import { useEffect, useMemo, useRef, useState } from "react";
import {
  getModelLibraryState,
  pickRuntimeModelFiles,
  pickRuntimeModelsDir,
  queryRuntimeGpu,
  scanRuntimeModels,
  searchHuggingFaceModels,
} from "../api";
import {
  chooseModel,
  createRuntimeConfigPatch,
  dedupeModels,
  getLocalRuntimeStartReason,
  pathName,
  resolveDraftModelSelection,
  toModelFile,
} from "../runtime-settings-form";
import {
  createRuntimeDraftFieldState,
  type ModelLibraryState,
  type HuggingFaceModelResult,
  type RuntimeConfig,
  type RuntimeDraftFieldKey,
  type RuntimeDraftFieldMeta,
  type RuntimeDraftFieldState,
  type RuntimeGpuInfo,
  type RuntimeLifecycleResult,
  type RuntimeModelFile,
  type RuntimeSnapshot,
} from "../types";
import "./RuntimeSettingsDrawer.css";

const CTX_PRESETS = [2048, 4096, 8192, 16384, 32768, 65536];
const REMOTE_PRESET_TEMPLATES = [
  { id: "openai", label: "OpenAI", provider: "open_ai", baseUrl: "https://api.openai.com/v1" },
  { id: "openrouter", label: "OpenRouter", provider: "open_router", baseUrl: "https://openrouter.ai/api/v1" },
  { id: "anthropic", label: "Anthropic", provider: "anthropic", baseUrl: "https://api.anthropic.com/v1" },
] as const;

interface Props {
  open: boolean;
  snapshot: RuntimeSnapshot;
  busy: boolean;
  activeLifecycleCommand?: RuntimeSnapshot["active_command"];
  lastLifecycleResult?: RuntimeLifecycleResult;
  lifecycleBusy?: boolean;
  applyImpact?: "immediate" | "restart_required" | "save_before_apply";
  onClose: () => void;
  onSave: (patch: Partial<RuntimeConfig>) => Promise<RuntimeSnapshot>;
  onStart: () => Promise<unknown>;
  onStop: () => Promise<unknown>;
  draftConfig?: RuntimeConfig;
  savedBaseline?: RuntimeConfig;
  draftDirty?: boolean;
  draftFields?: RuntimeDraftFieldState;
  onUpdateDraft?: (patch: Partial<RuntimeConfig>) => void;
  onUpdateDraftFieldMeta?: (field: RuntimeDraftFieldKey, patch: Partial<RuntimeDraftFieldMeta>) => void;
  onResetDraft?: () => void;
}

function valuesEqual(left: unknown, right: unknown): boolean {
  return JSON.stringify(left) === JSON.stringify(right);
}

function maskSecret(value: string): string {
  if (!value.trim()) return "Not configured";
  return `${"*".repeat(Math.max(4, Math.min(12, value.trim().length)))} (${value.trim().length} chars)`;
}

function formatReferenceValue(field: keyof RuntimeConfig, value: RuntimeConfig[keyof RuntimeConfig]): string {
  switch (field) {
    case "connection_mode":
      return value === "remote" ? "Remote API" : "Local API";
    case "start_policy":
      return value === "on_app_launch" ? "Start on app launch" : "Start manually";
    case "server_url":
      return String(value || "Not configured");
    case "api_key":
      return maskSecret(String(value || ""));
    case "model_path":
      return value ? pathName(String(value)) : "No model selected";
    case "models_dir":
      return String(value || "No folder selected");
    case "addr":
      return `http://${String(value || "127.0.0.1:8080")}`;
    case "gpu_layers":
      return `${String(value)} GPU layers`;
    case "ctx_size":
      return `${String(value)} context tokens`;
    case "selected_model_id":
      return String(value || "No managed model selected");
    case "hugging_face_token":
      return maskSecret(String(value || ""));
    default:
      return Array.isArray(value) ? `${value.length} configured` : String(value || "-");
  }
}

