/**
 * Message Router — list, get, respond
 */

import { TRPCError } from '@trpc/server';
import { z } from 'zod';
import type { ProcedureBuilder } from '../trpc.js';
import { requireMessageRepository } from './_helpers.js';

export function messageProcedures(publicProcedure: ProcedureBuilder) {
  return {
    listMessages: publicProcedure
      .input(z.object({
        agentId: z.string().optional(),
        status: z.enum(['pending', 'read', 'responded']).optional(),
      }))
      .query(async ({ ctx, input }) => {
        const messageRepository = requireMessageRepository(ctx);

        let messages = await messageRepository.findByRecipient('user');

        if (input.agentId) {
          messages = messages.filter(m => m.senderId === input.agentId);
        }

        if (input.status) {
          messages = messages.filter(m => m.status === input.status);
        }

        return messages;
      }),

    getMessage: publicProcedure
      .input(z.object({ id: z.string().min(1) }))
      .query(async ({ ctx, input }) => {
        const messageRepository = requireMessageRepository(ctx);
        const message = await messageRepository.findById(input.id);
        if (!message) {
          throw new TRPCError({
            code: 'NOT_FOUND',
            message: `Message '${input.id}' not found`,
          });
        }
        return message;
      }),

    respondToMessage: publicProcedure
      .input(z.object({
        id: z.string().min(1),
        response: z.string().min(1),
      }))
      .mutation(async ({ ctx, input }) => {
        const messageRepository = requireMessageRepository(ctx);

        const existing = await messageRepository.findById(input.id);
        if (!existing) {
          throw new TRPCError({
            code: 'NOT_FOUND',
            message: `Message '${input.id}' not found`,
          });
        }

        const responseMessage = await messageRepository.create({
          senderType: 'user',
          recipientType: 'agent',
          recipientId: existing.senderId,
          type: 'response',
          content: input.response,
          parentMessageId: input.id,
        });

        await messageRepository.update(input.id, { status: 'responded' });

        return responseMessage;
      }),
  };
}