/*
 * Copyright (C) 2020-2022 Roy Qu (royqh1979@gmail.com)
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#include "compilermanager.h"
#include "filecompiler.h"
#include "stdincompiler.h"
#include "../mainwindow.h"
#include "executablerunner.h"
#include "ojproblemcasesrunner.h"
#include "utils.h"
#include "../settings.h"
#include <QMessageBox>
#include "projectcompiler.h"
#include "../platform.h"

enum RunProgramFlag {
    RPF_PAUSE_CONSOLE =     0x0001,
    RPF_REDIRECT_INPUT =    0x0002
};

CompilerManager::CompilerManager(QObject *parent) : QObject(parent),
    mCompileMutex(QMutex::Recursive),
    mBackgroundSyntaxCheckMutex(QMutex::Recursive),
    mRunnerMutex(QMutex::Recursive)

{
    mCompiler = nullptr;
    mBackgroundSyntaxChecker = nullptr;
    mRunner = nullptr;
    mSyntaxCheckErrorCount = 0;
    mSyntaxCheckIssueCount = 0;
    mCompileErrorCount = 0;
    mCompileIssueCount = 0;
    mSyntaxCheckErrorCount = 0;
}

bool CompilerManager::compiling()
{
    QMutexLocker locker(&mCompileMutex);
    return mCompiler!=nullptr;
}

bool CompilerManager::backgroundSyntaxChecking()
{
    QMutexLocker locker(&mBackgroundSyntaxCheckMutex);
    return mBackgroundSyntaxChecker!=nullptr;
}

bool CompilerManager::running()
{
    QMutexLocker locker(&mRunnerMutex);
    return (mRunner!=nullptr && !mRunner->pausing());
}

void CompilerManager::compile(const QString& filename, const QByteArray& encoding, bool rebuild, bool silent, bool onlyCheckSyntax)
{
    if (!pSettings->compilerSets().defaultSet()) {
        QMessageBox::critical(pMainWindow,
                              tr("No compiler set"),
                              tr("No compiler set is configured.")+tr("Can't start debugging."));
        return;
    }
    if (pSettings->compilerSets().defaultSet()->compilerType() == "Clang"
            && (
                (encoding!= ENCODING_ASCII && encoding!=ENCODING_UTF8)
                || (encoding == ENCODING_UTF8
                    && pCharsetInfoManager->getDefaultSystemEncoding()!=ENCODING_UTF8)
            )) {
        QMessageBox::information(pMainWindow,
                              tr("Encoding not support"),
                              tr("Clang only support utf-8 encoding.")
                                 +"<br />"
                                 +tr("Strings in the program might be wrongly processed."));
    }
    {
        QMutexLocker locker(&mCompileMutex);
        if (mCompiler!=nullptr) {
            return;
        }
        mCompileErrorCount = 0;
        mCompileIssueCount = 0;
        mCompiler = new FileCompiler(filename,encoding,silent,onlyCheckSyntax);
        mCompiler->setRebuild(rebuild);
        connect(mCompiler, &Compiler::finished, mCompiler, &QObject::deleteLater);
        connect(mCompiler, &Compiler::compileFinished, this, &CompilerManager::onCompileFinished);
        connect(mCompiler, &Compiler::compileIssue, this, &CompilerManager::onCompileIssue);
        connect(mCompiler, &Compiler::compileStarted, pMainWindow, &MainWindow::onCompileStarted);

        connect(mCompiler, &Compiler::compileOutput, pMainWindow, &MainWindow::onCompileLog);
        connect(mCompiler, &Compiler::compileIssue, pMainWindow, &MainWindow::onCompileIssue);
        connect(mCompiler, &Compiler::compileErrorOccured, pMainWindow, &MainWindow::onCompileErrorOccured);
        mCompiler->start();
    }
}

void CompilerManager::compileProject(std::shared_ptr<Project> project, bool rebuild, bool silent,bool onlyCheckSyntax)
{
    if (!pSettings->compilerSets().defaultSet()) {
        QMessageBox::critical(pMainWindow,
                              tr("No compiler set"),
                              tr("No compiler set is configured.")+tr("Can't start debugging."));
        return;
    }
    {
        QMutexLocker locker(&mCompileMutex);
        if (mCompiler!=nullptr) {
            return;
        }
        mCompileErrorCount = 0;
        mCompileIssueCount = 0;
        mCompiler = new ProjectCompiler(project,silent,onlyCheckSyntax);
        mCompiler->setRebuild(rebuild);
        connect(mCompiler, &Compiler::finished, mCompiler, &QObject::deleteLater);
        connect(mCompiler, &Compiler::compileFinished, this, &CompilerManager::onCompileFinished);

