/**
 * Shared work/ solution picker for the test and submit entries: fuzzy-select
 * a solution file, then hand it to leetcode-cli. Library: side-effect-free on
 * import — nothing scans the filesystem until runOnSolution() is called.
 */
import { autocomplete, cancel, isCancel, log } from "@clack/prompts";
import { join, relative } from "node:path";

const ROOT = join(import.meta.dir, "..", "..");
const WORK_DIR = join(ROOT, "work");

/** Fuzzy-pick a solution under work/ and run `leetcode <command>` on it. */
export async function runOnSolution(command: "test" | "submit", message: string): Promise<never> {
  const files = [...new Bun.Glob("**/*.{js,ts,py,java,c,cpp,go,rs,rb,swift,kt,cs}").scanSync({ cwd: WORK_DIR })]
    .sort((a, b) => a.localeCompare(b, undefined, { numeric: true }));

  if (files.length === 0) {
    log.error(`No solution files found in ${relative(process.cwd(), WORK_DIR)}/`);
    process.exit(1);
  }

  const picked = await autocomplete<string>({
    message,
    placeholder: "Type to search...",
    maxItems: 12,
    options: files.map((f) => {
      // work layout: Difficulty/Category/<id>.<slug>.<ext>
      const [difficulty, category, name] = f.split("/");
      return {
        value: f,
        label: name ?? f,
        hint: category ? `${difficulty} · ${category}` : difficulty,
      };
    }),
    filter: (search, option) => {
      const haystack = option.value.toLowerCase();
      return search
        .toLowerCase()
        .split(/\s+/)
        .every((token) => haystack.includes(token));
    },
  });

  if (isCancel(picked)) {
    cancel("Nothing selected.");
    process.exit(0);
  }

  const proc = Bun.spawn(
    [
      // bun installs workspace-dep bins into this package's node_modules, not the root's
      join(import.meta.dir, "node_modules", ".bin", "leetcode"),
      command,
      join(WORK_DIR, picked),
    ],
    { cwd: ROOT, stdio: ["inherit", "inherit", "inherit"] },
  );
  process.exit(await proc.exited);
}