import { useEffect, useState } from 'react';
import { Link } from 'react-router-dom';
import { getTeamDashboardData, getReferenceData } from '../services/api';
import type { TeamDashboardData, TeamDashboardCluster, ApplicationStatus, ReferenceValue } from '../types';

const ALL_STATUSES: ApplicationStatus[] = [
  'In Production',
  'Implementation',
  'Proof of Concept',
  'End of support',
  'End of life',
  'Deprecated',
  'Shadow IT',
  'Closed',
  'Undefined',
];

type SortOption = 'alphabetical' | 'fte-descending';

// Color scheme for governance models - matches exact names from Jira Assets
const GOVERNANCE_MODEL_COLORS: Record<string, { bg: string; text: string; letter: string }> = {
  'Regiemodel A': { bg: '#20556B', text: '#FFFFFF', letter: 'A' },
  'Regiemodel B': { bg: '#286B86', text: '#FFFFFF', letter: 'B' },
  'Regiemodel B+': { bg: '#286B86', text: '#FFFFFF', letter: 'B+' },
  'Regiemodel C': { bg: '#81CBF2', text: '#20556B', letter: 'C' },
  'Regiemodel D': { bg: '#F5A733', text: '#FFFFFF', letter: 'D' },
  'Regiemodel E': { bg: '#E95053', text: '#FFFFFF', letter: 'E' },
  'Niet ingesteld': { bg: '#EEEEEE', text: '#AAAAAA', letter: '?' },
};

// Get governance model colors and letter - with fallback for unknown models
const getGovernanceModelStyle = (governanceModelName: string | null | undefined) => {
  const name = governanceModelName || 'Niet ingesteld';
  
  // First try exact match
  if (GOVERNANCE_MODEL_COLORS[name]) {
    return GOVERNANCE_MODEL_COLORS[name];
  }
  
  // Try to match by pattern (e.g., "Regiemodel X" -> letter X)
  const match = name.match(/Regiemodel\s+(.+)/i);
  if (match) {
    const letter = match[1];
    // Return a color based on the letter
    if (letter === 'A') return { bg: '#20556B', text: '#FFFFFF', letter: 'A' };
    if (letter === 'B') return { bg: '#286B86', text: '#FFFFFF', letter: 'B' };
    if (letter === 'B+') return { bg: '#286B86', text: '#FFFFFF', letter: 'B+' };
    if (letter === 'C') return { bg: '#81CBF2', text: '#20556B', letter: 'C' };
    if (letter === 'D') return { bg: '#F5A733', text: '#FFFFFF', letter: 'D' };
    if (letter === 'E') return { bg: '#E95053', text: '#FFFFFF', letter: 'E' };
    return { bg: '#6B7280', text: '#FFFFFF', letter };
  }
  
  return { bg: '#6B7280', text: '#FFFFFF', letter: '?' };
};

export default function TeamDashboard() {
  const [data, setData] = useState<TeamDashboardData | null>(null);
  const [initialLoading, setInitialLoading] = useState(true); // Only for first load
  const [dataLoading, setDataLoading] = useState(false); // For filter changes
  const [error, setError] = useState<string | null>(null);
  const [expandedClusters, setExpandedClusters] = useState<Set<string>>(new Set()); // Start with all clusters collapsed
  const [expandedPlatforms, setExpandedPlatforms] = useState<Set<string>>(new Set()); // Track expanded platforms
  // Status filter: excludedStatuses contains statuses that are NOT shown
  const [excludedStatuses, setExcludedStatuses] = useState<ApplicationStatus[]>(['Closed', 'Deprecated']); // Default: exclude Closed and Deprecated
  const [sortOption, setSortOption] = useState<SortOption>('fte-descending');
  const [statusDropdownOpen, setStatusDropdownOpen] = useState(false);
  const [governanceModels, setGovernanceModels] = useState<ReferenceValue[]>([]);
  const [hoveredGovModel, setHoveredGovModel] = useState<string | null>(null);

  // Fetch governance models on mount
  useEffect(() => {
    async function fetchGovernanceModels() {
      try {
        const refData = await getReferenceData();
        setGovernanceModels(refData.governanceModels);
      } catch (err) {
        console.error('Failed to fetch governance models:', err);
      }
    }
    fetchGovernanceModels();
  }, []);

  useEffect(() => {
    async function fetchData() {
      try {
        // Only show full page loading on initial load
        const isInitialLoad = data === null;
        if (isInitialLoad) {
          setInitialLoading(true);
        } else {
          setDataLoading(true);
        }
        const dashboardData = await getTeamDashboardData(excludedStatuses);
        setData(dashboardData);
        // Keep clusters collapsed by default (expandedClusters remains empty)
      } catch (err) {
        setError(err instanceof Error ? err.message : 'Failed to load team dashboard');
      } finally {
        setInitialLoading(false);
        setDataLoading(false);
      }
    }
    fetchData();
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [excludedStatuses]);

