import { Docker, DockerOptions } from "../../docker";
import { DockerFileAnalysis } from "../../docker-file";
import { getOsReleaseDynamic as getOsRelease } from "../../inputs/os-release";
import { OsReleaseFilePath } from "../../types";
import { OSRelease } from "../types";
import {
  tryAlpineRelease,
  tryDebianVersion,
  tryLsbRelease,
  tryOracleRelease,
  tryOSRelease,
  tryRedHatRelease,
} from "./release-analyzer";

export async function detect(
  targetImage: string,
  dockerfileAnalysis?: DockerFileAnalysis,
  options?: DockerOptions,
): Promise<OSRelease> {
  const docker = new Docker(targetImage, options);

  let osRelease = await getOsRelease(
    docker,
    OsReleaseFilePath.Linux,
  ).then((release) => tryOSRelease(release));

  // First generic fallback
  if (!osRelease) {
    osRelease = await getOsRelease(
      docker,
      OsReleaseFilePath.Lsb,
    ).then((release) => tryLsbRelease(release));
  }

  // Fallbacks for specific older distributions
  if (!osRelease) {
    osRelease = await getOsRelease(
      docker,
      OsReleaseFilePath.Debian,
    ).then((release) => tryDebianVersion(release));
  }

  if (!osRelease) {
    osRelease = await getOsRelease(
      docker,
      OsReleaseFilePath.Alpine,
    ).then((release) => tryAlpineRelease(release));
  }

  if (!osRelease) {
    osRelease = await getOsRelease(
      docker,
      OsReleaseFilePath.Oracle,
    ).then((release) => tryOracleRelease(release));
  }

  if (!osRelease) {
    osRelease = await getOsRelease(
      docker,
      OsReleaseFilePath.RedHat,
    ).then((release) => tryRedHatRelease(release));
  }

  if (!osRelease) {
    if (dockerfileAnalysis && dockerfileAnalysis.baseImage === "scratch") {
      // If the docker file was build from a scratch image
      // then we don't have a known OS
      osRelease = { name: "scratch", version: "0.0", prettyName: "" };
    } else {
      osRelease = { name: "unknown", version: "0.0", prettyName: "" };
    }
  }

  // Oracle Linux identifies itself as "ol"
  if (osRelease.name.trim() === "ol") {
    osRelease.name = "oracle";
  }

  return osRelease;
}