import React, { useState } from 'react'
import { FaCog, FaPlus, FaEdit, FaTrash, FaClock, FaCheckCircle, FaPlay } from 'react-icons/fa'
import { MrpWorkOrder } from '../../../types/mrp'
import DataTable, { Column } from '../../../components/common/DataTable'
import { mockWorkOrders } from '../../../mocks/mockWorkOrders'
import NewWorkOrderForm from './NewWorkOrderForm'
import EditWorkOrderForm from './EditWorkOrderForm'
import ViewWorkOrderModal from './ViewWorkOrderModal'
import CompleteWorkOrderModal from './CompleteWorkOrderModal'
import Widget from '../../../components/common/Widget'
import { PriorityEnum } from '../../../types/common'
import {
  getPriorityColor,
  getPriorityText,
  getWorkOrderStatusColor,
  getWorkOrderStatusText,
} from '../../../utils/erp'
import { WorkOrderStatusEnum } from '../../../types/pm'
import { Container } from '@/components/shared'

const WorkOrders: React.FC = () => {
  const [workOrders, setWorkOrders] = useState<MrpWorkOrder[]>(mockWorkOrders)

  const [searchTerm, setSearchTerm] = useState('')
  const [selectedStatus, setSelectedStatus] = useState<WorkOrderStatusEnum | 'all'>('all')
  const [selectedPriority, setSelectedPriority] = useState<PriorityEnum | 'all'>('all')

  // Modal states
  const [isNewWorkOrderOpen, setIsNewWorkOrderOpen] = useState(false)
  const [isEditWorkOrderOpen, setIsEditWorkOrderOpen] = useState(false)
  const [isViewWorkOrderOpen, setIsViewWorkOrderOpen] = useState(false)
  const [isCompleteWorkOrderOpen, setIsCompleteWorkOrderOpen] = useState(false)
  const [selectedWorkOrder, setSelectedWorkOrder] = useState<MrpWorkOrder | null>(null)

  // Event handlers
  const handleAdd = () => {
    setIsNewWorkOrderOpen(true)
  }

  const handleEdit = (workOrder: MrpWorkOrder) => {
    setSelectedWorkOrder(workOrder)
    setIsEditWorkOrderOpen(true)
  }

  const handleDelete = (id: string) => {
    if (window.confirm('Bu iş emrini silmek istediğinizden emin misiniz?')) {
      setWorkOrders((prev) => prev.filter((wo) => wo.id !== id))
    }
  }

  const handleStart = (workOrder: MrpWorkOrder) => {
    setWorkOrders((prev) =>
      prev.map((wo) =>
        wo.id === workOrder.id
          ? {
              ...wo,
              status: WorkOrderStatusEnum.InProgress,
              lastModificationTime: new Date(),
            }
          : wo,
      ),
    )
  }

  const handleComplete = (workOrder: MrpWorkOrder) => {
    setSelectedWorkOrder(workOrder)
    setIsCompleteWorkOrderOpen(true)
  }

  const handleViewDetails = (workOrder: MrpWorkOrder) => {
    setSelectedWorkOrder(workOrder)
    setIsViewWorkOrderOpen(true)
  }

  // Modal handlers
  const handleNewWorkOrderSave = (
    newWorkOrderData: Omit<MrpWorkOrder, 'id' | 'creationTime' | 'lastModificationTime'>,
  ) => {
    const newWorkOrder: MrpWorkOrder = {
      ...newWorkOrderData,
      id: `WO-${Date.now()}`,
      creationTime: new Date(),
      lastModificationTime: new Date(),
    }
    setWorkOrders((prev) => [...prev, newWorkOrder])
  }

  const handleEditWorkOrderSave = (updatedWorkOrder: MrpWorkOrder) => {
    setWorkOrders((prev) =>
      prev.map((wo) => (wo.id === updatedWorkOrder.id ? updatedWorkOrder : wo)),
    )
  }

