#ifndef OSGINTROSPECTION_EXCEPTIONS_
#define OSGINTROSPECTION_EXCEPTIONS_

#include <string>
#include <typeinfo>

namespace osgIntrospection
{

    class Exception
    {
    public:
        Exception(const std::string &msg): msg_(msg) {}
        const std::string &what() const throw()  { return msg_; }

    private:
        std::string msg_;
    };

    struct ReflectionException: public Exception 
    {
        ReflectionException(const std::string &msg): Exception(msg) {}
    };

    struct TypeNotDefinedException: public ReflectionException
    {
        TypeNotDefinedException(const std::type_info &ti)
        :    ReflectionException("type `" + std::string(ti.name()) + "' is declared but not defined")
        {
        }
    };

    struct TypeIsAbstractException: public ReflectionException
    {
        TypeIsAbstractException(const std::type_info &ti)
        :    ReflectionException("cannot create instances of abstract type `" + std::string(ti.name()) + "'")
        {
        }
    };

    struct InvalidFunctionPointerException: public ReflectionException
    {
        InvalidFunctionPointerException()
        :    ReflectionException("invalid function pointer during invoke()")
        {
        }
    };

    struct ConstIsConstException: public ReflectionException
    {
        ConstIsConstException()
        :    ReflectionException("cannot modify a const value")
        {
        }
    };

    struct EmptyValueException: public ReflectionException
    {
        EmptyValueException()
        :    ReflectionException("cannot retrieve an empty value")
        {
        }
    };
    
    struct TypeNotFoundException: public ReflectionException
    {
        TypeNotFoundException(const std::string &qname)
        :    ReflectionException("type `" + qname + "' not found")
        {
        }
    };

    struct MethodNotFoundException: public ReflectionException
    {
        MethodNotFoundException(const std::string &name, const std::string &cname)
        :    ReflectionException("could not find a suitable method of name `" + name + "' in class `" + cname + "'")
        {
        }
    };

    struct StreamWriteErrorException: public ReflectionException
    {
        StreamWriteErrorException()
        :    ReflectionException("an error occured while trying to write to a stream")
        {
        }
    };

    struct StreamReadErrorException: public ReflectionException
    {
        StreamReadErrorException()
        :    ReflectionException("an error occured while trying to read from a stream")
        {
        }
    };

    class StreamingNotSupportedException: public ReflectionException
    {
    public:
        enum OperationType
        {
            ANY,
            TEXT_WRITE,
            TEXT_READ,
            BINARY_WRITE,
            BINARY_READ
        };

        StreamingNotSupportedException(OperationType op, const std::type_info &type)
        :    ReflectionException(build_msg(op, type))
        {
        }

    private:
        std::string build_msg(OperationType op, const std::type_info &type)
        {
            std::string opstr;
            switch (op)
            {
            case TEXT_WRITE: opstr = "writing to text stream"; break;
            case TEXT_READ: opstr = "reading from text stream"; break;
            case BINARY_WRITE: opstr = "writing to binary stream"; break;
            case BINARY_READ: opstr = "reading from binary stream"; break;
            case ANY:
            default: opstr = "streaming";
            }
            return opstr + std::string(" is not supported on type `" + std::string(type.name()) + "'");
        }
    };

    struct TypeConversionException: public ReflectionException
    {
        TypeConversionException(const std::type_info &type1, const std::type_info &type2)
        :    ReflectionException("cannot convert from type `" + std::string(type1.name()) + "' to type `" + std::string(type2.name()) + "'")
        {
        }
    };

    class PropertyAccessException: public ReflectionException
    {
    public:
        enum AccessType
        {
            GET,
            SET,
            IGET,
            ISET,
            AGET,
            ASET,
            ADD,
            COUNT
        };

        PropertyAccessException(const std::string &pname, AccessType denied)
        :    ReflectionException(build_msg(pname, denied))
        {
        }

    private:
        std::string build_msg(const std::string &pname, AccessType denied) const
        {
            std::string msg;
            switch (denied)
            {
            case GET: msg = "retrieved"; break;
            case SET: msg = "set"; break;
            case IGET: msg = "retrieved with indices"; break;
            case ISET: msg = "set with indices"; break;
            case AGET: msg = "retrieved with array index"; break;
            case ASET: msg = "set with array index"; break;
            case ADD: msg = "added"; break;
            case COUNT: msg = "counted"; break;
            default: msg = "?";
            }
            return std::string("value for property `" + pname + "' cannot be " + msg);
        }
    };

    struct IndexValuesNotDefinedException: ReflectionException
    {
        IndexValuesNotDefinedException(const std::string &name, const std::string &iname)
            :    ReflectionException("couldn't determine a finite set of values for index `" + iname + "' of property `" + name + "'. Make sure that either: 1) the index is an enumeration, or 2) a valid custom indexing attribute was assigned to the property.")
        {
        }
    };

}

#endif