import React, { useState, useEffect } from 'react';
import './ChargingHub.css';

// Mock data for demonstration purposes
const mockChargingPorts = [
  { id: 1, number: 1, status: 'available', type: 'DC Fast', power: '250kW', lastUsed: null },
  { id: 2, number: 2, status: 'charging', type: 'DC Fast', power: '250kW', vehicle: 'Tesla Model 3', startTime: '14:30', endTime: '15:15', progress: 68 },
  { id: 3, number: 3, status: 'reserved', type: 'DC Fast', power: '250kW', reservedFor: '17:00', duration: '45 min' },
  { id: 4, number: 4, status: 'maintenance', type: 'DC Fast', power: '250kW', maintenanceNote: 'Scheduled maintenance', estimatedCompletion: '18:00' },
  { id: 5, number: 5, status: 'available', type: 'DC Fast', power: '250kW', lastUsed: '13:45' },
  { id: 6, number: 6, status: 'charging', type: 'DC Fast', power: '250kW', vehicle: 'Tesla Model Y', startTime: '15:10', endTime: '15:55', progress: 42 },
  { id: 7, number: 7, status: 'available', type: 'DC Fast', power: '250kW', lastUsed: '12:30' },
  { id: 8, number: 8, status: 'charging', type: 'DC Fast', power: '250kW', vehicle: 'GMC Hummer EV', startTime: '15:25', endTime: '16:10', progress: 25 },
];

const mockEnergyData = {
  currentDemand: 625,
  peakDemand: 1200,
  solarGeneration: 85,
  batteryStorage: 72,
  gridConsumption: 540,
  dailyUsage: [
    { hour: '00:00', demand: 120 },
    { hour: '01:00', demand: 90 },
    { hour: '02:00', demand: 75 },
    { hour: '03:00', demand: 60 },
    { hour: '04:00', demand: 45 },
    { hour: '05:00', demand: 60 },
    { hour: '06:00', demand: 150 },
    { hour: '07:00', demand: 300 },
    { hour: '08:00', demand: 450 },
    { hour: '09:00', demand: 600 },
    { hour: '10:00', demand: 750 },
    { hour: '11:00', demand: 900 },
    { hour: '12:00', demand: 1050 },
    { hour: '13:00', demand: 1150 },
    { hour: '14:00', demand: 1200 },
    { hour: '15:00', demand: 1100 },
    { hour: '16:00', demand: 950 },
    { hour: '17:00', demand: 800 },
    { hour: '18:00', demand: 700 },
    { hour: '19:00', demand: 600 },
    { hour: '20:00', demand: 500 },
    { hour: '21:00', demand: 400 },
    { hour: '22:00', demand: 300 },
    { hour: '23:00', demand: 200 },
  ],
};

const mockVisitors = {
  current: 24,
  capacity: 50,
  averageDuration: 38,
  peakHours: '12:00 - 14:00',
  amenityUsage: {
    lounge: 65,
    cafe: 48,
    retail: 32,
    workspace: 25,
  },
};

const mockReservations = [
  { id: 101, name: 'John Smith', vehicle: 'Tesla Model 3', time: '17:00', duration: '45 min', port: 3, status: 'confirmed' },
  { id: 102, name: 'Sarah Johnson', vehicle: 'Tesla Model Y', time: '17:30', duration: '30 min', port: 1, status: 'confirmed' },
  { id: 103, name: 'Michael Brown', vehicle: 'Ford F-150 Lightning', time: '18:15', duration: '60 min', port: 5, status: 'pending' },
  { id: 104, name: 'Emily Davis', vehicle: 'Rivian R1T', time: '19:00', duration: '45 min', port: 7, status: 'confirmed' },
];

function ChargingHub() {
  const [activeTab, setActiveTab] = useState('dashboard');
  const [loading, setLoading] = useState(true);
  const [currentTime, setCurrentTime] = useState('');
  const [hubStatus, setHubStatus] = useState({
    name: 'The Link - Downtown',
    location: 'Springfield, IL',
    status: 'operational',
    occupancy: '48%',
    availablePorts: 3,
    totalPorts: 8,
    energyEfficiency: '92%',
  });

  useEffect(() => {
    // Simulate loading
    const timer = setTimeout(() => {
      setLoading(false);
    }, 1500);
    
