oh-my-pi/packages/coding-agent/src/modes/controllers/event-controller.ts

import { INTENT_FIELD } from "@oh-my-pi/pi-agent-core";
import type { ImageContent } from "@oh-my-pi/pi-ai";
import { Loader, TERMINAL, Text } from "@oh-my-pi/pi-tui";
import { settings } from "../../config/settings";
import { AssistantMessageComponent } from "../../modes/components/assistant-message";
import { ReadToolGroupComponent } from "../../modes/components/read-tool-group";
import { TodoReminderComponent } from "../../modes/components/todo-reminder";
import { ToolExecutionComponent } from "../../modes/components/tool-execution";
import { TtsrNotificationComponent } from "../../modes/components/ttsr-notification";
import { getSymbolTheme, theme } from "../../modes/theme/theme";
import type { InteractiveModeContext, TodoPhase } from "../../modes/types";
import type { AgentSessionEvent } from "../../session/agent-session";
import type { ExitPlanModeDetails } from "../../tools";

export class EventController {
	#lastReadGroup: ReadToolGroupComponent | undefined = undefined;
	#lastThinkingCount = 0;
	#renderedCustomMessages = new Set<string>();
	#lastIntent: string | undefined = undefined;
	#backgroundToolCallIds = new Set<string>();
	#readToolCallArgs = new Map<string, Record<string, unknown>>();
	#readToolCallAssistantComponents = new Map<string, AssistantMessageComponent>();
	#lastAssistantComponent: AssistantMessageComponent | undefined = undefined;
	constructor(private ctx: InteractiveModeContext) {}

	#resetReadGroup(): void {
		this.#lastReadGroup = undefined;
	}

	#getReadGroup(): ReadToolGroupComponent {
		if (!this.#lastReadGroup) {
			this.ctx.chatContainer.addChild(new Text("", 0, 0));
			const group = new ReadToolGroupComponent();
			group.setExpanded(this.ctx.toolOutputExpanded);
			this.ctx.chatContainer.addChild(group);
			this.#lastReadGroup = group;
		}
		return this.#lastReadGroup;
	}

	#trackReadToolCall(toolCallId: string, args: unknown): void {
		if (!toolCallId) return;
		const normalizedArgs =
			args && typeof args === "object" && !Array.isArray(args) ? (args as Record<string, unknown>) : {};
		this.#readToolCallArgs.set(toolCallId, normalizedArgs);
		const assistantComponent = this.ctx.streamingComponent ?? this.#lastAssistantComponent;
		if (assistantComponent) {
			this.#readToolCallAssistantComponents.set(toolCallId, assistantComponent);
		}
	}

	#clearReadToolCall(toolCallId: string): void {
		this.#readToolCallArgs.delete(toolCallId);
		this.#readToolCallAssistantComponents.delete(toolCallId);
	}

	#inlineReadToolImages(
		toolCallId: string,
		result: { content: Array<{ type: string; data?: string; mimeType?: string }> },
	): boolean {
		if (!settings.get("terminal.showImages")) return false;
		const assistantComponent = this.#readToolCallAssistantComponents.get(toolCallId);
		if (!assistantComponent) return false;
		const images: ImageContent[] = result.content
			.filter(
				(content): content is ImageContent =>
					content.type === "image" && typeof content.data === "string" && typeof content.mimeType === "string",
			)
			.map(content => ({ type: "image", data: content.data, mimeType: content.mimeType }));
		if (images.length === 0) return false;
		assistantComponent.setToolResultImages(toolCallId, images);
		return true;
	}
	#updateWorkingMessageFromIntent(intent: string | undefined): void {
		const trimmed = intent?.trim();
		if (!trimmed || trimmed === this.#lastIntent) return;
		this.#lastIntent = trimmed;
		this.ctx.setWorkingMessage(`${trimmed} (esc to interrupt)`);
	}

