// tests/kb-update/test-install-cron.test.mjs
// Subprocess + filesystem-snapshot tests for scripts/install-kb-cron.mjs
// (Step 11). Exercises --print-only across targets and verifies idempotent
// --uninstall. Never invokes launchctl/systemctl/Register-ScheduledTask
// against real schedulers; --print-only short-circuits before any
// side-effecting call, and --uninstall is exercised against an empty HOME
// where the install file simply does not exist.

import { test } from 'node:test';
import assert from 'node:assert/strict';
import { spawnSync } from 'node:child_process';
import { mkdtempSync, rmSync, readdirSync, existsSync } from 'node:fs';
import { tmpdir, platform as osPlatform } from 'node:os';
import { join, dirname } from 'node:path';
import { fileURLToPath } from 'node:url';

const __dirname = dirname(fileURLToPath(import.meta.url));
const SCRIPT = join(__dirname, '..', '..', 'scripts', 'install-kb-cron.mjs');

function mkSandbox() {
  return mkdtempSync(join(tmpdir(), 'install-kb-cron-test-'));
}

function runInstall(args, env = {}) {
  return spawnSync('node', [SCRIPT, ...args], {
    env: { PATH: process.env.PATH, ...env },
    encoding: 'utf8',
    timeout: 30_000,
  });
}

function snapshotDir(dir) {
  const out = [];
  function walk(d) {
    if (!existsSync(d)) return;
    let entries;
    try {
      entries = readdirSync(d, { withFileTypes: true });
    } catch {
      return;
    }
    for (const entry of entries) {
      const p = join(d, entry.name);
      out.push(p);
      if (entry.isDirectory()) walk(p);
    }
  }
  walk(dir);
  return out.sort();
}

function hostTarget() {
  const p = osPlatform();
  if (p === 'darwin') return 'macos';
  if (p === 'linux') return 'linux';
  if (p === 'win32') return 'windows';
  return null;
}

test('--print-only --target macos: substituted plist with no unsubstituted placeholders', () => {
  const home = mkSandbox();
  try {
    const r = runInstall(['--print-only', '--target', 'macos'], { HOME: home });
    assert.equal(r.status, 0, `stderr: ${r.stderr}\nstdout: ${r.stdout}`);
    assert.match(r.stdout, /<key>Label<\/key>/);
    assert.match(r.stdout, /<key>StartCalendarInterval<\/key>/);
    assert.match(r.stdout, /<integer>3<\/integer>/, 'default day-of-week=3 (Wednesday)');
    assert.match(r.stdout, /<integer>4<\/integer>/, 'default hour=4');
    assert.match(r.stdout, /<integer>23<\/integer>/, 'default minute=23');
    assert.doesNotMatch(r.stdout, /\{\{[A-Z_]+\}\}/, 'no unsubstituted {{...}} placeholders');
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('--print-only --target linux: filled service+timer with [Unit] and OnCalendar=Wed', () => {
  const home = mkSandbox();
  try {
    const r = runInstall(['--print-only', '--target', 'linux'], { HOME: home });
    assert.equal(r.status, 0, `stderr: ${r.stderr}`);
    assert.match(r.stdout, /\[Unit\]/);
    assert.match(r.stdout, /\[Service\]/);
    assert.match(r.stdout, /\[Timer\]/);
    assert.match(r.stdout, /OnCalendar=Wed/);
    assert.match(r.stdout, /ExecStart=/);
    assert.doesNotMatch(r.stdout, /\{\{[A-Z_]+\}\}/, 'no unsubstituted {{...}} placeholders');
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('--print-only --target windows: Register-ScheduledTask + InteractiveToken', () => {
  const home = mkSandbox();
  try {
    const r = runInstall(['--print-only', '--target', 'windows'], { HOME: home });
    assert.equal(r.status, 0, `stderr: ${r.stderr}`);
    assert.match(r.stdout, /Register-ScheduledTask/);
    assert.match(r.stdout, /InteractiveToken/);
    assert.match(r.stdout, /-DaysOfWeek\s+Wednesday/);
    assert.doesNotMatch(r.stdout, /\{\{[A-Z_]+\}\}/, 'no unsubstituted {{...}} placeholders');
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('--print-only writes no files (HOME snapshot before/after equal)', () => {
  const home = mkSandbox();
  try {
    const before = snapshotDir(home);
    const r = runInstall(['--print-only', '--target', 'macos'], { HOME: home });
    assert.equal(r.status, 0, `stderr: ${r.stderr}`);
    const after = snapshotDir(home);
    assert.deepEqual(after, before, 'HOME must not be touched in --print-only mode');
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('--print-only --target linux writes no files in HOME', () => {
  const home = mkSandbox();
  try {
    const before = snapshotDir(home);
    const r = runInstall(['--print-only', '--target', 'linux'], { HOME: home });
    assert.equal(r.status, 0, `stderr: ${r.stderr}`);
    const after = snapshotDir(home);
    assert.deepEqual(after, before, 'HOME must not be touched in --print-only mode (linux target)');
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('--uninstall is idempotent (exit 0 with nothing installed)', () => {
  const home = mkSandbox();
  try {
    const target = hostTarget() || 'macos';
    const r = runInstall(['--uninstall', '--target', target], { HOME: home });
    assert.equal(r.status, 0, `stderr: ${r.stderr}\nstdout: ${r.stdout}`);
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('--uninstall --target macos on empty HOME: idempotent (no plist, no launchctl call)', () => {
  const home = mkSandbox();
  try {
    const r = runInstall(['--uninstall', '--target', 'macos'], { HOME: home });
    assert.equal(r.status, 0, `stderr: ${r.stderr}`);
    assert.match((r.stdout || '') + (r.stderr || ''), /nothing to remove|not installed/i);
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('--schedule with custom cron expr substitutes correctly into plist', () => {
  const home = mkSandbox();
  try {
    const r = runInstall(
      ['--print-only', '--target', 'macos', '--schedule', '15 7 * * 5'],
      { HOME: home },
    );
    assert.equal(r.status, 0, `stderr: ${r.stderr}`);
    assert.match(r.stdout, /<integer>15<\/integer>/, 'minute=15');
    assert.match(r.stdout, /<integer>7<\/integer>/, 'hour=7');
    assert.match(r.stdout, /<integer>5<\/integer>/, 'day-of-week=5 (Friday)');
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('invalid --target rejects with non-zero exit', () => {
  const home = mkSandbox();
  try {
    const r = runInstall(['--print-only', '--target', 'bogus'], { HOME: home });
    assert.notEqual(r.status, 0);
    assert.match((r.stderr || '') + (r.stdout || ''), /target|invalid|unsupported/i);
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('invalid --schedule rejects with non-zero exit', () => {
  const home = mkSandbox();
  try {
    const r = runInstall(
      ['--print-only', '--target', 'macos', '--schedule', 'not a cron'],
      { HOME: home },
    );
    assert.notEqual(r.status, 0);
    assert.match((r.stderr || '') + (r.stdout || ''), /schedule|cron|invalid/i);
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});

test('--node-bin override appears in substituted plist', () => {
  const home = mkSandbox();
  try {
    const r = runInstall(
      ['--print-only', '--target', 'macos', '--node-bin', '/opt/custom/bin/node'],
      { HOME: home },
    );
    assert.equal(r.status, 0, `stderr: ${r.stderr}`);
    assert.match(r.stdout, /\/opt\/custom\/bin\/node/);
  } finally {
    rmSync(home, { recursive: true, force: true });
  }
});