/disk1/scratch/aselle/projects/seexpr/SeExpr/src/SeExprEditor/SeExprEdBrowser.cpp

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/*
* (c) Disney Enterprises, Inc.  All rights reserved.
*
* This file is licensed under the terms of the Microsoft Public License (MS-PL)
* as defined at: http://opensource.org/licenses/MS-PL.
*
* A complete copy of this license is included in this distribution as the file
* LICENSE.
*
* @file SeExprEdExpression.h
* @brief A basic expression context for the expression previewer
* @author  aselle
*/
#include <QtGui/QTreeWidget>
#include <QtGui/QTreeWidgetItem>
#include <QtGui/QVBoxLayout>
#include <QtGui/QTabWidget>
#include <QtGui/QHeaderView>
#include <QtGui/QLabel>
#include <QtGui/QTextBrowser>
#include <QtGui/QPushButton>
#include <QtGui/QSpacerItem>
#include <QtGui/QSizePolicy>
#include <QtGui/QSortFilterProxyModel>
#include <QtCore/QDir>
#include <QtCore/QFileInfo>
#include <QtGui/QFileDialog>
#include <QtGui/QMessageBox>
#include <cassert>
#include "SeExprEditor.h"
#include "SeExprEdBrowser.h"

#define P3D_CONFIG_ENVVAR "P3D_CONFIG_PATH"


class SeExprEdTreeItem
{
public:
    SeExprEdTreeItem(SeExprEdTreeItem* parent,const QString& label,const QString& path)
        :row(-1),parent(parent),label(label),path(path),populated(parent==0)
    {}

    ~SeExprEdTreeItem()
    {
        for(unsigned int i=0;i<children.size();i++)
            delete children[i];
    }

    SeExprEdTreeItem* find(QString path)
    {
        if(this->path==path) return this;
        else{
            populate();
            for(unsigned int i=0;i<children.size();i++){
                SeExprEdTreeItem* ret=children[i]->find(path);
                if(ret) return ret;
            }
        }
        return 0;
    }

    void clear()
    {
        for(unsigned int i=0;i<children.size();i++) {
            delete children[i];
        }
        children.clear();
    }

    void populate()
    {
        if(populated) return;
        populated=true;
        QFileInfo info(path);
        if(info.isDir()){
            QFileInfoList infos=QDir(path).entryInfoList(QDir::Dirs | QDir::Files | QDir::NoDotAndDotDot);

            //std::cerr<<"is dir and populating "<<path.toStdString()<<std::endl;
            for(QList<QFileInfo>::ConstIterator it=infos.constBegin();it!=infos.constEnd();++it){
                const QFileInfo* fi=&*it;
                if(fi->isDir() || fi->fileName().endsWith(".se")){
                    addChild(new SeExprEdTreeItem(this,fi->fileName(),fi->filePath()));
                }
            }
        }
    }

    void addChild(SeExprEdTreeItem* child)
    {
        child->row=children.size();
        children.push_back(child);
    }

    SeExprEdTreeItem* getChild(const int row)
    {
        populate();
        if(row<0 || row>(int)children.size()){
            assert(false);
        }
        return children[row];
    }

    int getChildCount()
    {
        populate();
        return children.size();
    }

    void regen()
    {
        std::vector<QString> labels,paths;
        for(unsigned int i=0;i<children.size();i++){
            labels.push_back(children[i]->label);
            paths.push_back(children[i]->path);
            delete children[i];
        }
        children.clear();

        for(unsigned int i=0;i<labels.size();i++)
            addChild(new SeExprEdTreeItem(this,labels[i],paths[i]));

    }

    int row;
    SeExprEdTreeItem* parent;
    QString label;
    QString path;
private:
    std::vector<SeExprEdTreeItem*> children;
    bool populated;
};

class SeExprEdTreeModel:public QAbstractItemModel
{
    SeExprEdTreeItem* root;
public:
    SeExprEdTreeModel()
        :root(new SeExprEdTreeItem(0,"",""))
    {}

