import fs from "node:fs";
import os from "node:os";
import path from "node:path";

// A fresh scratch directory for one test, removed after it. Returns
// { dir, dataRoot, outside }: the data root and a sibling outside it.
export function scratch(t) {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), "mosaic-runs-test-"));
  t.after(() => fs.rmSync(dir, { recursive: true, force: true }));
  const dataRoot = path.join(dir, "data");
  const outside = path.join(dir, "outside");
  fs.mkdirSync(dataRoot);
  fs.mkdirSync(outside);
  return { dir, dataRoot, outside };
}

export function write(file, content) {
  fs.mkdirSync(path.dirname(file), { recursive: true });
  fs.writeFileSync(file, typeof content === "string" ? content : `${JSON.stringify(content)}\n`);
}

// A listing of every path under dir with its type, size, mtime and link
// target, to show that a reader changed nothing.
export function tree(dir) {
  const lines = [];
  const walk = (current) => {
    for (const name of fs.readdirSync(current).sort()) {
      const file = path.join(current, name);
      const stat = fs.lstatSync(file);
      const link = stat.isSymbolicLink() ? fs.readlinkSync(file) : "";
      lines.push(`${path.relative(dir, file)} ${stat.mode} ${stat.size} ${stat.mtimeMs} ${link}`);
      if (stat.isDirectory()) walk(file);
    }
  };
  walk(dir);
  return lines.join("\n");
}

export const RESULT = {
  runVersion: 1,
  runId: "r-20260101T000000Z-aaaaaa",
  taskId: "t-one",
  missionId: null,
  status: "succeeded",
  reason: null,
  request: "hi",
  response: "hi",
  expectedExact: null,
  workspace: null,
  tools: null,
  session: null,
  sessionForkFrom: null,
  exitCode: 0,
  signal: null,
  provider: "zai",
  model: "m",
  startedAt: "2026-01-01T00:00:00.000Z",
  finishedAt: "2026-01-01T00:00:01.000Z",
  durationMs: 1000,
};