	subscribeToAgent(): void {
		this.ctx.unsubscribe = this.ctx.session.subscribe(async (event: AgentSessionEvent) => {
			await this.handleEvent(event);
		});
	}

	async handleEvent(event: AgentSessionEvent): Promise<void> {
		if (!this.ctx.isInitialized) {
			await this.ctx.init();
		}

		this.ctx.statusLine.invalidate();
		this.ctx.updateEditorTopBorder();

		switch (event.type) {
			case "agent_start":
				this.#lastIntent = undefined;
				this.#readToolCallArgs.clear();
				this.#readToolCallAssistantComponents.clear();
				this.#lastAssistantComponent = undefined;
				if (this.ctx.retryEscapeHandler) {
					this.ctx.editor.onEscape = this.ctx.retryEscapeHandler;
					this.ctx.retryEscapeHandler = undefined;
				}
				if (this.ctx.retryLoader) {
					this.ctx.retryLoader.stop();
					this.ctx.retryLoader = undefined;
					this.ctx.statusContainer.clear();
				}
				this.ctx.ensureLoadingAnimation();
				this.ctx.ui.requestRender();
				break;

			case "message_start":
				if (event.message.role === "hookMessage" || event.message.role === "custom") {
					const signature = `${event.message.role}:${event.message.customType}:${event.message.timestamp}`;
					if (this.#renderedCustomMessages.has(signature)) {
						break;
					}
					this.#renderedCustomMessages.add(signature);
					this.#resetReadGroup();
					this.ctx.addMessageToChat(event.message);
					this.ctx.ui.requestRender();
				} else if (event.message.role === "user") {
					const textContent = this.ctx.getUserMessageText(event.message);
					const imageCount =
						typeof event.message.content === "string"
							? 0
							: event.message.content.filter(content => content.type === "image").length;
					const signature = `${textContent}\u0000${imageCount}`;

					this.#resetReadGroup();
					if (this.ctx.optimisticUserMessageSignature !== signature) {
						this.ctx.addMessageToChat(event.message);
					}
					this.ctx.optimisticUserMessageSignature = undefined;

					if (!event.message.synthetic) {
						this.ctx.editor.setText("");
						this.ctx.updatePendingMessagesDisplay();
					}
					this.ctx.ui.requestRender();
				} else if (event.message.role === "fileMention") {
					this.#resetReadGroup();
					this.ctx.addMessageToChat(event.message);
					this.ctx.ui.requestRender();
				} else if (event.message.role === "assistant") {
					this.#lastThinkingCount = 0;
					this.#resetReadGroup();
					this.ctx.streamingComponent = new AssistantMessageComponent(undefined, this.ctx.hideThinkingBlock);
					this.ctx.streamingMessage = event.message;
					this.ctx.chatContainer.addChild(this.ctx.streamingComponent);
					this.ctx.streamingComponent.updateContent(this.ctx.streamingMessage);
					this.ctx.ui.requestRender();
				}
				break;

			case "message_update":
				if (this.ctx.streamingComponent && event.message.role === "assistant") {
					this.ctx.streamingMessage = event.message;
					this.ctx.streamingComponent.updateContent(this.ctx.streamingMessage);

					const thinkingCount = this.ctx.streamingMessage.content.filter(
						content => content.type === "thinking" && content.thinking.trim(),
					).length;
					if (thinkingCount > this.#lastThinkingCount) {
						this.#resetReadGroup();
						this.#lastThinkingCount = thinkingCount;
					}

					for (const content of this.ctx.streamingMessage.content) {
						if (content.type !== "toolCall") continue;
						if (content.name === "read") {
							this.#trackReadToolCall(content.id, content.arguments);
							const component = this.ctx.pendingTools.get(content.id);
							if (component) {
								component.updateArgs(content.arguments, content.id);
							} else {
								const group = this.#getReadGroup();
								group.updateArgs(content.arguments, content.id);
								this.ctx.pendingTools.set(content.id, group);
							}
							continue;
						}

