| 1 | import { useMemo, useSyncExternalStore } from "react"; |
| 2 | |
| 3 | export type SessionExperience = "standard" | "deep"; |
| 4 | |
| 5 | export type WorkProcessPresentation = { |
| 6 | experience: SessionExperience; |
| 7 | showWhileRunning: true; |
| 8 | keepExpandedAfterCompletion: boolean; |
| 9 | }; |
| 10 | |
| 11 | const SESSION_EXPERIENCE_KEY = "reasonix-session-experience"; |
| 12 | const SESSION_EXPERIENCE_EVENT = "reasonix:session-experience"; |
| 13 | |
| 14 | let current: SessionExperience = "standard"; |
| 15 | let hydrated = false; |
| 16 | const listeners = new Set<() => void>(); |
| 17 | const beforeChangeListeners = new Set<(previous: SessionExperience, next: SessionExperience) => void>(); |
| 18 | |
| 19 | function normalize(value: unknown): SessionExperience { |
| 20 | return value === "deep" ? "deep" : "standard"; |
| 21 | } |
| 22 | |
| 23 | function emit(): void { |
| 24 | for (const listener of listeners) listener(); |
| 25 | if (typeof window !== "undefined") { |
| 26 | window.dispatchEvent(new CustomEvent(SESSION_EXPERIENCE_EVENT, { detail: current })); |
| 27 | } |
| 28 | } |
| 29 | |
| 30 | function emitCompatibilitySignals(next: SessionExperience): void { |
| 31 | if (typeof window !== "undefined") { |
| 32 | window.dispatchEvent(new CustomEvent("reasonix:process-fold", { |
| 33 | detail: next === "deep" ? "expanded" : "auto", |
| 34 | })); |
| 35 | window.dispatchEvent(new CustomEvent("reasonix:reasoning-display-mode", { |
| 36 | detail: next === "deep" ? "expanded" : "auto", |
| 37 | })); |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | function writeCompatibilityMirrors(next: SessionExperience): void { |
| 42 | if (typeof localStorage === "undefined") return; |
| 43 | localStorage.setItem(SESSION_EXPERIENCE_KEY, next); |
| 44 | localStorage.setItem("reasonix-display-mode", "standard"); |
| 45 | localStorage.setItem("reasonix-process-fold", next === "deep" ? "expanded" : "auto"); |
| 46 | // The oldest boolean summary key cannot represent Deep. Let the mirrored |
| 47 | // backend reasoning field win instead of reviving a contradictory value. |
| 48 | localStorage.removeItem("reasonix-reasoning-summary"); |
| 49 | } |
| 50 | |
| 51 | export function getSessionExperience(): SessionExperience { |
| 52 | // The backend snapshot is authoritative. Before it arrives, use the safe |
| 53 | // default instead of reviving a stale value written by an older frontend. |
| 54 | if (!hydrated) return "standard"; |
| 55 | return current; |
| 56 | } |
| 57 | |
| 58 | export function hydrateSessionExperience(value: unknown): void { |
| 59 | const next = normalize(value); |
| 60 | hydrated = true; |
| 61 | current = next; |
| 62 | writeCompatibilityMirrors(next); |
| 63 | emit(); |
| 64 | emitCompatibilitySignals(next); |
| 65 | } |
| 66 | |
| 67 | export function applySessionExperience(value: SessionExperience): void { |
| 68 | const next = normalize(value); |
| 69 | hydrated = true; |
| 70 | writeCompatibilityMirrors(next); |
| 71 | if (next === current) { |
| 72 | emitCompatibilitySignals(next); |
| 73 | return; |
| 74 | } |
| 75 | for (const listener of beforeChangeListeners) listener(current, next); |
| 76 | current = next; |
| 77 | emit(); |
| 78 | emitCompatibilitySignals(next); |
| 79 | } |
| 80 | |
| 81 | /** Synchronously capture layout state before a mode change updates row |
| 82 | * geometry. Layout owners use this to preserve the reader's logical anchor. */ |
| 83 | export function onSessionExperienceWillChange( |
| 84 | listener: (previous: SessionExperience, next: SessionExperience) => void, |
| 85 | ): () => void { |
| 86 | beforeChangeListeners.add(listener); |
| 87 | return () => beforeChangeListeners.delete(listener); |
| 88 | } |
| 89 | |
| 90 | export function resolveWorkProcessPresentation(value: SessionExperience): WorkProcessPresentation { |
| 91 | return { |
| 92 | experience: value, |
| 93 | showWhileRunning: true, |
| 94 | keepExpandedAfterCompletion: value === "deep", |
| 95 | }; |
| 96 | } |
| 97 | |
| 98 | export function useSessionExperience(): SessionExperience { |
| 99 | return useSyncExternalStore( |
| 100 | (listener) => { |
| 101 | listeners.add(listener); |
| 102 | return () => listeners.delete(listener); |
| 103 | }, |
| 104 | getSessionExperience, |
| 105 | () => "standard", |
| 106 | ); |
| 107 | } |
| 108 | |
| 109 | export function useWorkProcessPresentation(): WorkProcessPresentation { |
| 110 | const experience = useSessionExperience(); |
| 111 | return useMemo(() => resolveWorkProcessPresentation(experience), [experience]); |
| 112 | } |
| 113 |