import React, { useState, useEffect } from 'react'
import { useAuth } from '../../contexts/AuthContext'
const baseUrl = import.meta.env.VITE_API_URL;

function UserOrder() {

  const { token } = useAuth()
  
  const [orders, setOrders] = useState([])
  const [loading, setLoading] = useState(true)
  const [error, setError] = useState(null)
  const [selectedOrder, setSelectedOrder] = useState(null)
  const [cancelling, setCancelling] = useState(null)
  const [currentPage, setCurrentPage] = useState(1)
  const [ordersPerPage] = useState(10)
  const [searchTerm, setSearchTerm] = useState('')
  const [statusFilter, setStatusFilter] = useState('all')

  // Fetch all orders
  const fetchOrders = async () => {
    try {
      setLoading(true)
      const response = await fetch(`${baseUrl}/customer/orders`, {
        method: 'GET',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`
        }
        // Removed body - GET requests cannot have a body
      })

      if (!response.ok) {
        throw new Error('Failed to fetch orders')
      }

      const data = await response.json()
      if (data.success) {
        setOrders(data.orders)
      } else {
        throw new Error('Failed to fetch orders')
      }
    } catch (err) {
      setError(err.message)
    } finally {
      setLoading(false)
    }
  }

  // Fetch single order details
  const fetchOrderDetails = async (orderId) => {
    try {
      const response = await fetch(`${baseUrl}/customer/orders/${orderId}`, {
        method: 'GET',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`
        }
        // Removed body - GET requests cannot have a body
      })

      if (!response.ok) {
        throw new Error('Failed to fetch order details')
      }

      const data = await response.json()
      if (data.success) {
        setSelectedOrder(data.order)
      }
    } catch (err) {
      setError(err.message)
    }
  }

  // Cancel order
  const cancelOrder = async (orderId) => {
    try {
      setCancelling(orderId)
      const response = await fetch(`${baseUrl}/customer/orders/${orderId}/cancel`, {
        method: 'PUT',
        headers: {
          'Content-Type': 'application/json',
          'Authorization': `Bearer ${token}`
        }
        // You can keep body for PUT requests, but since you're sending token in header, 
        // the body with token is redundant. Remove it unless your API specifically requires it.
        // body: JSON.stringify({ token })
      })

      if (!response.ok) {
        throw new Error('Failed to cancel order')
      }

      // Refresh orders after cancellation
      await fetchOrders()
      if (selectedOrder && selectedOrder._id === orderId) {
        setSelectedOrder(null)
      }
    } catch (err) {
      setError(err.message)
    } finally {
      setCancelling(null)
    }
  }

  useEffect(() => {
    if (token) {
      fetchOrders()
    }
  }, [token])

  // Filter and search orders
  const filteredOrders = orders.filter(order => {
    const matchesSearch = order.items.some(item => 
      item.product.name.toLowerCase().includes(searchTerm.toLowerCase())
    ) || order._id.toLowerCase().includes(searchTerm.toLowerCase())
    
    const matchesStatus = statusFilter === 'all' || order.status === statusFilter
    
    return matchesSearch && matchesStatus
  })

  // Pagination
  const indexOfLastOrder = currentPage * ordersPerPage
  const indexOfFirstOrder = indexOfLastOrder - ordersPerPage
  const currentOrders = filteredOrders.slice(indexOfFirstOrder, indexOfLastOrder)
  const totalPages = Math.ceil(filteredOrders.length / ordersPerPage)

  // Helper functions
  const formatDate = (dateString) => {
    return new Date(dateString).toLocaleDateString('en-IN', {
      year: 'numeric',
      month: 'short',
      day: 'numeric',
      hour: '2-digit',
      minute: '2-digit'
    })
  }

  const getStatusColor = (status) => {
    const colors = {
      'placed': 'bg-blue-100 text-blue-800',
      'confirmed': 'bg-green-100 text-green-800',
      'shipped': 'bg-purple-100 text-purple-800',
      'delivered': 'bg-green-100 text-green-800',
      'cancelled': 'bg-red-100 text-red-800'
    }
    return colors[status] || 'bg-gray-100 text-gray-800'
  }

