import React, { useEffect, useState } from 'react';
import { Plus, Search, Edit, Trash2, X, Tag } from 'lucide-react';
import { promotionService, Promotion } from '../../services/api';
import { toast } from 'react-toastify';
import Loading from '../../components/common/Loading';
import Pagination from '../../components/common/Pagination';
import { useFormatCurrency } from '../../hooks/useFormatCurrency';
import { useCurrency } from '../../contexts/CurrencyContext';

const PromotionManagementPage: React.FC = () => {
  const { currency } = useCurrency();
  const { formatCurrency } = useFormatCurrency();
  const [promotions, setPromotions] = useState<Promotion[]>([]);
  const [loading, setLoading] = useState(true);
  const [showModal, setShowModal] = useState(false);
  const [editingPromotion, setEditingPromotion] = useState<Promotion | null>(null);
  const [filters, setFilters] = useState({
    search: '',
    status: '',
    type: '',
  });
  const [currentPage, setCurrentPage] = useState(1);
  const [totalPages, setTotalPages] = useState(1);
  const [totalItems, setTotalItems] = useState(0);
  const itemsPerPage = 5;

  const [formData, setFormData] = useState({
    code: '',
    name: '',
    description: '',
    discount_type: 'percentage' as 'percentage' | 'fixed',
    discount_value: 0,
    min_booking_amount: 0,
    max_discount_amount: 0,
    start_date: '',
    end_date: '',
    usage_limit: 0,
    status: 'active' as 'active' | 'inactive' | 'expired',
  });

  useEffect(() => {
    setCurrentPage(1);
  }, [filters]);

  useEffect(() => {
    fetchPromotions();
  }, [filters, currentPage]);

  const fetchPromotions = async () => {
    try {
      setLoading(true);
      const response = await promotionService.getPromotions({
        ...filters,
        page: currentPage,
        limit: itemsPerPage,
      });
      setPromotions(response.data.promotions);
      if (response.data.pagination) {
        setTotalPages(response.data.pagination.totalPages);
        setTotalItems(response.data.pagination.total);
      }
    } catch (error: any) {
      toast.error(error.response?.data?.message || 'Unable to load promotions list');
    } finally {
      setLoading(false);
    }
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    try {
      if (editingPromotion) {
        await promotionService.updatePromotion(editingPromotion.id, formData);
        toast.success('Promotion updated successfully');
      } else {
        await promotionService.createPromotion(formData);
        toast.success('Promotion added successfully');
      }
      setShowModal(false);
      resetForm();
      fetchPromotions();
    } catch (error: any) {
      toast.error(error.response?.data?.message || 'An error occurred');
    }
  };

  const handleEdit = (promotion: Promotion) => {
    setEditingPromotion(promotion);
    setFormData({
      code: promotion.code,
      name: promotion.name,
      description: promotion.description || '',
      discount_type: promotion.discount_type,
      discount_value: promotion.discount_value,
      min_booking_amount: promotion.min_booking_amount || 0,
      max_discount_amount: promotion.max_discount_amount || 0,
      start_date: promotion.start_date?.split('T')[0] || '',
      end_date: promotion.end_date?.split('T')[0] || '',
      usage_limit: promotion.usage_limit || 0,
      status: promotion.status,
    });
    setShowModal(true);
  };

  const handleDelete = async (id: number) => {
    if (!window.confirm('Are you sure you want to delete this promotion?')) return;
    
    try {
      await promotionService.deletePromotion(id);
      toast.success('Promotion deleted successfully');
      fetchPromotions();
    } catch (error: any) {
      toast.error(error.response?.data?.message || 'Unable to delete promotion');
    }
  };

  const resetForm = () => {
    setEditingPromotion(null);
    setFormData({
      code: '',
      name: '',
      description: '',
      discount_type: 'percentage',
      discount_value: 0,
      min_booking_amount: 0,
      max_discount_amount: 0,
      start_date: '',
      end_date: '',
      usage_limit: 0,
      status: 'active',
    });
  };

  const getStatusBadge = (status: string) => {
    const badges: Record<string, { bg: string; text: string; label: string; border: string }> = {
      active: { 
        bg: 'bg-gradient-to-r from-emerald-50 to-green-50', 
        text: 'text-emerald-800', 
        label: 'Active',
        border: 'border-emerald-200'
      },
      inactive: { 
        bg: 'bg-gradient-to-r from-slate-50 to-gray-50', 
        text: 'text-slate-700', 
        label: 'Inactive',
        border: 'border-slate-200'
      },
      expired: {
        bg: 'bg-gradient-to-r from-rose-50 to-red-50',
        text: 'text-rose-800',
        label: 'Expired',
        border: 'border-rose-200'
      },
    };
    const badge = badges[status] || badges.active;
    return (
      <span className={`px-4 py-1.5 rounded-full text-xs font-semibold border shadow-sm ${badge.bg} ${badge.text} ${badge.border}`}>
        {badge.label}
      </span>
    );
  };

