'use client'

import { useState, useEffect } from 'react';
import { useRouter } from 'next/navigation';
import { filamentService, colorService } from '@/src/services/api';
import { Filament } from '@/src/types/filament';
import { bambuLabColors, colorsByFinish, getColorHex } from '@/src/data/bambuLabColorsComplete';
import '@/src/styles/select.css';

interface FilamentWithId extends Filament {
  id: string;
  createdAt?: string;
  updatedAt?: string;
  bojaHex?: string;
}

export default function AdminDashboard() {
  const router = useRouter();
  const [filaments, setFilaments] = useState<FilamentWithId[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState('');
  const [editingFilament, setEditingFilament] = useState<FilamentWithId | null>(null);
  const [showAddForm, setShowAddForm] = useState(false);
  const [darkMode, setDarkMode] = useState(false);
  const [mounted, setMounted] = useState(false);
  const [sidebarOpen, setSidebarOpen] = useState(false);

  // Initialize dark mode - default to true for admin
  useEffect(() => {
    setMounted(true);
    const saved = localStorage.getItem('darkMode');
    if (saved !== null) {
      setDarkMode(JSON.parse(saved));
    } else {
      // Default to dark mode for admin
      setDarkMode(true);
    }
  }, []);

  useEffect(() => {
    if (!mounted) return;
    
    localStorage.setItem('darkMode', JSON.stringify(darkMode));
    if (darkMode) {
      document.documentElement.classList.add('dark');
    } else {
      document.documentElement.classList.remove('dark');
    }
  }, [darkMode, mounted]);

  // Check authentication
  useEffect(() => {
    const token = localStorage.getItem('authToken');
    const expiry = localStorage.getItem('tokenExpiry');
    
    if (!token || !expiry || Date.now() > parseInt(expiry)) {
      router.push('/upadaj');
    }
  }, [router]);

  // Fetch filaments
  const fetchFilaments = async () => {
    try {
      setLoading(true);
      const filaments = await filamentService.getAll();
      setFilaments(filaments);
    } catch (err) {
      setError('Greška pri učitavanju filamenata');
      console.error('Fetch error:', err);
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    fetchFilaments();
  }, []);


  const handleSave = async (filament: Partial<FilamentWithId>) => {
    try {
      if (filament.id) {
        await filamentService.update(filament.id, filament);
      } else {
        await filamentService.create(filament);
      }
      
      setEditingFilament(null);
      setShowAddForm(false);
      fetchFilaments();
    } catch (err) {
      setError('Greška pri čuvanju filamenata');
      console.error('Save error:', err);
    }
  };

  const handleDelete = async (id: string) => {
    if (!confirm('Da li ste sigurni da želite obrisati ovaj filament?')) {
      return;
    }

    try {
      await filamentService.delete(id);
      fetchFilaments();
    } catch (err) {
      setError('Greška pri brisanju filamenata');
      console.error('Delete error:', err);
    }
  };

  const handleLogout = () => {
    localStorage.removeItem('authToken');
    localStorage.removeItem('tokenExpiry');
    router.push('/upadaj');
  };

  if (loading) {
    return <div className="min-h-screen bg-gray-50 dark:bg-gray-900 flex items-center justify-center">
      <div className="text-gray-600 dark:text-gray-400">Učitavanje...</div>
    </div>;
  }

  return (
    <div className="min-h-screen bg-gray-50 dark:bg-gray-900 transition-colors">
      <div className="flex relative">
        {/* Mobile menu button */}
        <button
          onClick={() => setSidebarOpen(!sidebarOpen)}
          className="lg:hidden fixed top-4 left-4 z-50 p-2 bg-white dark:bg-gray-800 rounded-md shadow-lg"
        >
          <svg className="w-6 h-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d={sidebarOpen ? "M6 18L18 6M6 6l12 12" : "M4 6h16M4 12h16M4 18h16"} />
          </svg>
        </button>

        {/* Sidebar */}
        <div className={`${sidebarOpen ? 'translate-x-0' : '-translate-x-full'} lg:translate-x-0 transition-transform duration-300 fixed lg:static w-64 bg-white dark:bg-gray-800 shadow-lg h-screen z-40`}>
          <div className="p-6">
            <h2 className="text-xl font-bold text-gray-900 dark:text-white mb-6">Admin Panel</h2>
            <nav className="space-y-2">
              <a
                href="/upadaj/dashboard"
                className="block px-4 py-2 bg-blue-100 dark:bg-blue-900 text-blue-700 dark:text-blue-300 rounded"
              >
                Filamenti
              </a>
              <a
                href="/upadaj/colors"
                className="block px-4 py-2 text-gray-700 dark:text-gray-300 hover:bg-gray-100 dark:hover:bg-gray-700 rounded"
              >
                Boje
              </a>
            </nav>
          </div>
        </div>

