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Passing source here would race the CRDT and duplicate it.\n */\n\nimport { useCallback, useEffect, useMemo, useRef, useState } from \"react\";\nimport { lexicalTheme, markdownShortcutPlugin, MDXEditor } from \"@mdxeditor/editor\";\n\n// Structural editor CSS, then our retheme over the top.\nimport \"@mdxeditor/editor/style.css\";\nimport \"./styles.css\";\nimport { plugins as dialectPlugins } from \"@chopin/dialect\";\n\nimport { ChangeStore } from \"./changes\";\nimport { PlanChanges } from \"./changes-chip\";\nimport { collaborationPlugin } from \"./collaboration\";\nimport { PlanStatus } from \"./status\";\nimport { register } from \"./widgets\";\nimport { widgetsPlugin } from \"./widgets-plugin\";\n\nimport type { Binding } from \"@lexical/yjs\";\nimport type { MDXEditorMethods } from \"@mdxeditor/editor\";\nimport type { Plan } from \"@chopin/protocol\";\nimport type { PlanProvider } from \"./provider\";\nimport type { QuestionnaireStore } from \"./questionnaires\";\nimport type { ThreadStore } from \"./threads\";\nimport type { Connection, Transport } from \"./transport\";\n\n/**\n * Lexical paints remote cursors with inline styles unless the theme names a\n * class for them, and inline styles cannot be restyled from a stylesheet. The\n * classes are how the cursors become ours rather than the library's.\n *\n * The table entries are the same arrangement one step worse: `@lexical/table`\n * paints a selected cell by adding `theme.tableCellSelected` and nothing else,\n * so a theme that does not name one — MDXEditor's does not name any table class\n * at all — draws a cell selection that is completely invisible. Dragging across\n * cells then appears to do nothing while a `TableSelection` is very much live.\n */\nconst THEME = {\n\t...lexicalTheme,\n\tcollaboration: {\n\t\tcursor: \"plan-cursor\",\n\t\tcursorName: \"plan-cursor-name\",\n\t\tselection: \"plan-cursor-selection\",\n\t\tselectionBg: \"plan-cursor-selection-bg\",\n\t},\n\ttableCellSelected: \"plan-cell-selected\",\n\ttableSelection: \"plan-table-selecting\",\n};\n\n// Decorator nodes render through whatever the UI registered, so this has to\n// happen before an editor mounts.\nregister();\n\nexport type PlanEditorProps = {\n\twire: Transport | undefined;\n\tconnection?: Connection;\n\t/** Identity for this client's remote cursor. */\n\tuser: { name: string; color: string };\n\t/** Read-only while an agent turn may be rewriting the plan. */\n\tbusy?: boolean;\n\t/** Read-only because this participant may view but not edit. */\n\treadOnly?: boolean;\n\t/**\n\t * Where the plan's questionnaires are published.\n\t *\n\t * Owned by the host because the pane that answers them renders outside the\n\t * editor, while the observer that finds them has to run inside it.\n\t */\n\tquestions?: QuestionnaireStore;\n\t/** The same arrangement for comment threads. */\n\tthreads?: ThreadStore;\n\t/** Remembered by the document host while this surface is hidden. */\n\tscrollTop?: number;\n\t/** The document host owns persisted view position, not the editor. */\n\tonScrollTop?: (top: number) => void;\n\tclassName?: string;\n};\n\nexport type PlanState = {\n\t/** True once the shared document has been received. */\n\tsynced: boolean;\n\t/** Why the document was last replaced, if it was. */\n\treset?: Plan.Reset[\"reason\"];\n\t/** Why it could not be opened at all, if it could not. */\n\tfailed?: string;\n};\n\nexport function PlanEditor(\n\t{\n\t\tbusy,\n\t\tclassName,\n\t\tconnection,\n\t\tonScrollTop,\n\t\tquestions,\n\t\treadOnly,\n\t\tscrollTop,\n\t\tthreads,\n\t\tuser,\n\t\twire,\n\t}: PlanEditorProps,\n) {\n\tlet ref = useRef(null);\n\tlet scroller = useRef(null);\n\tlet [state, setState] = useState({ synced: false });\n\tlet [generation, setGeneration] = useState(0);\n\tlet provider = useRef(undefined);\n\t// Presence renders, so it needs the provider as state; edits need it\n\t// synchronously during an event, so they keep reading the ref.