// SPDX-License-Identifier: GPL-3.0-or-later

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
*
* Copyright (C) 2013 - 2024, nymea GmbH
* Copyright (C) 2024 - 2025, chargebyte austria GmbH
*
* This file is part of nymea-gpio.
*
* nymea-gpio 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.
*
* nymea-gpio 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 nymea-gpio. If not, see <https://www.gnu.org/licenses/>.
*
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#include <QCommandLineParser>

#include "application.h"
#include "gpiomonitor.h"

int main(int argc, char *argv[])
{
    Application application(argc, argv);
    application.setOrganizationName("nymea GmbH");
    application.setApplicationName("nymea-gpio-tool");
    application.setApplicationVersion(VERSION_STRING);

    QCommandLineParser parser;
    parser.addHelpOption();
    parser.addVersionOption();
    QString applicationDescription = QString("\nnymea-gpio-tool is a command line tool which allows to interact with GPIOs.\n"
                                             "Version: %1\n"
                                             "Copyright (C) 2013 - 2024 nymea GmbH\n"
                                             "Copyright (C) 2024 - 2025 chargebyte austria GmbH\n\n"
                                             "Released under the GNU General Public License v3.0 or (at your option) any later version.\n")
                                         .arg(application.applicationVersion());
    parser.setApplicationDescription(applicationDescription);

    QCommandLineOption gpioOption(QStringList() << "g" << "gpio", "The gpio number to use.", "GPIO");
    parser.addOption(gpioOption);

    QCommandLineOption interruptOption(
        QStringList() << "i" << "interrupt",
        "Configure the input GPIO to the given interrupt. This option is only allowed for monitoring. Allowerd interrupts are: [rising, falling, both, none]. Default is \"both\".",
        "INTERRUPT");
    parser.addOption(interruptOption);

    QCommandLineOption valueOption(QStringList() << "s" << "set-value", "Configure the GPIO to output and set the value. Allowerd values are: [0, 1].", "VALUE");
    parser.addOption(valueOption);

    QCommandLineOption monitorOption(QStringList() << "m" << "monitor",
                                     "Monitor the given GPIO. The GPIO will automatically configured as input and print any change regarding to the given interrupt behaviour.");
    parser.addOption(monitorOption);

    QCommandLineOption activeLowOption(QStringList() << "l" << "active-low", "Configure the pin as active low (default is active high).");
    parser.addOption(activeLowOption);

    parser.process(application);

    // Make sure there is a GPIO number passed
    if (!parser.isSet(gpioOption)) {
        qCritical() << "No GPIO number specified. Please specify a valid GPIO number using -g, --gpio GPIO";
        parser.showHelp(EXIT_FAILURE);
    }

    // Verify GPIO number
    bool gpioNumberOk;
    int gpioNumber = parser.value(gpioOption).toInt(&gpioNumberOk);
    if (!gpioNumberOk || gpioNumber < 0) {
        qCritical() << "Invalid GPIO number" << parser.value(gpioOption) << "passed. The GPIO number has to be a positiv integer.";
        return EXIT_FAILURE;
    }

    // Verify input output operations
    if ((parser.isSet(interruptOption) || parser.isSet(monitorOption)) && parser.isSet(valueOption)) {
        qCritical() << "Invalid parameter combination. The set value can only be used for output GPIO, the monitor and interrupt parameter can only be used for input GPIO.";
        return EXIT_FAILURE;
    }

    Gpio::Edge edge = Gpio::EdgeBoth;
    if (parser.isSet(interruptOption)) {
        if (parser.value(interruptOption).toLower() == "rising") {
            edge = Gpio::EdgeRising;
        } else if (parser.value(interruptOption).toLower() == "falling") {
            edge = Gpio::EdgeFalling;
        } else if (parser.value(interruptOption).toLower() == "none") {
            edge = Gpio::EdgeNone;
        } else if (parser.value(interruptOption).toLower() == "both") {
            edge = Gpio::EdgeBoth;
        } else {
            qCritical() << "Invalid interrupt parameter" << parser.value(interruptOption) << "passed. Valid options are [rising, falling, both, none].";
            return EXIT_FAILURE;
        }
    }

    bool activeLow = parser.isSet(activeLowOption);

    Gpio::Value value = Gpio::ValueInvalid;
    if (parser.isSet(valueOption)) {
        if (parser.value(valueOption) == "1") {
            value = Gpio::ValueHigh;
        } else if (parser.value(valueOption) == "0") {
            value = Gpio::ValueLow;
        } else {
            qCritical() << "Invalid set value parameter" << parser.value(valueOption) << "passed. Valid options are [0, 1].";
            return EXIT_FAILURE;
        }
    }

    if (!Gpio::isAvailable()) {
        qCritical() << "There are no GPIOs available on this platform.";
        return EXIT_FAILURE;
    }

    // Configure the GPIO
    if (parser.isSet(valueOption)) {
        Gpio *gpio = new Gpio(gpioNumber);
        if (!gpio->exportGpio()) {
            qCritical() << "Could not export GPIO" << gpioNumber;
            return EXIT_FAILURE;
        }

        if (!gpio->setDirection(Gpio::DirectionOutput)) {
            qCritical() << "Could not configure GPIO" << gpioNumber << "as output.";
            return EXIT_FAILURE;
        }

        if (parser.isSet(activeLowOption)) {
            if (!gpio->setActiveLow(activeLow)) {
                qCritical() << "Could not set GPIO" << gpioNumber << "to active low" << activeLow;
                return EXIT_FAILURE;
            }
        }

        // Finally set the value
        if (!gpio->setValue(value)) {
            qCritical() << "Could not set GPIO" << gpioNumber << "value to" << value;
            return EXIT_FAILURE;
        }

        delete gpio;
        return EXIT_SUCCESS;
    } else {
        GpioMonitor *monitor = new GpioMonitor(gpioNumber);

        // Inform about interrupt
        QObject::connect(monitor, &GpioMonitor::valueChanged, [gpioNumber](bool value) { qDebug() << "GPIO" << gpioNumber << "value changed:" << (value ? "1" : "0"); });

        // Enable the monitor
        if (!monitor->enable(activeLow, edge)) {
            qCritical() << "Could not enable GPIO" << gpioNumber << "monitor.";
            return EXIT_FAILURE;
        }

        // Clean up the gpio once done
        QObject::connect(&application, &Application::aboutToQuit, [monitor]() { delete monitor; });
    }

    return application.exec();
}