    // Update current time
    const updateTime = () => {
      const now = new Date();
      const hours = now.getHours().toString().padStart(2, '0');
      const minutes = now.getMinutes().toString().padStart(2, '0');
      setCurrentTime(`${hours}:${minutes}`);
    };
    
    updateTime();
    const timeInterval = setInterval(updateTime, 60000);
    
    return () => {
      clearTimeout(timer);
      clearInterval(timeInterval);
    };
  }, []);

  // Function to render status badge with appropriate color
  const renderStatusBadge = (status) => {
    let className = 'status-badge';
    
    switch(status) {
      case 'available':
        className += ' available';
        break;
      case 'charging':
        className += ' charging';
        break;
      case 'reserved':
        className += ' reserved';
        break;
      case 'maintenance':
        className += ' maintenance';
        break;
      default:
        break;
    }
    
    return <span className={className}>{status}</span>;
  };

  // Function to render progress bar for charging ports
  const renderProgressBar = (progress) => {
    return (
      <div className="progress-container">
        <div className="progress-bar" style={{ width: `${progress}%` }}>
          <div className="progress-glow"></div>
        </div>
        <span className="progress-text">{progress}%</span>
      </div>
    );
  };

  if (loading) {
    return (
      <div className="charging-hub loading">
        <div className="loading-logo">
          <img src="/images/the_link_logo.png" alt="The Link" />
          <div className="loading-pulse"></div>
        </div>
        <p>Initializing Hub Dashboard...</p>
      </div>
    );
  }

  return (
    <div className="charging-hub">
      <header className="hub-header">
        <div className="hub-title">
          <h1>THE LINK</h1>
          <span className="hub-subtitle">Charging Hub Dashboard</span>
        </div>
        <div className="hub-status">
          <div className="status-item">
            <span className="status-label">Hub Status:</span>
            <span className={`status-value ${hubStatus.status}`}>{hubStatus.status}</span>
          </div>
          <div className="status-item">
            <span className="status-label">Current Time:</span>
            <span className="status-value">{currentTime}</span>
          </div>
        </div>
        <div className="hub-actions">
          <button className="action-button">
            <span className="icon">⚙️</span>
            <span>Settings</span>
          </button>
          <button className="action-button">
            <span className="icon">🔔</span>
            <span>Alerts</span>
          </button>
          <div className="user-profile">
            <img src="/images/admin_avatar.png" alt="Admin" />
          </div>
        </div>
      </header>

      <div className="hub-navigation">
        <button 
          className={`nav-button ${activeTab === 'dashboard' ? 'active' : ''}`}
          onClick={() => setActiveTab('dashboard')}
        >
          Dashboard
        </button>
        <button 
          className={`nav-button ${activeTab === 'charging' ? 'active' : ''}`}
          onClick={() => setActiveTab('charging')}
        >
          Charging Ports
        </button>
        <button 
          className={`nav-button ${activeTab === 'energy' ? 'active' : ''}`}
          onClick={() => setActiveTab('energy')}
        >
          Energy Management
        </button>
        <button 
          className={`nav-button ${activeTab === 'visitors' ? 'active' : ''}`}
          onClick={() => setActiveTab('visitors')}
        >
          Visitor Analytics
        </button>
        <button 
          className={`nav-button ${activeTab === 'reservations' ? 'active' : ''}`}
          onClick={() => setActiveTab('reservations')}
        >
          Reservations
        </button>
      </div>