  // Close status dropdown when pressing Escape
  useEffect(() => {
    const handleEscape = (event: KeyboardEvent) => {
      if (event.key === 'Escape' && statusDropdownOpen) {
        setStatusDropdownOpen(false);
      }
    };

    if (statusDropdownOpen) {
      document.addEventListener('keydown', handleEscape);
    }

    return () => {
      document.removeEventListener('keydown', handleEscape);
    };
  }, [statusDropdownOpen]);

  const toggleCluster = (clusterId: string, event?: React.MouseEvent) => {
    // Prevent scroll jump by storing and restoring scroll position
    const scrollY = window.scrollY;
    
    setExpandedClusters(prev => {
      const newSet = new Set(prev);
      if (newSet.has(clusterId)) {
        newSet.delete(clusterId);
      } else {
        newSet.add(clusterId);
      }
      return newSet;
    });
    
    // Use requestAnimationFrame to restore scroll position after state update
    requestAnimationFrame(() => {
      window.scrollTo(0, scrollY);
    });
  };

  const togglePlatform = (platformId: string, e?: React.MouseEvent) => {
    if (e) {
      e.preventDefault();
      e.stopPropagation();
    }
    setExpandedPlatforms(prev => {
      const newSet = new Set(prev);
      if (newSet.has(platformId)) {
        newSet.delete(platformId);
      } else {
        newSet.add(platformId);
      }
      return newSet;
    });
  };

  const toggleStatus = (status: ApplicationStatus) => {
    setExcludedStatuses(prev => {
      if (prev.includes(status)) {
        // Remove from excluded (show it)
        return prev.filter(s => s !== status);
      } else {
        // Add to excluded (hide it)
        return [...prev, status];
      }
    });
  };

  // Only show full page loading on initial load
  if (initialLoading) {
    return (
      <div className="flex items-center justify-center h-64">
        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-blue-600" />
      </div>
    );
  }

  const hasNoApplications = data ? (
    data.clusters.length === 0 && 
    data.unassigned.applications.length === 0 && 
    data.unassigned.platforms.length === 0
  ) : true;

  const ClusterBlock = ({ clusterData, isUnassigned = false }: { clusterData: TeamDashboardCluster; isUnassigned?: boolean }) => {
    const clusterId = clusterData.cluster?.objectId || 'unassigned';
    const isExpanded = expandedClusters.has(clusterId);
    const clusterName = isUnassigned ? 'Nog niet toegekend' : (clusterData.cluster?.name || 'Onbekend');
    
    // Helper function to get effective FTE for an application
    const getEffectiveFTE = (app: { overrideFTE?: number | null; requiredEffortApplicationManagement?: number | null }) => 
      app.overrideFTE !== null && app.overrideFTE !== undefined ? app.overrideFTE : (app.requiredEffortApplicationManagement || 0);
    
    // Use pre-calculated min/max from backend (sum of all min/max FTE values)
    const minFTE = clusterData.minEffort ?? 0;
    const maxFTE = clusterData.maxEffort ?? 0;
    
    // Calculate application type distribution
    const byApplicationType: Record<string, number> = {};
    clusterData.applications.forEach(app => {
      const appType = app.applicationType?.name || 'Niet ingesteld';
      byApplicationType[appType] = (byApplicationType[appType] || 0) + 1;
    });
    clusterData.platforms.forEach(platformWithWorkloads => {
      const platformType = platformWithWorkloads.platform.applicationType?.name || 'Niet ingesteld';
      byApplicationType[platformType] = (byApplicationType[platformType] || 0) + 1;
      platformWithWorkloads.workloads.forEach(workload => {
        const workloadType = workload.applicationType?.name || 'Niet ingesteld';
        byApplicationType[workloadType] = (byApplicationType[workloadType] || 0) + 1;
      });
    });
    
    // Sort applications based on selected sort option
    const sortedApplications = [...clusterData.applications].sort((a, b) => {
      if (sortOption === 'alphabetical') {
        return a.name.localeCompare(b.name, 'nl', { sensitivity: 'base' });
      } else {
        // Sort by FTE descending (use override if present, otherwise calculated)
        const aFTE = getEffectiveFTE(a);
        const bFTE = getEffectiveFTE(b);
        return bFTE - aFTE;
      }
    });
    
    // Sort platforms based on selected sort option
    const sortedPlatforms = [...clusterData.platforms].sort((a, b) => {
      if (sortOption === 'alphabetical') {
        return a.platform.name.localeCompare(b.platform.name, 'nl', { sensitivity: 'base' });
      } else {
        // Sort by total FTE descending
        return b.totalEffort - a.totalEffort;
      }
    });

    return (
      <div className="bg-gray-50 rounded-lg shadow-sm border border-gray-200 mb-4" style={{ overflow: 'visible' }}>
        <button
          onClick={() => toggleCluster(clusterId)}
          className="w-full px-6 py-4 hover:bg-gray-50 transition-colors text-left"
          style={{ overflow: 'visible' }}
        >
          {/* First row: Cluster name and expand icon */}
          <div className="flex items-center space-x-4">
            <div className="flex-shrink-0">
              {isExpanded ? (
                <svg className="w-5 h-5 text-gray-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
                </svg>
              ) : (
                <svg className="w-5 h-5 text-gray-500" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
                </svg>
              )}
            </div>
            <h3 className="text-lg font-semibold text-gray-900 flex-1">{clusterName}</h3>
          </div>
          