    ~SeExprEdTreeModel()
    {
        delete root;
    }

    void update()
    {
        reset();
    }

    void clear()
    {
        root->clear();
        update();
    }

    void addPath(const char* label,const char* path)
    {
        root->addChild(new SeExprEdTreeItem(root,label,path));
    }

    QModelIndex parent(const QModelIndex& index) const
    {
        if(!index.isValid()) return QModelIndex();
        SeExprEdTreeItem* item=(SeExprEdTreeItem*)(index.internalPointer());
        SeExprEdTreeItem* parentItem=item->parent;
        if(parentItem==root) return QModelIndex();
        else return createIndex(parentItem->row,0,parentItem);
    }

    QModelIndex index(int row,int column,const QModelIndex& parent=QModelIndex()) const
    {
        if(!hasIndex(row,column,parent))
            return QModelIndex();
        else if(!parent.isValid()) return createIndex(row,column,root->getChild(row));
        else{
            SeExprEdTreeItem* item=(SeExprEdTreeItem*)(parent.internalPointer());
            return createIndex(row,column,item->getChild(row));
        }
    }

    int columnCount(const QModelIndex& parent) const
    {Q_UNUSED(parent); return 1;}

    int rowCount(const QModelIndex& parent=QModelIndex()) const
    {
        if(!parent.isValid()) return root->getChildCount();
        else{
            SeExprEdTreeItem* item=(SeExprEdTreeItem*)(parent.internalPointer());
            if(!item) return root->getChildCount();
            else return item->getChildCount();
        }
    }

    QVariant data(const QModelIndex& index,int role=Qt::DisplayRole) const
    {
        if(!index.isValid()) return QVariant();
        if(role!=Qt::DisplayRole) return QVariant();
        SeExprEdTreeItem* item=(SeExprEdTreeItem*)(index.internalPointer());
        if(!item) return QVariant();
        else return QVariant(item->label);
    }

    QModelIndex find(QString path)
    {
        SeExprEdTreeItem* item=root->find(path);
        if(!item) {
            root->regen();
            reset();
            item=root->find(path);
        }
        if(item){
            std::cerr<<"found it "<<std::endl;
            return createIndex(item->row,0,item);
        }

        return QModelIndex();
    }

};

class SeExprEdTreeFilterModel:public QSortFilterProxyModel
{
public:
    SeExprEdTreeFilterModel(QWidget* parent=0)
        :QSortFilterProxyModel(parent)
    {}

    void update()
    {
        reset();
    }

    bool filterAcceptsRow(int sourceRow, const QModelIndex& sourceParent) const
    {
        if(sourceParent.isValid() &&
            sourceModel()->data(sourceParent).toString().contains(filterRegExp())) return true;
        QString data=sourceModel()->data(sourceModel()->index(sourceRow,0,sourceParent)).toString();
        bool keep=data.contains(filterRegExp());

        QModelIndex subIndex=sourceModel()->index(sourceRow,0,sourceParent);
        if(subIndex.isValid()){
            for(int i=0;i<sourceModel()->rowCount(subIndex);++i)
                keep = keep || filterAcceptsRow(i, subIndex);
        }
        return keep;
    }

};

SeExprEdBrowser::~SeExprEdBrowser()
{
    delete treeModel;
}

SeExprEdBrowser::SeExprEdBrowser(QWidget* parent, SeExprEditor* editor)
    :QWidget(parent),editor(editor),
     _context(""),
     _searchPath("")
{
    QVBoxLayout* rootLayout = new QVBoxLayout;
    rootLayout->setMargin(0);
    this->setLayout(rootLayout);
    // search and clear widgets
    QHBoxLayout* searchAndClearLayout=new QHBoxLayout();
    exprFilter=new QLineEdit();
    connect(exprFilter,SIGNAL(textChanged(const QString&)),SLOT(filterChanged(const QString&)));
    searchAndClearLayout->addWidget(exprFilter,2);
    QPushButton* clearFilterButton=new QPushButton("X");
    clearFilterButton->setFixedWidth(24);
    searchAndClearLayout->addWidget(clearFilterButton,1);
    rootLayout->addLayout(searchAndClearLayout);
    connect(clearFilterButton,SIGNAL(clicked()),SLOT(clearFilter()));
    // model of tree
    treeModel=new SeExprEdTreeModel();
    proxyModel=new SeExprEdTreeFilterModel(this);
    proxyModel->setSourceModel(treeModel);
    // tree widget
    treeNew=new QTreeView;
    treeNew->setModel(proxyModel);
    treeNew->hideColumn(1);
    treeNew->setHeaderHidden(true);
    rootLayout->addWidget(treeNew);
    // selection mode and signal
    treeNew->setSelectionMode(QAbstractItemView::SingleSelection);
    connect(treeNew->selectionModel(),SIGNAL(currentChanged(const QModelIndex&,const QModelIndex&)),SLOT(handleSelection(const QModelIndex&,const QModelIndex&)));
}