						// Preserve the raw partial JSON for renderers that need to surface fields before the JSON object closes.
						// Bash uses this to show inline env assignments during streaming instead of popping them in at completion.
						const renderArgs =
							"partialJson" in content
								? { ...content.arguments, __partialJson: content.partialJson }
								: content.arguments;
						if (!this.ctx.pendingTools.has(content.id)) {
							this.#resetReadGroup();
							this.ctx.chatContainer.addChild(new Text("", 0, 0));
							const tool = this.ctx.session.getToolByName(content.name);
							const component = new ToolExecutionComponent(
								content.name,
								renderArgs,
								{
									showImages: settings.get("terminal.showImages"),
									editFuzzyThreshold: settings.get("edit.fuzzyThreshold"),
									editAllowFuzzy: settings.get("edit.fuzzyMatch"),
								},
								tool,
								this.ctx.ui,
								this.ctx.sessionManager.getCwd(),
							);
							component.setExpanded(this.ctx.toolOutputExpanded);
							this.ctx.chatContainer.addChild(component);
							this.ctx.pendingTools.set(content.id, component);
						} else {
							const component = this.ctx.pendingTools.get(content.id);
							if (component) {
								component.updateArgs(renderArgs, content.id);
							}
						}
					}

					// Update working message with intent from streamed tool arguments
					for (const content of this.ctx.streamingMessage.content) {
						if (content.type !== "toolCall") continue;
						const args = content.arguments;
						if (!args || typeof args !== "object" || !(INTENT_FIELD in args)) continue;
						this.#updateWorkingMessageFromIntent(args[INTENT_FIELD] as string | undefined);
					}

					this.ctx.ui.requestRender();
				}
				break;

			case "message_end":
				if (event.message.role === "user") break;
				if (this.ctx.streamingComponent && event.message.role === "assistant") {
					this.ctx.streamingMessage = event.message;
					let errorMessage: string | undefined;
					if (this.ctx.streamingMessage.stopReason === "aborted" && !this.ctx.session.isTtsrAbortPending) {
						const retryAttempt = this.ctx.session.retryAttempt;
						errorMessage =
							retryAttempt > 0
								? `Aborted after ${retryAttempt} retry attempt${retryAttempt > 1 ? "s" : ""}`
								: "Operation aborted";
						this.ctx.streamingMessage.errorMessage = errorMessage;
					}
					if (this.ctx.session.isTtsrAbortPending && this.ctx.streamingMessage.stopReason === "aborted") {
						const msgWithoutAbort = { ...this.ctx.streamingMessage, stopReason: "stop" as const };
						this.ctx.streamingComponent.updateContent(msgWithoutAbort);
					} else {
						this.ctx.streamingComponent.updateContent(this.ctx.streamingMessage);
					}

					if (
						this.ctx.streamingMessage.stopReason !== "aborted" &&
						this.ctx.streamingMessage.stopReason !== "error"
					) {
						for (const [toolCallId, component] of this.ctx.pendingTools.entries()) {
							component.setArgsComplete(toolCallId);
						}
					}
					this.#lastAssistantComponent = this.ctx.streamingComponent;
					this.#lastAssistantComponent.setUsageInfo(event.message.usage);
					this.ctx.streamingComponent = undefined;
					this.ctx.streamingMessage = undefined;
					this.ctx.statusLine.invalidate();
					this.ctx.updateEditorTopBorder();
				}
				this.ctx.ui.requestRender();
				break;

			case "tool_execution_start": {
				this.#updateWorkingMessageFromIntent(event.intent);
				if (!this.ctx.pendingTools.has(event.toolCallId)) {
					if (event.toolName === "read") {
						this.#trackReadToolCall(event.toolCallId, event.args);
						const component = this.ctx.pendingTools.get(event.toolCallId);
						if (component) {
							component.updateArgs(event.args, event.toolCallId);
						} else {
							const group = this.#getReadGroup();
							group.updateArgs(event.args, event.toolCallId);
							this.ctx.pendingTools.set(event.toolCallId, group);
						}
						this.ctx.ui.requestRender();
						break;
					}

