import {  type ProviderInstanceId,  type ProviderDriverKind,  type ResolvedKeybindingsConfig,} from "@t3tools/contracts";import { resolveSelectableModel } from "@t3tools/shared/model";import { memo, useMemo, useState, useCallback, useEffect, useLayoutEffect, useRef } from "react";import { SearchIcon } from "lucide-react";import { ModelListRow } from "./ModelListRow";import { ModelPickerSidebar } from "./ModelPickerSidebar";import { isModelPickerNewModel } from "./modelPickerModelHighlights";import { buildModelPickerSearchText, scoreModelPickerSearch } from "./modelPickerSearch";import { Combobox, ComboboxEmpty, ComboboxInput, ComboboxList } from "../ui/combobox";import { ModelEsque, PROVIDER_ICON_BY_PROVIDER } from "./providerIconUtils";import {  modelPickerJumpCommandForIndex,  modelPickerJumpIndexFromCommand,  resolveShortcutCommand,  shortcutLabelForCommand,} from "../../keybindings";import { useSettings, useUpdateSettings } from "~/hooks/useSettings";import { cn } from "~/lib/utils";import { TooltipProvider } from "../ui/tooltip";import type { ProviderInstanceEntry } from "../../providerInstances";import { providerModelKey, sortProviderModelItems } from "../../modelOrdering"; type ModelPickerItem = {  slug: string;  name: string;  shortName?: string;  subProvider?: string;  instanceId: ProviderInstanceId;  driverKind: ProviderDriverKind;  instanceDisplayName: string;  instanceAccentColor?: string | undefined;  continuationGroupKey?: string | undefined;}; const EMPTY_MODEL_JUMP_LABELS = new Map<string, string>(); // Split a `${instanceId}:${slug}` combobox key back into its pieces. Slugs// can contain colons (e.g. some vendor model ids), so we only split on the// first colon — anything after that is the slug.function splitInstanceModelKey(key: string): { instanceId: ProviderInstanceId; slug: string } {  const colonIndex = key.indexOf(":");  if (colonIndex === -1) {    return { instanceId: key as ProviderInstanceId, slug: "" };  }  return {    instanceId: key.slice(0, colonIndex) as ProviderInstanceId,    slug: key.slice(colonIndex + 1),  };} export const ModelPickerContent = memo(function ModelPickerContent(props: {  /** The instance currently selected in the composer (combobox "value"). */  activeInstanceId: ProviderInstanceId;  model: string;  /**   * When set, the picker is locked to the given driver kind — typically   * because the user is editing a previously-sent message and can't change   * which driver served the turn. Multiple instances of the same kind   * remain selectable (e.g. locked to `codex` still lets the user switch   * between the default Codex and a custom Codex Personal).   */  lockedProvider: ProviderDriverKind | null;  lockedContinuationGroupKey?: string | null;  /**   * All configured provider instances in display order. Used to render   * the sidebar (one button per instance) and to resolve display names   * for the locked-mode header.   */  instanceEntries: ReadonlyArray<ProviderInstanceEntry>;  keybindings?: ResolvedKeybindingsConfig;  /**   * Model options per instance. Keyed by `ProviderInstanceId` so the   * default Codex instance and any custom Codex instances each have their   * own list (custom instances typically start with the same built-in   * model set but are free to diverge via customModels).   */  modelOptionsByInstance: ReadonlyMap<ProviderInstanceId, ReadonlyArray<ModelEsque>>;  terminalOpen: boolean;  onRequestClose?: () => void;  onInstanceModelChange: (instanceId: ProviderInstanceId, model: string) => void;}) {  const {    keybindings: providedKeybindings,    modelOptionsByInstance,    instanceEntries,    onInstanceModelChange,  } = props;  const [searchQuery, setSearchQuery] = useState("");  const searchInputRef = useRef<HTMLInputElement>(null);  const listRegionRef = useRef<HTMLDivElement>(null);  const highlightedModelKeyRef = useRef<string | null>(null);  const favorites = useSettings((s) => s.favorites ?? []);  const [selectedInstanceId, setSelectedInstanceId] = useState<ProviderInstanceId | "favorites">(    () => {      if (props.lockedProvider !== null) {        // When locked, prime the sidebar to the currently-active instance        // so jumping into the picker keeps the focused instance visible.        