#pragma once

#include <map>
#include <set>
#include <string>

/**
 * @class SensorSet
 * @brief Finds and holds the available hwmon sensors for a device
 * @details When passed a hwmon device directory on construction,
 *          this class will find all hwmon sysfs files in that directory
 *          and store them in a map.  The public begin() and end() methods
 *          on this class allow traversal of this map.
 *
 *          For example, a file named temp5_input will have a map entry of:
 *
 *              key:   pair<string, string> = {"temp", "5"}
 *              value: std::string = "input"
 */
class SensorSet
{
    public:
        typedef std::map<std::pair<std::string, std::string>,
                std::set<std::string>> container_t;
        using mapped_type = container_t::mapped_type;
        using key_type = container_t::key_type;

        /**
         * @brief Constructor
         * @details Builds a map of the hwmon sysfs files in the passed
         *          in directory.
         *
         * @param[in] path - path to the hwmon device directory
         *
         */
        explicit SensorSet(const std::string& path);
        ~SensorSet() = default;
        SensorSet() = delete;
        SensorSet(const SensorSet&) = delete;
        SensorSet& operator=(const SensorSet&) = delete;
        SensorSet(SensorSet&&) = default;
        SensorSet& operator=(SensorSet&&) = default;

        /**
         * @brief Returns an iterator to the beginning of the map
         *
         * @return const_iterator
         */
        container_t::const_iterator begin()
        {
            return const_cast<const container_t&>(container).begin();
        }

        /**
         * @brief Returns an iterator to the end of the map
         *
         * @return const_iterator
         */
        container_t::const_iterator end()
        {
            return const_cast<const container_t&>(container).end();
        }

    private:

        /**
         * @brief The map of hwmon files in the directory
         * @details For example:
         *          key = pair("temp", "1")
         *          value = "input"
         */
        container_t container;

};

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