const path = require('path');
const { createHash } = require('crypto');
const { idempotencyDir } = require('./paths');
const { readJsonIfExists, writeJson } = require('./fs');

function recordPath(scope, key) {
  const hash = createHash('sha256').update(`${scope}:${key}`).digest('hex');
  return path.join(idempotencyDir, scope, `${hash}.json`);
}

async function getIdempotencyRecord(scope, key) {
  return readJsonIfExists(recordPath(scope, key));
}

async function saveIdempotencyRecord(scope, key, value) {
  await writeJson(recordPath(scope, key), {
    schema_version: 'v1',
    scope,
    key,
    value,
    created_at: new Date().toISOString(),
  });
}

module.exports = {
  getIdempotencyRecord,
  saveIdempotencyRecord,
};