					this.#resetReadGroup();
					const tool = this.ctx.session.getToolByName(event.toolName);
					const component = new ToolExecutionComponent(
						event.toolName,
						event.args,
						{
							showImages: settings.get("terminal.showImages"),
							editFuzzyThreshold: settings.get("edit.fuzzyThreshold"),
							editAllowFuzzy: settings.get("edit.fuzzyMatch"),
						},
						tool,
						this.ctx.ui,
						this.ctx.sessionManager.getCwd(),
					);
					component.setExpanded(this.ctx.toolOutputExpanded);
					this.ctx.chatContainer.addChild(component);
					this.ctx.pendingTools.set(event.toolCallId, component);
					this.ctx.ui.requestRender();
				}
				break;
			}

			case "tool_execution_update": {
				const component = this.ctx.pendingTools.get(event.toolCallId);
				if (component) {
					const asyncState = (event.partialResult.details as { async?: { state?: string } } | undefined)?.async
						?.state;
					const isFinalAsyncState = asyncState === "completed" || asyncState === "failed";
					component.updateResult(
						{ ...event.partialResult, isError: asyncState === "failed" },
						!isFinalAsyncState,
						event.toolCallId,
					);
					if (isFinalAsyncState) {
						this.ctx.pendingTools.delete(event.toolCallId);
						this.#backgroundToolCallIds.delete(event.toolCallId);
					}
					this.ctx.ui.requestRender();
				}
				break;
			}

			case "tool_execution_end": {
				if (event.toolName === "read") {
					if (this.#inlineReadToolImages(event.toolCallId, event.result)) {
						const component = this.ctx.pendingTools.get(event.toolCallId);
						if (component) {
							component.updateResult({ ...event.result, isError: event.isError }, false, event.toolCallId);
							this.ctx.pendingTools.delete(event.toolCallId);
						}
						const asyncState = (event.result.details as { async?: { state?: string } } | undefined)?.async?.state;
						if (asyncState === "running") {
							this.#backgroundToolCallIds.add(event.toolCallId);
						} else {
							this.#backgroundToolCallIds.delete(event.toolCallId);
							this.#clearReadToolCall(event.toolCallId);
						}
						this.ctx.ui.requestRender();
					} else {
						let component = this.ctx.pendingTools.get(event.toolCallId);
						if (!component) {
							const group = this.#getReadGroup();
							const args = this.#readToolCallArgs.get(event.toolCallId);
							if (args) {
								group.updateArgs(args, event.toolCallId);
							}
							component = group;
							this.ctx.pendingTools.set(event.toolCallId, group);
						}
						const asyncState = (event.result.details as { async?: { state?: string } } | undefined)?.async?.state;
						const isBackgroundRunning = asyncState === "running";
						component.updateResult(
							{ ...event.result, isError: event.isError },
							isBackgroundRunning,
							event.toolCallId,
						);
						if (isBackgroundRunning) {
							this.#backgroundToolCallIds.add(event.toolCallId);
						} else {
							this.ctx.pendingTools.delete(event.toolCallId);
							this.#backgroundToolCallIds.delete(event.toolCallId);
							this.#clearReadToolCall(event.toolCallId);
						}
						this.ctx.ui.requestRender();
					}
				} else {
					const component = this.ctx.pendingTools.get(event.toolCallId);
					if (component) {
						const asyncState = (event.result.details as { async?: { state?: string } } | undefined)?.async?.state;
						const isBackgroundRunning = asyncState === "running";
						component.updateResult(
							{ ...event.result, isError: event.isError },
							isBackgroundRunning,
							event.toolCallId,
						);
						if (isBackgroundRunning) {
							this.#backgroundToolCallIds.add(event.toolCallId);
						} else {
							this.ctx.pendingTools.delete(event.toolCallId);
							this.#backgroundToolCallIds.delete(event.toolCallId);
						}
						this.ctx.ui.requestRender();
					}
				}
				// Update todo display when todo_write tool completes
				if (event.toolName === "todo_write" && !event.isError) {
					const details = event.result.details as { phases?: TodoPhase[] } | undefined;
					if (details?.phases) {
						this.ctx.setTodos(details.phases);
					}
				} else if (event.toolName === "todo_write" && event.isError) {
					const textContent = event.result.content.find(
						(content: { type: string; text?: string }) => content.type === "text",
					)?.text;
					this.ctx.showWarning(
						`Todo update failed${textContent ? `: ${textContent}` : ". Progress may be stale until todo_write succeeds."}`,
					);
				}
				if (event.toolName === "exit_plan_mode" && !event.isError) {
					const details = event.result.details as ExitPlanModeDetails | undefined;
					if (details) {
						await this.ctx.handleExitPlanModeTool(details);
					}
				}
				break;
			}

