import {  type Dispatch,  type ReactNode,  createContext,  createElement,  useContext,  useReducer,} from "react"; import { type ProviderSession, normalizeProjectScripts } from "@t3tools/contracts";import { resolveModelSlug } from "./model-logic";import {  type ChatAttachment,  DEFAULT_THREAD_TERMINAL_ID,  DEFAULT_RUNTIME_MODE,  MAX_THREAD_TERMINAL_COUNT,  type ProjectScript,  type Project,  type RuntimeMode,  type Thread,  type ThreadTerminalGroup,} from "./types"; // ── Actions ────────────────────────────────────────────────────────── type Action =  | { type: "SET_SERVER_STATE"; state: AppState }  | { type: "ADD_PROJECT"; project: Project }  | { type: "SET_PROJECT_SCRIPTS"; projectId: string; scripts: ProjectScript[] }  | { type: "SYNC_PROJECTS"; projects: Project[] }  | { type: "SET_THREADS_HYDRATED"; hydrated: boolean }  | { type: "TOGGLE_PROJECT"; projectId: string }  | { type: "DELETE_PROJECT"; projectId: string }  | { type: "ADD_THREAD"; thread: Thread }  | { type: "TOGGLE_THREAD_TERMINAL"; threadId: string }  | { type: "SET_THREAD_TERMINAL_OPEN"; threadId: string; open: boolean }  | { type: "SET_THREAD_TERMINAL_HEIGHT"; threadId: string; height: number }  | { type: "SPLIT_THREAD_TERMINAL"; threadId: string; terminalId: string }  | { type: "NEW_THREAD_TERMINAL"; threadId: string; terminalId: string }  | { type: "SET_THREAD_ACTIVE_TERMINAL"; threadId: string; terminalId: string }  | { type: "CLOSE_THREAD_TERMINAL"; threadId: string; terminalId: string }  | { type: "UPDATE_SESSION"; threadId: string; session: ProviderSession }  | {      type: "PUSH_USER_MESSAGE";      threadId: string;      id: string;      text: string;      attachments?: ChatAttachment[];    }  | { type: "SET_ERROR"; threadId: string; error: string | null }  | { type: "SET_THREAD_TITLE"; threadId: string; title: string }  | { type: "SET_THREAD_MODEL"; threadId: string; model: string }  | {      type: "REVERT_TO_CHECKPOINT";      threadId: string;      sessionId: string;      threadRuntimeId: string;      turnCount: number;      messageCount: number;    }  | {      type: "SET_THREAD_TURN_CHECKPOINT_COUNTS";      threadId: string;      checkpointTurnCountByTurnId: Record<string, number>;    }  | {      type: "SET_THREAD_BRANCH";      threadId: string;      branch: string | null;      worktreePath: string | null;    }  | { type: "MARK_THREAD_VISITED"; threadId: string; visitedAt?: string }  | { type: "SET_RUNTIME_MODE"; mode: RuntimeMode }  | { type: "DELETE_THREAD"; threadId: string }; // ── State ──────────────────────────────────────────────────────────── export interface AppState {  projects: Project[];  threads: Thread[];  threadsHydrated: boolean;  runtimeMode: RuntimeMode;} const initialState: AppState = {  projects: [],  threads: [],  threadsHydrated: false,  runtimeMode: DEFAULT_RUNTIME_MODE,}; // ── Helpers ────────────────────────────────────────────────────────── function readPersistedState(): AppState {  return initialState;} function persistState(state: AppState): void {  void state;} function updateThread(  threads: Thread[],  threadId: string,  updater: (t: Thread) => Thread,): Thread[] {  return threads.map((t) => (t.id === threadId ? updater(t) : t));} function normalizeTerminalIds(terminalIds: string[]): string[] {  const ids = terminalIds.map((id) => id.trim()).filter((id) => id.length > 0);  const unique = [...new Set(ids)].slice(0, MAX_THREAD_TERMINAL_COUNT);  if (unique.length > 0) {    return unique;  }  return [DEFAULT_THREAD_TERMINAL_ID];} function normalizeRunningTerminalIds(  runningTerminalIds: string[],  terminalIds: string[],): string[] {  if (runningTerminalIds.length === 0) return [];  const validTerminalIdSet = new Set(terminalIds);  return [...new Set(runningTerminalIds)]    .map((id) => id.trim())    .filter((id) => id.length > 0 && validTerminalIdSet.has(id));}  function normalizeTerminalGroupIds(terminalIds: string[]): string[] {  return [...new