// tests/kb-eval/test-skill-ops-sanitize-retire.test.mjs
// Spor B / B3 (Sesjon 17): sanitize_skill + retire_skill as GATED DRY-RUN PLANNERS.
// Mirrors the merge_skills planner (S16): a pure core that mutates nothing and
// reads no disk, plus an impure shell that loads read-only and (with write:true)
// records a PENDING entry to decisions.json — NEVER touching skills/.
//
//  sanitize_skill — removes ONLY dead content (kb-integrity orphan/dead-path).
//    Guardrail: every removal must be a flagged dead file; curated refs are
//    never touched. A request to remove a curated ref FAILS the guardrail.
//  retire_skill — retires a WHOLE skill with MANDATORY archival (never a hard
//    delete). Guardrail: every reference file + SKILL.md is archived; a
//    hard-delete request is refused (ok=false).

import { test } from 'node:test';
import assert from 'node:assert/strict';
import { mkdtempSync, rmSync, mkdirSync, writeFileSync, existsSync, readdirSync, statSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import {
  planSanitizeSkill,
  planRetireSkill,
  loadSkillOrphans,
  runSanitizePlan,
  runRetirePlan,
  SANITIZE_OPERATION,
  RETIRE_OPERATION,
} from '../../scripts/kb-eval/lib/skill-ops.mjs';
import { loadDecisions, isActionDecided, actionKey } from '../../scripts/kb-update/lib/decisions-io.mjs';

// ===========================================================================
// (A) Pure core — planSanitizeSkill
// ===========================================================================

const S_CTX = {
  // skill-x has 4 refs; two are dead (orphan/dead-path), two are curated.
  refs: ['cat1/keep1.md', 'cat1/keep2.md', 'cat2/dead1.md', 'cat2/dead2.md'],
  orphans: ['cat2/dead1.md', 'cat2/dead2.md'],
  decided_at: '2026-06-20',
};

test('planSanitizeSkill — guardrail OK: default removes all dead-in-skill, curated untouched', () => {
  const { guardrail } = planSanitizeSkill('skill-x', S_CTX);
  assert.equal(guardrail.ok, true);
  assert.equal(guardrail.preCount, 4);
  assert.equal(guardrail.deadCount, 2);
  assert.equal(guardrail.removalCount, 2);
  assert.equal(guardrail.curatedCount, 2, 'two curated refs preserved');
  assert.equal(guardrail.postCount, 2, 'postCount = preCount - removals');
  assert.deepEqual(guardrail.illegalRemovals, []);
});

test('planSanitizeSkill — diff lists removals with reason and retains curated count', () => {
  const { diff } = planSanitizeSkill('skill-x', S_CTX);
  assert.deepEqual(
    diff.removals.map((r) => r.path),
    ['skills/skill-x/references/cat2/dead1.md', 'skills/skill-x/references/cat2/dead2.md'],
  );
  for (const r of diff.removals) assert.match(r.reason, /orphan|dead/i);
  assert.equal(diff.retainedCount, 2);
});

test('planSanitizeSkill — guardrail FAILS when a removal targets a CURATED (non-orphan) ref', () => {
  const { guardrail } = planSanitizeSkill('skill-x', { ...S_CTX, removals: ['cat1/keep1.md'] });
  assert.equal(guardrail.ok, false, 'deleting curated content must never be silently approved');
  assert.deepEqual(guardrail.illegalRemovals, ['cat1/keep1.md']);
});

test('planSanitizeSkill — guardrail FAILS when a removal points at a non-existent file', () => {
  const { guardrail } = planSanitizeSkill('skill-x', { ...S_CTX, removals: ['cat9/ghost.md'] });
  assert.equal(guardrail.ok, false);
  assert.deepEqual(guardrail.missingRemovals, ['cat9/ghost.md']);
});

test('planSanitizeSkill — no orphans -> empty removal, ok=true, postCount=preCount (no-op safe)', () => {
  const { guardrail, diff } = planSanitizeSkill('skill-x', { refs: ['c/a.md', 'c/b.md'], orphans: [] });
  assert.equal(guardrail.ok, true);
  assert.equal(guardrail.removalCount, 0);
  assert.equal(guardrail.postCount, 2);
  assert.deepEqual(diff.removals, []);
});

