import { afterAll, describe, it, expect } from 'vitest';
import { execFileSync, spawnSync } from 'node:child_process';
import { existsSync, mkdtempSync, readFileSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import { fileURLToPath } from 'node:url';
import {
  loadManifest,
  parseManifest,
  resolveOwnership,
  frameworkSubtreeRoots,
} from './manifest.js';

/**
 * Bash ↔ TS parity (#791, §6.1).
 *
 * The installer (bash) and the config adapter (TS) each resolve path ownership
 * from framework-manifest.txt. If the two resolvers disagreed on a single path,
 * an upgrade could protect a file on one code path and wipe it on the other —
 * exactly the two-copies drift that #631 patched by hand. This test drives the
 * bash resolver (`tools/_lib/manifest.sh`) as a subprocess and asserts it agrees
 * with the TS resolver for a broad set of paths spanning every ownership class.
 */

const FRAMEWORK_ROOT = fileURLToPath(new URL('../../framework', import.meta.url));
const MANIFEST_SH = join(FRAMEWORK_ROOT, 'tools', '_lib', 'manifest.sh');

const hasBash = (() => {
  try {
    execFileSync('bash', ['-c', 'true'], { stdio: 'ignore' });
    return true;
  } catch {
    return false;
  }
})();

function bashResolve(relPath: string): string {
  return execFileSync('bash', [MANIFEST_SH, 'resolve', relPath], {
    encoding: 'utf-8',
  }).trim();
}

/** Drive the bash resolver against an arbitrary manifest file (MANIFEST_FILE override). */
function bashResolveWith(manifestFile: string, relPath: string): string {
  return execFileSync('bash', [MANIFEST_SH, 'resolve', relPath], {
    encoding: 'utf-8',
    env: { ...process.env, MANIFEST_FILE: manifestFile },
  }).trim();
}

function bashSubtreeRoots(): string[] {
  return execFileSync('bash', [MANIFEST_SH, 'subtree-roots'], { encoding: 'utf-8' })
    .split('\n')
    .map((s) => s.trim())
    .filter((s) => s.length > 0);
}

/**
 * Drive the bash resolver CLI against a manifest file and report how it exited.
 * A fail-closed manifest must make the CLI exit non-zero with a message on
 * stderr — never exit 0 having silently resolved everything to operator.
 */
function bashCli(manifestFile: string): { status: number; stderr: string } {
  const res = spawnSync('bash', [MANIFEST_SH, 'resolve', 'CONSTITUTION.md'], {
    encoding: 'utf-8',
    env: { ...process.env, MANIFEST_FILE: manifestFile },
  });
  return { status: res.status ?? -1, stderr: res.stderr ?? '' };
}

// Paths spanning every ownership class: framework single-files, framework
// subtrees, operator declared trees, operator carve-out inside a framework
// subtree, local overlays, and deliberately UNANTICIPATED paths (fail-safe).
const PROBE_PATHS = [
  'CONSTITUTION.md',
  'AGENTS.md',
  'STANDARDS.md',
  'install.sh',
  'framework-manifest.txt',
  'guides/E2E-DELIVERY.md',
  'tools/git/pr-create.sh',
  'tools/_lib/manifest.sh',
  'defaults/SOUL.md',
  'fleet/README.md',
  'fleet/roles/coder.md',
  'fleet/roster.schema.json',
  'fleet/examples/general.yaml',
  // operator
  'SOUL.md',
  'USER.md',
  'TOOLS.md',
  'SOUL.local.md',
  'USER.local.md',
  'STANDARDS.local.md',
  'agents/coder0.conf',
  'policy/custom.md',
  'memory/note.md',
  'sources/skills/x.md',
  'credentials/c.json',
  'tools/_lib/credentials.json',
  'fleet/roster.yaml',
  'fleet/roster.json',
  'fleet/agents/coder0.env',
  'fleet/run/coder0.hb',
  // #797 Runtime Session Ledger — must resolve operator on both paths.
  'fleet/run/sessions/events.ndjson',
  'fleet/run/sessions/ledger.json',
  'fleet/backlog/data.db',
  'fleet/roles.local/custom.md',
  // unanticipated → operator (fail-safe)
  'harvester/sop.md',
  'unknown-operator-dir/x',
  'fleet/my-fleet.yaml',
  'random-root-file.md',
  'tools/some-new-framework-tool.sh',
];

describe.skipIf(!hasBash)('bash ↔ TS manifest parity (§6.1)', () => {
  it('the bash resolver CLI exists and is executable', () => {
    expect(existsSync(MANIFEST_SH)).toBe(true);
  });

  it('bash and TS resolve identical ownership for every probe path', () => {
    const manifest = loadManifest(FRAMEWORK_ROOT);
    const disagreements: Array<{ path: string; ts: string; bash: string }> = [];
    for (const p of PROBE_PATHS) {
      const ts = resolveOwnership(manifest, p);
      const bash = bashResolve(p);
      if (ts !== bash) disagreements.push({ path: p, ts, bash });
    }
    expect(disagreements).toEqual([]);
  });

  it('bash and TS agree on the framework subtree roots', () => {
    const manifest = loadManifest(FRAMEWORK_ROOT);
    expect(bashSubtreeRoots().sort()).toEqual(frameworkSubtreeRoots(manifest).sort());
  });
});

