/*GRB*

    Gerbera - https://gerbera.io/

    config_setup_enum.h - this file is part of Gerbera.

    Copyright (C) 2020-2026 Gerbera Contributors

    Gerbera is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License version 2
    as published by the Free Software Foundation.

    Gerbera is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with Gerbera.  If not, see <http://www.gnu.org/licenses/>.

    $Id$
*/

/// @file config/setup/config_setup_enum.h

#ifndef __CONFIG_SETUP_ENUM_H__
#define __CONFIG_SETUP_ENUM_H__

#include "config/config_option_enum.h"
#include "config/config_setup.h"
#include "util/logger.h"

#include <pugixml.hpp>

template <class En>
class ConfigEnumSetup : public ConfigSetup {
protected:
    bool notEmpty = true;
    std::map<std::string, En> valueMap;
    using EnumParsingFunction = En (*)(const std::string&);
    using EnumPrintingFunction = std::string (*)(En);
    EnumParsingFunction parsingFunction = nullptr;
    EnumPrintingFunction printingFunction = nullptr;

public:
    ConfigEnumSetup(
        ConfigVal option,
        const char* xpath,
        const char* help,
        std::map<std::string, En> valueMap,
        bool notEmpty = false)
        : ConfigSetup(option, xpath, help, false, "")
        , notEmpty(notEmpty)
        , valueMap(std::move(valueMap))
    {
    }

    ConfigEnumSetup(
        ConfigVal option,
        const char* xpath,
        const char* help,
        En defaultValue,
        std::map<std::string, En> valueMap,
        bool notEmpty = false)
        : ConfigSetup(option, xpath, help, false, "")
        , notEmpty(notEmpty)
        , valueMap(std::move(valueMap))
    {
        this->defaultValue = mapEnumValue(defaultValue);
    }

    ConfigEnumSetup(
        ConfigVal option,
        const char* xpath,
        const char* help,
        En defaultValue,
        EnumParsingFunction parsingFunction,
        EnumPrintingFunction printingFunction,
        bool notEmpty = false)
        : ConfigSetup(option, xpath, help, false, "")
        , notEmpty(notEmpty)
        , parsingFunction(parsingFunction)
        , printingFunction(printingFunction)
    {
        this->defaultValue = printingFunction(defaultValue);
    }

    std::string getTypeString() const override { return "Enum"; }

    void makeOption(
        const pugi::xml_node& root,
        const std::shared_ptr<Config>& config,
        const std::map<std::string, std::string>* arguments = nullptr) override
    {
        if (arguments && arguments->find("notEmpty") != arguments->end()) {
            notEmpty = arguments->find("notEmpty")->second == "true";
        }
        newOption(ConfigSetup::getXmlContent(root, config, true));
        setOption(config);
    }

    void makeOption(
        std::string optValue,
        const std::shared_ptr<Config>& config,
        const std::map<std::string, std::string>* arguments = nullptr) override
    {
        if (arguments && arguments->find("notEmpty") != arguments->end()) {
            notEmpty = arguments->find("notEmpty")->second == "true";
        }
        newOption(optValue);
        setOption(config);
    }

    bool checkEnumValue(const std::string& value, En& result) const
    {
        try {
            if (parsingFunction) {
                result = parsingFunction(value);
                return true;
            } else if (valueMap.find(value) != valueMap.end()) {
                result = valueMap.at(value);
                return true;
            } else {
                for (auto&& val : valueMap) {
                    if (fmt::to_string(val.second) == value) {
                        result = val.second;
                        return true;
                    }
                }
            }
        } catch (const std::out_of_range& ex) {
            log_error("Could not map '{}' for {}", value, xpath, ex.what());
        } catch (const std::runtime_error& ex) {
            log_error("Could not map '{}' for {}", value, xpath, ex.what());
        }
        return false;
    }

    std::string mapEnumValue(En value) const
    {
        if (printingFunction) {
            return printingFunction(value);
        }
        for (auto&& [key, val] : valueMap) {
            if (val == value)
                return key;
        }
        return "";
    }

    En getXmlContent(
        const pugi::xml_node& root,
        const std::shared_ptr<Config>& config)
    {
        std::string optValue = ConfigSetup::getXmlContent(root, config, true);
        log_debug("Config: option: '{}' value: '{}'", xpath, optValue);
        if (notEmpty && optValue.empty()) {
            throw_std_runtime_error("Error in config file: Invalid {}/{} empty value '{}'", root.path(), xpath, optValue);
        }
        En result;
        if (!checkEnumValue(optValue, result)) {
            throw_std_runtime_error("Error in config file: {}/{} unsupported Enum value '{}'", root.path(), xpath, optValue);
        }
        return result;
    }

    std::shared_ptr<ConfigOption> newOption(const std::string& optValue)
    {
        if (notEmpty && optValue.empty()) {
            throw_std_runtime_error("Invalid {} empty value '{}'", xpath, optValue);
        }
        En result;
        if (!checkEnumValue(optValue, result)) {
            throw_std_runtime_error("Error in config file: {} unsupported Enum value '{}'", xpath, optValue);
        }
        optionValue = std::make_shared<EnumOption<En>>(result, mapEnumValue(result));
        return optionValue;
    }
};

#endif // __CONFIG_SETUP_ENUM_H__
