import { useState, useEffect } from 'react'
import { HardDrive, Plus, Trash2, CheckCircle, AlertCircle, AlertTriangle, RefreshCw, Wrench, Folder, File, ArrowUp, FolderPlus } from 'lucide-react'
import { api } from '../lib/api'
import { useToast } from '../context/ToastContext'
import { Card, CardHeader, CardTitle, CardContent } from './ui/Card'
import { Button } from './ui/Button'
import { Input, Select } from './ui/Input'

interface Mount {
  name: string
  type: string
  source: string
  mounted: boolean
  reachable?: boolean
  has_credentials: boolean
}

interface Target {
  name: string
  path: string
  is_mount: boolean
  free_gb: number | null
}

export default function StorageMounts() {
  const [mounts, setMounts] = useState<Mount[]>([])
  const [targets, setTargets] = useState<Target[]>([])
  const [name, setName] = useState('')
  const [typ, setTyp] = useState<'nfs' | 'cifs'>('cifs')
  const [source, setSource] = useState('')
  const [host, setHost] = useState('')
  const [shares, setShares] = useState<string[]>([])
  const [selectedShare, setSelectedShare] = useState('')
  const [sharesBusy, setSharesBusy] = useState(false)
  const [username, setUsername] = useState('')
  const [password, setPassword] = useState('')
  const [busy, setBusy] = useState(false)
  const [feedback, setFeedback] = useState<string | null>(null)
  const [browsePath, setBrowsePath] = useState('/app/media')
  const [browseParent, setBrowseParent] = useState<string | null>(null)
  const [browseDirs, setBrowseDirs] = useState<{ name: string, path: string }[]>([])
  const [browseFiles, setBrowseFiles] = useState<{ name: string, size_mb: number | null }[]>([])
  const [neuerOrdner, setNeuerOrdner] = useState('')
  const [browserOffen, setBrowserOffen] = useState(false)
  const { toast } = useToast()

  const browsen = async (pfad: string) => {
    try {
      const r = await api.get('/browse', { params: { path: pfad } })
      setBrowsePath(r.data.path)
      setBrowseParent(r.data.parent)
      setBrowseDirs(r.data.dirs)
      setBrowseFiles(r.data.files || [])
    } catch {
      setBrowseDirs([])
      setBrowseFiles([])
    }
  }

  const ordnerAnlegen = async () => {
    if (!neuerOrdner) return
    try {
      await api.post('/browse/mkdir', { path: browsePath, name: neuerOrdner })
      setNeuerOrdner('')
      browsen(browsePath)
      laden()
    } catch (e: any) {
      setFeedback(`✗ ${e?.response?.data?.detail || 'Ordner anlegen fehlgeschlagen'}`)
    }
  }

  const laden = async (manuell = false) => {
    try {
      const [m, t] = await Promise.allSettled([
        api.get('/storage-mounts'),
        api.get('/storage-targets'),
      ])
      if (m.status === 'fulfilled') setMounts(m.value.data || [])
      if (t.status === 'fulfilled') setTargets(t.value.data || [])
      if (manuell) toast('success', 'Speicherziele aktualisiert')
    } catch {
      if (manuell) toast('error', 'Speicherziele konnten nicht geladen werden')
    }
  }

  useEffect(() => { laden(); browsen('/app/media') }, [])

  const freigabenAuflisten = async () => {
    if (!host) return
    setSharesBusy(true)
    setFeedback(null)
    try {
      const r = await api.get('/storage-mounts/shares', {
        params: { host, ...(username ? { username, password } : {}) },
      })
      setShares(r.data.shares)
      if (r.data.shares.length === 0) {
        setFeedback('✗ Keine Freigaben gefunden — Rechner erreichbar und Freigaben aktiv?')
      } else {
        setSelectedShare(r.data.shares[0])
      }
    } catch (e: any) {
      setFeedback(`✗ ${e?.response?.data?.detail || 'Freigaben-Abfrage fehlgeschlagen'}`)
      setShares([])
    } finally {
      setSharesBusy(false)
    }
  }