          {/* Second row: KPIs - all horizontally aligned */}
          <div className="mt-3 ml-9 flex flex-wrap items-stretch gap-4">
            {/* FTE: Total and Min-Max range - most important KPI first - with highlight */}
            <div className="bg-gradient-to-br from-emerald-50 to-teal-50 border border-emerald-200 rounded-xl px-4 py-3 shadow-sm flex flex-col justify-center w-[180px] flex-shrink-0">
              <div className="text-xs text-emerald-700 font-semibold flex items-center gap-1.5">
                <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M17 20h5v-2a3 3 0 00-5.356-1.857M17 20H7m10 0v-2c0-.656-.126-1.283-.356-1.857M7 20H2v-2a3 3 0 015.356-1.857M7 20v-2c0-.656.126-1.283.356-1.857m0 0a5.002 5.002 0 019.288 0M15 7a3 3 0 11-6 0 3 3 0 016 0zm6 3a2 2 0 11-4 0 2 2 0 014 0zM7 10a2 2 0 11-4 0 2 2 0 014 0z" />
                </svg>
                FTE Totaal
              </div>
              <div className="text-3xl font-bold text-emerald-800">{clusterData.totalEffort.toFixed(2)}</div>
              <div className="text-[10px] text-emerald-600 font-medium mt-1">
                Bandbreedte:
              </div>
              <div className="text-xs text-emerald-600 font-medium">
                {minFTE.toFixed(2)} - {maxFTE.toFixed(2)} FTE
              </div>
            </div>
            
            {/* Applicatie count with type distribution */}
            <div className="flex flex-col justify-center">
              <div className="text-xs text-gray-500 font-semibold flex items-center gap-1.5">
                <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 11H5m14 0a2 2 0 012 2v6a2 2 0 01-2 2H5a2 2 0 01-2-2v-6a2 2 0 012-2m14 0V9a2 2 0 00-2-2M5 11V9a2 2 0 012-2m0 0V5a2 2 0 012-2h6a2 2 0 012 2v2M7 7h10" />
                </svg>
                Applicaties
              </div>
              <div className="text-2xl font-bold text-gray-900">{clusterData.applicationCount}</div>
              {Object.keys(byApplicationType).length > 0 && (
                <div className="text-xs text-gray-500 mt-1 grid grid-cols-2 gap-x-4 gap-y-0.5">
                  {Object.entries(byApplicationType)
                    .sort((a, b) => {
                      // Sort "Niet ingesteld" to the end
                      if (a[0] === 'Niet ingesteld') return 1;
                      if (b[0] === 'Niet ingesteld') return -1;
                      return a[0].localeCompare(b[0], 'nl', { sensitivity: 'base' });
                    })
                    .map(([type, count]) => {
                      // Color coding for application types
                      const typeColors: Record<string, string> = {
                        'Applicatie': 'bg-blue-400',
                        'Platform': 'bg-purple-400',
                        'Workload': 'bg-orange-400',
                        'Connected Device': 'bg-cyan-400',
                        'Niet ingesteld': 'bg-gray-300',
                      };
                      const dotColor = typeColors[type] || 'bg-gray-400';
                      
                      return (
                        <div key={type} className="flex items-center gap-1.5">
                          <span className={`w-2 h-2 rounded-full ${dotColor} flex-shrink-0`}></span>
                          <span className="truncate">{type}: <span className="font-medium text-gray-700">{count}</span></span>
                        </div>
                      );
                    })}
                </div>
              )}
            </div>
            
            {/* Governance Model Distribution - right aligned */}
            <div className="flex-1 flex flex-col justify-center" style={{ position: 'relative', zIndex: 10, overflow: 'visible' }}>
              <div className="text-xs font-semibold text-gray-500 text-right mb-1.5 flex items-center justify-end gap-1">
                Verdeling per regiemodel
                <span className="text-gray-400 text-[10px]" title="Hover voor details">ⓘ</span>
              </div>
              <div className="flex flex-wrap gap-2 justify-end" style={{ overflow: 'visible' }}>
                {/* Show all governance models from Jira Assets + "Niet ingesteld" */}
                {(() => {
                  // Get all governance models, sort alphabetically, add "Niet ingesteld" at the end
                  const allModels = [
                    ...governanceModels
                      .map(g => g.name)
                      .sort((a, b) => a.localeCompare(b, 'nl', { sensitivity: 'base' })),
                    'Niet ingesteld'
                  ];
                  
