import { logger } from '../../../logger/index.ts';
import { coerceArray } from '../../../util/array.ts';
import { newlineRegex, regEx } from '../../../util/regex.ts';
import { MavenDatasource } from '../../datasource/maven/index.ts';
import type { PackageDependency, PackageFileContent } from '../types.ts';
import type { MavenVersionExtract, Version } from './types.ts';

// https://regex101.com/r/IcOs7P/1
const DISTRIBUTION_URL_REGEX = regEx(
  '^(?:distributionUrl\\s*=\\s*)(?<replaceString>\\S*-(?<version>\\d+\\.\\d+(?:\\.\\d+)?(?:-\\w+)*)-(?<type>bin|all)\\.zip)\\s*$',
);

const WRAPPER_URL_REGEX = regEx(
  '^(?:wrapperUrl\\s*=\\s*)(?<replaceString>\\S*-(?<version>\\d+\\.\\d+(?:\\.\\d+)?(?:-\\w+)*)(?:.jar))',
);

// https://regex101.com/r/7x1Otq/3
const WRAPPER_VERSION_REGEX = regEx(
  '^(?:wrapperVersion\\s*=\\s*)(?<replaceString>(?<version>\\d+\\.\\d+(?:\\.\\d+)?))',
);

const WRAPPER_VERSION_MVNW_REGEX = regEx(
  '^(#|@REM) Apache Maven Wrapper startup batch script, version (?<replaceString>(?<version>\\d+\\.\\d+(?:\\.\\d+)?))',
);

function extractVersions(fileContent: string): MavenVersionExtract {
  const lines = coerceArray(fileContent?.split(newlineRegex));
  const maven = extractLineInfo(lines, DISTRIBUTION_URL_REGEX) ?? undefined;
  const wrapper =
    extractLineInfo(
      lines,
      WRAPPER_URL_REGEX,
      WRAPPER_VERSION_REGEX,
      WRAPPER_VERSION_MVNW_REGEX,
    ) ?? undefined;
  return { maven, wrapper };
}

function extractLineInfo(lines: string[], ...regexs: RegExp[]): Version | null {
  for (const regex of regexs) {
    for (const line of lines) {
      if (line.match(regex)) {
        const match = regex.exec(line);
        if (match?.groups) {
          return {
            replaceString: match.groups.replaceString,
            version: match.groups.version,
          };
        }
      }
    }
  }
  return null;
}

export function extractPackageFile(
  fileContent: string,
): PackageFileContent | null {
  logger.trace('maven-wrapper.extractPackageFile()');
  const extractResult = extractVersions(fileContent);
  const deps = [];

  if (extractResult.maven?.version) {
    const maven: PackageDependency = {
      depName: 'maven',
      packageName: 'org.apache.maven:apache-maven',
      currentValue: extractResult.maven?.version,
      replaceString: extractResult.maven?.replaceString,
      datasource: MavenDatasource.id,
    };
    deps.push(maven);
  }

  if (extractResult.wrapper?.version) {
    const wrapper: PackageDependency = {
      depName: 'maven-wrapper',
      packageName: 'org.apache.maven.wrapper:maven-wrapper',
      currentValue: extractResult.wrapper?.version,
      replaceString: extractResult.wrapper?.replaceString,
      datasource: MavenDatasource.id,
    };
    deps.push(wrapper);
  }
  return deps.length ? { deps } : null;
}