import { useState } from "react"
import { Bot, ExternalLink, Activity, Cpu, Wrench, Monitor, Shield, Check, X } from "lucide-react"
import { api } from "@/lib/api"
import { useAgentStatus, useModels, useQueryClient, qk } from "@/lib/queries"
import { useDialog } from "@/lib/useDialog"
import { cn, resolveExternalUrl } from "@/lib/utils"

// Lane-/Gateway-Aliase, auf die das Hirn zeigen kann (Lane-Sprache statt altem „auto").
const ALIASES = ["chat", "coding", "fast", "heavy"]

export function AgentView() {
  const { data: s, error: sErr } = useAgentStatus()
  const { data: modelsData } = useModels()
  const { showAlert, dialogElement } = useDialog()
  const qc = useQueryClient()
  const error = sErr ? String(sErr) : ""
  const [showBrainSelect, setShowBrainSelect] = useState(false)

  const installed = modelsData?.models ?? []

  // Alias setzen → roher Config-Write (model.default zeigt aufs Alias).
  async function setBrainAlias(alias: string) {
    try {
      await api("/api/agent/brain", { method: "POST", body: JSON.stringify({ model: alias }) })
      showAlert("Erledigt", `Hermes-Hirn zeigt jetzt auf das Alias '${alias}'. Der Gateway-Dienst wurde neu gestartet.`)
      qc.invalidateQueries({ queryKey: qk.agentStatus })
      setShowBrainSelect(false)
    } catch (e: any) {
      showAlert("Fehler", `Wechsel fehlgeschlagen: ${e.message || e}`)
    }
  }

  // Installiertes Modell → warm-bewusst (hermes-Alias + brains-Gruppe + Config + Restart).
  async function setBrainWarm(modelName: string) {
    try {
      await api("/api/agent/brain/set", { method: "POST", body: JSON.stringify({ model_id: modelName }) })
      showAlert("Erledigt", "Agent-Hirn gewechselt (warm gehalten). Gateway wurde neugestartet.")
      qc.invalidateQueries({ queryKey: qk.agentStatus })
      qc.invalidateQueries({ queryKey: qk.models })
      setShowBrainSelect(false)
    } catch (e: any) {
      showAlert("Fehler", `Wechsel fehlgeschlagen: ${e.message || e}`)
    }
  }

  return (
    <div className="space-y-6">
      {/* Header */}
      <div className="flex flex-col sm:flex-row justify-between sm:items-center gap-4">
        <div>
          <h1 className="text-2xl font-space font-bold tracking-tight bg-gradient-to-r from-foreground via-foreground to-primary bg-clip-text text-transparent">
            Hermes Agenten-Cockpit
          </h1>
          <p className="text-sm text-muted-foreground">
            Hermes ist ein autonomer Agent, der im Hintergrund der Box läuft (Port <code>:8642</code>) und seine eigene UI besitzt.
          </p>
        </div>

        {s?.hermes_ui_url && (
          <a
            href={resolveExternalUrl(s.hermes_ui_url)}
            target="_blank"
            rel="noopener"
            className={cn(
              "flex h-9 px-4 items-center gap-1.5 text-xs font-semibold rounded-lg transition-all cursor-pointer shadow-md shrink-0 self-start",
              s.hermes_ui_reachable
                ? "bg-primary text-primary-foreground hover:opacity-90 shadow-primary/10"
                : "border border-border/60 text-muted-foreground bg-background/20"
            )}
          >
            <ExternalLink className="h-4 w-4" />
            <span>Hermes-GUI öffnen</span>
          </a>
        )}
      </div>

      {error && (
        <div className="rounded-xl border border-red-500/20 bg-red-500/5 p-4 text-xs text-red-400 font-mono">
          Status nicht lesbar ({error}).
        </div>
      )}

      {s && (
        <div className="space-y-6">
          {/* Agent-Fluss: Terminal → Gateway → Hirn / Verdrahtung / PC (ruhig, statt SVG-Graph) */}
          <div className="mc-card p-5">
            <div className="mb-4 flex items-center gap-2">
              <Bot className="h-4.5 w-4.5 text-primary" />
              <span className="text-xs font-bold uppercase tracking-wider text-foreground">Agent-Fluss</span>
            </div>