                  // Color schemes based on the model name/key
                  const getColorScheme = (name: string): { bg: string; text: string } => {
                    if (name.includes('Regiemodel A')) return { bg: '#20556B', text: '#FFFFFF' };
                    if (name.includes('Regiemodel B+') || name.includes('B+')) return { bg: '#286B86', text: '#FFFFFF' };
                    if (name.includes('Regiemodel B')) return { bg: '#286B86', text: '#FFFFFF' };
                    if (name.includes('Regiemodel C')) return { bg: '#81CBF2', text: '#20556B' };
                    if (name.includes('Regiemodel D')) return { bg: '#F5A733', text: '#FFFFFF' };
                    if (name.includes('Regiemodel E')) return { bg: '#E95053', text: '#FFFFFF' };
                    if (name === 'Niet ingesteld') return { bg: '#E5E7EB', text: '#9CA3AF' };
                    return { bg: '#6B7280', text: '#FFFFFF' }; // Default gray
                  };
                  
                  // Get short label from model name
                  const getShortLabel = (name: string): string => {
                    if (name === 'Niet ingesteld') return '?';
                    // Extract letter(s) after "Regiemodel " or use first char
                    const match = name.match(/Regiemodel\s+(.+)/i);
                    return match ? match[1] : name.charAt(0);
                  };
                  
                  return allModels;
                })()
                  .map((govModel) => {
                    const count = clusterData.byGovernanceModel[govModel] || 0;
                    const colors = (() => {
                      if (govModel.includes('Regiemodel A')) return { bg: '#20556B', text: '#FFFFFF' };
                      if (govModel.includes('Regiemodel B+') || govModel.includes('B+')) return { bg: '#286B86', text: '#FFFFFF' };
                      if (govModel.includes('Regiemodel B')) return { bg: '#286B86', text: '#FFFFFF' };
                      if (govModel.includes('Regiemodel C')) return { bg: '#81CBF2', text: '#20556B' };
                      if (govModel.includes('Regiemodel D')) return { bg: '#F5A733', text: '#FFFFFF' };
                      if (govModel.includes('Regiemodel E')) return { bg: '#E95053', text: '#FFFFFF' };
                      if (govModel === 'Niet ingesteld') return { bg: '#E5E7EB', text: '#9CA3AF' };
                      return { bg: '#6B7280', text: '#FFFFFF' }; // Default gray
                    })();
                    // Short label: extract letter(s) after "Regiemodel " or use "?"
                    const shortLabel = govModel === 'Niet ingesteld' 
                      ? '?' 
                      : (govModel.match(/Regiemodel\s+(.+)/i)?.[1] || govModel.charAt(0));
                    // Find governance model details from fetched data
                    const govModelData = governanceModels.find(g => g.name === govModel);
                    const hoverKey = `${clusterId}-${govModel}`;
                    const isHovered = hoveredGovModel === hoverKey;
                    
                    return (
                      <div 
                        key={govModel} 
                        className={`rounded-xl py-2 shadow-sm hover:shadow-lg transition-all duration-200 w-[48px] text-center cursor-pointer ${count === 0 ? 'opacity-50 hover:opacity-70' : ''}`}
                        style={{ 
                          backgroundColor: colors.bg, 
                          color: colors.text,
                          position: isHovered ? 'relative' : 'static',
                          zIndex: isHovered ? 9999 : 'auto'
                        }}
                        onMouseEnter={() => setHoveredGovModel(hoverKey)}
                        onMouseLeave={() => setHoveredGovModel(null)}
                        onClick={(e) => e.stopPropagation()}
                      >
                        <div className="text-[10px] font-bold uppercase tracking-wider" style={{ opacity: 0.9 }}>
                          {shortLabel}
                        </div>
                        <div className="text-xl font-bold leading-tight">
                          {count}
                        </div>
                        
                        {/* Hover popup */}
                        {isHovered && govModel !== 'Niet ingesteld' && (
                          <div 
                            className="absolute right-0 top-full mt-3 w-80 rounded-xl shadow-2xl border border-gray-200 p-4 text-left"
                            style={{ 
                              pointerEvents: 'auto',
                              zIndex: 99999,
                              backgroundColor: '#ffffff',
                              opacity: 1
                            }}
                            onClick={(e) => e.stopPropagation()}
                          >
                            {/* Arrow pointer */}
                            <div 
                              className="absolute -top-2 right-5 w-0 h-0 border-l-8 border-r-8 border-b-8 border-transparent"
                              style={{ borderBottomColor: '#ffffff', filter: 'drop-shadow(0 -1px 1px rgba(0,0,0,0.1))' }} 
                            />
                            
                            {/* Header: Summary (Description) */}
                            <div className="text-sm font-bold text-gray-900 mb-2">
                              {govModelData?.summary || govModel}
                              {govModelData?.description && (
                                <span className="font-normal text-gray-500"> ({govModelData.description})</span>
                              )}
                            </div>
                            