      <main className="hub-content">
        {activeTab === 'dashboard' && (
          <div className="dashboard-view">
            <div className="hub-overview">
              <div className="overview-card location">
                <h3>Hub Location</h3>
                <div className="location-details">
                  <div className="location-name">{hubStatus.name}</div>
                  <div className="location-address">{hubStatus.location}</div>
                </div>
                <div className="location-map">
                  <img src="/images/hub_location_map.png" alt="Hub Location" />
                </div>
              </div>
              
              <div className="overview-card occupancy">
                <h3>Current Occupancy</h3>
                <div className="occupancy-gauge">
                  <svg viewBox="0 0 120 120" className="gauge">
                    <circle cx="60" cy="60" r="50" className="gauge-background" />
                    <circle 
                      cx="60" 
                      cy="60" 
                      r="50" 
                      className="gauge-progress" 
                      style={{ 
                        strokeDasharray: `${parseInt(hubStatus.occupancy) * 3.14}px, 314px` 
                      }} 
                    />
                    <text x="60" y="65" textAnchor="middle" className="gauge-text">
                      {hubStatus.occupancy}
                    </text>
                  </svg>
                </div>
                <div className="occupancy-details">
                  <div className="detail-item">
                    <span className="detail-label">Available Ports:</span>
                    <span className="detail-value">{hubStatus.availablePorts}/{hubStatus.totalPorts}</span>
                  </div>
                </div>
              </div>
              
              <div className="overview-card energy">
                <h3>Energy Overview</h3>
                <div className="energy-metrics">
                  <div className="metric">
                    <div className="metric-value">{mockEnergyData.currentDemand} kW</div>
                    <div className="metric-label">Current Demand</div>
                  </div>
                  <div className="metric">
                    <div className="metric-value">{mockEnergyData.solarGeneration}%</div>
                    <div className="metric-label">Solar Generation</div>
                  </div>
                  <div className="metric">
                    <div className="metric-value">{mockEnergyData.batteryStorage}%</div>
                    <div className="metric-label">Battery Storage</div>
                  </div>
                </div>
                <div className="energy-chart">
                  <div className="chart-container">
                    {/* Simplified chart representation */}
                    <div className="chart-bars">
                      {mockEnergyData.dailyUsage.slice(-8).map((hour, index) => (
                        <div 
                          key={index} 
                          className="chart-bar" 
                          style={{ height: `${(hour.demand / mockEnergyData.peakDemand) * 100}%` }}
                        >
                          <div className="bar-glow"></div>
                        </div>
                      ))}
                    </div>
                  </div>
                </div>
              </div>
              
              <div className="overview-card visitors">
                <h3>Visitor Analytics</h3>
                <div className="visitor-count">
                  <div className="count-value">{mockVisitors.current}</div>
                  <div className="count-label">Current Visitors</div>
                </div>
                <div className="visitor-details">
                  <div className="detail-item">
                    <span className="detail-label">Capacity:</span>
                    <span className="detail-value">{mockVisitors.capacity}</span>
                  </div>
                  <div className="detail-item">
                    <span className="detail-label">Avg. Duration:</span>
                    <span className="detail-value">{mockVisitors.averageDuration} min</span>
                  </div>
                  <div className="detail-item">
                    <span className="detail-label">Peak Hours:</span>
                    <span className="detail-value">{mockVisitors.peakHours}</span>
                  </div>
                </div>
              </div>
            </div>
            
            <div className="quick-status">
              <h3>Charging Port Status</h3>
              <div className="port-status-grid">
                {mockChargingPorts.map(port => (
                  <div key={port.id} className={`port-status-card ${port.status}`}>
                    <div className="port-number">{port.number}</div>
                    <div className="port-status">{renderStatusBadge(port.status)}</div>
                    {port.status === 'charging' && (
                      <div className="port-progress">{renderProgressBar(port.progress)}</div>
                    )}
                  </div>
                ))}
              </div>
            </div>
            
