// tests/kb-update/test-decisions-actions.test.mjs
// Spor B / B3 (Sesjon 16): the ADDITIVE skill-level action layer on the lag-2
// decision ledger. The URL-keyed `decisions` map (Spor A) is untouched — its
// contract is covered by test-decisions-io.test.mjs, which stays green
// unmodified, proving the extension is non-regressive. Here we cover only the
// new `actions` collection: actionKey dedup, recordAction (pure), isActionDecided,
// listActions, and backward-compatible normalization of pre-action ledgers.

import { test } from 'node:test';
import assert from 'node:assert/strict';
import { mkdtempSync, rmSync, writeFileSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';
import {
  createLedger,
  loadDecisions,
  saveDecisions,
  recordDecision,
  isDecided,
  actionKey,
  isActionDecided,
  recordAction,
  listActions,
  setActionStatus,
} from '../../scripts/kb-update/lib/decisions-io.mjs';

function withTmp(fn) {
  const dir = mkdtempSync(join(tmpdir(), 'dec-act-test-'));
  try {
    return fn(dir);
  } finally {
    rmSync(dir, { recursive: true, force: true });
  }
}

const MERGE = {
  operation_type: 'merge_skills',
  status: 'pending',
  decided_at: '2026-06-20',
  targets: { absorber: 'ms-ai-infrastructure', absorbed: 'ms-ai-engineering' },
  guardrail: { ok: true },
  note: 'dry-run',
};

// --- scaffold now carries an empty actions collection (additive) ---

test('createLedger — additive actions:{} alongside untouched decisions:{}', () => {
  const led = createLedger();
  assert.equal(led.version, 1, 'version stays 1 — no migration needed');
  assert.deepEqual(led.decisions, {}, 'URL-keyed map unchanged');
  assert.deepEqual(led.actions, {}, 'new skill-op collection present and empty');
});

// --- actionKey — deterministic dedup key ---

test('actionKey — merge_skills key is symmetric on the pair (direction-agnostic dedup)', () => {
  const k1 = actionKey(MERGE);
  const k2 = actionKey({
    ...MERGE,
    targets: { absorber: 'ms-ai-engineering', absorbed: 'ms-ai-infrastructure' },
  });
  assert.equal(k1, k2, 'merging A<-B and B<-A must dedup to the same key');
  assert.equal(k1, 'merge_skills:ms-ai-engineering+ms-ai-infrastructure');
});

test('actionKey — single-skill ops keyed by their one target', () => {
  assert.equal(
    actionKey({ operation_type: 'sanitize_skill', targets: { skill: 'ms-ai-governance' } }),
    'sanitize_skill:ms-ai-governance',
  );
  assert.equal(
    actionKey({ operation_type: 'create_skill', targets: { name: 'ms-power-platform' } }),
    'create_skill:ms-power-platform',
  );
});

// --- recordAction — pure, mirrors recordDecision ---

test('recordAction — records under actionKey, returns new ledger, does not mutate input', () => {
  const led = createLedger();
  const next = recordAction(led, MERGE);
  assert.deepEqual(led.actions, {}, 'input untouched');
  assert.notEqual(next, led);
  assert.equal(next.actions['merge_skills:ms-ai-engineering+ms-ai-infrastructure'].status, 'pending');
});

test('recordAction — advances updated_at to the action date', () => {
  const next = recordAction(createLedger(), MERGE);
  assert.equal(next.updated_at, '2026-06-20');
});

test('recordAction — does NOT touch the URL-keyed decisions map', () => {
  let led = recordDecision(createLedger(), 'https://learn.microsoft.com/x', {
    status: 'approved',
    decided_at: '2026-06-19',
  });
  const next = recordAction(led, MERGE);
  assert.equal(isDecided(next, 'https://learn.microsoft.com/x'), true, 'URL decision survives');
  assert.equal(isActionDecided(next, actionKey(MERGE)), true, 'action recorded alongside');
});

// --- isActionDecided — dedup gate (policy A: any status counts) ---

test('isActionDecided — true for ANY recorded status, false when absent', () => {
  let led = createLedger();
  assert.equal(isActionDecided(led, actionKey(MERGE)), false);
  led = recordAction(led, { ...MERGE, status: 'rejected' });
  assert.equal(isActionDecided(led, actionKey(MERGE)), true, 'rejected merge still dedups (policy A)');
});