Set(terminalIds.map((id) => id.trim()).filter((id) => id.length > 0))];} function fallbackGroupId(terminalId: string): string {  return `group-${terminalId}`;} function assignUniqueGroupId(groupId: string, usedGroupIds: Set<string>): string {  if (!usedGroupIds.has(groupId)) {    usedGroupIds.add(groupId);    return groupId;  }  let suffix = 2;  while (usedGroupIds.has(`${groupId}-${suffix}`)) {    suffix += 1;  }  const uniqueGroupId = `${groupId}-${suffix}`;  usedGroupIds.add(uniqueGroupId);  return uniqueGroupId;} function normalizeTerminalGroups(thread: Thread, terminalIds: string[]): ThreadTerminalGroup[] {  const validTerminalIdSet = new Set(terminalIds);  const assignedTerminalIds = new Set<string>();  const usedGroupIds = new Set<string>();  const groups: ThreadTerminalGroup[] = [];   for (const group of thread.terminalGroups) {    const groupTerminalIds = normalizeTerminalGroupIds(group.terminalIds).filter((terminalId) => {      if (!validTerminalIdSet.has(terminalId)) return false;      if (assignedTerminalIds.has(terminalId)) return false;      return true;    });    if (groupTerminalIds.length === 0) continue;    for (const terminalId of groupTerminalIds) {      assignedTerminalIds.add(terminalId);    }    const baseGroupId =      group.id.trim().length > 0        ? group.id.trim()        : fallbackGroupId(groupTerminalIds[0] ?? DEFAULT_THREAD_TERMINAL_ID);    groups.push({      id: assignUniqueGroupId(baseGroupId, usedGroupIds),      terminalIds: groupTerminalIds,    });  }   for (const terminalId of terminalIds) {    if (assignedTerminalIds.has(terminalId)) continue;    groups.push({      id: assignUniqueGroupId(fallbackGroupId(terminalId), usedGroupIds),      terminalIds: [terminalId],    });  }   if (groups.length > 0) {    return groups;  }   return [    {      id: fallbackGroupId(DEFAULT_THREAD_TERMINAL_ID),      terminalIds: [DEFAULT_THREAD_TERMINAL_ID],    },  ];} function findGroupIndexByTerminalId(  terminalGroups: ThreadTerminalGroup[],  terminalId: string,): number {  return terminalGroups.findIndex((group) => group.terminalIds.includes(terminalId));} function normalizeThreadTerminals(thread: Thread): Thread {  const terminalIds = normalizeTerminalIds(thread.terminalIds);  const activeTerminalId = terminalIds.includes(thread.activeTerminalId)    ? thread.activeTerminalId    : (terminalIds[0] ?? DEFAULT_THREAD_TERMINAL_ID);  const terminalGroups = normalizeTerminalGroups(thread, terminalIds);  const activeGroupIndexFromId = terminalGroups.findIndex(    (group) => group.id === thread.activeTerminalGroupId,  );  const activeGroupIndexFromTerminal = findGroupIndexByTerminalId(terminalGroups, activeTerminalId);  const activeGroupIndex =    activeGroupIndexFromId >= 0      ? activeGroupIndexFromId      : activeGroupIndexFromTerminal >= 0        ? activeGroupIndexFromTerminal        : 0;  const activeTerminalGroupId =    terminalGroups[activeGroupIndex]?.id ??    terminalGroups[0]?.id ??    fallbackGroupId(activeTerminalId);   return {    ...thread,    terminalIds,    runningTerminalIds: normalizeRunningTerminalIds(thread.runningTerminalIds, terminalIds),    activeTerminalId,    terminalGroups,    activeTerminalGroupId,  };} function closeThreadTerminal(thread: Thread, terminalId: string): Thread {  if (!thread.terminalIds.includes(terminalId)) {    return thread;  }   const remainingTerminalIds = thread.terminalIds.filter((id) => id !== terminalId);  if (remainingTerminalIds.length === 0) {    const nextTerminalGroupId = fallbackGroupId(DEFAULT_THREAD_TERMINAL_ID);    return normalizeThreadTerminals({      ...thread,      terminalOpen: false,      terminalIds: [DEFAULT_THREAD_TERMINAL_ID],      runningTerminalIds: [],      activeTerminalId: DEFAULT_THREAD_TERMINAL_ID,      terminalGroups: [        {          id: nextTerminalGroupId,          terminalIds: [DEFAULT_THREAD_TERMINAL_ID],        },      ],      activeTerminalGroupId: nextTerminalGroupId,    });  }   const closedTerminalIndex = thread.terminalIds.indexOf(terminalId);  const closedTerminalGroup = thread.terminalGroups.find((group) =>    group.terminalIds.includes(terminalId),  );  const closedTerminalGroupIndex = closedTerminalGroup    ? closedTerminalGroup.terminalIds.indexOf(terminalId)    : -1;  const remainingTerminalsInClosedGroup = (closedTerminalGroup?.terminalIds ?? []).filter(    (id) => id !