export default function RuntimeSettingsDrawer({
  open,
  snapshot,
  busy,
  activeLifecycleCommand = snapshot.active_command,
  lastLifecycleResult = snapshot.last_command_result,
  lifecycleBusy = false,
  applyImpact = "immediate",
  onClose,
  onSave,
  onStart,
  onStop,
  draftConfig: controlledDraftConfig,
  savedBaseline: controlledSavedBaseline,
  draftDirty: controlledDraftDirty,
  draftFields: controlledDraftFields,
  onUpdateDraft,
  onUpdateDraftFieldMeta,
  onResetDraft,
}: Props) {
  const draftConfig = controlledDraftConfig ?? snapshot.config;
  const savedBaseline = controlledSavedBaseline ?? snapshot.config;
  const draftFields = controlledDraftFields ?? createRuntimeDraftFieldState();
  const draftDirty = controlledDraftDirty ?? !valuesEqual(draftConfig, savedBaseline);
  const draftConfigRef = useRef(draftConfig);
  const requestIdsRef = useRef<Record<string, number>>({});
  const [scannedModels, setScannedModels] = useState<RuntimeModelFile[]>([]);
  const [gpuInfo, setGpuInfo] = useState<RuntimeGpuInfo | null>(null);
  const [gpuError, setGpuError] = useState("");
  const [localError, setLocalError] = useState("");
  const [scanning, setScanning] = useState(false);
  const [hfQuery, setHfQuery] = useState("");
  const [hfResults, setHfResults] = useState<HuggingFaceModelResult[]>([]);
  const [hfLoading, setHfLoading] = useState(false);
  const [libraryState, setLibraryState] = useState<ModelLibraryState>({ entries: [], managed_dir: "" });
  const [confirmDiscard, setConfirmDiscard] = useState(false);

  useEffect(() => {
    draftConfigRef.current = draftConfig;
  }, [draftConfig]);

  const updateDraft = (patch: Partial<RuntimeConfig>) => {
    onUpdateDraft?.(patch);
  };

  const updateDraftFieldMeta = (field: RuntimeDraftFieldKey, patch: Partial<RuntimeDraftFieldMeta>) => {
    onUpdateDraftFieldMeta?.(field, patch);
  };

  const beginRequest = (key: string) => {
    const nextId = (requestIdsRef.current[key] ?? 0) + 1;
    requestIdsRef.current[key] = nextId;
    return nextId;
  };

  const isLatestRequest = (key: string, requestId: number) => requestIdsRef.current[key] === requestId;

  const extraModels = useMemo(
    () => draftConfig.extra_model_paths.map(toModelFile),
    [draftConfig.extra_model_paths],
  );

  const allModels = useMemo(() => {
    const merged = dedupeModels([...scannedModels, ...extraModels]);
    if (draftConfig.model_path && !merged.some((model) => model.path === draftConfig.model_path)) {
      return [toModelFile(draftConfig.model_path), ...merged];
    }
    return merged;
  }, [draftConfig.model_path, extraModels, scannedModels]);

  const dirtyFieldCount = useMemo(() => {
    const trackedFields: Array<keyof RuntimeConfig> = [
      "connection_mode",
      "server_url",
      "api_key",
      "models_dir",
      "model_path",
      "addr",
      "ctx_size",
      "gpu_layers",
      "start_policy",
      "hugging_face_token",
    ];
    return trackedFields.filter((field) => !valuesEqual(draftConfig[field], savedBaseline[field])).length;
  }, [draftConfig, savedBaseline]);

  const hasInvalidDraft = Object.values(draftFields).some((meta) => meta?.invalid);
  const hasPendingDraft = Object.values(draftFields).some((meta) => meta?.pending);
  const hasBlockingDraftState = hasInvalidDraft || hasPendingDraft;
  const hasPendingModeChange = draftConfig.connection_mode !== savedBaseline.connection_mode;
  const restartRequiredWhileRunning =
    draftDirty && draftConfig.connection_mode === "local" && snapshot.process_running && applyImpact === "restart_required";
  const maxLayers = gpuInfo?.recommended_layers ?? 200;
  const startReason = getLocalRuntimeStartReason({
    mode: draftConfig.connection_mode,
    binaryPath: snapshot.binary_path,
    selectedModel: draftConfig.model_path || "",
  });

  const isFieldDirty = (field: keyof RuntimeConfig) => !valuesEqual(draftConfig[field], savedBaseline[field]);
  const fieldMeta = (field: RuntimeDraftFieldKey) => draftFields[field] ?? { invalid: false, pending: false, message: null };
  const showLifecycleResult = lastLifecycleResult.command !== "idle" && !lifecycleBusy;
  const applyGuidance = !draftDirty || draftConfig.connection_mode !== "local"
    ? null
    : hasPendingModeChange || applyImpact === "save_before_apply"
      ? "Stop the local API or save first before applying this change."
      : applyImpact === "restart_required"
        ? "Restart required to apply saved changes."
        : "Applies immediately after save.";
  const saveLabel = activeLifecycleCommand === "save" ? "Saving changes..." : "Save changes";
  const tertiaryLabel = hasPendingModeChange
    ? "Save mode before applying"
    : activeLifecycleCommand === "start"
      ? "Starting local API..."
      : activeLifecycleCommand === "stop"
        ? "Stopping local API..."
        : restartRequiredWhileRunning
          ? "Restart required to apply saved changes"
          : snapshot.process_running
            ? "Stop local API"
            : "Save and start local API";