  const getPaymentStatusColor = (status) => {
    const colors = {
      'pending': 'bg-yellow-100 text-yellow-800',
      'paid': 'bg-green-100 text-green-800',
      'failed': 'bg-red-100 text-red-800'
    }
    return colors[status] || 'bg-gray-100 text-gray-800'
  }

  if (loading) {
    return (
      <div className="flex justify-center items-center min-h-screen">
        <div className="animate-spin rounded-full h-12 w-12 border-b-2 border-green-600"></div>
      </div>
    )
  }

  if (error) {
    return (
      <div className="max-w-6xl mx-auto p-6">
        <div className="bg-red-50 border border-red-200 rounded-lg p-4">
          <h3 className="text-red-800 font-medium">Error</h3>
          <p className="text-red-600">{error}</p>
          <button 
            onClick={fetchOrders}
            className="mt-2 bg-red-600 text-white px-4 py-2 rounded hover:bg-red-700"
          >
            Retry
          </button>
        </div>
      </div>
    )
  }

  return (
    <div className="max-w-6xl mx-auto p-6">
      <h1 className="text-3xl font-bold text-gray-800 mb-6">My Orders</h1>

      {/* Search and Filter */}
      <div className="mb-6 flex flex-col sm:flex-row gap-4">
        <div className="flex-1">
          <input
            type="text"
            placeholder="Search orders by product name or order ID..."
            value={searchTerm}
            onChange={(e) => setSearchTerm(e.target.value)}
            className="w-full px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-transparent"
          />
        </div>
        <select
          value={statusFilter}
          onChange={(e) => setStatusFilter(e.target.value)}
          className="px-4 py-2 border border-gray-300 rounded-lg focus:ring-2 focus:ring-green-500 focus:border-transparent"
        >
          <option value="all">All Status</option>
          <option value="placed">Placed</option>
          <option value="confirmed">Confirmed</option>
          <option value="shipped">Shipped</option>
          <option value="delivered">Delivered</option>
          <option value="cancelled">Cancelled</option>
        </select>
      </div>

      {/* Orders Count */}
      <div className="mb-4 text-gray-600">
        Showing {currentOrders.length} of {filteredOrders.length} orders
      </div>

      {/* Orders List */}
      {currentOrders.length === 0 ? (
        <div className="text-center py-12">
          <div className="text-gray-400 text-6xl mb-4">📦</div>
          <h3 className="text-xl font-medium text-gray-600 mb-2">No orders found</h3>
          <p className="text-gray-500">
            {orders.length === 0 ? "You haven't placed any orders yet." : "No orders match your search criteria."}
          </p>
        </div>
      ) : (
        <div className="space-y-4">
          {currentOrders.map((order) => (
            <div key={order._id} className="bg-white border border-gray-200 rounded-lg shadow-sm hover:shadow-md transition-shadow">
              <div className="p-6">
                <div className="flex flex-col lg:flex-row lg:items-center lg:justify-between mb-4">
                  <div>
                    <h3 className="text-lg font-semibold text-gray-800 mb-1">
                      Order #{order._id.slice(-8)}
                    </h3>
                    <p className="text-gray-600 text-sm">
                      Placed on {formatDate(order.createdAt)}
                    </p>
                  </div>
                  <div className="flex flex-col sm:flex-row gap-2 mt-3 lg:mt-0">
                    <span className={`px-3 py-1 rounded-full text-xs font-medium ${getStatusColor(order.status)}`}>
                      {order.status.charAt(0).toUpperCase() + order.status.slice(1)}
                    </span>
                    <span className={`px-3 py-1 rounded-full text-xs font-medium ${getPaymentStatusColor(order.paymentStatus)}`}>
                      Payment: {order.paymentStatus.charAt(0).toUpperCase() + order.paymentStatus.slice(1)}
                    </span>
                  </div>
                </div>

