import {  type ProviderInstanceId,  type ProviderDriverKind,  type ResolvedKeybindingsConfig,} from "@t3tools/contracts";import { resolveSelectableModel } from "@t3tools/shared/model";import { LegendList, type LegendListRef } from "@legendapp/list/react";import { memo, useMemo, useState, useCallback, useEffect, useLayoutEffect, useRef } from "react";import { ChevronRightIcon, SearchIcon } from "lucide-react";import { ModelListRow } from "./ModelListRow";import { ModelPickerSidebar } from "./ModelPickerSidebar";import {  modelPickerLegacySectionKey,  modelPickerModelKey,  parseModelPickerLegacySectionKey,  parseModelPickerModelKey,} from "./modelPickerKeys";import { buildModelPickerSearchText, scoreModelPickerSearch } from "./modelPickerSearch";import {  Combobox,  ComboboxEmpty,  ComboboxInput,  ComboboxItem,  ComboboxListVirtualized,} from "../ui/combobox";import { ModelEsque } from "./providerIconUtils";import {  modelPickerJumpCommandForIndex,  modelPickerJumpIndexFromCommand,  resolveShortcutCommand,  shortcutLabelForCommand,} from "../../keybindings";import { useClientSettings, useUpdateClientSettings } from "~/hooks/useSettings";import { cn } from "~/lib/utils";import { getVirtualizedScrollFadeClassName } from "../ui/scroll-area";import { TooltipProvider } from "../ui/tooltip";import {  isProviderInstancePickerReady,  isProviderInstancePickerVisible,  type ProviderInstanceEntry,} from "../../providerInstances";import { providerModelKey, sortProviderModelItems } from "../../modelOrdering"; type ModelPickerItem = {  slug: string;  name: string;  shortName?: string;  subProvider?: string;  badge?: "new";  instanceId: ProviderInstanceId;  driverKind: ProviderDriverKind;  instanceDisplayName: string;  instanceAccentColor?: string | undefined;  continuationGroupKey?: string | undefined;  isLegacy?: boolean | undefined;  isUnavailable?: boolean | undefined;}; export function shouldIncludeModelPickerOption(input: {  readonly entry: ProviderInstanceEntry;  readonly option: ModelEsque;  readonly activeInstanceId: ProviderInstanceId;  readonly activeModel: string;}): boolean {  if (isProviderInstancePickerReady(input.entry)) return true;  return (    input.entry.enabled &&    input.entry.driverKind === "opencode" &&    input.entry.instanceId === input.activeInstanceId &&    input.option.slug === input.activeModel &&    input.option.isUnavailable === true  );} const EMPTY_MODEL_JUMP_LABELS = new Map<string, string>(); function ModelListSeparator() {  return <div className="h-0.5" />;} 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;  getModelDisabledReason?: (instanceId: ProviderInstanceId, model: string) => string | null;  onInstanceModelChange: (instanceId: ProviderInstanceId, model: string) => void;}) {  const {    keybindings: providedKeybindings,    modelOptionsByInstance,    instanceEntries,    getModelDisabledReason,    onInstanceModelChange,  } = props;  const [searchQuery, setSearchQuery] = useState("");  const [showTopScrollFade, setShowTopScrollFade] = useState(false);  const [showBottomScrollFade, setShowBottomScrollFade] = useState(false);  const searchInputRef = useRef<HTMLInputElement>(null);  const modelListRef = useRef<LegendListRef | null>(null);  const highlightedModelKeyRef = useRef<string | null>(null);  const favorites = useClientSettings((s) => s.favorites ?? []);  const activeEntry = props.instanceEntries.find(    (entry) => entry.instanceId === props.activeInstanceId,  );  const activeInstanceHasSelectableUnavailableModel =    activeEntry !== undefined &&    (modelOptionsByInstance.get(props.activeInstanceId) ?? []).some((option) =>      shouldIncludeModelPickerOption({        entry: activeEntry,        option,        activeInstanceId: props.activeInstanceId,        activeModel: props.model,      }),    ) &&    !isProviderInstancePickerReady(activeEntry);  const [selectedInstanceId, setSelectedInstanceId] = useState<ProviderInstanceId | "favorites">(    () => {      if (props.lockedProvider !