'use client'

import { useState } from 'react'
import { useRouter } from 'next/navigation'
import { Card, CardContent, CardHeader } from '@/components/ui/card'
import { Button } from '@/components/ui/button'
import { Input } from '@/components/ui/input'
import { Textarea } from '@/components/ui/textarea'
import { Badge } from '@/components/ui/badge'
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuSeparator,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu'
import {
  Laptop,
  Link2,
  MoreHorizontal,
  Trash2,
  Edit3,
  Check,
  X,
  Tag,
  StickyNote,
} from 'lucide-react'
import { formatDistanceToNow } from 'date-fns'
import Link from 'next/link'

interface Group {
  id: string
  name: string
}

interface Machine {
  id: string
  name: string
  hostname: string | null
  os: string | null
  osVersion: string | null
  agentVersion: string | null
  lastSeen: Date | null
  isOnline: boolean
  tags: string[] | null
  notes: string | null
  groupId: string | null
}

interface MachineCardProps {
  machine: Machine
  groups: Group[]
}

const TAG_COLORS: Record<string, string> = {
  server: 'bg-blue-500/10 text-blue-500 border-blue-500/20',
  windows: 'bg-cyan-500/10 text-cyan-500 border-cyan-500/20',
  linux: 'bg-orange-500/10 text-orange-500 border-orange-500/20',
  mac: 'bg-gray-500/10 text-gray-400 border-gray-500/20',
  workstation: 'bg-purple-500/10 text-purple-500 border-purple-500/20',
  laptop: 'bg-green-500/10 text-green-500 border-green-500/20',
}

function tagColor(tag: string) {
  return TAG_COLORS[tag.toLowerCase()] || 'bg-muted text-muted-foreground border-border/50'
}

export function MachineCard({ machine, groups }: MachineCardProps) {
  const router = useRouter()
  const [editing, setEditing] = useState(false)
  const [name, setName] = useState(machine.name)
  const [notes, setNotes] = useState(machine.notes ?? '')
  const [tagInput, setTagInput] = useState('')
  const [tags, setTags] = useState<string[]>(machine.tags ?? [])
  const [groupId, setGroupId] = useState(machine.groupId ?? '')
  const [saving, setSaving] = useState(false)
  const [showNotes, setShowNotes] = useState(false)

  const save = async () => {
    setSaving(true)
    await fetch(`/api/machines/${machine.id}`, {
      method: 'PATCH',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({ name, notes: notes || null, tags, groupId: groupId || null }),
    })
    setSaving(false)
    setEditing(false)
    router.refresh()
  }

  const cancel = () => {
    setName(machine.name)
    setNotes(machine.notes ?? '')
    setTags(machine.tags ?? [])
    setGroupId(machine.groupId ?? '')
    setEditing(false)
  }

  const addTag = () => {
    const t = tagInput.trim().toLowerCase().replace(/\s+/g, '-')
    if (t && !tags.includes(t)) setTags([...tags, t])
    setTagInput('')
  }

  const removeTag = (t: string) => setTags(tags.filter(x => x !== t))

  const deleteMachine = async () => {
    if (!confirm(`Delete "${machine.name}"? This cannot be undone.`)) return
    await fetch(`/api/machines/${machine.id}`, { method: 'DELETE' })
    router.refresh()
  }

  const currentGroup = groups.find(g => g.id === (groupId || machine.groupId))

  return (
    <Card className="border-border/50">
      <CardHeader className="flex flex-row items-start justify-between space-y-0 pb-2">
        <div className="flex items-center gap-3 min-w-0">
          <div className={`flex h-10 w-10 items-center justify-center rounded-lg shrink-0 ${machine.isOnline ? 'bg-green-500/10 text-green-500' : 'bg-muted text-muted-foreground'}`}>
            <Laptop className="h-5 w-5" />
          </div>
          <div className="min-w-0">
            {editing ? (
              <Input
                value={name}
                onChange={e => setName(e.target.value)}
                className="h-7 text-sm font-semibold"
                autoFocus
              />
            ) : (
              <p className="text-sm font-semibold truncate">{machine.name}</p>
            )}
            <p className="text-xs text-muted-foreground truncate">{machine.hostname || 'Unknown host'}</p>
          </div>
        </div>

