[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8,"_9":10,"_11":12},"actionData","errors","root",{"_228":-5,"_231":232,"_233":234},"routes/shell",{"_40":41,"_227":-5,"_228":-5,"_229":230},"routes/repo",{"_33":-7,"_34":35,"_36":37,"_38":39,"_40":41,"_42":31,"_43":31,"_44":31,"_45":31,"_46":31,"_47":31,"_48":49,"_50":49,"_51":31,"_52":-7,"_53":-7,"_54":55,"_56":57,"_58":59,"_60":-5,"_61":62,"_63":64,"_65":66,"_67":68},"routes/repo.blob",{"_13":14,"_15":16,"_17":18,"_19":20,"_21":14,"_22":23,"_24":-5,"_25":26,"_27":28,"_28":29,"_30":31,"_32":14},"ref","5beaeba235ff62d861a1ffb5c4f247c0d98e4d6e","path","packages/editor/src/visual-decision-controller.ts","oid","3f05304a02e0444bfa4201f60b13765c2abad16b","size",5924,"commit","mounts",[],"source","plain",{"_13":14,"_15":16},"kind","text","import { Visual } from \"@chopin/question\";\n\nimport type { VisualDecision } from \"@chopin/protocol\";\nimport type { Transport } from \"./transport\";\n\ntype Edit = { key: string; patch: Partial };\nexport type VisualDecisionSnapshot = {\n\tstate?: VisualDecision.State;\n\tsyncing: boolean;\n\tpending: number;\n\tsaving: boolean;\n\terror?: string;\n};\n\n/** One acknowledged outbox for every mounted view of the same decision. */\nexport class VisualDecisionController {\n\t#snapshot: VisualDecisionSnapshot = { syncing: true, pending: 0, saving: false };\n\t#listeners = new Set<() => void>();\n\t#off?: () => void;\n\t#connected = false;\n\t#generation = 0;\n\t#queue: Edit[] = [];\n\t#sending = false;\n\t#blocked = false;\n\t#client = crypto.randomUUID();\n\t#sequence = 0;\n\n\tconstructor(private wire: Transport | undefined, private id: string) {}\n\n\tgetSnapshot = (): VisualDecisionSnapshot => this.#snapshot;\n\n\tsubscribe = (listener: () => void): () => void => {\n\t\tthis.#listeners.add(listener);\n\t\tif (!this.#off && this.wire) {\n\t\t\tthis.#off = this.wire.on<{ state: VisualDecision.State }>(\n\t\t\t\t\"visual-decision:changed\",\n\t\t\t\tframe => this.#accept(frame.state),\n\t\t\t);\n\t\t}\n\t\treturn () => {\n\t\t\tthis.#listeners.delete(listener);\n\t\t\tif (!this.#listeners.size) {\n\t\t\t\tthis.#off?.();\n\t\t\t\tthis.#off = undefined;\n\t\t\t\tthis.configure(false);\n\t\t\t}\n\t\t};\n\t};\n\n\tconfigure(connected: boolean): void {\n\t\tconnected = connected && !!this.wire && this.wire.connected !== false;\n\t\tif (this.#connected === connected) return;\n\t\tthis.#connected = connected;\n\t\tthis.#generation++;\n\t\tthis.#sending = false;\n\t\tthis.#set({ syncing: true, saving: false });\n\t\tif (connected) void this.#open();\n\t}\n\n\tchange = (raw: Partial): void => {\n\t\tif (!this.#editable()) return;\n\t\tlet patch: Partial;\n\t\ttry {\n\t\t\tpatch = Visual.patch(raw);\n\t\t} catch (error) {\n\t\t\tthis.#set({ error: error instanceof Error ? error.message : \"Check the control value.\" });\n\t\t\treturn;\n\t\t}\n\t\tthis.#queue.push({ key: `${this.#client}:${++this.#sequence}`, patch });\n\t\tthis.#blocked = false;\n\t\tthis.#set({ pending: this.#queue.length, error: undefined });\n\t\tvoid this.#flush();\n\t};\n\n\treset = (): void => {\n\t\tlet baseline = this.#snapshot.state?.definition.baseline;\n\t\tif (baseline) this.change(baseline);\n\t};\n\n\tretry = (): void => {\n\t\tif (!this.#connected) return;\n\t\tthis.#blocked = false;\n\t\tthis.#set({ error: undefined });\n\t\tif (this.#snapshot.syncing) void this.#open();\n\t\telse void this.#flush();\n\t};\n\n\tsave = async (): Promise => {\n\t\tlet state = this.#snapshot.state;\n\t\tif (!state || !this.#editable() || this.#queue.length) return;\n\t\tlet generation = this.#generation;\n\t\tthis.