        {/* Overlay for mobile */}
        {sidebarOpen && (
          <div 
            className="lg:hidden fixed inset-0 bg-black bg-opacity-50 z-30"
            onClick={() => setSidebarOpen(false)}
          />
        )}

        {/* Main Content */}
        <div className="flex-1 lg:ml-0">
          <header className="bg-white dark:bg-gray-800 shadow transition-colors">
            <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-4 lg:py-6">
              <div className="flex flex-col sm:flex-row justify-between items-start sm:items-center gap-4">
                <h1 className="text-2xl lg:text-3xl font-bold text-gray-900 dark:text-white ml-12 lg:ml-0">Admin Dashboard</h1>
                <div className="flex flex-wrap gap-2 sm:gap-4 w-full sm:w-auto">
                  {!showAddForm && !editingFilament && (
                    <button
                      onClick={() => setShowAddForm(true)}
                      className="flex-1 sm:flex-initial px-3 sm:px-4 py-2 bg-green-500 text-white rounded hover:bg-green-600 text-sm sm:text-base"
                    >
                      Dodaj novi
                    </button>
                  )}
                  <button
                    onClick={() => router.push('/')}
                    className="flex-1 sm:flex-initial px-3 sm:px-4 py-2 bg-blue-500 text-white rounded hover:bg-blue-600 text-sm sm:text-base"
                  >
                    Nazad na sajt
                  </button>
                  {mounted && (
                    <button
                      onClick={() => setDarkMode(!darkMode)}
                      className="px-4 py-2 bg-gray-200 dark:bg-gray-700 text-gray-800 dark:text-gray-200 rounded hover:bg-gray-300 dark:hover:bg-gray-600 transition-colors"
                      title={darkMode ? 'Svetla tema' : 'Tamna tema'}
                    >
                      {darkMode ? '☀️' : '🌙'}
                    </button>
                  )}
                  <button
                    onClick={handleLogout}
                    className="px-4 py-2 bg-red-500 text-white rounded hover:bg-red-600"
                  >
                    Odjava
                  </button>
                </div>
              </div>
            </div>
          </header>

          <main className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
        {error && (
          <div className="mb-4 p-4 bg-red-50 dark:bg-red-900/20 text-red-800 dark:text-red-400 rounded">
            {error}
          </div>
        )}

        {/* Add/Edit Form */}
        {(showAddForm || editingFilament) && (
          <div className="mb-8">
            <FilamentForm
              key={editingFilament?.id || 'new'}
              filament={editingFilament || {}}
              filaments={filaments}
              onSave={handleSave}
              onCancel={() => {
                setEditingFilament(null);
                setShowAddForm(false);
              }}
            />
          </div>
        )}

