#include "pythonrunner.h"
#include <QDebug>
#include <QDir>
#include <QStandardPaths>
#include <QThread>

PythonRunner::PythonRunner(QTextEdit* outputWidget, QObject* parent)
    : QObject(parent), m_outputWidget(outputWidget), m_process(nullptr), m_venvProcess(nullptr), venvReady(false) {
    m_process = new QProcess(this);
    connect(m_process, &QProcess::readyReadStandardOutput, this, &PythonRunner::onOutputAvailable);
    connect(m_process, &QProcess::readyReadStandardError, this, &PythonRunner::onErrorAvailable);
    connect(m_process, QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished), this, &PythonRunner::onProcessFinished);

    // Start venv setup in background
    QThread::create([this]() { setupVenv(); });
}

PythonRunner::~PythonRunner() {
    if (m_process) {
        m_process->terminate();
        m_process->waitForFinished(1000);
    }
    if (m_venvProcess) {
        m_venvProcess->terminate();
        m_venvProcess->waitForFinished(1000);
    }
}

QString PythonRunner::venvPath() {
    return dir.path() + QDir::separator() + "venv";
}

QString PythonRunner::pythonExePath() {
    QString venv = venvPath();
#ifdef Q_OS_WIN
    return venv + "\\Scripts\\python.exe";
#else
    return venv + "/bin/python";
#endif
}

void PythonRunner::ensureVenvReady() {
    QMutexLocker locker(&venvMutex);
    if (!venvReady) {
        venvCondition.wait(&venvMutex);
    }
}

void PythonRunner::setupVenv() {
    QString venv = venvPath();
    QString pythonCmd = "python3";
#ifdef Q_OS_WIN
    pythonCmd = "python";
#endif

    // Check if venv already exists
    QDir venvDir(venv);
    if (venvDir.exists()) {
        venvReady = true;
        emit venvSetupProgress("Virtual environment already exists");
        return;
    }

    // Create virtual environment
    emit venvSetupProgress("Creating virtual environment...");

    m_venvProcess = new QProcess();
    connect(m_venvProcess, QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished), this, &PythonRunner::onVenvProcessFinished);

    QStringList args;
#ifdef Q_OS_WIN
    args << "-m" << "venv" << "venv";
#else
    args << "-m" << "venv" << venv;
#endif

    m_venvProcess->setWorkingDirectory(dir.path());
    m_venvProcess->start(pythonCmd, args);
    if (!m_venvProcess->waitForStarted()) {
        emit venvSetupProgress("Failed to start venv creation process");
        venvReady = false;
        m_venvProcess->deleteLater();
        m_venvProcess = nullptr;
    }
}

void PythonRunner::onVenvProcessFinished(int exitCode, QProcess::ExitStatus exitStatus) {
    if (exitStatus == QProcess::NormalExit && exitCode == 0) {
        // Install eismultiplexer package
        emit venvSetupProgress("Installing eismultiplexer package...");

        QProcess installProcess;
        installProcess.setWorkingDirectory(dir.path());
        QStringList installArgs;
        installArgs << "-m" << "pip" << "install" << "eismultiplexer";

        installProcess.start(pythonExePath(), installArgs);
        if (!installProcess.waitForFinished(30000)) { // 30 second timeout
            emit venvSetupProgress("Package installation timed out");
            venvReady = false;
        } else {
            QByteArray output = installProcess.readAllStandardOutput();
            QByteArray error = installProcess.readAllStandardError();
            if (!error.isEmpty()) {
                emit venvSetupProgress("Installation error: " + QString::fromLocal8Bit(error));
                venvReady = false;
            } else {
                emit venvSetupProgress("Package installed successfully");
                venvReady = true;
            }
        }
    } else {
        emit venvSetupProgress(QString("Virtual environment creation failed with code %1").arg(exitCode));
        venvReady = false;
    }

    // Clean up
    m_venvProcess->deleteLater();
    m_venvProcess = nullptr;
}

bool PythonRunner::runScript(const QString& scriptContent) {
    if (m_process->state() == QProcess::Running) {
        m_process->terminate();
        m_process->waitForFinished(1000);
    }

    m_outputWidget->clear();

    // Check if venv is ready
    if (!venvReady) {
        m_outputWidget->append("Error: Virtual environment not ready. Please wait for the setup to complete.\n");
        emit scriptFinished(-1);
        return false;
    }

    m_outputWidget->append("Running script in virtual environment...\n");

    QString pythonPath = pythonExePath();
    m_process->start(pythonPath, QStringList() << "-u" << "-c" << scriptContent);

    return true;
}

void PythonRunner::stopScript() {
    if (m_process && m_process->state() == QProcess::Running) {
        m_process->terminate();
    }
}

void PythonRunner::onOutputAvailable() {
    QByteArray output = m_process->readAllStandardOutput();
    m_outputWidget->append(output);
    m_outputWidget->moveCursor(QTextCursor::End);
}

void PythonRunner::onErrorAvailable() {
    QByteArray error = m_process->readAllStandardError();
    m_outputWidget->append(error);
    m_outputWidget->moveCursor(QTextCursor::End);
}

void PythonRunner::onProcessFinished(int exitCode, QProcess::ExitStatus exitStatus) {
    if (exitStatus == QProcess::NormalExit && exitCode != 0) {
        m_outputWidget->append(QString("Process exited with code %1\n").arg(exitCode));
    } else if (exitStatus == QProcess::CrashExit) {
        m_outputWidget->append("Python was stopped\n");
    }
    emit scriptFinished(exitCode);
}

void PythonRunner::onVenvSetupFinished() {
    // This slot can be used to handle venv setup completion if needed
}