import test from 'node:test';
import assert from 'node:assert/strict';
import {readFileSync, existsSync, readdirSync} from 'node:fs';
import {createHash} from 'node:crypto';
import {calculate} from './ai-kpi.mjs';
const read = p => readFileSync(p, 'utf8');

test('each original metric survives exactly once on its own canonical Measurement page', () => {
  const manifest = JSON.parse(read('research/ai-adoption/measurement-migration.json'));
  const model = JSON.parse(read('research/ai-adoption/strategy-model.json'));
  const report = calculate(JSON.parse(read('scripts/fixtures/ai-kpi-synthetic.json')));
  assert.equal(manifest.metrics.length, 16);
  assert.deepEqual(manifest.metrics.map(m => m.title), model.kpis.map(k => k.name));
  assert.equal(new Set(manifest.metrics.map(m => m.docId)).size, 16);
  assert.equal(manifest.metrics.filter(m => m.status === 'prototype').length, 9);
  assert.equal(manifest.metrics.filter(m => m.status === 'unimplemented').length, 7);
  const overview = read('docs/strategy/measurement/index.mdx');
  for (const metric of manifest.metrics) {
    const page = read(`docs/strategy/${metric.docId}.mdx`);
    assert.equal(metric.url, `/strategy/${metric.docId}/`);
    assert.equal(metric.oldAnchor, metric.docId.split('/').at(-1));
    assert(page.includes(`slug: /${metric.docId}`));
    assert(overview.includes(`./${metric.oldAnchor}.mdx`));
    assert(page.includes('./collection-and-safeguards.mdx'));
    assert(page.includes('not installed collection'));
    assert(page.includes(metric.status === 'prototype' ? 'Prototype calculation' : 'Unimplemented metric'));
    assert.equal(Object.hasOwn(report.kpis, metric.calculationId), metric.status === 'prototype');
    const contract = page.split('{/* contract:start */}\n')[1]?.split('\n{/* contract:end */}')[0];
    assert(contract, metric.title);
    assert.equal(createHash('sha256').update(contract).digest('hex'), metric.contractSha256, metric.title);
    for (const field of ['Numerator','Denominator','Expression','Aggregation','Unit','Eligible population','Exclusions','Events and source','Owner / cadence','Missing evidence','Gaming and limits']) assert.equal(contract.split(`| ${field} |`).length, 2, `${metric.title}: ${field}`);
  }
  assert.equal(readdirSync('docs/strategy/measurement').filter(p => p.endsWith('.mdx')).length, 19);
  assert(!existsSync('docs/strategy/reference/measurement-contracts.mdx'));
  for (const part of manifest.shared) {
    const page = read(`docs/strategy/measurement/${part.slug}.mdx`);
    const body = page.split('{/* preserved:start */}\n')[1]?.split('\n{/* preserved:end */}')[0];
    // Only the cross-page navigation wording changes; hash all original substance.
    const original = body.replace('Use the [metric definitions](./index.mdx#metric-definitions)', 'Use the metric contracts below')
      // The old navigation named nonexistent roadmap gates. Restore only that
      // historical sentence for the migration hash; metric substance stays exact.
      .replace('Use these safeguards throughout the [Stage 01 journey](../stage-01-skills-adoption.mdx)', 'Introduction depends on the [roadmap gates](../roadmap.mdx)');
    assert.equal(createHash('sha256').update(original).digest('hex'), part.sha256);
  }
});