import { useState } from 'react'
import { toast } from 'sonner'
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
import { useConfirm } from '../../hooks/useConfirm'
import { Plus, Settings as SettingsIcon, X, Shield, UserPlus } from 'lucide-react'
import { commercialInsuranceApi, employeeApi } from '../../lib/api-services'
import Card from '../../components/ui/Card'
import Button from '../../components/ui/Button'
import { Input, Label } from '../../components/ui/Input'
import { InlineAlert } from '../../components/ui/InlineAlert'
import Modal from '../../components/ui/Modal'

const fmt = (n: number) => (n || 0).toLocaleString('zh-CN', { minimumFractionDigits: 2, maximumFractionDigits: 2 })

const INSURANCE_TYPES: Record<string, { label: string; color: string }> = {
  ACCIDENT: { label: '意外伤害险', color: 'bg-orange-50 text-orange-700 border border-orange-200' },
  SUPPLEMENTARY_MEDICAL: { label: '补充医疗保险', color: 'bg-blue-50 text-blue-700 border border-blue-200' },
  EMPLOYER_LIABILITY: { label: '雇主责任险', color: 'bg-purple-50 text-purple-700 border border-purple-200' },
  CRITICAL_ILLNESS: { label: '重大疾病险', color: 'bg-rose-50 text-rose-700 border border-rose-200' },
  GROUP_LIFE: { label: '团体寿险', color: 'bg-teal-50 text-teal-700 border border-teal-200' },
  OTHER: { label: '其他', color: 'bg-gray-50 text-gray-700 border border-gray-200' },
}

const DEFAULT_PLAN = {
  name: '', type: 'ACCIDENT', provider: '', policyNo: '', premium: 0, coverageAmount: 0,
  effectiveFrom: new Date().toISOString().slice(0, 10), effectiveTo: '', description: '',
}

/**
 * 商险管理 Tab — 管理商业保险（意外险、补充医疗、雇主责任险等）
 * 支持查看商险方案、参保人员、保单信息
 */
export default function CommercialInsuranceTab() {
  const queryClient = useQueryClient()
  const confirm = useConfirm()
  const [showAddPlan, setShowAddPlan] = useState(false)
  const [editingPlan, setEditingPlan] = useState<any>(null)
  const [selectedPlanId, setSelectedPlanId] = useState<string | null>(null)
  const [newPlan, setNewPlan] = useState<any>({ ...DEFAULT_PLAN })
  const [showEnrollModal, setShowEnrollModal] = useState(false)
  const [enrollEmployeeIds, setEnrollEmployeeIds] = useState<string[]>([])
  const [enrollEffectiveFrom, setEnrollEffectiveFrom] = useState(new Date().toISOString().slice(0, 10))

  const { data: plans = [], isLoading } = useQuery<any[]>({
    queryKey: ['commercial-insurance-plans'],
    queryFn: async () => {
      return await commercialInsuranceApi.plans()
    },
  })

  const { data: enrollments = [], isLoading: enrollLoading } = useQuery<any[]>({
    queryKey: ['commercial-insurance-enrollments', selectedPlanId],
    queryFn: async () => {
      if (!selectedPlanId) return []
      return await commercialInsuranceApi.enrollments(selectedPlanId)
    },
    enabled: !!selectedPlanId,
  })

  const savePlanMutation = useMutation({
    mutationFn: async (data: any) => {
      if (editingPlan) {
        return commercialInsuranceApi.savePlan(data, editingPlan.id) as any
      }
      return commercialInsuranceApi.savePlan(data) as any
    },
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['commercial-insurance-plans'] })
      setShowAddPlan(false)
      setEditingPlan(null)
      setNewPlan({ ...DEFAULT_PLAN })
      toast.success(editingPlan ? '商险方案已更新' : '商险方案已创建')
    },
    onError: () => toast.error('保存失败'),
  })

  const deletePlanMutation = useMutation({
    mutationFn: (id: string) => commercialInsuranceApi.removePlan(id),
    onSuccess: () => {
      queryClient.invalidateQueries({ queryKey: ['commercial-insurance-plans'] })
      setSelectedPlanId(null)
      toast.success('商险方案已删除')
    },
  })

  const { data: rosterData } = useQuery<any[]>({
    queryKey: ['employees-for-commercial-insurance'],
    queryFn: async () => {
      return await employeeApi.allLite({ status: 'ACTIVE' })
    },
    enabled: showEnrollModal,
  })

