import { useState, useRef } from 'react'
import { usePageSize } from '../hooks/usePageSize'
import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query'
import { FileText, Copy, X, Download, BookOpen, HelpCircle, Plus, Edit, Trash2, Building2, Upload } from 'lucide-react'
import { toast } from 'sonner'
import { templatesApi } from '../lib/api-services'
import { useAuthStore } from '../store/authStore'
import Card from '../components/ui/Card'
import Button from '../components/ui/Button'
import { Input, Label, Select } from '../components/ui/Input'
import mammoth from 'mammoth'
import Modal from '../components/ui/Modal'
import EmptyState from '../components/ui/EmptyState'
import Pagination from '../components/ui/Pagination'
import { useConfirm } from '../hooks/useConfirm'
import PageGuide from '../components/ui/PageGuide'

const CATEGORY_LABELS: Record<string, string> = {
  CONTRACT: '合同',
  RULES: '规章制度',
  NOTICE: '通知',
  AGREEMENT: '协议',
  OTHER: '其他',
}

const VARIABLE_LABELS: Record<string, string> = {
  companyName: '公司名称',
  employeeName: '员工姓名',
  idCard: '证件号码',
  address: '地址',
  startDate: '开始日期',
  position: '岗位',
  endDate: '结束日期',
  terminationDate: '解除日期',
  publishDate: '公示日期',
  effectiveDate: '生效日期',
  meetingDate: '会议日期',
  meetingLocation: '会议地点',
  policyTitle: '制度名称',
  department: '部门',
  violationDate: '违纪日期',
  violationDescription: '违纪描述',
  probationEndDate: '试用期截止',
  regularDate: '转正日期',
  contractEndDate: '合同到期日',
  salary: '工资',
  phone: '手机号',
  hireDate: '入职日期',
  gender: '性别',
  birthDate: '出生日期',
  bankAccount: '银行账号',
  bankName: '开户银行',
  emergencyContact: '紧急联系人',
  emergencyPhone: '紧急联系电话',
  workYears: '工作年限',
  compAmount: '补偿金额',
  noticeDate: '通知日期',
  reason: '原因',
  overtimeHours: '加班时长',
  overtimePay: '加班费',
  socialInsBase: '社保基数',
  housingFundBase: '公积金基数',
  compensation: '经济补偿',
  lastWorkDay: '最后工作日',
  socialInsEndMonth: '社保截止月',
  housingFundEndMonth: '公积金截止月',
  probationMonths: '试用期月数',
  monthlySalary: '月薪',
  workplace: '工作地点',
  disciplineType: '处分类型',
  policyBasis: '制度依据',
}

/**
 * 用工文本模板库页面
 */
export default function Templates() {
  const [tab, setTab] = useState<'system' | 'enterprise'>('system')

  return (
    <div className="space-y-3">
      <PageGuide>模板管理，维护各类法律文书模板，包括劳动合同、离职证明、收入证明等。支持新增、编辑、预览模板，模板变量自动填充员工信息。关联：开具证明和签订合同时使用此处模板。</PageGuide>
      <div className="flex items-center gap-2">
        <FileText className="h-5 w-5 text-primary" />
        <h1 className="text-base font-semibold">用工文本模板库</h1>
      </div>

      {/* Tab 切换 */}
      <div className="flex gap-2">
        <button
          onClick={() => setTab('system')}
          className={`px-4 py-1.5 text-sm rounded-lg ${tab === 'system' ? 'bg-primary text-white' : 'bg-gray-100 text-gray-600 hover:bg-gray-200'}`}
        >
          系统模板库
        </button>
        <button
          onClick={() => setTab('enterprise')}
          className={`px-4 py-1.5 text-sm rounded-lg ${tab === 'enterprise' ? 'bg-primary text-white' : 'bg-gray-100 text-gray-600 hover:bg-gray-200'}`}
        >
          <Building2 className="w-3.5 h-3.5 inline mr-1" />企业文本库
        </button>
      </div>

