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import type { AgentEvent, StepId, StoredChunk } from "@dispatch/wire";
import { describe, expect, it } from "vitest";
import { applyHistory, foldEvent, initialState, markHistoryRecovering } from "./reducer";
import { selectChunks } from "./selectors";
import type { TranscriptState } from "./types";
const C = "conv";
const T = "turn-1";
function fold(state: TranscriptState, events: readonly AgentEvent[]): TranscriptState {
return events.reduce(foldEvent, state);
}
const turnStart: AgentEvent = { type: "turn-start", conversationId: C, turnId: T };
const userMsg: AgentEvent = { type: "user-message", conversationId: C, turnId: T, text: "hi" };
const think = (delta: string): AgentEvent => ({
type: "reasoning-delta",
conversationId: C,
turnId: T,
delta,
});
const text = (delta: string): AgentEvent => ({
type: "text-delta",
conversationId: C,
turnId: T,
delta,
});
const call = (id: string, step = 0): AgentEvent => ({
type: "tool-call",
conversationId: C,
turnId: T,
stepId: `${T}#${step}` as StepId,
toolCallId: id,
toolName: "run_shell",
input: {},
});
const result = (id: string, step = 0): AgentEvent => ({
type: "tool-result",
conversationId: C,
turnId: T,
stepId: `${T}#${step}` as StepId,
toolCallId: id,
toolName: "run_shell",
content: "ok",
isError: false,
});
/** The persisted chunks for steps 0 (user + think + call/result). */
const committedStep0: StoredChunk[] = [
{ seq: 1, role: "user", chunk: { type: "text", text: "hi" }, turnId: T },
{ seq: 2, role: "assistant", chunk: { type: "thinking", text: "plan" }, turnId: T },
{
seq: 3,
role: "assistant",
chunk: {
type: "tool-call",
toolCallId: "a",
toolName: "run_shell",
input: {},
stepId: `${T}#0` as StepId,
},
turnId: T,
},
{
seq: 4,
role: "tool",
chunk: {
type: "tool-result",
toolCallId: "a",
toolName: "run_shell",
content: "ok",
isError: false,
stepId: `${T}#0` as StepId,
},
turnId: T,
},
];
describe("selectChunks — de-dup of a late-join replay against committed history", () => {
it("hides replayed provisional chunks already persisted for the in-flight turn", () => {
// Fresh load mid-turn: history has step 0; the replay re-delivers step 0
// and then step 1 (still streaming).
let s = applyHistory(initialState(), committedStep0);
s = fold(s, [
userMsg,
turnStart,
think("pl"),
think("an"),
call("a"),
result("a"),
text("now"),
]);
const rendered = selectChunks(s);
expect(rendered.map((r) => [r.seq, r.chunk.type])).toEqual([
[1, "text"],
[2, "thinking"],
[3, "tool-call"],
[4, "tool-result"],
[null, "text"],
]);
expect(rendered[4]?.streaming).toBe(true);
});
it("keeps provisional chunks beyond the committed run", () => {
let s = applyHistory(initialState(), committedStep0);
s = fold(s, [userMsg, turnStart, think("plan"), call("a"), result("a"), call("b", 1)]);
const rendered = selectChunks(s);
expect(rendered).toHaveLength(5);
expect(rendered[4]?.chunk).toMatchObject({ type: "tool-call", toolCallId: "b" });
expect(rendered[4]?.provisional).toBe(true);
});
it("hides the accumulating chunk once its content is committed", () => {
const committed: StoredChunk[] = [
...committedStep0,
{ seq: 5, role: "assistant", chunk: { type: "text", text: "final" }, turnId: T },
];
let s = applyHistory(initialState(), committed);
s = fold(s, [userMsg, turnStart, think("plan"), call("a"), result("a"), text("final")]);
const rendered = selectChunks(s);
expect(rendered).toHaveLength(5);
expect(rendered.every((r) => !r.provisional)).toBe(true);
});
it("stops de-duping at the first mismatch (never hides divergent content)", () => {
let s = applyHistory(initialState(), committedStep0);
s = fold(s, [userMsg, turnStart, think("DIFFERENT"), call("a"), result("a")]);
const rendered = selectChunks(s);
// user echo matched (1 hidden); everything from the mismatch on is shown.
expect(rendered.filter((r) => r.provisional)).toHaveLength(3);
});
it("preserves an uncommitted accumulating tail even when its text repeats history", () => {
const committed: StoredChunk[] = [
...committedStep0,
{ seq: 5, role: "assistant", chunk: { type: "text", text: "final" }, turnId: T },
];
let s = applyHistory(initialState(), committed);
s = markHistoryRecovering(s, T);
s = fold(s, [userMsg, turnStart, think("plan"), call("a"), result("a"), text("final")]);
const rendered = selectChunks(s);
expect(rendered).toHaveLength(6);
expect(rendered.slice(0, 5).every((r) => !r.provisional)).toBe(true);
expect(rendered[5]).toMatchObject({
provisional: true,
streaming: true,
chunk: { type: "text", text: "final" },
});
});
it("reconciles the same step identity even when provisional payload differs", () => {
let s = applyHistory(initialState(), committedStep0);
s = markHistoryRecovering(s, T);
s = fold(s, [userMsg, turnStart, think("DIFFERENT"), call("a"), result("a")]);
const rendered = selectChunks(s);
// Authoritative identity wins; payload equality cannot identify omitted/truncated content.
expect(rendered.filter((r) => r.provisional)).toHaveLength(0);
expect(rendered.map((r) => r.chunk)).toEqual(committedStep0.map((r) => r.chunk));
});
it("does nothing when the committed tail belongs to another turn", () => {
const other = committedStep0.map((c) => ({ ...c, turnId: "older" }));
let s = applyHistory(initialState(), other);
s = fold(s, [userMsg, turnStart, think("plan")]);
expect(selectChunks(s).filter((r) => r.provisional)).toHaveLength(2);
});
it("is the identity when there is no committed history", () => {
const s = fold(initialState(), [userMsg, turnStart, text("hello")]);
expect(selectChunks(s)).toHaveLength(2);
});
});
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