/*
 * This file is part of espanso.
 *
 * Copyright (C) 2019-2021 Federico Terzi
 *
 * espanso is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * espanso is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with espanso.  If not, see <https://www.gnu.org/licenses/>.
 */

#ifndef ESPANSO_DETECT_H
#define ESPANSO_DETECT_H

#include <stdint.h>

#define INPUT_EVENT_TYPE_KEYBOARD 1
#define INPUT_EVENT_TYPE_MOUSE 2
#define INPUT_EVENT_TYPE_HOTKEY 3

#define INPUT_STATUS_PRESSED 1
#define INPUT_STATUS_RELEASED 2

#define INPUT_LEFT_VARIANT 1
#define INPUT_RIGHT_VARIANT 2

#define INPUT_MOUSE_LEFT_BUTTON 1
#define INPUT_MOUSE_RIGHT_BUTTON 2
#define INPUT_MOUSE_MIDDLE_BUTTON 3
#define INPUT_MOUSE_BUTTON_1 4
#define INPUT_MOUSE_BUTTON_2 5
#define INPUT_MOUSE_BUTTON_3 6
#define INPUT_MOUSE_BUTTON_4 7
#define INPUT_MOUSE_BUTTON_5 8

typedef struct {
    // Keyboard, Mouse or Hotkey event
    int32_t event_type;

    // Contains the string corresponding to the key, if any
    uint16_t buffer[24];
    // Length of the extracted string. Equals 0 if no string is extracted
    int32_t buffer_len;

    // Virtual key code of the pressed key in case of keyboard events
    // Mouse button code for mouse events.
    // Hotkey id for hotkey events
    int32_t key_code;

    // Left or Right variant
    int32_t variant;

    // Pressed or Released status
    int32_t status;

    // Only relevant for keyboard events, this is set to 1
    // if a keyboard event has an explicit source, 0 otherwise.
    // This is needed to filter out software generated events,
    // including those from espanso.
    int32_t has_known_source;
} InputEvent;

typedef struct {
    int32_t hk_id;
    uint32_t key_code;
    uint32_t flags;
} HotKey;

typedef void (*EventCallback)(void *rust_istance, InputEvent data);

typedef struct {
    long keyboard_layout_cache_interval;
} InitOptions;

// Initialize the Raw Input API and the Window.
extern "C" void *detect_initialize(void *rust_istance, InitOptions *options,
                                   int32_t *error_code);

// Register the given hotkey, return a non-zero code if successful
extern "C" int32_t detect_register_hotkey(void *window, HotKey hotkey);

// Run the event loop. Blocking call.
extern "C" int32_t detect_eventloop(void *window, EventCallback callback);

// Destroy the given window.
extern "C" int32_t detect_destroy(void *window);

#endif // ESPANSO_DETECT_H