void SeExprEdBrowser::addPath(const std::string& name,const std::string& path)
{
    labels.append(QString::fromStdString(name));
    paths.append(QString::fromStdString(path));
    treeModel->addPath(name.c_str(),path.c_str());
}

void SeExprEdBrowser::setSearchPath(const QString& context, const QString& path)
{
    _context = context.toStdString();
    _searchPath = path.toStdString();
}

std::string SeExprEdBrowser::getSelectedPath()
{
    QModelIndex sel=treeNew->currentIndex();
    if(sel.isValid()){
        QModelIndex realCurrent=proxyModel->mapToSource(sel);
        SeExprEdTreeItem* item=(SeExprEdTreeItem*)realCurrent.internalPointer();
        return item->path.toStdString();
    }
    return std::string("");
}

void SeExprEdBrowser::selectPath(const char * path)
{
    QModelIndex index=treeModel->find(path);
    treeNew->setCurrentIndex(proxyModel->mapFromSource(index));
}

void SeExprEdBrowser::update()
{
    treeModel->update();
    proxyModel->update();
}

void SeExprEdBrowser::handleSelection(const QModelIndex& current,const QModelIndex& previous)
{
    Q_UNUSED(previous)
    if(current.isValid()){
        QModelIndex realCurrent=proxyModel->mapToSource(current);
        SeExprEdTreeItem* item=(SeExprEdTreeItem*)realCurrent.internalPointer();
        QString path=item->path;
        if(path.endsWith(".se")){
            std::ifstream file(path.toStdString().c_str());
            std::string fileContents((std::istreambuf_iterator<char>(file)),std::istreambuf_iterator<char>());
            editor->setExpr(fileContents,true);
        }
    }
}

void SeExprEdBrowser::clear()
{
    labels.clear();
    paths.clear();
    clearSelection();

    treeModel->clear();
}


void SeExprEdBrowser::clearSelection()
{
    treeNew->clearSelection();
}

void SeExprEdBrowser::clearFilter()
{
    exprFilter->clear();
}

void SeExprEdBrowser::filterChanged(const QString& str)
{
    proxyModel->setFilterRegExp(QRegExp(str));
    proxyModel->setFilterKeyColumn(0);
    if(str!=""){
        treeNew->expandAll();
    }else{
        treeNew->collapseAll();
    }
}

void SeExprEdBrowser::saveExpressionAs()
{
    QString path = QFileDialog::getSaveFileName(
            this, "Save Expression", QString::fromStdString(_userExprDir),
            "*.se");

    if (path.length() > 0) {
        std::ofstream file(path.toStdString().c_str());
        if (!file) {
            QString msg = QString("Could not open file %1 for writing").arg(path);
            QMessageBox::warning(this, "Error",
                    QString("<font face=fixed>%1</font>")
                    .arg(msg));
            return;
        }
        file << editor->getExpr();
        file.close();

        update();
        selectPath(path.toStdString().c_str());
    }
}

void SeExprEdBrowser::saveLocalExpressionAs()
{
    QString path = QFileDialog::getSaveFileName(
            this, "Save Expression", QString::fromStdString(_localExprDir),
            "*.se");