return props.activeInstanceId;      }      return favorites.length > 0 ? "favorites" : props.activeInstanceId;    },  );  const keybindings = useMemo<ResolvedKeybindingsConfig>(    () => providedKeybindings ?? [],    [providedKeybindings],  );  const { updateSettings } = useUpdateSettings();   const focusSearchInput = useCallback(() => {    searchInputRef.current?.focus({ preventScroll: true });  }, []);   const handleSelectInstance = useCallback(    (instanceId: ProviderInstanceId | "favorites") => {      setSelectedInstanceId(instanceId);      window.requestAnimationFrame(() => {        focusSearchInput();      });    },    [focusSearchInput],  );   useLayoutEffect(() => {    focusSearchInput();    const frame = window.requestAnimationFrame(() => {      focusSearchInput();    });    const timeout = window.setTimeout(() => {      focusSearchInput();    }, 0);    return () => {      window.cancelAnimationFrame(frame);      window.clearTimeout(timeout);    };  }, [focusSearchInput]);   // Create a Set for efficient lookup. Favorites are keyed by  // `${instanceId}:${slug}`; the storage schema widened from ProviderDriverKind  // to ProviderInstanceId so pre-migration favorites keyed by driver slugs  // (e.g. `"codex:gpt-5"`) still resolve — the default instance id equals  // the driver slug.  const favoritesSet = useMemo(() => {    return new Set(favorites.map((fav) => providerModelKey(fav.provider, fav.model)));  }, [favorites]);   /**   * Lookup table keyed by `instanceId`. Used for display name + driver   * kind enrichment and for `ready`/enabled filtering before flattening   * models into the search list.   */  const entryByInstanceId = useMemo(    () => new Map(instanceEntries.map((entry) => [entry.instanceId, entry])),    [instanceEntries],  );  const matchesLockedProvider = useCallback(    (entry: Pick<ProviderInstanceEntry, "driverKind" | "continuationGroupKey">): boolean => {      if (props.lockedProvider === null) return true;      if (entry.driverKind !== props.lockedProvider) return false;      if (!props.lockedContinuationGroupKey) return true;      return entry.continuationGroupKey === props.lockedContinuationGroupKey;    },    [props.lockedContinuationGroupKey, props.lockedProvider],  );   const readyInstanceSet = useMemo(() => {    const ready = new Set<ProviderInstanceId>();    for (const entry of instanceEntries) {      if (entry.status === "ready") {        ready.add(entry.instanceId);      }    }    return ready;  }, [instanceEntries]);   // Flatten models into a searchable array. One pass over the  // instance-keyed map; each model carries its instance id + driver kind  // so the list row can render the right icon and display name without  // another lookup.  const flatModels = useMemo(() => {    const out: ModelPickerItem[] = [];    for (const [instanceId, models] of modelOptionsByInstance) {      const entry = entryByInstanceId.get(instanceId);      if (!entry) {        // Instance disappeared between renders (configuration change). Skip        // its models — stale options shouldn't appear in the picker.        continue;      }      if (!readyInstanceSet.has(instanceId)) {        continue;      }      for (const model of models) {        out.push({          slug: model.slug,          name: model.name,          ...(model.shortName ? { shortName: model.shortName } : {}),          ...(model.subProvider ? { subProvider: model.subProvider } : {}),          instanceId,          driverKind: entry.driverKind,          instanceDisplayName: entry.displayName,          ...(entry.accentColor ? { instanceAccentColor: entry.accentColor } : {}),          ...(entry.continuationGroupKey            ? { continuationGroupKey: entry.continuationGroupKey }            : {}),        });      }    }    return out;  }, [modelOptionsByInstance, entryByInstanceId, readyInstanceSet]);   const isLocked = props.lockedProvider !== null;  const isSearching = searchQuery.trim().length > 0;  const lockedInstanceEntries = useMemo(    () =>      props.lockedProvider ? instanceEntries.filter((entry) => matchesLockedProvider(entry)) : [],    [instanceEntries, matchesLockedProvider, props.lockedProvider],  );  const showLockedInstanceSidebar = isLocked && lockedInstanceEntries.length > 1;  const showSidebar = !isSearching && (!isLocked || showLockedInstanceSidebar);  const sidebarInstanceEntries = showLockedInstanceSidebar    ? lockedInstanceEntries    : instanceEntries;  const instanceOrder = useMemo(    () => instanceEntries.map((entry) => entry.instanceId),    [instanceEntries],  );   // Filter models based on search query and selected instance  const filteredModels = useMemo(() => {    let result = flatModels;     // Apply tokenized fuzzy search across the combined provider/model search fields.    