import * as React from 'react'

import { AppDataTable, type AppDataTableColumn } from '@/components/app/AppDataTable'
import { AppEmptyState } from '@/components/app/AppEmptyState'
import { AppFilterBar } from '@/components/app/AppFilterBar'
import { AppPageHeader } from '@/components/app/AppPageHeader'
import { AppPriorityBadge } from '@/components/app/AppPriorityBadge'
import { AppStatusBadge } from '@/components/app/AppStatusBadge'
import { Button } from '@/components/ui/button'
import { Card, CardContent } from '@/components/ui/card'
import { Input } from '@/components/ui/input'
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select'
import { formatDateTime } from '@/lib/format'

import { listTickets } from './api'
import type { Ticket } from './types'

const columns: AppDataTableColumn<Ticket>[] = [
  {
    key: 'ticket_no',
    header: '编号',
    cell: (ticket) => <span className="font-medium text-foreground">{ticket.ticket_no}</span>
  },
  {
    key: 'title',
    header: '标题',
    cell: (ticket) => <span className="line-clamp-1">{ticket.title}</span>
  },
  {
    key: 'status',
    header: '状态',
    cell: (ticket) => <AppStatusBadge status={ticket.status} />
  },
  {
    key: 'priority',
    header: '优先级',
    cell: (ticket) => <AppPriorityBadge priority={ticket.priority} />
  },
  {
    key: 'related_system',
    header: '关联系统',
    cell: (ticket) => <span className="text-muted-foreground">{ticket.related_system || '-'}</span>
  },
  {
    key: 'impact_scope',
    header: '影响范围',
    cell: (ticket) => <span className="text-muted-foreground">{ticket.impact_scope || '-'}</span>
  },
  {
    key: 'created_at',
    header: '创建时间',
    cell: (ticket) => <span className="text-muted-foreground">{formatDateTime(ticket.created_at)}</span>
  },
  {
    key: 'actions',
    header: '操作',
    cell: (ticket) => (
      <Button
        variant="ghost"
        onClick={(event) => {
          event.stopPropagation()
          window.location.hash = `/tickets/${ticket.id}`
        }}
      >
        查看详情
      </Button>
    )
  }
]

export function TicketListPage() {
  const [tickets, setTickets] = React.useState<Ticket[]>([])
  const [status, setStatus] = React.useState('all')
  const [priority, setPriority] = React.useState('all')
  const [q, setQ] = React.useState('')
  const [error, setError] = React.useState('')

  React.useEffect(() => {
    listTickets({ status: status === 'all' ? '' : status, q })
      .then(setTickets)
      .catch((reason: unknown) => setError(reason instanceof Error ? reason.message : '加载失败'))
  }, [status, q])

  const visibleTickets = priority === 'all' ? tickets : tickets.filter((ticket) => ticket.priority === priority)
  const metrics = [
    { label: '待处理', value: tickets.filter((ticket) => ticket.status === 'pending').length },
    { label: '处理中', value: tickets.filter((ticket) => ticket.status === 'in_progress').length },
    { label: '待确认', value: tickets.filter((ticket) => ticket.status === 'pending_confirm').length },
    { label: '已解决', value: tickets.filter((ticket) => ticket.status === 'resolved' || ticket.status === 'closed').length }
  ]

  function resetFilters() {
    setStatus('all')
    setPriority('all')
    setQ('')
  }

  return (
    <main className="min-h-screen bg-background p-6 text-foreground">
      <div className="mx-auto flex max-w-7xl flex-col gap-4">
        <AppPageHeader
          title="工单中心"
          description="统一查看、筛选和处理技术支持工单。"
          actions={<Button onClick={() => (window.location.hash = '/tickets/new')}>新建工单</Button>}
        />

        <div className="grid gap-3 md:grid-cols-4">
          {metrics.map((metric) => (
            <Card key={metric.label}>
              <CardContent>
                <p className="text-sm text-muted-foreground">{metric.label}</p>
                <p className="mt-2 text-2xl font-semibold text-foreground">{metric.value}</p>
              </CardContent>
            </Card>
          ))}
        </div>

        <AppFilterBar actions={<Button variant="outline" onClick={resetFilters}>重置筛选</Button>}>
          <Input onChange={(event) => setQ(event.target.value)} placeholder="搜索工单编号或标题" value={q} />
          <Select onValueChange={setStatus} value={status}>
            <SelectTrigger className="w-full">
              <SelectValue placeholder="全部状态" />
            </SelectTrigger>
            <SelectContent>
              <SelectItem value="all">全部状态</SelectItem>
              <SelectItem value="pending">待处理</SelectItem>
              <SelectItem value="in_progress">处理中</SelectItem>
              <SelectItem value="pending_confirm">待确认</SelectItem>
              <SelectItem value="resolved">已解决</SelectItem>
              <SelectItem value="closed">已关闭</SelectItem>
            </SelectContent>
          </Select>
          <Select onValueChange={setPriority} value={priority}>
            <SelectTrigger className="w-full">
              <SelectValue placeholder="全部优先级" />
            </SelectTrigger>
            <SelectContent>
              <SelectItem value="all">全部优先级</SelectItem>
              <SelectItem value="low">低</SelectItem>
              <SelectItem value="medium">中</SelectItem>
              <SelectItem value="high">高</SelectItem>
              <SelectItem value="urgent">紧急</SelectItem>
            </SelectContent>
          </Select>
        </AppFilterBar>

        {error ? <AppEmptyState title="无法加载工单" description={error} /> : null}
        {!error ? (
          <AppDataTable
            columns={columns}
            rows={visibleTickets}
            getRowKey={(ticket) => ticket.id}
            emptyTitle="暂无工单"
            emptyDescription="创建第一张工单后，列表会显示在这里。"
            footer={<p className="text-sm text-muted-foreground">当前显示 {visibleTickets.length} 条工单</p>}
            onRowClick={(ticket) => (window.location.hash = `/tickets/${ticket.id}`)}
          />
        ) : null}
      </div>
    </main>
  )
}