import { and, asc, eq } from "drizzle-orm";
import { messages, topics } from "~~/db/schema";
import { protectRoute } from "~~/server/utils/auth";
import type { Message, Topic } from '~~/types'

export default defineEventHandler(async (event) => {
    await protectRoute(event);

    const db = useDrizzle();
    const userId = event.context.user.id;
    const topicId = getRouterParam(event, 'id');

    if (!topicId) {
        throw createError({
            statusCode: 400,
            statusMessage: 'Topic ID is required'
        });
    }

    const rows = await db
        .select()
        .from(topics)
        .where(and(eq(topics.userId, userId), eq(topics.id, topicId)));

    if (rows.length === 0) {
        throw createError({
            statusCode: 404,
            statusMessage: 'Topic not found'
        });
    }

    const topic = rows[0] as Topic & { messages: Message[] };
    
    // Fetch messages for this topic, ordered chronologically
    topic.messages = await db
        .select()
        .from(messages)
        .where(eq(messages.topicId, topic.id))
        .orderBy(asc(messages.createdAt));

    return topic;
});