export default class Schema {

  static $$types = {};

  specification;

  constructor(specification) {
    this.specification = this.constructor.normalize(specification);
  }

  static defaultValue({$, concrete}) {
    if (concrete.defaultValue) {
      return concrete.defaultValue;
    }
    return $.defaultValue(concrete);
  }

  defaultValue() {
    return this.constructor.defaultValue(this.specification);
  }

  static deserialize(view, offset, {$, concrete}) {
    return $.deserialize(view, offset, concrete);
  }

  deserialize(view, offset = 0) {
    return this.constructor.deserialize(view, {value: offset}, this.specification);
  }

  static normalize({type, ...rest}) {
    const $$type = this.$$types[type];
    if (!$$type) {
      throw new TypeError(`unregistered schema type '${type}'`);
    }
    return {
      $: this.$$types[type],
      concrete: $$type.normalize ? $$type.normalize(rest) : rest,
      type,
    };
  }

  static serialize(source, view, offset, {$, concrete}) {
    return $.serialize(source, view, offset, concrete);
  }

  serialize(source, view, offset = 0) {
    this.constructor.serialize(source, view, offset, this.specification);
  }

  static sizeOf(instance, {$, concrete}) {
    return $.sizeOf(instance, concrete);
  }

  sizeOf(instance) {
    return this.constructor.sizeOf(instance, this.specification);
  }

  static size({$, concrete}) {
    return $.staticSizeOf(concrete);
  }

}

const imports = import.meta.glob('./schema-types/*.js', {eager: true, import: 'default'});
for (const path in imports) {
  Schema.$$types[path.replace(/.\/schema-types\/(.*)\.js/, '$1')] = imports[path](Schema);
}