files.ts

import { listRepoFiles, readRepoFile } from "@procni/core";
import { ProcniError } from "@procni/shared";
import type { FastifyInstance } from "fastify";
import type { ServerDeps } from "../types.js";

/**
 * Backs the file-search compose flow: a developer searches for a file by
 * name, then reads its content client-side to highlight and select lines
 * from — no diff or existing opportunity involved. Both routes trust
 * `listRepoFiles`/`readRepoFile`'s `git ls-files` allowlist as the only
 * path-safety check; see `packages/core/src/git/files.ts`.
 */
export async function filesRoute(app: FastifyInstance, deps: ServerDeps): Promise<void> {
  app.get("/api/v1/files", async (request) => {
    const query = (request.query as { q?: string }).q ?? "";
    const files = await listRepoFiles(deps.repoRoot);
    const matches = query ? files.filter((path) => path.toLowerCase().includes(query.toLowerCase())) : files;
    return { files: matches.slice(0, 50) };
  });

  app.get("/api/v1/files/content", async (request, reply) => {
    const path = (request.query as { path?: string }).path;
    if (!path) {
      return reply.code(400).send({ error: { code: "SCHEMA_VALIDATION_FAILED", message: "path is required." } });
    }
    try {
      const content = await readRepoFile(deps.repoRoot, path);
      return { content };
    } catch (error) {
      if (error instanceof ProcniError && error.code === "NOT_FOUND") {
        return reply.code(404).send({ error: { code: "NOT_FOUND", message: error.message } });
      }
      throw error;
    }
  });
}