\n\tlet [presence, setPresence] = useState();\n\tlet previousWire = useRef(wire);\n\t// Nothing outside the editor reads this one, unlike the questionnaires,\n\t// so it is owned here rather than being handed down from the room.\n\tlet [changes] = useState(() => new ChangeStore());\n\n\t// A rotated epoch invalidates the whole local document, so the editor is\n\t// rebuilt rather than reconciled — that is what \"reset\" means. The marks\n\t// describe a history that no longer exists, so they go with it.\n\tlet onReset = useCallback((reason: Plan.Reset[\"reason\"]) => {\n\t\tchanges.clear();\n\t\tsetState(prev => ({ ...prev, synced: false, reset: reason }));\n\t\tsetGeneration(value => value + 1);\n\t}, [changes]);\n\n\t// The store resolves anchors itself, because a Lexical key is per-editor:\n\t// the server's key for a block means nothing in this browser.\n\tlet onBinding = useCallback((value: Binding | undefined) => {\n\t\tquestions?.bind(value);\n\t\tthreads?.bind(value);\n\t\tchanges.bind(value);\n\t}, [questions, threads, changes]);\n\n\tlet onAnchors = useCallback(\n\t\t(snapshot: { widgets: Plan.WidgetAnchors[]; threads: Plan.ThreadAnchors[] }) => {\n\t\t\tquestions?.anchors(snapshot.widgets);\n\t\t\tthreads?.anchors(snapshot.threads);\n\t\t},\n\t\t[questions, threads],\n\t);\n\n\tlet onChanges = useCallback((found: Plan.Change[]) => {\n\t\tchanges.mark(found);\n\t}, [changes]);\n\n\t// The scroll container is what \"in view\" is measured against, and it only\n\t// exists once the editor has rendered.\n\tuseEffect(() => {\n\t\tchanges.viewport(scroller.current ?? undefined);\n\t\tlet element = scroller.current;\n\t\tif (!element) return;\n\t\tlet onScroll = () => {\n\t\t\tchanges.onScroll();\n\t\t\tonScrollTop?.(element.scrollTop);\n\t\t};\n\t\telement.addEventListener(\"scroll\", onScroll, { passive: true });\n\t\treturn () => element.removeEventListener(\"scroll\", onScroll);\n\t}, [changes, generation, onScrollTop, wire]);\n\n\tuseEffect(() => {\n\t\tlet element = scroller.current;\n\t\tif (element && scrollTop !== undefined) element.scrollTop = scrollTop;\n\t}, [generation, scrollTop]);\n\n\tuseEffect(() => () => changes.dispose(), [changes]);\n\n\tlet onProvider = useCallback((value: PlanProvider | undefined) => {\n\t\tprovider.current = value;\n\t\tsetPresence(value);\n\t\tif (!value) return;\n\t\tvalue.on(\"sync\", synced => setState(prev => ({ ...prev, synced })));\n\t\tvalue.on(\"status\", ({ message, status }) => {\n\t\t\t// A failure is sticky until something opens the document; anything\n\t\t\t// else clears it, so a reconnect that works stops saying it failed.\n\t\t\tsetState(prev => ({\n\t\t\t\t...prev,\n\t\t\t\t...(status === \"failed\" ? { failed: message ?? \"the plan could not be opened\" } : {}),\n\t\t\t\t...(status === \"connected\" ? { failed: undefined } : {}),\n\t\t\t}));\n\t\t});\n\t}, []);\n\n\t/*\n\t * Open the document whenever the connection says it can carry the request.