        <DropdownMenu>
          <DropdownMenuTrigger asChild>
            <Button variant="ghost" size="icon" className="h-7 w-7 shrink-0">
              <MoreHorizontal className="h-4 w-4" />
            </Button>
          </DropdownMenuTrigger>
          <DropdownMenuContent align="end">
            <DropdownMenuItem onClick={() => setEditing(true)}>
              <Edit3 className="mr-2 h-4 w-4" />
              Edit
            </DropdownMenuItem>
            <DropdownMenuItem onClick={() => setShowNotes(v => !v)}>
              <StickyNote className="mr-2 h-4 w-4" />
              {showNotes ? 'Hide notes' : 'Show notes'}
            </DropdownMenuItem>
            <DropdownMenuSeparator />
            <DropdownMenuItem onClick={deleteMachine} className="text-destructive">
              <Trash2 className="mr-2 h-4 w-4" />
              Delete
            </DropdownMenuItem>
          </DropdownMenuContent>
        </DropdownMenu>
      </CardHeader>

      <CardContent className="space-y-3">
        {/* Tags */}
        <div className="flex flex-wrap gap-1 min-h-5">
          {tags.map(t => (
            <Badge
              key={t}
              variant="outline"
              className={`text-xs py-0 h-5 ${tagColor(t)}`}
            >
              {t}
              {editing && (
                <button onClick={() => removeTag(t)} className="ml-1 hover:text-destructive">
                  <X className="h-2.5 w-2.5" />
                </button>
              )}
            </Badge>
          ))}
          {editing && (
            <div className="flex gap-1">
              <Input
                value={tagInput}
                onChange={e => setTagInput(e.target.value)}
                onKeyDown={e => { if (e.key === 'Enter') { e.preventDefault(); addTag() } }}
                placeholder="Add tag…"
                className="h-5 text-xs py-0 px-1.5 w-20"
              />
              <Button size="sm" variant="ghost" className="h-5 px-1" onClick={addTag}>
                <Tag className="h-3 w-3" />
              </Button>
            </div>
          )}
        </div>

        {/* Group */}
        {editing ? (
          <div>
            <label className="text-xs text-muted-foreground">Group</label>
            <select
              value={groupId}
              onChange={e => setGroupId(e.target.value)}
              className="mt-0.5 w-full text-xs rounded border border-border bg-background px-2 py-1"
            >
              <option value="">No group</option>
              {groups.map(g => (
                <option key={g.id} value={g.id}>{g.name}</option>
              ))}
            </select>
          </div>
        ) : currentGroup ? (
          <p className="text-xs text-muted-foreground">Group: {currentGroup.name}</p>
        ) : null}

        {/* Stats */}
        <div className="grid grid-cols-2 gap-1 text-xs">
          <div className="text-muted-foreground">Status</div>
          <div className={`flex items-center gap-1.5 ${machine.isOnline ? 'text-green-500' : 'text-muted-foreground'}`}>
            <span className={`h-1.5 w-1.5 rounded-full ${machine.isOnline ? 'bg-green-500' : 'bg-muted-foreground/30'}`} />
            {machine.isOnline ? 'Online' : 'Offline'}
          </div>
          <div className="text-muted-foreground">OS</div>
          <div className="truncate">{machine.os || 'Unknown'} {machine.osVersion || ''}</div>
          <div className="text-muted-foreground">Last seen</div>
          <div className="truncate">
            {machine.lastSeen ? formatDistanceToNow(new Date(machine.lastSeen), { addSuffix: true }) : 'Never'}
          </div>
          <div className="text-muted-foreground">Agent</div>
          <div className="font-mono">{machine.agentVersion || 'N/A'}</div>
        </div>

        {/* Notes */}
        {(showNotes || editing) && (
          <div>
            {editing ? (
              <Textarea
                value={notes}
                onChange={e => setNotes(e.target.value)}
                placeholder="Add notes about this machine…"
                className="text-xs min-h-16 resize-none"
              />
            ) : notes ? (
              <p className="text-xs text-muted-foreground bg-muted/30 rounded p-2">{notes}</p>
            ) : (
              <p className="text-xs text-muted-foreground italic">No notes</p>
            )}
          </div>
        )}

        {/* Edit controls */}
        {editing && (
          <div className="flex gap-2">
            <Button size="sm" className="flex-1 h-7 text-xs" onClick={save} disabled={saving}>
              <Check className="mr-1 h-3 w-3" />
              {saving ? 'Saving…' : 'Save'}
            </Button>
            <Button size="sm" variant="ghost" className="h-7 text-xs" onClick={cancel}>
              Cancel
            </Button>
          </div>
        )}

        {/* Connect */}
        {!editing && (
          <Button className="w-full" size="sm" disabled={!machine.isOnline} asChild={machine.isOnline}>
            {machine.isOnline ? (
              <Link href={`/dashboard/connect?machineId=${machine.id}`}>
                <Link2 className="mr-2 h-4 w-4" />
                Connect
              </Link>
            ) : (
              <>
                <Link2 className="mr-2 h-4 w-4" />
                Connect
              </>
            )}
          </Button>
        )}
      </CardContent>
    </Card>
  )
}