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#include "idocument.h"

#include "infobar.h"

#include <utils/fileutils.h>
#include <utils/qtcassert.h>

#include <QFile>
#include <QFileInfo>

/*!
    \class Core::IDocument
    \brief The IDocument class describes a document that can be saved and reloaded.

    The most common use for implementing an IDocument subclass, is as a document for an IEditor
    implementation. Multiple editors can work in the same document instance, so the IDocument
    subclass should hold all data and functions that are independent from the specific
    IEditor instance, for example the content, highlighting information, the name of the
    corresponding file, and functions for saving and reloading the file.

    Each IDocument subclass works only with the corresponding IEditor subclasses that it
    was designed to work with.

    \mainclass
*/

/*!
    \fn QString Core::IDocument::filePath() const
    Returns the absolute path of the file that this document refers to. May be empty for
    non-file documents.
    \sa setFilePath()
*/

namespace Core {

namespace Internal {

class IDocumentPrivate
{
public:
    IDocumentPrivate() :
        infoBar(0),
        temporary(false),
        hasWriteWarning(false),
        restored(false)
    {
    }

    ~IDocumentPrivate()
    {
        delete infoBar;
    }

    QString mimeType;
    Utils::FileName filePath;
    QString preferredDisplayName;
    QString uniqueDisplayName;
    QString autoSaveName;
    InfoBar *infoBar;
    Id id;
    bool temporary;
    bool hasWriteWarning;
    bool restored;
};

} // namespace Internal

IDocument::IDocument(QObject *parent) : QObject(parent),
    d(new Internal::IDocumentPrivate)
{
}

IDocument::~IDocument()
{
    removeAutoSaveFile();
    delete d;
}

void IDocument::setId(Id id)
{
    d->id = id;
}

Id IDocument::id() const
{
    QTC_CHECK(d->id.isValid());
    return d->id;
}

/*!
    Used for example by EditorManager::openEditorWithContents() to set the contents
    of this document.
    Returns if setting the contents was successful.
    The base implementation does nothing and returns false.
*/
bool IDocument::setContents(const QByteArray &contents)
{
    Q_UNUSED(contents)
    return false;
}

const Utils::FileName &IDocument::filePath() const
{
    return d->filePath;
}

IDocument::ReloadBehavior IDocument::reloadBehavior(ChangeTrigger state, ChangeType type) const
{
    if (type == TypePermissions)
        return BehaviorSilent;
    if (type == TypeContents && state == TriggerInternal && !isModified())
        return BehaviorSilent;
    return BehaviorAsk;
}

void IDocument::checkPermissions()
{
}

bool IDocument::shouldAutoSave() const
{
    return false;
}

bool IDocument::isFileReadOnly() const
{
    if (filePath().isEmpty())
        return false;
    return !filePath().toFileInfo().isWritable();
}

/*!
    Returns if the document is a temporary that should for example not be considered
    when saving/restoring the session state, recent files, etc. Defaults to false.
    \sa setTemporary()
*/
bool IDocument::isTemporary() const
{
    return d->temporary;
}

/*!
    Sets if the document is \a temporary.
    \sa isTemporary()
*/
void IDocument::setTemporary(bool temporary)
{
    d->temporary = temporary;
}

QString IDocument::mimeType() const
{
    return d->mimeType;
}

void IDocument::setMimeType(const QString &mimeType)
{
    if (d->mimeType != mimeType) {
        d->mimeType = mimeType;
        emit mimeTypeChanged();
    }
}

bool IDocument::autoSave(QString *errorString, const QString &fileName)
{
    if (!save(errorString, fileName, true))
        return false;
    d->autoSaveName = fileName;
    return true;
}

static const char kRestoredAutoSave[] = "RestoredAutoSave";

void IDocument::setRestoredFrom(const QString &name)
{
    d->autoSaveName = name;
    d->restored = true;
    InfoBarEntry info(Id(kRestoredAutoSave),
          tr("File was restored from auto-saved copy. "
             "Select Save to confirm or Revert to Saved to discard changes."));
    infoBar()->addInfo(info);
}

void IDocument::removeAutoSaveFile()
{
    if (!d->autoSaveName.isEmpty()) {
        QFile::remove(d->autoSaveName);
        d->autoSaveName.clear();
        if (d->restored) {
            d->restored = false;
            infoBar()->removeInfo(Id(kRestoredAutoSave));
        }
    }
}

bool IDocument::hasWriteWarning() const
{
    return d->hasWriteWarning;
}

void IDocument::setWriteWarning(bool has)
{
    d->hasWriteWarning = has;
}

InfoBar *IDocument::infoBar()
{
    if (!d->infoBar)
        d->infoBar = new InfoBar;
    return d->infoBar;
}

/*!
    Set absolute file path for this file to \a filePath. Can be empty.
    The default implementation sets the file name and sends filePathChanged() and changed()
    signals. Can be reimplemented by subclasses to do more.
    \sa filePath()
*/
void IDocument::setFilePath(const Utils::FileName &filePath)
{
    if (d->filePath == filePath)
        return;
    Utils::FileName oldName = d->filePath;
    d->filePath = filePath;
    emit filePathChanged(oldName, d->filePath);
    emit changed();
}

/*!
    Returns the string to display for this document, e.g. in the open document combo box
    and pane.
    The returned string has the following priority:
      * Unique display name set by the document model
      * Preferred display name set by the owner
      * Base name of the document's file name

    \sa setDisplayName()
*/
QString IDocument::displayName() const
{
    return d->uniqueDisplayName.isEmpty() ? plainDisplayName() : d->uniqueDisplayName;
}

/*!
    Sets the string that is displayed for this document, e.g. in the open document combo box
    and pane, to \a name. Defaults to the file name of the file path for this document.
    You can reset the display name to the default by passing an empty string.
    \sa displayName()
    \sa filePath()
 */
void IDocument::setPreferredDisplayName(const QString &name)
{
    if (name == d->preferredDisplayName)
        return;
    d->preferredDisplayName = name;
    emit changed();
}

/*!
    \internal
    Returns displayName without disambiguation.
 */
QString IDocument::plainDisplayName() const
{
    return d->preferredDisplayName.isEmpty() ? d->filePath.fileName() : d->preferredDisplayName;
}

/*!
    \internal
    Sets unique display name for the document. Used by the document model.
 */
void IDocument::setUniqueDisplayName(const QString &name)
{
    d->uniqueDisplayName = name;
}

} // namespace Core
