import { useState, type ReactNode } from 'react'
import { ChevronUp, ChevronDown, ChevronsUpDown } from 'lucide-react'
import { cn } from '@/lib/utils'

export interface Column<T> {
  key: string
  header: string
  render: (item: T) => ReactNode
  sortable?: boolean
  className?: string
}

interface DataTableProps<T> {
  columns: Column<T>[]
  data: T[]
  keyExtractor: (item: T) => string
  isLoading?: boolean
  skeletonRows?: number
  onSort?: (key: string, direction: 'asc' | 'desc') => void
  sortKey?: string
  sortDirection?: 'asc' | 'desc'
  emptyState?: ReactNode
}

export function DataTable<T>({
  columns,
  data,
  keyExtractor,
  isLoading = false,
  skeletonRows = 5,
  onSort,
  sortKey,
  sortDirection,
  emptyState,
}: DataTableProps<T>) {
  const [localSortKey, setLocalSortKey] = useState<string | null>(null)
  const [localSortDir, setLocalSortDir] = useState<'asc' | 'desc'>('asc')

  const activeSortKey = sortKey ?? localSortKey
  const activeSortDir = sortDirection ?? localSortDir

  const handleSort = (key: string) => {
    const newDir = activeSortKey === key && activeSortDir === 'asc' ? 'desc' : 'asc'
    if (onSort) {
      onSort(key, newDir)
    } else {
      setLocalSortKey(key)
      setLocalSortDir(newDir)
    }
  }

  return (
    <div className="overflow-x-auto rounded-lg border border-border">
      <table className="w-full text-sm">
        <thead>
          <tr className="border-b border-border bg-elevated">
            {columns.map((col) => (
              <th
                key={col.key}
                className={cn(
                  'px-4 py-3 text-left text-xs font-medium uppercase tracking-wider text-muted-foreground',
                  col.sortable && 'cursor-pointer select-none hover:text-foreground',
                  col.className
                )}
                onClick={col.sortable ? () => handleSort(col.key) : undefined}
              >
                <div className="flex items-center gap-1">
                  {col.header}
                  {col.sortable && (
                    <span className="inline-flex">
                      {activeSortKey === col.key ? (
                        activeSortDir === 'asc' ? (
                          <ChevronUp className="h-4 w-4" />
                        ) : (
                          <ChevronDown className="h-4 w-4" />
                        )
                      ) : (
                        <ChevronsUpDown className="h-3.5 w-3.5 opacity-40" />
                      )}
                    </span>
                  )}
                </div>
              </th>
            ))}
          </tr>
        </thead>
        <tbody>
          {isLoading ? (
            Array.from({ length: skeletonRows }).map((_, i) => (
              <tr key={i} className="border-b border-border last:border-0">
                {columns.map((col) => (
                  <td key={col.key} className="px-4 py-3">
                    <div className="h-4 w-3/4 animate-pulse rounded bg-muted" />
                  </td>
                ))}
              </tr>
            ))
          ) : data.length === 0 ? (
            <tr>
              <td colSpan={columns.length} className="px-4 py-12 text-center">
                {emptyState || (
                  <span className="text-muted-foreground">No data found</span>
                )}
              </td>
            </tr>
          ) : (
            data.map((item) => (
              <tr
                key={keyExtractor(item)}
                className="border-b border-border last:border-0 hover:bg-elevated transition-colors"
              >
                {columns.map((col) => (
                  <td key={col.key} className={cn('px-4 py-3', col.className)}>
                    {col.render(item)}
                  </td>
                ))}
              </tr>
            ))
          )}
        </tbody>
      </table>
    </div>
  )
}

export default DataTable