                            {/* Remarks */}
                            {govModelData?.remarks && (
                              <div className="text-xs text-gray-600 mb-3 whitespace-pre-wrap leading-relaxed">
                                {govModelData.remarks}
                              </div>
                            )}
                            
                            {/* Application section */}
                            {govModelData?.application && (
                              <div className="border-t border-gray-100 pt-3 mt-3">
                                <div className="text-xs font-bold text-gray-700 mb-1.5 uppercase tracking-wide">
                                  Toepassing
                                </div>
                                <div className="text-xs text-gray-600 whitespace-pre-wrap leading-relaxed">
                                  {govModelData.application}
                                </div>
                              </div>
                            )}
                            
                            {/* Fallback message if no data */}
                            {!govModelData && (
                              <div className="text-xs text-gray-400 italic">
                                Geen aanvullende informatie beschikbaar
                              </div>
                            )}
                          </div>
                        )}
                      </div>
                    );
                  })}
              </div>
            </div>
          </div>
        </button>

        {isExpanded && (
          <div className="border-t border-gray-200 px-6 py-4">
            {clusterData.applications.length === 0 && clusterData.platforms.length === 0 ? (
              <p className="text-sm text-gray-500">Geen applicaties in dit cluster</p>
            ) : (
              <div className="space-y-3">
                {/* Platforms with Workloads - shown first */}
                {sortedPlatforms.map((platformWithWorkloads) => {
                  const platformId = platformWithWorkloads.platform.id;
                  const isPlatformExpanded = expandedPlatforms.has(platformId);
                  const hasWorkloads = platformWithWorkloads.workloads.length > 0;
                  const platformGovStyle = getGovernanceModelStyle(platformWithWorkloads.platform.governanceModel?.name);
                  const platform = platformWithWorkloads.platform;
                  const platformMinFTE = platform.overrideFTE !== null && platform.overrideFTE !== undefined
                    ? platform.overrideFTE
                    : (platform.minFTE ?? platform.requiredEffortApplicationManagement ?? 0);
                  const platformMaxFTE = platform.overrideFTE !== null && platform.overrideFTE !== undefined
                    ? platform.overrideFTE
                    : (platform.maxFTE ?? platform.requiredEffortApplicationManagement ?? 0);
                  // Calculate total min/max including workloads
                  const totalMinFTE = platformMinFTE + platformWithWorkloads.workloads.reduce((sum, w) => {
                    return sum + (w.overrideFTE ?? w.minFTE ?? w.requiredEffortApplicationManagement ?? 0);
                  }, 0);
                  const totalMaxFTE = platformMaxFTE + platformWithWorkloads.workloads.reduce((sum, w) => {
                    return sum + (w.overrideFTE ?? w.maxFTE ?? w.requiredEffortApplicationManagement ?? 0);
                  }, 0);
                  
                  return (
                    <div key={platformId} className="border border-blue-200 rounded-lg bg-blue-50 overflow-hidden flex">
                      {/* Governance Model indicator */}
                      <div 
                        className="w-10 flex-shrink-0 flex items-center justify-center font-bold text-sm"
                        style={{ backgroundColor: platformGovStyle.bg, color: platformGovStyle.text }}
                        title={platform.governanceModel?.name || 'Niet ingesteld'}
                      >
                        {platformGovStyle.letter}
                      </div>
                      
                      <div className="flex-1">
                        {/* Platform header */}
                        <div className="flex items-center">
                          {hasWorkloads && (
                            <button
                              onClick={(e) => togglePlatform(platformId, e)}
                              className="p-2 hover:bg-blue-100 transition-colors flex-shrink-0"
                              title={isPlatformExpanded ? 'Inklappen' : 'Uitklappen'}
                            >
                              <svg
                                className={`w-5 h-5 text-blue-700 transition-transform ${isPlatformExpanded ? 'transform rotate-90' : ''}`}
                                fill="none"
                                stroke="currentColor"
                                viewBox="0 0 24 24"
                              >
                                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
                              </svg>
                            </button>
                          )}
                          <Link
                            to={`/applications/${platformId}`}
                            target="_blank"
                            rel="noopener noreferrer"
                            className={`flex-1 p-3 hover:bg-blue-100 transition-colors ${!hasWorkloads ? 'rounded-r-lg' : ''}`}
                          >
                            <div className="flex items-center justify-between">
                              <div className="flex-1">
                                <div className="flex items-center space-x-2 flex-wrap gap-y-1">
                                  <div className="font-medium text-gray-900">{platformWithWorkloads.platform.name}</div>
                                  <span className="text-xs font-semibold text-blue-700 bg-blue-200 px-2 py-0.5 rounded">
                                    Platform
                                  </span>
                                  {platform.applicationManagementHosting?.name && (
                                    <span className="text-xs px-2 py-0.5 bg-blue-100 text-blue-700 rounded-full">
                                      {platform.applicationManagementHosting.name}
                                    </span>
                                  )}
                                </div>
                                <div className="text-sm text-gray-500">{platformWithWorkloads.platform.key}</div>
                              </div>
                              <div className="text-right">
                                {(() => {
                                  const platformHasOverride = platform.overrideFTE !== null && platform.overrideFTE !== undefined;
                                  const platformCalculated = platform.requiredEffortApplicationManagement || 0;
                                  const workloadsCalculated = platformWithWorkloads.workloads.reduce((sum, w) => 
                                    sum + (w.requiredEffortApplicationManagement || 0), 0
                                  );
                                  const totalCalculated = platformCalculated + workloadsCalculated;
                                  const hasAnyOverride = platformHasOverride || platformWithWorkloads.workloads.some(w => 
                                    w.overrideFTE !== null && w.overrideFTE !== undefined
                                  );
                                  