			case "agent_end":
				if (this.ctx.loadingAnimation) {
					this.ctx.loadingAnimation.stop();
					this.ctx.loadingAnimation = undefined;
					this.ctx.statusContainer.clear();
				}
				if (this.ctx.streamingComponent) {
					this.ctx.chatContainer.removeChild(this.ctx.streamingComponent);
					this.ctx.streamingComponent = undefined;
					this.ctx.streamingMessage = undefined;
				}
				await this.ctx.flushPendingModelSwitch();
				for (const toolCallId of Array.from(this.ctx.pendingTools.keys())) {
					if (!this.#backgroundToolCallIds.has(toolCallId)) {
						this.ctx.pendingTools.delete(toolCallId);
					}
				}
				this.#backgroundToolCallIds = new Set(
					Array.from(this.#backgroundToolCallIds).filter(toolCallId => this.ctx.pendingTools.has(toolCallId)),
				);
				this.#readToolCallArgs.clear();
				this.#readToolCallAssistantComponents.clear();
				this.#lastAssistantComponent = undefined;
				this.ctx.ui.requestRender();
				this.sendCompletionNotification();
				break;

			case "auto_compaction_start": {
				this.ctx.autoCompactionEscapeHandler = this.ctx.editor.onEscape;
				this.ctx.editor.onEscape = () => {
					this.ctx.session.abortCompaction();
				};
				this.ctx.statusContainer.clear();
				const reasonText = event.reason === "overflow" ? "Context overflow detected, " : "";
				const actionLabel = event.action === "handoff" ? "Auto-handoff" : "Auto context-full maintenance";
				this.ctx.autoCompactionLoader = new Loader(
					this.ctx.ui,
					spinner => theme.fg("accent", spinner),
					text => theme.fg("muted", text),
					`${reasonText}${actionLabel}… (esc to cancel)`,
					getSymbolTheme().spinnerFrames,
				);
				this.ctx.statusContainer.addChild(this.ctx.autoCompactionLoader);
				this.ctx.ui.requestRender();
				break;
			}