        connect(mCompiler, &Compiler::compileIssue, this, &CompilerManager::onCompileIssue);
        connect(mCompiler, &Compiler::compileStarted, pMainWindow, &MainWindow::onCompileStarted);

        connect(mCompiler, &Compiler::compileOutput, pMainWindow, &MainWindow::onCompileLog);
        connect(mCompiler, &Compiler::compileIssue, pMainWindow, &MainWindow::onCompileIssue);
        connect(mCompiler, &Compiler::compileErrorOccured, pMainWindow, &MainWindow::onCompileErrorOccured);
        mCompiler->start();
    }
}

void CompilerManager::cleanProject(std::shared_ptr<Project> project)
{
    if (!pSettings->compilerSets().defaultSet()) {
        QMessageBox::critical(pMainWindow,
                              tr("No compiler set"),
                              tr("No compiler set is configured.")+tr("Can't start debugging."));
        return;
    }
    {
        QMutexLocker locker(&mCompileMutex);
        if (mCompiler!=nullptr) {
            return;
        }
        mCompileErrorCount = 0;
        mCompileIssueCount = 0;
        ProjectCompiler* compiler = new ProjectCompiler(project,false,false);
        compiler->setOnlyClean(true);
        mCompiler = compiler;
        mCompiler->setRebuild(false);
        connect(mCompiler, &Compiler::finished, mCompiler, &QObject::deleteLater);
        connect(mCompiler, &Compiler::compileFinished, this, &CompilerManager::onCompileFinished);

        connect(mCompiler, &Compiler::compileIssue, this, &CompilerManager::onCompileIssue);
        connect(mCompiler, &Compiler::compileStarted, pMainWindow, &MainWindow::onCompileStarted);

        connect(mCompiler, &Compiler::compileOutput, pMainWindow, &MainWindow::onCompileLog);
        connect(mCompiler, &Compiler::compileIssue, pMainWindow, &MainWindow::onCompileIssue);
        connect(mCompiler, &Compiler::compileErrorOccured, pMainWindow, &MainWindow::onCompileErrorOccured);
        mCompiler->start();
    }
}

void CompilerManager::buildProjectMakefile(std::shared_ptr<Project> project)
{
    if (!pSettings->compilerSets().defaultSet()) {
        QMessageBox::critical(pMainWindow,
                              tr("No compiler set"),
                              tr("No compiler set is configured.")+tr("Can't start debugging."));
        return;
    }
    {
        QMutexLocker locker(&mCompileMutex);
        if (mCompiler!=nullptr) {
            return;
        }
        ProjectCompiler compiler(project,false,false);
        compiler.buildMakeFile();
    }

}

void CompilerManager::checkSyntax(const QString &filename, const QString &content, bool isAscii, std::shared_ptr<Project> project)
{
    if (!pSettings->compilerSets().defaultSet()) {
        QMessageBox::critical(pMainWindow,
                              tr("No compiler set"),
                              tr("No compiler set is configured.")+tr("Can't start debugging."));
        return;
    }
    {
        QMutexLocker locker(&mBackgroundSyntaxCheckMutex);
        if (mBackgroundSyntaxChecker!=nullptr) {
            return;
        }

        mSyntaxCheckErrorCount = 0;
        mSyntaxCheckIssueCount = 0;
        mBackgroundSyntaxChecker = new StdinCompiler(filename,content,isAscii,true,true);
        mBackgroundSyntaxChecker->setProject(project);
        connect(mBackgroundSyntaxChecker, &Compiler::finished, mBackgroundSyntaxChecker, &QThread::deleteLater);
        connect(mBackgroundSyntaxChecker, &Compiler::compileIssue, this, &CompilerManager::onSyntaxCheckIssue);
        connect(mBackgroundSyntaxChecker, &Compiler::compileStarted, pMainWindow, &MainWindow::onCompileStarted);
        connect(mBackgroundSyntaxChecker, &Compiler::compileFinished, this, &CompilerManager::onSyntaxCheckFinished);
        connect(mBackgroundSyntaxChecker, &Compiler::compileOutput, pMainWindow, &MainWindow::onCompileLog);
        connect(mBackgroundSyntaxChecker, &Compiler::compileIssue, pMainWindow, &MainWindow::onCompileIssue);
        connect(mBackgroundSyntaxChecker, &Compiler::compileErrorOccured, pMainWindow, &MainWindow::onCompileErrorOccured);
        mBackgroundSyntaxChecker->start();
    }
}