== terminalId,  );  const nextActiveTerminalId =    thread.activeTerminalId === terminalId      ? (remainingTerminalsInClosedGroup[          Math.min(closedTerminalGroupIndex, remainingTerminalsInClosedGroup.length - 1)        ] ??        remainingTerminalIds[Math.min(closedTerminalIndex, remainingTerminalIds.length - 1)] ??        remainingTerminalIds[0] ??        DEFAULT_THREAD_TERMINAL_ID)      : thread.activeTerminalId;  const nextTerminalGroups = thread.terminalGroups    .map((group) => ({      ...group,      terminalIds: group.terminalIds.filter((id) => id !== terminalId),    }))    .filter((group) => group.terminalIds.length > 0);   return normalizeThreadTerminals({    ...thread,    terminalIds: remainingTerminalIds,    runningTerminalIds: thread.runningTerminalIds.filter((id) => id !== terminalId),    activeTerminalId: nextActiveTerminalId,    terminalGroups: nextTerminalGroups,  });} // ── Reducer ────────────────────────────────────────────────────────── export function reducer(state: AppState, action: Action): AppState {  switch (action.type) {    case "SET_SERVER_STATE":      return {        ...action.state,        threads: action.state.threads.map((thread) => normalizeThreadTerminals(thread)),      };     case "ADD_PROJECT":      if (state.projects.some((project) => project.cwd === action.project.cwd)) {        return state;      }      return {        ...state,        projects: [          ...state.projects,          {            ...action.project,            model: resolveModelSlug(action.project.model),            scripts: normalizeProjectScripts(action.project.scripts),          },        ],      };     case "SET_PROJECT_SCRIPTS":      return {        ...state,        projects: state.projects.map((project) =>          project.id === action.projectId            ? { ...project, scripts: normalizeProjectScripts(action.scripts) }            : project,        ),      };     case "SET_THREADS_HYDRATED":      if (state.threadsHydrated === action.hydrated) {        return state;      }      return {        ...state,        threadsHydrated: action.hydrated,      };     case "SYNC_PROJECTS": {      const previousByCwd = new Map(        state.projects.map((project) => [project.cwd, project] as const),      );      const nextProjects = action.projects.map((project) => {        const previous = previousByCwd.get(project.cwd);        const scripts = normalizeProjectScripts(project.scripts);        return {          ...project,          model: resolveModelSlug(previous?.model ?? project.model),          expanded: previous?.expanded ?? project.expanded,          scripts,        };      });      const previousProjectById = new Map(        state.projects.map((project) => [project.id, project] as const),      );      const nextProjectIdByCwd = new Map(        nextProjects.map((project) => [project.cwd, project.id] as const),      );      const nextThreads = state.threads        .map((thread) => {          const previousProject = previousProjectById.get(thread.projectId);          if (!previousProject) return null;          const mappedProjectId = nextProjectIdByCwd.get(previousProject.cwd);          if (!mappedProjectId) return null;          return normalizeThreadTerminals({            ...thread,            projectId: mappedProjectId,          });        })        .filter((thread): thread is Thread => thread !== null);       return {        ...state,        projects: nextProjects,        threads: nextThreads,      };    }     case "TOGGLE_PROJECT":      return {        ...state,        projects: state.projects.map((p) =>          p.id === action.projectId ? { ...p, expanded: !p.expanded } : p,        ),      };     case "DELETE_PROJECT": {      const projects = state.projects.filter((project) => project.id !