import upath from 'upath';
import { logger } from '../../../logger/index.ts';
import { regEx } from '../../../util/regex.ts';
import { parseUrl } from '../../../util/url.ts';
import type { PackageDependency } from '../types.ts';
import { getOciChartDep } from './oci.ts';
import type { ChartDefinition, Repository } from './types.ts';

export function parseRepository(
  depName: string,
  repositoryURL: string,
): PackageDependency {
  const res: PackageDependency = {};

  const url = parseUrl(repositoryURL);
  if (!url) {
    logger.debug({ repositoryURL }, 'Error parsing url');
    res.skipReason = 'invalid-url';
    return res;
  }
  switch (url.protocol) {
    case 'oci:':
      return getOciChartDep(repositoryURL, depName);
    case 'file:':
      res.skipReason = 'local-dependency';
      break;
    default:
      res.registryUrls = [repositoryURL];
  }
  return res;
}

/**
 * Resolves alias in repository string.
 *
 * @param repository to be resolved string
 * @param registryAliases Records containing registryAliases as key and to be resolved URLs as values
 *
 * @returns  resolved alias. If repository does not contain an alias the repository string will be returned. Should it contain an alias which can not be resolved using `registryAliases`, null will be returned
 */
export function resolveAlias(
  repository: string,
  registryAliases: Record<string, string>,
): string | null {
  if (!isAlias(repository)) {
    return repository;
  }

  const repoWithPrefixRemoved = repository.slice(
    repository.startsWith('@') ? 1 : 6,
  );
  const alias = registryAliases[repoWithPrefixRemoved];
  if (alias) {
    return alias;
  }
  return null;
}

export function getRepositories(definitions: ChartDefinition[]): Repository[] {
  const repositoryList = definitions
    .flatMap((value) => value.dependencies)
    .filter((dependency) => dependency.repository) // only keep non-local references --> if no repository is defined the chart will be searched in charts/<name>
    .filter((dependency) => !isAlias(dependency.repository)) // do not add registryAliases
    .filter((dependency) => !dependency.repository.startsWith('file:')) // skip repositories which are locally referenced
    .map((dependency) => {
      // remove additional keys to prevent interference at deduplication
      return {
        name: dependency.name,
        repository: dependency.repository,
      };
    });
  const dedup = new Set();
  return repositoryList.filter((el) => {
    const duplicate = dedup.has(el.repository);
    dedup.add(el.repository);
    return !duplicate;
  });
}

export function isAlias(repository: string): boolean {
  if (!repository) {
    return false;
  }
  return repository.startsWith('@') || repository.startsWith('alias:');
}

export function aliasRecordToRepositories(
  registryAliases: Record<string, string>,
): Repository[] {
  return Object.entries(registryAliases)
    .filter(([, url]) => regEx(/^(?:https?|oci):\/\/.+/).exec(url))
    .map(([alias, url]) => {
      return {
        name: alias,
        repository: url,
      };
    });
}

export function isFileInDir(dir: string, file: string): boolean {
  return upath.dirname(file) === dir;
}