  const handleCompleteWorkOrder = (
    workOrderId: string,
    confirmedQuantity: number,
    scrapQuantity: number,
  ) => {
    setWorkOrders((prev) =>
      prev.map((wo) => {
        if (wo.id === workOrderId) {
          const newConfirmedQuantity = wo.confirmedQuantity + confirmedQuantity
          const newScrapQuantity = wo.scrapQuantity + scrapQuantity
          const newStatus =
            newConfirmedQuantity + newScrapQuantity >= wo.plannedQuantity
              ? WorkOrderStatusEnum.Completed
              : wo.status

          return {
            ...wo,
            confirmedQuantity: newConfirmedQuantity,
            scrapQuantity: newScrapQuantity,
            status: newStatus,
            lastModificationTime: new Date(),
          }
        }
        return wo
      }),
    )
  }

  const filteredWorkOrders = workOrders.filter((workOrder) => {
    if (
      searchTerm &&
      !workOrder.workOrderNumber.toLowerCase().includes(searchTerm.toLowerCase()) &&
      !workOrder.productionOrder?.orderNumber?.toLowerCase().includes(searchTerm.toLowerCase())
    ) {
      return false
    }
    if (selectedStatus !== 'all' && workOrder.status !== selectedStatus) {
      return false
    }
    if (selectedPriority !== 'all' && workOrder.productionOrder?.priority !== selectedPriority) {
      return false
    }
    return true
  })

  const columns: Column<MrpWorkOrder>[] = [
    {
      key: 'workOrderNumber',
      header: 'İş Emri No',
      sortable: true,
      render: (workOrder: MrpWorkOrder) => (
        <div>
          <div className="font-medium text-gray-900">{workOrder.workOrderNumber}</div>
          <div className="text-sm text-gray-500">Sıra: {workOrder.sequence}</div>
        </div>
      ),
    },
    {
      key: 'productionOrder',
      header: 'Üretim Emri',
      render: (workOrder: MrpWorkOrder) => (
        <div>
          <div className="font-medium text-gray-900">
            {workOrder.productionOrder?.orderNumber || 'N/A'}
          </div>
        </div>
      ),
    },
    {
      key: 'material',
      header: 'Malzeme',
      render: (workOrder: MrpWorkOrder) => (
        <div>
          <div className="text-gray-900">
            {workOrder.material?.code}
            {' - '}
            {workOrder.material?.name || workOrder.materialId}
          </div>
        </div>
      ),
    },
    {
      key: 'workCenter',
      header: 'İş Merkezi',
      render: (workOrder: MrpWorkOrder) => (
        <div>
          <div className="font-medium text-gray-900">
            {workOrder.workCenter?.name || workOrder.workCenterId}
          </div>
          <div className="flex items-center gap-2">
            <span>{workOrder.operation?.name || workOrder.operationId}</span>
          </div>
          <div className="text-sm text-gray-500">{workOrder.assignedOperators.length} Operatör</div>
        </div>
      ),
    },
    {
      key: 'quantities',
      header: 'Miktarlar',
      render: (workOrder: MrpWorkOrder) => (
        <div className="text-sm">
          <div>Plan: {workOrder.plannedQuantity}</div>
          <div>Tamamlanan: {workOrder.confirmedQuantity}</div>
          {workOrder.scrapQuantity > 0 && (
            <div className="text-red-600">Fire: {workOrder.scrapQuantity}</div>
          )}
        </div>
      ),
    },
    {
      key: 'schedule',
      header: 'Planlama',
      render: (workOrder: MrpWorkOrder) => (
        <div className="text-sm">
          <div className="flex items-center gap-1">
            <FaClock className="w-3 h-3 text-gray-400" />
            <span>
              Başlangıç: {new Date(workOrder.plannedStartDate).toLocaleDateString('tr-TR')}
            </span>
          </div>
          <div className="flex items-center gap-1">
            <FaClock className="w-3 h-3 text-gray-400" />
            <span>Bitiş: {new Date(workOrder.plannedEndDate).toLocaleDateString('tr-TR')}</span>
          </div>
        </div>
      ),
    },
    {
      key: 'priority',
      header: 'Öncelik',
      render: (workOrder: MrpWorkOrder) =>
        workOrder.productionOrder?.priority ? (
          <span
            className={`px-2 py-1 text-xs font-medium rounded-full ${getPriorityColor(
              workOrder.productionOrder.priority,
            )}`}
          >
            {getPriorityText(workOrder.productionOrder.priority)}
          </span>
        ) : (
          '-'
        ),
    },
    {
      key: 'status',
      header: 'Durum',
      render: (workOrder: MrpWorkOrder) => (
        <span
          className={`px-2 py-1 text-xs font-medium rounded-full ${getWorkOrderStatusColor(
            workOrder.status,
          )}`}
        >
          {getWorkOrderStatusText(workOrder.status)}
        </span>
      ),
    },
    {
      key: 'actions',
      header: 'İşlemler',
      render: (workOrder: MrpWorkOrder) => (
        <div className="flex gap-1">
          {workOrder.status === WorkOrderStatusEnum.Released && (
            <button
              onClick={() => handleStart(workOrder)}
              className="p-1 text-green-600 hover:bg-green-50 rounded"
              title="Başlat"
            >
              <FaPlay className="w-4 h-4" />
            </button>
          )}
          {workOrder.status === WorkOrderStatusEnum.InProgress && (
            <button
              onClick={() => handleComplete(workOrder)}
              className="p-1 text-blue-600 hover:bg-blue-50 rounded"
              title="Tamamla"
            >
              <FaCheckCircle className="w-4 h-4" />
            </button>
          )}
          <button
            onClick={() => handleViewDetails(workOrder)}
            className="p-1 text-purple-600 hover:bg-purple-50 rounded"
            title="Detayları Görüntüle"
          >
            <FaCog className="w-4 h-4" />
          </button>
          <button
            onClick={() => handleEdit(workOrder)}
            className="p-1 text-blue-600 hover:bg-blue-50 rounded"
            title="Düzenle"
          >
            <FaEdit className="w-4 h-4" />
          </button>
          <button
            onClick={() => handleDelete(workOrder.id)}
            className="p-1 text-red-600 hover:bg-red-50 rounded"
            title="Sil"
          >
            <FaTrash className="w-4 h-4" />
          </button>
        </div>
      ),
    },
  ]