if (searchQuery.trim()) {      const rankedMatches = result        .map((model) => ({          model,          score: scoreModelPickerSearch(            {              name: model.name,              ...(model.shortName ? { shortName: model.shortName } : {}),              ...(model.subProvider ? { subProvider: model.subProvider } : {}),              driverKind: model.driverKind,              providerDisplayName: model.instanceDisplayName,              isFavorite: favoritesSet.has(providerModelKey(model.instanceId, model.slug)),            },            searchQuery,          ),          isFavorite: favoritesSet.has(providerModelKey(model.instanceId, model.slug)),          tieBreaker: buildModelPickerSearchText({            name: model.name,            ...(model.shortName ? { shortName: model.shortName } : {}),            ...(model.subProvider ? { subProvider: model.subProvider } : {}),            driverKind: model.driverKind,            providerDisplayName: model.instanceDisplayName,          }),        }))        .filter(          (            rankedModel,          ): rankedModel is {            model: ModelPickerItem;            score: number;            isFavorite: boolean;            tieBreaker: string;          } => rankedModel.score !== null,        );       // When searching, we only respect locked provider (by driver kind),      // ignoring sidebar selection so account-scoped searches can find a      // model before the user chooses a specific instance rail item.      if (props.lockedProvider !== null) {        const lockedProviderMatches: Array<(typeof rankedMatches)[number]> = [];        for (const rankedModel of rankedMatches) {          if (matchesLockedProvider(rankedModel.model)) {            lockedProviderMatches.push(rankedModel);          }        }        return lockedProviderMatches          .toSorted((a, b) => {            const scoreDelta = a.score - b.score;            if (scoreDelta !== 0) {              return scoreDelta;            }            if (a.isFavorite !== b.isFavorite) {              return a.isFavorite ? -1 : 1;            }            return a.tieBreaker.localeCompare(b.tieBreaker);          })          .map((rankedModel) => rankedModel.model);      }       return rankedMatches        .toSorted((a, b) => {          const scoreDelta = a.score - b.score;          if (scoreDelta !== 0) {            return scoreDelta;          }          if (a.isFavorite !== b.isFavorite) {            return a.isFavorite ? -1 : 1;          }          return a.tieBreaker.localeCompare(b.tieBreaker);        })        .map((rankedModel) => rankedModel.model);    }     if (props.lockedProvider !== null) {      result = result.filter((m) => matchesLockedProvider(m));      if (showLockedInstanceSidebar) {        result = result.filter((m) => m.instanceId === selectedInstanceId);      }    } else if (selectedInstanceId === "favorites") {      result = result.filter((m) => favoritesSet.has(providerModelKey(m.instanceId, m.slug)));    } else {      result = result.filter((m) => m.instanceId === selectedInstanceId);    }     return sortProviderModelItems(result, {      favoriteModelKeys: favoritesSet,      groupFavorites: selectedInstanceId !== "favorites",      instanceOrder: selectedInstanceId === "favorites" ? instanceOrder : [],    });  }, [    favoritesSet,    flatModels,    instanceOrder,    matchesLockedProvider,    props.lockedProvider,    searchQuery,    showLockedInstanceSidebar,    selectedInstanceId,  ]);   const handleModelSelect = useCallback(    (modelSlug: string, instanceId: ProviderInstanceId) => {      const options = modelOptionsByInstance.get(instanceId);      if (!options) {        return;      }      const entry = entryByInstanceId.get(instanceId);      if (!entry) {        return;      }      // `resolveSelectableModel` uses the driver kind for normalization      // (slug casing etc.). Custom instances share their driver's      // normalization rules, so pass the driver kind here.      const resolvedModel = resolveSelectableModel(entry.driverKind, modelSlug, options);      if (resolvedModel) {        onInstanceModelChange(instanceId, resolvedModel);      }    },    [entryByInstanceId, modelOptionsByInstance, onInstanceModelChange],  );   const toggleFavorite = useCallback(    (instanceId: ProviderInstanceId, model: string) => {      const newFavorites = [...favorites];      const index = newFavorites.findIndex((f) => f.provider === instanceId && f.model === model);      if (index >= 0) {        newFavorites.splice(index, 1);      } else {        newFavorites.push({ provider: instanceId, model });      }      updateSettings({ favorites: newFavorites });    },    [favorites, updateSettings],  );   const LockedProviderIcon =    isLocked && props.lockedProvider ? PROVIDER_ICON_BY_PROVIDER[props.lockedProvider] : null;  // Header label for locked mode. Use the active instance's displayName  // when the lock narrows to exactly one instance (so "Codex Personal"  // shows instead of the generic driver label); fall back to the first  // matching entry otherwise.  