            <div className="flex flex-col lg:flex-row lg:items-stretch gap-3">
              {/* Quelle: Terminal/Clients */}
              <button
                onClick={() => s.hermes_ui_reachable && window.open(resolveExternalUrl(s.hermes_ui_url), "_blank")}
                title={s.hermes_ui_reachable ? "Hermes-GUI öffnen" : "Desktop-Gateway offline"}
                className="lg:w-40 shrink-0 rounded-xl border border-border/60 bg-background/30 p-3 text-left hover:border-primary/40 transition-all cursor-pointer flex flex-col justify-center"
              >
                <div className="flex items-center gap-1.5">
                  <Activity className={cn("h-3.5 w-3.5", s.hermes_ui_reachable ? "text-emerald-400" : "text-amber-500")} />
                  <span className="text-xs font-semibold text-foreground">Desktop &amp; GUI</span>
                  <span className={cn("ml-auto h-1.5 w-1.5 rounded-full animate-pulse", s.hermes_ui_reachable ? "bg-emerald-500" : "bg-amber-500")} />
                </div>
                <span className="text-[10px] text-muted-foreground font-mono mt-0.5">Hermes Desktop · Clients</span>
              </button>

              <div className="hidden lg:flex items-center text-muted-foreground text-lg select-none">→</div>

              {/* Gateway + nachgelagerte Module */}
              <div className="flex-1 flex flex-col gap-2.5">
                {/* Agent Gateway */}
                <div className="rounded-xl border border-primary/40 bg-primary/5 px-3.5 py-2.5 flex items-center gap-2">
                  <Bot className="h-3.5 w-3.5 text-primary" />
                  <span className="text-xs font-semibold text-primary">Agent Gateway</span>
                  <span className="text-[11px] font-mono text-muted-foreground">:8642</span>
                  <span className={cn(
                    "ml-auto inline-flex items-center gap-1.5 text-[10px] font-bold uppercase font-mono px-2 py-0.5 rounded-full border",
                    s.gateway_reachable
                      ? "bg-emerald-500/10 text-emerald-400 border-emerald-500/20"
                      : "bg-red-500/10 text-red-400 border-red-500/20"
                  )}>
                    <span className={cn("h-1.5 w-1.5 rounded-full", s.gateway_reachable ? "bg-emerald-500 animate-pulse" : "bg-red-500")} />
                    {s.gateway_reachable ? "online" : "offline"}
                  </span>
                </div>

                {/* Drei Module: Hirn (klickbar), Verdrahtung, PC */}
                <div className="grid gap-2.5 sm:grid-cols-3">
                  <button
                    onClick={() => setShowBrainSelect(true)}
                    className="rounded-xl border border-border/60 bg-background/30 p-3 text-left hover:border-primary/45 transition-all cursor-pointer"
                  >
                    <div className="flex items-center gap-1.5 text-muted-foreground">
                      <Cpu className="h-3.5 w-3.5 text-primary" />
                      <span className="text-[10px] font-bold uppercase tracking-wider">Hirn</span>
                      <span className="ml-auto text-[9px] text-primary/70 font-bold uppercase">wechseln →</span>
                    </div>
                    <div className="text-[11px] font-mono font-medium text-foreground truncate mt-1" title={s.brain_model}>
                      {s.brain_model || "chat"}
                    </div>
                  </button>

                  <div className="rounded-xl border border-border/60 bg-background/30 p-3">
                    <div className="flex items-center gap-1.5 text-muted-foreground">
                      <Wrench className="h-3.5 w-3.5 text-primary" />
                      <span className="text-[10px] font-bold uppercase tracking-wider">Verdrahtung</span>
                    </div>
                    <div className="text-[10px] font-mono mt-1 flex flex-wrap gap-x-2 text-muted-foreground">
                      <span>Config: {s.has_config ? "✓" : "—"}</span>
                      <span>Skills: {s.has_skills ? "✓" : "—"}</span>
                      <span>Memory: {s.has_memories ? "✓" : "—"}</span>
                    </div>
                  </div>

                  <div className="rounded-xl border border-border/60 bg-background/30 p-3">
                    <div className="flex items-center gap-1.5 text-muted-foreground">
                      <Monitor className="h-3.5 w-3.5 text-primary" />
                      <span className="text-[10px] font-bold uppercase tracking-wider">PC</span>
                      <span className={cn("ml-auto h-1.5 w-1.5 rounded-full", s.pc_executor_reachable ? "bg-emerald-500 animate-pulse" : "bg-amber-500")} />
                    </div>
                    <div className={cn("text-[11px] font-mono mt-1", s.pc_executor_reachable ? "text-emerald-400" : "text-muted-foreground")}>
                      :7777 {s.pc_executor_reachable ? "verbunden" : "offline"}
                    </div>
                  </div>
                </div>
              </div>
            </div>
          </div>

