/*
    TessesFramework a library to make C++ easier for me, used in CrossLang:
   https://git.tesses.org/tesses50/crosslang Copyright (C) 2026 Mike Nolan

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

#include "TessesFramework/Uuid.hpp"
#include "TessesFramework/Crypto/Crypto.hpp"
#include "TessesFramework/Http/HttpUtils.hpp"

namespace Tesses::Framework {
Uuid Uuid::Generate() {
    // xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
    Uuid uuid;
    Uuid::Generate(uuid);
    return uuid;
}

void Uuid::Generate(Uuid &uuid) {
    std::vector<uint8_t> bytes(16);
    Crypto::RandomBytes(bytes, "TF_UUID");

    uuid.time_low = (uint32_t)bytes[0];
    uuid.time_low |= (uint32_t)bytes[1] << 8;
    uuid.time_low |= (uint32_t)bytes[2] << 16;
    uuid.time_low |= (uint32_t)bytes[3] << 24;
    uuid.time_mid = (uint16_t)bytes[4];
    uuid.time_mid |= (uint16_t)bytes[5] << 8;
    uuid.time_hi_and_version = (uint16_t)bytes[6];
    uuid.time_hi_and_version |= (uint16_t)bytes[7] << 8;
    uuid.clock_seq_hi_and_reserved = bytes[8];
    uuid.clock_seq_low = bytes[9];
    for (size_t i = 0; i < 6; i++) {
        uuid.node[i] = bytes[i + 10];
    }
    uuid.time_hi_and_version &= ~0x00F0;
    uuid.time_hi_and_version |= 0x0040;
    uuid.clock_seq_hi_and_reserved &= ~0b11000000;
    uuid.clock_seq_hi_and_reserved |= 0b10000000;
}

bool Uuid::TryParse(std::string text, Uuid &uuid) {
    std::array<uint8_t, 32> hex_digits;
    size_t hex_offset = 0;
    size_t text_offset = 0;
    for (; text_offset < text.size(); text_offset++) {
        if (text[text_offset] == '{' && (text_offset != 0 || hex_offset != 0))
            return false;
        if (text[text_offset] == '}' && hex_offset < 32)
            return false;
        if (text[text_offset] == '-' && hex_offset != 8 && hex_offset != 12 &&
            hex_offset != 16 && hex_offset != 20)
            return false;
        if ((text[text_offset] >= 'A' && text[text_offset] <= 'F') ||
            (text[text_offset] >= 'a' && text[text_offset] <= 'f') ||
            text[text_offset] >= '0' && text[text_offset] <= '9') {
            if (hex_offset >= 32)
                return false;
            hex_digits[hex_offset] =
                Http::HttpUtils::HexToNibble(text[text_offset]);
            hex_offset++;
        } else
            return false;
    }

    uint8_t b = hex_digits[0] << 4 | hex_digits[1];
    uuid.time_low = (uint32_t)b;
    b = hex_digits[2] << 4 | hex_digits[3];
    uuid.time_low |= (uint32_t)b << 8;
    b = hex_digits[4] << 4 | hex_digits[5];
    uuid.time_low |= (uint32_t)b << 16;
    b = hex_digits[6] << 4 | hex_digits[7];
    uuid.time_low |= (uint32_t)b << 24;

    b = hex_digits[8] << 4 | hex_digits[9];
    uuid.time_mid = (uint16_t)b;
    b = hex_digits[10] << 4 | hex_digits[11];
    uuid.time_mid |= (uint16_t)b << 8;

    b = hex_digits[12] << 4 | hex_digits[13];
    uuid.time_hi_and_version = (uint16_t)b;
    b = hex_digits[14] << 4 | hex_digits[15];
    uuid.time_hi_and_version |= (uint16_t)b << 8;

    uuid.clock_seq_hi_and_reserved = hex_digits[16] << 4 | hex_digits[17];

    uuid.clock_seq_low = hex_digits[18] << 4 | hex_digits[19];

    for (size_t i = 0; i < 6; i++) {
        uuid.node[i] = hex_digits[20 + (i * 2)] << 4 | hex_digits[21 + (i * 2)];
    }

    return true;
}
// 9c4994e7-3c82-4c30-a459-8fdcd960b4ac

std::string Uuid::ToString(UuidStringifyConfig cfg) const {
    bool hasCurly = ((int)cfg & (int)UuidStringifyConfig::HasCurly) != 0;
    bool isUppercase = ((int)cfg & (int)UuidStringifyConfig::IsUppercase) != 0;
    bool hasDash = ((int)cfg & (int)UuidStringifyConfig::HasDashes) != 0;

    std::string uuid_str = "";
    if (hasCurly)
        uuid_str += "{";

    uint8_t byte = (uint8_t)(this->time_low & 0xFF);