const lockedHeaderLabel = useMemo(() => {    if (!isLocked || !props.lockedProvider) return null;    const matches = instanceEntries.filter((entry) => matchesLockedProvider(entry));    if (matches.length === 0) return null;    const active = matches.find((entry) => entry.instanceId === props.activeInstanceId);    return (active ?? matches[0])?.displayName ?? null;  }, [    isLocked,    matchesLockedProvider,    props.lockedProvider,    props.activeInstanceId,    instanceEntries,  ]);  const modelJumpCommandByKey = useMemo(() => {    const mapping = new Map<      string,      NonNullable<ReturnType<typeof modelPickerJumpCommandForIndex>>    >();    for (const [visibleModelIndex, model] of filteredModels.entries()) {      const jumpCommand = modelPickerJumpCommandForIndex(visibleModelIndex);      if (!jumpCommand) {        return mapping;      }      mapping.set(`${model.instanceId}:${model.slug}`, jumpCommand);    }    return mapping;  }, [filteredModels]);  const modelJumpModelKeys = useMemo(    () => [...modelJumpCommandByKey.keys()],    [modelJumpCommandByKey],  );  const allModelKeys = useMemo(    (): string[] => flatModels.map((model) => `${model.instanceId}:${model.slug}`),    [flatModels],  );  const filteredModelKeys = useMemo(    (): string[] => filteredModels.map((model) => `${model.instanceId}:${model.slug}`),    [filteredModels],  );  const filteredModelByKey = useMemo(    (): ReadonlyMap<string, ModelPickerItem> =>      new Map(filteredModels.map((model) => [`${model.instanceId}:${model.slug}`, model] as const)),    [filteredModels],  );  const modelJumpShortcutContext = useMemo(    () =>      ({        terminalFocus: false,        terminalOpen: props.terminalOpen,        modelPickerOpen: true,      }) as const,    [props.terminalOpen],  );  const modelJumpLabelByKey = useMemo((): ReadonlyMap<string, string> => {    if (modelJumpCommandByKey.size === 0) {      return EMPTY_MODEL_JUMP_LABELS;    }    const shortcutLabelOptions = {      platform: navigator.platform,      context: modelJumpShortcutContext,    };    const mapping = new Map<string, string>();    for (const [modelKey, command] of modelJumpCommandByKey) {      const label = shortcutLabelForCommand(keybindings, command, shortcutLabelOptions);      if (label) {        mapping.set(modelKey, label);      }    }    return mapping.size > 0 ? mapping : EMPTY_MODEL_JUMP_LABELS;  }, [keybindings, modelJumpCommandByKey, modelJumpShortcutContext]);   useEffect(() => {    const onWindowKeyDown = (event: globalThis.KeyboardEvent) => {      if (event.defaultPrevented || event.repeat) {        return;      }       const command = resolveShortcutCommand(event, keybindings, {        platform: navigator.platform,        context: modelJumpShortcutContext,      });      const jumpIndex = modelPickerJumpIndexFromCommand(command ?? "");      if (jumpIndex === null) {        return;      }       const targetModelKey = modelJumpModelKeys[jumpIndex];      if (!targetModelKey) {        return;      }      const { instanceId, slug } = splitInstanceModelKey(targetModelKey);      event.preventDefault();      event.stopPropagation();      handleModelSelect(slug, instanceId);    };     window.addEventListener("keydown", onWindowKeyDown, true);     return () => {      window.removeEventListener("keydown", onWindowKeyDown, true);    };  }, [handleModelSelect, keybindings, modelJumpModelKeys, modelJumpShortcutContext]);   useLayoutEffect(() => {    const listRegion = listRegionRef.current;    if (!listRegion) {      return;    }     let cancelled = false;    let frame = 0;    let nestedFrame = 0;    let timeout = 0;     const measureScrollArea = () => {      if (cancelled) {        return;      }      const viewport = listRegion.querySelector<HTMLElement>('[data-slot="scroll-area-viewport"]');      if (!viewport || viewport.scrollHeight <= viewport.clientHeight) {        return;      }      const originalScrollTop = viewport.scrollTop;      const maxScrollTop = viewport.scrollHeight - viewport.clientHeight;

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