import * as github from '@actions/github'
import * as core from '@actions/core'
import {
  PackageCache,
  BuildTarget,
  Package,
  Snapshot,
  Manifest,
  submitSnapshot
} from '@github/dependency-submission-toolkit'
import fetch from 'cross-fetch'
import tar from 'tar'
import fs from 'fs'
import * as exec from '@actions/exec';
import dotenv from 'dotenv'
import { Context } from '@actions/github/lib/context'
import { unmockedModulePathPatterns } from './jest.config'
dotenv.config();

export default class ComponentDetection {
  public static componentDetectionPath = './component-detection';
  public static outputPath = './output.json';

  // This is the default entry point for this class. 
  static async scanAndGetManifests(path: string): Promise<Manifest[] | undefined> {
    await this.downloadLatestRelease();
    await this.runComponentDetection(path);
    return await this.getManifestsFromResults();
  }
  // Get the latest release from the component-detection repo, download the tarball, and extract it
  public static async downloadLatestRelease() {
    try {
      core.debug("Downloading latest release");
      const downloadURL = await this.getLatestReleaseURL();
      const blob = await (await fetch(new URL(downloadURL))).blob();
      const arrayBuffer = await blob.arrayBuffer();
      const buffer = Buffer.from(arrayBuffer);

      // Write the blob to a file
      core.debug("Writing binary to file");
      await fs.writeFileSync(this.componentDetectionPath, buffer, {mode: 0o777, flag: 'w'});
    } catch (error: any) {
      core.error(error);
    } 
  }

  // Run the component-detection CLI on the path specified
  public static async runComponentDetection(path: string) {
    core.info("Running component-detection");

    try {
      await exec.exec(`${this.componentDetectionPath} scan --SourceDirectory ${path} --ManifestFile ${this.outputPath} ${this.getComponentDetectionParameters()}`);
    } catch (error: any) {
      core.error(error);
    }
  }

  private static getComponentDetectionParameters(): string {
    var parameters = "";
    parameters += (core.getInput('directoryExclusionList')) ? ` --DirectoryExclusionList ${core.getInput('directoryExclusionList')}` : "";
    parameters += (core.getInput('detectorArgs')) ? ` --DetectorArgs ${core.getInput('detectorArgs')}` : "";
    parameters += (core.getInput('detectorsFilter')) ? ` --DetectorsFilter ${core.getInput('detectorsFilter')}` : "";
    parameters += (core.getInput('dockerImagesToScan')) ? ` --DockerImagesToScan ${core.getInput('dockerImagesToScan')}` : "";
    return parameters;
  }

  public static async getManifestsFromResults(): Promise<Manifest[]| undefined> {
    core.info("Getting manifests from results");
    // Parse the result file and add the packages to the package cache
    const packageCache = new PackageCache();
    const packages: Array<ComponentDetectionPackage>= [];
    
    const results = await fs.readFileSync(this.outputPath, 'utf8');
    
    var json: any = JSON.parse(results);
    json.componentsFound.forEach(async (component: any) => {
      const packageUrl = ComponentDetection.makePackageUrl(component.component.packageUrl);
      
      if (!packageCache.hasPackage(packageUrl)) {
          const pkg = new ComponentDetectionPackage(packageUrl, component.component.id, 
          component.isDevelopmentDependency,component.topLevelReferrers,component.locationsFoundAt, component.containerDetailIds, component.containerLayerIds);
        packageCache.addPackage(pkg);
        packages.push(pkg);
      }
    });

    // Set the transitive dependencies
    core.debug("Sorting out transitive dependencies");
    packages.forEach(async (pkg: ComponentDetectionPackage) => {
      pkg.topLevelReferrers.forEach(async (referrer: any) => {
        const referrerPackage = packageCache.lookupPackage(ComponentDetection.makePackageUrl(referrer.packageUrl));
        if (referrerPackage) {
          referrerPackage.dependsOn(pkg);
        }
      });
    });

    // Create manifests
    const manifests: Array<Manifest> = [];

    // Check the locationsFoundAt for every package and add each as a manifest
    packages.forEach(async (pkg: ComponentDetectionPackage) => {
      pkg.locationsFoundAt.forEach(async (location: any) => {
        if (!manifests.find((manifest: Manifest) => manifest.name == location)) {
          const manifest = new Manifest(location, location);
          manifests.push(manifest);
        }
        if (pkg.topLevelReferrers.length == 0) {
          manifests.find((manifest: Manifest) => manifest.name == location)?.addDirectDependency(pkg, ComponentDetection.getDependencyScope(pkg));
        } else {
          manifests.find((manifest: Manifest) => manifest.name == location)?.addIndirectDependency(pkg, ComponentDetection.getDependencyScope(pkg));        }
      });
    });
    return manifests;
  }

  private static getDependencyScope(pkg: ComponentDetectionPackage) {
    return pkg.isDevelopmentDependency ? 'development' : 'runtime'
  }

  private static makePackageUrl(packageUrlJson: any): string {
    var packageUrl = `${packageUrlJson.Scheme}:${packageUrlJson.Type}/`;
    if (packageUrlJson.Namespace) {
      packageUrl += `${packageUrlJson.Namespace.replaceAll("@", "%40")}/`;
    }
    packageUrl += `${packageUrlJson.Name.replaceAll("@", "%40")}`;
    if (packageUrlJson.Version) {
      packageUrl += `@${packageUrlJson.Version}`;
    }
    if (packageUrlJson.Qualifiers) {
      packageUrl += `?${packageUrlJson.Qualifiers}`;
    }
    return packageUrl;
  }

  private static async getLatestReleaseURL(): Promise<string> {
    const githubToken  = core.getInput('token') || process.env.GITHUB_TOKEN2 || "";  
    const octokit = github.getOctokit(githubToken);
    const owner = "microsoft";
    const repo = "component-detection";

    const latestRelease = await octokit.rest.repos.getLatestRelease({
      owner, repo
    });

    var downloadURL: string = "";
    latestRelease.data.assets.forEach((asset: any) => {
      if (asset.name === "component-detection-linux-x64") {
        downloadURL = asset.browser_download_url;
      }
    });

    return downloadURL;
  }
}

class ComponentDetectionPackage extends Package {
  
  constructor(packageUrl: string, public id: string, public isDevelopmentDependency:boolean, public topLevelReferrers: [], 
    public locationsFoundAt: [], public containerDetailIds: [], public containerLayerIds: []) {
    super(packageUrl);
  }
}










