import React, { useState, useEffect } from 'react';
import { X, Save, Wrench, User, Calendar, Tag, Hash, Building2 } from 'lucide-react';
import { InstalledPart, Customer } from '../types';

interface InstalledPartModalProps {
  isOpen: boolean;
  onClose: () => void;
  onSave: (part: Omit<InstalledPart, 'id'> | InstalledPart) => Promise<void>;
  customers: Customer[];
  initialPart?: InstalledPart | null;
  defaultCustomerId?: string;
}

export const InstalledPartModal: React.FC<InstalledPartModalProps> = ({
  isOpen,
  onClose,
  onSave,
  customers,
  initialPart,
  defaultCustomerId
}) => {
  const [formData, setFormData] = useState({
    customerId: '',
    name: '',
    category: 'Gas-Brennwertgerät',
    manufacturer: 'Buderus',
    serialNumber: '',
    quantity: 1,
    installedAt: new Date().toISOString().split('T')[0]
  });
  const [isSaving, setIsSaving] = useState(false);
  const [errorMsg, setErrorMsg] = useState('');

  useEffect(() => {
    if (initialPart) {
      setFormData({
        customerId: initialPart.customerId || '',
        name: initialPart.name || '',
        category: initialPart.category || 'Gas-Brennwertgerät',
        manufacturer: initialPart.manufacturer || 'Buderus',
        serialNumber: initialPart.serialNumber || '',
        quantity: initialPart.quantity || 1,
        installedAt: initialPart.installedAt || new Date().toISOString().split('T')[0]
      });
    } else {
      setFormData({
        customerId: defaultCustomerId || (customers.length > 0 ? customers[0].id : ''),
        name: '',
        category: 'Gas-Brennwertgerät',
        manufacturer: 'Buderus',
        serialNumber: '',
        quantity: 1,
        installedAt: new Date().toISOString().split('T')[0]
      });
    }
    setErrorMsg('');
  }, [initialPart, defaultCustomerId, customers, isOpen]);

  if (!isOpen) return null;

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (!formData.customerId) {
      setErrorMsg('Bitte einen Kunden auswählen.');
      return;
    }
    if (!formData.name.trim()) {
      setErrorMsg('Bitte Produktbezeichnung angeben.');
      return;
    }

    try {
      setIsSaving(true);
      setErrorMsg('');
      if (initialPart) {
        await onSave({ ...initialPart, ...formData });
      } else {
        await onSave(formData);
      }
      onClose();
    } catch (err: any) {
      setErrorMsg(err.message || 'Fehler beim Speichern des Geräts');
    } finally {
      setIsSaving(false);
    }
  };

  return (
    <div style={{
      position: 'fixed',
      inset: 0,
      backgroundColor: 'rgba(15, 23, 42, 0.6)',
      backdropFilter: 'blur(4px)',
      zIndex: 100,
      display: 'flex',
      alignItems: 'center',
      justifyContent: 'center',
      padding: '20px'
    }}>
      <div style={{
        backgroundColor: '#ffffff',
        borderRadius: '16px',
        maxWidth: '550px',
        width: '100%',
        maxHeight: '90vh',
        overflowY: 'auto',
        boxShadow: '0 25px 50px -12px rgba(0, 0, 0, 0.25)',
        border: '1px solid #e2e8f0'
      }}>
        {/* Header */}
        <div style={{
          padding: '20px 24px',
          borderBottom: '1px solid #e2e8f0',
          display: 'flex',
          justifyContent: 'space-between',
          alignItems: 'center',
          backgroundColor: '#f8fafc',
          borderTopLeftRadius: '16px',
          borderTopRightRadius: '16px'
        }}>
          <h2 style={{ fontSize: '1.25rem', fontWeight: 700, color: '#0f172a', margin: 0, display: 'flex', alignItems: 'center', gap: '10px' }}>
            <Wrench size={22} color="#2563eb" />
            {initialPart ? 'Verbautes Gerät bearbeiten' : 'Gerät zur Kartei hinzufügen'}
          </h2>
          <button 
            onClick={onClose}
            style={{ background: 'none', border: 'none', cursor: 'pointer', color: '#64748b', borderRadius: '8px', padding: '4px' }}
          >
            <X size={20} />
          </button>
        </div>

        {/* Form Body */}
        <form onSubmit={handleSubmit} style={{ padding: '24px' }}>
          {errorMsg && (
            <div style={{
              backgroundColor: '#fef2f2',
              color: '#991b1b',
              padding: '12px 16px',
              borderRadius: '8px',
              marginBottom: '20px',
              fontSize: '0.9rem',
              fontWeight: 500
            }}>
              {errorMsg}
            </div>
          )}

          {/* Customer */}
          <div style={{ marginBottom: '16px' }}>
            <label style={{ display: 'block', fontSize: '0.85rem', fontWeight: 600, color: '#475569', marginBottom: '6px' }}>
              Zugehöriger Kunde *
            </label>
            <div style={{ position: 'relative' }}>
              <User size={18} color="#94a3b8" style={{ position: 'absolute', left: '12px', top: '12px' }} />
              <select
                value={formData.customerId}
                onChange={(e) => setFormData({ ...formData, customerId: e.target.value })}
                required
                style={{
                  width: '100%',
                  padding: '10px 14px 10px 38px',
                  borderRadius: '8px',
                  border: '1px solid #cbd5e1',
                  fontSize: '0.95rem',
                  backgroundColor: '#ffffff'
                }}
              >
                <option value="" disabled>-- Bitte Kunde auswählen --</option>
                {customers.map((c) => (
                  <option key={c.id} value={c.id}>
                    {c.name} ({c.customerNumber})
                  </option>
                ))}
              </select>
            </div>
          </div>

