/**
 * Input event structural enum
 * 
 * Created on 2020/01/05.
 */

#ifndef LIQUID_INPUT_EVENT_H
#define LIQUID_INPUT_EVENT_H

#include <stdint.h>

enum InputEvent_Kind {
    InputEventKind_Wheel,
    InputEventKind_Button,
};

struct InputEvent {
    enum InputEvent_Kind kind;
    union {
        struct {
            // Wheel delta
            int32_t delta;
            int8_t direction;
        } wheel;
        struct {
            // Button state
            bool state;
        } button;
    };
};

static inline struct InputEvent InputEvent_Wheel(int32_t delta)
{
    return (struct InputEvent) {
        .kind = InputEventKind_Wheel,
        .wheel = {
            .delta = delta,
            .direction = delta > 0 ? 1 : -1,
        }
    };
}

/**
 * Button event (push, release)
 *
 * @param state - pushed
 * @return event
 */
static inline struct InputEvent InputEvent_Button(bool state)
{
    return (struct InputEvent) {
        .kind = InputEventKind_Button,
        .button = {.state = state},
    };
}

#endif //LIQUID_INPUT_EVENT_H