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import { Effect } from "effect"
import { SessionEvent } from "./event"
import { SessionMessage } from "./message"
export type MemoryState = {
messages: SessionMessage.Message[]
}
export interface Adapter {
readonly getCurrentAssistant: () => Effect.Effect<SessionMessage.Assistant | undefined>
readonly getAssistant: (messageID: SessionMessage.ID) => Effect.Effect<SessionMessage.Assistant | undefined>
readonly getCurrentShell: (callID: string) => Effect.Effect<SessionMessage.Shell | undefined>
readonly updateAssistant: (assistant: SessionMessage.Assistant) => Effect.Effect<void>
readonly updateShell: (shell: SessionMessage.Shell) => Effect.Effect<void>
readonly appendMessage: (message: SessionMessage.Message) => Effect.Effect<void>
}
export function memory(state: MemoryState): Adapter {
const assistantIndex = (messageID: SessionMessage.ID) =>
state.messages.findLastIndex((message) => message.id === messageID)
// A newer turn supersedes stale incomplete rows; never resume an older assistant projection.
const latestAssistantIndex = () => state.messages.findLastIndex((message) => message.type === "assistant")
const activeShellIndex = (callID: string) =>
state.messages.findLastIndex((message) => message.type === "shell" && message.callID === callID)
return {
getCurrentAssistant() {
return Effect.sync(() => {
const index = latestAssistantIndex()
if (index < 0) return
const assistant = state.messages[index]
return assistant?.type === "assistant" && !assistant.time.completed ? assistant : undefined
})
},
getAssistant(messageID) {
return Effect.sync(() => {
const index = assistantIndex(messageID)
if (index < 0) return
const assistant = state.messages[index]
return assistant?.type === "assistant" ? assistant : undefined
})
},
getCurrentShell(callID) {
return Effect.sync(() => {
const index = activeShellIndex(callID)
if (index < 0) return
const shell = state.messages[index]
return shell?.type === "shell" ? shell : undefined
})
},
updateAssistant(assistant) {
return Effect.sync(() => {
const index = assistantIndex(assistant.id)
if (index < 0) return
const current = state.messages[index]
if (current?.type !== "assistant") return
state.messages[index] = assistant
})
},
updateShell(shell) {
return Effect.sync(() => {
const index = activeShellIndex(shell.callID)
if (index < 0) return
const current = state.messages[index]
if (current?.type !== "shell") return
state.messages[index] = shell
})
},
appendMessage(message) {
return Effect.sync(() => {
state.messages.push(message)
})
},
}
}
export function update(adapter: Adapter, event: SessionEvent.Event) {
type DraftAssistant = WritableDraft<SessionMessage.Assistant>
type DraftTool = WritableDraft<SessionMessage.AssistantTool>
type DraftText = WritableDraft<SessionMessage.AssistantText>
type DraftReasoning = WritableDraft<SessionMessage.AssistantReasoning>
const latestTool = (assistant: DraftAssistant | undefined, callID?: string) =>
assistant?.content.findLast(
(item): item is DraftTool => item.type === "tool" && (callID === undefined || item.id === callID),
)
const latestText = (assistant: DraftAssistant | undefined, textID: string) =>
assistant?.content.findLast((item): item is DraftText => item.type === "text" && item.id === textID)
const latestReasoning = (assistant: DraftAssistant | undefined, reasoningID: string) =>
assistant?.content.findLast((item): item is DraftReasoning => item.type === "reasoning" && item.id === reasoningID)
const updateOwnedAssistant = (messageID: SessionMessage.ID, recipe: (draft: DraftAssistant) => void) =>
Effect.gen(function* () {
const assistant = yield* adapter.getAssistant(messageID)
if (assistant) yield* adapter.updateAssistant(produce(assistant, recipe))
})
return Effect.gen(function* () {
yield* SessionEvent.All.match(event, {
"session.next.agent.switched": (event) => {
return adapter.appendMessage(
SessionMessage.AgentSwitched.make({
id: event.data.messageID,
type: "agent-switched",
metadata: event.metadata,
agent: event.data.agent,
time: { created: event.data.timestamp },
}),
)
},
"session.next.model.switched": (event) => {
return adapter.appendMessage(
SessionMessage.ModelSwitched.make({
id: event.data.messageID,
type: "model-switched",
metadata: event.metadata,
model: event.data.model,
time: { created: event.data.timestamp },
}),
)
},
"session.next.moved": () => Effect.void,
"session.next.prompted": (event) => {
return adapter.appendMessage(
SessionMessage.User.make({
id: event.data.messageID,
type: "user",
metadata: event.metadata,
text: event.data.prompt.text,
files: event.data.prompt.files,
agents: event.data.prompt.agents,
time: { created: event.data.timestamp },
}),
)
},
"session.next.prompt.admitted": () => Effect.void,
"session.next.context.updated": (event) =>
adapter.appendMessage(
SessionMessage.System.make({
id: event.data.messageID,
type: "system",
text: event.data.text,
time: { created: event.data.timestamp },
}),
),
"session.next.synthetic": (event) => {
return adapter.appendMessage(
SessionMessage.Synthetic.make({
sessionID: event.data.sessionID,
text: event.data.text,
id: event.data.messageID,
type: "synthetic",
time: { created: event.data.timestamp },
}),
)
},
"session.next.shell.started": (event) => {
return adapter.appendMessage(
SessionMessage.Shell.make({
id: event.data.messageID,
type: "shell",
metadata: event.metadata,
callID: event.data.callID,
command: event.data.command,
output: "",
time: { created: event.data.timestamp },
}),
)
},
"session.next.shell.ended": (event) => {
return Effect.gen(function* () {
const currentShell = yield* adapter.getCurrentShell(event.data.callID)
if (currentShell) {
yield* adapter.updateShell(
produce(currentShell, (draft) => {
draft.output = event.data.output
draft.time.completed = event.data.timestamp
}),
)
}
})
},
"session.next.step.started": (event) => {
return Effect.gen(function* () {
const currentAssistant = yield* adapter.getCurrentAssistant()
if (currentAssistant) {
yield* adapter.updateAssistant(