  const renderFieldState = (field: RuntimeDraftFieldKey) => {
    const meta = fieldMeta(field);
    const dirty = isFieldDirty(field);

    if (!dirty && !meta.invalid && !meta.pending) {
      return null;
    }

    return (
      <div className={`runtime-field-state${dirty ? " is-draft" : ""}${meta.invalid ? " is-invalid" : ""}`}>
        <div className="runtime-field-state-row">
          {dirty && <span className="runtime-field-badge">Draft</span>}
          {meta.invalid && <span className="runtime-field-badge runtime-field-badge-danger">Invalid</span>}
          {meta.pending && <span className="runtime-field-badge runtime-field-badge-pending">Pending</span>}
          {dirty && (
            <>
              <span className="runtime-field-state-label">Live now</span>
              <span className="runtime-field-state-value">{formatReferenceValue(field, savedBaseline[field])}</span>
            </>
          )}
        </div>
        {meta.message && <div className="runtime-field-error-text">{meta.message}</div>}
      </div>
    );
  };

  const applyResolvedModelState = (models: RuntimeModelFile[]) => {
    const currentDraft = draftConfigRef.current;
    const resolved = resolveDraftModelSelection(currentDraft.model_path || "", models, currentDraft.extra_model_paths.map(toModelFile));
    updateDraft({
      model_path: resolved.nextModel || null,
      selected_model_id:
        resolved.invalid || resolved.nextModel === currentDraft.model_path
          ? currentDraft.selected_model_id
          : null,
    });
    updateDraftFieldMeta("model_path", {
      invalid: resolved.invalid,
      pending: false,
      message: resolved.message,
    });
  };

  const loadModelLibrary = async () => {
    const requestId = beginRequest("library");
    try {
      const state = await getModelLibraryState();
      if (!isLatestRequest("library", requestId)) return;
      setLibraryState(state);
    } catch (error) {
      if (!isLatestRequest("library", requestId)) return;
      setLocalError(String(error));
    }
  };

  const loadGpuInfo = async () => {
    const requestId = beginRequest("gpu");
    try {
      const info = await queryRuntimeGpu();
      if (!isLatestRequest("gpu", requestId)) return;
      setGpuInfo(info);
      setGpuError("");
      if (info && draftConfigRef.current.gpu_layers === 0) {
        updateDraft({ gpu_layers: info.recommended_layers });
      }
    } catch (error) {
      if (!isLatestRequest("gpu", requestId)) return;
      setGpuError(String(error));
    }
  };

  const handleRescan = async (dir = draftConfigRef.current.models_dir || "") => {
    if (!dir.trim()) return;
    const requestId = beginRequest("model-selection");
    setScanning(true);
    setLocalError("");
    updateDraftFieldMeta("models_dir", { pending: true, invalid: false, message: null });
    updateDraftFieldMeta("model_path", { pending: true });
    try {
      const models = await scanRuntimeModels(dir.trim());
      if (!isLatestRequest("model-selection", requestId)) return;
      setScannedModels(models);
      applyResolvedModelState(models);
      updateDraftFieldMeta("models_dir", { pending: false, invalid: false, message: null });
    } catch (error) {
      if (!isLatestRequest("model-selection", requestId)) return;
      setLocalError(String(error));
      setScannedModels([]);
      updateDraftFieldMeta("models_dir", { pending: false });
      updateDraftFieldMeta("model_path", { pending: false });
    } finally {
      if (isLatestRequest("model-selection", requestId)) {
        setScanning(false);
      }
    }
  };

  const handlePickDir = async () => {
    const requestId = beginRequest("model-selection");
    setLocalError("");
    updateDraftFieldMeta("models_dir", { pending: true, invalid: false, message: null });
    updateDraftFieldMeta("model_path", { pending: true });
    try {
      const result = await pickRuntimeModelsDir();
      if (!isLatestRequest("model-selection", requestId) || !result) return;
      updateDraft({ models_dir: result.dir });
      setScannedModels(result.models);
      applyResolvedModelState(result.models);
      updateDraftFieldMeta("models_dir", { pending: false, invalid: false, message: null });
    } catch (error) {
      if (!isLatestRequest("model-selection", requestId)) return;
      setLocalError(String(error));
      updateDraftFieldMeta("models_dir", { pending: false });
      updateDraftFieldMeta("model_path", { pending: false });
    }
  };

