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import type { ChatMessage, Chunk, StoredChunk, TurnProviderRetryEvent } from "@dispatch/wire";
import type { ProvisionalChunk, RenderedChunk, TranscriptState } from "./types";
/**
* Whether a provisional chunk is the same content as a committed chunk at the
* same position of the same turn (identity for de-dup, not deep equality).
* Tool chunks match by `toolCallId`; text-bearing chunks by exact text.
*/
function sameChunk(p: ProvisionalChunk, c: StoredChunk): boolean {
if (p.role !== c.role || p.chunk.type !== c.chunk.type) return false;
const a = p.chunk;
const b = c.chunk;
switch (a.type) {
case "tool-call":
case "tool-result":
return a.toolCallId === (b as typeof a).toolCallId;
case "text":
case "thinking":
case "system":
return a.text === (b as typeof a).text;
case "error":
return a.message === (b as typeof a).message;
case "image":
return true;
}
}
/**
* How many LEADING provisional chunks are already backed by committed chunks.
*
* The backend persists each step of an in-flight turn as it completes (CR-6),
* so a client that opens a conversation mid-turn gets those steps from history
* AND again from the late-join event replay (as provisional chunks). Both
* carry the turn's chunks in the same order, so the provisional run of turn T
* is aligned position-by-position with the committed run of turn T. Skip the
* aligned prefix; stop at the first mismatch (fail-safe: a misalignment shows
* a duplicate, never hides content).
*
* Also reports whether the ACCUMULATING chunk is already committed (the step
* completed + history synced, but the next live event hasn't flushed it yet).
*/
function committedOverlap(state: TranscriptState): { skip: number; hideAccumulating: boolean } {
const first = state.provisional[0];
const turnId = first?.turnId ?? state.accumulating?.turnId;
if (turnId === undefined) return { skip: 0, hideAccumulating: false };
// The committed run for this turn (contiguous at the tail of `committed`).
let start = state.committed.length;
while (start > 0 && state.committed[start - 1]?.turnId === turnId) start--;
const run = state.committed.length - start;
if (run === 0) return { skip: 0, hideAccumulating: false };
let skip = 0;
while (skip < state.provisional.length && skip < run) {
const p = state.provisional[skip];
const c = state.committed[start + skip];
if (p === undefined || c === undefined || p.turnId !== turnId || !sameChunk(p, c)) break;
skip++;
}
let hideAccumulating = false;
const acc = state.accumulating;
if (acc !== null && skip === state.provisional.length && skip < run) {
const c = state.committed[start + skip];
hideAccumulating =
c !== undefined &&
c.role === "assistant" &&
c.chunk.type === acc.kind &&
c.chunk.text === acc.text;
}
return { skip, hideAccumulating };
}
/**
* Select all chunks for rendering: committed first (seq order),
* then provisional (seq: null) — minus provisional chunks already backed by
* committed history (see `committedOverlap`).
*/
export function selectChunks(state: TranscriptState): readonly RenderedChunk[] {
const result: RenderedChunk[] = [];
const { skip, hideAccumulating } = committedOverlap(state);
for (const c of state.committed) {
result.push(
c.turnId !== undefined
? { seq: c.seq, role: c.role, chunk: c.chunk, provisional: false, turnId: c.turnId }
: { seq: c.seq, role: c.role, chunk: c.chunk, provisional: false },
);
}
for (let i = skip; i < state.provisional.length; i++) {
const p = state.provisional[i];
if (p === undefined) continue;
result.push(
p.turnId !== undefined
? { seq: null, role: p.role, chunk: p.chunk, provisional: true, turnId: p.turnId }
: { seq: null, role: p.role, chunk: p.chunk, provisional: true },
);
}
const acc = state.accumulating;
if (acc !== null && !hideAccumulating) {
const chunk: Chunk =
acc.kind === "text" ? { type: "text", text: acc.text } : { type: "thinking", text: acc.text };
result.push({
seq: null,
role: "assistant",
chunk,
provisional: true,
streaming: true,
...(acc.turnId !== undefined ? { turnId: acc.turnId } : {}),
});
}
return result;
}
/**
* Whether a turn is currently generating (for a "generating…" indicator). True
* for ANY client watching the conversation — the sender, a second device, or a
* reconnected client whose in-flight turn was replayed.
*/
export function selectGenerating(state: TranscriptState): boolean {
return state.generating;
}
/**
* The latest `provider-retry` event for the current turn, or `null` when no retry
* is pending. Drives the transient yellow "retrying…" warning banner (rendered
* by ChatView). Never persisted — see `TranscriptState.providerRetry`.
*/
export function selectProviderRetry(state: TranscriptState): TurnProviderRetryEvent | null {
return state.providerRetry;
}
/**
* Group consecutive same-role rendered chunks into ChatMessages.
*/
export function selectMessages(state: TranscriptState): readonly ChatMessage[] {
const rendered = selectChunks(state);
const first = rendered[0];
if (first === undefined) return [];
const messages: ChatMessage[] = [];
let role = first.role;
let chunks: Chunk[] = [first.chunk];
for (let i = 1; i < rendered.length; i++) {
const rc = rendered[i];
if (rc === undefined) continue;
if (rc.role === role) {
chunks.push(rc.chunk);
} else {
messages.push({ role, chunks });
role = rc.role;
chunks = [rc.chunk];
}
}
messages.push({ role, chunks });
return messages;
}
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