                                  return (
                                    <>
                                      <div className="text-sm font-medium text-gray-900">
                                        {platformWithWorkloads.totalEffort.toFixed(2)} FTE
                                      </div>
                                      <div className="text-xs text-gray-400">
                                        {totalMinFTE.toFixed(2)} - {totalMaxFTE.toFixed(2)}
                                      </div>
                                      {hasAnyOverride && (
                                        <div className="text-xs text-gray-400 mt-1">
                                          (berekend: {totalCalculated.toFixed(2)})
                                        </div>
                                      )}
                                      <div className="text-xs text-gray-500 mt-1">
                                      Platform: {platformWithWorkloads.platformEffort.toFixed(2)} FTE
                                      {platformHasOverride && platformCalculated !== null && (
                                        <span className="text-gray-400"> (berekend: {platformCalculated.toFixed(2)})</span>
                                      )}
                                      {hasWorkloads && (
                                        <> + Workloads: {platformWithWorkloads.workloadsEffort.toFixed(2)} FTE</>
                                      )}
                                    </div>
                                  </>
                                );
                              })()}
                            </div>
                          </div>
                        </Link>
                        </div>
                        
                        {/* Workloads list */}
                        {hasWorkloads && isPlatformExpanded && (
                          <div className="border-t border-blue-200 bg-white rounded-br-lg">
                            <div className="px-3 py-2 bg-blue-100 border-b border-blue-200">
                              <div className="text-xs font-medium text-blue-700">
                                Workloads ({platformWithWorkloads.workloads.length})
                              </div>
                            </div>
                            <div className="divide-y divide-gray-200">
                              {[...platformWithWorkloads.workloads]
                                .sort((a, b) => {
                                  if (sortOption === 'alphabetical') {
                                    return a.name.localeCompare(b.name, 'nl', { sensitivity: 'base' });
                                  } else {
                                    // Sort by FTE descending (use override if present, otherwise calculated)
                                    const wlEffectiveFTE = (wl: typeof a) => wl.overrideFTE !== null && wl.overrideFTE !== undefined ? wl.overrideFTE : (wl.requiredEffortApplicationManagement || 0);
                                    const aFTE = wlEffectiveFTE(a);
                                    const bFTE = wlEffectiveFTE(b);
                                    return bFTE - aFTE;
                                  }
                                })
                                .map((workload) => {
                                  const workloadGovStyle = getGovernanceModelStyle(workload.governanceModel?.name);
                                  const workloadType = workload.applicationType?.name || 'Workload';
                                  const workloadHosting = workload.applicationManagementHosting?.name;
                                  const workloadEffectiveFTE = workload.overrideFTE !== null && workload.overrideFTE !== undefined 
                                    ? workload.overrideFTE 
                                    : workload.requiredEffortApplicationManagement;
                                  const workloadMinFTE = workload.overrideFTE ?? workload.minFTE ?? workload.requiredEffortApplicationManagement ?? 0;
                                  const workloadMaxFTE = workload.overrideFTE ?? workload.maxFTE ?? workload.requiredEffortApplicationManagement ?? 0;
                                  
                                  return (
                                    <div key={workload.id} className="flex items-stretch">
                                      {/* Governance Model indicator for workload */}
                                      <div 
                                        className="w-8 flex-shrink-0 flex items-center justify-center font-bold text-xs"
                                        style={{ backgroundColor: workloadGovStyle.bg, color: workloadGovStyle.text, opacity: 0.7 }}
                                        title={workload.governanceModel?.name || 'Niet ingesteld'}
                                      >
                                        {workloadGovStyle.letter}
                                      </div>
                                      <Link
                                        to={`/applications/${workload.id}`}
                                        target="_blank"
                                        rel="noopener noreferrer"
                                        className="flex-1 px-4 py-2 hover:bg-gray-50 transition-colors"
                                      >
                                        <div className="flex items-center justify-between">
                                          <div className="flex-1">
                                            <div className="flex items-center gap-2 flex-wrap">
                                              <span className="text-sm font-medium text-gray-700">{workload.name}</span>
                                              <span className="text-[10px] px-1.5 py-0.5 bg-gray-100 text-gray-500 rounded">
                                                {workloadType}
                                              </span>
                                              {workloadHosting && (
                                                <span className="text-[10px] px-1.5 py-0.5 bg-blue-50 text-blue-600 rounded">
                                                  {workloadHosting}
                                                </span>
                                              )}
                                            </div>
                                            <div className="text-xs text-gray-500">{workload.key}</div>
                                          </div>
                                          <div className="text-right">
                                            {workloadEffectiveFTE !== null && workloadEffectiveFTE !== undefined ? (
                                              <div>
                                                <div className="text-xs font-medium text-gray-600">
                                                  {workloadEffectiveFTE.toFixed(2)} FTE
                                                </div>
                                                <div className="text-[10px] text-gray-400">
                                                  {workloadMinFTE.toFixed(2)} - {workloadMaxFTE.toFixed(2)}
                                                </div>
                                              </div>
                                            ) : (
                                              <div className="text-xs text-gray-400">Niet berekend</div>
                                            )}
                                          </div>
                                        </div>
                                      </Link>
                                    </div>
                                  );
                                })}
                            </div>
                          </div>
                        )}
                      </div>
                    </div>
                  );
                })}
                
