import querystring from 'node:querystring';
import { isString } from '@sindresorhus/is';
import { logger } from '../../../logger/index.ts';
import { coerceArray } from '../../../util/array.ts';
import { regEx } from '../../../util/regex.ts';
import { parseSingleYaml } from '../../../util/yaml.ts';
import { GitTagsDatasource } from '../../datasource/git-tags/index.ts';
import { GithubTagsDatasource } from '../../datasource/github-tags/index.ts';
import { HelmDatasource } from '../../datasource/helm/index.ts';
import { getDep } from '../dockerfile/extract.ts';
import { getOciChartDep, isOCIRegistry } from '../helmv3/oci.ts';
import type {
  ExtractConfig,
  PackageDependency,
  PackageFileContent,
} from '../types.ts';
import type { HelmChart, Image, Kustomize } from './types.ts';

// URL specifications should follow the hashicorp URL format
// https://github.com/hashicorp/go-getter#url-format
const gitUrl = regEx(
  /^(?:git::)?(?<url>(?:(?:(?:http|https|ssh):\/\/)?(?:.*@)?)?(?<path>(?:[^:/\s]+(?::[0-9]+)?[:/])?(?<project>[^/\s]+\/[^/\s]+)))(?<subdir>[^?\s]*)\?(?<queryString>.+)$/,
);
// regex to match URLs with ".git" delimiter
const dotGitRegex = regEx(
  /^(?:git::)?(?<url>(?:(?:(?:http|https|ssh):\/\/)?(?:.*@)?)?(?<path>(?:[^:/\s]+(?::[0-9]+)?[:/])?(?<project>[^?\s]*(?:\.git))))(?<subdir>[^?\s]*)\?(?<queryString>.+)$/,
);
// regex to match URLs with "_git" delimiter
const underscoreGitRegex = regEx(
  /^(?:git::)?(?<url>(?:(?:(?:http|https|ssh):\/\/)?(?:.*@)?)?(?<path>(?:[^:/\s]+(?::[0-9]+)?[:/])?(?<project>[^?\s]*)(?:_git\/[^/\s]+)))(?<subdir>[^?\s]*)\?(?<queryString>.+)$/,
);
// regex to match URLs having an extra "//"
const gitUrlWithPath = regEx(
  /^(?:git::)?(?<url>(?:(?:(?:http|https|ssh):\/\/)?(?:.*@)?)?(?<path>(?:[^:/\s]+(?::[0-9]+)?[:/])(?<project>[^?\s]+)))(?:\/\/)(?<subdir>[^?\s]+)\?(?<queryString>.+)$/,
);

export function extractResource(base: string): PackageDependency | null {
  let match: RegExpExecArray | null;

  if (base.includes('_git')) {
    match = underscoreGitRegex.exec(base);
  } else if (base.includes('.git')) {
    match = dotGitRegex.exec(base);
  } else if (gitUrlWithPath.test(base)) {
    match = gitUrlWithPath.exec(base);
  } else {
    match = gitUrl.exec(base);
  }

  if (!match?.groups) {
    return null;
  }

  const { path, queryString } = match.groups;
  const params = querystring.parse(queryString);
  const refParam = Array.isArray(params.ref) ? params.ref[0] : params.ref;
  const versionParam = Array.isArray(params.version)
    ? params.version[0]
    : params.version;
  const currentValue = refParam ?? versionParam;
  if (!currentValue) {
    return null;
  }

  if (regEx(/(?:github\.com)(?::|\/)/).test(path)) {
    return {
      currentValue,
      datasource: GithubTagsDatasource.id,
      depName: match.groups.project.replace('.git', ''),
    };
  }

  return {
    datasource: GitTagsDatasource.id,
    depName: path.replace('.git', ''),
    packageName: match.groups.url,
    currentValue,
  };
}