			case "auto_compaction_end": {
				if (this.ctx.autoCompactionEscapeHandler) {
					this.ctx.editor.onEscape = this.ctx.autoCompactionEscapeHandler;
					this.ctx.autoCompactionEscapeHandler = undefined;
				}
				if (this.ctx.autoCompactionLoader) {
					this.ctx.autoCompactionLoader.stop();
					this.ctx.autoCompactionLoader = undefined;
					this.ctx.statusContainer.clear();
				}
				const isHandoffAction = event.action === "handoff";
				if (event.aborted) {
					this.ctx.showStatus(
						isHandoffAction ? "Auto-handoff cancelled" : "Auto context-full maintenance cancelled",
					);
				} else if (event.result) {
					this.ctx.rebuildChatFromMessages();
					this.ctx.statusLine.invalidate();
					this.ctx.updateEditorTopBorder();
				} else if (event.errorMessage) {
					this.ctx.showWarning(event.errorMessage);
				} else if (isHandoffAction) {
					this.ctx.chatContainer.clear();
					this.ctx.rebuildChatFromMessages();
					this.ctx.statusLine.invalidate();
					this.ctx.updateEditorTopBorder();
					await this.ctx.reloadTodos();
					this.ctx.showStatus("Auto-handoff completed");
				} else if (event.skipped) {
					// Benign skip: no model selected, no candidate models available, or nothing
					// to compact yet. Not a failure — suppress the warning.
				} else {
					this.ctx.showWarning("Auto context-full maintenance failed; continuing without maintenance");
				}
				await this.ctx.flushCompactionQueue({ willRetry: event.willRetry });
				this.ctx.ui.requestRender();
				break;
			}

			case "auto_retry_start": {
				this.ctx.retryEscapeHandler = this.ctx.editor.onEscape;
				this.ctx.editor.onEscape = () => {
					this.ctx.session.abortRetry();
				};
				this.ctx.statusContainer.clear();
				const delaySeconds = Math.round(event.delayMs / 1000);
				this.ctx.retryLoader = new Loader(
					this.ctx.ui,
					spinner => theme.fg("warning", spinner),
					text => theme.fg("muted", text),
					`Retrying (${event.attempt}/${event.maxAttempts}) in ${delaySeconds}s… (esc to cancel)`,
					getSymbolTheme().spinnerFrames,
				);
				this.ctx.statusContainer.addChild(this.ctx.retryLoader);
				this.ctx.ui.requestRender();
				break;
			}

			case "auto_retry_end": {
				if (this.ctx.retryEscapeHandler) {
					this.ctx.editor.onEscape = this.ctx.retryEscapeHandler;
					this.ctx.retryEscapeHandler = undefined;
				}
				if (this.ctx.retryLoader) {
					this.ctx.retryLoader.stop();
					this.ctx.retryLoader = undefined;
					this.ctx.statusContainer.clear();
				}
				if (!event.success) {
					this.ctx.showError(
						`Retry failed after ${event.attempt} attempts: ${event.finalError || "Unknown error"}`,
					);
				}
				this.ctx.ui.requestRender();
				break;
			}

			case "retry_fallback_applied": {
				this.ctx.showWarning(`Fallback: ${event.from} -> ${event.to}`);
				break;
			}

			case "retry_fallback_succeeded": {
				this.ctx.showStatus(`Fallback succeeded on ${event.model}`);
				break;
			}

			case "ttsr_triggered": {
				const component = new TtsrNotificationComponent(event.rules);
				component.setExpanded(this.ctx.toolOutputExpanded);
				this.ctx.chatContainer.addChild(component);
				this.ctx.ui.requestRender();
				break;
			}

			case "todo_reminder": {
				const component = new TodoReminderComponent(event.todos, event.attempt, event.maxAttempts);
				this.ctx.chatContainer.addChild(component);
				this.ctx.ui.requestRender();
				break;
			}

			case "todo_auto_clear":
				await this.ctx.reloadTodos();
				break;
		}
	}

	sendCompletionNotification(): void {
		if (this.ctx.isBackgrounded === false) return;
		const notify = settings.get("completion.notify");
		if (notify === "off") return;
		const title = this.ctx.sessionManager.getSessionName();
		const message = title ? `${title}: Complete` : "Complete";
		TERMINAL.sendNotification(message);
	}

	async handleBackgroundEvent(event: AgentSessionEvent): Promise<void> {
		if (event.type !== "agent_end") {
			return;
		}
		if (this.ctx.session.queuedMessageCount > 0 || this.ctx.session.isStreaming) {
			return;
		}
		this.sendCompletionNotification();
		await this.ctx.shutdown();
	}
}