                {/* Regular applications - shown after platforms */}
                {sortedApplications.map((app) => {
                  const govStyle = getGovernanceModelStyle(app.governanceModel?.name);
                  const appType = app.applicationType?.name || 'Niet ingesteld';
                  const appHosting = app.applicationManagementHosting?.name;
                  const effectiveFTE = app.overrideFTE !== null && app.overrideFTE !== undefined 
                    ? app.overrideFTE 
                    : app.requiredEffortApplicationManagement;
                  const appMinFTE = app.overrideFTE !== null && app.overrideFTE !== undefined
                    ? app.overrideFTE
                    : (app.minFTE ?? app.requiredEffortApplicationManagement ?? 0);
                  const appMaxFTE = app.overrideFTE !== null && app.overrideFTE !== undefined
                    ? app.overrideFTE
                    : (app.maxFTE ?? app.requiredEffortApplicationManagement ?? 0);
                  
                  return (
                    <Link
                      key={app.id}
                      to={`/applications/${app.id}`}
                      target="_blank"
                      rel="noopener noreferrer"
                      className="flex items-stretch bg-gray-50 rounded-lg hover:bg-gray-100 transition-colors overflow-hidden"
                    >
                      {/* Governance Model indicator */}
                      <div 
                        className="w-10 flex-shrink-0 flex items-center justify-center font-bold text-sm"
                        style={{ backgroundColor: govStyle.bg, color: govStyle.text }}
                        title={app.governanceModel?.name || 'Niet ingesteld'}
                      >
                        {govStyle.letter}
                      </div>
                      
                      <div className="flex-1 p-3 flex items-center justify-between">
                        <div className="flex-1">
                          <div className="flex items-center gap-2 flex-wrap">
                            <span className="font-medium text-gray-900">{app.name}</span>
                            <span className="text-xs px-2 py-0.5 bg-gray-200 text-gray-600 rounded-full">
                              {appType}
                            </span>
                            {appHosting && (
                              <span className="text-xs px-2 py-0.5 bg-blue-100 text-blue-700 rounded-full">
                                {appHosting}
                              </span>
                            )}
                          </div>
                          <div className="text-sm text-gray-500">{app.key}</div>
                        </div>
                        <div className="text-right">
                          {effectiveFTE !== null && effectiveFTE !== undefined ? (
                            <div>
                              <div className="text-sm font-medium text-gray-900">
                                {effectiveFTE.toFixed(2)} FTE
                              </div>
                              <div className="text-xs text-gray-400">
                                {appMinFTE.toFixed(2)} - {appMaxFTE.toFixed(2)}
                              </div>
                            </div>
                          ) : (
                            <div className="text-sm text-gray-400">Niet berekend</div>
                          )}
                        </div>
                      </div>
                    </Link>
                  );
                })}
              </div>
            )}
          </div>
        )}
      </div>
    );
  };

  return (
    <div>
      <div className="mb-6">
        <h1 className="text-2xl font-bold text-gray-900">Team-indeling</h1>
        <p className="mt-1 text-sm text-gray-500">
          Overzicht van applicaties gegroepeerd per Application Cluster
        </p>
      </div>

      {/* Compact Filter Bar */}
      <div className="mb-6 bg-gray-50 rounded-lg shadow-sm border border-gray-200 p-3">
        <div className="flex flex-wrap items-center gap-3">
          {/* Sort Option */}
          <div className="flex items-center gap-2">
            <label className="text-xs font-medium text-gray-600 whitespace-nowrap">
              Sorteer:
            </label>
            <select
              value={sortOption}
              onChange={(e) => setSortOption(e.target.value as SortOption)}
              className="px-2.5 py-1.5 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:ring-blue-500 focus:border-blue-500 text-sm bg-white min-w-[140px]"
            >
              <option value="alphabetical">Alfabetisch</option>
              <option value="fte-descending">FTE (aflopend)</option>
            </select>
          </div>

