import React, { useState } from 'react'
import {
  FaBullseye,
  FaPlus,
  FaEdit,
  FaTrash,
  FaDollarSign,
  FaCalendar,
  FaArrowUp,
  FaUser,
  FaBuilding,
} from 'react-icons/fa'
import { CrmOpportunity, OpportunityStageEnum } from '../../../types/crm'
import DataTable, { Column } from '../../../components/common/DataTable'
import { mockBusinessParties } from '../../../mocks/mockBusinessParties'
import { mockOpportunities } from '../../../mocks/mockOpportunities'
import OpportunityForm from './OpportunityForm'
import OpportunityDetails from './OpportunityDetails'
import { BusinessParty } from '../../../types/common'
import Widget from '../../../components/common/Widget'
import {
  getOpportunityProbabilityColor,
  getOpportunityStageColor,
  getOpportunityStageText,
} from '../../../utils/erp'
import { Container } from '@/components/shared'

const OpportunityManagement: React.FC = () => {
  const [opportunities, setOpportunities] = useState<CrmOpportunity[]>(mockOpportunities)
  const [customers] = useState<BusinessParty[]>(mockBusinessParties)
  const [searchTerm, setSearchTerm] = useState('')
  const [selectedStage, setSelectedStage] = useState<OpportunityStageEnum | 'all'>('all')
  const [selectedCustomer, setSelectedCustomer] = useState<string>('all')

  // Modal states
  const [isFormOpen, setIsFormOpen] = useState(false)
  const [isDetailsOpen, setIsDetailsOpen] = useState(false)
  const [selectedOpportunity, setSelectedOpportunity] = useState<CrmOpportunity | null>(null)
  const [formMode, setFormMode] = useState<'create' | 'edit'>('create')

  const handleAdd = () => {
    setSelectedOpportunity(null)
    setFormMode('create')
    setIsFormOpen(true)
  }

  const handleEdit = (opportunity: CrmOpportunity) => {
    setSelectedOpportunity(opportunity)
    setFormMode('edit')
    setIsFormOpen(true)
  }

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

  const handleViewDetails = (opportunity: CrmOpportunity) => {
    setSelectedOpportunity(opportunity)
    setIsDetailsOpen(true)
  }

  const handleSaveOpportunity = (opportunity: CrmOpportunity) => {
    if (formMode === 'create') {
      setOpportunities((prev) => [...prev, opportunity])
    } else {
      setOpportunities((prev) => prev.map((opp) => (opp.id === opportunity.id ? opportunity : opp)))
    }
  }

  const handleCloseForm = () => {
    setIsFormOpen(false)
    setSelectedOpportunity(null)
  }

  const handleCloseDetails = () => {
    setIsDetailsOpen(false)
    setSelectedOpportunity(null)
  }

  const handleEditFromDetails = (opportunity: CrmOpportunity) => {
    setIsDetailsOpen(false)
    handleEdit(opportunity)
  }

  const filteredOpportunities = opportunities.filter((opportunity) => {
    if (
      searchTerm &&
      !opportunity.title.toLowerCase().includes(searchTerm.toLowerCase()) &&
      !opportunity.description?.toLowerCase().includes(searchTerm.toLowerCase())
    ) {
      return false
    }
    if (selectedStage !== 'all' && opportunity.stage !== selectedStage) {
      return false
    }
    if (selectedCustomer !== 'all' && opportunity.customerId !== selectedCustomer) {
      return false
    }
    return true
  })