/**
 * Format-safety parity (#791, Decision 1 — the `.txt` line-oriented format is
 * accepted only because both resolvers agree on the format edge cases a hand-
 * edited text file invites: comments, blank lines, stray whitespace, duplicate
 * and overlapping globs (where deny-wins must resolve), and section ordering.
 * Each fixture is driven through BOTH resolvers (bash via MANIFEST_FILE, TS via
 * parseManifest) and must agree AND land on the expected ownership. Any
 * divergence here means the format itself is unsafe and must be fixed/converted.
 */
describe.skipIf(!hasBash)('bash ↔ TS manifest format-edge parity (§6.1, Decision 1)', () => {
  const tmp = mkdtempSync(join(tmpdir(), 'mf-parity-'));
  afterAll(() => rmSync(tmp, { recursive: true, force: true }));

  let fixtureSeq = 0;
  function writeFixture(text: string): string {
    const file = join(tmp, `manifest-${fixtureSeq++}.txt`);
    writeFileSync(file, text);
    return file;
  }

  // Both resolvers must agree, and on the expected value, for every probe.
  function expectParity(text: string, cases: ReadonlyArray<readonly [string, string]>): void {
    const file = writeFixture(text);
    const manifest = parseManifest(text);
    for (const [path, expected] of cases) {
      const ts = resolveOwnership(manifest, path);
      const bash = bashResolveWith(file, path);
      expect(bash, `bash disagrees with TS on ${path}`).toBe(ts);
      expect(ts, `ownership of ${path}`).toBe(expected);
    }
  }

  it('tolerates comments, blank lines, and leading/trailing whitespace identically', () => {
    // Entries and headers are padded with spaces/tabs; comments and blanks are
    // interleaved. Both resolvers must trim and ignore them the same way.
    const text = [
      '# leading comment',
      '   ',
      '\t[framework]  ',
      '   tools/**   ',
      '# mid-section comment',
      '',
      '\tguides/**\t',
      '  [operator] ',
      '\ttools/_lib/credentials.json  ',
      '*.local.md',
      '',
    ].join('\n');
    expectParity(text, [
      ['tools/git/pr-create.sh', 'framework'],
      ['guides/E2E-DELIVERY.md', 'framework'],
      ['tools/_lib/credentials.json', 'operator'], // deny-wins carve-out inside tools/**
      ['SOUL.local.md', 'operator'],
      ['nowhere/unknown.md', 'operator'], // negative probe: matches NO rule → operator
    ]);
  });

  it('resolves deny-wins for overlapping and duplicate globs identically', () => {
    // Framework claims tools/** (twice) and the overlapping tools/git/**;
    // operator carves out tools/_lib/**. Operator must win the overlap on both.
    const text = [
      '[framework]',
      'tools/**',
      'tools/**', // duplicate — must not change resolution
      'tools/git/**', // overlaps tools/**
      '[operator]',
      'tools/_lib/**',
    ].join('\n');
    expectParity(text, [
      ['tools/git/pr-create.sh', 'framework'],
      ['tools/other.sh', 'framework'],
      ['tools/_lib/credentials.json', 'operator'], // deny-wins over both framework globs
      ['tools/_lib/nested/deep.json', 'operator'],
    ]);
  });

  it('is independent of section and glob ordering', () => {
    // Same rule set, operator section first and entries reordered. Resolution
    // must be identical because deny-wins checks all operator globs before any
    // framework glob — order within or between sections cannot matter.
    const forward = [
      '[framework]',
      'guides/**',
      'tools/**',
      '[operator]',
      'tools/_lib/credentials.json',
      '*.local.md',
    ].join('\n');
    const reversed = [
      '[operator]',
      '*.local.md',
      'tools/_lib/credentials.json',
      '[framework]',
      'tools/**',
      'guides/**',
    ].join('\n');
    const probes: ReadonlyArray<readonly [string, string]> = [
      ['tools/git/pr-create.sh', 'framework'],
      ['guides/E2E-DELIVERY.md', 'framework'],
      ['tools/_lib/credentials.json', 'operator'],
      ['SOUL.local.md', 'operator'],
      ['unanticipated/path.md', 'operator'],
    ];
    expectParity(forward, probes);
    expectParity(reversed, probes);
    // And the two orderings agree path-for-path on both resolvers.
    const fFile = writeFixture(forward);
    const rFile = writeFixture(reversed);
    for (const [path] of probes) {
      expect(bashResolveWith(fFile, path)).toBe(bashResolveWith(rFile, path));
    }
  });

