export type Workspace = { environment: string; cwd: string; platform: string };
export type Project = { name: string; roots: Workspace[]; defaultRoot: number };
export type ProjectInput = {
  name: string;
  roots: { environment: string; cwd: string }[];
  defaultRoot: number;
  moveConversations?: boolean;
};
export type ProjectIndex = Record<string, Project>;

export function workspacePath(path: string, platform: string): string {
  const normalized = platform === "win32" ? path.replaceAll("\\", "/").toLowerCase() : path;
  return normalized.replace(/\/+$/u, "") || "/";
}

/** The most specific workspace of this project containing the directory. */
export function workspaceFor(
  project: Project,
  binding: { environment: string; cwd: string } | undefined,
): Workspace | null {
  if (!binding) return null;
  let match: Workspace | null = null;
  let specificity = -1;
  for (const root of project.roots) {
    if (root.environment !== binding.environment) continue;
    const path = workspacePath(binding.cwd, root.platform);
    const base = workspacePath(root.cwd, root.platform);
    if (
      (path === base || path.startsWith(base === "/" ? "/" : base + "/")) &&
      base.length > specificity
    ) {
      match = root;
      specificity = base.length;
    }
  }
  return match;
}

/** The most specific workspace containing this directory, independent of fork ancestry. */
export function projectFor(
  projects: ProjectIndex,
  binding: { environment: string; cwd: string } | undefined,
): string | null {
  if (!binding) return null;
  let match: string | null = null;
  let specificity = -1;
  for (const [id, project] of Object.entries(projects)) {
    const root = workspaceFor(project, binding);
    if (!root) continue;
    const length = workspacePath(root.cwd, root.platform).length;
    if (length > specificity) {
      match = id;
      specificity = length;
    }
  }
  return match;
}