# All files / src/trpc/routers conversation.ts

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    11x

     /**
     * Conversation Router — inter-agent communication procedures
     */

    import { TRPCError } from '@trpc/server';
    import { tracked, type TrackedEnvelope } from '@trpc/server';
    import { z } from 'zod';
    import type { ProcedureBuilder } from '../trpc.js';
    import { requireConversationRepository, requireAgentManager, requireTaskRepository } from './_helpers.js';
    import type { ConversationCreatedEvent, ConversationAnsweredEvent } from '../../events/types.js';

    export function conversationProcedures(publicProcedure: ProcedureBuilder) {
      return {
        createConversation: publicProcedure
          .input(z.object({
            fromAgentId: z.string().min(1),
            toAgentId: z.string().min(1).optional(),
            phaseId: z.string().min(1).optional(),
            taskId: z.string().min(1).optional(),
            question: z.string().min(1),
          }))
          .mutation(async ({ ctx, input }) => {
            const repo = requireConversationRepository(ctx);
            const agentManager = requireAgentManager(ctx);

            let toAgentId = input.toAgentId;

            // Resolve target agent from taskId
            if (!toAgentId && input.taskId) {
              const agents = await agentManager.list();
              const match = agents.find(a => a.taskId === input.taskId && a.status === 'running');
              if (!match) {
                throw new TRPCError({
                  code: 'NOT_FOUND',
                  message: `No running agent found for task '${input.taskId}'`,
                });
              }
              toAgentId = match.id;
            }

            // Resolve target agent from phaseId
            if (!toAgentId && input.phaseId) {
              const taskRepo = requireTaskRepository(ctx);
              const tasks = await taskRepo.findByPhaseId(input.phaseId);
              const taskIds = new Set(tasks.map(t => t.id));
              const agents = await agentManager.list();
              const match = agents.find(a => a.taskId && taskIds.has(a.taskId) && a.status === 'running');
              if (!match) {
                throw new TRPCError({
                  code: 'NOT_FOUND',
                  message: `No running agent found for phase '${input.phaseId}'`,
                });
              }
              toAgentId = match.id;
            }

            if (!toAgentId) {
              throw new TRPCError({
                code: 'BAD_REQUEST',
                message: 'Must provide toAgentId, taskId, or phaseId to identify target agent',
              });
            }

            const conversation = await repo.create({
              fromAgentId: input.fromAgentId,
              toAgentId,
              initiativeId: null,
              phaseId: input.phaseId ?? null,
              taskId: input.taskId ?? null,
              question: input.question,
            });

            ctx.eventBus.emit({
              type: 'conversation:created' as const,
              timestamp: new Date(),
              payload: {
                conversationId: conversation.id,
                fromAgentId: input.fromAgentId,
                toAgentId,
              },
            });

            return conversation;
          }),

        getPendingConversations: publicProcedure
          .input(z.object({
            agentId: z.string().min(1),
          }))
          .query(async ({ ctx, input }) => {
            const repo = requireConversationRepository(ctx);
            return repo.findPendingForAgent(input.agentId);
          }),

        getConversation: publicProcedure
          .input(z.object({
            id: z.string().min(1),
          }))
          .query(async ({ ctx, input }) => {
            const repo = requireConversationRepository(ctx);
            return repo.findById(input.id);
          }),

        answerConversation: publicProcedure
          .input(z.object({
            id: z.string().min(1),
            answer: z.string().min(1),
          }))
          .mutation(async ({ ctx, input }) => {
            const repo = requireConversationRepository(ctx);
            const existing = await repo.findById(input.id);
            if (!existing) {
              throw new TRPCError({
                code: 'NOT_FOUND',
                message: `Conversation '${input.id}' not found`,
              });
            }
            if (existing.status === 'answered') {
              throw new TRPCError({
                code: 'BAD_REQUEST',
                message: `Conversation '${input.id}' is already answered`,
              });
            }

            const updated = await repo.answer(input.id, input.answer);

