OpenSpace/include/openspace/documentation/documentationengine.h

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 *                                                                                       *
 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2023                                                               *
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#ifndef __OPENSPACE_CORE___DOCUMENTATIONENGINE___H__
#define __OPENSPACE_CORE___DOCUMENTATIONENGINE___H__

#include <openspace/documentation/documentation.h>
#include <openspace/json.h>
#include <ghoul/misc/exception.h>

namespace openspace::documentation {

/**
 * The DocumentationEngine has the ability to collect all Documentation%s that are
 * produced in the application an write them out as a documentation file for human
 * consumption.
 */
class DocumentationEngine {
public:
    /**
     * This exception is thrown by the addDocumentation method if a provided Documentation
     * has an identifier, but the identifier was registered previously.
     */
    struct DuplicateDocumentationException : public ghoul::RuntimeError {
        /**
         * Constructor of a DuplicateDocumentationException storing the offending
         * Documentation for later use.
         *
         * \param doc The Documentation whose identifier was previously
         *        registered
         */
        DuplicateDocumentationException(Documentation doc);

        /// The offending Documentation whose identifier was previously registered
        Documentation documentation;
    };

    DocumentationEngine();

    /**
     * Adds the \p documentation to the list of Documentation%s that are written to a
     * documentation file with the writeDocumentation method.
     *
     * \param documentation The Documentation object that is to be stored for later use
     *
     * \throw DuplicateDocumentationException If the \p documentation has a non-empty
     *        identifier and it was not unique
     */
    void addDocumentation(Documentation documentation);

    /**
     * Returns a list of all registered Documentation%s.
     *
     * \return A list of all registered Documentation%s
     */
    std::vector<Documentation> documentations() const;

    static void initialize();
    static void deinitialize();
    static bool isInitialized();

    /**
     * Returns a static reference to the main singleton DocumentationEngine.
     *
     * \return A static reference to the main singleton DocumentationEngine
     */
    static DocumentationEngine& ref();

    std::string generateJson() const;

    nlohmann::json generateJsonJson() const;

private:

    /// The list of all Documentation%s that are stored by the DocumentationEngine
    std::vector<Documentation> _documentations;

    static DocumentationEngine* _instance;
};
} // namespace openspace::documentation

#define DocEng (openspace::documentation::DocumentationEngine::ref())

#endif // __OPENSPACE_CORE___DOCUMENTATIONENGINE___H__