      {tab === 'system' ? <SystemTemplates /> : <EnterpriseTemplates />}
    </div>
  )
}

function SystemTemplates() {
  const [category, setCategory] = useState<string>('')
  const [selected, setSelected] = useState<any>(null)
  const [rendered, setRendered] = useState<string>('')
  const [variables, setVariables] = useState<Record<string, string>>({})

  const { data: list, isLoading } = useQuery<any>({
    queryKey: ['templates', category],
    queryFn: async () => {
      return await templatesApi.list(category || undefined)
    },
  })

  const { data: detail } = useQuery<any>({
    queryKey: ['template-detail', selected?.id],
    queryFn: async () => {
      return await templatesApi.detail(selected.id)
    },
    enabled: !!selected,
  })

  const handleRender = async () => {
    if (!selected) return
    try {
      const res = await templatesApi.render(selected.id, variables) as any
      setRendered(res.content)
    } catch (err: any) {
      toast.error('渲染失败')
    }
  }

  const [showHelp, setShowHelp] = useState(false)

  const handleCopy = () => {
    navigator.clipboard.writeText(rendered)
    toast.success('已复制到剪贴板')
  }

  const handleDownloadWord = () => {
    if (!selected) return
    const token = useAuthStore.getState().accessToken
    const baseURL = import.meta.env.DEV ? 'http://localhost:3000/api/v1' : '/api/v1'
    const query = new URLSearchParams()
    query.set('token', token || '')
    for (const [k, v] of Object.entries(variables)) {
      if (v) query.append(k, v)
    }
    const a = document.createElement('a')
    a.href = `${baseURL}/templates/${selected.id}/download?${query.toString()}`
    a.style.display = 'none'
    document.body.appendChild(a)
    a.click()
    document.body.removeChild(a)
  }

  const handleCopyAsNew = () => {
    const text = rendered || detail?.content || ''
    navigator.clipboard.writeText(text)
    toast.success('模板内容已复制，可粘贴到 Word 中编辑使用')
  }

  return (
    <div className="space-y-3">
      <p className="text-sm text-gray-500">合同、制度、通知等常用文本模板，支持变量替换</p>

      <div className="flex items-center gap-2">
        <Button size="sm" variant="secondary" onClick={() => setShowHelp(!showHelp)}>
          <HelpCircle className="w-3.5 h-3.5 mr-1" />使用说明
        </Button>
      </div>

      {showHelp && (
        <Card className="bg-blue-50/50">
          <div className="space-y-2 text-xs text-gray-600">
            <div className="flex items-center gap-1.5 font-medium text-gray-700"><BookOpen className="w-3.5 h-3.5" />使用说明</div>
            <div>1. 选择需要的模板分类（合同/制度/通知/协议），点击模板卡片打开详情</div>
            <div>2. 在弹窗中填写变量字段（如公司名称、员工姓名等），点击「渲染模板」生成完整文本</div>
            <div>3. 渲染后可「复制」到剪贴板，或「下载 Word」保存为 .doc 文件</div>
            <div>4. 「复制为新模板」将渲染结果复制到剪贴板，可粘贴到 Word 中进一步编辑</div>
            <div>5. 变量字段为选填，未填写的变量将保留 <code className="px-1 bg-gray-100 rounded">{'{{变量名}}'}</code> 占位符</div>
          </div>
        </Card>
      )}

      <div className="flex gap-2">
        {['', 'CONTRACT', 'RULES', 'NOTICE', 'AGREEMENT', 'OTHER'].map(c => (
          <button
            key={c}
            onClick={() => setCategory(c)}
            className={`px-3 py-1 text-xs rounded-lg ${category === c ? 'bg-primary text-white' : 'bg-gray-100 text-gray-600 hover:bg-gray-200'}`}
          >
            {c === '' ? '全部' : CATEGORY_LABELS[c]}
          </button>
        ))}
      </div>