  // Calculate statistics
  const totalWorkOrders = workOrders.length
  const inProgressOrders = workOrders.filter(
    (wo) => wo.status === WorkOrderStatusEnum.InProgress,
  ).length
  const completedOrders = workOrders.filter(
    (wo) => wo.status === WorkOrderStatusEnum.Completed,
  ).length
  const delayedOrders = workOrders.filter(
    (wo) => wo.status !== WorkOrderStatusEnum.Completed && new Date(wo.plannedEndDate) < new Date(),
  ).length

  // Status distribution
  const statusDistribution = Object.values(WorkOrderStatusEnum).map((status) => ({
    status,
    count: workOrders.filter((wo) => wo.status === status).length,
    percentage:
      (workOrders.filter((wo) => wo.status === status).length / workOrders.length) * 100 || 0,
  }))

  return (
    <Container>
      <div className="space-y-2">
        {/* Header */}
        <div className="flex items-center justify-between">
          <div>
            <h2 className="text-2xl font-bold text-gray-900">İş Emirleri</h2>
            <p className="text-gray-600">Üretim operasyonlarının detaylı takibi</p>
          </div>
          <button
            onClick={handleAdd}
            className="flex items-center gap-2 px-3 py-1.5 bg-blue-600 text-white rounded-md hover:bg-blue-700 transition-colors text-sm"
          >
            <FaPlus className="w-4 h-4" />
            Yeni İş Emri
          </button>
        </div>

        {/* Stats Cards */}
        <div className="grid grid-cols-1 md:grid-cols-4 gap-3">
          <Widget title="Toplam İş Emri" value={totalWorkOrders} color="blue" icon="FaCog" />

