import { useState, useMemo } from 'react'
import { Table, TableHeader, TableBody, TableRow, TableHead, TableCell } from '../ui/Table'
import { Badge } from '../ui/Badge'
import { Kbd } from '../ui/Kbd'
import { EmptyState, EmptyStateIcon, EmptyStateTitle, EmptyStateDescription } from '../ui/EmptyState'
import { Icon } from '../Icon'

type Service = {
  id: string
  name: string
  region: string
  status: 'healthy' | 'degraded' | 'scaling'
  latency: string
  memory: string
  instances: number
}

const INITIAL_SERVICES: Service[] = [
  { id: '1', name: 'api-gateway', region: 'us-east-1', status: 'healthy', latency: '12ms', memory: '128 MB', instances: 8 },
  { id: '2', name: 'vector-indexer', region: 'eu-central-1', status: 'healthy', latency: '34ms', memory: '890 MB', instances: 4 },
  { id: '3', name: 'model-inference', region: 'us-west-2', status: 'scaling', latency: '78ms', memory: '4.2 GB', instances: 16 },
  { id: '4', name: 'session-broker', region: 'us-east-1', status: 'healthy', latency: '8ms', memory: '64 MB', instances: 6 },
  { id: '5', name: 'analytics-worker', region: 'ap-northeast-1', status: 'degraded', latency: '142ms', memory: '1.8 GB', instances: 2 },
  { id: '6', name: 'audit-logger', region: 'eu-west-1', status: 'healthy', latency: '19ms', memory: '210 MB', instances: 3 },
]

export function ServiceTable() {
  const [search, setSearch] = useState('')
  const [filterStatus, setFilterStatus] = useState<string>('all')

  const filteredServices = useMemo(() => {
    return INITIAL_SERVICES.filter(svc => {
      const matchesSearch = svc.name.toLowerCase().includes(search.toLowerCase()) ||
        svc.region.toLowerCase().includes(search.toLowerCase())
      const matchesStatus = filterStatus === 'all' || svc.status === filterStatus
      return matchesSearch && matchesStatus
    })
  }, [search, filterStatus])

  return (
    <div className="stack-md">
      {/* Table Toolbar */}
      <div className="flex-between" style={{ flexWrap: 'wrap', gap: 'var(--space-3)' }}>
        <div className="icon-search-bar" style={{ maxWidth: 320 }}>
          <Icon name="search" size={15} />
          <input
            type="text"
            placeholder="Filter services or regions..."
            value={search}
            onChange={e => setSearch(e.target.value)}
            className="icon-search-input"
          />
          {search && (
            <button className="icon-clear-btn" onClick={() => setSearch('')}>
              <Icon name="close" size={13} />
            </button>
          )}
        </div>

        <div className="row-xs">
          {['all', 'healthy', 'scaling', 'degraded'].map(st => (
            <button
              key={st}
              className={`button ${filterStatus === st ? 'secondary' : 'ghost'}`}
              style={{
                padding: 'var(--space-1) var(--space-3)',
                fontSize: 'var(--text-xs)',
                textTransform: 'capitalize',
              }}
              onClick={() => setFilterStatus(st)}
            >
              {st}
            </button>
          ))}
        </div>
      </div>

      {/* Table Surface */}
      {filteredServices.length > 0 ? (
        <Table>
          <TableHeader>
            <TableRow>
              <TableHead>Service Name</TableHead>
              <TableHead>Region</TableHead>
              <TableHead>Status</TableHead>
              <TableHead>P99 Latency</TableHead>
              <TableHead>Memory</TableHead>
              <TableHead>Nodes</TableHead>
            </TableRow>
          </TableHeader>
          <TableBody>
            {filteredServices.map(svc => (
              <TableRow key={svc.id}>
                <TableCell style={{ fontWeight: 600 }}>
                  <div className="row-xs" style={{ alignItems: 'center' }}>
                    <span
                      style={{
                        width: 7,
                        height: 7,
                        borderRadius: '50%',
                        background: svc.status === 'healthy' ? 'var(--chart-2)' : svc.status === 'scaling' ? 'var(--primary)' : 'var(--destructive)',
                        boxShadow: `0 0 8px ${svc.status === 'healthy' ? 'var(--chart-2)' : svc.status === 'scaling' ? 'var(--primary)' : 'var(--destructive)'}`,
                      }}
                    />
                    {svc.name}
                  </div>
                </TableCell>
                <TableCell>
                  <Kbd>{svc.region}</Kbd>
                </TableCell>
                <TableCell>
                  <Badge
                    variant={svc.status === 'healthy' ? 'positive' : svc.status === 'scaling' ? 'primary' : 'destructive'}
                  >
                    {svc.status}
                  </Badge>
                </TableCell>
                <TableCell className="mono" style={{ color: svc.status === 'degraded' ? 'var(--destructive)' : 'var(--primary)' }}>
                  {svc.latency}
                </TableCell>
                <TableCell className="mono" style={{ color: 'var(--muted-foreground)' }}>
                  {svc.memory}
                </TableCell>
                <TableCell className="mono" style={{ color: 'var(--foreground)' }}>
                  {svc.instances}
                </TableCell>
              </TableRow>
            ))}
          </TableBody>
        </Table>
      ) : (
        <EmptyState>
          <EmptyStateIcon>
            <Icon name="search" size={24} />
          </EmptyStateIcon>
          <EmptyStateTitle>No matching services</EmptyStateTitle>
          <EmptyStateDescription>
            No active nodes or services match the current filter query "{search}".
          </EmptyStateDescription>
        </EmptyState>
      )}

      <div className="flex-between muted" style={{ fontSize: 'var(--text-3xs)', padding: '0 var(--space-2)' }}>
        <span>Showing {filteredServices.length} of {INITIAL_SERVICES.length} deployed services</span>
        <span className="mono">Synced live via cluster coordinator</span>
      </div>
    </div>
  )
}