  const columns: Column<CrmOpportunity>[] = [
    {
      key: 'title',
      header: 'Fırsat Başlığı',
      sortable: true,
      render: (opportunity: CrmOpportunity) => (
        <div>
          <div className="font-medium text-gray-900">{opportunity.title}</div>
          <div className="text-sm text-gray-500">{opportunity.opportunityNumber}</div>
        </div>
      ),
    },
    {
      key: 'customer',
      header: 'Müşteri',
      render: (opportunity: CrmOpportunity) => {
        const customer = customers.find((c) => c.id === opportunity.customerId)
        return customer ? (
          <div className="flex items-center gap-2">
            <FaBuilding className="w-4 h-4 text-gray-400" />
            <span>{customer.name}</span>
          </div>
        ) : (
          '-'
        )
      },
    },
    {
      key: 'stage',
      header: 'Aşama',
      render: (opportunity: CrmOpportunity) => (
        <span
          className={`px-2 py-1 text-xs font-medium rounded-full ${getOpportunityStageColor(
            opportunity.stage,
          )}`}
        >
          {getOpportunityStageText(opportunity.stage)}
        </span>
      ),
    },
    {
      key: 'estimatedValue',
      header: 'Tahmini Değer',
      render: (opportunity: CrmOpportunity) => (
        <div className="flex items-center gap-1">
          <FaDollarSign className="w-4 h-4 text-gray-400" />
          <span className="font-medium">₺{opportunity.estimatedValue.toLocaleString()}</span>
        </div>
      ),
    },
    {
      key: 'probability',
      header: 'Olasılık',
      render: (opportunity: CrmOpportunity) => (
        <div className="flex items-center gap-1">
          <FaArrowUp className="w-4 h-4 text-gray-400" />
          <span
            className={`font-medium ${getOpportunityProbabilityColor(opportunity.probability)}`}
          >
            %{opportunity.probability}
          </span>
        </div>
      ),
    },
    {
      key: 'expectedCloseDate',
      header: 'Beklenen Kapanış',
      render: (opportunity: CrmOpportunity) => (
        <div className="flex items-center gap-1 text-sm">
          <FaCalendar className="w-3 h-3 text-gray-400" />
          <span>{new Date(opportunity.expectedCloseDate).toLocaleDateString('tr-TR')}</span>
        </div>
      ),
    },
    {
      key: 'assignedTo',
      header: 'Sorumlu',
      render: (opportunity: CrmOpportunity) => (
        <div className="flex items-center gap-1">
          <FaUser className="w-4 h-4 text-gray-400" />
          <span>{opportunity.assigned?.fullName}</span>
        </div>
      ),
    },
    {
      key: 'actions',
      header: 'İşlemler',
      render: (opportunity: CrmOpportunity) => (
        <div className="flex gap-2">
          <button
            onClick={() => handleViewDetails(opportunity)}
            className="p-1 text-blue-600 hover:bg-blue-50 rounded"
            title="Detayları Görüntüle"
          >
            <FaBullseye className="w-4 h-4" />
          </button>
          <button
            onClick={() => handleEdit(opportunity)}
            className="p-1 text-green-600 hover:bg-green-50 rounded"
            title="Düzenle"
          >
            <FaEdit className="w-4 h-4" />
          </button>
          <button
            onClick={() => handleDelete(opportunity.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 totalOpportunities = opportunities.length
  const activeOpportunities = opportunities.filter(
    (o) =>
      o.stage !== OpportunityStageEnum.ClosedWon && o.stage !== OpportunityStageEnum.ClosedLost,
  ).length
  const totalValue = opportunities.reduce((sum, opp) => sum + opp.estimatedValue, 0)
  const averageProbability =
    opportunities.reduce((sum, opp) => sum + opp.probability, 0) / opportunities.length || 0

  // Stage distribution
  const stageDistribution = Object.values(OpportunityStageEnum).map((stage) => ({
    stage,
    count: opportunities.filter((o) => o.stage === stage).length,
    value: opportunities
      .filter((o) => o.stage === stage)
      .reduce((sum, o) => sum + o.estimatedValue, 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">Teklif & Fırsat Yönetimi</h2>
            <p className="text-gray-600">Satış fırsatları ve teklif takibi</p>
          </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 Fırsat
          </button>
        </div>

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

          <Widget title="Aktif Fırsat" value={activeOpportunities} color="green" icon="FaArrowUp" />

          <Widget
            title="Toplam Değer"
            value={`₺${totalValue.toLocaleString()}`}
            color="purple"
            icon="FaDollarSign"
          />

          <Widget
            title="Ortalama Olasılık"
            value={`%${averageProbability.toFixed(0)}`}
            color="orange"
            icon="FaArrowUp"
          />
        </div>

