//
//  Quick and dirty implementation for cds.validate() using db-level constraints
//

const cds = require('@sap/cds')
cds.on('served', ()=> {

  const $ = cds.validate; cds.validate = async function (entity, key, ...columns) {
    if (!entity.is_entity) return $(...arguments)
    if (entity.constraints) entity = entity.constraints
    if (key?.results) key = key.results[0].lastInsertRowid
    const checks = await SELECT.one.from (entity, key, columns.length && columns)
    const failed = {}; for (let c in checks) {
      if (c in entity.keys) continue
      if (c[0] == '_') continue
      if (checks[c]) failed[c] = checks[c]
    }
    if (Object.keys(failed).length) throw cds.error `Invalid input: ${failed}`
  }

})

Object.defineProperties (cds.entity.prototype, {
  constraints: { get() { return cds.model.definitions[this.name+'.constraints'] }},
  fields: { get() { return cds.model.definitions[this.name+'.field.control'] }},
})