          <Widget title="İşlemde" value={inProgressOrders} color="yellow" icon="FaPlay" />

          <Widget title="Tamamlanan" value={completedOrders} color="green" icon="FaCheckCircle" />

          <Widget title="Geciken" value={delayedOrders} color="red" icon="FaExclamationCircle" />
        </div>

        {/* Status Distribution */}
        <div className="bg-white rounded-lg shadow-sm border p-3">
          <h3 className="text-sm font-semibold text-gray-900 mb-2">Durum Dağılımı</h3>
          <div className="grid grid-cols-2 md:grid-cols-5 gap-2">
            {statusDistribution.map(({ status, count, percentage }) => (
              <div key={status} className="text-center p-2 border rounded-lg">
                <div
                  className={`inline-block px-1.5 py-0.5 text-xs font-medium rounded-full mb-1 ${getWorkOrderStatusColor(
                    status,
                  )}`}
                >
                  {getWorkOrderStatusText(status)}
                </div>
                <div className="text-xl font-bold text-gray-900">{count}</div>
                <div className="text-xs text-gray-500">{percentage.toFixed(1)}%</div>
              </div>
            ))}
          </div>
        </div>

        {/* Filters */}
        <div className="flex gap-2 items-center">
          <div className="flex-1">
            <input
              type="text"
              placeholder="İş emri numarası ara..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              className="w-full px-2 py-1 text-sm border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
            />
          </div>

          <select
            value={selectedStatus}
            onChange={(e) => setSelectedStatus(e.target.value as WorkOrderStatusEnum | 'all')}
            className="px-2 py-1.5 text-sm border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
          >
            <option value="all">Tüm Durumlar</option>
            {Object.values(WorkOrderStatusEnum).map((status) => (
              <option key={status} value={status}>
                {getWorkOrderStatusText(status)}
              </option>
            ))}
          </select>

          <select
            value={selectedPriority}
            onChange={(e) => setSelectedPriority(e.target.value as PriorityEnum | 'all')}
            className="px-2 py-1.5 text-sm border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
          >
            <option value="all">Tüm Öncelikler</option>
            {Object.values(PriorityEnum).map((priority) => (
              <option key={priority} value={priority}>
                {getPriorityText(priority)}
              </option>
            ))}
          </select>
        </div>

        {/* Data Table */}
        <div className="bg-white rounded-lg shadow-sm border">
          <DataTable data={filteredWorkOrders} columns={columns} />
        </div>

        {filteredWorkOrders.length === 0 && (
          <div className="text-center py-12">
            <FaCog className="w-12 h-12 text-gray-400 mx-auto mb-4" />
            <h3 className="text-lg font-medium text-gray-900 mb-2">İş emri bulunamadı</h3>
            <p className="text-gray-500">Arama kriterlerinizi değiştirmeyi deneyin.</p>
          </div>
        )}
      </div>

      {/* Modals */}
      <NewWorkOrderForm
        isOpen={isNewWorkOrderOpen}
        onClose={() => setIsNewWorkOrderOpen(false)}
        onSave={handleNewWorkOrderSave}
      />

      <EditWorkOrderForm
        isOpen={isEditWorkOrderOpen}
        onClose={() => setIsEditWorkOrderOpen(false)}
        onSave={handleEditWorkOrderSave}
        workOrder={selectedWorkOrder}
      />

      <ViewWorkOrderModal
        isOpen={isViewWorkOrderOpen}
        onClose={() => setIsViewWorkOrderOpen(false)}
        workOrder={selectedWorkOrder}
      />

      <CompleteWorkOrderModal
        isOpen={isCompleteWorkOrderOpen}
        onClose={() => setIsCompleteWorkOrderOpen(false)}
        onConfirm={handleCompleteWorkOrder}
        workOrder={selectedWorkOrder}
      />
    </Container>
  )
}

export default WorkOrders