            <div className="upcoming-reservations">
              <h3>Upcoming Reservations</h3>
              <div className="reservation-list">
                {mockReservations.map(reservation => (
                  <div key={reservation.id} className="reservation-card">
                    <div className="reservation-time">{reservation.time}</div>
                    <div className="reservation-details">
                      <div className="reservation-name">{reservation.name}</div>
                      <div className="reservation-vehicle">{reservation.vehicle}</div>
                    </div>
                    <div className="reservation-port">Port {reservation.port}</div>
                    <div className="reservation-duration">{reservation.duration}</div>
                    <div className={`reservation-status ${reservation.status}`}>
                      {reservation.status}
                    </div>
                  </div>
                ))}
              </div>
            </div>
          </div>
        )}

        {activeTab === 'charging' && (
          <div className="charging-view">
            <div className="section-header">
              <h2>Charging Port Management</h2>
              <div className="header-actions">
                <button className="action-button">
                  <span className="icon">+</span>
                  <span>Add Port</span>
                </button>
                <div className="filter-dropdown">
                  <select>
                    <option value="all">All Statuses</option>
                    <option value="available">Available</option>
                    <option value="charging">Charging</option>
                    <option value="reserved">Reserved</option>
                    <option value="maintenance">Maintenance</option>
                  </select>
                </div>
              </div>
            </div>
            
            <div className="charging-ports-grid">
              {mockChargingPorts.map(port => (
                <div key={port.id} className={`port-card ${port.status}`}>
                  <div className="port-header">
                    <div className="port-number">Port {port.number}</div>
                    <div className="port-status">{renderStatusBadge(port.status)}</div>
                  </div>
                  
                  <div className="port-details">
                    <div className="detail-item">
                      <span className="detail-label">Type:</span>
                      <span className="detail-value">{port.type}</span>
                    </div>
                    <div className="detail-item">
                      <span className="detail-label">Power:</span>
                      <span className="detail-value">{port.power}</span>
                    </div>
                    
                    {port.status === 'available' && (
                      <div className="detail-item">
                        <span className="detail-label">Last Used:</span>
                        <span className="detail-value">{port.lastUsed || 'N/A'}</span>
                      </div>
                    )}
                    
                    {port.status === 'charging' && (
                      <>
                        <div className="detail-item">
                          <span className="detail-label">Vehicle:</span>
                          <span className="detail-value">{port.vehicle}</span>
                        </div>
                        <div className="detail-item">
                          <span className="detail-label">Started:</span>
                          <span className="detail-value">{port.startTime}</span>
                        </div>
                        <div className="detail-item">
                          <span className="detail-label">Est. Completion:</span>
                          <span className="detail-value">{port.endTime}</span>
                        </div>
                        <div className="detail-item full-width">
                          <div className="progress-label">Charging Progress</div>
                          {renderProgressBar(port.progress)}
                        </div>
                      </>
                    )}
                    
                    {port.status === 'reserved' && (
                      <>
                        <div className="detail-item">
                          <span className="detail-label">Reserved For:</span>
                          <span className="detail-value">{port.reservedFor}</span>
                        </div>
                        <div className="detail-item">
                          <span className="detail-label">Duration:</span>
                          <span className="detail-value">{port.duration}</span>
                        </div>
                      </>
                    )}
                    
                    {port.status === 'maintenance' && (
                      <>
                        <div className="detail-item">
                          <span className="detail-label">Note:</span>
                          <span className="detail-value">{port.maintenanceNote}</span>
                        </div>
                        <div className="detail-item">
                          <span className="detail-label">Est. Completion:</span>
                          <span className="detail-value">{port.estimatedCompletion}</span>
                        </div>
                      </>
                    )}
                  </div>
                  
                  <div className="port-actions">
                    {port.status === 'available' && (
                      <>
                        <button className="port-action reserve">Reserve</button>
                        <button className="port-action maintenance">Set Maintenance</button>
                      </>
                    )}
                    