        {/* Filaments Table */}
        <div className="overflow-x-auto bg-white dark:bg-gray-800 rounded-lg shadow">
          <table className="min-w-full divide-y divide-gray-200 dark:divide-gray-700">
            <thead className="bg-gray-50 dark:bg-gray-700">
              <tr>
                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-300 uppercase tracking-wider">Brand</th>
                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-300 uppercase tracking-wider">Tip</th>
                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-300 uppercase tracking-wider">Finish</th>
                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-300 uppercase tracking-wider">Boja</th>
                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-300 uppercase tracking-wider">Refill</th>
                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-300 uppercase tracking-wider">Vakum</th>
                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-300 uppercase tracking-wider">Otvoreno</th>
                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-300 uppercase tracking-wider">Količina</th>
                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-300 uppercase tracking-wider">Cena</th>
                <th className="px-6 py-3 text-left text-xs font-medium text-gray-500 dark:text-gray-300 uppercase tracking-wider">Akcije</th>
              </tr>
            </thead>
            <tbody className="bg-white dark:bg-gray-800 divide-y divide-gray-200 dark:divide-gray-700">
              {filaments.map((filament) => (
                <tr key={filament.id} className="hover:bg-gray-50 dark:hover:bg-gray-700">
                  <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900 dark:text-gray-100">{filament.brand}</td>
                  <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900 dark:text-gray-100">{filament.tip}</td>
                  <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900 dark:text-gray-100">{filament.finish}</td>
                  <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900 dark:text-gray-100">
                    <div className="flex items-center gap-2">
                      <span>{filament.boja}</span>
                      {filament.bojaHex && (
                        <div 
                          className="w-4 h-4 rounded border border-gray-300 dark:border-gray-600" 
                          style={{ backgroundColor: filament.bojaHex }}
                          title={filament.bojaHex}
                        />
                      )}
                    </div>
                  </td>
                  <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900 dark:text-gray-100">{filament.refill}</td>
                  <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900 dark:text-gray-100">{filament.vakum}</td>
                  <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900 dark:text-gray-100">{filament.otvoreno}</td>
                  <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900 dark:text-gray-100">{filament.kolicina}</td>
                  <td className="px-6 py-4 whitespace-nowrap text-sm text-gray-900 dark:text-gray-100">{filament.cena}</td>
                  <td className="px-6 py-4 whitespace-nowrap text-sm font-medium">
                    <button
                      onClick={() => {
                        console.log('Editing filament:', filament);
                        setEditingFilament(filament);
                        setShowAddForm(false);
                      }}
                      className="text-blue-600 dark:text-blue-400 hover:text-blue-900 dark:hover:text-blue-300 mr-3"
                    >
                      Izmeni
                    </button>
                    <button
                      onClick={() => handleDelete(filament.id)}
                      className="text-red-600 dark:text-red-400 hover:text-red-900 dark:hover:text-red-300"
                    >
                      Obriši
                    </button>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
          </main>
        </div>
      </div>
    </div>
  );
}

// Filament Form Component
function FilamentForm({ 
  filament, 
  filaments,
  onSave, 
  onCancel 
}: { 
  filament: Partial<FilamentWithId>, 
  filaments: FilamentWithId[],
  onSave: (filament: Partial<FilamentWithId>) => void,
  onCancel: () => void 
}) {
  const [formData, setFormData] = useState({
    brand: filament.brand || '',
    tip: filament.tip || '',
    finish: filament.finish || '',
    boja: filament.boja || '',
    bojaHex: filament.bojaHex || '',
    refill: filament.refill || '',
    vakum: filament.vakum || '',
    otvoreno: filament.otvoreno || '',
    kolicina: filament.kolicina || '',
    cena: filament.cena || '',
  });

  const [availableColors, setAvailableColors] = useState<Array<{id: string, name: string, hex: string}>>([]);

  // Load colors from API
  useEffect(() => {
    const loadColors = async () => {
      try {
        const colors = await colorService.getAll();
        setAvailableColors(colors.sort((a: any, b: any) => a.name.localeCompare(b.name)));
      } catch (error) {
        console.error('Error loading colors:', error);
        // Fallback to colors from existing filaments
        const existingColors = [...new Set(filaments.map(f => f.boja).filter(Boolean))];
        const colorObjects = existingColors.map((color, idx) => ({
          id: `existing-${idx}`,
          name: color,
          hex: filaments.find(f => f.boja === color)?.bojaHex || '#000000'
        }));
        setAvailableColors(colorObjects.sort((a, b) => a.name.localeCompare(b.name)));
      }
    };

    loadColors();
    
    // Reload colors when window gets focus (in case user added colors in another tab)
    const handleFocus = () => loadColors();
    window.addEventListener('focus', handleFocus);
    
    return () => window.removeEventListener('focus', handleFocus);
  }, [filaments]);

  // Update form when filament prop changes
  useEffect(() => {
    setFormData({
      brand: filament.brand || '',
      tip: filament.tip || '',
      finish: filament.finish || '',
      boja: filament.boja || '',
      bojaHex: filament.bojaHex || '',
      refill: filament.refill || '',
      vakum: filament.vakum || '',
      otvoreno: filament.otvoreno || '',
      kolicina: filament.kolicina || '',
      cena: filament.cena || '',
    });
  }, [filament]);

  const handleChange = (e: React.ChangeEvent<HTMLInputElement | HTMLSelectElement>) => {
    const { name, value, type } = e.target;
    
    if (type === 'checkbox') {
      const checked = (e.target as HTMLInputElement).checked;
      if (name === 'vakum') {
        setFormData({
          ...formData,
          [name]: checked ? 'vakuum' : ''
        });
      } else if (name === 'otvoreno') {
        setFormData({
          ...formData,
          [name]: checked ? 'otvorena' : ''
        });
      } else if (name === 'refill') {
        setFormData({
          ...formData,
          [name]: checked ? 'Da' : ''
        });
      }
    } else {
      setFormData({
        ...formData,
        [name]: value
      });
    }
  };

