/**
 * mining_work.hpp
 */

#include "nlohmann/json.hpp"
#include "bitcoin_block_header.hpp"

#ifndef EE382N_BITCOIN_MINING_WORK_HPP
#define EE382N_BITCOIN_MINING_WORK_HPP

using json = nlohmann::json;

namespace stratum_v1 {

class MiningWork {
public:
    MiningWork(json &params, const std::string& xnonce1, size_t xnonce2_size);

    std::string generate_coinbase();
    void increment_xnonce2();
    std::string generate_merkle_root();
//    std::string generate_block_header(uint32_t nonce);
//    void generate_block_header(uint8_t header[80], uint32_t nonce);
    BitcoinBlockHeader generate_header_template();

    bool get_clean_jobs() const;
    std::string get_job_id() const;
    std::string get_prev_hash() const;
    std::string get_version() const;
    std::string get_nbits() const;
    std::string get_ntime() const;
    std::string get_xnonce2() const;

    static void hex2bin(const std::string &hex_str, uint8_t *out);
    static uint32_t hex2bin32(const std::string& hex);
    static std::string bin2hex(const uint8_t *bin, size_t len);

private:
    // Inputs from mining.notify
    std::string _job_id;
    std::string _prev_hash;
    std::string _coin_base1;
    std::string _coin_base2;
    std::vector<std::string> _merkle_branch;
    std::string _version;
    std::string _nbits;
    std::string _ntime;
    bool _clean_jobs;
    // Session context from mining.subscribe response
    std::string _xnonce1;
    size_t _xnonce1_size;
    size_t _xnonce2_size;
    // Extra nonce field to increment if we try all nonce * version hashes
    std::vector<uint8_t> _xnonce2;
};

} // namespace stratum_v1

#endif //EE382N_BITCOIN_MINING_WORK_HPP