  const handlePickFiles = async () => {
    const requestId = beginRequest("model-selection");
    setLocalError("");
    updateDraftFieldMeta("model_path", { pending: true });
    try {
      const picked = await pickRuntimeModelFiles();
      if (!isLatestRequest("model-selection", requestId) || picked.length === 0) {
        updateDraftFieldMeta("model_path", { pending: false });
        return;
      }

      const currentDraft = draftConfigRef.current;
      const nextExtra = dedupeModels([...currentDraft.extra_model_paths.map(toModelFile), ...picked]);
      const nextModel = currentDraft.model_path || nextExtra[0]?.path || "";
      updateDraft({
        extra_model_paths: nextExtra.map((model) => model.path),
        model_path: nextModel || null,
        selected_model_id: currentDraft.model_path ? currentDraft.selected_model_id : null,
      });
      updateDraftFieldMeta("model_path", { pending: false, invalid: false, message: null });
    } catch (error) {
      if (!isLatestRequest("model-selection", requestId)) return;
      setLocalError(String(error));
      updateDraftFieldMeta("model_path", { pending: false });
    }
  };

  const handleHubSearch = async () => {
    if (!hfQuery.trim()) {
      setHfResults([]);
      return;
    }

    const requestId = beginRequest("hf-search");
    setLocalError("");
    setHfLoading(true);
    try {
      const results = await searchHuggingFaceModels(hfQuery.trim(), draftConfig.hugging_face_token.trim());
      if (!isLatestRequest("hf-search", requestId)) return;
      setHfResults(results);
    } catch (error) {
      if (!isLatestRequest("hf-search", requestId)) return;
      setLocalError(String(error));
      setHfResults([]);
    } finally {
      if (isLatestRequest("hf-search", requestId)) {
        setHfLoading(false);
      }
    }
  };

  const handleSave = async () => {
    setLocalError("");
    try {
      await onSave(buildPatch());
      setConfirmDiscard(false);
    } catch (error) {
      setLocalError(String(error));
    }
  };

  const handleSaveAndStart = async () => {
    setLocalError("");

    if (snapshot.process_running) {
      try {
        await onStop();
      } catch (error) {
        setLocalError(String(error));
      }
      return;
    }

    try {
      const next = await onSave(buildPatch());
      if (next.config.connection_mode !== "local") return;
      if (!next.config.model_path?.trim()) return;
      if (next.last_error?.code === "restart_required") return;
      await onStart();
    } catch (error) {
      setLocalError(String(error));
    }
  };

  useEffect(() => {
    if (!open) return;
    setConfirmDiscard(false);
    setLocalError("");
    setHfResults([]);
    void loadModelLibrary();
    void loadGpuInfo();
    if (draftConfig.connection_mode === "local" && draftConfig.models_dir?.trim()) {
      void handleRescan(draftConfig.models_dir);
    }
  }, [open]);

  if (!open) return null;

  const buildPatch = (): RuntimeConfig => ({
    ...createRuntimeConfigPatch(
      savedBaseline,
      {
        mode: draftConfig.connection_mode,
        startPolicy: draftConfig.start_policy,
        serverUrl: draftConfig.server_url,
        apiKey: draftConfig.api_key,
        modelsDir: draftConfig.models_dir || "",
        selectedModel: draftConfig.model_path || "",
        selectedModelId: draftConfig.selected_model_id,
        addr: draftConfig.addr,
        gpuLayers: draftConfig.gpu_layers,
        ctxSize: draftConfig.ctx_size,
        extraModels,
      },
      maxLayers,
    ),
    hugging_face_token: draftConfig.hugging_face_token.trim(),
    remote_presets: draftConfig.remote_presets?.length
      ? draftConfig.remote_presets
      : REMOTE_PRESET_TEMPLATES.map((preset) => ({
          id: preset.id,
          label: preset.label,
          provider: preset.provider,
          base_url: preset.baseUrl,
          default_model: "",
        })),
  });

