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#ifndef _TEMPLATE_SCANNER_HXX
#define _TEMPLATE_SCANNER_HXX

#include "tools/AsynchronousTask.hxx"
#include "sddllapi.h"
#include <ucbhelper/content.hxx>
#include <tools/string.hxx>
#include "com/sun/star/uno/Reference.hxx"

#include <vector>
#include <boost/scoped_ptr.hpp>

namespace com { namespace sun { namespace star { namespace ucb {
class XContent;
class XCommandEnvironment;
} } } }

namespace com { namespace sun { namespace star { namespace sdbc {
class XResultSet;
} } } }

namespace sd {

/** Representation of a template or layout file.
*/
class TemplateEntry
{
public:
    TemplateEntry   (const String& rsTitle, const String& rsPath)
        :   msTitle(rsTitle), msPath(rsPath) {}

    String msTitle;
    String msPath;
};




/** Representation of a template or layout folder.
*/
class TemplateDir
{
public:
    TemplateDir (const String& rsRegion, const String& rsUrl )
        :   msRegion(rsRegion), msUrl(rsUrl), maEntries() {}

    String msRegion;
    String msUrl;
    ::std::vector<TemplateEntry*> maEntries;
};




/** This class scans the template folders for impress templates.  There are
    two ways to use this class.
    1. The old and deprecated way is to call Scan() to scan all templates
    and collect the supported ones in a tree structure.  This structure is
    returned by GetFolderList().
    2. The new way implements the AsynchronousTask interface.  Call
    RunNextStep() as long HasNextStep() returns <TRUE/>.  After every step
    GetLastAddedEntry() returns the template that was scanned (and has a
    supported format) last.  When a step does not add a new template then
    the value of the previous step is returned.
*/
class SD_DLLPUBLIC TemplateScanner
    : public ::sd::tools::AsynchronousTask
{
public:
    /** Create a new template scanner and prepare but do not execute the scanning.
    */
    TemplateScanner (void);

    /** The destructor deletes any remaining entries of the local list of
        templates.
    */
    virtual ~TemplateScanner (void);

    /** Execute the actual scanning of templates.  When this method
        terminates the result can be obtained by calling the
        <member>GetTemplateList</member> method.
    */
    void Scan (void);

    /** Return the list of template folders.  It lies in the responsibility
        of the caller to take ownership of some or all entries and remove
        them from the returned list.  All entries that remain until the
        destructor is called will be destroyed.
    */
    std::vector<TemplateDir*>& GetFolderList (void);

    /** Implementation of the AsynchronousTask interface method.
    */
    virtual void RunNextStep (void);

    /** Implementation of the AsynchronousTask interface method.
    */
    virtual bool HasNextStep (void);

    /** Return the TemplateDir object that was last added to
        mpTemplateDirectory.
        @return
            <NULL/> is returned either before the template scanning is
            started or after it has ended.
    */
    const TemplateEntry* GetLastAddedEntry (void) const;

private:
    /** The current state determines which step will be executed next by
        RunNextStep().
    */
    enum State {
        INITIALIZE_SCANNING,
        INITIALIZE_FOLDER_SCANNING,
        GATHER_FOLDER_LIST,
        SCAN_FOLDER,
        INITIALIZE_ENTRY_SCAN,
        SCAN_ENTRY,
        DONE,
        ERROR
    };
    State meState;

    ::ucbhelper::Content maFolderContent;
    TemplateDir* mpTemplateDirectory;

    /** The data structure that is to be filled with information about the
        template files.
    */
     std::vector<TemplateDir*> maFolderList;

    /** This member points into the maFolderList to the member that was most
        recently added.
    */
    TemplateEntry* mpLastAddedEntry;

    /** The folders that are collected by GatherFolderList().
    */
    class FolderDescriptorList;
    ::boost::scoped_ptr<FolderDescriptorList> mpFolderDescriptors;

    /** Set of state variables used by the methods
        InitializeFolderScanning(), GatherFolderList(), ScanFolder(),
        InitializeEntryScanning(), and ScanEntry().
    */
    com::sun::star::uno::Reference<com::sun::star::ucb::XContent> mxTemplateRoot;
    com::sun::star::uno::Reference<com::sun::star::ucb::XCommandEnvironment> mxFolderEnvironment;
    com::sun::star::uno::Reference<com::sun::star::ucb::XCommandEnvironment> mxEntryEnvironment;
    com::sun::star::uno::Reference<com::sun::star::sdbc::XResultSet> mxFolderResultSet;
    com::sun::star::uno::Reference<com::sun::star::sdbc::XResultSet> mxEntryResultSet;

    /** Obtain the root folder of the template folder hierarchy.  The result
        is stored in mxTemplateRoot for later use.
    */
    State GetTemplateRoot (void);

    /** Initialize the scanning of folders.  This is called exactly once.
        @return
            Returns one of the two states ERROR or GATHER_FOLDER_LIST.
    */
    State InitializeFolderScanning (void);

    /** Collect all available top-level folders in an ordered list which can
        then be processed by ScanFolder().
        @return
            Returns one of the two states ERROR or SCAN_FOLDER.
    */
    State GatherFolderList (void);

    /** From the list of top-level folders collected by GatherFolderList()
        the one with highest priority is processed.
        @return
            Returns one of the states ERROR, DONE, or INITILIZE_ENTRY_SCAN.
    */
    State ScanFolder (void);

    /** Initialize the scanning of entries of a top-level folder.
        @return
            Returns one of the states ERROR or SCAN_ENTRY.
    */
    State InitializeEntryScanning (void);

    /** Scan one entry.  When this entry matches the recognized template
        types it is appended to the result set.
        @return
            Returns one of the states ERROR, SCAN_ENTRY, or SCAN_FOLDER.
    */
    State ScanEntry (void);
};

} // end of namespace sd

#endif