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import { Part } from '@google/genai';
import { toolRegistry } from '../tools/tool-registry.js';
import {
HistoryItem,
IndividualToolCallDisplay,
ToolCallEvent,
ToolCallStatus,
ToolConfirmationOutcome,
ToolEditConfirmationDetails,
ToolExecuteConfirmationDetails,
} from '../ui/types.js';
import { ToolResultDisplay } from '../tools/tools.js';
/**
* Processes a tool call chunk and updates the history state accordingly.
* Manages adding new tool groups or updating existing ones.
* Resides here as its primary effect is updating history based on tool events.
*/
export const handleToolCallChunk = (
chunk: ToolCallEvent,
setHistory: React.Dispatch<React.SetStateAction<HistoryItem[]>>,
submitQuery: (query: Part) => Promise<void>,
getNextMessageId: () => number,
currentToolGroupIdRef: React.MutableRefObject<number | null>,
): void => {
const toolDefinition = toolRegistry.getTool(chunk.name);
const description = toolDefinition?.getDescription
? toolDefinition.getDescription(chunk.args)
: '';
const toolDisplayName = toolDefinition?.displayName ?? chunk.name;
let confirmationDetails = chunk.confirmationDetails;
if (confirmationDetails) {
const originalConfirmationDetails = confirmationDetails;
const historyUpdatingConfirm = async (outcome: ToolConfirmationOutcome) => {
originalConfirmationDetails.onConfirm(outcome);
if (outcome === ToolConfirmationOutcome.Cancel) {
let resultDisplay: ToolResultDisplay | undefined;
if ('fileDiff' in originalConfirmationDetails) {
resultDisplay = {
fileDiff: (
originalConfirmationDetails as ToolEditConfirmationDetails
).fileDiff,
};
} else {
resultDisplay = `~~${(originalConfirmationDetails as ToolExecuteConfirmationDetails).command}~~`;
}
handleToolCallChunk(
{
...chunk,
status: ToolCallStatus.Canceled,
confirmationDetails: undefined,
resultDisplay,
},
setHistory,
submitQuery,
getNextMessageId,
currentToolGroupIdRef,
);
const functionResponse: Part = {
functionResponse: {
name: chunk.name,
response: { error: 'User rejected function call.' },
},
};
await submitQuery(functionResponse);
} else {
const tool = toolRegistry.getTool(chunk.name);
if (!tool) {
throw new Error(
`Tool "${chunk.name}" not found or is not registered.`,
);
}
handleToolCallChunk(
{
...chunk,
status: ToolCallStatus.Invoked,
resultDisplay: 'Executing...',
confirmationDetails: undefined,
},
setHistory,
submitQuery,
getNextMessageId,
currentToolGroupIdRef,
);
const result = await tool.execute(chunk.args);
handleToolCallChunk(
{
...chunk,
status: ToolCallStatus.Invoked,
resultDisplay: result.returnDisplay,
confirmationDetails: undefined,
},
setHistory,
submitQuery,
getNextMessageId,
currentToolGroupIdRef,
);
const functionResponse: Part = {
functionResponse: {
name: chunk.name,
id: chunk.callId,
response: { output: result.llmContent },
},
};
await submitQuery(functionResponse);
}
};
confirmationDetails = {
...originalConfirmationDetails,
onConfirm: historyUpdatingConfirm,
};
}
const toolDetail: IndividualToolCallDisplay = {
callId: chunk.callId,
name: toolDisplayName,
description,
resultDisplay: chunk.resultDisplay,
status: chunk.status,
confirmationDetails,
};
const activeGroupId = currentToolGroupIdRef.current;
setHistory((prev) => {
if (chunk.status === ToolCallStatus.Pending) {
if (activeGroupId === null) {
// Start a new tool group
const newGroupId = getNextMessageId();
currentToolGroupIdRef.current = newGroupId;
return [
...prev,
{
id: newGroupId,
type: 'tool_group',
tools: [toolDetail],
} as HistoryItem,
];
}
// Add to existing tool group
return prev.map((item) =>
item.id === activeGroupId && item.type === 'tool_group'
? item.tools.some((t) => t.callId === toolDetail.callId)
? item // Tool already listed as pending
: { ...item, tools: [...item.tools, toolDetail] }
: item,
);
}
// Update the status of a pending tool within the active group
if (activeGroupId === null) {
// Log if an invoked tool arrives without an active group context
console.warn(
'Received invoked tool status without an active tool group ID:',
chunk,
);
return prev;
}
return prev.map((item) =>
item.id === activeGroupId && item.type === 'tool_group'
? {
...item,
tools: item.tools.map((t) =>
t.callId === toolDetail.callId
? { ...t, ...toolDetail, status: chunk.status } // Update details & status
: t,
),
}
: item,
);
});
};
/**
* Appends an error or informational message to the history, attempting to attach
* it to the last non-user message or creating a new entry.
*/
export const addErrorMessageToHistory = (
error: DOMException | Error,
setHistory: React.Dispatch<React.SetStateAction<HistoryItem[]>>,
getNextMessageId: () => number,
): void => {
const isAbort = error.name === 'AbortError';
const errorType = isAbort ? 'info' : 'error';
const errorText = isAbort
? '[Request cancelled by user]'
: `[Error: ${error.message || 'Unknown error'}]`;
setHistory((prev) => {
const reversedHistory = [...prev].reverse();
// Find the last message that isn't from the user to append the error/info to
const lastBotMessageIndex = reversedHistory.findIndex(
(item) => item.type !== 'user',
);
const originalIndex =
lastBotMessageIndex !== -1 ? prev.length - 1 - lastBotMessageIndex : -1;
if (originalIndex !== -1) {
// Append error to the last relevant message
return prev.map((item, index) => {
if (index === originalIndex) {
let baseText = '';
// Determine base text based on item type
if (item.type === 'gemini') baseText = item.text ?? '';
else if (item.type === 'tool_group')
baseText = `Tool execution (${item.tools.length} calls)`;
else if (item.type === 'error' || item.type === 'info')
baseText = item.text ?? '';
// Safely handle potential undefined text
const updatedText = (
baseText +
(baseText && !baseText.endsWith('\n') ? '\n' : '') +
errorText
).trim();
// Reuse existing ID, update type and text
return { ...item, type: errorType, text: updatedText };
}
return item;
});
} else {
// No previous message to append to, add a new error item
return [
...prev,
{
id: getNextMessageId(),
type: errorType,
text: errorText,
} as HistoryItem,
];
}
});
};
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