  return (
    <div className="runtime-drawer-shell" role="dialog" aria-modal="true" aria-label="Draft settings">
      <button
        className="runtime-drawer-backdrop"
        onClick={() => {
          setConfirmDiscard(false);
          onClose();
        }}
        aria-label="Close runtime settings"
      />
      <aside className="runtime-drawer">
        <div className="runtime-drawer-header runtime-drawer-header-sticky">
          <div>
            <div className="runtime-drawer-kicker">Draft settings</div>
            <h2>Draft settings</h2>
            <div className="runtime-drawer-summary-row">
              <span className={`runtime-drawer-summary-badge${draftDirty ? " is-dirty" : ""}`}>
                {draftDirty ? `${dirtyFieldCount} unsaved ${dirtyFieldCount === 1 ? "change" : "changes"}` : "No draft changes yet"}
              </span>
              <span className="runtime-live-chip">Live now</span>
              <span className="runtime-live-chip-value">
                {snapshot.status === "ready"
                  ? "Local API ready"
                  : snapshot.config.connection_mode === "remote"
                    ? "Remote API mode"
                    : "Local API setup"}
              </span>
            </div>
            <p className="runtime-drawer-copy">
              Edit runtime settings as a draft. Close keeps this draft in-session until you save or discard it.
            </p>
          </div>
          <button
            className="runtime-drawer-close"
            onClick={() => {
              setConfirmDiscard(false);
              onClose();
            }}
            type="button"
            aria-label="Close runtime settings"
          >
            ×
          </button>
        </div>

        <div className="runtime-drawer-body">
          <section className="runtime-overview-card">
            <div>
              <div className="runtime-overview-label">Current status</div>
              <div className="runtime-overview-value">
                {snapshot.status === "ready"
                  ? "Local API ready"
                  : snapshot.config.connection_mode === "remote"
                    ? "Remote API mode"
                    : "Local API setup"}
              </div>
            </div>
            <div>
              <div className="runtime-overview-label">Endpoint</div>
              <div className="runtime-overview-value runtime-overview-mono">
                {snapshot.config.connection_mode === "remote"
                  ? snapshot.config.server_url || "Not configured"
                  : `http://${snapshot.config.addr}`}
              </div>
            </div>
            <div>
              <div className="runtime-overview-label">Saved model</div>
              <div className="runtime-overview-value">
                {savedBaseline.model_path ? pathName(savedBaseline.model_path) : "No model saved"}
              </div>
            </div>
          </section>

          <section className="runtime-drawer-section">
            <div className="runtime-drawer-section-title">Connection mode</div>
            <div className="runtime-segmented" role="tablist" aria-label="Connection mode">
              <button
                className={`runtime-segmented-btn${draftConfig.connection_mode === "local" ? " active" : ""}${isFieldDirty("connection_mode") ? " is-draft" : ""}`}
                onClick={() => updateDraft({ connection_mode: "local" })}
                type="button"
              >
                Local API
              </button>
              <button
                className={`runtime-segmented-btn${draftConfig.connection_mode === "remote" ? " active" : ""}${isFieldDirty("connection_mode") ? " is-draft" : ""}`}
                onClick={() => updateDraft({ connection_mode: "remote" })}
                type="button"
              >
                Remote API
              </button>
            </div>
            {isFieldDirty("connection_mode") && (
              <div className="runtime-field-state is-draft">
                <div className="runtime-field-state-row">
                  <span className="runtime-field-badge">Draft</span>
                  <span className="runtime-field-state-label">Live now</span>
                  <span className="runtime-field-state-value">
                    {formatReferenceValue("connection_mode", savedBaseline.connection_mode)}
                  </span>
                </div>
              </div>
            )}
          </section>

          {draftConfig.connection_mode === "remote" ? (
            <section className="runtime-drawer-section runtime-section-card">
              <div className="runtime-field-label">Provider presets</div>
              <div className="runtime-preset-row runtime-preset-row-first">
                {REMOTE_PRESET_TEMPLATES.map((preset) => (
                  <button
                    key={preset.id}
                    className={`runtime-preset${draftConfig.server_url.trim() === preset.baseUrl ? " active" : ""}`}
                    onClick={() => updateDraft({ server_url: preset.baseUrl })}
                    type="button"
                  >
                    {preset.label}
                  </button>
                ))}
              </div>

              <label className="runtime-field-label" htmlFor="runtime-remote-url">Remote server URL</label>
              <input
                id="runtime-remote-url"
                className={`runtime-field-input${isFieldDirty("server_url") ? " is-draft" : ""}${fieldMeta("server_url").invalid ? " is-invalid" : ""}`}
                value={draftConfig.server_url}
                onChange={(event) => updateDraft({ server_url: event.target.value })}
                placeholder="https://api.example.com"
                type="text"
              />
              {renderFieldState("server_url")}

