import { useMemo, useRef, useState } from "react"
import { AlertTriangle, RefreshCw, Search, Terminal } from "lucide-react"
import { cn } from "@/lib/utils"

// System-Log-Konsole (Paket D16c): färbt Fehler/Warnungen ein, filtert auf „nur Probleme"
// und durchsucht die Zeilen. Ersetzt den früheren monochromen <pre>-Dump („zu dünn").

type Level = "error" | "warn" | "info"

// Wortgrenzen-Regex, damit „error" nicht in jeder URL/jedem Pfad anschlägt. Deutsch + Englisch,
// weil unsere Dienste beides loggen (Hermes englisch, MC2/Voice teils deutsch).
const _ERR = /\b(error|fehler|fail(ed|ure)?|fatal|critical|crit|panic|traceback|exception|denied|refused|unable|emerg|alert|oom|killed)\b/i
const _WARN = /\b(warn(ing)?|deprecat\w*|retry(ing)?|timeout|timed out|degraded|missing|not found|nicht gefunden)\b/i

function classify(line: string): Level {
  if (_ERR.test(line)) return "error"
  if (_WARN.test(line)) return "warn"
  return "info"
}

const LEVEL_CLS: Record<Level, string> = {
  error: "text-red-400",
  warn: "text-amber-300",
  info: "text-cyan-300/80",
}

export function LogConsole({ service, text, loading, logStatus, onRefresh, onOpenSettings }: {
  service: string
  text: string
  loading: boolean
  logStatus: string | null
  onRefresh: () => void
  onOpenSettings: () => void
}) {
  const [problemsOnly, setProblemsOnly] = useState(false)
  const [query, setQuery] = useState("")
  const containerRef = useRef<HTMLDivElement | null>(null)

  const lines = useMemo(
    () => (text ? text.split("\n").map((t) => ({ t, level: classify(t) })) : []),
    [text],
  )
  const problemCount = useMemo(() => lines.filter((l) => l.level !== "info").length, [lines])

  const q = query.trim().toLowerCase()
  const shown = lines.filter(
    (l) => (!problemsOnly || l.level !== "info") && (!q || l.t.toLowerCase().includes(q)),
  )

  const needsPw = logStatus === "password_required" || logStatus === "incorrect_password"

  return (
    <div className="flex-1 flex flex-col min-h-[300px] border border-border/60 bg-black/50 rounded-xl overflow-hidden shadow-inner">
      {/* Konsolen-Kopf: Titel + Problem-Filter + Suche + Neu laden */}
      <div className="flex h-10 items-center justify-between gap-2 px-3 border-b border-border/40 bg-black/30 shrink-0">
        <div className="flex items-center gap-1.5 text-[10px] font-mono text-muted-foreground shrink-0">
          <Terminal className="h-3 w-3 text-primary" />
          <span className="hidden sm:inline">stdout/stderr —</span> {service}
        </div>
        <div className="flex items-center gap-1.5">
          <div className="relative">
            <Search className="pointer-events-none absolute left-2 top-1/2 h-3 w-3 -translate-y-1/2 text-muted-foreground" />
            <input
              value={query}
              onChange={(e) => setQuery(e.target.value)}
              placeholder="filtern…"
              className="h-7 w-24 sm:w-36 rounded-md border border-border/50 bg-background/40 pl-6 pr-2 text-[10px] text-foreground outline-none focus:border-primary/50"
            />
          </div>
          <button
            onClick={() => setProblemsOnly((v) => !v)}
            title="Nur Fehler und Warnungen zeigen"
            className={cn("flex h-7 items-center gap-1 rounded-md border px-2 text-[10px] font-semibold transition-colors",
              problemsOnly ? "border-amber-500/50 bg-amber-500/15 text-amber-300"
                : "border-border/50 bg-background/20 text-muted-foreground hover:text-foreground")}
          >
            <AlertTriangle className="h-3 w-3" />
            Nur Probleme{problemCount > 0 ? ` (${problemCount})` : ""}
          </button>
          <button onClick={onRefresh} disabled={loading} title="Neu laden"
            className="flex h-7 w-7 items-center justify-center rounded-md border border-border/50 bg-background/20 text-muted-foreground hover:text-foreground transition-colors disabled:opacity-50">
            <RefreshCw className={cn("h-3 w-3", loading && "animate-spin")} />
          </button>
        </div>
      </div>

      {/* Zeilen-Bereich */}
      <div ref={containerRef} className="flex-1 overflow-y-auto p-3 text-[10px] font-mono leading-relaxed scrollbar-thin select-text">
        {needsPw ? (
          <div className="flex h-full flex-col items-center justify-center space-y-3 p-6 text-center">
            <AlertTriangle className="h-8 w-8 text-amber-400 animate-pulse animate-duration-1000" />
            <div className="text-xs font-semibold text-amber-300">
              {logStatus === "incorrect_password" ? "Falsches Sudo-Passwort hinterlegt." : "Sudo-Passwort für systemd-Dienste erforderlich."}
            </div>
            <p className="max-w-xs text-[10px] leading-normal text-muted-foreground">
              Für das Auslesen der systemd-Logs von {service} werden Root-Rechte benötigt. Hinterlege dein Passwort in den Einstellungen.
            </p>
            <button onClick={onOpenSettings}
              className="mt-2 rounded-md bg-primary px-3 py-1.5 text-[10px] font-semibold text-primary-foreground transition-colors hover:bg-primary/95">
              Sudo-Passwort eintragen
            </button>
          </div>
        ) : loading && !text ? (
          <span className="text-muted-foreground">Lade Logs…</span>
        ) : lines.length === 0 ? (
          <span className="text-muted-foreground">Keine Logeinträge vorhanden.</span>
        ) : shown.length === 0 ? (
          <span className="text-muted-foreground">
            {problemsOnly ? "Keine Fehler oder Warnungen — der Dienst läuft sauber. ✓" : "Kein Treffer für den Filter."}
          </span>
        ) : (
          shown.map((l, i) => (
            <div key={i} className={cn("whitespace-pre-wrap", LEVEL_CLS[l.level])}>{l.t || " "}</div>
          ))
        )}
      </div>
    </div>
  )
}