import React, { useState } from 'react'
import {
  FaPlus,
  FaEdit,
  FaTrash,
  FaBuilding,
  FaUsers,
  FaDollarSign,
  FaEye,
  FaList,
  FaTh,
} from 'react-icons/fa'
import { HrDepartment } from '../../../types/hr'
import DataTable, { Column } from '../../../components/common/DataTable'
import { mockDepartments } from '../../../mocks/mockDepartments'
import { mockEmployees } from '../../../mocks/mockEmployees'
import { mockCostCenters } from '../../../mocks/mockCostCenters'
import DepartmentFormModal from './DepartmentFormModal'
import DepartmentViewModal from './DepartmentViewModal'
import Widget from '../../../components/common/Widget'
import { Container } from '@/components/shared'

const DepartmentManagement: React.FC = () => {
  const [departments, setDepartments] = useState<HrDepartment[]>(mockDepartments)
  const [searchTerm, setSearchTerm] = useState('')
  const [selectedParent, setSelectedParent] = useState<string>('all')
  const [viewMode, setViewMode] = useState<'list' | 'cards'>('list')

  // Modal states
  const [isFormModalOpen, setIsFormModalOpen] = useState(false)
  const [isViewModalOpen, setIsViewModalOpen] = useState(false)
  const [selectedDepartment, setSelectedDepartment] = useState<HrDepartment | undefined>()
  const [modalTitle, setModalTitle] = useState('')

  const handleAdd = () => {
    setSelectedDepartment(undefined)
    setModalTitle('Yeni Departman')
    setIsFormModalOpen(true)
  }

  const handleEdit = (department: HrDepartment) => {
    setSelectedDepartment(department)
    setModalTitle('Departman Düzenle')
    setIsFormModalOpen(true)
  }

  const handleView = (department: HrDepartment) => {
    setSelectedDepartment(department)
    setIsViewModalOpen(true)
  }

  const handleDelete = (id: string) => {
    if (confirm('Bu departmanı silmek istediğinizden emin misiniz?')) {
      setDepartments((prev) => prev.filter((dept) => dept.id !== id))
    }
  }

  const handleSave = (departmentData: Partial<HrDepartment>) => {
    if (selectedDepartment) {
      // Edit existing department
      setDepartments((prev) =>
        prev.map((dept) =>
          dept.id === selectedDepartment.id
            ? { ...dept, ...departmentData, lastModificationTime: new Date() }
            : dept,
        ),
      )
    } else {
      // Add new department
      const newDepartment: HrDepartment = {
        id: `dept_${Date.now()}`,
        ...departmentData,
        subDepartments: [],
        creationTime: new Date(),
        lastModificationTime: new Date(),
      } as HrDepartment
      setDepartments((prev) => [...prev, newDepartment])
    }
    setIsFormModalOpen(false)
  }

  const handleCloseFormModal = () => {
    setIsFormModalOpen(false)
    setSelectedDepartment(undefined)
  }

  const handleCloseViewModal = () => {
    setIsViewModalOpen(false)
    setSelectedDepartment(undefined)
  }

  const handleEditFromView = (department: HrDepartment) => {
    setIsViewModalOpen(false)
    handleEdit(department)
  }

  mockDepartments.forEach((dept) => {
    if (dept.managerId) {
      dept.manager = mockEmployees.find((emp) => emp.id === dept.managerId)
    }
    if (dept.costCenterId) {
      dept.costCenter = mockCostCenters.find((cc) => cc.id === dept.costCenterId)
    }
  })

  const filteredDepartments = departments.filter((department) => {
    if (
      searchTerm &&
      !department.name.toLowerCase().includes(searchTerm.toLowerCase()) &&
      !department.code.toLowerCase().includes(searchTerm.toLowerCase())
    ) {
      return false
    }
    if (selectedParent !== 'all' && department.parentDepartmentId !== selectedParent) {
      return false
    }
    return true
  })