void CompilerManager::run(const QString &filename, const QString &arguments, const QString &workDir)
{
    QMutexLocker locker(&mRunnerMutex);
    if (mRunner!=nullptr && !mRunner->pausing()) {
        return;
    }
    QString redirectInputFilename;
    bool redirectInput=false;
    if (pSettings->executor().redirectInput()
            && !pSettings->executor().inputFilename().isEmpty()) {
        redirectInput =true;
        redirectInputFilename = pSettings->executor().inputFilename();
    }
    ExecutableRunner * execRunner;
    if (programHasConsole(filename)) {
        int consoleFlag=0;
        if (redirectInput)
            consoleFlag |= RPF_REDIRECT_INPUT;
        if (pSettings->executor().pauseConsole())
            consoleFlag |= RPF_PAUSE_CONSOLE;
#ifdef Q_OS_WIN
        if (consoleFlag!=0) {
            QString newArguments = QString(" %1 \"%2\" %3")
                    .arg(consoleFlag)
                    .arg(localizePath(filename)).arg(arguments);
            execRunner = new ExecutableRunner(includeTrailingPathDelimiter(pSettings->dirs().appDir())+"ConsolePauser.exe",newArguments,workDir);
        } else {
            execRunner = new ExecutableRunner(filename,arguments,workDir);
        }
#else
        QString newArguments;
        if (consoleFlag!=0) {
            QString consolePauserPath=includeTrailingPathDelimiter(pSettings->dirs().appLibexecDir())+"consolepauser";
            if (!fileExists(consolePauserPath)) {
                QMessageBox::critical(pMainWindow,
                                         tr("Can't find Console Pauser"),
                                         tr("Console Pauser \"%1\" doesn't exists!")
                                         .arg(consolePauserPath));
                return;

            }
            if (redirectInput) {
                newArguments = QString(" -e \"%1\" %2 \"%3\" \"%4\" %5")
                        .arg(consolePauserPath)
                        .arg(consoleFlag)
                        .arg(redirectInputFilename)
                        .arg(localizePath(filename))
                        .arg(arguments);
            } else {
                newArguments = QString(" -e \"%1\" %2 \"%3\" %4")
                    .arg(consolePauserPath)
                    .arg(consoleFlag)
                    .arg(localizePath(filename)).arg(arguments);
            }
        } else {
            newArguments = QString(" -e \"%1\" %2")
                .arg(localizePath(filename)).arg(arguments);
        }
        execRunner = new ExecutableRunner(pSettings->environment().terminalPath(),newArguments,workDir);
#endif
        execRunner->setStartConsole(true);
    } else {
        execRunner = new ExecutableRunner(filename,arguments,workDir);
    }    
    if (redirectInput) {
        execRunner->setRedirectInput(true);
        execRunner->setRedirectInputFilename(redirectInputFilename);
    }
    mRunner = execRunner;
    connect(mRunner, &Runner::finished, this ,&CompilerManager::onRunnerTerminated);
    connect(mRunner, &Runner::finished, mRunner ,&Runner::deleteLater);
    connect(mRunner, &Runner::finished, pMainWindow ,&MainWindow::onRunFinished);
    connect(mRunner, &Runner::pausingForFinish, pMainWindow ,&MainWindow::onRunPausingForFinish);
    connect(mRunner, &Runner::pausingForFinish, this ,&CompilerManager::onRunnerPausing);
    connect(mRunner, &Runner::runErrorOccurred, pMainWindow ,&MainWindow::onRunErrorOccured);
    mRunner->start();
}

void CompilerManager::runProblem(const QString &filename, const QString &arguments, const QString &workDir, POJProblemCase problemCase)
{
    QMutexLocker locker(&mRunnerMutex);
    if (mRunner!=nullptr) {
        return;
    }

    OJProblemCasesRunner * execRunner = new OJProblemCasesRunner(filename,arguments,workDir,problemCase);
    mRunner = execRunner;
    connect(mRunner, &Runner::finished, this ,&CompilerManager::onRunnerTerminated);
    connect(mRunner, &Runner::finished, mRunner ,&Runner::deleteLater);
    connect(mRunner, &Runner::finished, pMainWindow ,&MainWindow::onRunProblemFinished);
    connect(mRunner, &Runner::runErrorOccurred, pMainWindow ,&MainWindow::onRunErrorOccured);
    connect(execRunner, &OJProblemCasesRunner::caseStarted, pMainWindow, &MainWindow::onOJProblemCaseStarted);
    connect(execRunner, &OJProblemCasesRunner::caseFinished, pMainWindow, &MainWindow::onOJProblemCaseFinished);
    mRunner->start();
}