              <label className="runtime-field-label" htmlFor="runtime-api-key">API key</label>
              <input
                id="runtime-api-key"
                className={`runtime-field-input${isFieldDirty("api_key") ? " is-draft" : ""}${fieldMeta("api_key").invalid ? " is-invalid" : ""}`}
                value={draftConfig.api_key}
                onChange={(event) => updateDraft({ api_key: event.target.value })}
                placeholder="sk-..."
                type="password"
              />
              {renderFieldState("api_key")}
            </section>
          ) : (
            <>
              <section className="runtime-drawer-section runtime-section-card runtime-grid-two">
                <div>
                  <div className="runtime-field-label">Managed endpoint</div>
                  <div className="runtime-static-value runtime-static-value-mono">http://{draftConfig.addr.trim() || snapshot.config.addr}</div>
                </div>
                <div>
                  <div className="runtime-field-label">Binary discovery</div>
                  <div className="runtime-static-value runtime-static-value-path">{snapshot.binary_path || "Binary not found yet"}</div>
                </div>
              </section>

              <section className="runtime-drawer-section runtime-section-card">
                <div className="runtime-field-row runtime-field-row-top">
                  <div>
                    <div className="runtime-field-label">Managed library</div>
                    <div className="runtime-field-support">
                      App-managed downloads live outside your scanned folders so they survive app updates.
                    </div>
                  </div>
                </div>

                <div className="runtime-static-value runtime-static-value-path">
                  {libraryState.managed_dir || "Loading managed storage path..."}
                </div>

                {libraryState.entries.length > 0 ? (
                  <div className="runtime-chip-list">
                    {libraryState.entries.map((entry) => (
                      <button
                        key={entry.id}
                        className={`runtime-chip runtime-chip-selectable${draftConfig.selected_model_id === entry.id ? " active" : ""}${isFieldDirty("model_path") ? " is-draft" : ""}`}
                        onClick={() => updateDraft({ model_path: entry.path, selected_model_id: entry.id })}
                        type="button"
                        title={entry.path}
                      >
                        {entry.label}
                      </button>
                    ))}
                  </div>
                ) : (
                  <div className="runtime-field-support">No managed downloads yet.</div>
                )}
              </section>

              <section className="runtime-drawer-section runtime-section-card">
                <div className="runtime-field-row">
                  <div>
                    <div className="runtime-field-label">Models folder</div>
                    <div className={`runtime-static-value runtime-static-value-path${isFieldDirty("models_dir") ? " is-draft" : ""}${fieldMeta("models_dir").invalid ? " is-invalid" : ""}`}>
                      {draftConfig.models_dir || "Choose a folder or add individual files"}
                    </div>
                  </div>
                  <div className="runtime-inline-actions">
                    <button className="runtime-inline-btn" onClick={handlePickDir} type="button">Browse</button>
                    <button className="runtime-inline-btn" onClick={() => { void handleRescan(); }} type="button" disabled={!draftConfig.models_dir?.trim() || scanning}>
                      {scanning ? "Scanning..." : "Rescan"}
                    </button>
                    <button className="runtime-inline-btn" onClick={handlePickFiles} type="button">Add files</button>
                  </div>
                </div>
                {renderFieldState("models_dir")}

                <label className="runtime-field-label" htmlFor="runtime-model-select">Selected model</label>
                <select
                  id="runtime-model-select"
                  className={`runtime-field-input runtime-field-select${isFieldDirty("model_path") ? " is-draft" : ""}${fieldMeta("model_path").invalid ? " is-invalid" : ""}`}
                  value={draftConfig.model_path || ""}
                  onChange={(event) =>
                    updateDraft({
                      model_path: event.target.value || null,
                      selected_model_id: null,
                    })
                  }
                >
                  <option value="">Choose a model</option>
                  {allModels.map((model) => (
                    <option key={model.path} value={model.path}>{model.name}</option>
                  ))}
                </select>
                {renderFieldState("model_path")}