                    {port.status === 'charging' && (
                      <>
                        <button className="port-action stop">Stop Charging</button>
                        <button className="port-action details">View Details</button>
                      </>
                    )}
                    
                    {port.status === 'reserved' && (
                      <>
                        <button className="port-action cancel">Cancel Reservation</button>
                        <button className="port-action edit">Edit Reservation</button>
                      </>
                    )}
                    
                    {port.status === 'maintenance' && (
                      <>
                        <button className="port-action complete">Complete Maintenance</button>
                        <button className="port-action update">Update Status</button>
                      </>
                    )}
                  </div>
                </div>
              ))}
            </div>
          </div>
        )}

        {activeTab === 'energy' && (
          <div className="energy-view">
            <div className="section-header">
              <h2>Energy Management System</h2>
              <div className="header-actions">
                <button className="action-button">
                  <span className="icon">📊</span>
                  <span>Export Data</span>
                </button>
                <div className="time-range-selector">
                  <select>
                    <option value="day">Today</option>
                    <option value="week">This Week</option>
                    <option value="month">This Month</option>
                    <option value="custom">Custom Range</option>
                  </select>
                </div>
              </div>
            </div>
            
            <div className="energy-overview">
              <div className="energy-card current-demand">
                <h3>Current Demand</h3>
                <div className="energy-value">{mockEnergyData.currentDemand} kW</div>
                <div className="energy-chart">
                  <div className="chart-container">
                    {/* Simplified chart representation */}
                    <div className="chart-line">
                      <svg viewBox="0 0 100 30">
                        <path 
                          d="M0,25 L10,20 L20,22 L30,15 L40,18 L50,10 L60,12 L70,8 L80,15 L90,5 L100,10" 
                          className="chart-path"
                        />
                      </svg>
                    </div>
                  </div>
                </div>
                <div className="energy-details">
                  <div className="detail-item">
                    <span className="detail-label">Peak Today:</span>
                    <span className="detail-value">{mockEnergyData.peakDemand} kW</span>
                  </div>
                  <div className="detail-item">
                    <span className="detail-label">Average:</span>
                    <span className="detail-value">780 kW</span>
                  </div>
                </div>
              </div>
              
              <div className="energy-card energy-sources">
                <h3>Energy Sources</h3>
                <div className="sources-chart">
                  <div className="donut-chart">
                    <svg viewBox="0 0 100 100">
                      <circle cx="50" cy="50" r="40" className="donut-ring" />
                      <circle 
                        cx="50" 
                        cy="50" 
                        r="40" 
                        className="donut-segment grid" 
                        style={{ 
                          strokeDasharray: `${mockEnergyData.gridConsumption / 10} 251.2` 
                        }} 
                      />
                      <circle 
                        cx="50" 
                        cy="50" 
                        r="40" 
                        className="donut-segment solar" 
                        style={{ 
                          strokeDasharray: `${mockEnergyData.solarGeneration / 10} 251.2`,
                          strokeDashoffset: `-${mockEnergyData.gridConsumption / 10}` 
                        }} 
                      />
                      <circle 
                        cx="50" 
                        cy="50" 
                        r="40" 
                        className="donut-segment battery" 
                        style={{ 
                          strokeDasharray: `${mockEnergyData.batteryStorage / 10} 251.2`,
                          strokeDashoffset: `-${(mockEnergyData.gridConsumption + mockEnergyData.solarGeneration) / 10}` 
                        }} 
                      />
                    </svg>
                  </div>
                </div>
                <div className="sources-legend">
                  <div className="legend-item grid">
                    <span className="legend-color"></span>
                    <span className="legend-label">Grid</span>
                    <span className="legend-value">{mockEnergyData.gridConsumption} kW</span>
                  </div>
                  <div className="legend-item solar">
                    <span className="legend-color"></span>
                    <span className="legend-label">Solar</span>
                    <span className="legend-value">{mockEnergyData.solarGeneration}%</span>
                  </div>
                  <div className="legend-item battery">
                    <span className="legend-color"></span>
                    <span className="legend-label">Battery</span>
                    <span className="legend-value">{mockEnergyData.batteryStorage}%</span>
                  </div>
                </div>
              </div>
              