produce(currentAssistant, (draft) => {
draft.time.completed = event.data.timestamp
}),
)
}
yield* adapter.appendMessage(
SessionMessage.Assistant.make({
id: event.data.assistantMessageID,
type: "assistant",
agent: event.data.agent,
model: event.data.model,
time: { created: event.data.timestamp },
content: [],
snapshot: event.data.snapshot ? { start: event.data.snapshot } : undefined,
}),
)
})
},
"session.next.step.ended": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
draft.time.completed = event.data.timestamp
draft.finish = event.data.finish
draft.cost = event.data.cost
draft.tokens = event.data.tokens
if (event.data.snapshot || event.data.files)
draft.snapshot = {
...draft.snapshot,
end: event.data.snapshot,
files: event.data.files ? Array.from(event.data.files) : undefined,
}
})
},
"session.next.step.failed": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
draft.time.completed = event.data.timestamp
draft.finish = "error"
draft.error = event.data.error
})
},
"session.next.text.started": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
draft.content.push(
castDraft(SessionMessage.AssistantText.make({ type: "text", id: event.data.textID, text: "" })),
)
})
},
"session.next.text.delta": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
const match = latestText(draft, event.data.textID)
if (match) match.text += event.data.delta
})
},
"session.next.text.ended": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
const match = latestText(draft, event.data.textID)
if (match) match.text = event.data.text
})
},
"session.next.tool.input.started": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
draft.content.push(
castDraft(
SessionMessage.AssistantTool.make({
type: "tool",
id: event.data.callID,
name: event.data.name,
time: { created: event.data.timestamp },
state: SessionMessage.ToolStatePending.make({ status: "pending", input: "" }),
}),
),
)
})
},
"session.next.tool.input.delta": () => Effect.void,
"session.next.tool.input.ended": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
const match = latestTool(draft, event.data.callID)
if (match && match.state.status === "pending") match.state.input = event.data.text
})
},
"session.next.tool.called": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
const match = latestTool(draft, event.data.callID)
if (match) {
match.provider = event.data.provider
match.time.ran = event.data.timestamp
match.state = castDraft(
SessionMessage.ToolStateRunning.make({
status: "running",
input: event.data.input,
structured: {},
content: [],
}),
)
}
})
},
"session.next.tool.progress": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
const match = latestTool(draft, event.data.callID)
if (match && match.state.status === "running") {
match.state.structured = event.data.structured
match.state.content = [...event.data.content]
}
})
},
"session.next.tool.success": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
const match = latestTool(draft, event.data.callID)
if (match && match.state.status === "running") {
match.provider = {
executed: event.data.provider.executed || match.provider?.executed === true,
metadata: match.provider?.metadata,
resultMetadata: event.data.provider.metadata,
}
match.time.completed = event.data.timestamp
match.state = castDraft(
SessionMessage.ToolStateCompleted.make({
status: "completed",
input: match.state.input,
structured: event.data.structured,
content: [...event.data.content],
outputPaths: event.data.outputPaths ? [...event.data.outputPaths] : [],
result: event.data.result,
}),
)
}
})
},
"session.next.tool.failed": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
const match = latestTool(draft, event.data.callID)
if (match && (match.state.status === "pending" || match.state.status === "running")) {
match.provider = {
executed: event.data.provider.executed || match.provider?.executed === true,
metadata: match.provider?.metadata,
resultMetadata: event.data.provider.metadata,
}
match.time.completed = event.data.timestamp
match.state = castDraft(
SessionMessage.ToolStateError.make({
status: "error",
error: event.data.error,
input: typeof match.state.input === "string" ? {} : match.state.input,
structured: match.state.status === "running" ? match.state.structured : {},
content: match.state.status === "running" ? match.state.content : [],
result: event.data.result,
}),
)
}
})
},
"session.next.reasoning.started": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
draft.content.push(
castDraft(
SessionMessage.AssistantReasoning.make({
type: "reasoning",
id: event.data.reasoningID,
text: "",
providerMetadata: event.data.providerMetadata,
time: { created: event.data.timestamp },
}),
),
)
})
},
"session.next.reasoning.delta": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
const match = latestReasoning(draft, event.data.reasoningID)
if (match) match.text += event.data.delta
})
},
"session.next.reasoning.ended": (event) => {
return updateOwnedAssistant(event.data.assistantMessageID, (draft) => {
const match = latestReasoning(draft, event.data.reasoningID)
if (match) {
match.text = event.data.text
match.time = { created: match.time?.created ?? event.data.timestamp, completed: event.data.timestamp }
if (event.data.providerMetadata !== undefined) match.providerMetadata = event.data.providerMetadata
}
})
},
"session.next.retried": () => Effect.void,
"session.next.compaction.started": () => Effect.void,
"session.next.compaction.delta": () => Effect.void,
"session.next.compaction.ended": (event) => {
return adapter.appendMessage(
SessionMessage.Compaction.make({
id: event.data.messageID,
type: "compaction",
metadata: event.metadata,
reason: event.data.reason,
summary: event.data.text,
recent: event.data.recent,
time: { created: event.data.timestamp },
}),
)
},
"session.next.revert.staged": () => Effect.void,
"session.next.revert.cleared": () => Effect.void,
"session.next.revert.committed": () => Effect.void,
})
})
}
export * as SessionMessageUpdater from "./message-updater"
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