/*
 * 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.
 *
 * GROMACS is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
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 */

%ModuleHeaderCode
#include <exception>
#include "gromacs/options/basicoptions.h"
#include "gromacs/options/filenameoption.h"
#include "gromacs/selection/selectionoption.h"
#include <map>
#include <string>

class PyOptionsHolder {
public:
    class DuplicateOption : public std::exception {
    public:
        virtual const char* what() const noexcept;
    };
    gmx::DoubleOption doubleOption(const char*, double = 0);
    gmx::IntegerOption integerOption(const char*, int = 0);
    gmx::StringOption stringOption(const char*, const char* = 0);
    gmx::BooleanOption booleanOption(const char*, bool = 0);
    gmx::SelectionOption selectionOption(const char*);
    gmx::FileNameOption fileNameOption(const char*, const char* = 0);
    PyObject* get_value(const char*);
    // 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

%ModuleCode
#include "gromacs/utility/gmxassert.h"

const char* PyOptionsHolder::DuplicateOption::what() const noexcept {
    return "This option is already defined";
}

gmx::DoubleOption PyOptionsHolder::doubleOption(const char *name, double def) {
    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;
}

gmx::IntegerOption PyOptionsHolder::integerOption(const char *name, int def) {
    if (storage.count(name))
        throw DuplicateOption();

    int *store = new int;
    *store = def;
    gmx::IntegerOption option(name);
    option.store(store);
    storage[name] = {store, "i"};

    return option;
}

gmx::StringOption PyOptionsHolder::stringOption(const char *name, const char* def) {
    if (storage.count(name))
        throw DuplicateOption();

    std::string *store = new std::string;
    *store = def;
    gmx::StringOption option(name);
    option.store(store);
    storage[name] = {store, "s"};

    return option;
}

gmx::BooleanOption PyOptionsHolder::booleanOption(const char *name, bool def) {
    if (storage.count(name))
        throw DuplicateOption();

    bool *store = new bool;
    *store = def;
    gmx::BooleanOption option(name);
    option.store(store);
    storage[name] = {store, "b"};

    return option;
}

gmx::SelectionOption PyOptionsHolder::selectionOption(const char *name) {
    if (storage.count(name))
        throw DuplicateOption();

    gmx::Selection *store = new gmx::Selection;
    gmx::SelectionOption option(name);
    option.store(store);

    storage[name] = {store, "S"};

    return option;
}

gmx::FileNameOption PyOptionsHolder::fileNameOption(const char *name, const char* def) {
    if (storage.count(name))
        throw DuplicateOption();

    std::string *store = new std::string;
    gmx::FileNameOption option(name);
    option.store(store);
    option.defaultBasename(def); // Docs say to set default value like this
    storage[name] = {store, "f"};

    return option;
}

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

    option_value v = storage[name];
    switch (*v.type) {
    case 'd': // double
        return sipBuildResult(NULL, v.type, *((double*) v.value));
        break;
    case 'i': // int
        return sipBuildResult(NULL, v.type, *((int*) v.value));
        break;
    case 's': // std::string
        return sipBuildResult(NULL, v.type, ((std::string*) v.value)->data());
        break;
    case 'b': // bool
        return sipBuildResult(NULL, v.type, *((bool*) v.value));
        break;
    case 'S': // Selection
        return sipConvertFromType((gmx::Selection*) v.value, sipType_Selection, NULL);
        break;
    case 'f': // FileNameOption
        return sipBuildResult(NULL, "A", ((std::string*) v.value)->data());
        break;
    }

    GMX_ASSERT(false, "Some type is not handled in PyOptionsHolder.get_value");
    return NULL;
}
%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);
    IntegerOption integerOption(const char *name, int def = 0) throw (PyOptionsHolder::DuplicateOption);
    StringOption stringOption(const char *name, const char *def = 0) throw (PyOptionsHolder::DuplicateOption);
    BooleanOption booleanOption(const char *name, bool def = 0) throw (PyOptionsHolder::DuplicateOption);
    SelectionOption selectionOption(const char *name) throw (PyOptionsHolder::DuplicateOption);
    FileNameOption fileNameOption(const char *name, const char *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
};