  it('defaults an unmatched path to operator on both resolvers (UNKNOWN → operator)', () => {
    // A manifest that names only a narrow framework slice. Everything else —
    // including paths under no rule at all — must fail safe to operator.
    const text = ['[framework]', 'guides/**', '[operator]', 'agents/**'].join('\n');
    expectParity(text, [
      ['guides/x.md', 'framework'],
      ['agents/coder0.conf', 'operator'],
      ['totally/unlisted/file.txt', 'operator'], // negative probe
      ['fleet/run/sessions/ledger.json', 'operator'], // unlisted → operator
      ['README.md', 'operator'],
    ]);
  });
});

/**
 * Failure-mode parity (#791 B2/B3). A bad manifest is the dangerous case: if the
 * two resolvers DISAGREED on rejection — one throwing while the other quietly
 * resolved everything to operator — an upgrade could fail loud on one code path
 * and no-op on the other. So for every malformed/empty/missing manifest, BOTH
 * must reject: TS throws, and the bash CLI exits non-zero with a stderr message.
 */
describe.skipIf(!hasBash)('bash ↔ TS manifest failure-mode parity (§6.1, B2/B3)', () => {
  const tmp = mkdtempSync(join(tmpdir(), 'mf-failmode-'));
  afterAll(() => rmSync(tmp, { recursive: true, force: true }));

  let seq = 0;
  function writeFixture(text: string): string {
    const file = join(tmp, `bad-manifest-${seq++}.txt`);
    writeFileSync(file, text);
    return file;
  }

  // TS throws AND bash CLI exits non-zero with a non-empty stderr — identical rejection.
  function expectBothReject(label: string, manifestFile: string): void {
    expect(() => parseManifestFile(manifestFile), `TS accepted ${label}`).toThrow();
    const cli = bashCli(manifestFile);
    expect(cli.status, `bash did not exit non-zero for ${label}`).not.toBe(0);
    expect(cli.stderr.trim().length, `bash was silent for ${label}`).toBeGreaterThan(0);
  }

  // Read the file for the TS side the same way loadManifest does, so both halves
  // see identical bytes (loadManifest keys off a directory, not an arbitrary file).
  function parseManifestFile(file: string): void {
    parseManifest(readFileSync(file, 'utf-8'));
  }

  it('both reject a completely empty manifest', () => {
    expectBothReject('empty', writeFixture(''));
  });

  it('both reject a comment/blank-only manifest', () => {
    expectBothReject('comment-only', writeFixture('# header only\n\n   \n'));
  });

  it('both reject an operator-only manifest (zero framework paths)', () => {
    expectBothReject('operator-only', writeFixture('[operator]\nSOUL.md\n*.local.md\n'));
  });

  it('both reject a [framework] section with no entries', () => {
    expectBothReject('empty-framework-section', writeFixture('[framework]\n[operator]\nSOUL.md\n'));
  });

  it('both reject a [framework] entry that normalizes to an empty glob (/)', () => {
    expectBothReject('root-slash-framework', writeFixture('[framework]\n/\n'));
  });

  it('both reject a [framework] entry that normalizes to nothing (./)', () => {
    expectBothReject('dot-slash-framework', writeFixture('[framework]\n./\n[operator]\nSOUL.md\n'));
  });

  it('both reject [framework] entries that are only bare dot segments', () => {
    expectBothReject('bare-dot-framework', writeFixture('[framework]\n.\n..\n'));
  });

  it('both reject an entry that appears before any section header', () => {
    expectBothReject('entry-before-header', writeFixture('stray.md\n[framework]\nguides/**\n'));
  });

  it('both reject an unknown section header', () => {
    expectBothReject('unknown-header', writeFixture('[bogus]\nx\n'));
  });

  it('both reject a missing manifest file (fail-closed, not empty result)', () => {
    const missing = join(tmp, 'does-not-exist.txt');
    // TS: loadManifest would throw a read error; here read-then-parse throws on read.
    expect(() => parseManifestFile(missing)).toThrow();
    const cli = bashCli(missing);
    expect(cli.status).not.toBe(0);
    expect(cli.stderr.trim().length).toBeGreaterThan(0);
  });
});