                {extraModels.length > 0 && (
                  <div className="runtime-chip-list">
                    {extraModels.map((model) => (
                      <button
                        key={model.path}
                        className="runtime-chip"
                        onClick={() => {
                          const next = extraModels.filter((entry) => entry.path !== model.path);
                          updateDraft({
                            extra_model_paths: next.map((entry) => entry.path),
                            model_path:
                              draftConfig.model_path === model.path
                                ? chooseModel("", scannedModels, next)
                                : draftConfig.model_path,
                            selected_model_id: draftConfig.model_path === model.path ? null : draftConfig.selected_model_id,
                          });
                        }}
                        type="button"
                        title={`Remove ${model.name}`}
                      >
                        {model.name}
                        <span>×</span>
                      </button>
                    ))}
                  </div>
                )}
              </section>

              <section className="runtime-drawer-section runtime-section-card">
                <div className="runtime-field-row runtime-field-row-top">
                  <div>
                    <div className="runtime-field-label">Discover from Hugging Face</div>
                    <div className="runtime-field-support">
                      Search public GGUF repos, preview verified files, and keep your local library as the primary runtime source.
                    </div>
                  </div>
                </div>

                <label className="runtime-field-label" htmlFor="runtime-hf-token">Optional Hugging Face token</label>
                <input
                  id="runtime-hf-token"
                  className={`runtime-field-input${isFieldDirty("hugging_face_token") ? " is-draft" : ""}`}
                  value={draftConfig.hugging_face_token}
                  onChange={(event) => updateDraft({ hugging_face_token: event.target.value })}
                  placeholder="hf_..."
                  type="password"
                />

                <div className="runtime-field-row runtime-field-row-top">
                  <div className="runtime-search-grow">
                    <label className="runtime-field-label" htmlFor="runtime-hf-search">Search public GGUF repos</label>
                    <input
                      id="runtime-hf-search"
                      className="runtime-field-input"
                      value={hfQuery}
                      onChange={(event) => setHfQuery(event.target.value)}
                      onInput={(event) => setHfQuery((event.target as HTMLInputElement).value)}
                      placeholder="phi-4, mistral, qwen..."
                      type="text"
                    />
                  </div>
                  <button className="runtime-inline-btn" onClick={() => { void handleHubSearch(); }} type="button" disabled={hfLoading}>
                    {hfLoading ? "Searching..." : "Search Hub"}
                  </button>
                </div>

                {hfResults.length > 0 ? (
                  <div className="runtime-search-results" aria-label="Hugging Face search results">
                    {hfResults.map((result) => (
                      <article key={result.repo_id} className="runtime-search-card">
                        <div className="runtime-search-title">{result.repo_id}</div>
                        <div className="runtime-field-support">{result.author || "Unknown author"}</div>
                        <div className="runtime-verified-file-list">
                          {result.verified_files.map((file) => (
                            <div key={`${result.repo_id}:${file.path}`} className="runtime-verified-file">
                              <span>{file.path}</span>
                              <span className="runtime-verified-file-meta">
                                {file.quantization || "gguf"}
                                {file.size ? ` · ${Math.round(file.size / (1024 * 1024))} MiB` : ""}
                              </span>
                            </div>
                          ))}
                        </div>
                      </article>
                    ))}
                  </div>
                ) : (
                  <div className="runtime-field-support">
                    {hfLoading ? "Looking up verified GGUF files..." : "Search for a model family to preview compatible local installs."}
                  </div>
                )}
              </section>

              <section className="runtime-drawer-section runtime-section-card runtime-grid-two">
                <div>
                  <label className="runtime-field-label" htmlFor="runtime-addr">Listen address</label>
                  <input
                    id="runtime-addr"
                    className={`runtime-field-input${isFieldDirty("addr") ? " is-draft" : ""}`}
                    value={draftConfig.addr}
                    onChange={(event) => updateDraft({ addr: event.target.value })}
                    placeholder="127.0.0.1:8080"
                    type="text"
                  />
                </div>
                <div>
                  <label className="runtime-field-label" htmlFor="runtime-context">Context size</label>
                  <input
                    id="runtime-context"
                    className={`runtime-field-input${isFieldDirty("ctx_size") ? " is-draft" : ""}`}
                    min={512}
                    step={512}
                    value={draftConfig.ctx_size}
                    onChange={(event) => updateDraft({ ctx_size: Math.max(512, parseInt(event.target.value, 10) || 4096) })}
                    type="number"
                  />
                </div>
              </section>

              <section className="runtime-drawer-section runtime-section-card">
                <div className="runtime-field-row runtime-field-row-top">
                  <div>
                    <div className="runtime-field-label">GPU layers</div>
                    <div className="runtime-field-support">
                      {gpuInfo ? `${gpuInfo.name} · recommended ${gpuInfo.recommended_layers}` : gpuError || "GPU detection unavailable"}
                    </div>
                  </div>
                  {gpuInfo && (
                    <button className="runtime-inline-btn" onClick={() => updateDraft({ gpu_layers: gpuInfo.recommended_layers })} type="button">
                      Use recommended
                    </button>
                  )}
                </div>

