ContentType.h

/* Copyright (C) 2020-2026 by Marc Boris Duerner
   SPDX-License-Identifier: LGPL-2.1-or-later WITH mif-exception
*/
 
#ifndef PT_MCP_CONTENTTYPE_H
#define PT_MCP_CONTENTTYPE_H
 
#include <Pt/Mcp/Api.h>
#include <Pt/Formatter.h>
#include <string>
 
namespace Pt {
 
namespace Mcp {

class PT_MCP_API ContentFormatter
{
  public:
    virtual ~ContentFormatter();

    Pt::Formatter& beginContent(std::ostream& os);

    void finishContent(std::ostream& os);
 
  protected:
    ContentFormatter();

    virtual void onBeginContent() = 0;

    virtual Pt::Formatter& onBeginFormat() = 0;

    virtual void onFinishContent() = 0;

    void write(const char* s, std::size_t n);

    std::ostream& output() const
    { return *_os; }
 
  private:
    std::ostream* _os;
};

class PT_MCP_API ContentType
{
  public:
    virtual ~ContentType();

    virtual ContentFormatter* getFormatter() const = 0;

    virtual void releaseFormatter(ContentFormatter* formatter) const = 0;
};
 

class PT_MCP_API TextContent : public ContentType
{
  public:
    TextContent();

    ContentFormatter* getFormatter() const override;

    void releaseFormatter(ContentFormatter* formatter) const override;
};

PT_MCP_API const TextContent& textContent();
 

class PT_MCP_API ImageContent : public ContentType
{
  public:
    explicit ImageContent(const std::string& mimeType = "image/png");

    ContentFormatter* getFormatter() const override;

    void releaseFormatter(ContentFormatter* formatter) const override;
 
  private:
    std::string _mimeType;
};

PT_MCP_API const ImageContent& imageContent();
 
} // namespace Mcp
 
} // namespace Pt
 
#endif // PT_MCP_CONTENTTYPE_H