          {/* PC Executor Status Card */}
          <div className="mc-card p-6 space-y-4">
            <div className="flex items-center justify-between">
              <div className="flex items-center gap-2">
                <Monitor className="h-5 w-5 text-primary" />
                <h3 className="text-sm font-bold uppercase tracking-wider text-foreground">PC Verbindung</h3>
              </div>
              <div className="flex items-center gap-2">
                <span className={cn("h-2 w-2 rounded-full", s.pc_executor_reachable ? "bg-emerald-500 animate-pulse" : "bg-amber-500")} />
                <span className="text-xs font-semibold text-foreground">
                  {s.pc_executor_reachable ? "Erreichbar" : "Nicht verbunden"}
                </span>
              </div>
            </div>

            <div className="grid gap-6 md:grid-cols-2 text-xs text-muted-foreground leading-relaxed text-left">
              <div className="space-y-3">
                <p>
                  Der <strong className="text-foreground">Hermes PC Executor</strong> läuft auf <code className="text-foreground font-mono px-1 py-0.5 rounded bg-muted/40 border border-border/30">192.168.178.98:7777</code> und ermöglicht Hermes den direkten Zugriff auf deinen Windows-PC — Shell-Befehle, Screenshots, Tastatureingaben.
                </p>
                <p>
                  Hermes erreicht den PC über den MCP-Server <code className="text-foreground font-mono px-1 py-0.5 rounded bg-muted/40 border border-border/30">hermes-pc-control</code>, der automatisch beim Gateway-Start verbunden wird.
                </p>
              </div>

              <div className="space-y-3">
                {s.pc_executor_reachable ? (
                  <div className="p-3.5 bg-emerald-500/5 border border-emerald-500/20 rounded-xl space-y-1">
                    <div className="text-emerald-400 font-semibold text-xs flex items-center gap-1.5">
                      <span className="h-1.5 w-1.5 rounded-full bg-emerald-500 animate-pulse" />
                      PC Executor verbunden
                    </div>
                    <p className="text-[10px]">
                      Hermes kann jetzt per Telegram oder Terminal Befehle auf TobisNicerPC ausführen. Nutze <code className="text-foreground">pc_shell</code>, <code className="text-foreground">pc_screenshot</code> oder <code className="text-foreground">pc_open</code>.
                    </p>
                  </div>
                ) : (
                  <div className="space-y-2">
                    <h4 className="text-xs font-bold text-foreground">PC Executor starten</h4>
                    <p>Starte <code className="text-foreground font-mono">start.bat</code> im Ordner <code className="text-foreground font-mono">client\hermes-pc\</code> auf dem Windows-PC und lasse das Fenster offen.</p>
                    <div className="p-3 bg-background/25 rounded-xl border border-border/30 font-mono text-[9px] text-cyan-300">
                      client\hermes-pc\start.bat
                    </div>
                  </div>
                )}
              </div>
            </div>
          </div>

          {/* Diagnostic Details if Offline */}
          {!s.gateway_reachable && (
            <div className="mc-card p-6 space-y-4 text-left">
              <div className="flex items-center gap-2">
                <Shield className="h-5 w-5 text-amber-500" />
                <h3 className="text-sm font-bold uppercase tracking-wider text-foreground">Hermes-Agent Diagnostics</h3>
              </div>

              <div className="text-xs text-muted-foreground space-y-3 leading-relaxed">
                <p>
                  Der Hermes-Dienst ist auf der Box derzeit offline oder kann sich nicht mit dem lokalen llama-swap verbinden.
                </p>
                <p>
                  Stelle sicher, dass die systemd-Dienste auf der Box laufen. Du kannst den Status im <strong>OS &amp; Updates Drawer</strong> prüfen und die Dienste bei Bedarf neu starten.
                </p>

                <div className="p-3.5 bg-background/25 rounded-xl border border-border/30 font-mono text-[10px] space-y-1">
                  <div className="text-muted-foreground/60"># Dienste manuell auf der Box prüfen:</div>
                  <div className="text-primary">systemctl --user status hermes-gateway</div>
                  <div className="text-primary">systemctl --user status hermes-builtin-ui</div>
                </div>

                <p>
                  Weitere Einrichtungsdetails (Brain-Konfiguration, MCP-Kopplungen, SSH-Tunneling und Such-Engines) findest du in der Dokumentationsdatei:
                  <code className="ml-1 px-1.5 py-0.5 rounded bg-muted/40 text-foreground border border-border/30">docs/HERMES_SETUP.md</code>.
                </p>
              </div>
            </div>
          )}
        </div>
      )}

