import { posix, SEPARATOR } from "../../deps/path.ts";

/**
 * Convert the Windows paths (that use the separator "\")
 * to Posix paths (with the separator "/")
 * and ensure it starts with "/".
 */
export function normalizePath(path: string, rootToRemove?: string) {
  if (rootToRemove) {
    path = path.replace(rootToRemove, "");
  }

  if (SEPARATOR !== "/") {
    path = path.replaceAll(SEPARATOR, "/");

    // Is absolute Windows path (C:/...)
    if (path.includes(":/")) {
      if (rootToRemove && path.startsWith(rootToRemove)) {
        return posix.join("/", path.replace(rootToRemove, ""));
      }

      return path;
    }
  }

  const absolute = posix.join("/", path);
  return rootToRemove && absolute.startsWith(rootToRemove)
    ? posix.join("/", absolute.replace(rootToRemove, ""))
    : absolute;
}

/** Check if the path is an URL */
export function isUrl(path: string): boolean {
  return !!path.match(/^(https?|file):\/\//);
}

/** Check if the path is absolute */
export function isAbsolutePath(path: string): boolean {
  return SEPARATOR !== "/" ? /^\w:[\/\\]/.test(path) : path.startsWith("/");
}

/** Replace the extension of a path */
export function replaceExtension(
  path: string,
  ext: string,
): string {
  return path.replace(/\.\w+$/, ext);
}

/** Split a path to path + extension */
export function getPathAndExtension(path: string): [string, string] {
  const extension = getExtension(path);
  if (!extension) {
    return [path, ""];
  }
  const pathWithoutExtension = path.slice(0, -extension.length);
  return [pathWithoutExtension, extension];
}

/** Get the extension of a path (this works better than std/path) */
export function getExtension(path: string): string {
  const match = path.match(/\.\w+$/);
  return match ? match[0].toLowerCase() : "";
}

export type Extensions = string[] | "*";

export function matchExtension(exts: Extensions, path: string): boolean {
  if (exts === "*") {
    return true;
  }

  return exts.some((ext) => path.endsWith(ext));
}

/**
 * Resolve the path of an included file
 * Used in the template engines and processors
 */
export function resolveInclude(
  path: string,
  includesDir: string,
  fromDir?: string,
  rootToRemove?: string,
): string {
  if (isUrl(path)) {
    return path;
  }

  if (path.startsWith(".")) {
    if (!fromDir) {
      throw new Error(`Cannot load "${path}" without a base directory`);
    }

    return normalizePath(posix.join(fromDir, path), rootToRemove);
  }

  const normalized = normalizePath(path, rootToRemove);

  return normalized.startsWith(normalizePath(posix.join(includesDir, "/")))
    ? normalized
    : normalizePath(posix.join(includesDir, normalized));
}

/**
 * decodeURI() can't decode the `%` character, as it is used in any encoded character
 * @author [Why does decodeURIComponent('%') lock up my browser?](https://stackoverflow.com/a/54310080/3416774)
 */
export function decodeURIComponentSafe(path: string): string {
  return decodeURIComponent(path.replace(/%(?![0-9a-fA-F]+)/g, "%25"));
}