  const columns: Column<HrDepartment>[] = [
    {
      key: 'code',
      header: 'Departman Kodu',
      sortable: true,
    },
    {
      key: 'name',
      header: 'Departman Adı',
      sortable: true,
    },
    {
      key: 'parentDepartment',
      header: 'Üst Departman',
      render: (department: HrDepartment) => department.parentDepartment?.name || '-',
    },
    {
      key: 'manager',
      header: 'Yönetici',
      render: (department: HrDepartment) => department.manager?.fullName || '-',
    },
    {
      key: 'employeeCount',
      header: 'Personel Sayısı',
      render: (department: HrDepartment) => (
        <div className="flex items-center gap-1">
          <FaUsers className="w-4 h-4 text-gray-500" />
          <span>{mockEmployees.filter((a) => a.departmantId == department.id).length || 0}</span>
        </div>
      ),
    },
    {
      key: 'costCenter',
      header: 'Maliyet Merkezi',
      render: (department: HrDepartment) => (
        <div className="flex flex-col">
          <span className="font-medium">{department.costCenter?.code || '-'}</span>
          <span className="text-xs text-gray-500">{department.costCenter?.name || '-'}</span>
        </div>
      ),
    },
    {
      key: 'budget',
      header: 'Bütçe',
      render: (department: HrDepartment) => (
        <div className="flex items-center gap-1">
          <FaDollarSign className="w-4 h-4 text-gray-500" />
          <span>{department.budget ? `₺${department.budget.toLocaleString()}` : '-'}</span>
        </div>
      ),
    },
    {
      key: 'status',
      header: 'Durum',
      render: (department: HrDepartment) => (
        <span
          className={`px-2 py-1 text-xs font-medium rounded-full ${
            department.isActive ? 'bg-green-100 text-green-800' : 'bg-red-100 text-red-800'
          }`}
        >
          {department.isActive ? 'Aktif' : 'Pasif'}
        </span>
      ),
    },
    {
      key: 'actions',
      header: 'İşlemler',
      render: (department: HrDepartment) => (
        <div className="flex gap-2">
          <button
            onClick={() => handleView(department)}
            className="p-1 text-green-600 hover:bg-green-50 rounded"
            title="Görüntüle"
          >
            <FaEye className="w-4 h-4" />
          </button>
          <button
            onClick={() => handleEdit(department)}
            className="p-1 text-blue-600 hover:bg-blue-50 rounded"
            title="Düzenle"
          >
            <FaEdit className="w-4 h-4" />
          </button>
          <button
            onClick={() => handleDelete(department.id)}
            className="p-1 text-red-600 hover:bg-red-50 rounded"
            title="Sil"
          >
            <FaTrash className="w-4 h-4" />
          </button>
        </div>
      ),
    },
  ]

  return (
    <Container>
      <div className="space-y-2">
        {/* Header */}
        <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-3">
          <div>
            <h2 className="text-lg font-bold text-gray-900">Departman Yönetimi</h2>
            <p className="text-sm text-gray-600 mt-1">
              Organizasyon yapısını ve departmanları yönetin
            </p>
          </div>
          <div className="flex items-center gap-3">
            {/* View Mode Toggle */}
            <div className="flex bg-gray-100 rounded-lg p-0.5">
              <button
                onClick={() => setViewMode('list')}
                className={`p-1.5 rounded-md transition-colors ${
                  viewMode === 'list'
                    ? 'bg-white text-blue-600 shadow-sm'
                    : 'text-gray-600 hover:text-gray-900'
                }`}
                title="Liste Görünümü"
              >
                <FaList className="w-4 h-4" />
              </button>
              <button
                onClick={() => setViewMode('cards')}
                className={`p-1.5 rounded-md transition-colors ${
                  viewMode === 'cards'
                    ? 'bg-white text-blue-600 shadow-sm'
                    : 'text-gray-600 hover:text-gray-900'
                }`}
                title="Kart Görünümü"
              >
                <FaTh className="w-4 h-4" />
              </button>
            </div>
            <button
              onClick={handleAdd}
              className="flex items-center gap-2 px-3 py-1.5 text-sm bg-blue-600 text-white rounded-md hover:bg-blue-700 transition-colors"
            >
              <FaPlus className="w-4 h-4" />
              Yeni Departman
            </button>
          </div>
        </div>

        {/* Stats Cards */}
        <div className="grid grid-cols-1 md:grid-cols-4 gap-3">
          <Widget
            title="Toplam Departman"
            value={departments.length}
            color="blue"
            icon="FaBuilding"
          />

          <Widget
            title="Toplam Personel"
            value={mockEmployees.length}
            color="green"
            icon="FaUsers"
          />

          <Widget
            title="Ana Departmanlar"
            value={departments.filter((d) => !d.parentDepartmentId).length}
            color="purple"
            icon="FaBuilding"
          />

          <Widget
            title="Toplam Bütçe"
            value={`₺${departments
              .reduce((total, dept) => total + (dept.budget || 0), 0)
              .toLocaleString()}`}
            color="orange"
            icon="FaDollarSign"
          />
        </div>

        {/* Filters */}
        <div className="flex flex-col sm:flex-row gap-3 items-stretch sm:items-center">
          <div className="flex-1">
            <input
              type="text"
              placeholder="Departman adı veya kodu ara..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              className="w-full px-3 py-1.5 text-sm border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500"
            />
          </div>

