//! Raw FFI bindings to tauri UI.

#[macro_use]
extern crate bitflags;

use std::os::raw::*;

// https://doc.rust-lang.org/nomicon/ffi.html#representing-opaque-structs
#[repr(C)]
pub struct CWebView {
  _private: [u8; 0],
}

type ErasedExternalInvokeFn = extern "C" fn(webview: *mut CWebView, arg: *const c_char);
type ErasedDispatchFn = extern "C" fn(webview: *mut CWebView, arg: *mut c_void);

#[repr(C)]
pub enum DialogType {
  Open = 0,
  Save = 1,
  Alert = 2,
}

bitflags! {
  #[repr(C)]
  pub struct DialogFlags: u32 {
    const FILE      = 0b0000;
    const DIRECTORY = 0b0001;
    const INFO      = 0b0010;
    const WARNING   = 0b0100;
    const ERROR     = 0b0110;
  }
}

extern "C" {
  pub fn wrapper_webview_free(this: *mut CWebView);
  pub fn wrapper_webview_new(
    title: *const c_char,
    url: *const c_char,
    width: c_int,
    height: c_int,
    resizable: c_int,
    debug: c_int,
    external_invoke_cb: Option<ErasedExternalInvokeFn>,
    userdata: *mut c_void,
  ) -> *mut CWebView;
  pub fn webview_loop(this: *mut CWebView, blocking: c_int) -> c_int;
  pub fn webview_terminate(this: *mut CWebView);
  pub fn webview_exit(this: *mut CWebView);
  pub fn wrapper_webview_get_userdata(this: *mut CWebView) -> *mut c_void;
  pub fn webview_dispatch(this: *mut CWebView, f: Option<ErasedDispatchFn>, arg: *mut c_void);
  pub fn webview_eval(this: *mut CWebView, js: *const c_char) -> c_int;
  pub fn webview_inject_css(this: *mut CWebView, css: *const c_char) -> c_int;
  pub fn webview_set_title(this: *mut CWebView, title: *const c_char);
  pub fn webview_set_fullscreen(this: *mut CWebView, fullscreen: c_int);
  pub fn webview_set_color(this: *mut CWebView, red: u8, green: u8, blue: u8, alpha: u8);
  pub fn webview_dialog(
    this: *mut CWebView,
    dialog_type: DialogType,
    flags: DialogFlags,
    title: *const c_char,
    arg: *const c_char,
    result: *mut c_char,
    result_size: usize,
  );
}