// --- listActions — flat list, optional status filter ---

test('listActions — returns all entries, filters by status when given', () => {
  let led = createLedger();
  led = recordAction(led, MERGE); // pending
  led = recordAction(led, {
    operation_type: 'sanitize_skill',
    status: 'approved',
    decided_at: '2026-06-20',
    targets: { skill: 'ms-ai-governance' },
  });
  assert.equal(listActions(led).length, 2);
  assert.deepEqual(
    listActions(led, 'pending').map((a) => a.operation_type),
    ['merge_skills'],
  );
  assert.deepEqual(
    listActions(led, 'approved').map((a) => a.operation_type),
    ['sanitize_skill'],
  );
});

// --- backward compatibility: a pre-action ledger on disk loads cleanly ---

test('loadDecisions — normalizes a pre-action (no actions key) ledger to actions:{}', () => {
  withTmp((dir) => {
    // Simulate an old on-disk ledger written before the action layer existed.
    writeFileSync(
      join(dir, 'decisions.json'),
      JSON.stringify({ version: 1, updated_at: null, decisions: {} }, null, 2),
    );
    const led = loadDecisions(dir);
    assert.deepEqual(led.actions, {}, 'missing actions key is backfilled, not undefined');
    // and recording an action on the loaded ledger works
    const next = recordAction(led, MERGE);
    assert.equal(isActionDecided(next, actionKey(MERGE)), true);
  });
});

test('saveDecisions + loadDecisions — actions round-trip through disk', () => {
  withTmp((dir) => {
    const led = recordAction(createLedger(), MERGE);
    saveDecisions(led, dir);
    const back = loadDecisions(dir);
    assert.deepEqual(back, led);
  });
});

// --- setActionStatus — pure status transition (Sesjon 18: gates the apply-path) ---
// The apply-path flips an operator-approved entry approved -> applied AFTER a
// successful skills/ mutation. setActionStatus is the one pure primitive that
// records that transition; it preserves every other field (targets, guardrail).

test('setActionStatus — transitions status, preserves targets+guardrail, is pure', () => {
  const led = recordAction(createLedger(), { ...MERGE, status: 'approved' });
  const key = actionKey(MERGE);
  const next = setActionStatus(led, key, 'applied', '2026-06-21');

  assert.equal(led.actions[key].status, 'approved', 'input ledger untouched (pure)');
  assert.notEqual(next, led);
  assert.equal(next.actions[key].status, 'applied');
  assert.deepEqual(next.actions[key].targets, MERGE.targets, 'targets preserved');
  assert.deepEqual(next.actions[key].guardrail, MERGE.guardrail, 'guardrail preserved');
});

test('setActionStatus — advances updated_at to the transition date', () => {
  const led = recordAction(createLedger(), { ...MERGE, status: 'approved' });
  const next = setActionStatus(led, actionKey(MERGE), 'applied', '2026-06-21');
  assert.equal(next.actions[actionKey(MERGE)].decided_at, '2026-06-21', 'entry date advances');
  assert.equal(next.updated_at, '2026-06-21');
});

test('setActionStatus — without a date, keeps the entry decided_at and ledger updated_at', () => {
  let led = recordAction(createLedger(), { ...MERGE, status: 'approved' }); // decided_at 2026-06-20
  const next = setActionStatus(led, actionKey(MERGE), 'applied');
  assert.equal(next.actions[actionKey(MERGE)].decided_at, '2026-06-20', 'no date -> keep original');
});

test('setActionStatus — throws on an unknown action key (cannot transition a non-entry)', () => {
  const led = recordAction(createLedger(), { ...MERGE, status: 'approved' });
  assert.throws(() => setActionStatus(led, 'sanitize_skill:ghost', 'applied'), /no action|ghost/i);
});

test('setActionStatus — leaves the URL-keyed decisions map and sibling actions untouched', () => {
  let led = recordDecision(createLedger(), 'https://learn.microsoft.com/x', {
    status: 'approved',
    decided_at: '2026-06-19',
  });
  led = recordAction(led, { ...MERGE, status: 'approved' });
  led = recordAction(led, {
    operation_type: 'sanitize_skill',
    status: 'approved',
    decided_at: '2026-06-20',
    targets: { skill: 'ms-ai-governance' },
    guardrail: { ok: true },
  });
  const next = setActionStatus(led, actionKey(MERGE), 'applied', '2026-06-21');

  assert.equal(isDecided(next, 'https://learn.microsoft.com/x'), true, 'URL decision survives');
  assert.equal(
    next.actions['sanitize_skill:ms-ai-governance'].status,
    'approved',
    'sibling action untouched',
  );
});