      {isLoading ? (
        <div className="text-center py-8 text-gray-500">加载中...</div>
      ) : !list || list.length === 0 ? (
        <EmptyState title="暂无模板" />
      ) : (
        <div className="grid grid-cols-1 md:grid-cols-2 gap-2">
          {list.map((t: any) => (
            <Card key={t.id} className="hover:shadow-md transition-shadow cursor-pointer" >
              <div onClick={() => { setSelected(t); setRendered(''); setVariables({}) }}>
                <div className="flex items-center gap-2">
                  <span className="px-1.5 py-0.5 rounded text-xs bg-primary/10 text-primary">{CATEGORY_LABELS[t.category]}</span>
                  <span className="text-sm font-medium truncate">{t.name}</span>
                </div>
                <p className="text-xs text-gray-500 mt-1">{t.description}</p>
                <div className="flex items-center gap-1 mt-2 text-xs text-gray-400">
                  {t.variables?.slice(0, 4).map((v: string) => (
                    <span key={v} className="px-1 py-0.5 rounded bg-gray-100">{VARIABLE_LABELS[v] || v}</span>
                  ))}
                  {t.variables?.length > 4 && <span>+{t.variables.length - 4}</span>}
                </div>
              </div>
            </Card>
          ))}
        </div>
      )}

      {/* 模板详情弹窗 */}
      {selected && (
        <div className="fixed inset-0 bg-black/30 flex items-center justify-center z-50 p-4" onClick={() => setSelected(null)}>
          <Card className="max-w-3xl w-full max-h-[85vh] overflow-y-auto" >
            <div onClick={(e) => e.stopPropagation()}>
              <div className="flex items-center justify-between mb-3">
                <h2 className="text-sm font-medium">{selected.name}</h2>
                <button onClick={() => setSelected(null)} className="text-gray-400 hover:text-gray-600"><X className="w-5 h-5" /></button>
              </div>

              {/* 变量输入 */}
              {detail?.variables && detail.variables.length > 0 && (
                <div className="mb-3 space-y-2">
                  <div className="text-xs font-medium text-gray-600">填写变量</div>
                  <div className="grid grid-cols-2 gap-2">
                    {detail.variables.map((v: string) => (
                      <div key={v}>
                        <label className="text-xs text-gray-500">{VARIABLE_LABELS[v] || v}</label>
                        <input
                          value={variables[v] || ''}
                          onChange={e => setVariables(prev => ({ ...prev, [v]: e.target.value }))}
                          className="w-full px-2 py-1 text-sm border rounded focus:outline-none focus:ring-1 focus:ring-primary"
                          placeholder={`输入${VARIABLE_LABELS[v] || v}`}
                        />
                      </div>
                    ))}
                  </div>
                  <Button size="sm" onClick={handleRender}>渲染模板</Button>
                </div>
              )}

              {/* 渲染结果 */}
              {rendered ? (
                <div>
                  <div className="flex items-center justify-between mb-2">
                    <span className="text-xs font-medium text-gray-600">渲染结果</span>
                    <div className="flex gap-2">
                      <button onClick={handleCopyAsNew} className="flex items-center gap-1 text-xs text-primary hover:underline">
                        <Copy className="w-3 h-3" />复制为新模板
                      </button>
                      <button onClick={handleDownloadWord} className="flex items-center gap-1 text-xs text-primary hover:underline">
                        <Download className="w-3 h-3" />下载 Word
                      </button>
                      <button onClick={handleCopy} className="flex items-center gap-1 text-xs text-primary hover:underline">
                        <Copy className="w-3 h-3" />复制
                      </button>
                    </div>
                  </div>
                  <pre className="text-sm text-gray-700 whitespace-pre-wrap bg-gray-50 p-3 rounded-lg max-h-[50vh] overflow-y-auto">{rendered}</pre>
                </div>
              ) : detail?.content ? (
                <div>
                  <div className="flex items-center justify-between mb-2">
                    <span className="text-xs font-medium text-gray-600">模板原文</span>
                    <div className="flex gap-2">
                      <button onClick={handleDownloadWord} className="flex items-center gap-1 text-xs text-primary hover:underline">
                        <Download className="w-3 h-3" />下载 Word
                      </button>
                    </div>
                  </div>
                  <pre className="text-sm text-gray-700 whitespace-pre-wrap bg-gray-50 p-3 rounded-lg max-h-[50vh] overflow-y-auto">{detail.content}</pre>
                </div>
              ) : null}
            </div>
          </Card>
        </div>
      )}
    </div>
  )
}

