// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: 2024 A-La-Karte Contributors

#include "gamepadmanager.h"

#if defined(ALAKARTE_HAVE_QT_GAMEPAD)

#include <QGamepad>
#include <QGamepadManager>

GamepadManager *GamepadManager::s_instance = nullptr;

GamepadManager::GamepadManager(QObject *parent)
    : QObject(parent)
{
    auto *manager = QGamepadManager::instance();

    connect(manager, &QGamepadManager::gamepadConnected, this, &GamepadManager::onGamepadConnected);
    connect(manager, &QGamepadManager::gamepadDisconnected, this, &GamepadManager::onGamepadDisconnected);

    m_repeatTimer.setInterval(150);
    connect(&m_repeatTimer, &QTimer::timeout, this, &GamepadManager::processInput);

    const auto gamepads = manager->connectedGamepads();
    if (!gamepads.isEmpty()) {
        setupGamepad(gamepads.first());
    }
}

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

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

bool GamepadManager::connected() const
{
    return m_connected;
}

bool GamepadManager::active() const
{
    return m_active;
}

void GamepadManager::setActive(bool active)
{
    if (m_active != active) {
        m_active = active;
        Q_EMIT activeChanged();
    }
}

void GamepadManager::onGamepadConnected(int deviceId)
{
    if (!m_gamepad) {
        setupGamepad(deviceId);
    }
}

void GamepadManager::onGamepadDisconnected(int deviceId)
{
    if (m_gamepad && m_gamepad->deviceId() == deviceId) {
        m_gamepad->deleteLater();
        m_gamepad = nullptr;
        m_connected = false;
        m_repeatTimer.stop();
        Q_EMIT connectedChanged();

        const auto gamepads = QGamepadManager::instance()->connectedGamepads();
        if (!gamepads.isEmpty()) {
            setupGamepad(gamepads.first());
        }
    }
}

void GamepadManager::setupGamepad(int deviceId)
{
    m_gamepad = new QGamepad(deviceId, this);
    m_connected = true;
    Q_EMIT connectedChanged();

    connect(m_gamepad, &QGamepad::axisLeftYChanged, this, [this](double value) {
        if (qAbs(value) > 0.5) {
            setActive(true);
            if (value < -0.5) {
                Q_EMIT navigateUp();
            } else {
                Q_EMIT navigateDown();
            }
            m_repeatTimer.start();
        } else {
            m_repeatTimer.stop();
        }
    });

    connect(m_gamepad, &QGamepad::axisLeftXChanged, this, [this](double value) {
        if (qAbs(value) > 0.5) {
            setActive(true);
            if (value < -0.5) {
                Q_EMIT navigateLeft();
            } else {
                Q_EMIT navigateRight();
            }
            m_repeatTimer.start();
        } else {
            m_repeatTimer.stop();
        }
    });

    connect(m_gamepad, &QGamepad::buttonAChanged, this, [this](bool pressed) {
        if (pressed) {
            setActive(true);
            Q_EMIT selectPressed();
        }
    });

    connect(m_gamepad, &QGamepad::buttonBChanged, this, [this](bool pressed) {
        if (pressed) {
            setActive(true);
            Q_EMIT backPressed();
        }
    });

    connect(m_gamepad, &QGamepad::buttonStartChanged, this, [this](bool pressed) {
        if (pressed) {
            setActive(true);
            Q_EMIT menuPressed();
        }
    });

    connect(m_gamepad, &QGamepad::buttonYChanged, this, [this](bool pressed) {
        if (pressed) {
            setActive(true);
            Q_EMIT searchPressed();
        }
    });

    connect(m_gamepad, &QGamepad::buttonUpChanged, this, [this](bool pressed) {
        if (pressed) {
            setActive(true);
            Q_EMIT navigateUp();
        }
    });

    connect(m_gamepad, &QGamepad::buttonDownChanged, this, [this](bool pressed) {
        if (pressed) {
            setActive(true);
            Q_EMIT navigateDown();
        }
    });

    connect(m_gamepad, &QGamepad::buttonLeftChanged, this, [this](bool pressed) {
        if (pressed) {
            setActive(true);
            Q_EMIT navigateLeft();
        }
    });

    connect(m_gamepad, &QGamepad::buttonRightChanged, this, [this](bool pressed) {
        if (pressed) {
            setActive(true);
            Q_EMIT navigateRight();
        }
    });
}

void GamepadManager::processInput()
{
    if (!m_gamepad)
        return;

    double y = m_gamepad->axisLeftY();
    double x = m_gamepad->axisLeftX();

    if (y < -0.5) {
        Q_EMIT navigateUp();
    } else if (y > 0.5) {
        Q_EMIT navigateDown();
    }

    if (x < -0.5) {
        Q_EMIT navigateLeft();
    } else if (x > 0.5) {
        Q_EMIT navigateRight();
    }
}

#else

GamepadManager *GamepadManager::s_instance = nullptr;

GamepadManager::GamepadManager(QObject *parent)
    : QObject(parent)
{
}

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

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

bool GamepadManager::connected() const
{
    return false;
}

bool GamepadManager::active() const
{
    return false;
}

#endif