#pragma once

#include <functional>
#include <optional>
#include <string_view>

namespace BM700
{

/*  CONTROL PROTOCOL DEFINITIONS  */

// command: cmd-name[=arg1[,arg2[,...]]\n
static constexpr std::string_view CONTROL_PROTO_STOP_SEQ = "\n";
static constexpr std::string_view CONTROL_PROTO_COMM_ARG_DELIM_SEQ = "=";
static constexpr std::string_view CONTROL_PROTO_ARG_DELIM_SEQ = ",";

/*  CONTROL PROTOCOL COMMANDS  */

// coordinates getter/setter
static constexpr std::string_view CONTROL_PROTO_STR_TAG_AZ = "tagAZ";
static constexpr std::string_view CONTROL_PROTO_STR_TAG_ALT = "tagALT";
static constexpr std::string_view CONTROL_PROTO_STR_TAG_AZALT = "tagAZALT";
static constexpr std::string_view CONTROL_PROTO_STR_TAG_RA = "tagRA";
static constexpr std::string_view CONTROL_PROTO_STR_TAG_DEC = "tagDEC";
static constexpr std::string_view CONTROL_PROTO_STR_TAG_RADEC = "tagRADEC";
static constexpr std::string_view CONTROL_PROTO_STR_TEL_RA = "telRA";
static constexpr std::string_view CONTROL_PROTO_STR_TEL_DEC = "telDEC";
static constexpr std::string_view CONTROL_PROTO_STR_TEL_RADEC = "telRADEC";

// time/date
static constexpr std::string_view CONTROL_PROTO_STR_UTC_DATE = "utcDate";
static constexpr std::string_view CONTROL_PROTO_STR_LOC_DATE = "locDate";
static constexpr std::string_view CONTROL_PROTO_STR_UTC_TIME = "utcTime";
static constexpr std::string_view CONTROL_PROTO_STR_LOC_TIME = "locTime";
static constexpr std::string_view CONTROL_PROTO_STR_UTC_DT = "utcDT";  // full date-time
static constexpr std::string_view CONTROL_PROTO_STR_LOC_DT = "locDT";  // full date-time
static constexpr std::string_view CONTROL_PROTO_STR_JDN = "julDN";     // Julian day number

// target limits
static constexpr std::string_view CONTROL_PROTO_STR_TAG_MINALT = "tagMINALT";
static constexpr std::string_view CONTROL_PROTO_STR_TAG_MAXALT = "tagMAXALT";

// moving
static constexpr std::string_view CONTROL_PROTO_STR_SLEW_AZALT = "slewAZALT";
static constexpr std::string_view CONTROL_PROTO_STR_SLEW_RADEC = "slewRADEC";
static constexpr std::string_view CONTROL_PROTO_STR_SLEW_XVEL = "slewXVEL";  // velocity along Az/RA
static constexpr std::string_view CONTROL_PROTO_STR_SLEW_YVEL = "slewYVEL";  // velocity along ALT/DEC
static constexpr std::string_view CONTROL_PROTO_STR_TRACK_XVEL = "trackXVEL";
static constexpr std::string_view CONTROL_PROTO_STR_TRACK_YVEL = "trackYVEL";
static constexpr std::string_view CONTROL_PROTO_STR_STOP = "stop";

// site coordinates
static constexpr std::string_view CONTROL_PROTO_STR_SITE_LON = "siteLON";
static constexpr std::string_view CONTROL_PROTO_STR_SITE_LAT = "siteLAT";

static constexpr std::array CONTROL_PROTO_VALID_COMMAND = {CONTROL_PROTO_STR_SLEW_AZALT, CONTROL_PROTO_STR_SLEW_RADEC};

class ControlProtoParser
{
public:
    typedef std::function<void(std::string_view, std::vector<std::string_view>)> user_func_t;
    // typedef std::pair<std::string_view, std::vector<std::string_view>> parse_result_t;
    struct parse_result_t {
        std::string_view cmd;
        std::vector<std::string_view> args;
    };

    ControlProtoParser();

    virtual ~ControlProtoParser() = default;

    template <std::convertible_to<user_func_t> FT>
    bool addUserFunc(std::string_view command, FT&& func)
    {
        if (auto res = _userFunc.find(command); res != _userFunc.end()) {
            *res = std::forward<FT>(func);
            return true;
        } else {
            return false;
        }
    }

    std::optional<parse_result_t> parse(std::string_view command);
    bool exec(std::string_view command);

protected:
    static void generateCommMap();
    inline static std::unordered_map<std::string_view, user_func_t> _userFunc;
};


}  // namespace BM700