    if (path.length() > 0) {
        std::ofstream file(path.toStdString().c_str());
        if (!file) {
            QString msg = QString("Could not open file %1 for writing").arg(path);
            QMessageBox::warning(this, "Error",
                    QString("<font face=fixed>%1</font>")
                    .arg(msg));
            return;
        }
        file << editor->getExpr();
        file.close();

        update();
        selectPath(path.toStdString().c_str());
    }
}


void SeExprEdBrowser::saveExpression()
{
    std::string path = getSelectedPath();
    if (path.length() == 0) {
        saveExpressionAs();
        return;
    }
    std::ofstream file(path.c_str());
    if (!file) {
        QString msg = QString("Could not open file %1 for writing.  Is it read-only?").arg(QString::fromStdString(path));
        QMessageBox::warning(this, "Error",
                QString("<font face=fixed>%1</font>")
                .arg(msg));
        return;
    }
    file << editor->getExpr();
    file.close();
}

void SeExprEdBrowser::expandAll()
{
    treeNew->expandAll();
}


/*
 * NOTE: The hard-coded paint3d assumptions can be removed once
 * it (and bonsai?) are adjusted to call setSearchPath(context, path)
 */

bool SeExprEdBrowser::getExpressionDirs()
{
    const char *env;
    bool enableLocal = false;
    /*bool homeFound = false; -- for xgen's config.txt UserRepo section below */

    if (_searchPath.length() > 0)
        env = _searchPath.c_str();
    else
        env = getenv(P3D_CONFIG_ENVVAR); /* For backwards compatibility */

    if (!env)
        return enableLocal;

    std::string context;
    if (_context.length() > 0) {
        context = _context;
    } else {
        context = "paint3d"; /* For backwards compatibility */
    }

    clear();

    std::string configFile=std::string(env)+"/config.txt";
    std::ifstream file(configFile.c_str());
    if(file){

        std::string key;
        while(file){
            file>>key;

            if(key[0]=='#'){
                char buffer[1024];
                file.getline(buffer,1024);
            } else {
                if (key=="ExpressionDir"){
                    std::string label,path;
                    file>>label;
                    file>>path;
                    if(QDir(QString(path.c_str())).exists())
                        addPath(label,path);
                } else if (key=="ExpressionSubDir"){
                    std::string path;
                    file>>path;
                    _localExprDir=path;
                    if(QDir(QString(path.c_str())).exists()){
                        addPath("Local",_localExprDir);
                        enableLocal=true;
                    }
                /* These are for compatibility with xgen.
                 * Long-term, xgen should use the same format.
                 * Longer-term, we should use JSON or something */
                } else if (key == "GlobalRepo") {
                    std::string path;
                    file>>path;
                    path += "/expressions/";
                    if(QDir(QString(path.c_str())).exists())
                        addPath("Global", path);
                } else if (key == "LocalRepo") {
                    std::string path;
                    file>>path;
                    path += "/expressions/";
                    _localExprDir=path;
                    if(QDir(QString(path.c_str())).exists()){
                        addPath("Local",_localExprDir);
                        enableLocal=true;
                    }

                /*
                 * xgen's config.txt has a "UserRepo" section but we
                 * intentionally ignore it since we already add the user dir
                 * down where the HOME stuff is handled
                 */

                /*
                } else if (key == "UserRepo") {
                    std::string path;
                    file>>path;
                    path += "/expressions/";

                    size_t found = path.find("${HOME}");

                    if (found != std::string::npos) {
                        char *homepath = getenv("HOME");
                        if (homepath) {
                            path.replace(found, strlen("${HOME}"), homepath);
                        } else {
                            continue;
                        }
                    }
                    if(QDir(QString(path.c_str())).exists()){
                        addPath("User", path);
                        homeFound = true;
                    }
                */
                } else{
                    char buffer[1024];
                    file.getline(buffer,1024);
                }
            }
        }
    }
    /* TODO refactor! */
    char* homepath = getenv("HOME");
    if(homepath){
        std::string path= std::string(homepath) + "/" + context + "/expressions/";
        if(QDir(QString(path.c_str())).exists()){
            _userExprDir=path;
            addPath("My Expressions",path);
        }
    }
    update();
    return enableLocal;
}

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