinzufügen
              </Typography>
              <MultiImageDropzone 
                onImagesSelected={handleImagesSelected}
                selectedImages={[]}
              />
            </Box>

            {/* Image Descriptions Manager */}
            {group && group.images && group.images.length > 0 && (
              <Box sx={{ mb: 3 }}>
                <ImageDescriptionManager 
                  images={group.images}
                  token={token}
                  enableReordering={true}
                  onReorder={handleReorder}
                  onRefresh={loadGroup}
                />
              </Box>
            )}

            {/* Group Metadata Editor */}
            {group && (
              <Box sx={{ mb: 3 }}>
                <GroupMetadataEditor 
                  initialMetadata={group.metadata}
                  token={token}
                  onRefresh={loadGroup}
                />
              </Box>
            )}

            {/* Consent Manager */}
            {group && (
              <Box sx={{ mb: 3 }}>
                <ConsentManager 
                  initialConsents={group.consents}
                  token={token}
                  groupId={group.groupId}
                  onRefresh={loadGroup}
                />
              </Box>
            )}

            {/* Delete Group Button */}
            {group && (
              <Box sx={{ mt: 4, display: 'flex', justifyContent: 'center' }}>
                <DeleteGroupButton 
                  token={token}
                  groupName={group.title || group.name || 'diese Gruppe'}
                />
              </Box>
            )}
          </CardContent>
        </Card>
      </Container>

      <div className="footerContainer">
        <Footer />
      </div>
    </div>
  );
}

export default ManagementPortalPage;