class SiteConfig {
  constructor({
    tangledUrl,
    knotDomain,
    ownerDid,
    repoName,
    branch,
    baseDir,
    notFoundFilepath,
  }) {
    if (tangledUrl) {
      if ([ownerDid, repoName].some((v) => !!v)) {
        throw new Error("Cannot use ownerDid and repoName with url");
      }
    }
    this.tangledUrl = tangledUrl;
    this.ownerDid = ownerDid;
    this.repoName = repoName;
    this.knotDomain = knotDomain;
    this.branch = branch;
    this.baseDir = baseDir;
    this.notFoundFilepath = notFoundFilepath;
  }
}

export class Config {
  constructor({ site, sites, subdomainOffset, cache = false }) {
    if (site && sites) {
      throw new Error("Cannot use both site and sites in config");
    }
    this.site = site ? new SiteConfig(site) : null;
    this.sites = sites ? sites.map((site) => new SiteConfig(site)) : null;
    this.subdomainOffset = subdomainOffset;
    this.cache = cache;
  }

  static async fromFile(filepath) {
    const fs = await import("fs");
    const config = JSON.parse(fs.readFileSync(filepath, "utf8"));
    return new Config(config);
  }
}