pullRequestProjectMatch.ts

import type { Project } from "./types";
import { parsePullRequestReferenceParts } from "./pullRequestReference";

function lastPathSegment(input: string): string {
  const segments = input.split(/[\\/]/).filter((segment) => segment.length > 0);
  return segments.at(-1) ?? "";
}

function normalizeRepositorySlug(input: string): string {
  return input
    .trim()
    .replace(/\.git$/i, "")
    .replace(/[_\s]+/g, "-")
    .replace(/-+/g, "-")
    .toLowerCase();
}

function projectRepositoryCandidates(project: Project): string[] {
  const candidates = [lastPathSegment(project.cwd), project.name]
    .map(normalizeRepositorySlug)
    .filter((candidate) => candidate.length > 0);

  return [...new Set(candidates)];
}

export function findProjectMatchingPullRequestReference(
  projects: readonly Project[],
  reference: string,
): Project | null {
  const parsed = parsePullRequestReferenceParts(reference);
  if (parsed?.kind !== "url" || !parsed.repo) {
    return null;
  }

  const targetRepository = normalizeRepositorySlug(parsed.repo);
  if (targetRepository.length === 0) {
    return null;
  }

  const matches = projects.filter((project) =>
    projectRepositoryCandidates(project).includes(targetRepository),
  );
  if (matches.length !== 1) {
    return null;
  }

  return matches[0] ?? null;
}