import * as path from 'path';

/**

* This function normalizes the provided paths and the existing paths in PYTHONPATH,

* adds the provided paths to PYTHONPATH if they're not already present,

* and then returns the updated PYTHONPATH.

*

* @param newPaths - An array of paths to be added to PYTHONPATH

* @param launchPythonPath - The initial PYTHONPATH

* @returns The updated PYTHONPATH

*/

export function addPathToPythonpath(newPaths: string[], launchPythonPath: string | undefined): string {

// Split PYTHONPATH into array of paths if it exists

let paths: string[];

if (!launchPythonPath) {

paths = [];

} else {

paths = launchPythonPath.split(path.delimiter);

}

// Normalize each path in the existing PYTHONPATH

paths = paths.map((p) => path.normalize(p));

// Normalize each new path and add it to PYTHONPATH if it's not already present

newPaths.forEach((newPath) => {

const normalizedNewPath: string = path.normalize(newPath);

if (!paths.includes(normalizedNewPath)) {

paths.push(normalizedNewPath);

}

});

// Join the paths with ':' to create the updated PYTHONPATH

const updatedPythonPath: string = paths.join(path.delimiter);

return updatedPythonPath;

}