#ifndef __KABU_BLOCKALLOCATIONATABLE_HPP__
#define __KABU_BLOCKALLOCATIONATABLE_HPP__

#include "Constants.hpp"

namespace kabufuda
{
class BlockAllocationTable
{
    friend class Card;
#pragma pack(push, 4)
    union {
        struct
        {
            uint16_t m_checksum;
            uint16_t m_checksumInv;
            uint16_t m_updateCounter;
            uint16_t m_freeBlocks;
            uint16_t m_lastAllocated;
            uint16_t m_map[0xFFB];
        };
        uint8_t __raw[BlockSize];
    };
#pragma pack(pop)

    void swapEndian();
    void updateChecksum();
    bool valid() const;

public:
    explicit BlockAllocationTable(uint32_t blockCount = (uint32_t(ECardSize::Card2043Mb) * MbitToBlocks));
    BlockAllocationTable(uint8_t data[BlockSize]);
    ~BlockAllocationTable();

    uint16_t getNextBlock(uint16_t block) const;
    uint16_t nextFreeBlock(uint16_t maxBlock, uint16_t startingBlock) const;
    bool clear(uint16_t first, uint16_t count);
    uint16_t allocateBlocks(uint16_t count, uint16_t maxBlocks);
    uint16_t numFreeBlocks() const { return m_freeBlocks; }
};
}
#endif // __KABU_BLOCKALLOCATIONATABLE_HPP__