/****************************************************************************

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Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).*

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****************************************************************************/

#include "scriptwidget.h"

#include "mazescene.h"

#include "entity.h"

static QScriptValue qsRand(QScriptContext *, QScriptEngine *engine)

{

    QScriptValue value(engine, qrand() / (RAND_MAX + 1.0));

    return value;

}

void ScriptWidget::setPreset(int preset)

{

    const char *presets[] =

    {

        "// available functions:\n"

        "// entity.turnLeft()\n"

        "// entity.turnRight()\n"

        "// entity.turnTowards(x, y)\n"

        "// entity.walk()\n"

        "// entity.stop()\n"

        "// rand()\n"

        "// script.display()\n"

        "\n"

        "// available variables:\n"

        "// my_x\n"

        "// my_y\n"

        "// player_x\n"

        "// player_y\n"

        "// time\n"

        "\n"

        "entity.stop();\n",

        "entity.walk();\n"

        "if ((time % 20000) < 10000) {\n"

        "  entity.turnTowards(10, 2.5);\n"

        "  if (my_x >= 5.5)\n"

        "    entity.stop();\n"

        "} else {\n"

        "  entity.turnTowards(-10, 2.5);\n"

        "  if (my_x <= 2.5)\n"

        "    entity.stop();\n"

        "}\n",

        "dx = player_x - my_x;\n"

        "dy = player_y - my_y;\n"

        "if (dx * dx + dy * dy < 5) {\n"

        "  entity.stop();\n"

        "} else {\n"

        "  entity.walk();\n"

        "  entity.turnTowards(player_x, player_y);\n"

        "}\n"

    };

    m_sourceEdit->setPlainText(QLatin1String(presets[preset]));

}

ScriptWidget::ScriptWidget(MazeScene *scene, Entity *entity)

    : m_scene(scene)

    , m_entity(entity)

{

    new QVBoxLayout(this);

    m_statusView = new QLineEdit;

    m_statusView->setReadOnly(true);

    layout()->addWidget(m_statusView);

    m_sourceEdit = new QPlainTextEdit;

    layout()->addWidget(m_sourceEdit);

    QPushButton *compileButton = new QPushButton(QLatin1String("Compile"));

    layout()->addWidget(compileButton);

    QComboBox *combo = new QComboBox;

    layout()->addWidget(combo);

    combo->addItem(QLatin1String("Default"));

    combo->addItem(QLatin1String("Patrol"));

    combo->addItem(QLatin1String("Follow"));

    setPreset(0);

    connect(combo, SIGNAL(currentIndexChanged(int)), this, SLOT(setPreset(int)));

    connect(compileButton, SIGNAL(clicked()), this, SLOT(updateSource()));

    m_engine = new QScriptEngine(this);

    QScriptValue entityObject = m_engine->newQObject(m_entity);

    m_engine->globalObject().setProperty("entity", entityObject);

    QScriptValue widgetObject = m_engine->newQObject(this);

    m_engine->globalObject().setProperty("script", widgetObject);

    m_engine->globalObject().setProperty("rand", m_engine->newFunction(qsRand));

    m_engine->setProcessEventsInterval(5);

    resize(300, 400);

    updateSource();

    startTimer(50);

    m_time.start();

}

void ScriptWidget::timerEvent(QTimerEvent *)

{

    QPointF player = m_scene->camera().pos();

    QPointF entity = m_entity->pos();

    QScriptValue px(m_engine, player.x());

    QScriptValue py(m_engine, player.y());

    QScriptValue ex(m_engine, entity.x());

    QScriptValue ey(m_engine, entity.y());

    QScriptValue time(m_engine, m_time.elapsed());

    m_engine->globalObject().setProperty("player_x", px);

    m_engine->globalObject().setProperty("player_y", py);

    m_engine->globalObject().setProperty("my_x", ex);

    m_engine->globalObject().setProperty("my_y", ey);

    m_engine->globalObject().setProperty("time", time);

    m_engine->evaluate(m_source);

    if (m_engine->hasUncaughtException()) {

        QString text = m_engine->uncaughtException().toString();

        m_statusView->setText(text);

    }

}

void ScriptWidget::display(QScriptValue value)

{

    m_statusView->setText(value.toString());

}

void ScriptWidget::updateSource()

{

    bool wasEvaluating = m_engine->isEvaluating();

    if (wasEvaluating)

        m_engine->abortEvaluation();

    m_time.restart();

    m_source = m_sourceEdit->toPlainText();

    if (wasEvaluating)

        m_statusView->setText(QLatin1String("Aborted long running evaluation!"));

    else if (m_engine->canEvaluate(m_source))

        m_statusView->setText(QLatin1String("Evaluation succeeded"));

    else

        m_statusView->setText(QLatin1String("Evaluation failed"));

}