// See the file "COPYING" in the main distribution directory for copyright.

#include "zeek/script_opt/ZAM/BuiltInSupport.h"

#include "zeek/IPAddr.h"
#include "zeek/RE.h"

namespace zeek::detail {

FixedCatArg::FixedCatArg(TypePtr _t) : t(std::move(_t)) {
    switch ( t->Tag() ) {
        case TYPE_BOOL: max_size = 1; break;

        case TYPE_INT:
        case TYPE_COUNT:
            max_size = 20; // sufficient for 64 bits
            break;

        case TYPE_DOUBLE:
        case TYPE_TIME:
            max_size = 32; // from modp_dtoa2 documentation
            break;

        case TYPE_ENUM: {
            size_t n = 0;
            for ( const auto& e : t->AsEnumType()->Names() )
                n = std::max(n, e.first.size());
            max_size = n;
            break;
        }

        case TYPE_PORT:
            max_size = 5 + 1 + 7; // <number> + / + "unknown"
            break;

        case TYPE_ADDR:
            max_size = 39; // for IPv6
            break;

        case TYPE_SUBNET:
            max_size = 39 + 1 + 3; // for IPv6 + / + <3-digits>
            break;

        default: reporter->InternalError("bad type in FixedCatArg constructor");
    }
}

void FixedCatArg::RenderInto(const ZVal& z, char*& res) {
    int n;
    const char* text;
    std::string str;

    switch ( t->Tag() ) {
        case TYPE_BOOL: *(res++) = z.AsInt() ? 'T' : 'F'; break;

        case TYPE_INT:
            n = modp_litoa10(z.AsInt(), res);
            res += n;
            break;

        case TYPE_COUNT:
            n = modp_ulitoa10(z.AsCount(), res);
            res += n;
            break;

        case TYPE_DOUBLE:
        case TYPE_TIME: {
            auto d = z.AsDouble();
            n = modp_dtoa2(d, res, 6);
            res += n;

            if ( util::approx_equal(d, nearbyint(d), 1e-9) && std::isfinite(d) ) {
                // disambiguate from integer
                *(res++) = '.';
                *(res++) = '0';
            }
            break;
        }

        case TYPE_PATTERN:
            text = z.AsPattern()->AsPattern()->PatternText();
            *(res++) = '/';
            strcpy(res, text);
            res += strlen(text);
            *(res++) = '/';
            break;

        case TYPE_ENUM:
            text = t->AsEnumType()->Lookup(z.AsInt());
            strcpy(res, text);
            res += strlen(text);
            break;

        case TYPE_PORT: {
            uint32_t full_p = static_cast<uint32_t>(z.AsCount());
            zeek_uint_t p = full_p & ~PORT_SPACE_MASK;
            n = modp_ulitoa10(p, res);
            res += n;

            if ( (full_p & TCP_PORT_MASK) == TCP_PORT_MASK ) {
                strcpy(res, "/tcp");
                res += 4;
            }

            else if ( (full_p & UDP_PORT_MASK) == UDP_PORT_MASK ) {
                strcpy(res, "/udp");
                res += 4;
            }

            else if ( (full_p & ICMP_PORT_MASK) == ICMP_PORT_MASK ) {
                strcpy(res, "/icmp");
                res += 5;
            }

            else {
                strcpy(res, "/unknown");
                res += 8;
            }

            break;
        }

        case TYPE_ADDR:
            str = z.AsAddr()->Get().AsString();
            strcpy(res, str.c_str());
            res += strlen(str.c_str());
            break;

        case TYPE_SUBNET:
            str = z.AsSubNet()->Get().AsString();
            strcpy(res, str.c_str());
            res += strlen(str.c_str());
            break;

        default: reporter->InternalError("bad type in FixedCatArg::RenderInto");
    }
}

size_t PatternCatArg::ComputeMaxSize(const ZVal& zv) {
    text = zv.AsPattern()->AsPattern()->PatternText();
    n = strlen(text);
    return n;
}

} // namespace zeek::detail