        {/* Stage Pipeline */}
        <div className="bg-white rounded-lg shadow-sm border p-3">
          <h3 className="text-sm font-semibold text-gray-900 mb-3">Satış Aşamaları</h3>
          <div className="grid grid-cols-2 md:grid-cols-6 gap-2">
            {stageDistribution.map(({ stage, count, value }) => (
              <div key={stage} className="text-center p-2 border rounded-lg">
                <div
                  className={`inline-block px-2 py-0.5 text-xs font-medium rounded-full mb-1 ${getOpportunityStageColor(
                    stage,
                  )}`}
                >
                  {getOpportunityStageText(stage)}
                </div>
                <div className="text-lg font-bold text-gray-900 mb-1">{count}</div>
                <div className="text-xs text-gray-500">₺{value.toLocaleString()}</div>
              </div>
            ))}
          </div>
        </div>

        {/* Win Rate Analysis */}
        <div className="bg-white rounded-lg shadow-sm border p-3">
          <h3 className="text-sm font-semibold text-gray-900 mb-3">Başarı Oranı Analizi</h3>
          <div className="grid grid-cols-1 md:grid-cols-3 gap-4">
            <div className="text-center">
              <div className="text-2xl font-bold text-green-600 mb-1">
                {opportunities.filter((o) => o.stage === OpportunityStageEnum.ClosedWon).length}
              </div>
              <p className="text-sm text-gray-600">Kazanılan Fırsat</p>
            </div>

            <div className="text-center">
              <div className="text-2xl font-bold text-red-600 mb-1">
                {opportunities.filter((o) => o.stage === OpportunityStageEnum.ClosedLost).length}
              </div>
              <p className="text-sm text-gray-600">Kaybedilen Fırsat</p>
            </div>

            <div className="text-center">
              <div className="text-2xl font-bold text-blue-600 mb-1">
                {Math.round(
                  (opportunities.filter((o) => o.stage === OpportunityStageEnum.ClosedWon).length /
                    Math.max(
                      opportunities.filter(
                        (o) =>
                          o.stage === OpportunityStageEnum.ClosedWon ||
                          o.stage === OpportunityStageEnum.ClosedLost,
                      ).length,
                      1,
                    )) *
                    100,
                )}
                %
              </div>
              <p className="text-sm text-gray-600">Kazanma Oranı</p>
            </div>
          </div>
        </div>

        {/* Filters */}
        <div className="flex gap-3 items-center">
          <div className="flex-1">
            <input
              type="text"
              placeholder="Fırsat başlığı 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={selectedStage}
            onChange={(e) => setSelectedStage(e.target.value as OpportunityStageEnum | 'all')}
            className="px-3 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 Aşamalar</option>
            {Object.values(OpportunityStageEnum).map((stage) => (
              <option key={stage} value={stage}>
                {getOpportunityStageText(stage)}
              </option>
            ))}
          </select>

          <select
            value={selectedCustomer}
            onChange={(e) => setSelectedCustomer(e.target.value)}
            className="px-3 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 Müşteriler</option>
            {customers.map((customer) => (
              <option key={customer.id} value={customer.id}>
                {customer.name}
              </option>
            ))}
          </select>
        </div>

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

        {filteredOpportunities.length === 0 && (
          <div className="text-center py-12">
            <FaBullseye className="w-10 h-10 text-gray-400 mx-auto mb-3" />
            <h3 className="text-sm font-medium text-gray-900 mb-2">Fırsat bulunamadı</h3>
            <p className="text-gray-500">Arama kriterlerinizi değiştirmeyi deneyin.</p>
          </div>
        )}
      </div>

      {/* Modals */}
      <OpportunityForm
        isOpen={isFormOpen}
        onClose={handleCloseForm}
        onSave={handleSaveOpportunity}
        opportunity={selectedOpportunity}
        mode={formMode}
      />

      <OpportunityDetails
        isOpen={isDetailsOpen}
        onClose={handleCloseDetails}
        onEdit={handleEditFromDetails}
        opportunity={selectedOpportunity}
      />
    </Container>
  )
}

export default OpportunityManagement