const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');
const vm = require('node:vm');
const test = require('node:test');
const ts = require('typescript');

const appRoot = path.resolve(__dirname, '..');
const source = fs.readFileSync(path.join(appRoot, 'src/shared/lib/row-number.ts'), 'utf8');
const compiled = ts.transpileModule(source, {
  compilerOptions: { module: ts.ModuleKind.CommonJS },
}).outputText;
const moduleValue = { exports: {} };
vm.runInNewContext(compiled, { exports: moduleValue.exports, module: moduleValue });
const { getSnRowNumber } = moduleValue.exports;

test('non-paged rows start at one and do not depend on total count', () => {
  assert.deepEqual([0, 1, 2].map(rowIndex => getSnRowNumber({total: 50, rowIndex})), [1, 2, 3]);
  assert.equal(getSnRowNumber({total: 0, rowIndex: 0}), 1);
});
test('server pages continue numbering and preserve the final partial page', () => {
  assert.equal(getSnRowNumber({total: 23, rowIndex: 0, pageIndex: 0, pageSize: 10}), 1);
  assert.equal(getSnRowNumber({total: 23, rowIndex: 0, pageIndex: 1, pageSize: 10}), 11);
  assert.equal(getSnRowNumber({total: 23, rowIndex: 2, pageIndex: 2, pageSize: 10}), 23);
});
test('page-size changes and refreshed result order use the new positions', () => {
  assert.equal(getSnRowNumber({rowIndex: 0, pageIndex: 1, pageSize: 20}), 21);
  assert.equal(getSnRowNumber({rowIndex: 0, pageIndex: 0, pageSize: 20}), 1);
});

function sourceFiles(directory) {
  return fs.readdirSync(directory, {withFileTypes: true}).flatMap(entry => {
    const full = path.join(directory, entry.name);
    return entry.isDirectory() ? sourceFiles(full) : /\.tsx?$/.test(entry.name) ? [full] : [];
  });
}
test('SN does not use the shared descending helper or legacy descending row formulas', () => {
  for (const file of [...sourceFiles(path.join(appRoot, 'src')), ...sourceFiles(path.join(appRoot, 'app'))]) {
    const text = fs.readFileSync(file, 'utf8');
    assert.doesNotMatch(text, /getStandardRowNumber/, file);
    assert.doesNotMatch(text, /(?:rowNumber|rowNo|no)\s*:\s*(?:[\w.]+\s*-\s*(?:index|detailIndex)|total\w*\s*-)/, file);
    assert.doesNotMatch(text, /total(?:Elements|Count)?\s*-\s*\(\(?[^;{}\n]*(?:index|sourceIndex)/, file);
  }
});