  const enrollMutation = useMutation({
    mutationFn: async (data: { employeeIds: string[]; effectiveFrom?: string }) =>
      commercialInsuranceApi.enroll(selectedPlanId!, data) as any,
    onSuccess: (res: any) => {
      queryClient.invalidateQueries({ queryKey: ['commercial-insurance-enrollments'] })
      queryClient.invalidateQueries({ queryKey: ['commercial-insurance-employee-summary'] })
      setShowEnrollModal(false)
      setEnrollEmployeeIds([])
      toast.success(`已添加 ${res.data?.enrolled || 0} 名员工`)
    },
    onError: () => toast.error('参保失败'),
  })

  const handleEdit = (plan: any) => {
    setEditingPlan(plan)
    setNewPlan({ ...plan })
    setShowAddPlan(true)
  }

  const handleSave = () => {
    if (!newPlan.name?.trim()) { toast.error('请填写方案名称'); return }
    if (!newPlan.provider?.trim()) { toast.error('请填写保险公司'); return }
    savePlanMutation.mutate(newPlan)
  }

  if (isLoading) return <Card><div className="text-center py-8 text-gray-400">加载中...</div></Card>

  return (
    <div className="space-y-3">
      <div className="flex items-center justify-between">
        <div className="flex items-center gap-2">
          <Shield className="h-4 w-4 text-primary" />
          <h2 className="text-sm font-medium">商业保险管理</h2>
        </div>
        <Button size="sm" onClick={() => { setEditingPlan(null); setNewPlan({ ...DEFAULT_PLAN }); setShowAddPlan(true) }}>
          <Plus className="w-4 h-4 mr-1" />新增方案
        </Button>
      </div>

      <InlineAlert type="info">
        商业保险为社保之外的自愿性补充保障，包括意外伤害险、补充医疗、雇主责任险等。此处管理商险方案及参保人员。
      </InlineAlert>

      {plans.length === 0 ? (
        <Card><div className="text-center py-8 text-gray-400 text-sm">暂无商险方案，点击「新增方案」创建</div></Card>
      ) : (
        <div className="grid gap-3 md:grid-cols-2 lg:grid-cols-3">
          {plans.map((plan: any) => {
            const typeCfg = INSURANCE_TYPES[plan.type] || INSURANCE_TYPES.OTHER
            const isSelected = selectedPlanId === plan.id
            return (
              <Card
                key={plan.id}
                className={`cursor-pointer transition-all ${isSelected ? 'ring-2 ring-primary/20' : 'hover:shadow-md'}`}
              >
                <div onClick={() => setSelectedPlanId(isSelected ? null : plan.id)}>
                  <div className="flex items-start justify-between mb-2">
                    <div>
                      <span className={`px-2 py-0.5 rounded text-xs ${typeCfg.color}`}>{typeCfg.label}</span>
                      <h3 className="text-sm font-medium mt-1">{plan.name}</h3>
                    </div>
                    <div className="flex gap-1" onClick={(e) => e.stopPropagation()}>
                      <button className="text-xs text-gray-400 hover:text-primary" onClick={() => handleEdit(plan)}>
                        <SettingsIcon className="w-3.5 h-3.5" />
                      </button>
                      <button className="text-xs text-gray-400 hover:text-danger" onClick={async () => {
                        if (await confirm({ title: '确认删除', message: `确定删除商险方案「${plan.name}」吗？` })) {
                          deletePlanMutation.mutate(plan.id)
                        }
                      }}>
                        <X className="w-3.5 h-3.5" />
                      </button>
                    </div>
                  </div>
                  <div className="space-y-1 text-xs text-gray-500">
                    <div className="flex justify-between"><span>保险公司</span><span className="text-gray-700">{plan.provider}</span></div>
                    <div className="flex justify-between"><span>保单号</span><span className="text-gray-700 font-mono">{plan.policyNo || '—'}</span></div>
                    <div className="flex justify-between"><span>保费(年)</span><span className="text-gray-700">¥{fmt(plan.premium)}</span></div>
                    <div className="flex justify-between"><span>保额</span><span className="text-gray-700">¥{fmt(plan.coverageAmount)}</span></div>
                    <div className="flex justify-between"><span>保障期间</span><span className="text-gray-700">{plan.effectiveFrom} ~ {plan.effectiveTo || '长期'}</span></div>
                  </div>
                  {plan.description && <p className="text-xs text-gray-400 mt-2 line-clamp-2">{plan.description}</p>}
                </div>
              </Card>
            )
          })}
        </div>
      )}

