Roo-Code/webview-ui/src/utilities/combineApiRequests.ts

import { ClaudeMessage } from "@shared/ExtensionMessage"

/**
 * Combines API request start and finish messages in an array of ClaudeMessages.
 * 
 * This function looks for pairs of 'api_req_started' and 'api_req_finished' messages.
 * When it finds a pair, it combines them into a single 'api_req_combined' message.
 * The JSON data in the text fields of both messages are merged.
 * 
 * @param messages - An array of ClaudeMessage objects to process.
 * @returns A new array of ClaudeMessage objects with API requests combined.
 * 
 * @example
 * const messages = [
 *   { type: "say", say: "api_req_started", text: '{"request":"GET /api/data"}', ts: 1000 },
 *   { type: "say", say: "api_req_finished", text: '{"cost":0.005}', ts: 1001 }
 * ];
 * const result = combineApiRequests(messages);
 * // Result: [{ type: "say", say: "api_req_started", text: '{"request":"GET /api/data","cost":0.005}', ts: 1000 }]
 */
export function combineApiRequests(messages: ClaudeMessage[]): ClaudeMessage[] {
	const combinedApiRequests: ClaudeMessage[] = []

	for (let i = 0; i < messages.length; i++) {
		if (messages[i].type === "say" && messages[i].say === "api_req_started") {
			let startedRequest = JSON.parse(messages[i].text || "{}")
			let j = i + 1

			while (j < messages.length) {
				if (messages[j].type === "say" && messages[j].say === "api_req_finished") {
					let finishedRequest = JSON.parse(messages[j].text || "{}")
					let combinedRequest = { ...startedRequest, ...finishedRequest }

					combinedApiRequests.push({
						...messages[i],
						text: JSON.stringify(combinedRequest),
					})

					i = j // Skip to the api_req_finished message
					break
				}
				j++
			}

			if (j === messages.length) {
				// If no matching api_req_finished found, keep the original api_req_started
				combinedApiRequests.push(messages[i])
			}
		}
	}

	// Replace original api_req_started and remove api_req_finished
	return messages
		.filter((msg) => !(msg.type === "say" && msg.say === "api_req_finished"))
		.map((msg) => {
			if (msg.type === "say" && msg.say === "api_req_started") {
				const combinedRequest = combinedApiRequests.find((req) => req.ts === msg.ts)
				return combinedRequest || msg
			}
			return msg
		})
}