\n\t *\n\t * The provider is created when the editor mounts, and a socket comes up on\n\t * its own schedule; nothing makes the two coincide. Opening only on mount\n\t * meant a handshake that had not finished yet cost the plan entirely, and a\n\t * reconnect went unnoticed — leaving the editor unlocked over a document\n\t * quietly missing whatever arrived while it was away.\n\t *\n\t * Keyed on both, so it does not matter which turns up first, and so every\n\t * later reconnection re-syncs.\n\t */\n\tuseEffect(() => {\n\t\tif (connection !== undefined && connection !== \"connected\") return;\n\t\tvoid presence?.resume();\n\t}, [presence, connection]);\n\n\tlet offline = connection !== undefined && connection !== \"connected\";\n\tlet locked = offline || !!busy || !!readOnly || !state.synced;\n\n\t// Empty without a connection, and never used: the editor is not rendered\n\t// at all until there is one, so there is nothing to configure.\n\tlet plugins = useMemo(\n\t\t() =>\n\t\t\twire\n\t\t\t\t? [\n\t\t\t\t\t...dialectPlugins({ core: false }),\n\t\t\t\t\t// After the dialect, not before. It chooses its transformers from\n\t\t\t\t\t// whichever plugins have registered by the time it initialises, so\n\t\t\t\t\t// running first would leave it with inline marks and no headings\n\t\t\t\t\t// or lists — quietly, with no error.\n\t\t\t\t\tmarkdownShortcutPlugin(),\n\t\t\t\t\t/*\n\t\t\t\t\t * Before the widgets, deliberately.\n\t\t\t\t\t *\n\t\t\t\t\t * Plugin order decides the order composer children mount,\n\t\t\t\t\t * which decides the order their update listeners register.\n\t\t\t\t\t * Lexical runs those in one loop with no isolation — the\n\t\t\t\t\t * first to throw skips every listener after it. Behind the\n\t\t\t\t\t * widgets, a bug in any of them costs the author an edit in\n\t\t\t\t\t * silence: the editor commits it, the CRDT never hears, and\n\t\t\t\t\t * the loss only shows when the plan is reopened.\n\t\t\t\t\t *\n\t\t\t\t\t * This buys less than it appears to. MDXEditor's own core\n\t\t\t\t\t * subscribes when the root editor is built, ahead of every\n\t\t\t\t\t * composer child, so nothing here can get in front of it.\n\t\t\t\t\t * Guarding that one is `markdownPlugin`'s job, in the\n\t\t\t\t\t * dialect: keep its serialiser able to write every node, and\n\t\t\t\t\t * it has no reason to throw.\n\t\t\t\t\t */\n\t\t\t\t\tcollaborationPlugin({\n\t\t\t\t\t\twire,\n\t\t\t\t\t\tuser,\n\t\t\t\t\t\tonReset,\n\t\t\t\t\t\tonProvider,\n\t\t\t\t\t\tonBinding,\n\t\t\t\t\t\tonAnchors,\n\t\t\t\t\t\tonChanges,\n\t\t\t\t\t}),\n\t\t\t\t\twidgetsPlugin({\n\t\t\t\t\t\tquestions,\n\t\t\t\t\t\tthreads,\n\t\t\t\t\t\tchanges,\n\t\t\t\t\t\twire,\n\t\t\t\t\t\tconnected: !offline,\n\t\t\t\t\t}),\n\t\t\t\t]\n\t\t\t\t: [],\n\t\t[\n\t\t\twire,\n\t\t\tuser,\n\t\t\tonReset,\n\t\t\tonProvider,\n\t\t\tonBinding,\n\t\t\tonAnchors,\n\t\t\tonChanges,\n\t\t\tquestions,\n\t\t\tthreads,\n\t\t\tchanges,\n\t\t\toffline,\n\t\t],\n\t);\n\n\tuseEffect(() => {\n\t\tif (previousWire.current !== wire) {\n\t\t\tpreviousWire.current = wire;\n\t\t\tsetState({ synced: false });\n\t\t\tsetGeneration(value => value + 1);\n\t\t}\n\t\tif (!wire) setState({ synced: false });\n\t}, [wire]);\n\n\tif (!wire) {\n\t\treturn (\n\t\t\t\n\t\t\t\t

Not connected

\n\t\t\t\t

The plan appears once the room is reachable

\n\t\t\t\n\t\t);\n\t}\n\n\treturn (\n\t\t

\n\t\t\t

\n\t\t\t\t

\n\t\t\t\t\t

\n\t\t\t\t\t\t\n\t\t\t\t\t

\n\t\t\t\t\t{/* In the document column, so they track the prose, not the pane. */}\n\t\t\t\t\t\n\t\t\t\t\t\n\t\t\t\t

\n\t\t\t

\n\t\t

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