// Copyright 2019-2023 Tauri Programme within The Commons Conservancy
// SPDX-License-Identifier: Apache-2.0
// SPDX-License-Identifier: MIT

/**
 * Provides operating system-related utility methods and properties.
 *
 * @module
 */

declare global {
  interface Window {
    __TAURI_INVOKE__: <T>(cmd: string, args?: unknown) => Promise<T>;
  }
}

type Platform =
  | "linux"
  | "darwin"
  | "ios"
  | "freebsd"
  | "dragonfly"
  | "netbsd"
  | "openbsd"
  | "solaris"
  | "android"
  | "win32";

type OsType = "Linux" | "Darwin" | "Windows_NT";

type Arch =
  | "x86"
  | "x86_64"
  | "arm"
  | "aarch64"
  | "mips"
  | "mips64"
  | "powerpc"
  | "powerpc64"
  | "riscv64"
  | "s390x"
  | "sparc64";

function isWindows(): boolean {
  return navigator.appVersion.includes("Win");
}

/**
 * The operating system-specific end-of-line marker.
 * - `\n` on POSIX
 * - `\r\n` on Windows
 *
 * @since 2.0.0
 * */
const EOL = isWindows() ? "\r\n" : "\n";

/**
 * Returns a string identifying the operating system platform.
 * The value is set at compile time. Possible values are `'linux'`, `'darwin'`, `'ios'`, `'freebsd'`, `'dragonfly'`, `'netbsd'`, `'openbsd'`, `'solaris'`, `'android'`, `'win32'`
 * @example
 * ```typescript
 * import { platform } from '@tauri-apps/plugin-os';
 * const platformName = await platform();
 * ```
 *
 * @since 2.0.0
 *
 */
async function platform(): Promise<Platform> {
  return window.__TAURI_INVOKE__("plugin:os|platform");
}

/**
 * Returns a string identifying the kernel version.
 * @example
 * ```typescript
 * import { version } from '@tauri-apps/plugin-os';
 * const osVersion = await version();
 * ```
 *
 * @since 2.0.0
 */
async function version(): Promise<string> {
  return window.__TAURI_INVOKE__("plugin:os|version");
}

/**
 * Returns `'Linux'` on Linux, `'Darwin'` on macOS, and `'Windows_NT'` on Windows.
 * @example
 * ```typescript
 * import { type } from '@tauri-apps/plugin-os';
 * const osType = await type();
 * ```
 *
 * @since 2.0.0
 */
async function type(): Promise<OsType> {
  return window.__TAURI_INVOKE__("plugin:os|kind");
}

/**
 * Returns the operating system CPU architecture for which the tauri app was compiled.
 * Possible values are `'x86'`, `'x86_64'`, `'arm'`, `'aarch64'`, `'mips'`, `'mips64'`, `'powerpc'`, `'powerpc64'`, `'riscv64'`, `'s390x'`, `'sparc64'`.
 * @example
 * ```typescript
 * import { arch } from '@tauri-apps/plugin-os';
 * const archName = await arch();
 * ```
 *
 * @since 2.0.0
 */
async function arch(): Promise<Arch> {
  return window.__TAURI_INVOKE__("plugin:os|arch");
}

/**
 * Returns the operating system's default directory for temporary files as a string.
 * @example
 * ```typescript
 * import { tempdir } from '@tauri-apps/plugin-os';
 * const tempdirPath = await tempdir();
 * ```
 *
 * @since 2.0.0
 */
async function tempdir(): Promise<string> {
  return window.__TAURI_INVOKE__("plugin:os|tempdir");
}

/**
 * Returns a String with a `BCP-47` language tag inside. If the locale couldn’t be obtained, `null` is returned instead.
 * @example
 * ```typescript
 * import { locale } from '@tauri-apps/plugin-os';
 * const locale = await locale();
 * if (locale) {
 *    // use the locale string here
 * }
 * ```
 *
 * @since 2.0.0
 */
async function locale(): Promise<string | null> {
  return window.__TAURI_INVOKE__("plugin:os|locale");
}

export { EOL, platform, version, type, arch, tempdir, locale };
export type { Platform, OsType, Arch };