// Copyright 2026 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

export class SecurityOrigin {
  #urlOrigin?: string;
  #opaqueUuid?: string;

  private constructor(urlOrigin?: string, opaqueUuid?: string) {
    this.#urlOrigin = urlOrigin;
    this.#opaqueUuid = opaqueUuid;
  }

  static create(urlOrigin: string): SecurityOrigin {
    return new SecurityOrigin(urlOrigin, undefined);
  }

  static createUniqueOpaque(): SecurityOrigin {
    return new SecurityOrigin(undefined, crypto.randomUUID());
  }

  isSameOriginWith(other: SecurityOrigin): boolean {
    if (this.#opaqueUuid || other.#opaqueUuid) {
      return this.#opaqueUuid === other.#opaqueUuid;
    }
    if (this.isOpaque() || other.isOpaque()) {
      return false;
    }
    return this.#urlOrigin === other.#urlOrigin && this.#urlOrigin !== undefined;
  }

  isOpaque(): boolean {
    if (this.#opaqueUuid !== undefined) {
      return true;
    }
    if (this.#urlOrigin) {
      const lower = this.#urlOrigin.toLowerCase();
      return lower === '' || lower === 'null' || lower === 'data:' || lower.startsWith('about') ||
          lower.startsWith('blob:about') || lower.startsWith('blob:data') || lower.startsWith('blob:null') ||
          lower.startsWith('detached') || lower.startsWith('undefined');
    }
    return false;
  }

  siteId(): string {
    return this.#opaqueUuid ?? (this.#urlOrigin ?? 'unknown-origin');
  }
}