                <input
                  className={`runtime-field-input${isFieldDirty("gpu_layers") ? " is-draft" : ""}`}
                  min={0}
                  max={maxLayers}
                  value={draftConfig.gpu_layers}
                  onChange={(event) => updateDraft({ gpu_layers: Math.max(0, Math.min(maxLayers, parseInt(event.target.value, 10) || 0)) })}
                  type="number"
                />

                <div className="runtime-preset-row">
                  {CTX_PRESETS.map((preset) => (
                    <button
                      key={preset}
                      className={`runtime-preset${draftConfig.ctx_size === preset ? " active" : ""}`}
                      onClick={() => updateDraft({ ctx_size: preset })}
                      type="button"
                    >
                      {preset >= 1024 ? `${preset / 1024}k` : preset}
                    </button>
                  ))}
                </div>
              </section>

              <section className="runtime-drawer-section runtime-section-card">
                <label className="runtime-checkbox-row">
                  <input
                    checked={draftConfig.start_policy === "on_app_launch"}
                    onChange={(event) => updateDraft({ start_policy: event.target.checked ? "on_app_launch" : "manual" })}
                    type="checkbox"
                  />
                  <span>Start the local API automatically when the desktop app opens</span>
                </label>
              </section>
            </>
          )}

          {(localError || snapshot.last_error) && (
            <section className="runtime-drawer-section">
              <div className="runtime-error-banner">
                {localError || snapshot.last_error?.message || "Couldn't save your draft. Review the highlighted fields and try again — your unsaved changes are still here."}
              </div>
            </section>
          )}

          {showLifecycleResult && (
            <section className="runtime-drawer-section">
              <div
                className={`runtime-apply-guidance runtime-apply-guidance-${lastLifecycleResult.outcome}`}
                role="status"
                aria-live="polite"
              >
                {lastLifecycleResult.message}
              </div>
            </section>
          )}

          {applyGuidance && (
            <section className="runtime-drawer-section">
              <div
                className={`runtime-apply-guidance${applyImpact !== "immediate" ? " is-warning" : ""}`}
                role="status"
              >
                {applyGuidance}
              </div>
            </section>
          )}

          {!snapshot.process_running && draftConfig.connection_mode === "local" && startReason && (
            <section className="runtime-drawer-section">
              <div className="runtime-warning-banner">{startReason}</div>
            </section>
          )}
        </div>

        <div className="runtime-drawer-footer runtime-drawer-footer-sticky">
          <div className="runtime-footer-main-actions">
            <button
              className="runtime-footer-btn runtime-footer-btn-secondary"
              onClick={() => setConfirmDiscard(true)}
              type="button"
              disabled={busy || lifecycleBusy || !draftDirty}
            >
              Discard changes
            </button>
            <button
              className="runtime-footer-btn runtime-footer-btn-primary"
              onClick={() => { void handleSave(); }}
              type="button"
              disabled={busy || lifecycleBusy || !draftDirty || hasBlockingDraftState}
            >
              {saveLabel}
            </button>
          </div>

          {draftConfig.connection_mode === "local" && (
            <button
              className="runtime-footer-btn runtime-footer-btn-tertiary"
              onClick={() => { void handleSaveAndStart(); }}
              type="button"
              disabled={
                busy ||
                lifecycleBusy ||
                hasBlockingDraftState ||
                hasPendingModeChange ||
                restartRequiredWhileRunning ||
                (!snapshot.process_running && Boolean(startReason))
              }
            >
              {tertiaryLabel}
            </button>
          )}
        </div>

        {confirmDiscard && (
          <div className="runtime-discard-confirmation">
            <div className="runtime-discard-copy">Revert to saved: Replace all unsaved edits with the last saved values.</div>
            <div className="runtime-inline-actions">
              <button className="runtime-inline-btn" onClick={() => setConfirmDiscard(false)} type="button">
                Keep editing
              </button>
              <button
                className="runtime-inline-btn runtime-inline-btn-danger"
                onClick={() => {
                  onResetDraft?.();
                  setConfirmDiscard(false);
                }}
                type="button"
              >
                Revert to saved
              </button>
            </div>
          </div>
        )}
      </aside>
    </div>
  );
}