void CompilerManager::runProblem(const QString &filename, const QString &arguments, const QString &workDir, QVector<POJProblemCase> problemCases)
{
    QMutexLocker locker(&mRunnerMutex);
    if (mRunner!=nullptr) {
        return;
    }
    OJProblemCasesRunner * execRunner = new OJProblemCasesRunner(filename,arguments,workDir,problemCases);
    mRunner = execRunner;
    connect(mRunner, &Runner::finished, this ,&CompilerManager::onRunnerTerminated);
    connect(mRunner, &Runner::finished, pMainWindow ,&MainWindow::onRunProblemFinished);
    connect(mRunner, &Runner::runErrorOccurred, pMainWindow ,&MainWindow::onRunErrorOccured);
    connect(execRunner, &OJProblemCasesRunner::caseStarted, pMainWindow, &MainWindow::onOJProblemCaseStarted);
    connect(execRunner, &OJProblemCasesRunner::caseFinished, pMainWindow, &MainWindow::onOJProblemCaseFinished);
    connect(execRunner, &OJProblemCasesRunner::newOutputGetted, pMainWindow, &MainWindow::onOJProblemCaseNewOutputGetted);
    mRunner->start();
}

void CompilerManager::stopRun()
{
    QMutexLocker locker(&mRunnerMutex);
    if (mRunner!=nullptr) {
        mRunner->stop();
        disconnect(mRunner, &Runner::finished, this ,&CompilerManager::onRunnerTerminated);
        mRunner=nullptr;
    }
}

void CompilerManager::stopAllRunners()
{
    emit signalStopAllRunners();
}

void CompilerManager::stopPausing()
{
    QMutexLocker locker(&mRunnerMutex);
    if (mRunner!=nullptr && mRunner->pausing()) {
        disconnect(mRunner, &Runner::finished, this ,&CompilerManager::onRunnerTerminated);
        mRunner->stop();
        mRunner=nullptr;
    }
}

void CompilerManager::stopCompile()
{
    QMutexLocker locker(&mCompileMutex);
    if (mCompiler!=nullptr)
        mCompiler->stopCompile();
}

void CompilerManager::stopCheckSyntax()
{
    QMutexLocker locker(&mBackgroundSyntaxCheckMutex);
    if (mBackgroundSyntaxChecker!=nullptr)
        mBackgroundSyntaxChecker->stopCompile();
}

bool CompilerManager::canCompile(const QString &)
{
    return !compiling();
}

void CompilerManager::onCompileFinished()
{
    QMutexLocker locker(&mCompileMutex);
    mCompiler=nullptr;
    pMainWindow->onCompileFinished(false);
}

void CompilerManager::onRunnerTerminated()
{
    QMutexLocker locker(&mRunnerMutex);
    mRunner=nullptr;
}

void CompilerManager::onRunnerPausing()
{
    QMutexLocker locker(&mRunnerMutex);
    disconnect(mRunner, &Runner::finished, this ,&CompilerManager::onRunnerTerminated);
    disconnect(mRunner, &Runner::finished, pMainWindow ,&MainWindow::onRunFinished);
    disconnect(mRunner, &Runner::runErrorOccurred, pMainWindow ,&MainWindow::onRunErrorOccured);
    connect(this, &CompilerManager::signalStopAllRunners, mRunner, &Runner::stop);
    mRunner=nullptr;
}

void CompilerManager::onCompileIssue(PCompileIssue issue)
{
    if (issue->type == CompileIssueType::Error)
        mCompileErrorCount++;
    mCompileIssueCount++;
}

void CompilerManager::onSyntaxCheckFinished()
{
    QMutexLocker locker(&mBackgroundSyntaxCheckMutex);
    mBackgroundSyntaxChecker=nullptr;
    pMainWindow->onCompileFinished(true);
}

void CompilerManager::onSyntaxCheckIssue(PCompileIssue issue)
{
    if (issue->type == CompileIssueType::Error)
        mSyntaxCheckErrorCount++;
    if (issue->type == CompileIssueType::Error ||
            issue->type == CompileIssueType::Warning)
        mSyntaxCheckIssueCount++;
}

int CompilerManager::syntaxCheckIssueCount() const
{
    return mSyntaxCheckIssueCount;
}

int CompilerManager::compileIssueCount() const
{
    return mCompileIssueCount;
}

int CompilerManager::syntaxCheckErrorCount() const
{
    return mSyntaxCheckErrorCount;
}

int CompilerManager::compileErrorCount() const
{
    return mCompileErrorCount;
}

CompileError::CompileError(const QString &reason):BaseError(reason)
{

}