  const hinzufuegen = async () => {
    setBusy(true)
    setFeedback(null)
    const quelle = typ === 'cifs' && host && selectedShare ? `//${host}/${selectedShare}` : source
    const zielName = name
    try {
      const r = await api.post('/storage-mounts', {
        name, type: typ, source: quelle,
        ...(username ? { username, password } : {}),
      })
      if (r.data.writable) {
        setFeedback(`✓ „${zielName}" eingehängt — Schreibtest OK, ab sofort als Rip-Ziel wählbar`)
        toast('success', `„${zielName}" eingehängt — Schreibtest OK`)
      } else {
        setFeedback(`⚠️ „${zielName}" eingehängt, aber NUR LESBAR — Freigabe-Rechte prüfen!`)
        toast('error', `„${zielName}" ist nur lesbar — Freigabe-Rechte prüfen`)
      }
      setName(''); setSource(''); setHost(''); setShares([]); setSelectedShare(''); setUsername(''); setPassword('')
      laden()
    } catch (e: any) {
      const detail = e?.response?.data?.detail || 'Einhängen fehlgeschlagen'
      setFeedback(`✗ ${detail}`)
      toast('error', `„${zielName}": ${detail}`)
    } finally {
      setBusy(false)
    }
  }

  const entfernen = async (mountName: string) => {
    setBusy(true)
    try {
      await api.delete(`/storage-mounts/${mountName}`)
      toast('success', `„${mountName}" ausgehängt und entfernt`)
      laden()
    } catch (e: any) {
      const detail = e?.response?.data?.detail || 'Entfernen fehlgeschlagen'
      setFeedback(`✗ ${detail}`)
      toast('error', detail)
    } finally {
      setBusy(false)
    }
  }

  const reparieren = async (mountName: string) => {
    setBusy(true)
    try {
      const r = await api.post(`/storage-mounts/${mountName}/repair`)
      toast(r.data.writable ? 'success' : 'error',
        r.data.writable ? `„${mountName}" neu verbunden` : `„${mountName}" verbunden, aber nur lesbar`)
      laden()
    } catch (e: any) {
      toast('error', e?.response?.data?.detail || 'Reparatur fehlgeschlagen — NAS erreichbar?')
    } finally {
      setBusy(false)
    }
  }

  return (
    <div className="space-y-6">
      {/* Vorhandene Ziele */}
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <HardDrive size={20} className="text-amber-500" />
            <span>Verfügbare Ziele</span>
          </CardTitle>
          <Button variant="ghost" size="sm" onClick={() => laden(true)} title="Ziele neu laden">
            <RefreshCw size={16} />
          </Button>
        </CardHeader>
        <CardContent>
          {targets.length === 0 ? (
            <p className="text-sm text-slate-500 dark:text-slate-400">Noch keine Unterordner in /app/media — sie entstehen beim ersten Rip oder Mount.</p>
          ) : (
            <div className="space-y-2.5">
              {targets.map(t => (
                <div key={t.path} className="flex items-center justify-between p-3.5 rounded-xl border border-slate-200/80 dark:border-slate-800 bg-slate-50 dark:bg-slate-950/80">
                  <div className="flex items-center gap-3">
                    <HardDrive size={18} className={t.is_mount ? 'text-amber-500' : 'text-slate-400 dark:text-slate-500'} />
                    <div>
                      <span className="text-sm font-medium text-slate-900 dark:text-slate-200">{t.name}</span>
                      <span className="text-xs ml-2 text-slate-500 dark:text-slate-400">
                        {t.is_mount ? 'Netzwerk-Mount' : 'lokal'}{t.free_gb != null ? ` · ${t.free_gb} GB frei` : ''}
                      </span>
                    </div>
                  </div>
                  {mounts.some(m => m.name === t.name) && (
                    <button onClick={() => entfernen(t.name)} disabled={busy} className="p-1.5 rounded-lg text-rose-500 hover:bg-rose-500/10 transition-colors">
                      <Trash2 size={16} />
                    </button>
                  )}
                </div>
              ))}
            </div>
          )}
        </CardContent>
      </Card>