function EnterpriseTemplates() {
  const queryClient = useQueryClient()
  const confirm = useConfirm()
  const fileInputRef = useRef<HTMLInputElement>(null)
  const [category, setCategory] = useState<string>('')
  const pageSize = usePageSize()
  const [page, setPage] = useState(1)
  const [showEdit, setShowEdit] = useState(false)
  const [editItem, setEditItem] = useState<any>(null)
  const [form, setForm] = useState({ name: '', category: 'CONTRACT', description: '', content: '' })
  const [selected, setSelected] = useState<any>(null)
  const [rendered, setRendered] = useState('')
  const [variables, setVariables] = useState<Record<string, string>>({})

  const { data: listData, isLoading } = useQuery<any>({
    queryKey: ['enterprise-templates', category, page, pageSize],
    queryFn: async () => {
      const params: any = { page, pageSize }
      if (category) params.category = category
      return await templatesApi.enterpriseList({ page, pageSize, category: category || undefined } as any)
    },
  })
  const list = listData?.items || []
  const total = listData?.total || 0

  const { data: detail } = useQuery<any>({
    queryKey: ['enterprise-template-detail', selected?.id],
    queryFn: async () => {
      return await templatesApi.enterpriseDetail(selected.id)
    },
    enabled: !!selected,
  })

  const saveMutation = useMutation({
    mutationFn: async (data: any) => {
      if (editItem) {
        return await templatesApi.saveEnterprise(data, editItem.id)
      } else {
        return await templatesApi.saveEnterprise(data)
      }
    },
    onSuccess: () => {
      toast.success(editItem ? '已更新' : '已创建')
      queryClient.invalidateQueries({ queryKey: ['enterprise-templates'] })
      setShowEdit(false)
      setEditItem(null)
      setForm({ name: '', category: 'CONTRACT', description: '', content: '' })
    },
    onError: (err: any) => toast.error(err?.response?.data?.error?.message || '操作失败'),
  })

  const deleteMutation = useMutation({
    mutationFn: async (id: string) => {
      await templatesApi.removeEnterprise(id)
    },
    onSuccess: () => {
      toast.success('已删除')
      queryClient.invalidateQueries({ queryKey: ['enterprise-templates'] })
    },
    onError: (err: any) => toast.error(err?.response?.data?.error?.message || '删除失败'),
  })

  const handleRender = async () => {
    if (!selected) return
    try {
      const res = await templatesApi.renderEnterprise(selected.id, variables) as any
      setRendered(res.content)
    } catch {
      toast.error('渲染失败')
    }
  }

  const handleDownloadWord = () => {
    if (!selected) return
    const token = useAuthStore.getState().accessToken
    const baseURL = import.meta.env.DEV ? 'http://localhost:3000/api/v1' : '/api/v1'
    const query = new URLSearchParams()
    query.set('token', token || '')
    for (const [k, v] of Object.entries(variables)) {
      if (v) query.append(k, v)
    }
    const a = document.createElement('a')
    a.href = `${baseURL}/enterprise-templates/${selected.id}/download?${query.toString()}`
    a.style.display = 'none'
    document.body.appendChild(a)
    a.click()
    document.body.removeChild(a)
  }

  const handleEdit = (item: any) => {
    setEditItem(item)
    setForm({ name: item.name, category: item.category, description: item.description || '', content: item.content })
    setShowEdit(true)
  }

  const handleAdd = () => {
    setEditItem(null)
    setForm({ name: '', category: 'CONTRACT', description: '', content: '' })
    setShowEdit(true)
  }

  return (
    <div className="space-y-3">
      <div className="flex items-center justify-between">
        <p className="text-sm text-gray-500">企业自建文本模板，支持变量替换和 Word 下载</p>
        <Button size="sm" onClick={handleAdd}>
          <Plus className="w-4 h-4 mr-1" />新建模板
        </Button>
      </div>

      <div className="flex gap-2">
        {['', 'CONTRACT', 'RULES', 'NOTICE', 'AGREEMENT', 'OTHER'].map(c => (
          <button
            key={c}
            onClick={() => setCategory(c)}
            className={`px-3 py-1 text-xs rounded-lg ${category === c ? 'bg-primary text-white' : 'bg-gray-100 text-gray-600 hover:bg-gray-200'}`}
          >
            {c === '' ? '全部' : CATEGORY_LABELS[c]}
          </button>
        ))}
      </div>

