// image-ref-utils.ts — 容器镜像引用解析与拼接 // Logan.Li

export interface ImageRefParts {
  repository: string;
  tag: string;
  /** digest 形式时存在，如 sha256:abc... // Logan.Li */
  digest?: string;
}

/** 解析镜像引用为仓库地址 + tag（兼容 registry:port 与 digest）// Logan.Li */
export function parseImageRef(image: string): ImageRefParts {
  const raw = (image || '').trim();
  if (!raw) return { repository: '', tag: 'latest' };

  if (raw.includes('@')) {
    const at = raw.lastIndexOf('@');
    return {
      repository: raw.slice(0, at),
      tag: raw.slice(at + 1),
      digest: raw.slice(at + 1),
    };
  }

  const slashIdx = raw.lastIndexOf('/');
  const colonIdx = raw.lastIndexOf(':');
  if (colonIdx > slashIdx) {
    return {
      repository: raw.slice(0, colonIdx),
      tag: raw.slice(colonIdx + 1) || 'latest',
    };
  }

  return { repository: raw, tag: 'latest' };
}

/** 拼接完整镜像引用 // Logan.Li */
export function joinImageRef(repository: string, tag: string): string {
  const repo = repository.trim();
  const t = tag.trim();
  if (!repo) return '';
  if (!t) return repo;
  if (t.startsWith('sha256:')) return `${repo}@${t}`;
  return `${repo}:${t}`;
}