import * as plugins from './smartnpm.plugins';
import { NpmRegistry } from './smartnpm.classes.npmregistry';
import { PackageDisttag } from './smartnpm.classes.packagedisttag';
import { PackageVersion, IVersionData } from './smartnpm.classes.packageversion';

export class NpmPackage {
  public static async createFromFullMetadataAndVersionData(
    npmRegistryArg: NpmRegistry,
    fullMetadataArg: plugins.packageJson.FullMetadata,
    versionsDataArg: {
      name: string;
      'dist-tags': { [key: string]: string };
      versions: { [key: string]: IVersionData };
    }
  ) {
    const npmPackage = new NpmPackage(npmRegistryArg);
    Object.assign(npmPackage, fullMetadataArg);
    npmPackage.allVersions = [];
    npmPackage.allDistTags = [];
    for (const versionArg of Object.keys(versionsDataArg.versions)) {
      const packageVersion = PackageVersion.createFromVersionData(
        versionsDataArg.versions[versionArg]
      );
      npmPackage.allVersions.push(packageVersion);
    }
    for (const distTagArg of Object.keys(versionsDataArg['dist-tags'])) {
      const packageDistTag = new PackageDisttag(
        distTagArg,
        versionsDataArg['dist-tags'][distTagArg]
      );
      npmPackage.allDistTags.push(packageDistTag);
    }
    return npmPackage;
  }

  // INSTANCE
  public name: string = null;
  public scope: string = null;
  public version: string = null;
  public allVersions: PackageVersion[];
  public allDistTags: PackageDisttag[];
  public description: string = null;
  public keywords: string[] = null;
  public date: string;
  public license: string;
  public links: {
    npm: string;
    homepage: string;
    repository: string;
    bugs: string;
  };
  public author: {
    name: 'Lossless GmbH';
  };
  public publisher: {
    username: 'gitzone';
    email: 'npm@git.zone';
  };
  public maintainers: any = null;
  public dist: {
    integrity: string;
    shasum: string;
    tarball: string;
  };
  public score: {
    final: number;
    detail: {
      quality: number;
      popularity: number;
      maintenance: number;
    };
  } = null;
  public searchScore: number = null;

  public npmRegistryRef: NpmRegistry;
  constructor(npmRegistryArg: NpmRegistry) {
    this.npmRegistryRef = npmRegistryArg;
  }

  /**
   * saves the package to disk
   */
  public async saveToDisk(targetDir: string) {
    const smartarchiveInstance = new plugins.smartarchive.SmartArchive();
    await smartarchiveInstance.extractArchiveFromUrlToFs(this.dist.tarball, targetDir);
  }

  /**
   * saves the complete package to cache
   */
  public async saveToCache() {}

  /**
   * get files from package
   */
  public async getFilesFromPackage(
    filePath: string,
    optionsArg: {
      distTag?: string;
      version?: string;
    },
    returnOnFirstArg = false
  ): Promise<plugins.smartfile.Smartfile[]> {
    const done = plugins.smartpromise.defer<plugins.smartfile.Smartfile[]>();
    const smartarchiveInstance = new plugins.smartarchive.SmartArchive();
    let tarballUrl = this.dist?.tarball;
    if (optionsArg?.version || optionsArg?.distTag) {
      if (optionsArg.distTag && optionsArg.version) {
        throw new Error('Please either specify version OR disttag, not both.');
      }
      let targetVersionString: string;
      if (optionsArg.distTag) {
        const targetDistTag = this.allDistTags.find((distTag) => {
          return distTag.name === optionsArg.distTag;
        });
        if (targetDistTag) {
          targetVersionString = targetDistTag.targetVersion;
        }
      } else {
        targetVersionString = optionsArg.version;
      }

      // lets find the best matching release
      const bestMatchingVersion = this.getBestMatchingVersion(targetVersionString);
      if (!bestMatchingVersion) {
        return null;
      }
      tarballUrl = this.allVersions.find(
        (packageVersion) => packageVersion.version === bestMatchingVersion
      ).dist.tarball;
    }
    const fileObservable = await smartarchiveInstance.extractArchiveFromUrlToObservable(tarballUrl);
    const wantedFilePath = plugins.path.join('package', filePath);
    const allMatchingFiles: plugins.smartfile.Smartfile[] = [];
    const subscription = fileObservable.subscribe(
      (fileArg) => {
        // returnOnFirstArg requires exact match
        if (returnOnFirstArg && fileArg.path === wantedFilePath) {
          // lets resolve with the wanted file
          done.resolve([fileArg]);
          subscription.unsubscribe();
        } else if(!returnOnFirstArg && fileArg.path.startsWith(wantedFilePath)) {
          allMatchingFiles.push(fileArg);
        }
      },
      (err) => {
        console.log(err);
      },
      () => {
        done.resolve(allMatchingFiles);
        subscription.unsubscribe();
      }
    );
    return done.promise;
  }

  /**
   * get files from package
   */
   public async getFileFromPackage(
    filePath: string,
    optionsArg?: {
      distTag?: string;
      version?: string;
    }
  ): Promise<plugins.smartfile.Smartfile> {
    const result = await this.getFilesFromPackage(filePath, optionsArg, true);
    return result[0] || null;
  }

  /**
   * updates the package with information from the registry
   */
  update() {}

  /** */
  public getBestMatchingVersion(versionArg: string): string {
    // lets find the best matching release
    const targetVersion = plugins.smartversion.SmartVersion.fromFuzzyString(versionArg);
    const versionStrings = this.allVersions.map((packageVersion) => packageVersion.version);
    const bestMatchingVersion = targetVersion.getBestMatch(versionStrings);
    if (!bestMatchingVersion) {
      return null;
    }
    return bestMatchingVersion;
  }
}