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import { describe, expect, test } from "bun:test"
import type { Message, Part } from "@opencode-ai/sdk/v2/client"
import { applyOptimisticAdd, applyOptimisticRemove, mergeOptimisticPage } from "./sync"
type Text = Extract<Part, { type: "text" }>
const userMessage = (id: string, sessionID: string): Message => ({
id,
sessionID,
role: "user",
time: { created: 1 },
agent: "assistant",
model: { providerID: "openai", modelID: "gpt" },
})
const textPart = (id: string, sessionID: string, messageID: string): Text => ({
id,
sessionID,
messageID,
type: "text",
text: id,
})
describe("sync optimistic reducers", () => {
test("applyOptimisticAdd inserts message in sorted order and stores parts", () => {
const sessionID = "ses_1"
const draft = {
message: { [sessionID]: [userMessage("msg_2", sessionID)] },
part: {} as Record<string, Part[] | undefined>,
}
applyOptimisticAdd(draft, {
sessionID,
message: userMessage("msg_1", sessionID),
parts: [textPart("prt_2", sessionID, "msg_1"), textPart("prt_1", sessionID, "msg_1")],
})
expect(draft.message[sessionID]?.map((x) => x.id)).toEqual(["msg_1", "msg_2"])
expect(draft.part.msg_1?.map((x) => x.id)).toEqual(["prt_1", "prt_2"])
})
test("applyOptimisticRemove removes message and part entries", () => {
const sessionID = "ses_1"
const draft = {
message: { [sessionID]: [userMessage("msg_1", sessionID), userMessage("msg_2", sessionID)] },
part: {
msg_1: [textPart("prt_1", sessionID, "msg_1")],
msg_2: [textPart("prt_2", sessionID, "msg_2")],
} as Record<string, Part[] | undefined>,
}
applyOptimisticRemove(draft, { sessionID, messageID: "msg_1" })
expect(draft.message[sessionID]?.map((x) => x.id)).toEqual(["msg_2"])
expect(draft.part.msg_1).toBeUndefined()
expect(draft.part.msg_2).toHaveLength(1)
})
test("mergeOptimisticPage keeps pending messages in fetched timelines", () => {
const sessionID = "ses_1"
const page = mergeOptimisticPage(
{
session: [userMessage("msg_1", sessionID)],
part: [{ id: "msg_1", part: [textPart("prt_1", sessionID, "msg_1")] }],
complete: true,
},
[{ message: userMessage("msg_2", sessionID), parts: [textPart("prt_2", sessionID, "msg_2")] }],
)
expect(page.session.map((x) => x.id)).toEqual(["msg_1", "msg_2"])
expect(page.part.find((x) => x.id === "msg_2")?.part.map((x) => x.id)).toEqual(["prt_2"])
expect(page.confirmed).toEqual([])
expect(page.complete).toBe(true)
})
test("mergeOptimisticPage keeps missing optimistic parts until the server has them", () => {
const sessionID = "ses_1"
const page = mergeOptimisticPage(
{
session: [userMessage("msg_2", sessionID)],
part: [{ id: "msg_2", part: [textPart("prt_2", sessionID, "msg_2")] }],
complete: true,
},
[
{
message: userMessage("msg_2", sessionID),
parts: [textPart("prt_1", sessionID, "msg_2"), textPart("prt_2", sessionID, "msg_2")],
},
],
)
expect(page.part.find((x) => x.id === "msg_2")?.part.map((x) => x.id)).toEqual(["prt_1", "prt_2"])
expect(page.confirmed).toEqual([])
})
test("mergeOptimisticPage confirms echoed messages once all parts arrive", () => {
const sessionID = "ses_1"
const page = mergeOptimisticPage(
{
session: [userMessage("msg_2", sessionID)],
part: [
{
id: "msg_2",
part: [{ ...textPart("prt_1", sessionID, "msg_2"), text: "server" }, textPart("prt_2", sessionID, "msg_2")],
},
],
complete: true,
},
[
{
message: userMessage("msg_2", sessionID),
parts: [textPart("prt_1", sessionID, "msg_2"), textPart("prt_2", sessionID, "msg_2")],
},
],
)
expect(page.confirmed).toEqual(["msg_2"])
expect(page.part.find((x) => x.id === "msg_2")?.part).toMatchObject([
{ id: "prt_1", type: "text", text: "server" },
{ id: "prt_2", type: "text", text: "prt_2" },
])
})
})
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