/*
 * This file is part of the GROMACS molecular simulation package.
 *
 * Copyright (c) 2014, by the GROMACS development team, led by
 * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
 * and including many others, as listed in the AUTHORS file in the
 * top-level source directory and at http://www.gromacs.org.
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 */

%ModuleCode

#include "gromacs/options/basicoptions.h"
#include "gromacs/utility/gmxassert.h"
#include <map>
#include <string>
#include <exception>

class PyOptionsHolder {
public:
    class DuplicateOption : public std::exception {
    public:
        virtual const char* what() const noexcept { return "This option is already defined"; }
    };
    gmx::DoubleOption doubleOption(const char *name, double def = 0) {
        if (storage.count(name))
            throw DuplicateOption();

        double *store = new double;
        *store = def;
        gmx::DoubleOption option(name);
        option.store(store);
        storage[name] = {store, "d"};

        return option;
    }
    PyObject* get_value(const char *name) {
        if (!storage.count(name))
            return NULL;

        option_value v = storage[name];
        switch (*v.type) {
        case 'd':
            return sipBuildResult(NULL, v.type, *((double*) v.value));
            break;
        }

        GMX_ASSERT(false, "Some type is not handled in PyOptionsHolder.get_value");
        return NULL;
    }
    // TODO: destructor (need to handle each type separately)
    // TODO: support for vector options
private:
    struct option_value {
        void *value;
        const char *type;
    };
    std::map<std::string, option_value> storage;
};

%End

%Exception PyOptionsHolder::DuplicateOption {
%RaiseCode
        SIP_BLOCK_THREADS;
        PyErr_SetString(PyExc_ValueError, sipExceptionRef.what());
        SIP_UNBLOCK_THREADS;
%End
};

class PyOptionsHolder {
%TypeHeaderCode
#include "gromacs/options/basicoptions.h"
%End

public:
    DoubleOption doubleOption(const char *name, double def = 0) throw (PyOptionsHolder::DuplicateOption);
    SIP_PYOBJECT __getitem__(const char *name);
    %MethodCode
        sipRes = sipCpp->get_value(a0);

        if (!sipRes) {
            SIP_BLOCK_THREADS;
            PyErr_SetString(PyExc_KeyError, "Invalid option name");
            SIP_UNBLOCK_THREADS;
            sipIsErr = 1;
        }
    %End
};