          <select
            value={selectedParent}
            onChange={(e) => setSelectedParent(e.target.value)}
            className="px-3 py-1 text-sm border border-gray-300 rounded-md focus:outline-none focus:ring-2 focus:ring-blue-500 min-w-0 sm:min-w-[200px]"
          >
            <option value="all">Tüm Departmanlar</option>
            {departments
              .filter((d) => !d.parentDepartmentId)
              .map((dept) => (
                <option key={dept.id} value={dept.id}>
                  {dept.name} Alt Departmanları
                </option>
              ))}
          </select>
        </div>

        {/* Data Display */}
        {viewMode === 'list' ? (
          <div className="bg-white rounded-lg shadow-sm border overflow-x-auto">
            <DataTable data={filteredDepartments} columns={columns} />
          </div>
        ) : (
          <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 xl:grid-cols-4 gap-3">
            {filteredDepartments.map((department) => (
              <div
                key={department.id}
                className="bg-white rounded-lg shadow-sm border hover:shadow-md transition-shadow p-3"
              >
                {/* Card Header */}
                <div className="flex items-start justify-between mb-4">
                  <div className="flex items-center space-x-3">
                    <div
                      className={`w-12 h-12 rounded-lg flex items-center justify-center ${
                        department.isActive
                          ? 'bg-blue-100 text-blue-600'
                          : 'bg-gray-100 text-gray-500'
                      }`}
                    >
                      <FaBuilding className="w-6 h-6" />
                    </div>
                    <div>
                      <h3 className="font-semibold text-sm text-gray-900 truncate">
                        {department.name}
                      </h3>
                      <p className="text-sm text-gray-600">{department.code}</p>
                    </div>
                  </div>
                  <span
                    className={`px-2 py-1 text-xs font-medium rounded-full ${
                      department.isActive
                        ? 'bg-green-100 text-green-800'
                        : 'bg-red-100 text-red-800'
                    }`}
                  >
                    {department.isActive ? 'Aktif' : 'Pasif'}
                  </span>
                </div>

                {/* Card Content */}
                <div className="space-y-2">
                  {department.parentDepartment && (
                    <div className="flex items-center text-xs text-gray-600">
                      <FaBuilding className="w-4 h-4 mr-2 text-gray-400" />
                      <span>Üst: {department.parentDepartment.name}</span>
                    </div>
                  )}

                  {department.manager && (
                    <div className="flex items-center text-xs text-gray-600">
                      <FaUsers className="w-4 h-4 mr-2 text-gray-400" />
                      <span>Yönetici: {department.manager.fullName}</span>
                    </div>
                  )}

                  <div className="flex items-center text-xs text-gray-600">
                    <FaUsers className="w-4 h-4 mr-2 text-gray-400" />
                    <span>
                      {mockEmployees.filter((emp) => emp.departmantId === department.id).length}{' '}
                      Personel
                    </span>
                  </div>

                  {department.budget && (
                    <div className="flex items-center text-xs text-gray-600">
                      <FaDollarSign className="w-4 h-4 mr-2 text-gray-400" />
                      <span>₺{department.budget.toLocaleString()}</span>
                    </div>
                  )}

                  {department.costCenter && (
                    <div className="text-xs text-gray-600">
                      <div className="font-medium">{department.costCenter.code}</div>
                      <div className="text-xs text-gray-500">{department.costCenter.name}</div>
                    </div>
                  )}
                </div>

                {/* Card Actions */}
                <div className="flex justify-end space-x-1 mt-3 pt-3 border-t border-gray-100">
                  <button
                    onClick={() => handleView(department)}
                    className="p-1.5 text-green-600 hover:bg-green-50 rounded-lg transition-colors"
                    title="Görüntüle"
                  >
                    <FaEye className="w-4 h-4" />
                  </button>
                  <button
                    onClick={() => handleEdit(department)}
                    className="p-1.5 text-blue-600 hover:bg-blue-50 rounded-lg transition-colors"
                    title="Düzenle"
                  >
                    <FaEdit className="w-4 h-4" />
                  </button>
                  <button
                    onClick={() => handleDelete(department.id)}
                    className="p-1.5 text-red-600 hover:bg-red-50 rounded-lg transition-colors"
                    title="Sil"
                  >
                    <FaTrash className="w-4 h-4" />
                  </button>
                </div>
              </div>
            ))}
          </div>
        )}

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

      {/* Modals */}
      <DepartmentFormModal
        isOpen={isFormModalOpen}
        onClose={handleCloseFormModal}
        onSave={handleSave}
        department={selectedDepartment}
        title={modalTitle}
      />

      <DepartmentViewModal
        isOpen={isViewModalOpen}
        onClose={handleCloseViewModal}
        department={selectedDepartment || null}
        onEdit={handleEditFromView}
      />
    </Container>
  )
}

export default DepartmentManagement