// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: 2026 A-La-Karte Contributors

#include "inputmanager.h"

#include "gamepadmanager.h"

#include <QCoreApplication>
#include <QEvent>
#include <QGuiApplication>

InputManager *InputManager::s_instance = nullptr;

InputManager::InputManager(QObject *parent)
    : QObject(parent)
{
    if (QCoreApplication::instance()) {
        QCoreApplication::instance()->installEventFilter(this);
    }

    auto *pad = GamepadManager::instance();
    connect(pad, &GamepadManager::activeChanged, this, [this, pad]() {
        if (pad->active()) {
            if (!m_hasSeenGamepad) {
                m_hasSeenGamepad = true;
                Q_EMIT inputHistoryChanged();
            }
            setActiveInput(Gamepad);
        }
    });

    connect(pad, &GamepadManager::connectedChanged, this, [this, pad]() {
        if (!pad->connected() && m_activeInput == Gamepad) {
            setActiveInput(KeyboardMouse);
        }
    });
}

InputManager *InputManager::instance()
{
    if (!s_instance) {
        s_instance = new InputManager();
    }
    return s_instance;
}

InputManager *InputManager::create(QQmlEngine *engine, QJSEngine *scriptEngine)
{
    Q_UNUSED(engine)
    Q_UNUSED(scriptEngine)
    return instance();
}

InputManager::ActiveInput InputManager::activeInput() const
{
    return m_activeInput;
}

bool InputManager::hasSeenKeyboardMouse() const
{
    return m_hasSeenKeyboardMouse;
}

bool InputManager::hasSeenGamepad() const
{
    return m_hasSeenGamepad;
}

void InputManager::setActiveInput(ActiveInput input)
{
    if (m_activeInput == input) {
        return;
    }

    m_activeInput = input;
    Q_EMIT activeInputChanged();
}

bool InputManager::eventFilter(QObject *watched, QEvent *event)
{
    Q_UNUSED(watched)

    if (!event) {
        return false;
    }

    switch (event->type()) {
    case QEvent::KeyPress:
    case QEvent::KeyRelease:
    case QEvent::MouseButtonPress:
    case QEvent::MouseButtonRelease:
    case QEvent::Wheel:
        if (!m_hasSeenKeyboardMouse) {
            m_hasSeenKeyboardMouse = true;
            Q_EMIT inputHistoryChanged();
        }
        setActiveInput(KeyboardMouse);
        break;
    default:
        break;
    }

    return false;
}