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'use strict';

const path = require('path');

const fs = require('fs');

const testFiles = ['genMatrix.js', '.github/workflows/build-test.yml'];

const nodeDirRegex = /^\d+$/;

const areTestFilesChanged = (changedFiles) =>

changedFiles.some((file) => testFiles.includes(file));

// Returns a list of the child directories in the given path

const getChildDirectories = (parent) =>

fs

.readdirSync(parent, { withFileTypes: true })

.filter((dirent) => dirent.isDirectory())

.map(({ name }) => path.resolve(parent, name));

const getNodeVersionDirs = (base) =>

getChildDirectories(base).filter((childPath) =>

nodeDirRegex.test(path.basename(childPath)),

);

// Returns the paths of Dockerfiles that are at: base/*/Dockerfile

const getDockerfilesInChildDirs = (base) =>

getChildDirectories(base).map((childDir) =>

path.resolve(childDir, 'Dockerfile'),

);

const getAllDockerfiles = (base) =>

getNodeVersionDirs(base).flatMap(getDockerfilesInChildDirs);

const getAffectedDockerfiles = (filesAdded, filesModified, filesRenamed) => {

const files = [...filesAdded, ...filesModified, ...filesRenamed];

// If the test files were changed, include everything

if (areTestFilesChanged(files)) {

console.log('Test files changed so scheduling all Dockerfiles');

return getAllDockerfiles(__dirname);

}

const modifiedDockerfiles = files.filter((file) =>

file.endsWith('/Dockerfile'),

);

// Get Dockerfiles affected by modified docker-entrypoint.sh files

const entrypointAffectedDockerfiles = files

.filter((file) => file.endsWith('/docker-entrypoint.sh'))

.map((file) => path.resolve(path.dirname(file), 'Dockerfile'));

return [...modifiedDockerfiles, ...entrypointAffectedDockerfiles];

};

const getFullNodeVersionFromDockerfile = (file) =>

fs.readFileSync(file, 'utf8').match(/^ENV NODE_VERSION=(\d*\.*\d*\.\d*)/m)[1];

const getDockerfileMatrixEntry = (file) => {

const [variant] = path.dirname(file).split(path.sep).slice(-1);

const version = getFullNodeVersionFromDockerfile(file);

return {

version,

variant,

};

};

const generateBuildMatrix = (filesAdded, filesModified, filesRenamed) => {

const dockerfiles = [

...new Set(getAffectedDockerfiles(filesAdded, filesModified, filesRenamed)),

];

const entries = dockerfiles.map(getDockerfileMatrixEntry);

// Return null if there are no entries so we can skip the matrix step

return entries.length ? { include: entries } : null;

};

module.exports = generateBuildMatrix;