import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
import { resolve, join } from 'node:path';
import { fileURLToPath } from 'node:url';
import { execFileSync } from 'node:child_process';
import { readFileSync, mkdtempSync, existsSync } from 'node:fs';
import { tmpdir } from 'node:os';
import {
  loadLedger,
  validateLedger,
  rollUp,
} from '../../scanners/lib/campaign-ledger.mjs';

const __dirname = fileURLToPath(new URL('.', import.meta.url));
const CLI = resolve(__dirname, '../../scanners/campaign-write-cli.mjs');

const NOW = '2026-06-22';

// Every test passes an explicit --ledger-file in a temp dir + an injected --reference-date,
// so the write-CLI never touches the real default path under HOME and never reads the clock.
// The suite is hermetic + deterministic by construction.
function runWrite(args) {
  try {
    const stdout = execFileSync('node', [CLI, ...args], { encoding: 'utf-8', timeout: 15000 });
    return { status: 0, stdout };
  } catch (err) {
    return { status: err.status, stdout: err.stdout || '', stderr: err.stderr || '' };
  }
}

function newDir() {
  return mkdtempSync(join(tmpdir(), 'camp-write-'));
}

// Read the persisted ledger back through the real lib so a test proves the on-disk file
// is exactly what the command layer would later load.
async function readLedger(file) {
  const ledger = await loadLedger(file);
  return { ledger, validation: validateLedger(ledger) };
}

describe('campaign-write-cli — init', () => {
  it('creates a valid, empty, versioned ledger (exit 0)', async () => {
    const dir = newDir();
    const file = join(dir, 'ledger.json');
    const { status, stdout } = runWrite(['init', '--ledger-file', file, '--reference-date', NOW]);
    assert.equal(status, 0);
    const out = JSON.parse(stdout);
    assert.equal(out.action, 'init');
    assert.equal(out.written, true);
    assert.equal(out.alreadyInitialized, false);
    assert.equal(out.ledgerPath, resolve(file));

    const { ledger, validation } = await readLedger(file);
    assert.ok(validation.valid, validation.errors.join('; '));
    assert.equal(ledger.schemaVersion, 1);
    assert.equal(ledger.createdDate, NOW);
    assert.equal(ledger.updatedDate, NOW);
    assert.deepEqual(ledger.repos, []);
  });

  it('refuses to clobber an existing ledger (exit 1, file untouched)', async () => {
    const dir = newDir();
    const file = join(dir, 'ledger.json');
    // First init, then add a repo so we can prove a second init does NOT wipe it.
    runWrite(['init', '--ledger-file', file, '--reference-date', NOW]);
    runWrite(['add', '/r/a', '--ledger-file', file, '--reference-date', NOW]);

    const { status, stdout } = runWrite(['init', '--ledger-file', file, '--reference-date', NOW]);
    assert.equal(status, 1, 'advisory: already initialized');
    const out = JSON.parse(stdout);
    assert.equal(out.written, false);
    assert.equal(out.alreadyInitialized, true);

    const { ledger } = await readLedger(file);
    assert.equal(ledger.repos.length, 1, 'existing repo preserved — not clobbered');
  });
});

describe('campaign-write-cli — add', () => {
  it('auto-initializes when no ledger exists, then adds repos (exit 0)', async () => {
    const dir = newDir();
    const file = join(dir, 'ledger.json');
    assert.ok(!existsSync(file));
    const { status, stdout } = runWrite([
      'add', '/r/a', '/r/b', '--ledger-file', file, '--reference-date', NOW,
    ]);
    assert.equal(status, 0);
    const out = JSON.parse(stdout);
    assert.equal(out.action, 'add');
    assert.equal(out.autoInitialized, true);
    assert.deepEqual(out.added.sort(), [resolve('/r/a'), resolve('/r/b')].sort());

    const { ledger, validation } = await readLedger(file);
    assert.ok(validation.valid, validation.errors.join('; '));
    assert.equal(ledger.repos.length, 2);
    assert.ok(ledger.repos.every((r) => r.status === 'pending'));
  });

  it('appends to an existing ledger and is idempotent on re-add (added vs skipped)', async () => {
    const dir = newDir();
    const file = join(dir, 'ledger.json');
    runWrite(['add', '/r/a', '/r/b', '--ledger-file', file, '--reference-date', NOW]);

