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#include <qscriptengine.h>

#include <QtCore/QFile>

#include <QtCore/QTextStream>

#include <QtCore/QStringList>

#include <QtGui/QApplication>

#include <stdlib.h>

#include "bytearrayclass.h"

static bool wantsToQuit;

static QScriptValue qtscript_quit(QScriptContext *ctx, QScriptEngine *eng)

{

    Q_UNUSED(ctx);

    wantsToQuit = true;

    return eng->undefinedValue();

}

static void interactive(QScriptEngine *eng)

{

    QScriptValue global = eng->globalObject();

    QScriptValue quitFunction = eng->newFunction(qtscript_quit);

    if (!global.property(QLatin1String("exit")).isValid())

        global.setProperty(QLatin1String("exit"), quitFunction);

    if (!global.property(QLatin1String("quit")).isValid())

        global.setProperty(QLatin1String("quit"), quitFunction);

    wantsToQuit = false;

    QTextStream qin(stdin, QFile::ReadOnly);

    const char *qscript_prompt = "qs> ";

    const char *dot_prompt = ".... ";

    const char *prompt = qscript_prompt;

    QString code;

    forever {

        QString line;

        printf("%s", prompt);

        fflush(stdout);

        line = qin.readLine();

        if (line.isNull())

            break;

        code += line;

        code += QLatin1Char('\n');

        if (line.trimmed().isEmpty()) {

            continue;

        } else if (! eng->canEvaluate(code)) {

            prompt = dot_prompt;

        } else {

            QScriptValue result = eng->evaluate(code, QLatin1String("typein"));

            code.clear();

            prompt = qscript_prompt;

            if (! result.isUndefined())

                fprintf(stderr, "%s\n", qPrintable(result.toString()));

            if (wantsToQuit)

                break;

        }

    }

}

static QScriptValue importExtension(QScriptContext *context, QScriptEngine *engine)

{

    return engine->importExtension(context->argument(0).toString());

}

static QScriptValue loadScripts(QScriptContext *context, QScriptEngine *engine)

{

    for (int i = 0; i < context->argumentCount(); ++i) {

        QString fileName = context->argument(0).toString();

        QFile file(fileName);

        if (!file.open(QIODevice::ReadOnly))

            return context->throwError(QString::fromLatin1("could not open %0 for reading").arg(fileName));

        QTextStream ts(&file);

        QString contents = ts.readAll();

        file.close();

        QScriptContext *pc = context->parentContext();

        context->setActivationObject(pc->activationObject());

        context->setThisObject(pc->thisObject());

        QScriptValue ret = engine->evaluate(contents);

        if (engine->hasUncaughtException())

            return ret;

    }

    return engine->undefinedValue();

}

int main(int argc, char *argv[])

{

    QApplication *app;

    if (argc >= 2 && !qstrcmp(argv[1], "-tty")) {

        ++argv;

       --argc;

        app = new QApplication(argc, argv, QApplication::Tty);

    } else {

        app = new QApplication(argc, argv);

    }

    QScriptEngine *eng = new QScriptEngine();

    QScriptValue globalObject = eng->globalObject();

    globalObject.setProperty("load", eng->newFunction(loadScripts, /*length=*/1));

    {

        if (!globalObject.property("qt").isObject())

            globalObject.setProperty("qt", eng->newObject());            

        QScriptValue qscript = eng->newObject();

        qscript.setProperty("importExtension", eng->newFunction(importExtension));

        globalObject.property("qt").setProperty("script", qscript);

    }

    ByteArrayClass *byteArrayClass = new ByteArrayClass(eng);

    globalObject.setProperty("ByteArray", byteArrayClass->constructor());

    if (! *++argv) {

        interactive(eng);

        return EXIT_SUCCESS;

    }

    while (const char *arg = *argv++) {

        QString fn = QString::fromLocal8Bit(arg);

        if (fn == QLatin1String("-i")) {

            interactive(eng);

            break;

        }

        QString contents;

        int lineNumber = 1;

        if (fn == QLatin1String("-")) {

            QTextStream stream(stdin, QFile::ReadOnly);

            contents = stream.readAll();

        }

        else {

            QFile file(fn);

            if (file.open(QFile::ReadOnly)) {

                QTextStream stream(&file);

                contents = stream.readAll();

                file.close();

                // strip off #!/usr/bin/env qscript line

                if (contents.startsWith("#!")) {

                    contents.remove(0, contents.indexOf("\n"));

                    ++lineNumber;

                }

            }

        }

        if (contents.isEmpty())

            continue;

        QScriptValue r = eng->evaluate(contents, fn, lineNumber);

        if (eng->hasUncaughtException()) {

            QStringList backtrace = eng->uncaughtExceptionBacktrace();

            fprintf (stderr, "    %s\n%s\n\n", qPrintable(r.toString()),

                     qPrintable(backtrace.join("\n")));

            return EXIT_FAILURE;

        }

    }

    delete eng;

    delete app;

    return EXIT_SUCCESS;

}