#ifndef STA_UTILS_LOGGER_HPP
#define STA_UTILS_LOGGER_HPP

#include <sta/drivers/w25qxx.hpp>
#include <sta/debug/assert.hpp>

#include <cstring>

namespace sta
{
    template <typename T>
    class Logger
    {
    public:
        /**
         * @brief Constructs a logger object which manages reading and writing data to a segment of a flash chip.
         * 
         * @param flash The flash chip to use for logging.
         * @param startSector The index of the start sector (1 LSB = 4096 bytes).
         * @param endSector The index of the end sector (1 LSB = 4096 bytes).
         */
        Logger(W25Qxx * flash, uint32_t startSector, uint32_t endSector);
        
        void findLast();

        bool write(T* data);

        /**
         * @brief Write a new data point to the flash chip. 
         * @note If the total capacity of this logger was exceeded, it restarts at the first sector, overwriting its data.
         * 
         * @param data The data to write to the flash chip. 
         * @return true if successful, false if the segment end was reached.
         */
        bool write(T data);

        /**
         * @brief Clear the flash memory used by the logger.
         * 
         */
        void clear();

        /**
         * @brief Get the number of data points currently written to the memory segment.
         * 
         * @return size_t The number of data points.
         */
        size_t count();

        /**
         * @brief Get the number of data points that can be written to the logger before an overflow occurs.
         * 
         * @return size_t The number of data points.
         */
        size_t remaining();

        /**
         * @brief Get the total number of data points that fit into the logger.
         * 
         * @return size_t The number of data points.
         */
        size_t capacity();

        /**
         * @brief Get the ith element stored in the flash storage.
         * 
         * @param i The index of the element to read. 
         * @return T The ith element stored in the flash storage.
         */
        T get(std::size_t i);

        /**
         * @brief Get the ith element stored in the flash storage.
         * 
         * @param i The index of the element to read. 
         * @return T The ith element stored in the flash storage.
         */
        T operator[](std::size_t i);
    private:
        bool searchCriterion(uint8_t * buffer);

        W25Qxx * flash_;
        uint32_t start_;
        uint32_t end_;
        uint32_t address_;

        uint8_t buffer_[W25QXX_PAGE_SIZE];
        bool flushed_;
        uint32_t ptr_;
    };
} // namespace sta

#include <sta/utils/logger.tpp>

#endif // STA_UTILS_LOGGER_HPP