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#include <com/sun/star/uno/XComponentContext.hpp>

#include <rtl/ref.hxx>
#include <rtl/ustring.hxx>
#include <osl/conditn.hxx>
#include <osl/file.h>

struct DownloadInteractionHandler : public rtl::IReference
{
    virtual bool checkDownloadDestination(const rtl::OUString& rFileName) = 0;

    // called if the destination file already exists, but resume is false
    virtual bool downloadTargetExists(const rtl::OUString& rFileName) = 0;

    // called when curl reports an error
    virtual void downloadStalled(const rtl::OUString& rErrorMessage) = 0;

    // progress handler
    virtual void downloadProgressAt(sal_Int8 nPercent) = 0;

    // called on first progress notification
    virtual void downloadStarted(const rtl::OUString& rFileName, sal_Int64 nFileSize) = 0;

    // called when download has been finished
    virtual void downloadFinished(const rtl::OUString& rFileName) = 0;
};


class Download
{
public:
    Download(const com::sun::star::uno::Reference< com::sun::star::uno::XComponentContext >& xContext,
             const rtl::Reference< DownloadInteractionHandler >& rHandler) : m_xContext(xContext), m_aHandler(rHandler) {};

    // returns true when the content of rURL was successfully written to rLocalFile
    bool start(const rtl::OUString& rURL, const rtl::OUString& rFile, const rtl::OUString& rDestinationDir);

    // stops the download after the next write operation
    void stop();

    // returns true if the stop condition is set
    bool isStopped() const
        { return sal_True == const_cast <Download *> (this)->m_aCondition.check(); };

protected:

    // Determines the appropriate proxy settings for the given URL. Returns true if a proxy should be used
    void getProxyForURL(const rtl::OUString& rURL, rtl::OString& rHost, sal_Int32& rPort) const;

private:
    osl::Condition m_aCondition;
    const com::sun::star::uno::Reference< com::sun::star::uno::XComponentContext >& m_xContext;
    const rtl::Reference< DownloadInteractionHandler > m_aHandler;
};