      {selectedPlanId && (
        <Card>
          <div className="flex items-center justify-between mb-3">
            <h3 className="text-sm font-medium">参保人员（{enrollments.length}人）</h3>
            <Button size="sm" onClick={() => { setEnrollEmployeeIds([]); setEnrollEffectiveFrom(new Date().toISOString().slice(0, 10)); setShowEnrollModal(true) }}>
              <UserPlus className="w-4 h-4 mr-1" />为员工参保
            </Button>
          </div>
          {enrollLoading ? (
            <div className="text-center py-4 text-gray-400 text-sm">加载中...</div>
          ) : enrollments.length === 0 ? (
            <div className="text-center py-4 text-gray-400 text-sm">暂无参保人员</div>
          ) : (
            <div className="overflow-x-auto">
              <table className="w-full text-sm">
                <thead>
                  <tr className="border-b text-xs text-gray-500">
                    <th className="py-2 text-left">姓名</th>
                    <th className="py-2 text-left">部门</th>
                    <th className="py-2 text-left">身份证号</th>
                    <th className="py-2 text-right">保费</th>
                    <th className="py-2 text-left">生效日期</th>
                    <th className="py-2 text-left">状态</th>
                  </tr>
                </thead>
                <tbody>
                  {enrollments.map((e: any) => (
                    <tr key={e.id || e.employeeId} className="border-b last:border-0 hover:bg-gray-50">
                      <td className="py-2 font-medium">{e.name}</td>
                      <td className="py-2 text-gray-500">{e.department}</td>
                      <td className="py-2 text-gray-400 font-mono text-xs">{e.idCardMasked || '—'}</td>
                      <td className="py-2 text-right">¥{fmt(e.premium || 0)}</td>
                      <td className="py-2 text-gray-500 text-xs">{e.effectiveFrom || '—'}</td>
                      <td className="py-2">
                        <span className={`px-2 py-0.5 rounded text-xs ${e.status === 'ACTIVE' ? 'bg-green-50 text-safe' : 'bg-gray-100 text-gray-500'}`}>
                          {e.status === 'ACTIVE' ? '有效' : '已终止'}
                        </span>
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          )}
        </Card>
      )}

      {/* 批量参保 Modal */}
      {showEnrollModal && (
        <Modal open={true} onClose={() => setShowEnrollModal(false)} title="批量参保" size="lg">
          <div className="space-y-3">
            <InlineAlert type="info">
              选择需要参保的员工，设置生效日期后点击「确认参保」。
            </InlineAlert>
            <div className="flex items-center gap-2">
              <Label className="shrink-0">生效日期</Label>
              <Input type="date" value={enrollEffectiveFrom} onChange={(e) => setEnrollEffectiveFrom(e.target.value)} className="!w-40" />
            </div>
            <div className="max-h-80 overflow-y-auto border rounded-md">
              <table className="w-full text-sm">
                <thead className="sticky top-0 bg-white">
                  <tr className="border-b text-xs text-gray-500">
                    <th className="py-2 px-3 text-left w-8">
                      <input type="checkbox" checked={enrollEmployeeIds.length === (rosterData?.length || 0) && enrollEmployeeIds.length > 0}
                        onChange={(e) => {
                          if (e.target.checked) {
                            setEnrollEmployeeIds(rosterData?.map((emp: any) => emp.id) || [])
                          } else {
                            setEnrollEmployeeIds([])
                          }
                        }} />
                    </th>
                    <th className="py-2 px-3 text-left">姓名</th>
                    <th className="py-2 px-3 text-left">部门</th>
                    <th className="py-2 px-3 text-left">状态</th>
                  </tr>
                </thead>
                <tbody>
                  {rosterData?.map((emp: any) => (
                    <tr key={emp.id} className="border-b last:border-0 hover:bg-gray-50">
                      <td className="py-2 px-3">
                        <input type="checkbox" checked={enrollEmployeeIds.includes(emp.id)}
                          onChange={(e) => {
                            if (e.target.checked) setEnrollEmployeeIds([...enrollEmployeeIds, emp.id])
                            else setEnrollEmployeeIds(enrollEmployeeIds.filter((id) => id !== emp.id))
                          }} />
                      </td>
                      <td className="py-2 px-3 font-medium">{emp.name}</td>
                      <td className="py-2 px-3 text-gray-500">{emp.department}</td>
                      <td className="py-2 px-3">
                        <span className="px-2 py-0.5 rounded text-xs bg-green-50 text-safe">在职</span>
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
            <div className="flex items-center justify-between">
              <span className="text-xs text-gray-400">已选 {enrollEmployeeIds.length} 人</span>
              <div className="flex gap-2">
                <Button variant="secondary" size="sm" onClick={() => setShowEnrollModal(false)}>取消</Button>
                <Button size="sm" onClick={() => enrollMutation.mutate({ employeeIds: enrollEmployeeIds, effectiveFrom: enrollEffectiveFrom })}
                  disabled={enrollEmployeeIds.length === 0 || enrollMutation.isPending}>
                  {enrollMutation.isPending ? '参保中...' : '确认参保'}
                </Button>
              </div>
            </div>
          </div>
        </Modal>
      )}

