import path from "node:path";
import { normalizeWorkspacePath } from "./computer-support.js";

export const PROJECT_WORKSPACE_PREFIX = "project";

export function isProjectWorkspacePath(storedPath: string): boolean {
  const normalized = normalizeWorkspacePath(storedPath);
  return (
    normalized === PROJECT_WORKSPACE_PREFIX || normalized.startsWith(`${PROJECT_WORKSPACE_PREFIX}/`)
  );
}

export function projectWorkspaceRelativePath(storedPath: string): string {
  const normalized = normalizeWorkspacePath(storedPath);
  if (normalized === PROJECT_WORKSPACE_PREFIX) return "";
  if (!normalized.startsWith(`${PROJECT_WORKSPACE_PREFIX}/`)) {
    throw new Error("Path is not under the project workspace");
  }
  return normalized.slice(`${PROJECT_WORKSPACE_PREFIX}/`.length);
}

export function resolveProjectHostPath(workspaceRoot: string, storedPath: string): string {
  const relative = projectWorkspaceRelativePath(storedPath);
  const resolvedRoot = path.resolve(workspaceRoot);
  const candidate = relative ? path.resolve(resolvedRoot, relative) : resolvedRoot;
  const relativeToRoot = path.relative(resolvedRoot, candidate);
  if (relativeToRoot.startsWith("..") || path.isAbsolute(relativeToRoot)) {
    throw new Error("Path escapes the project workspace");
  }
  return candidate;
}