          {/* Product Name */}
          <div style={{ marginBottom: '16px' }}>
            <label style={{ display: 'block', fontSize: '0.85rem', fontWeight: 600, color: '#475569', marginBottom: '6px' }}>
              Produktbezeichnung / Modell *
            </label>
            <input 
              type="text"
              value={formData.name}
              onChange={(e) => setFormData({ ...formData, name: e.target.value })}
              placeholder="z.B. Logamax plus GB172-24"
              required
              style={{
                width: '100%',
                padding: '10px 14px',
                borderRadius: '8px',
                border: '1px solid #cbd5e1',
                fontSize: '0.95rem'
              }}
            />
          </div>

          {/* Manufacturer & Category */}
          <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: '16px', marginBottom: '16px' }}>
            <div>
              <label style={{ display: 'block', fontSize: '0.85rem', fontWeight: 600, color: '#475569', marginBottom: '6px' }}>
                Hersteller / Marke *
              </label>
              <div style={{ position: 'relative' }}>
                <Building2 size={18} color="#94a3b8" style={{ position: 'absolute', left: '12px', top: '12px' }} />
                <input
                  type="text"
                  value={formData.manufacturer}
                  onChange={(e) => setFormData({ ...formData, manufacturer: e.target.value })}
                  placeholder="z.B. Buderus, Bosch, Viessmann"
                  required
                  style={{
                    width: '100%',
                    padding: '10px 14px 10px 38px',
                    borderRadius: '8px',
                    border: '1px solid #cbd5e1',
                    fontSize: '0.95rem'
                  }}
                />
              </div>
            </div>

            <div>
              <label style={{ display: 'block', fontSize: '0.85rem', fontWeight: 600, color: '#475569', marginBottom: '6px' }}>
                Geräte-Typ / Kategorie
              </label>
              <div style={{ position: 'relative' }}>
                <Tag size={18} color="#94a3b8" style={{ position: 'absolute', left: '12px', top: '12px' }} />
                <input
                  type="text"
                  value={formData.category}
                  onChange={(e) => setFormData({ ...formData, category: e.target.value })}
                  placeholder="z.B. Gas-Brennwertgerät, Raumthermostat"
                  style={{
                    width: '100%',
                    padding: '10px 14px 10px 38px',
                    borderRadius: '8px',
                    border: '1px solid #cbd5e1',
                    fontSize: '0.95rem'
                  }}
                />
              </div>
            </div>
          </div>

          {/* Serial Number & Quantity */}
          <div style={{ display: 'grid', gridTemplateColumns: '1fr 1fr', gap: '16px', marginBottom: '16px' }}>
            <div>
              <label style={{ display: 'block', fontSize: '0.85rem', fontWeight: 600, color: '#475569', marginBottom: '6px' }}>
                Seriennummer
              </label>
              <div style={{ position: 'relative' }}>
                <Hash size={18} color="#94a3b8" style={{ position: 'absolute', left: '12px', top: '12px' }} />
                <input 
                  type="text"
                  value={formData.serialNumber}
                  onChange={(e) => setFormData({ ...formData, serialNumber: e.target.value })}
                  placeholder="8374747383"
                  style={{
                    width: '100%',
                    padding: '10px 14px 10px 38px',
                    borderRadius: '8px',
                    border: '1px solid #cbd5e1',
                    fontSize: '0.95rem'
                  }}
                />
              </div>
            </div>

            <div>
              <label style={{ display: 'block', fontSize: '0.85rem', fontWeight: 600, color: '#475569', marginBottom: '6px' }}>
                Anzahl
              </label>
              <input 
                type="number"
                min={1}
                value={formData.quantity}
                onChange={(e) => setFormData({ ...formData, quantity: parseInt(e.target.value) || 1 })}
                style={{
                  width: '100%',
                  padding: '10px 14px',
                  borderRadius: '8px',
                  border: '1px solid #cbd5e1',
                  fontSize: '0.95rem'
                }}
              />
            </div>
          </div>

          {/* Installed At */}
          <div style={{ marginBottom: '24px' }}>
            <label style={{ display: 'block', fontSize: '0.85rem', fontWeight: 600, color: '#475569', marginBottom: '6px' }}>
              Einbaudatum
            </label>
            <div style={{ position: 'relative' }}>
              <Calendar size={18} color="#94a3b8" style={{ position: 'absolute', left: '12px', top: '12px' }} />
              <input 
                type="date"
                value={formData.installedAt}
                onChange={(e) => setFormData({ ...formData, installedAt: e.target.value })}
                style={{
                  width: '100%',
                  padding: '10px 14px 10px 38px',
                  borderRadius: '8px',
                  border: '1px solid #cbd5e1',
                  fontSize: '0.95rem'
                }}
              />
            </div>
          </div>

          {/* Actions */}
          <div style={{ display: 'flex', justifyContent: 'flex-end', gap: '12px', paddingTop: '16px', borderTop: '1px solid #f1f5f9' }}>
            <button
              type="button"
              onClick={onClose}
              style={{
                padding: '10px 18px',
                borderRadius: '8px',
                border: '1px solid #cbd5e1',
                backgroundColor: '#ffffff',
                color: '#475569',
                fontWeight: 600,
                cursor: 'pointer'
              }}
            >
              Abbrechen
            </button>

            <button
              type="submit"
              disabled={isSaving}
              className="btn-primary-cta"
            >
              <Save size={18} />
              <span>{isSaving ? 'Speichert...' : 'Gerät Speichern'}</span>
            </button>
          </div>
        </form>
      </div>
    </div>
  );
};