== null || activeInstanceHasSelectableUnavailableModel) {        // 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 [expandedLegacyInstances, setExpandedLegacyInstances] = useState(    () =>      new Set<ProviderInstanceId>(        modelOptionsByInstance          .get(props.activeInstanceId)          ?.some((model) => model.slug === props.model && model.isLegacy)          ? [props.activeInstanceId]          : [],      ),  );  const keybindings = useMemo<ResolvedKeybindingsConfig>(    () => providedKeybindings ?? [],    [providedKeybindings],  );  const updateSettings = useUpdateClientSettings();   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 selectableUnavailableInstanceIds = useMemo(() => {    if (!activeInstanceHasSelectableUnavailableModel) {      return undefined;    }    return new Set([props.activeInstanceId]);  }, [activeInstanceHasSelectableUnavailableModel, props.activeInstanceId]);   // 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;      }      for (const model of models) {        if (          !shouldIncludeModelPickerOption({            entry,            option: model,            activeInstanceId: props.activeInstanceId,            activeModel: props.model,          })        ) {          continue;        }        out.push({          slug: model.slug,          name: model.name,          ...(model.shortName ? { shortName: model.shortName } : {}),          ...(model.subProvider ? { subProvider: model.subProvider } : {}),          ...(model.badge ? { badge: model.badge } : {}),          ...(model.isLegacy ? { isLegacy: true } : {}),          ...(model.isUnavailable ? { isUnavailable: true } : {}),          instanceId,          driverKind: entry.driverKind,          instanceDisplayName: entry.displayName,          ...(entry.accentColor ? { instanceAccentColor: entry.accentColor } : {}),          ...(entry.continuationGroupKey            ? { continuationGroupKey: entry.continuationGroupKey }            : {}),        });      }    }    return out;  }, [modelOptionsByInstance, entryByInstanceId, props.activeInstanceId, props.model]);   const isLocked = props.lockedProvider !== null;  const isSearching = searchQuery.trim().length > 0;  const lockedDisabledInstanceIds = useMemo(() => {    if (!isLocked) {      return undefined;    }    const disabled = new Set<ProviderInstanceId>();    for (const entry of instanceEntries) {      if (!matchesLockedProvider(entry)) {        disabled.add(entry.instanceId);      }    }    return disabled;  }, [instanceEntries, isLocked, matchesLockedProvider]);  const sidebarInstanceEntries = useMemo(() => {    const enabledEntries = instanceEntries.filter(isProviderInstancePickerVisible);    if (!isLocked) {      return enabledEntries;    }    const available: ProviderInstanceEntry[] = [];    const disabled: ProviderInstanceEntry[] = [];    for (const entry of enabledEntries) {      if (matchesLockedProvider(entry)) {        available.push(entry);      } else {        disabled.push(entry);      }    }    return [...available, ...disabled];  }, [instanceEntries, isLocked, matchesLockedProvider]);  const showSidebar = !isSearching && sidebarInstanceEntries.length > 0;  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 (selectedInstanceId === "favorites") {        result = result.filter((m) => favoritesSet.has(providerModelKey(m.instanceId, m.slug)));      } else {        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,    selectedInstanceId,  ]);   const legacySection = useMemo(() => {    if (isSearching || selectedInstanceId === "favorites") {      return null;    }    const currentModels = filteredModels.filter((model) => !model.isLegacy);    const legacyModels = filteredModels.filter((model) => model.isLegacy);    if (legacyModels.length === 0) {      return null;    }    return {      key: modelPickerLegacySectionKey(selectedInstanceId),      currentModels,      legacyModels,      isExpanded: expandedLegacyInstances.has(selectedInstanceId),    };  }, [expandedLegacyInstances, filteredModels, isSearching, selectedInstanceId]);   const visibleModels = useMemo(() => {    if (!legacySection) {      return filteredModels;    }    return [      ...legacySection.currentModels,      ...(legacySection.isExpanded ? legacySection.legacyModels : []),    ];  }, [filteredModels, legacySection]);   const toggleLegacySection = useCallback((instanceId: ProviderInstanceId) => {    setExpandedLegacyInstances((expanded) => {      const next = new Set(expanded);      if (next.has(instanceId)) {        next.delete(instanceId);      } else {        next.add(instanceId);      }      return next;    });  }, []);   const handleModelSelect = useCallback(    (modelSlug: string, instanceId: ProviderInstanceId) => {      if (getModelDisabledReason?.(instanceId, modelSlug)) {        return;      }      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, getModelDisabledReason, 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 modelJumpCommandByKey = useMemo(() => {    const mapping = new Map<      string,      NonNullable<ReturnType<typeof modelPickerJumpCommandForIndex>>    >();    let selectableModelIndex = 0;    for (const model of visibleModels) {

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