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#ifndef DBALLE_AOF_CODEC_H
#define DBALLE_AOF_CODEC_H

/** @file
 * @ingroup aof
 *
 * AOF message codec.
 *
 * It provides various AOF encoding and decoding functions, and implements
 * dba_file reading and writing of AOF files.
 *
 * AOF records can be read, written and interpreted into a dba_msg.  Encoding
 * from a dba_msg is not yet implemented.  A "makeaof" tool exists, not part of
 * DB-All.e, that can convert BUFR messages into AOF.
 *
 * Endianness of the written records can be controlled by the environment
 * variable DBA_AOF_ENDIANNESS:
 *
 * \li \b ARCH writes using the host endianness
 * \li \n LE writes using little endian
 * \li \n BE writes using big endian
 *
 * If the environment variable is not set, the default is to write using the
 * host endianness.
 */

#include <dballe/msg/codec.h>
#include <stdint.h>

namespace dballe {
struct Msg;

namespace msg {

class AOFImporter : public Importer
{
protected:
    // Message-specific code
    static void read_synop(const uint32_t* obs, int obs_len, Msg& msg);
    static void read_flight(const uint32_t* obs, int obs_len, Msg& msg);
    static void read_satob(const uint32_t* obs, int obs_len, Msg& msg);
    static void read_dribu(const uint32_t* obs, int obs_len, Msg& msg);
    static void read_temp(const uint32_t* obs, int obs_len, Msg& msg);
    static void read_pilot(const uint32_t* obs, int obs_len, Msg& msg);
    static void read_satem(const uint32_t* obs, int obs_len, Msg& msg);

    /// Parse WMO block and station numbers in the Observation Header
    static void parse_st_block_station(const uint32_t* obs, Msg& msg);
    /// Parse station altitude the Observation Header
    static void parse_altitude(const uint32_t* obs, Msg& msg);
    /// Parse string ident in the Observation Header
    static void parse_st_ident(const uint32_t* obs, Msg& msg);
    /**
     * Parse latitude, longitude, date and time in the Observation Header
     *
     * @returns the hour, which can be used to take decisions later
     */
    static int parse_lat_lon_datetime(const uint32_t* obs, Msg& msg);
    /// Parse 27 Weather group in Synop observations
    static void parse_weather_group(const uint32_t* obs, Msg& msg, int hour);
    /// Parse 28 General cloud group in Synop observations
    static void parse_general_cloud_group(const uint32_t* obs, Msg& msg);
    /// Parse a bit-packed cloud group in Synop observations
    static void parse_cloud_group(uint32_t val, int* ns, int* c, int* h);


public:
    AOFImporter(const Options& opts=Options());
    virtual ~AOFImporter();

    bool foreach_decoded(const BinaryMessage& msg, std::function<bool(std::unique_ptr<Message>&&)> dest) const override;

    Messages from_bulletin(const wreport::Bulletin& msg) const override;

    /**
     * Get category and subcategory of an AOF message
     *
     * @param msg
     *   The message to scan
     * @retval category
     *   The AOF category of the message
     * @retval subcategory
     *   The AOF subcategory of the message
     */
    static void get_category(const BinaryMessage& msg, int* category, int* subcategory);

    /**
     * Print the contents of the AOF message
     *
     * @param msg
     *   The encoded message to dump
     * @param out
     *   The stream to use to print the message
     */
    static void dump(const BinaryMessage& msg, FILE* out);
};

} // namespace msg
} // namespace dballe

/* vim:set ts=4 sw=4: */
#endif