// Ticket CNTT — Phase 10.3 G-O6 (S38) + P11-D auto-assign round-robin + SLA timer (S52).
// Read-only kanban list + MaTicket + người xử lý (auto-assign dept IT) + SLA badge (đỏ khi quá hạn).
// File MIRROR SHA256 identical fe-user counterpart.
import { useQuery } from '@tanstack/react-query'
import { Ticket } from 'lucide-react'
import { PageHeader } from '@/components/PageHeader'
import { api } from '@/lib/api'
import { cn } from '@/lib/cn'
import {
  IT_TICKET_CATEGORY_LABELS, IT_TICKET_PRIORITY_BADGE, IT_TICKET_PRIORITY_LABELS,
  IT_TICKET_STATUS_LABELS, type ItTicketDto, type PagedResult,
} from '@/types/workflowApps'

function formatSlaDue(iso: string): string {
  return new Date(iso).toLocaleString('vi-VN', {
    day: '2-digit', month: '2-digit', hour: '2-digit', minute: '2-digit',
  })
}

export function ItTicketsPage() {
  const list = useQuery({
    queryKey: ['it-tickets'],
    queryFn: async () => (await api.get<PagedResult<ItTicketDto>>('/it-tickets', { params: { pageSize: 100 } })).data,
  })

  const items = list.data?.items ?? []

  // Group by status for kanban-ish display
  const grouped: Record<number, ItTicketDto[]> = { 1: [], 2: [], 3: [], 4: [], 5: [] }
  items.forEach((t) => {
    if (grouped[t.status]) grouped[t.status].push(t)
  })

  return (
    <div className="space-y-4">
      <PageHeader title="Ticket CNTT" description="Helpdesk — báo lỗi và yêu cầu hỗ trợ kỹ thuật" />

      <div className="grid grid-cols-1 md:grid-cols-3 lg:grid-cols-5 gap-3">
        {[1, 2, 3, 5, 4].map((statusKey) => (
          <div key={statusKey} className="rounded-lg border bg-card p-3">
            <h3 className="font-medium text-sm mb-2">
              {IT_TICKET_STATUS_LABELS[statusKey]} <span className="text-xs text-muted-foreground">({grouped[statusKey].length})</span>
            </h3>
            <div className="space-y-2">
              {list.isLoading && <div className="text-xs text-muted-foreground">Đang tải...</div>}
              {!list.isLoading && grouped[statusKey].length === 0 && (
                <div className="text-xs text-muted-foreground italic">Trống</div>
              )}
              {grouped[statusKey].map((t) => (
                <div key={t.id} className="rounded border p-2 text-xs space-y-1 bg-background">
                  <div className="flex items-center justify-between">
                    <span className="font-mono text-[10px] text-muted-foreground">{t.maTicket ?? '—'}</span>
                    <span className={cn('rounded px-1.5 py-0.5 text-[10px]', IT_TICKET_PRIORITY_BADGE[t.priority])}>
                      {IT_TICKET_PRIORITY_LABELS[t.priority]}
                    </span>
                  </div>
                  <div className="font-medium truncate">{t.title}</div>
                  <div className="text-muted-foreground">
                    {IT_TICKET_CATEGORY_LABELS[t.category]} · {t.requesterFullName}
                  </div>
                  <div className="flex items-center justify-between gap-1 pt-0.5">
                    <span className="text-muted-foreground truncate" title={t.assignedToFullName ?? undefined}>
                      👤 {t.assignedToFullName ?? <span className="italic">Chưa giao</span>}
                    </span>
                    {t.slaDueAt && (
                      <span
                        className={cn(
                          'rounded px-1.5 py-0.5 text-[10px] whitespace-nowrap',
                          t.slaBreached ? 'bg-red-100 text-red-700 font-medium' : 'bg-slate-100 text-slate-600',
                        )}
                        title={`Hạn xử lý SLA: ${formatSlaDue(t.slaDueAt)}`}
                      >
                        {t.slaBreached ? 'Quá hạn SLA' : `SLA ${formatSlaDue(t.slaDueAt)}`}
                      </span>
                    )}
                  </div>
                </div>
              ))}
            </div>
          </div>
        ))}
      </div>

      {!list.isLoading && items.length === 0 && (
        <div className="rounded-lg border bg-card p-8 text-center text-muted-foreground">
          <Ticket className="mx-auto h-10 w-10 mb-3 opacity-50" />
          Chưa có ticket nào.
        </div>
      )}
    </div>
  )
}