              <div className="energy-card efficiency">
                <h3>System Efficiency</h3>
                <div className="efficiency-gauge">
                  <svg viewBox="0 0 120 120" className="gauge">
                    <circle cx="60" cy="60" r="50" className="gauge-background" />
                    <circle 
                      cx="60" 
                      cy="60" 
                      r="50" 
                      className="gauge-progress efficiency" 
                      style={{ 
                        strokeDasharray: `${parseInt(hubStatus.energyEfficiency) * 3.14}px, 314px` 
                      }} 
                    />
                    <text x="60" y="65" textAnchor="middle" className="gauge-text">
                      {hubStatus.energyEfficiency}
                    </text>
                  </svg>
                </div>
                <div className="efficiency-details">
                  <div className="detail-item">
                    <span className="detail-label">Power Factor:</span>
                    <span className="detail-value">0.98</span>
                  </div>
                  <div className="detail-item">
                    <span className="detail-label">Conversion Loss:</span>
                    <span className="detail-value">8%</span>
                  </div>
                </div>
              </div>
            </div>
            
            <div className="energy-daily-chart">
              <h3>24-Hour Energy Demand</h3>
              <div className="chart-container">
                <div className="chart-y-axis">
                  <div className="axis-label">1200 kW</div>
                  <div className="axis-label">900 kW</div>
                  <div className="axis-label">600 kW</div>
                  <div className="axis-label">300 kW</div>
                  <div className="axis-label">0 kW</div>
                </div>
                <div className="chart-content">
                  <div className="chart-bars">
                    {mockEnergyData.dailyUsage.map((hour, index) => (
                      <div key={index} className="chart-bar-container">
                        <div 
                          className="chart-bar" 
                          style={{ height: `${(hour.demand / mockEnergyData.peakDemand) * 100}%` }}
                        >
                          <div className="bar-glow"></div>
                        </div>
                        <div className="bar-label">{hour.hour}</div>
                      </div>
                    ))}
                  </div>
                </div>
              </div>
            </div>
            
            <div className="energy-controls">
              <h3>Energy Management Controls</h3>
              <div className="controls-grid">
                <div className="control-card">
                  <h4>Load Balancing</h4>
                  <div className="control-status">
                    <span className="status-indicator active"></span>
                    <span className="status-text">Active</span>
                  </div>
                  <div className="control-actions">
                    <button className="control-action">Configure</button>
                    <button className="control-action">Disable</button>
                  </div>
                </div>
                
                <div className="control-card">
                  <h4>Peak Shaving</h4>
                  <div className="control-status">
                    <span className="status-indicator active"></span>
                    <span className="status-text">Active</span>
                  </div>
                  <div className="control-actions">
                    <button className="control-action">Configure</button>
                    <button className="control-action">Disable</button>
                  </div>
                </div>
                
                <div className="control-card">
                  <h4>Battery Storage</h4>
                  <div className="control-status">
                    <span className="status-indicator active"></span>
                    <span className="status-text">Discharging</span>
                  </div>
                  <div className="control-actions">
                    <button className="control-action">Switch to Charging</button>
                    <button className="control-action">Set to Auto</button>
                  </div>
                </div>
                
                <div className="control-card">
                  <h4>Grid Connection</h4>
                  <div className="control-status">
                    <span className="status-indicator active"></span>
                    <span className="status-text">Connected</span>
                  </div>
                  <div className="control-actions">
                    <button className="control-action">Emergency Disconnect</button>
                    <button className="control-action">Test Backup</button>
                  </div>
                </div>
              </div>
            </div>
          </div>
        )}

        {/* Additional tabs would be implemented here */}
      </main>
    </div>
  );
}

export default ChargingHub;