/*
 * Copyright (C) 2026 Mateusz Gruszczyński @linuxiarz.pl
 * Source-Available Code / Dual-Licensed.
 * 
 * Free for non-commercial and evaluation use under terms of BSL/GPLv3.
 * Commercial or production use requires a valid paid license.
 * See LICENSE file in repository root for details.
 */

const VIEWS = new Set(["edit", "split", "preview"]);
const MODES = new Set(["markdown", "text"]);
const APP_URL_BASE = globalThis.location?.origin || "https://rustpad.invalid";

function appUrl(path) {
  try {
    const url = new URL(path, APP_URL_BASE);
    return url.origin === APP_URL_BASE ? url : null;
  } catch {
    return null;
  }
}

function relativeUrl(url) {
  return `${url.pathname}${url.search}${url.hash}`;
}

export function withShareToken(path, shareToken) {
  const url = appUrl(path);
  if (!url) return "/";
  const token = typeof shareToken === "string" ? shareToken.trim() : "";
  if (token) url.searchParams.set("share", token);
  else url.searchParams.delete("share");
  return relativeUrl(url);
}

export function editorResourceUrl(path, { shareToken = "", view = "split", mode = "markdown" } = {}) {
  const url = appUrl(path);
  if (!url) return "/";
  if (VIEWS.has(view)) url.searchParams.set("view", view);
  if (MODES.has(mode)) url.searchParams.set("mode", mode);
  const token = typeof shareToken === "string" ? shareToken.trim() : "";
  if (token) url.searchParams.set("share", token);
  else url.searchParams.delete("share");
  return relativeUrl(url);
}

export function readEditorState() {
  const params = new URLSearchParams(window.location.search);
  return {
    view: VIEWS.has(params.get("view")) ? params.get("view") : "split",
    mode: MODES.has(params.get("mode")) ? params.get("mode") : "markdown",
  };
}

export function writeEditorState(state, { replace = false } = {}) {
  const url = new URL(window.location.href);
  url.searchParams.set("view", state.view);
  url.searchParams.set("mode", state.mode);
  const method = replace ? "replaceState" : "pushState";
  window.history[method]({ ...state }, "", `${url.pathname}${url.search}${url.hash}`);
  window.dispatchEvent(new CustomEvent("rustpad:urlchange", { detail: { url: url.href } }));
  return url.href;
}

export function currentShareUrl(state) {
  const url = new URL(window.location.href);
  url.searchParams.set("view", state.view);
  url.searchParams.set("mode", state.mode);
  return url.href;
}