  if (loading) {
    return <Loading />;
  }

  return (
    <div className="space-y-8 bg-gradient-to-br from-slate-50 via-white to-slate-50 min-h-screen -m-6 p-8">
      {}
      <div className="flex justify-between items-center animate-fade-in">
        <div>
          <div className="flex items-center gap-3 mb-2">
            <div className="h-1 w-16 bg-gradient-to-r from-amber-400 to-amber-600 rounded-full"></div>
            <h1 className="text-4xl font-bold bg-gradient-to-r from-slate-900 via-slate-800 to-slate-900 bg-clip-text text-transparent tracking-tight">
              Promotion Management
            </h1>
          </div>
          <p className="text-slate-600 mt-3 text-lg font-light">Manage discount codes and promotion programs</p>
        </div>
        <button
          onClick={() => {
            resetForm();
            setShowModal(true);
          }}
          className="flex items-center gap-2 px-6 py-3 bg-gradient-to-r from-amber-500 to-amber-600 text-white rounded-xl font-semibold hover:from-amber-600 hover:to-amber-700 transition-all duration-200 shadow-lg hover:shadow-xl"
        >
          <Plus className="w-5 h-5" />
          Add Promotion
        </button>
      </div>

      {}
      <div className="bg-white/80 backdrop-blur-sm rounded-2xl shadow-xl border border-slate-200/60 p-6 animate-fade-in" style={{ animationDelay: '0.1s' }}>
        <div className="grid grid-cols-1 md:grid-cols-4 gap-5">
          <div className="relative group">
            <Search className="absolute left-4 top-1/2 transform -translate-y-1/2 text-slate-400 w-5 h-5 group-focus-within:text-amber-500 transition-colors" />
            <input
              type="text"
              placeholder="Search by code or name..."
              value={filters.search}
              onChange={(e) => setFilters({ ...filters, search: e.target.value })}
              className="w-full pl-12 pr-4 py-3.5 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 placeholder-slate-400 font-medium shadow-sm hover:shadow-md"
            />
          </div>
          <select
            value={filters.type}
            onChange={(e) => setFilters({ ...filters, type: e.target.value })}
            className="px-4 py-3.5 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm hover:shadow-md cursor-pointer"
          >
            <option value="">All Types</option>
            <option value="percentage">Percentage</option>
            <option value="fixed">Fixed Amount</option>
          </select>
          <select
            value={filters.status}
            onChange={(e) => setFilters({ ...filters, status: e.target.value })}
            className="px-4 py-3.5 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm hover:shadow-md cursor-pointer"
          >
            <option value="">All Statuses</option>
            <option value="active">Active</option>
            <option value="inactive">Inactive</option>
          </select>
        </div>
      </div>