      {/* Netzwerk-Mounts mit Status — zeigt AUCH tote/getrennte Mounts, damit
          man sie reparieren oder entfernen kann (Bug 24.07.: ein toter NAS-Mount
          verschwand aus „Verfügbare Ziele" und ließ sich nicht neu anlegen). */}
      {mounts.length > 0 && (
        <Card>
          <CardHeader>
            <CardTitle className="flex items-center gap-2">
              <HardDrive size={20} className="text-amber-500" />
              <span>Netzwerk-Mounts</span>
            </CardTitle>
          </CardHeader>
          <CardContent>
            <div className="space-y-2.5">
              {mounts.map(m => {
                const aktiv = m.mounted && m.reachable !== false
                const tot = m.mounted && m.reachable === false
                return (
                  <div key={m.name} className="flex items-center justify-between gap-3 p-3.5 rounded-xl border border-slate-200/80 dark:border-slate-800 bg-slate-50 dark:bg-slate-950/80">
                    <div className="flex items-center gap-3 min-w-0">
                      {aktiv
                        ? <CheckCircle size={18} className="text-emerald-500 flex-shrink-0" />
                        : tot
                          ? <AlertTriangle size={18} className="text-amber-500 flex-shrink-0" />
                          : <AlertCircle size={18} className="text-slate-400 flex-shrink-0" />}
                      <div className="min-w-0">
                        <span className="text-sm font-medium text-slate-900 dark:text-slate-200">{m.name}</span>
                        <span className="text-xs ml-2 font-mono text-slate-500 dark:text-slate-400">{m.source}</span>
                        <p className={`text-xs ${aktiv ? 'text-emerald-600 dark:text-emerald-400' : tot ? 'text-amber-600 dark:text-amber-400' : 'text-slate-500 dark:text-slate-400'}`}>
                          {aktiv ? 'aktiv & erreichbar' : tot ? 'verbunden, aber NICHT erreichbar (NAS aus/weg?)' : 'getrennt'}
                        </p>
                      </div>
                    </div>
                    <div className="flex items-center gap-1.5 flex-shrink-0">
                      {!aktiv && (
                        <Button variant="secondary" size="sm" onClick={() => reparieren(m.name)} disabled={busy} title="Neu verbinden (gespeicherte Zugangsdaten)">
                          <Wrench size={14} /> Reparieren
                        </Button>
                      )}
                      <button onClick={() => entfernen(m.name)} disabled={busy} className="p-1.5 rounded-lg text-rose-500 hover:bg-rose-500/10 transition-colors" title="Entfernen">
                        <Trash2 size={16} />
                      </button>
                    </div>
                  </div>
                )
              })}
            </div>
          </CardContent>
        </Card>
      )}

      {/* Ordner-Verwaltung */}
      <Card>
        <button
          onClick={() => setBrowserOffen(!browserOffen)}
          className="w-full flex items-center justify-between p-6 text-left transition-colors hover:bg-slate-50/50 dark:hover:bg-slate-800/30"
        >
          <div>
            <h3 className="text-sm font-semibold text-slate-900 dark:text-slate-100">
              Ordner-Verwaltung (optional)
            </h3>
            <p className="text-xs mt-0.5 text-slate-500 dark:text-slate-400">
              Unterordner in der Ablage anschauen und neue anlegen — z. B. „anime" oder „doku".
            </p>
          </div>
          <span className="text-xs flex-shrink-0 ml-3 text-amber-600 dark:text-amber-400 font-medium">
            {browserOffen ? 'zuklappen ▲' : 'aufklappen ▼'}
          </span>
        </button>

        {browserOffen && (
          <div className="border-t border-slate-200/80 dark:border-slate-800/80">
            <div className="flex items-center gap-2 px-4 py-2.5 bg-slate-50 dark:bg-slate-950/90 border-b border-slate-200/80 dark:border-slate-800">
              <button
                onClick={() => browseParent && browsen(browseParent)}
                disabled={!browseParent}
                className="p-1.5 rounded-lg disabled:opacity-30 hover:bg-slate-200 dark:hover:bg-slate-800 text-slate-500 dark:text-slate-400 transition-colors"
                title="Ordner hoch"
              >
                <ArrowUp size={16} />
              </button>
              <span className="text-xs font-mono truncate flex-1 text-slate-500 dark:text-slate-400">{browsePath}</span>
              <input
                value={neuerOrdner}
                onChange={e => setNeuerOrdner(e.target.value)}
                placeholder="neuer-ordner"
                className="w-36 px-2.5 py-1 text-xs border rounded-lg bg-white dark:bg-slate-900 border-slate-200 dark:border-slate-700 text-slate-900 dark:text-slate-100 focus:outline-none focus:ring-2 focus:ring-amber-500/50"
              />
              <button
                onClick={ordnerAnlegen}
                disabled={!neuerOrdner}
                className="p-1.5 rounded-lg disabled:opacity-30 text-amber-500 hover:bg-amber-500/10 transition-colors"
                title="Ordner anlegen"
              >
                <FolderPlus size={16} />
              </button>
            </div>
            <div className="max-h-44 overflow-y-auto p-2">
              {browseDirs.length === 0 && browseFiles.length === 0 ? (
                <p className="text-xs p-3 text-slate-400 dark:text-slate-500">Ordner ist leer</p>
              ) : (
                <>
                  {browseDirs.map(d => (
                    <button
                      key={d.path}
                      onClick={() => browsen(d.path)}
                      className="w-full flex items-center gap-2 px-3 py-2 text-sm rounded-lg text-left transition-colors text-slate-700 dark:text-slate-300 hover:bg-slate-100 dark:hover:bg-slate-800"
                    >
                      <Folder size={15} className="text-slate-400 dark:text-slate-500" />
                      {d.name}
                    </button>
                  ))}
                  {browseFiles.map(f => (
                    <div
                      key={f.name}
                      className="flex items-center gap-2 px-3 py-1.5 text-sm text-slate-400 dark:text-slate-500"
                    >
                      <File size={14} className="flex-shrink-0" />
                      <span className="truncate">{f.name}</span>
                      {f.size_mb != null && (
                        <span className="ml-auto text-xs flex-shrink-0 font-mono">
                          {f.size_mb >= 1024 ? `${(f.size_mb / 1024).toFixed(1)} GB` : `${f.size_mb} MB`}
                        </span>
                      )}
                    </div>
                  ))}
                </>
              )}
            </div>
          </div>
        )}
      </Card>