    const { status, stdout } = runWrite([
      'add', '/r/a', '/r/c', '--ledger-file', file, '--reference-date', NOW,
    ]);
    assert.equal(status, 0);
    const out = JSON.parse(stdout);
    assert.equal(out.autoInitialized, false);
    assert.deepEqual(out.added, [resolve('/r/c')]);
    assert.deepEqual(out.skipped, [resolve('/r/a')]);

    const { ledger } = await readLedger(file);
    assert.equal(ledger.repos.length, 3);
  });

  it('uses --name for a single path; derives basenames for multiple', async () => {
    const dir = newDir();
    const solo = join(dir, 'solo.json');
    runWrite(['add', '/r/x', '--name', 'custom', '--ledger-file', solo, '--reference-date', NOW]);
    const { ledger: l1 } = await readLedger(solo);
    assert.equal(l1.repos[0].name, 'custom');

    const multi = join(dir, 'multi.json');
    runWrite(['add', '/r/alpha', '/r/beta', '--ledger-file', multi, '--reference-date', NOW]);
    const { ledger: l2 } = await readLedger(multi);
    assert.deepEqual(l2.repos.map((r) => r.name).sort(), ['alpha', 'beta']);
  });
});

describe('campaign-write-cli — set-status', () => {
  async function seeded() {
    const dir = newDir();
    const file = join(dir, 'ledger.json');
    runWrite(['add', '/r/a', '/r/b', '--ledger-file', file, '--reference-date', NOW]);
    return file;
  }

  it('transitions a tracked repo and attaches findings + session (exit 0)', async () => {
    const file = await seeded();
    const findings = { critical: 1, high: 2, medium: 0, low: 4 };
    const { status, stdout } = runWrite([
      'set-status', '/r/a', 'audited',
      '--findings', JSON.stringify(findings),
      '--session', '20260622_120000',
      '--ledger-file', file, '--reference-date', NOW,
    ]);
    assert.equal(status, 0);
    const out = JSON.parse(stdout);
    assert.equal(out.action, 'set-status');
    assert.equal(out.repo.status, 'audited');
    assert.deepEqual(out.repo.findingsBySeverity, findings);
    assert.equal(out.repo.sessionId, '20260622_120000');

    const { ledger } = await readLedger(file);
    assert.deepEqual(rollUp(ledger).bySeverity, findings);
    assert.deepEqual(out.rollUp, rollUp(ledger));
  });

  it('exits 3 on an invalid status', async () => {
    const file = await seeded();
    const { status } = runWrite([
      'set-status', '/r/a', 'nonsense', '--ledger-file', file, '--reference-date', NOW,
    ]);
    assert.equal(status, 3);
  });

  it('exits 3 when the repo is not tracked', async () => {
    const file = await seeded();
    const { status } = runWrite([
      'set-status', '/r/ghost', 'audited', '--ledger-file', file, '--reference-date', NOW,
    ]);
    assert.equal(status, 3);
  });

  it('exits 3 when no ledger exists yet', () => {
    const dir = newDir();
    const { status } = runWrite([
      'set-status', '/r/a', 'audited',
      '--ledger-file', join(dir, 'nope.json'), '--reference-date', NOW,
    ]);
    assert.equal(status, 3);
  });
});

describe('campaign-write-cli — determinism + --output-file', () => {
  it('stamps updatedDate from --reference-date and writes the payload to --output-file', async () => {
    const dir = newDir();
    const file = join(dir, 'ledger.json');
    runWrite(['init', '--ledger-file', file, '--reference-date', '2026-01-01']);
    const report = join(dir, 'report.json');
    const { stdout } = runWrite([
      'add', '/r/a', '--ledger-file', file, '--reference-date', '2026-03-15',
      '--output-file', report,
    ]);
    assert.equal(stdout.trim(), '', 'stdout is silent when --output-file is given');
    const written = JSON.parse(readFileSync(report, 'utf-8'));
    assert.equal(written.action, 'add');

    const { ledger } = await readLedger(file);
    assert.equal(ledger.createdDate, '2026-01-01', 'created stamp preserved');
    assert.equal(ledger.updatedDate, '2026-03-15', 'updated stamp from the later --reference-date');
  });

  it('exits 3 on an unknown subcommand', () => {
    const dir = newDir();
    const { status } = runWrite(['frobnicate', '--ledger-file', join(dir, 'x.json')]);
    assert.equal(status, 3);
  });
});