    uuid_str += Http::HttpUtils::NibbleToHex(byte >> 4, isUppercase);
    uuid_str += Http::HttpUtils::NibbleToHex(byte, isUppercase);
    byte = (uint8_t)((this->time_low >> 8) & 0xFF);
    uuid_str += Http::HttpUtils::NibbleToHex(byte >> 4, isUppercase);
    uuid_str += Http::HttpUtils::NibbleToHex(byte, isUppercase);
    byte = (uint8_t)((this->time_low >> 16) & 0xFF);
    uuid_str += Http::HttpUtils::NibbleToHex(byte >> 4, isUppercase);
    uuid_str += Http::HttpUtils::NibbleToHex(byte, isUppercase);
    byte = (uint8_t)((this->time_low >> 24) & 0xFF);
    uuid_str += Http::HttpUtils::NibbleToHex(byte >> 4, isUppercase);
    uuid_str += Http::HttpUtils::NibbleToHex(byte, isUppercase);

    if (hasDash)
        uuid_str += "-";

    byte = (uint8_t)(this->time_mid & 0xFF);

    uuid_str += Http::HttpUtils::NibbleToHex(byte >> 4, isUppercase);
    uuid_str += Http::HttpUtils::NibbleToHex(byte, isUppercase);

    byte = (uint8_t)((this->time_mid >> 8) & 0xFF);

    uuid_str += Http::HttpUtils::NibbleToHex(byte >> 4, isUppercase);
    uuid_str += Http::HttpUtils::NibbleToHex(byte, isUppercase);

    if (hasDash)
        uuid_str += "-";

    byte = (uint8_t)(this->time_hi_and_version & 0xFF);

    uuid_str += Http::HttpUtils::NibbleToHex(byte >> 4, isUppercase);
    uuid_str += Http::HttpUtils::NibbleToHex(byte, isUppercase);

    byte = (uint8_t)((this->time_hi_and_version >> 8) & 0xFF);

    uuid_str += Http::HttpUtils::NibbleToHex(byte >> 4, isUppercase);
    uuid_str += Http::HttpUtils::NibbleToHex(byte, isUppercase);
    if (hasDash)
        uuid_str += "-";

    uuid_str += Http::HttpUtils::NibbleToHex(
        this->clock_seq_hi_and_reserved >> 4, isUppercase);
    uuid_str += Http::HttpUtils::NibbleToHex(this->clock_seq_hi_and_reserved,
                                             isUppercase);
    uuid_str +=
        Http::HttpUtils::NibbleToHex(this->clock_seq_low >> 4, isUppercase);
    uuid_str += Http::HttpUtils::NibbleToHex(this->clock_seq_low, isUppercase);
    if (hasDash)
        uuid_str += "-";

    for (size_t i = 0; i < 6; i++) {
        byte = this->node[i];
        uuid_str += Http::HttpUtils::NibbleToHex(byte >> 4, isUppercase);
        uuid_str += Http::HttpUtils::NibbleToHex(byte, isUppercase);
    }

    if (hasCurly)
        uuid_str += "}";
    return uuid_str;
}

bool Uuid::IsEmpty() const {
    return this->time_low == 0 && this->time_mid == 0 &&
           this->time_hi_and_version == 0 &&
           this->clock_seq_hi_and_reserved == 0 && this->clock_seq_low == 0 &&
           this->node[0] == 0 && this->node[1] == 0 && this->node[2] == 0 &&
           this->node[3] == 0 && this->node[4] == 0 && this->node[5] == 0;
}

bool operator==(const Uuid &left, const Uuid &right) {
    return left.time_low == right.time_low && left.time_mid == right.time_mid &&
           left.time_hi_and_version == right.time_hi_and_version &&
           left.clock_seq_hi_and_reserved == right.clock_seq_hi_and_reserved &&
           left.clock_seq_low == right.clock_seq_low &&
           left.node[0] == right.node[0] && left.node[1] == right.node[1] &&
           left.node[2] == right.node[2] && left.node[3] == right.node[3] &&
           left.node[4] == right.node[4] && left.node[5] == right.node[5];
}
bool operator!=(const Uuid &left, const Uuid &right) {
    return left.time_low != right.time_low && left.time_mid != right.time_mid &&
           left.time_hi_and_version != right.time_hi_and_version &&
           left.clock_seq_hi_and_reserved != right.clock_seq_hi_and_reserved &&
           left.clock_seq_low != right.clock_seq_low &&
           left.node[0] != right.node[0] && left.node[1] != right.node[1] &&
           left.node[2] != right.node[2] && left.node[3] != right.node[3] &&
           left.node[4] != right.node[4] && left.node[5] != right.node[5];
}
} // namespace Tesses::Framework