      {}
      <div className="bg-white/80 backdrop-blur-sm rounded-2xl shadow-xl border border-slate-200/60 overflow-hidden animate-fade-in" style={{ animationDelay: '0.2s' }}>
        <div className="overflow-x-auto">
          <table className="w-full">
            <thead>
              <tr className="bg-gradient-to-r from-slate-900 via-slate-800 to-slate-900">
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">Code</th>
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">Program Name</th>
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">Value</th>
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">Period</th>
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">Used</th>
                <th className="px-8 py-5 text-left text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">Status</th>
                <th className="px-8 py-5 text-right text-xs font-bold text-amber-100 uppercase tracking-wider border-b border-slate-700">Actions</th>
              </tr>
            </thead>
            <tbody className="bg-white divide-y divide-slate-100">
              {promotions.map((promotion, index) => (
                <tr 
                  key={promotion.id} 
                  className="hover:bg-gradient-to-r hover:from-amber-50/30 hover:to-yellow-50/30 transition-all duration-200 group border-b border-slate-100"
                  style={{ animationDelay: `${index * 0.05}s` }}
                >
                  <td className="px-8 py-5 whitespace-nowrap">
                    <div className="flex items-center gap-3">
                      <div className="p-2 bg-gradient-to-br from-amber-100 to-amber-200 rounded-lg">
                        <Tag className="w-4 h-4 text-amber-600" />
                      </div>
                      <span className="text-sm font-mono font-bold bg-gradient-to-r from-amber-600 to-amber-700 bg-clip-text text-transparent">{promotion.code}</span>
                    </div>
                  </td>
                  <td className="px-8 py-5">
                    <div className="text-sm font-semibold text-slate-900">{promotion.name}</div>
                    <div className="text-xs text-slate-500 mt-0.5">{promotion.description}</div>
                  </td>
                  <td className="px-8 py-5 whitespace-nowrap">
                    <div className="text-sm font-bold bg-gradient-to-r from-emerald-600 to-emerald-700 bg-clip-text text-transparent">
                      {promotion.discount_type === 'percentage' 
                        ? `${promotion.discount_value}%` 
                        : formatCurrency(promotion.discount_value)}
                    </div>
                  </td>
                  <td className="px-8 py-5 whitespace-nowrap">
                    <div className="text-xs text-slate-600">
                      {promotion.start_date ? new Date(promotion.start_date).toLocaleDateString('en-US', { month: 'short', day: 'numeric' }) : 'N/A'}
                      <span className="text-slate-400 mx-1">→</span>
                      {promotion.end_date ? new Date(promotion.end_date).toLocaleDateString('en-US', { month: 'short', day: 'numeric' }) : 'N/A'}
                    </div>
                  </td>
                  <td className="px-8 py-5 whitespace-nowrap">
                    <div className="text-sm font-medium text-slate-700">
                      <span className="text-amber-600 font-semibold">{promotion.used_count || 0}</span>
                      <span className="text-slate-400 mx-1">/</span>
                      <span className="text-slate-600">{promotion.usage_limit || '∞'}</span>
                    </div>
                  </td>
                  <td className="px-8 py-5 whitespace-nowrap">
                    {getStatusBadge(promotion.status)}
                  </td>
                  <td className="px-8 py-5 whitespace-nowrap text-right">
                    <div className="flex items-center justify-end gap-2">
                      <button
                        onClick={() => handleEdit(promotion)}
                        className="p-2 rounded-lg text-blue-600 hover:text-blue-700 hover:bg-blue-50 transition-all duration-200 shadow-sm hover:shadow-md border border-blue-200 hover:border-blue-300"
                        title="Edit"
                      >
                        <Edit className="w-5 h-5" />
                      </button>
                      <button
                        onClick={() => handleDelete(promotion.id)}
                        className="p-2 rounded-lg text-rose-600 hover:text-rose-700 hover:bg-rose-50 transition-all duration-200 shadow-sm hover:shadow-md border border-rose-200 hover:border-rose-300"
                        title="Delete"
                      >
                        <Trash2 className="w-5 h-5" />
                      </button>
                    </div>
                  </td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>
        <Pagination
          currentPage={currentPage}
          totalPages={totalPages}
          onPageChange={setCurrentPage}
          totalItems={totalItems}
          itemsPerPage={itemsPerPage}
        />
      </div>

      {}
      {showModal && (
        <div className="fixed inset-0 bg-black/70 backdrop-blur-md flex items-center justify-center z-50 p-4 animate-fade-in">
          <div className="bg-white rounded-3xl shadow-2xl w-full max-w-3xl max-h-[90vh] overflow-hidden border border-slate-200 animate-scale-in">
            {}
            <div className="bg-gradient-to-r from-slate-900 via-slate-800 to-slate-900 px-8 py-6 border-b border-slate-700">
              <div className="flex justify-between items-center">
                <div>
                  <h2 className="text-3xl font-bold text-amber-100 mb-1">
                    {editingPromotion ? 'Update Promotion' : 'Add New Promotion'}
                  </h2>
                  <p className="text-amber-200/80 text-sm font-light">
                    {editingPromotion ? 'Modify promotion details' : 'Create a new promotion program'}
                  </p>
                </div>
                <button 
                  onClick={() => setShowModal(false)}
                  className="w-10 h-10 flex items-center justify-center rounded-xl text-amber-100 hover:text-white hover:bg-slate-700/50 transition-all duration-200 border border-slate-600 hover:border-amber-400"
                >
                  <X className="w-6 h-6" />
                </button>
              </div>
            </div>
            
            {}
            <div className="p-8 overflow-y-auto max-h-[calc(90vh-120px)] custom-scrollbar">
              <form onSubmit={handleSubmit} className="space-y-6">
                <div className="grid grid-cols-2 gap-6">
                  <div>
                    <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                      Code <span className="text-rose-500">*</span>
                    </label>
                    <input
                      type="text"
                      value={formData.code}
                      onChange={(e) => setFormData({ ...formData, code: e.target.value.toUpperCase() })}
                      className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm font-mono"
                      placeholder="e.g: SUMMER2024"
                      required
                    />
                  </div>
                  <div>
                    <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                      Program Name <span className="text-rose-500">*</span>
                    </label>
                    <input
                      type="text"
                      value={formData.name}
                      onChange={(e) => setFormData({ ...formData, name: e.target.value })}
                      className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                      placeholder="e.g: Summer Sale"
                      required
                    />
                  </div>
                </div>