  const handleSubmit = (e: React.FormEvent) => {
    e.preventDefault();
    onSave({
      ...filament,
      ...formData
    });
  };

  return (
    <div className="mb-8 p-6 bg-white dark:bg-gray-800 rounded-lg shadow transition-colors">
      <h2 className="text-xl font-bold mb-4 text-gray-900 dark:text-white">
        {filament.id ? 'Izmeni filament' : 'Dodaj novi filament'}
      </h2>
      <form onSubmit={handleSubmit} className="grid grid-cols-1 md:grid-cols-2 gap-4">
        <div>
          <label className="block text-sm font-medium mb-1 text-gray-700 dark:text-gray-300">Brand</label>
          <select
            name="brand"
            value={formData.brand}
            onChange={handleChange}
            required
            className="custom-select w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-blue-500"
          >
            <option value="">Izaberi brand</option>
            <option value="Bambu Lab">Bambu Lab</option>
            <option value="PolyMaker">PolyMaker</option>
            <option value="Prusament">Prusament</option>
            <option value="SUNLU">SUNLU</option>
            <option value="eSUN">eSUN</option>
            <option value="ELEGOO">ELEGOO</option>
            <option value="GEEETECH">GEEETECH</option>
            <option value="Creality">Creality</option>
          </select>
        </div>
        
        <div>
          <label className="block text-sm font-medium mb-1 text-gray-700 dark:text-gray-300">Tip</label>
          <select
            name="tip"
            value={formData.tip}
            onChange={handleChange}
            required
            className="custom-select w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-blue-500"
          >
            <option value="">Izaberi tip</option>
            <option value="PLA">PLA</option>
            <option value="PETG">PETG</option>
            <option value="ABS">ABS</option>
            <option value="TPU">TPU</option>
          </select>
        </div>

        <div>
          <label className="block text-sm font-medium mb-1 text-gray-700 dark:text-gray-300">Finish</label>
          <select
            name="finish"
            value={formData.finish}
            onChange={handleChange}
            required
            className="custom-select w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-blue-500"
          >
            <option value="">Izaberi finish</option>
            <option value="Basic">Basic</option>
            <option value="Matte">Matte</option>
            <option value="Silk">Silk</option>
            <option value="Metal">Metal</option>
            <option value="Sparkle">Sparkle</option>
            <option value="Glow">Glow</option>
            <option value="Transparent">Transparent</option>
            <option value="Support">Support</option>
          </select>
        </div>

        <div>
          <label className="block text-sm font-medium mb-1 text-gray-700 dark:text-gray-300">Boja</label>
          <select
            name="boja"
            value={formData.boja}
            onChange={(e) => {
              const selectedColorName = e.target.value;
              let hexValue = formData.bojaHex;
              
              // Only use Bambu Lab colors if BambuLab brand is selected
              if (formData.brand === 'BambuLab') {
                const bambuHex = getColorHex(selectedColorName);
                if (bambuHex !== "#000000") {
                  hexValue = bambuHex;
                }
              }
              
              // Check available colors from database
              const dbColor = availableColors.find(c => c.name === selectedColorName);
              if (dbColor && hexValue === formData.bojaHex) {
                hexValue = dbColor.hex;
              }
              
              setFormData({
                ...formData,
                boja: selectedColorName,
                bojaHex: hexValue
              });
            }}
            required
            className="custom-select w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-blue-500"
          >
            <option value="">Izaberite boju</option>
            {/* Show Bambu Lab colors only when BambuLab brand is selected */}
            {formData.brand === 'BambuLab' && formData.finish && colorsByFinish[formData.finish as keyof typeof colorsByFinish] && (
              <optgroup label={`Bambu Lab ${formData.finish} boje`}>
                {colorsByFinish[formData.finish as keyof typeof colorsByFinish].map(colorName => (
                  <option key={`bambu-${colorName}`} value={colorName}>
                    {colorName}
                  </option>
                ))}
              </optgroup>
            )}
            {/* Show all available colors from database */}
            {availableColors.length > 0 && (
              <optgroup label={formData.brand === 'BambuLab' ? 'Ostale boje' : 'Dostupne boje'}>
                {availableColors.map(color => (
                  <option key={color.id} value={color.name}>
                    {color.name}
                  </option>
                ))}
              </optgroup>
            )}
            <option value="custom">Druga boja...</option>
          </select>
        </div>