      {isLoading ? (
        <div className="text-center py-8 text-gray-500">加载中...</div>
      ) : !list || list.length === 0 ? (
        <EmptyState title="暂无企业模板" description="点击「新建模板」创建您的第一个企业文本模板" />
      ) : (
        <div className="grid grid-cols-1 md:grid-cols-2 gap-2">
          {list.map((t: any) => (
            <Card key={t.id} className="hover:shadow-md transition-shadow">
              <div onClick={() => { setSelected(t); setRendered(''); setVariables({}) }} className="cursor-pointer">
                <div className="flex items-center gap-2">
                  <span className="px-1.5 py-0.5 rounded text-xs bg-primary/10 text-primary">{CATEGORY_LABELS[t.category]}</span>
                  <span className="text-sm font-medium truncate flex-1">{t.name}</span>
                </div>
                <p className="text-xs text-gray-500 mt-1">{t.description}</p>
                <div className="flex items-center gap-1 mt-2 text-xs text-gray-400">
                  {t.variables?.slice(0, 4).map((v: string) => (
                    <span key={v} className="px-1 py-0.5 rounded bg-gray-100">{VARIABLE_LABELS[v] || v}</span>
                  ))}
                  {t.variables?.length > 4 && <span>+{t.variables.length - 4}</span>}
                </div>
              </div>
              <div className="flex items-center gap-2 mt-2 pt-2 border-t border-gray-100">
                <button onClick={() => handleEdit(t)} className="flex items-center gap-1 text-xs text-gray-500 hover:text-primary">
                  <Edit className="w-3 h-3" />编辑
                </button>
                <button
                  onClick={async () => { if (await confirm({ title: '删除模板', message: '确认删除？' })) deleteMutation.mutate(t.id) }}
                  className="flex items-center gap-1 text-xs text-gray-500 hover:text-red-600"
                >
                  <Trash2 className="w-3 h-3" />删除
                </button>
              </div>
            </Card>
          ))}
        </div>
      )}
      <Pagination
        page={page}
        pageSize={pageSize}
        total={total}
        onPageChange={setPage}
        onPageSizeChange={() => setPage(1)}
      />

      {/* 编辑弹窗 */}
      <Modal open={showEdit} onClose={() => setShowEdit(false)} title={editItem ? '编辑模板' : '新建模板'} size="lg">
        <div className="space-y-3">
          <div>
            <Label>模板名称</Label>
            <Input value={form.name} onChange={(e) => setForm({ ...form, name: e.target.value })} placeholder="如：员工保密协议" />
          </div>
          <div>
            <Label>分类</Label>
            <Select value={form.category} onChange={(e) => setForm({ ...form, category: e.target.value })}>
              {Object.entries(CATEGORY_LABELS).map(([key, label]) => (
                <option key={key} value={key}>{label}</option>
              ))}
            </Select>
          </div>
          <div>
            <Label>描述</Label>
            <Input value={form.description} onChange={(e) => setForm({ ...form, description: e.target.value })} placeholder="简要描述模板用途" />
          </div>
          <div>
            <Label>模板内容</Label>
            <div className="flex items-center gap-2 mb-1">
              <Button size="sm" variant="secondary" className="!h-7" onClick={() => fileInputRef.current?.click()}>
                <Upload className="w-3.5 h-3.5 mr-1" />导入 Word 文档
              </Button>
              <input
                ref={fileInputRef}
                type="file"
                accept=".docx"
                className="hidden"
                onChange={async (e) => {
                  const file = e.target.files?.[0]
                  if (!file) return
                  try {
                    const arrayBuffer = await file.arrayBuffer()
                    const result = await mammoth.convertToHtml({ arrayBuffer })
                    setForm({ ...form, content: result.value })
                    toast.success('文档导入成功')
                  } catch {
                    toast.error('文档解析失败，请确保为 .docx 格式')
                  }
                  e.target.value = ''
                }}
              />
              <span className="text-xs text-gray-400">支持 .docx 格式，导入后转为 HTML</span>
            </div>
            <textarea
              className="w-full px-3 py-2 rounded-md border border-gray-300 focus:outline-none focus:ring-2 focus:ring-primary text-sm min-h-[200px] font-mono"
              value={form.content}
              onChange={(e) => setForm({ ...form, content: e.target.value })}
              placeholder="输入模板内容，使用 {{变量名}} 作为变量占位符，如 {{employeeName}}、{{companyName}}"
            />
          </div>
          <div className="text-xs text-gray-500">
            变量格式：<code className="px-1 bg-gray-100 rounded">{'{{变量名}}'}</code>，如 <code className="px-1 bg-gray-100 rounded">{'{{employeeName}}'}</code>、<code className="px-1 bg-gray-100 rounded">{'{{companyName}}'}</code>
          </div>
          <Button onClick={() => saveMutation.mutate(form)} disabled={saveMutation.isPending}>
            {saveMutation.isPending ? '保存中...' : '保存'}
          </Button>
        </div>
      </Modal>