          {/* Status Filter Dropdown */}
          <div className="flex items-center gap-2 relative">
            <label className="text-xs font-medium text-gray-600 whitespace-nowrap">
              Status:
            </label>
            <div className="relative">
              <button
                type="button"
                onClick={() => setStatusDropdownOpen(!statusDropdownOpen)}
                className="px-2.5 py-1.5 border border-gray-300 rounded-md shadow-sm focus:outline-none focus:ring-1 focus:ring-blue-500 focus:border-blue-500 text-sm bg-white min-w-[180px] text-left flex items-center justify-between gap-2 hover:bg-gray-50"
              >
                <span className="text-gray-700">
                  {excludedStatuses.length === 0
                    ? 'Alle statussen'
                    : excludedStatuses.length === 1
                    ? `${ALL_STATUSES.length - 1} van ${ALL_STATUSES.length}`
                    : `${ALL_STATUSES.length - excludedStatuses.length} van ${ALL_STATUSES.length}`}
                </span>
                <svg
                  className={`w-4 h-4 text-gray-400 transition-transform ${statusDropdownOpen ? 'rotate-180' : ''}`}
                  fill="none"
                  stroke="currentColor"
                  viewBox="0 0 24 24"
                >
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
                </svg>
              </button>

              {statusDropdownOpen && (
                <>
                  <div
                    className="fixed inset-0 z-10"
                    onClick={() => setStatusDropdownOpen(false)}
                  />
                  <div className="absolute z-20 mt-1 w-64 bg-white border border-gray-300 rounded-md shadow-lg max-h-80 overflow-auto">
                    <div className="p-2 border-b border-gray-200 flex items-center justify-between">
                      <span className="text-xs font-semibold text-gray-700">Selecteer statussen</span>
                      <button
                        onClick={(e) => {
                          e.stopPropagation();
                          setExcludedStatuses(['Closed', 'Deprecated']);
                          setStatusDropdownOpen(false);
                        }}
                        className="text-xs text-blue-600 hover:text-blue-700 font-medium"
                      >
                        Reset
                      </button>
                    </div>
                    <div className="p-2 space-y-1">
                      {ALL_STATUSES.map((status) => {
                        const isExcluded = excludedStatuses.includes(status);
                        return (
                          <label
                            key={status}
                            onClick={(e) => e.stopPropagation()}
                            className="flex items-center space-x-2 cursor-pointer p-2 rounded hover:bg-gray-50"
                          >
                            <input
                              type="checkbox"
                              checked={!isExcluded}
                              onChange={() => toggleStatus(status)}
                              className="rounded border-gray-300 text-blue-600 focus:ring-blue-500"
                            />
                            <span className="text-sm text-gray-700">{status}</span>
                          </label>
                        );
                      })}
                    </div>
                    <div className="p-2 border-t border-gray-200 bg-gray-50">
                      <p className="text-xs text-gray-500">
                        Uitgevinkte statussen worden verborgen
                      </p>
                    </div>
                  </div>
                </>
              )}
            </div>
          </div>
        </div>
      </div>

      {/* Error message */}
      {error && (
        <div className="mb-6 bg-red-50 border border-red-200 rounded-lg p-4 text-red-700">
          {error}
        </div>
      )}

      {/* Loading indicator for data updates */}
      {dataLoading && (
        <div className="mb-6 flex items-center justify-center py-4">
          <div className="flex items-center gap-2 text-sm text-gray-600">
            <div className="animate-spin rounded-full h-4 w-4 border-b-2 border-blue-600" />
            <span>Resultaten bijwerken...</span>
          </div>
        </div>
      )}

      {/* Clusters */}
      {!dataLoading && data && data.clusters.length > 0 && (
        <div className="mb-8">
          {data.clusters.map((clusterData) => (
            <ClusterBlock key={clusterData.cluster?.objectId || 'unknown'} clusterData={clusterData} />
          ))}
        </div>
      )}

      {/* Unassigned applications */}
      {!dataLoading && data && (data.unassigned.applications.length > 0 || data.unassigned.platforms.length > 0) && (
        <div className="bg-yellow-50 border border-yellow-200 rounded-lg">
          <ClusterBlock
            isUnassigned={true}
            clusterData={{
              cluster: null,
              applications: data.unassigned.applications,
              platforms: data.unassigned.platforms,
              totalEffort: data.unassigned.totalEffort,
              applicationCount: data.unassigned.applicationCount,
              byGovernanceModel: data.unassigned.byGovernanceModel,
            }}
          />
          <div className="px-6 pb-4">
            <p className="text-sm text-yellow-700">
              Deze applicaties zijn nog niet toegekend aan een cluster.
            </p>
          </div>
        </div>
      )}

      {!dataLoading && data && hasNoApplications && (
        <div className="bg-gray-50 border border-gray-200 rounded-lg p-8 text-center">
          <p className="text-gray-500">Geen applicaties gevonden</p>
        </div>
      )}
    </div>
  );
}