#set({ saving: true, error: undefined });\n\t\ttry {\n\t\t\tlet result = await this.wire!.ask(\"visual-decision:save\", {\n\t\t\t\tid: this.id,\n\t\t\t\trevision: state.revision,\n\t\t\t});\n\t\t\tif (generation !== this.#generation) return;\n\t\t\tif (result.state) this.#accept(result.state);\n\t\t\tif (!result.ok) {\n\t\t\t\tthis.#set({\n\t\t\t\t\terror: result.reason === \"stale\"\n\t\t\t\t\t\t? \"The draft changed. Review the latest values, then save again.\"\n\t\t\t\t\t\t: result.message ?? \"This decision could not be saved. Try again.\",\n\t\t\t\t});\n\t\t\t}\n\t\t} catch {\n\t\t\tif (generation === this.#generation) {\n\t\t\t\tthis.#set({ error: \"This decision could not be saved. Try again.\" });\n\t\t\t}\n\t\t} finally {\n\t\t\tif (generation === this.#generation) this.#set({ saving: false });\n\t\t}\n\t};\n\n\t#editable(): boolean {\n\t\treturn this.#connected && !this.#snapshot.syncing && !this.#snapshot.saving\n\t\t\t&& !!this.#snapshot.state && !this.#snapshot.state.saved;\n\t}\n\n\tasync #open(): Promise {\n\t\tlet generation = this.#generation;\n\t\ttry {\n\t\t\tlet result = await this.wire!.ask(\"visual-decision:open\", {\n\t\t\t\tid: this.id,\n\t\t\t});\n\t\t\tif (generation !== this.#generation) return;\n\t\t\tif (!result.ok) throw new Error(\"Could not open decision\");\n\t\t\tthis.#accept(result.state);\n\t\t\tthis.#blocked = false;\n\t\t\tthis.#set({ syncing: false, error: undefined });\n\t\t\tvoid this.#flush();\n\t\t} catch {\n\t\t\tif (generation === this.#generation) {\n\t\t\t\tthis.#set({ error: \"The shared draft could not be loaded. Try again.\" });\n\t\t\t}\n\t\t}\n\t}\n\n\tasync #flush(): Promise {\n\t\tif (!this.#editable() || this.#sending || this.#blocked) return;\n\t\tlet edit = this.#queue[0];\n\t\tif (!edit) return;\n\t\tthis.#sending = true;\n\t\tlet generation = this.#generation;\n\t\ttry {\n\t\t\tlet result = await this.wire!.ask(\"visual-decision:edit\", {\n\t\t\t\tid: this.id,\n\t\t\t\t...edit,\n\t\t\t});\n\t\t\tif (generation !== this.#generation) return;\n\t\t\tif (result.state) this.#accept(result.state);\n\t\t\tif (!result.ok) {\n\t\t\t\tif (result.reason === \"saved\") this.#queue = [];\n\t\t\t\tthis.#blocked = true;\n\t\t\t\tthis.#set({\n\t\t\t\t\tpending: this.#queue.length,\n\t\t\t\t\terror: result.message ?? \"The change was not accepted. Try again.\",\n\t\t\t\t});\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t// An accepted broadcast is not an acknowledgement of this particular edit.\n\t\t\tif (this.#queue[0]?.key === edit.key) this.#queue.shift();\n\t\t\tthis.#set({ pending: this.#queue.length });\n\t\t} catch {\n\t\t\tif (generation !== this.#generation) return;\n\t\t\tthis.#blocked = true;\n\t\t\tthis.#set({ error: \"The change is waiting to sync. Try again when connected.\" });\n\t\t} finally {\n\t\t\tif (generation === this.#generation) {\n\t\t\t\tthis.#sending = false;\n\t\t\t\tvoid this.#flush();\n\t\t\t}\n\t\t}\n\t}\n\n\t#accept(raw: VisualDecision.State): void {\n\t\tif (raw.id !== this.id) return;\n\t\tlet state = Visual.state(raw);\n\t\tlet previous = this.#snapshot.state;\n\t\tif (previous && state.revision < previous.revision) return;\n\t\tif (previous?.saved && !state.saved) return;\n\t\tif (state.saved) this.#queue = [];\n\t\tthis.#set({\n\t\t\tstate,\n\t\t\tpending: this.#queue.length,\n\t\t\t...(previous && state.revision > previous.revision ? { error: undefined } : {}),\n\t\t});\n\t}\n\n\t#set(change: Partial): void {\n\t\tthis.#snapshot = { ...this.#snapshot, ...change };\n\t\tfor (let listener of this.#listeners) 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