      {/* 详情弹窗 */}
      {selected && (
        <div className="fixed inset-0 bg-black/30 flex items-center justify-center z-50 p-4" onClick={() => setSelected(null)}>
          <Card className="max-w-3xl w-full max-h-[85vh] overflow-y-auto">
            <div onClick={(e) => e.stopPropagation()}>
              <div className="flex items-center justify-between mb-3">
                <h2 className="text-sm font-medium">{selected.name}</h2>
                <button onClick={() => setSelected(null)} className="text-gray-400 hover:text-gray-600"><X className="w-5 h-5" /></button>
              </div>

              {detail?.variables && detail.variables.length > 0 && (
                <div className="mb-3 space-y-2">
                  <div className="text-xs font-medium text-gray-600">填写变量</div>
                  <div className="grid grid-cols-2 gap-2">
                    {detail.variables.map((v: string) => (
                      <div key={v}>
                        <label className="text-xs text-gray-500">{VARIABLE_LABELS[v] || v}</label>
                        <input
                          value={variables[v] || ''}
                          onChange={e => setVariables(prev => ({ ...prev, [v]: e.target.value }))}
                          className="w-full px-2 py-1 text-sm border rounded focus:outline-none focus:ring-1 focus:ring-primary"
                          placeholder={`输入${VARIABLE_LABELS[v] || v}`}
                        />
                      </div>
                    ))}
                  </div>
                  <Button size="sm" onClick={handleRender}>渲染模板</Button>
                </div>
              )}

              {rendered ? (
                <div>
                  <div className="flex items-center justify-between mb-2">
                    <span className="text-xs font-medium text-gray-600">渲染结果</span>
                    <div className="flex gap-2">
                      <button onClick={handleDownloadWord} className="flex items-center gap-1 text-xs text-primary hover:underline">
                        <Download className="w-3 h-3" />下载 Word
                      </button>
                      <button onClick={() => { navigator.clipboard.writeText(rendered); toast.success('已复制') }} className="flex items-center gap-1 text-xs text-primary hover:underline">
                        <Copy className="w-3 h-3" />复制
                      </button>
                    </div>
                  </div>
                  <pre className="text-sm text-gray-700 whitespace-pre-wrap bg-gray-50 p-3 rounded-lg max-h-[50vh] overflow-y-auto">{rendered}</pre>
                </div>
              ) : detail?.content ? (
                <div>
                  <div className="flex items-center justify-between mb-2">
                    <span className="text-xs font-medium text-gray-600">模板原文</span>
                    <button onClick={handleDownloadWord} className="flex items-center gap-1 text-xs text-primary hover:underline">
                      <Download className="w-3 h-3" />下载 Word
                    </button>
                  </div>
                  <pre className="text-sm text-gray-700 whitespace-pre-wrap bg-gray-50 p-3 rounded-lg max-h-[50vh] overflow-y-auto">{detail.content}</pre>
                </div>
              ) : null}
            </div>
          </Card>
        </div>
      )}
    </div>
  )
}
