import * as fs from "fs";

import * as actionsUtil from "./actions-util";
import { AnalysisKind } from "./analyses";
import { getApiClient, GitHubApiDetails } from "./api-client";
import { type CodeQL } from "./codeql";
import { Config } from "./config-utils";
import { Feature, FeatureEnablement } from "./feature-flags";
import * as gitUtils from "./git-utils";
import { Logger, withGroupAsync } from "./logging";
import { OverlayDatabaseMode } from "./overlay-database-utils";
import { RepositoryNwo } from "./repository";
import * as util from "./util";
import { bundleDb, CleanupLevel, parseGitHubUrl } from "./util";

/** Information about a database upload. */
export interface DatabaseUploadResult {
  /** Language of the database. */
  language: string;
  /** Size of the zipped database in bytes. */
  zipped_upload_size_bytes?: number;
  /** Whether the uploaded database is an overlay base. */
  is_overlay_base?: boolean;
  /** Time taken to upload database in milliseconds. */
  upload_duration_ms?: number;
  /** If there was an error during database upload, this is its message. */
  error?: string;
}

export async function cleanupAndUploadDatabases(
  repositoryNwo: RepositoryNwo,
  codeql: CodeQL,
  config: Config,
  apiDetails: GitHubApiDetails,
  features: FeatureEnablement,
  logger: Logger,
): Promise<DatabaseUploadResult[]> {
  if (actionsUtil.getRequiredInput("upload-database") !== "true") {
    logger.debug("Database upload disabled in workflow. Skipping upload.");
    return [];
  }

  if (!config.analysisKinds.includes(AnalysisKind.CodeScanning)) {
    logger.debug(
      `Not uploading database because 'analysis-kinds: ${AnalysisKind.CodeScanning}' is not enabled.`,
    );
    return [];
  }

  if (util.isInTestMode()) {
    logger.debug("In test mode. Skipping database upload.");
    return [];
  }

  // Do nothing when not running against github.com
  if (
    config.gitHubVersion.type !== util.GitHubVariant.DOTCOM &&
    config.gitHubVersion.type !== util.GitHubVariant.GHEC_DR
  ) {
    logger.debug("Not running against github.com or GHEC-DR. Skipping upload.");
    return [];
  }

  if (!(await gitUtils.isAnalyzingDefaultBranch())) {
    // We only want to upload a database if we are analyzing the default branch.
    logger.debug("Not analyzing default branch. Skipping upload.");
    return [];
  }

  // If config.overlayDatabaseMode is OverlayBase, then we have overlay base databases for all languages.
  const shouldUploadOverlayBase =
    config.overlayDatabaseMode === OverlayDatabaseMode.OverlayBase &&
    (await features.getValue(Feature.UploadOverlayDbToApi, codeql));
  const cleanupLevel = shouldUploadOverlayBase
    ? CleanupLevel.Overlay
    : CleanupLevel.Clear;

  // Clean up the database, since intermediate results may still be written to the
  // database if there is high RAM pressure.
  await withGroupAsync("Cleaning up databases", async () => {
    await codeql.databaseCleanupCluster(config, cleanupLevel);
  });

  const client = getApiClient();

  const uploadsUrl = new URL(parseGitHubUrl(apiDetails.url));
  uploadsUrl.hostname = `uploads.${uploadsUrl.hostname}`;

  // Octokit expects the baseUrl to not have a trailing slash,
  // but it is included by default in a URL.
  let uploadsBaseUrl = uploadsUrl.toString();
  if (uploadsBaseUrl.endsWith("/")) {
    uploadsBaseUrl = uploadsBaseUrl.slice(0, -1);
  }

  const reports: DatabaseUploadResult[] = [];
  for (const language of config.languages) {
    let bundledDbSize: number | undefined = undefined;
    try {
      // Upload the database bundle.
      // Although we are uploading arbitrary file contents to the API, it's worth
      // noting that it's the API's job to validate that the contents is acceptable.
      // This API method is available to anyone with write access to the repo.
      const bundledDb = await bundleDb(config, language, codeql, language);
      bundledDbSize = fs.statSync(bundledDb).size;
      const bundledDbReadStream = fs.createReadStream(bundledDb);
      const commitOid = await gitUtils.getCommitOid(
        actionsUtil.getRequiredInput("checkout_path"),
      );
      try {
        const startTime = performance.now();
        await client.request(
          `POST /repos/:owner/:repo/code-scanning/codeql/databases/:language?name=:name&commit_oid=:commit_oid`,
          {
            baseUrl: uploadsBaseUrl,
            owner: repositoryNwo.owner,
            repo: repositoryNwo.repo,
            language,
            name: `${language}-database`,
            commit_oid: commitOid,
            data: bundledDbReadStream,
            headers: {
              authorization: `token ${apiDetails.auth}`,
              "Content-Type": "application/zip",
              "Content-Length": bundledDbSize,
            },
          },
        );
        const endTime = performance.now();
        reports.push({
          language,
          zipped_upload_size_bytes: bundledDbSize,
          is_overlay_base: shouldUploadOverlayBase,
          upload_duration_ms: endTime - startTime,
        });
        logger.debug(`Successfully uploaded database for ${language}`);
      } finally {
        bundledDbReadStream.close();
      }
    } catch (e) {
      // Log a warning but don't fail the workflow
      logger.warning(
        `Failed to upload database for ${language}: ${util.getErrorMessage(e)}`,
      );
      reports.push({
        language,
        error: util.getErrorMessage(e),
        ...(bundledDbSize !== undefined
          ? { zipped_upload_size_bytes: bundledDbSize }
          : {}),
      });
    }
  }
  return reports;
}