#include "infrastructure/runtime_settings_loader.h"
#include "support/test_support.h"

#include <QCoreApplication>
#include <QFile>
#include <QTemporaryDir>

#include <algorithm>
#include <string>

namespace {

using TestSupport::require;

void writeUtf8(const QString &path, const QByteArray &contents)
{
    QFile file(path);
    require(file.open(QIODevice::WriteOnly), "runtime settings file must open");
    require(file.write(contents) == contents.size(),
            "runtime settings file must be written completely");
}

bool containsMessage(
    const RuntimeSettingsLoadResult &result,
    const std::string &fragment)
{
    return std::any_of(
        result.messages.cbegin(), result.messages.cend(),
        [&fragment](const std::string &message)
        {
            return message.find(fragment) != std::string::npos;
        });
}

void testMissingFileCreatesOnlyPlcDefaults()
{
    QTemporaryDir directory;
    require(directory.isValid(), "runtime settings directory must be valid");
    const QString path = directory.filePath("config/runtime.ini");
    const RuntimeSettingsLoadResult result = RuntimeSettingsLoader::load(path);
    require(QFile::exists(path) && !result.warningRequired,
            "missing runtime settings must be created without warning");
    QFile file(path);
    require(file.open(QIODevice::ReadOnly), "created runtime settings must be readable");
    const QByteArray contents = file.readAll();
    require(contents.contains("[PlcDefaults]\n")
                && contents.contains("PortName=COM3\n")
                && !contents.contains("[ProjectLimits]")
                && !contents.contains("[HmiDefaults]")
                && !contents.contains("[Config]"),
            "runtime settings must contain only PLC defaults");
}

void testRuntimeSettingsLoadsSerialFields()
{
    QTemporaryDir directory;
    require(directory.isValid(), "runtime settings directory must be valid");
    const QString path = directory.filePath("runtime.ini");
    writeUtf8(
        path,
        QByteArrayLiteral(
            "[PlcDefaults]\n"
            "PortName=COM7\n"
            "ServerAddress=2\n"
            "BaudRate=19200\n"
            "DataBits=7\n"
            "Parity=3\n"
            "StopBits=2\n"));
    const RuntimeSettingsLoadResult result = RuntimeSettingsLoader::load(path);
    require(!result.warningRequired
                && result.plcDefaults.portName == "COM7"
                && result.plcDefaults.serverAddress == 2
                && result.plcDefaults.baudRate == 19200
                && result.plcDefaults.dataBits == 7
                && result.plcDefaults.parity == 3
                && result.plcDefaults.stopBits == 2,
            "runtime settings must load all six serial fields");
}

void testRuntimeSettingsRejectsInvalidFileAsOneUnit()
{
    QTemporaryDir directory;
    require(directory.isValid(), "runtime settings directory must be valid");
    const QString path = directory.filePath("invalid.ini");
    writeUtf8(
        path,
        QByteArrayLiteral(
            "[PlcDefaults]\n"
            "PortName=COM7\n"
            "ServerAddress=2\n"
            "BaudRate=19200\n"
            "DataBits=8\n"
            "Parity=2\n"
            "StopBits=1\n"
            "[PlcDefaults]\n"
            "PortName=COM8\n"));
    const RuntimeSettingsLoadResult result = RuntimeSettingsLoader::load(path);
    require(result.warningRequired
                && result.plcDefaults.portName == "COM3"
                && containsMessage(result, "重复"),
            "duplicate runtime settings must fall back to code defaults");
}

void testRuntimeSettingsWritesMinimalFile()
{
    QTemporaryDir directory;
    require(directory.isValid(), "runtime settings directory must be valid");
    const QString path = directory.filePath("config/runtime.ini");
    PlcSerialConfiguration configuration;
    configuration.portName = "COM9";
    configuration.serverAddress = 9;
    configuration.baudRate = 38400;
    configuration.dataBits = 8;
    configuration.parity = 0;
    configuration.stopBits = 1;
    std::string error;
    require(RuntimeSettingsLoader::write(path, configuration, &error),
            "runtime settings must write successfully");
    const RuntimeSettingsLoadResult loaded = RuntimeSettingsLoader::load(path);
    require(!loaded.warningRequired
                && loaded.plcDefaults.portName == "COM9"
                && loaded.plcDefaults.serverAddress == 9
                && loaded.plcDefaults.baudRate == 38400
                && loaded.plcDefaults.parity == 0,
            "written runtime settings must round trip");
}

} // namespace

int main(int argc, char *argv[])
{
    QCoreApplication application(argc, argv);
    return TestSupport::runTestSuite("runtime settings tests", {
        {"testMissingFileCreatesOnlyPlcDefaults", testMissingFileCreatesOnlyPlcDefaults},
        {"testRuntimeSettingsLoadsSerialFields", testRuntimeSettingsLoadsSerialFields},
        {"testRuntimeSettingsRejectsInvalidFileAsOneUnit", testRuntimeSettingsRejectsInvalidFileAsOneUnit},
        {"testRuntimeSettingsWritesMinimalFile", testRuntimeSettingsWritesMinimalFile},
    });
}