== action.projectId);      if (projects.length === state.projects.length) {        return state;      }       const threads = state.threads.filter((thread) => thread.projectId !== action.projectId);       return {        ...state,        projects,        threads,      };    }     case "ADD_THREAD": {      const nextThread = normalizeThreadTerminals({        ...action.thread,        model: resolveModelSlug(action.thread.model),        lastVisitedAt: action.thread.lastVisitedAt ?? action.thread.createdAt,        turnDiffSummaries: action.thread.turnDiffSummaries ?? [],      });      return {        ...state,        threads: [...state.threads, nextThread],      };    }     case "TOGGLE_THREAD_TERMINAL":      return {        ...state,        threads: updateThread(state.threads, action.threadId, (t) => ({          ...t,          terminalOpen: !t.terminalOpen,        })),      };     case "SET_THREAD_TERMINAL_OPEN":      return {        ...state,        threads: updateThread(state.threads, action.threadId, (t) => ({          ...t,          terminalOpen: action.open,        })),      };     case "SET_THREAD_TERMINAL_HEIGHT":      return {        ...state,        threads: updateThread(state.threads, action.threadId, (t) => ({          ...t,          terminalHeight: action.height,        })),      };     case "SPLIT_THREAD_TERMINAL":      return {        ...state,        threads: updateThread(state.threads, action.threadId, (thread) => {          const normalizedThread = normalizeThreadTerminals(thread);          const isNewTerminal = !normalizedThread.terminalIds.includes(action.terminalId);          if (            isNewTerminal &&            normalizedThread.terminalIds.length >= MAX_THREAD_TERMINAL_COUNT          ) {            return normalizedThread;          }          const terminalIds = normalizedThread.terminalIds.includes(action.terminalId)            ? normalizedThread.terminalIds            : [...normalizedThread.terminalIds, action.terminalId];          const terminalGroups = normalizedThread.terminalGroups.map((group) => ({            ...group,            terminalIds: [...group.terminalIds],          }));          let activeGroupIndex = terminalGroups.findIndex(            (group) => group.id === normalizedThread.activeTerminalGroupId,          );          if (activeGroupIndex < 0) {            activeGroupIndex = findGroupIndexByTerminalId(              terminalGroups,              normalizedThread.activeTerminalId,            );          }          if (activeGroupIndex < 0) {            terminalGroups.push({              id: fallbackGroupId(normalizedThread.activeTerminalId),              terminalIds: [normalizedThread.activeTerminalId],            });            activeGroupIndex = terminalGroups.length - 1;          }           const existingGroupIndex = findGroupIndexByTerminalId(terminalGroups, action.terminalId);          if (existingGroupIndex >= 0) {            terminalGroups[existingGroupIndex]!.terminalIds = terminalGroups[              existingGroupIndex            ]!.terminalIds.filter((id) => id !== action.terminalId);            if (terminalGroups[existingGroupIndex]!.terminalIds.length === 0) {              terminalGroups.splice(existingGroupIndex, 1);              if (existingGroupIndex < activeGroupIndex) {                activeGroupIndex -= 1;              }            }          }           const destinationGroup = terminalGroups[activeGroupIndex];          if (!destinationGroup) {            return normalizedThread;          }          if (!destinationGroup.terminalIds.includes(action.terminalId)) {            const anchorIndex = destinationGroup.terminalIds.indexOf(              normalizedThread.activeTerminalId,            );

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