                {/* Order Items */}
                <div className="mb-4">
                  <h4 className="font-medium text-gray-700 mb-2">Items ({order.items.length})</h4>
                  <div className="space-y-2">
                    {order.items.map((item) => (
                      <div key={item._id} className="flex items-center gap-4 bg-gray-50 p-3 rounded-lg">
                        <img
                          src={item.product.images[0]?.url}
                          alt={item.product.name}
                          className="w-12 h-12 object-cover rounded-lg"
                        />
                        <div className="flex-1">
                          <p className="font-medium text-gray-800">{item.product.name}</p>
                          <p className="text-sm text-gray-600">
                            Farmer: {item.farmer.name} • Qty: {item.quantity} • ₹{item.price}
                          </p>
                        </div>
                      </div>
                    ))}
                  </div>
                </div>

                {/* Shipping Address */}
                <div className="mb-4">
                  <h4 className="font-medium text-gray-700 mb-1">Shipping Address</h4>
                  <p className="text-sm text-gray-600">
                    {order.shippingAddress.street}, {order.shippingAddress.city}, {order.shippingAddress.state} - {order.shippingAddress.zipCode}
                  </p>
                </div>

                {/* Order Total and Actions */}
                <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between pt-4 border-t border-gray-200">
                  <div className="mb-3 sm:mb-0">
                    <span className="text-lg font-bold text-gray-800">Total: ₹{order.totalAmount}</span>
                  </div>
                  <div className="flex gap-2">
                    <button
                      onClick={() => fetchOrderDetails(order._id)}
                      className="px-4 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700 transition-colors"
                    >
                      View Details
                    </button>
                    {order.status === 'placed' && (
                      <button
                        onClick={() => cancelOrder(order._id)}
                        disabled={cancelling === order._id}
                        className="px-4 py-2 bg-red-600 text-white rounded-lg hover:bg-red-700 transition-colors disabled:opacity-50 disabled:cursor-not-allowed"
                      >
                        {cancelling === order._id ? 'Cancelling...' : 'Cancel Order'}
                      </button>
                    )}
                  </div>
                </div>
              </div>
            </div>
          ))}
        </div>
      )}

      {/* Pagination */}
      {totalPages > 1 && (
        <div className="flex justify-center items-center mt-8 gap-2">
          <button
            onClick={() => setCurrentPage(prev => Math.max(prev - 1, 1))}
            disabled={currentPage === 1}
            className="px-4 py-2 border border-gray-300 rounded-lg hover:bg-gray-50 disabled:opacity-50 disabled:cursor-not-allowed"
          >
            Previous
          </button>
          
          <div className="flex gap-1">
            {[...Array(totalPages)].map((_, index) => {
              const pageNum = index + 1
              if (pageNum === 1 || pageNum === totalPages || (pageNum >= currentPage - 1 && pageNum <= currentPage + 1)) {
                return (
                  <button
                    key={pageNum}
                    onClick={() => setCurrentPage(pageNum)}
                    className={`px-3 py-2 rounded-lg ${
                      currentPage === pageNum
                        ? 'bg-green-600 text-white'
                        : 'border border-gray-300 hover:bg-gray-50'
                    }`}
                  >
                    {pageNum}
                  </button>
                )
              } else if (pageNum === currentPage - 2 || pageNum === currentPage + 2) {
                return <span key={pageNum} className="px-2 py-2">...</span>
              }
              return null
            })}
          </div>

          <button
            onClick={() => setCurrentPage(prev => Math.min(prev + 1, totalPages))}
            disabled={currentPage === totalPages}
            className="px-4 py-2 border border-gray-300 rounded-lg hover:bg-gray-50 disabled:opacity-50 disabled:cursor-not-allowed"
          >
            Next
          </button>
        </div>
      )}

      {/* Order Details Modal */}
      {selectedOrder && (
        <div className="fixed inset-0 bg-black bg-opacity-50 flex items-center justify-center p-4 z-50">
          <div className="bg-white rounded-lg max-w-2xl w-full max-h-[90vh] overflow-y-auto">
            <div className="p-6">
              <div className="flex items-center justify-between mb-6">
                <h2 className="text-2xl font-bold text-gray-800">
                  Order Details #{selectedOrder._id.slice(-8)}
                </h2>
                <button
                  onClick={() => setSelectedOrder(null)}
                  className="text-gray-400 hover:text-gray-600 text-2xl"
                >
                  ×
                </button>
              </div>