test('planSanitizeSkill — entry is a PENDING sanitize_skill action with the target skill', () => {
  const { entry } = planSanitizeSkill('skill-x', S_CTX);
  assert.equal(entry.operation_type, SANITIZE_OPERATION);
  assert.equal(entry.status, 'pending');
  assert.deepEqual(entry.targets, { skill: 'skill-x' });
  assert.equal(entry.decided_at, '2026-06-20');
  assert.equal(actionKey(entry), 'sanitize_skill:skill-x');
});

test('planSanitizeSkill — throws on missing skill', () => {
  assert.throws(() => planSanitizeSkill('', S_CTX), /skill/i);
});

// ===========================================================================
// (B) Pure core — planRetireSkill
// ===========================================================================

const R_CTX = {
  refs: ['cat1/a.md', 'cat1/b.md', 'cat2/c.md'],
  categorySkill: { cat1: 'doomed', cat2: 'doomed', cat3: 'survivor' },
  decided_at: '2026-06-20',
};

test('planRetireSkill — guardrail OK: archives every ref + SKILL.md (count = refs + 1)', () => {
  const { guardrail } = planRetireSkill('doomed', R_CTX);
  assert.equal(guardrail.ok, true);
  assert.equal(guardrail.refCount, 3);
  assert.equal(guardrail.expectedArchiveCount, 4, 'refs + SKILL.md');
  assert.equal(guardrail.archivedCount, 4);
  assert.equal(guardrail.hardDeleteRequested, false);
  assert.match(guardrail.archiveDir, /archive\/skills\/doomed/);
});

test('planRetireSkill — guardrail FAILS on a hard-delete request (no archival)', () => {
  const { guardrail } = planRetireSkill('doomed', { ...R_CTX, hardDelete: true });
  assert.equal(guardrail.ok, false, 'hard delete without archive is forbidden');
  assert.equal(guardrail.hardDeleteRequested, true);
  assert.equal(guardrail.archiveDir, null);
});

test('planRetireSkill — diff carries archive moves (incl SKILL.md), dir removal, and orphaned taxonomy', () => {
  const { diff } = planRetireSkill('doomed', R_CTX);
  assert.ok(
    diff.archiveMoves.some((m) => m.from === 'skills/doomed/SKILL.md'),
    'SKILL.md must be archived',
  );
  assert.equal(diff.archiveMoves.length, 4, '3 refs + SKILL.md');
  assert.equal(diff.removeSkillDir, 'skills/doomed');
  assert.deepEqual(
    diff.taxonomyOrphaned.map((t) => t.category).sort(),
    ['cat1', 'cat2'],
    'categories the retired skill owned need manual reassignment',
  );
});

test('planRetireSkill — entry is a PENDING retire_skill action with the target skill', () => {
  const { entry } = planRetireSkill('doomed', R_CTX);
  assert.equal(entry.operation_type, RETIRE_OPERATION);
  assert.equal(entry.status, 'pending');
  assert.deepEqual(entry.targets, { skill: 'doomed' });
  assert.equal(actionKey(entry), 'retire_skill:doomed');
});

test('planRetireSkill — throws on missing skill', () => {
  assert.throws(() => planRetireSkill('', R_CTX), /skill/i);
});

// ===========================================================================
// (C) Impure shell — loadSkillOrphans + runSanitizePlan / runRetirePlan
// ===========================================================================