        <div>
          <label className="block text-sm font-medium mb-1 text-gray-700 dark:text-gray-300">
            {formData.boja && formData.boja !== 'custom' ? `Hex kod za ${formData.boja}` : 'Hex kod boje'}
          </label>
          <div className="flex items-center gap-2">
            <input
              type="color"
              name="bojaHex"
              value={formData.bojaHex || '#000000'}
              onChange={handleChange}
              disabled={!!(formData.brand === 'BambuLab' && formData.boja && formData.boja !== 'custom' && getColorHex(formData.boja) !== "#000000")}
              className="w-full h-10 px-1 py-1 border border-gray-300 dark:border-gray-600 rounded-md bg-white dark:bg-gray-700 cursor-pointer disabled:opacity-50 disabled:cursor-not-allowed"
            />
            {formData.bojaHex && (
              <span className="text-sm text-gray-600 dark:text-gray-400">{formData.bojaHex}</span>
            )}
          </div>
        </div>

        <div>
          <label className="block text-sm font-medium mb-1 text-gray-700 dark:text-gray-300">Količina</label>
          <input
            type="number"
            name="kolicina"
            value={formData.kolicina}
            onChange={handleChange}
            min="0"
            step="1"
            placeholder="0"
            className="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-blue-500"
          />
        </div>

        {/* Cena and Checkboxes on same line */}
        <div className="md:col-span-2 grid grid-cols-1 md:grid-cols-2 gap-4">
          <div>
            <label className="block text-sm font-medium mb-1 text-gray-700 dark:text-gray-300">Cena</label>
            <input
              type="text"
              name="cena"
              value={formData.cena}
              onChange={handleChange}
              placeholder="npr. 2500"
              className="w-full px-3 py-2 border border-gray-300 dark:border-gray-600 rounded-md bg-white dark:bg-gray-700 text-gray-900 dark:text-gray-100 focus:outline-none focus:ring-2 focus:ring-blue-500"
            />
          </div>
          
          {/* Checkboxes grouped together horizontally */}
          <div className="flex items-end gap-6">
            <label className="flex items-center space-x-2 text-sm font-medium text-gray-700 dark:text-gray-300 cursor-pointer">
              <input
                type="checkbox"
                name="refill"
                checked={formData.refill.toLowerCase() === 'da'}
                onChange={handleChange}
                className="w-5 h-5 text-blue-600 bg-gray-100 border-gray-300 rounded focus:ring-blue-500 dark:focus:ring-blue-600 dark:ring-offset-gray-800 focus:ring-2 dark:bg-gray-700 dark:border-gray-600"
              />
              <span>Refill</span>
            </label>

            <label className="flex items-center space-x-2 text-sm font-medium text-gray-700 dark:text-gray-300 cursor-pointer">
              <input
                type="checkbox"
                name="vakum"
                checked={formData.vakum.toLowerCase().includes('vakuum')}
                onChange={handleChange}
                className="w-5 h-5 text-blue-600 bg-gray-100 border-gray-300 rounded focus:ring-blue-500 dark:focus:ring-blue-600 dark:ring-offset-gray-800 focus:ring-2 dark:bg-gray-700 dark:border-gray-600"
              />
              <span>Vakuum</span>
            </label>

            <label className="flex items-center space-x-2 text-sm font-medium text-gray-700 dark:text-gray-300 cursor-pointer">
              <input
                type="checkbox"
                name="otvoreno"
                checked={formData.otvoreno.toLowerCase().includes('otvorena')}
                onChange={handleChange}
                className="w-5 h-5 text-blue-600 bg-gray-100 border-gray-300 rounded focus:ring-blue-500 dark:focus:ring-blue-600 dark:ring-offset-gray-800 focus:ring-2 dark:bg-gray-700 dark:border-gray-600"
              />
              <span>Otvoreno</span>
            </label>
          </div>
        </div>

        <div className="md:col-span-2 flex justify-end gap-4 mt-4">
          <button
            type="button"
            onClick={onCancel}
            className="px-4 py-2 bg-gray-300 dark:bg-gray-600 text-gray-700 dark:text-gray-200 rounded hover:bg-gray-400 dark:hover:bg-gray-500 transition-colors"
          >
            Otkaži
          </button>
          <button
            type="submit"
            className="px-4 py-2 bg-blue-500 text-white rounded hover:bg-blue-600 transition-colors"
          >
            Sačuvaj
          </button>
        </div>
      </form>
    </div>
  );
}