              {/* Order Status Timeline */}
              <div className="mb-6">
                <h3 className="font-semibold text-gray-700 mb-3">Order Status History</h3>
                <div className="space-y-2">
                  {selectedOrder.statusHistory.map((status, index) => (
                    <div key={status._id} className="flex items-center gap-3">
                      <div className={`w-3 h-3 rounded-full ${index === 0 ? 'bg-green-500' : 'bg-gray-300'}`}></div>
                      <div>
                        <p className="font-medium text-gray-800">
                          {status.status.charAt(0).toUpperCase() + status.status.slice(1)}
                        </p>
                        <p className="text-sm text-gray-600">{formatDate(status.timestamp)}</p>
                        {status.note && <p className="text-sm text-gray-500">{status.note}</p>}
                      </div>
                    </div>
                  ))}
                </div>
              </div>

              {/* Detailed Items */}
              <div className="mb-6">
                <h3 className="font-semibold text-gray-700 mb-3">Order Items</h3>
                <div className="space-y-3">
                  {selectedOrder.items.map((item) => (
                    <div key={item._id} className="flex items-center gap-4 p-4 bg-gray-50 rounded-lg">
                      <img
                        src={item.product.images[0]?.url}
                        alt={item.product.name}
                        className="w-16 h-16 object-cover rounded-lg"
                      />
                      <div className="flex-1">
                        <h4 className="font-medium text-gray-800">{item.product.name}</h4>
                        <p className="text-sm text-gray-600 mb-1">
                          Farmer: {item.farmer.name}
                        </p>
                        {item.farmer.phone && (
                          <p className="text-sm text-gray-600">
                            Contact: {item.farmer.phone}
                          </p>
                        )}
                      </div>
                      <div className="text-right">
                        <p className="font-medium">Qty: {item.quantity}</p>
                        <p className="text-lg font-bold text-green-600">₹{item.price}</p>
                      </div>
                    </div>
                  ))}
                </div>
              </div>

              {/* Shipping & Payment Info */}
              <div className="grid md:grid-cols-2 gap-6 mb-6">
                <div>
                  <h3 className="font-semibold text-gray-700 mb-2">Shipping Address</h3>
                  <div className="bg-gray-50 p-3 rounded-lg">
                    <p className="text-sm text-gray-800">
                      {selectedOrder.shippingAddress.street}<br />
                      {selectedOrder.shippingAddress.city}, {selectedOrder.shippingAddress.state}<br />
                      {selectedOrder.shippingAddress.zipCode}
                    </p>
                  </div>
                </div>
                <div>
                  <h3 className="font-semibold text-gray-700 mb-2">Payment Information</h3>
                  <div className="bg-gray-50 p-3 rounded-lg">
                    <p className="text-sm text-gray-800 mb-1">
                      Status: <span className={`px-2 py-1 rounded text-xs ${getPaymentStatusColor(selectedOrder.paymentStatus)}`}>
                        {selectedOrder.paymentStatus.charAt(0).toUpperCase() + selectedOrder.paymentStatus.slice(1)}
                      </span>
                    </p>
                    <p className="text-lg font-bold text-green-600">Total: ₹{selectedOrder.totalAmount}</p>
                  </div>
                </div>
              </div>

              {/* Action Buttons */}
              <div className="flex gap-3 pt-4 border-t">
                {selectedOrder.status === 'placed' && (
                  <button
                    onClick={() => {
                      cancelOrder(selectedOrder._id)
                      setSelectedOrder(null)
                    }}
                    disabled={cancelling === selectedOrder._id}
                    className="px-4 py-2 bg-red-600 text-white rounded-lg hover:bg-red-700 transition-colors disabled:opacity-50"
                  >
                    {cancelling === selectedOrder._id ? 'Cancelling...' : 'Cancel Order'}
                  </button>
                )}
                <button
                  onClick={() => setSelectedOrder(null)}
                  className="px-4 py-2 bg-gray-600 text-white rounded-lg hover:bg-gray-700 transition-colors"
                >
                  Close
                </button>
              </div>
            </div>
          </div>
        </div>
      )}
    </div>
  )
}

export default UserOrder