import assert from 'node:assert/strict';
import { spawnSync } from 'node:child_process';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import test from 'node:test';
import { fileURLToPath } from 'node:url';

const runner = fileURLToPath(
  new URL('./run-rust-shell-test-shards.mjs', import.meta.url),
);

function runFixture(t, source) {
  const root = fs.mkdtempSync(path.join(os.tmpdir(), 'agc-shard-output-'));
  t.after(() => fs.rmSync(root, { recursive: true, force: true }));
  fs.mkdirSync(path.join(root, 'src'));
  fs.writeFileSync(
    path.join(root, 'Cargo.toml'),
    '[package]\nname = "shard-output-fixture"\nversion = "0.1.0"\nedition = "2021"\n',
  );
  fs.writeFileSync(path.join(root, 'src/lib.rs'), source);
  const result = spawnSync(
    process.execPath,
    [
      runner,
      `--manifest=${path.join(root, 'Cargo.toml')}`,
      '--target-kind=lib',
      '--no-locked',
      '--shards=1',
      `--shard-tmp-root=${path.join(root, 'tmp')}`,
    ],
    {
      encoding: 'utf8',
      timeout: 60_000,
      windowsHide: true,
      env: { ...process.env, CARGO_TARGET_DIR: path.join(root, 'target') },
    },
  );
  assert.ifError(result.error);
  return { status: result.status, output: result.stdout + result.stderr };
}

test('failed shard retains panic details and separates selected count from failures', (t) => {
  const result = runFixture(
    t,
    `
#[test]
fn passing_case() {}
#[test]
fn failing_case() {
    assert_eq!(1, 2, "shard panic evidence");
}
`,
  );
  assert.equal(result.status, 1, result.output);
  assert.match(result.output, /FAILED \(selected 2 test\(s\)\)/);
  assert.match(result.output, /failing_case/);
  assert.match(result.output, /panicked at src[\\/]lib\.rs:/);
  assert.match(result.output, /shard panic evidence/);
  assert.match(result.output, /left: 1/);
  assert.match(result.output, /right: 2/);
  assert.match(result.output, /1 passed; 1 failed/);
});

test('successful shard keeps its compact summary', (t) => {
  const result = runFixture(t, '#[test]\nfn passing_case() {}\n');
  assert.equal(result.status, 0, result.output);
  assert.match(result.output, /shard 1\/1 ok: 1 test\(s\)/);
  assert.doesNotMatch(result.output, /test passing_case \.\.\. ok/);
});