import os from "node:os";
import path from "node:path";
import { z } from "zod";

export const projectNameSchema = z
  .string()
  .trim()
  .min(1, "Enter a project name.")
  .max(64, "Project names must be 64 characters or fewer.")
  .regex(
    /^[a-zA-Z0-9][a-zA-Z0-9 _-]*$/,
    "Use letters, numbers, spaces, hyphens, or underscores.",
  )
  .refine((name) => !name.includes(".."), "Project names cannot contain '..'.");

export function getProjectsRoot() {
  return path.resolve(process.env.PROJECTS_ROOT || path.join(os.homedir(), "projects"));
}

export function getProjectPath(name: string) {
  const root = getProjectsRoot();
  const projectPath = path.resolve(root, name);

  if (projectPath === root || !projectPath.startsWith(`${root}${path.sep}`)) {
    throw new Error("The project path must remain inside the projects directory.");
  }

  return projectPath;
}