      {/* Neues Netzwerk-Ziel */}
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <Plus size={20} className="text-amber-500" />
            <span>Netzwerk-Ziel hinzufügen</span>
          </CardTitle>
        </CardHeader>
        <CardContent className="space-y-4">
          <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
            <Input
              label="Name (klein, ohne Leerzeichen)"
              value={name}
              onChange={e => setName(e.target.value.toLowerCase())}
              placeholder="nas-filme"
            />
            <Select
              label="Typ"
              value={typ}
              onChange={e => setTyp(e.target.value as 'nfs' | 'cifs')}
            >
              <option value="nfs">NFS (NAS/Linux)</option>
              <option value="cifs">SMB/CIFS (Windows-Freigabe, NAS)</option>
            </Select>

            {typ === 'nfs' ? (
              <div className="md:col-span-2">
                <Input
                  label="Quelle (host:/export/pfad)"
                  value={source}
                  onChange={e => setSource(e.target.value)}
                  placeholder="192.168.1.10:/volume1/filme"
                />
              </div>
            ) : (
              <>
                <div className="md:col-span-2">
                  <Input
                    label="Rechner (dein PC oder NAS — Name oder IP)"
                    value={host}
                    onChange={e => setHost(e.target.value)}
                    placeholder="z. B. 192.168.1.20 oder MEIN-NAS"
                  />
                </div>
                <Input
                  label="Benutzer"
                  value={username}
                  onChange={e => setUsername(e.target.value)}
                  autoComplete="off"
                  placeholder="Freigabe-Benutzer"
                />
                <Input
                  label="Passwort"
                  type="password"
                  value={password}
                  onChange={e => setPassword(e.target.value)}
                  autoComplete="new-password"
                />
                <p className="md:col-span-2 text-xs text-slate-500 dark:text-slate-400">
                  Windows-PCs und die meisten NAS verlangen Benutzer + Passwort — ohne Angaben versucht Rippy einen Gast-Zugriff.
                </p>
                <div className="md:col-span-2">
                  <Button
                    variant="secondary"
                    size="sm"
                    onClick={freigabenAuflisten}
                    disabled={!host || sharesBusy}
                  >
                    {sharesBusy ? 'Suche…' : 'Freigaben auflisten'}
                  </Button>
                </div>
                {shares.length > 0 && (
                  <div className="md:col-span-2">
                    <Select
                      label="Freigabe wählen"
                      value={selectedShare}
                      onChange={e => setSelectedShare(e.target.value)}
                    >
                      {shares.map(s => <option key={s} value={s}>{s}</option>)}
                    </Select>
                  </div>
                )}
              </>
            )}
          </div>

          <Button
            variant="amber"
            onClick={hinzufuegen}
            disabled={busy || !name || (typ === 'nfs' ? !source : !(host && selectedShare))}
          >
            {busy ? 'Hänge ein…' : 'Einhängen & speichern'}
          </Button>

          {feedback && (
            <p className={`text-sm flex items-center gap-2 font-medium ${feedback.startsWith('✓') ? 'text-emerald-500' : 'text-rose-500'}`}>
              {feedback.startsWith('✓') ? <CheckCircle size={16} /> : <AlertCircle size={16} />}
              {feedback}
            </p>
          )}
        </CardContent>
      </Card>
    </div>
  )
}