                <div>
                  <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                    Description
                  </label>
                  <textarea
                    value={formData.description}
                    onChange={(e) => setFormData({ ...formData, description: e.target.value })}
                    className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                    rows={3}
                    placeholder="Detailed description of the program..."
                  />
                </div>

                <div className="grid grid-cols-2 gap-6">
                  <div>
                    <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                      Discount Type <span className="text-rose-500">*</span>
                    </label>
                    <select
                      value={formData.discount_type}
                      onChange={(e) => setFormData({ ...formData, discount_type: e.target.value as 'percentage' | 'fixed' })}
                      className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm cursor-pointer"
                    >
                      <option value="percentage">Percentage (%)</option>
                      <option value="fixed">Fixed Amount ({currency})</option>
                    </select>
                  </div>
                  <div>
                    <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                      Discount Value <span className="text-rose-500">*</span>
                    </label>
                    <input
                      type="number"
                      value={formData.discount_value}
                      onChange={(e) => setFormData({ ...formData, discount_value: parseFloat(e.target.value) })}
                      className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                      min="0"
                      max={formData.discount_type === 'percentage' ? 100 : undefined}
                      required
                    />
                  </div>
                </div>

                <div className="grid grid-cols-2 gap-6">
                  <div>
                    <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                      Minimum Order Value ({currency})
                    </label>
                    <input
                      type="number"
                      value={formData.min_booking_amount}
                      onChange={(e) => setFormData({ ...formData, min_booking_amount: parseFloat(e.target.value) })}
                      className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                      min="0"
                    />
                  </div>
                  <div>
                    <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                      Maximum Discount ({currency})
                    </label>
                    <input
                      type="number"
                      value={formData.max_discount_amount}
                      onChange={(e) => setFormData({ ...formData, max_discount_amount: parseFloat(e.target.value) })}
                      className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                      min="0"
                    />
                  </div>
                </div>

                <div className="grid grid-cols-2 gap-6">
                  <div>
                    <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                      Start Date <span className="text-rose-500">*</span>
                    </label>
                    <input
                      type="date"
                      value={formData.start_date}
                      onChange={(e) => setFormData({ ...formData, start_date: e.target.value })}
                      className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                      required
                    />
                  </div>
                  <div>
                    <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                      End Date <span className="text-rose-500">*</span>
                    </label>
                    <input
                      type="date"
                      value={formData.end_date}
                      onChange={(e) => setFormData({ ...formData, end_date: e.target.value })}
                      className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                      required
                    />
                  </div>
                </div>

                <div className="grid grid-cols-2 gap-6">
                  <div>
                    <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                      Usage Limit (0 = unlimited)
                    </label>
                    <input
                      type="number"
                      value={formData.usage_limit}
                      onChange={(e) => setFormData({ ...formData, usage_limit: parseInt(e.target.value) })}
                      className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm"
                      min="0"
                    />
                  </div>
                  <div>
                    <label className="block text-xs font-semibold text-slate-600 uppercase tracking-wider mb-2">
                      Status
                    </label>
                    <select
                      value={formData.status}
                      onChange={(e) => setFormData({ ...formData, status: e.target.value as 'active' | 'inactive' })}
                      className="w-full px-4 py-3 bg-white border-2 border-slate-200 rounded-xl focus:border-amber-400 focus:ring-4 focus:ring-amber-100 transition-all duration-200 text-slate-700 font-medium shadow-sm cursor-pointer"
                    >
                      <option value="active">Active</option>
                      <option value="inactive">Inactive</option>
                    </select>
                  </div>
                </div>

                <div className="flex justify-end gap-3 pt-6 border-t border-slate-200">
                  <button
                    type="button"
                    onClick={() => setShowModal(false)}
                    className="px-8 py-3 border-2 border-slate-300 rounded-xl text-slate-700 font-semibold hover:bg-slate-50 transition-all duration-200 shadow-sm hover:shadow-md"
                  >
                    Cancel
                  </button>
                  <button
                    type="submit"
                    className="px-8 py-3 bg-gradient-to-r from-amber-500 to-amber-600 text-white rounded-xl font-semibold hover:from-amber-600 hover:to-amber-700 transition-all duration-200 shadow-lg hover:shadow-xl"
                  >
                    {editingPromotion ? 'Update' : 'Create'}
                  </button>
                </div>
              </form>
            </div>
          </div>
        </div>
      )}
    </div>
  );
};

export default PromotionManagementPage;