      {/* Brain Selection Modal — eine Stelle für den Hirn-Wechsel (warm-bewusst + Alias) */}
      {s && showBrainSelect && (
        <div className="fixed inset-0 z-50 bg-black/60 backdrop-blur-sm flex items-center justify-center p-4 overscroll-contain" role="dialog" aria-modal="true" aria-label="Hermes-Hirn konfigurieren">
          <div className="w-full max-w-md rounded-2xl border border-border/80 bg-card p-6 shadow-2xl space-y-4 animate-in fade-in zoom-in-95 duration-200">
            <div className="flex items-center justify-between border-b border-border/20 pb-2">
              <h3 className="text-xs font-bold uppercase tracking-wider text-primary flex items-center gap-1.5">
                <Cpu className="h-4 w-4" />
                <span>Hermes-Hirn konfigurieren</span>
              </h3>
              <button
                onClick={() => setShowBrainSelect(false)}
                className="p-1 rounded hover:bg-accent text-muted-foreground hover:text-foreground cursor-pointer"
              >
                <X className="h-4 w-4" />
              </button>
            </div>

            {/* Lane / Gateway-Alias */}
            <div className="space-y-1.5">
              <div className="text-[10px] font-bold uppercase tracking-wider text-muted-foreground">Lane / Gateway-Alias</div>
              <div className="flex flex-wrap gap-1.5">
                {ALIASES.map((a) => {
                  const cur = s.brain_model === a
                  return (
                    <button
                      key={a}
                      onClick={() => setBrainAlias(a)}
                      className={cn(
                        "px-3 py-1.5 rounded-lg text-xs font-mono font-semibold border transition-all cursor-pointer flex items-center gap-1.5",
                        cur ? "border-primary/40 bg-primary/10 text-primary" : "border-border/30 bg-background/20 text-foreground hover:bg-accent",
                      )}
                    >
                      {a}{cur && <Check className="h-3.5 w-3.5" />}
                    </button>
                  )
                })}
              </div>
              <p className="text-[10px] text-muted-foreground/70">
                Schlank &amp; flexibel: das Hirn folgt dem Lane-Routing (z.B. <code className="text-primary">chat</code> = fast↔heavy).
              </p>
            </div>

            {/* Installierte Modelle (warm-bewusst) */}
            <div className="space-y-1.5">
              <div className="text-[10px] font-bold uppercase tracking-wider text-muted-foreground">Installiertes Modell (warm gehalten)</div>
              <div className="space-y-1.5 max-h-56 overflow-y-auto pr-1">
                {installed.map((m) => {
                  const isBrain = m.role === "hermes"
                  return (
                    <button
                      key={m.name}
                      onClick={() => !isBrain && setBrainWarm(m.name)}
                      disabled={isBrain || m.incomplete}
                      className={cn(
                        "w-full text-left px-3 py-2.5 rounded-lg text-xs flex items-center justify-between font-mono border transition-all",
                        isBrain ? "border-indigo-500/40 bg-indigo-500/10 text-indigo-300"
                          : m.incomplete ? "border-border/20 bg-background/10 text-muted-foreground/50 cursor-not-allowed"
                          : "border-border/30 bg-background/20 text-foreground hover:bg-accent cursor-pointer"
                      )}
                    >
                      <div className="flex flex-col min-w-0">
                        <span className="font-semibold truncate max-w-[280px]">{m.name.split("/").pop()?.replace(/\.gguf$/i, "")}</span>
                        <span className="text-[9px] text-muted-foreground mt-0.5">
                          {m.capabilities.params_b ? `${m.capabilities.params_b}B` : "?"} · {m.capabilities.tools !== "no" ? "Tools ✓" : "ohne Tools"}
                          {m.role && ` · Rolle: ${m.role}`}
                        </span>
                      </div>
                      {isBrain
                        ? <span className="text-[9px] font-bold uppercase text-indigo-300 shrink-0 flex items-center gap-1"><Check className="h-3.5 w-3.5" /> Aktiv</span>
                        : <span className="text-[9px] font-bold uppercase text-primary/70 shrink-0">Warm setzen →</span>}
                    </button>
                  )
                })}
              </div>
            </div>

            <div className="text-[10px] text-amber-400/80 flex items-start gap-1.5 border-t border-border/20 pt-2.5">
              <span>💡</span>
              <span>Für einen <strong>Agenten</strong> sind Hermes-Modelle (natives Tool-Calling) meist die robustere Wahl. Neues Modell? Erst über „Modell-Manager → Modelle finden" laden.</span>
            </div>
          </div>
        </div>
      )}

      {dialogElement}
    </div>
  )
}
