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 { mkdtempSync, mkdirSync, writeFileSync, readFileSync, existsSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { createLedger, addRepo, setRepoStatus, saveLedger } from '../../scanners/lib/campaign-ledger.mjs';

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

const NOW = '2026-06-23';
const SESSION = '20260623_101500';
const PLAN_BODY = '## Executive summary\n\n2 actions, 1 auto-fixable.\n\n## Action 1\nFix the thing.\n';

// Every test points --ledger-file + --sessions-dir at temp dirs, so the CLI never touches the
// real ~/.claude/ — hermetic by construction.
function runCli(extraArgs) {
  try {
    const stdout = execFileSync('node', [CLI, ...extraArgs], { encoding: 'utf-8', timeout: 15000 });
    return { status: 0, stdout };
  } catch (err) {
    return { status: err.status, stdout: err.stdout || '', stderr: err.stderr || '' };
  }
}

/**
 * Build a hermetic world: a temp dir holding the ledger + a sessions/ store + a repo/ dir.
 * `opts.withSession` links a sessionId; `opts.withPlan` writes that session's action-plan.md.
 */
function world({ withSession = true, withPlan = true } = {}) {
  const root = mkdtempSync(join(tmpdir(), 'camp-exp-'));
  const sessionsDir = join(root, 'sessions');
  const repoDir = join(root, 'repo');
  mkdirSync(sessionsDir, { recursive: true });
  mkdirSync(repoDir, { recursive: true });

  let l = createLedger({ now: NOW });
  l = addRepo(l, { path: repoDir, name: 'repo' }, { now: NOW });
  l = setRepoStatus(l, repoDir, 'planned', {
    now: NOW,
    findingsBySeverity: { critical: 0, high: 1, medium: 0, low: 2 },
    sessionId: withSession ? SESSION : undefined,
  });
  const ledgerFile = join(root, 'campaign-ledger.json');
  // saveLedger is async via the lib; call synchronously through writeFileSync to keep tests simple.
  writeFileSync(ledgerFile, `${JSON.stringify(l, null, 2)}\n`);

  if (withSession && withPlan) {
    mkdirSync(join(sessionsDir, SESSION), { recursive: true });
    writeFileSync(join(sessionsDir, SESSION, 'action-plan.md'), PLAN_BODY);
  }
  return { root, sessionsDir, repoDir, ledgerFile };
}

const baseArgs = (w) => ['--ledger-file', w.ledgerFile, '--sessions-dir', w.sessionsDir, '--reference-date', NOW];

describe('campaign-export-cli — preview (read-only default)', () => {
  it('exits 0 and returns an exportable preview without writing', () => {
    const w = world();
    const { status, stdout } = runCli([...baseArgs(w), '--repo', w.repoDir]);
    assert.equal(status, 0);
    const out = JSON.parse(stdout);
    assert.equal(out.exportable, true);
    assert.equal(out.written, false);
    assert.deepEqual(out.problems, []);
    assert.equal(out.targetPath, join(w.repoDir, 'docs', `config-audit-plan-${SESSION}.md`));
    assert.ok(out.document.startsWith('# Config-Audit Action Plan — repo'));
    assert.ok(out.document.includes('## Action 1\nFix the thing.'));
    // preview must NOT have created the file
    assert.equal(existsSync(out.targetPath), false);
  });
});

describe('campaign-export-cli — --write', () => {
  it('writes a byte-exact copy of the assembled document into the repo docs/', () => {
    const w = world();
    const preview = JSON.parse(runCli([...baseArgs(w), '--repo', w.repoDir]).stdout);
    const { status, stdout } = runCli([...baseArgs(w), '--repo', w.repoDir, '--write']);
    assert.equal(status, 0);
    const out = JSON.parse(stdout);
    assert.equal(out.written, true);
    assert.ok(existsSync(out.targetPath));
    // file on disk equals the document the preview reported (no drift)
    assert.equal(readFileSync(out.targetPath, 'utf-8'), preview.document);
  });

  it('creates the docs/ dir if missing', () => {
    const w = world();
    const out = JSON.parse(runCli([...baseArgs(w), '--repo', w.repoDir, '--write']).stdout);
    assert.ok(existsSync(join(w.repoDir, 'docs')));
    assert.ok(existsSync(out.targetPath));
  });
});

describe('campaign-export-cli — gates (advisory exit 1)', () => {
  it('exits 1 with no-session-linked when the repo has no sessionId', () => {
    const w = world({ withSession: false });
    const { status, stdout } = runCli([...baseArgs(w), '--repo', w.repoDir]);
    assert.equal(status, 1);
    const out = JSON.parse(stdout);
    assert.equal(out.exportable, false);
    assert.deepEqual(out.problems, ['no-session-linked']);
    assert.equal(out.written, false);
  });

  it('exits 1 with no-action-plan when the linked session has no action-plan.md', () => {
    const w = world({ withPlan: false });
    const { status, stdout } = runCli([...baseArgs(w), '--repo', w.repoDir]);
    assert.equal(status, 1);
    const out = JSON.parse(stdout);
    assert.equal(out.exportable, false);
    assert.deepEqual(out.problems, ['no-action-plan']);
  });

  it('--write writes nothing when the repo is not exportable', () => {
    const w = world({ withPlan: false });
    const { status, stdout } = runCli([...baseArgs(w), '--repo', w.repoDir, '--write']);
    assert.equal(status, 1);
    assert.equal(JSON.parse(stdout).written, false);
    assert.equal(existsSync(join(w.repoDir, 'docs')), false);
  });
});

describe('campaign-export-cli — errors (exit 3)', () => {
  it('exits 3 when --repo is missing', () => {
    const w = world();
    assert.equal(runCli(baseArgs(w)).status, 3);
  });

  it('exits 3 when the repo is not tracked in the ledger', () => {
    const w = world();
    assert.equal(runCli([...baseArgs(w), '--repo', join(w.root, 'other')]).status, 3);
  });

  it('exits 3 when no ledger file exists', () => {
    const w = world();
    const status = runCli(['--ledger-file', join(w.root, 'nope.json'), '--sessions-dir', w.sessionsDir, '--repo', w.repoDir]).status;
    assert.equal(status, 3);
  });
});

describe('campaign-export-cli — --output-file', () => {
  it('writes the payload JSON to the file and stays silent on stdout', () => {
    const w = world();
    const out = join(w.root, 'report.json');
    const { stdout } = runCli([...baseArgs(w), '--repo', w.repoDir, '--output-file', out]);
    assert.equal(stdout.trim(), '');
    const written = JSON.parse(readFileSync(out, 'utf-8'));
    assert.equal(written.exportable, true);
    assert.equal(written.targetPath, join(w.repoDir, 'docs', `config-audit-plan-${SESSION}.md`));
  });
});