import type { FastifyInstance } from 'fastify';
import type { Sql } from '../db.js';
import type { ToolTrace } from '../services/tool-traces.js';

export function registerTraceRoutes(app: FastifyInstance, sql: Sql): void {
  app.get<{ Params: { id: string }; Querystring: { limit?: string; offset?: string } }>(
    '/api/chats/:id/traces',
    async (req, reply) => {
      const chat = await sql`SELECT id FROM chats WHERE id = ${req.params.id}`;
      if (chat.length === 0) {
        reply.code(404);
        return { error: 'chat not found' };
      }

      const limit = Math.min(Math.max(Number(req.query.limit) || 50, 1), 200);
      const offset = Math.max(Number(req.query.offset) || 0, 0);

      const rows = await sql<ToolTrace[]>`
        SELECT * FROM tool_traces
        WHERE chat_id = ${req.params.id}
        ORDER BY started_at ASC
        LIMIT ${limit}
        OFFSET ${offset}
      `;

      const [countRow] = await sql<{ count: number }[]>`
        SELECT count(*)::int AS count FROM tool_traces WHERE chat_id = ${req.params.id}
      `;

      return {
        data: rows,
        total: countRow?.count ?? 0,
        limit,
        offset,
      };
    },
  );
}