export function extractImage(
  image: Image,
  aliases?: Record<string, string>,
): PackageDependency | null {
  if (!image.name) {
    return null;
  }
  const nameToSplit = image.newName ?? image.name;
  if (!isString(nameToSplit)) {
    logger.debug({ image }, 'Invalid image name');
    return null;
  }
  const nameDep = getDep(nameToSplit, false, aliases);
  const { depName } = nameDep;
  const { digest, newTag } = image;
  if (digest && newTag) {
    logger.debug(
      { newTag, digest },
      'Kustomize ignores newTag when digest is provided. Pick one, or use `newTag: tag@digest`',
    );
    return {
      depName,
      currentValue: newTag,
      currentDigest: digest,
      skipReason: 'invalid-dependency-specification',
    };
  }

  if (digest) {
    if (!isString(digest) || !digest.startsWith('sha256:')) {
      return {
        depName,
        currentValue: digest,
        skipReason: 'invalid-value',
      };
    }

    return {
      ...nameDep,
      currentDigest: digest,
      replaceString: digest,
    };
  }

  if (newTag) {
    if (!isString(newTag) || newTag.startsWith('sha256:')) {
      return {
        depName,
        currentValue: newTag,
        skipReason: 'invalid-value',
      };
    }

    const dep = getDep(`${depName}:${newTag}`, false, aliases);
    return {
      ...dep,
      replaceString: newTag,
      autoReplaceStringTemplate:
        '{{newValue}}{{#if newDigest}}@{{newDigest}}{{/if}}',
    };
  }

  if (image.newName) {
    return {
      ...nameDep,
      replaceString: image.newName,
    };
  }

  return null;
}

export function extractHelmChart(
  helmChart: HelmChart,
  aliases?: Record<string, string>,
): PackageDependency | null {
  if (!helmChart.name) {
    return null;
  }

  if (isOCIRegistry(helmChart.repo)) {
    return {
      ...getOciChartDep(helmChart.repo, helmChart.name, aliases),
      depName: helmChart.name,
      currentValue: helmChart.version,
    };
  }

  return {
    depName: helmChart.name,
    currentValue: helmChart.version,
    registryUrls: [helmChart.repo],
    datasource: HelmDatasource.id,
  };
}

export function parseKustomize(
  content: string,
  packageFile?: string,
): Kustomize | null {
  let pkg: Kustomize | null = null;
  try {
    // TODO: use schema (#9610)
    pkg = parseSingleYaml(content);
  } catch /* istanbul ignore next */ {
    logger.debug({ packageFile }, 'Error parsing kustomize file');
    return null;
  }

  if (!pkg || isString(pkg)) {
    return null;
  }

  pkg.kind ??= 'Kustomization';

  if (!['Kustomization', 'Component'].includes(pkg.kind)) {
    return null;
  }

  return pkg;
}

export function extractPackageFile(
  content: string,
  packageFile: string,
  config: ExtractConfig,
): PackageFileContent | null {
  logger.trace(`kustomize.extractPackageFile(${packageFile})`);
  const deps: PackageDependency[] = [];

  const pkg = parseKustomize(content, packageFile);
  if (!pkg) {
    return null;
  }

  // grab the remote bases
  for (const base of coerceArray(pkg.bases).filter(isString)) {
    const dep = extractResource(base);
    if (dep) {
      deps.push({
        ...dep,
        depType: pkg.kind,
      });
    }
  }

  // grab the remote resources
  for (const resource of coerceArray(pkg.resources).filter(isString)) {
    const dep = extractResource(resource);
    if (dep) {
      deps.push({
        ...dep,
        depType: pkg.kind,
      });
    }
  }

  // grab the remote components
  for (const component of coerceArray(pkg.components).filter(isString)) {
    const dep = extractResource(component);
    if (dep) {
      deps.push({
        ...dep,
        depType: pkg.kind,
      });
    }
  }

  // grab the image tags
  for (const image of coerceArray(pkg.images)) {
    const dep = extractImage(image, config.registryAliases);
    if (dep) {
      deps.push({
        ...dep,
        depType: pkg.kind,
      });
    }
  }

  // grab the helm charts
  for (const helmChart of coerceArray(pkg.helmCharts)) {
    const dep = extractHelmChart(helmChart, config.registryAliases);
    if (dep) {
      deps.push({
        ...dep,
        depType: 'HelmChart',
      });
    }
  }

  if (!deps.length) {
    return null;
  }
  return { deps };
}