            ctx.eventBus.emit({
              type: 'conversation:answered' as const,
              timestamp: new Date(),
              payload: {
                conversationId: input.id,
                fromAgentId: existing.fromAgentId,
                toAgentId: existing.toAgentId,
              },
            });

            return updated;
          }),

        onPendingConversation: publicProcedure
          .input(z.object({ agentId: z.string().min(1) }))
          .subscription(async function* (opts): AsyncGenerator<TrackedEnvelope<{
            conversationId: string;
            fromAgentId: string;
            question: string;
            phaseId: string | null;
            taskId: string | null;
          }>> {
            const { agentId } = opts.input;
            const signal = opts.signal ?? new AbortController().signal;
            const eventBus = opts.ctx.eventBus;
            const repo = requireConversationRepository(opts.ctx);

            // First yield any already-pending conversations
            const existing = await repo.findPendingForAgent(agentId);
            let eventCounter = 0;
            for (const conv of existing) {
              yield tracked(`conv-${eventCounter++}`, {
                conversationId: conv.id,
                fromAgentId: conv.fromAgentId,
                question: conv.question,
                phaseId: conv.phaseId,
                taskId: conv.taskId,
              });
            }

            // Then listen for new conversation:created events
            const queue: string[] = []; // conversation IDs
            let resolve: (() => void) | null = null;

            const handler = (event: ConversationCreatedEvent) => {
              if (event.payload.toAgentId !== agentId) return;
              queue.push(event.payload.conversationId);
              if (resolve) {
                const r = resolve;
                resolve = null;
                r();
              }
            };

            eventBus.on('conversation:created', handler);

            const cleanup = () => {
              eventBus.off('conversation:created', handler);
              if (resolve) {
                const r = resolve;
                resolve = null;
                r();
              }
            };

            signal.addEventListener('abort', cleanup, { once: true });

            try {
              while (!signal.aborted) {
                while (queue.length > 0) {
                  const convId = queue.shift()!;
                  const conv = await repo.findById(convId);
                  if (conv && conv.status === 'pending') {
                    yield tracked(`conv-${eventCounter++}`, {
                      conversationId: conv.id,
                      fromAgentId: conv.fromAgentId,
                      question: conv.question,
                      phaseId: conv.phaseId,
                      taskId: conv.taskId,
                    });
                  }
                }

                if (!signal.aborted) {
                  await new Promise<void>((r) => {
                    resolve = r;
                  });
                }
              }
            } finally {
              cleanup();
            }
          }),

        onConversationAnswer: publicProcedure
          .input(z.object({ conversationId: z.string().min(1) }))
          .subscription(async function* (opts): AsyncGenerator<TrackedEnvelope<{ answer: string }>> {
            const { conversationId } = opts.input;
            const signal = opts.signal ?? new AbortController().signal;
            const eventBus = opts.ctx.eventBus;
            const repo = requireConversationRepository(opts.ctx);

            // Check if already answered
            const existing = await repo.findById(conversationId);
            if (existing && existing.status === 'answered' && existing.answer) {
              yield tracked('answer-0', { answer: existing.answer });
              return;
            }

            // Listen for conversation:answered events matching this ID
            let answered = false;
            let resolve: (() => void) | null = null;

            const handler = (event: ConversationAnsweredEvent) => {
              if (event.payload.conversationId !== conversationId) return;
              answered = true;
              if (resolve) {
                const r = resolve;
                resolve = null;
                r();
              }
            };

            eventBus.on('conversation:answered', handler);

            const cleanup = () => {
              eventBus.off('conversation:answered', handler);
              if (resolve) {
                const r = resolve;
                resolve = null;
                r();
              }
            };

            signal.addEventListener('abort', cleanup, { once: true });

            try {
              while (!signal.aborted && !answered) {
                await new Promise<void>((r) => {
                  resolve = r;
                });
              }

              if (answered) {
                const conv = await repo.findById(conversationId);
                if (conv && conv.answer) {
                  yield tracked('answer-0', { answer: conv.answer });
                }
              }
            } finally {
              cleanup();
            }
          }),
      };
    }