      {showAddPlan && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/30" onClick={() => setShowAddPlan(false)}>
          <Card className="w-full max-w-lg mx-4" >
            <div onClick={(e) => e.stopPropagation()}>
              <div className="flex items-center justify-between mb-4">
                <h3 className="text-sm font-medium">{editingPlan ? '编辑商险方案' : '新增商险方案'}</h3>
                <button onClick={() => setShowAddPlan(false)} className="text-gray-400 hover:text-gray-600"><X className="w-4 h-4" /></button>
              </div>
              <div className="space-y-3">
                <div>
                  <Label>方案名称 *</Label>
                  <Input value={newPlan.name} onChange={(e) => setNewPlan({ ...newPlan, name: e.target.value })} placeholder="如：2024年度员工意外险" />
                </div>
                <div className="grid grid-cols-2 gap-3">
                  <div>
                    <Label>保险类型</Label>
                    <select
                      className="h-9 w-full rounded-md border border-gray-200 bg-white px-3 text-sm text-gray-700 shadow-sm outline-none transition focus:border-primary focus:ring-2 focus:ring-primary/10"
                      value={newPlan.type}
                      onChange={(e) => setNewPlan({ ...newPlan, type: e.target.value })}
                    >
                      {Object.entries(INSURANCE_TYPES).map(([k, v]) => <option key={k} value={k}>{v.label}</option>)}
                    </select>
                  </div>
                  <div>
                    <Label>保险公司 *</Label>
                    <Input value={newPlan.provider} onChange={(e) => setNewPlan({ ...newPlan, provider: e.target.value })} placeholder="如：中国人寿" />
                  </div>
                </div>
                <div className="grid grid-cols-2 gap-3">
                  <div>
                    <Label>保单号</Label>
                    <Input value={newPlan.policyNo} onChange={(e) => setNewPlan({ ...newPlan, policyNo: e.target.value })} placeholder="保单编号" />
                  </div>
                  <div>
                    <Label>保费（元/年）</Label>
                    <Input type="number" value={newPlan.premium} onChange={(e) => setNewPlan({ ...newPlan, premium: parseFloat(e.target.value) || 0 })} />
                  </div>
                </div>
                <div className="grid grid-cols-2 gap-3">
                  <div>
                    <Label>保额（元）</Label>
                    <Input type="number" value={newPlan.coverageAmount} onChange={(e) => setNewPlan({ ...newPlan, coverageAmount: parseFloat(e.target.value) || 0 })} />
                  </div>
                  <div>
                    <Label>到期日期</Label>
                    <Input type="date" value={newPlan.effectiveTo} onChange={(e) => setNewPlan({ ...newPlan, effectiveTo: e.target.value })} />
                  </div>
                </div>
                <div>
                  <Label>生效日期</Label>
                  <Input type="date" value={newPlan.effectiveFrom} onChange={(e) => setNewPlan({ ...newPlan, effectiveFrom: e.target.value })} />
                </div>
                <div>
                  <Label>备注</Label>
                  <Input value={newPlan.description} onChange={(e) => setNewPlan({ ...newPlan, description: e.target.value })} placeholder="保障范围、免赔额等" />
                </div>
                <div className="flex justify-end gap-2 pt-2">
                  <Button variant="secondary" size="sm" onClick={() => setShowAddPlan(false)}>取消</Button>
                  <Button size="sm" onClick={handleSave} disabled={savePlanMutation.isPending}>
                    {savePlanMutation.isPending ? '保存中...' : '保存'}
                  </Button>
                </div>
              </div>
            </div>
          </Card>
        </div>
      )}
    </div>
  )
}