// Fixture: a skills/ tree + an agents/ dir. A ref is "dead" iff its basename
// appears in NO agent file and NO SKILL.md (kb-integrity orphan semantics).
function withFixture(fn) {
  const root = mkdtempSync(join(tmpdir(), 'skillops-sr-'));
  const skillsDir = join(root, 'skills');
  const agentsDir = join(root, 'agents');
  const dataDir = join(root, 'data');
  const mkRef = (skill, cat, file, body) => {
    const dir = join(skillsDir, skill, 'references', cat);
    mkdirSync(dir, { recursive: true });
    writeFileSync(join(dir, file), body);
  };
  const mkSkillMd = (skill, body) => {
    mkdirSync(join(skillsDir, skill), { recursive: true });
    writeFileSync(join(skillsDir, skill, 'SKILL.md'), body);
  };
  // skill-a: live.md referenced by SKILL.md + agent; dead.md referenced nowhere.
  mkRef('skill-a', 'cat1', 'live.md', '# Live\n');
  mkRef('skill-a', 'cat1', 'dead.md', '# Dead\n');
  mkSkillMd('skill-a', '# skill-a\nSee references/cat1/live.md for details.\n');
  // skill-b: a small skill we will retire.
  mkRef('skill-b', 'cat3', 'b1.md', '# B1\n');
  mkSkillMd('skill-b', '# skill-b\nSee references/cat3/b1.md.\n');
  mkdirSync(agentsDir, { recursive: true });
  writeFileSync(join(agentsDir, 'agent.md'), 'Reads references/cat1/live.md and references/cat3/b1.md\n');
  mkdirSync(dataDir, { recursive: true });
  try {
    return fn({ skillsDir, agentsDir, dataDir });
  } finally {
    rmSync(root, { recursive: true, force: true });
  }
}

// Snapshot every file under a dir as path -> size:mtimeMs, for change detection.
function snapshot(dir) {
  const out = {};
  const walk = (d) => {
    for (const e of readdirSync(d, { withFileTypes: true })) {
      const p = join(d, e.name);
      if (e.isDirectory()) walk(p);
      else { const s = statSync(p); out[p] = `${s.size}:${s.mtimeMs}`; }
    }
  };
  walk(dir);
  return out;
}

test('loadSkillOrphans — read-only, flags refs whose basename is unreferenced by agents/SKILL.md', () => {
  withFixture(({ skillsDir, agentsDir }) => {
    const orphans = loadSkillOrphans(skillsDir, agentsDir);
    assert.deepEqual(orphans['skill-a'], ['cat1/dead.md'], 'only dead.md is orphaned');
    assert.deepEqual(orphans['skill-b'], [], 'b1.md is referenced -> not orphaned');
  });
});

test('runSanitizePlan --write — records a PENDING entry and touches NOTHING under skills/', () => {
  withFixture(({ skillsDir, agentsDir, dataDir }) => {
    const before = snapshot(skillsDir);
    const { entry, guardrail } = runSanitizePlan('skill-a', { skillsDir, agentsDir, dataDir, write: true, decided_at: '2026-06-20' });

    assert.equal(entry.status, 'pending');
    assert.equal(guardrail.ok, true);
    assert.equal(guardrail.removalCount, 1, 'only the dead orphan is removed');
    assert.equal(guardrail.curatedCount, 1, 'live.md preserved');

    const led = loadDecisions(dataDir);
    assert.equal(isActionDecided(led, actionKey(entry)), true);
    assert.equal(led.actions[actionKey(entry)].status, 'pending');

    assert.deepEqual(snapshot(skillsDir), before, 'sanitize dry-run must not write under skills/');
  });
});

test('runRetirePlan --write — records a PENDING entry and touches NOTHING under skills/', () => {
  withFixture(({ skillsDir, dataDir }) => {
    const before = snapshot(skillsDir);
    const { entry, guardrail } = runRetirePlan('skill-b', { skillsDir, dataDir, write: true, decided_at: '2026-06-20' });

    assert.equal(entry.status, 'pending');
    assert.equal(guardrail.ok, true);
    assert.equal(guardrail.expectedArchiveCount, 2, 'b1.md + SKILL.md');

    const led = loadDecisions(dataDir);
    assert.equal(isActionDecided(led, actionKey(entry)), true);

    assert.deepEqual(snapshot(skillsDir), before, 'retire dry-run must not write under skills/');
  });
});

test('runSanitizePlan without --write — pure preview, no ledger file created', () => {
  withFixture(({ skillsDir, agentsDir, dataDir }) => {
    const { entry } = runSanitizePlan('skill-a', { skillsDir, agentsDir, dataDir, write: false });
    assert.equal(entry.status, 'pending');
    assert.equal(existsSync(join(dataDir, 'decisions.json')), false, 'no write without --write');
  });
});