import * as core from '@actions/core';
import * as tc from '@actions/tool-cache';
import fs from 'fs';
import path from 'path';
import { extractJdkFile, getDownloadArchiveExtension } from '../../util';
import { JavaBase } from '../base-installer';
import { JavaDownloadRelease, JavaInstallerOptions, JavaInstallerResults } from '../base-models';
import { ICorrettoAllAvailableVersions, ICorettoAvailableVersions } from './models';

export class CorrettoDistribution extends JavaBase {
  constructor(installerOptions: JavaInstallerOptions) {
    super('Corretto', installerOptions);
  }

  protected async downloadTool(javaRelease: JavaDownloadRelease): Promise<JavaInstallerResults> {
    core.info(
      `Downloading Java ${javaRelease.version} (${this.distribution}) from ${javaRelease.url} ...`
    );
    const javaArchivePath = await tc.downloadTool(javaRelease.url);

    core.info(`Extracting Java archive...`);

    const extractedJavaPath = await extractJdkFile(javaArchivePath, getDownloadArchiveExtension());

    const archiveName = fs.readdirSync(extractedJavaPath)[0];
    const archivePath = path.join(extractedJavaPath, archiveName);
    const version = this.getToolcacheVersionName(javaRelease.version);

    const javaPath = await tc.cacheDir(
      archivePath,
      this.toolcacheFolderName,
      version,
      this.architecture
    );

    return { version: javaRelease.version, path: javaPath };
  }

  protected async findPackageForDownload(version: string): Promise<JavaDownloadRelease> {
    if (!this.stable) {
      throw new Error('Early access versions are not supported');
    }
    if (version.includes('.')) {
      throw new Error('Only major versions are supported');
    }
    const availableVersions = await this.getAvailableVersions();
    const matchingVersions = availableVersions
      .filter(item => item.version == version)
      .map(item => {
        return {
          version: item.correttoVersion,
          url: item.downloadLink
        } as JavaDownloadRelease;
      });

    const resolvedVersion = matchingVersions.length > 0 ? matchingVersions[0] : null;
    if (!resolvedVersion) {
      const availableOptions = availableVersions.map(item => item.version).join(', ');
      const availableOptionsMessage = availableOptions
        ? `\nAvailable versions: ${availableOptions}`
        : '';
      throw new Error(
        `Could not find satisfied version for SemVer '${version}'. ${availableOptionsMessage}`
      );
    }
    return resolvedVersion;
  }

  private async getAvailableVersions(): Promise<ICorettoAvailableVersions[]> {
    const platform = this.getPlatformOption();
    const arch = this.architecture;
    const imageType = this.packageType;

    if (core.isDebug()) {
      console.time('coretto-retrieve-available-versions');
    }

    const availableVersionsUrl =
      'https://corretto.github.io/corretto-downloads/latest_links/indexmap_with_checksum.json';
    const fetchCurrentVersions = await this.http.getJson<ICorrettoAllAvailableVersions>(
      availableVersionsUrl
    );
    const fetchedCurrentVersions = fetchCurrentVersions.result;
    if (!fetchedCurrentVersions) {
      throw Error(`Could not fetch latest corretto versions from ${availableVersionsUrl}`);
    }

    const eligbleVersions = fetchedCurrentVersions?.[platform]?.[arch]?.[imageType];
    const availableVersions = this.getAvailableVersionsForPlatform(eligbleVersions);

    if (core.isDebug()) {
      this.printAvailableVersions(availableVersions);
    }

    return availableVersions;
  }

  private getAvailableVersionsForPlatform(
    eligbleVersions: ICorrettoAllAvailableVersions['os']['arch']['imageType'] | undefined
  ): ICorettoAvailableVersions[] {
    const availableVersions: ICorettoAvailableVersions[] = [];

    for (const version in eligbleVersions) {
      const availableVersion = eligbleVersions[version];
      for (const fileType in availableVersion) {
        const skipNonExtractableBinaries = fileType != getDownloadArchiveExtension();
        if (skipNonExtractableBinaries) {
          continue;
        }
        const availableVersionDetails = availableVersion[fileType];
        const correttoVersion = this.getCorettoVersion(availableVersionDetails.resource);

        availableVersions.push({
          checksum: availableVersionDetails.checksum,
          checksum_sha256: availableVersionDetails.checksum_sha256,
          fileType,
          resource: availableVersionDetails.resource,
          downloadLink: `https://corretto.aws${availableVersionDetails.resource}`,
          version: version,
          correttoVersion
        });
      }
    }
    return availableVersions;
  }

  private printAvailableVersions(availableVersions: ICorettoAvailableVersions[]) {
    core.startGroup('Print information about available versions');
    console.timeEnd('coretto-retrieve-available-versions');
    console.log(`Available versions: [${availableVersions.length}]`);
    console.log(
      availableVersions.map(item => `${item.version}: ${item.correttoVersion}`).join(', ')
    );
    core.endGroup();
  }

  private getPlatformOption(): string {
    // Coretto has its own platform names so we need to map them
    switch (process.platform) {
      case 'darwin':
        return 'macos';
      case 'win32':
        return 'windows';
      default:
        return process.platform;
    }
  }

  private getCorettoVersion(resource: string): string {
    const regex = /(\d+.+)\//;
    const match = regex.exec(resource);
    if (match === null) {
      throw Error(`Could not parse corretto version from ${resource}`);
    }
    return match[1];
  }
}