#include <cstdio>
#include <cstring>
#include "md5.h"
#include "esphome/core/helpers.h"

namespace esphome {
namespace md5 {

void MD5Digest::init() {
  memset(this->digest_, 0, 16);
  MD5Init(&this->ctx_);
}

void MD5Digest::add(const uint8_t *data, size_t len) { MD5Update(&this->ctx_, data, len); }

void MD5Digest::calculate() { MD5Final(this->digest_, &this->ctx_); }

void MD5Digest::get_bytes(uint8_t *output) { memcpy(output, this->digest_, 16); }

void MD5Digest::get_hex(char *output) {
  for (size_t i = 0; i < 16; i++) {
    sprintf(output + i * 2, "%02x", this->digest_[i]);
  }
}

bool MD5Digest::equals_bytes(const char *expected) {
  for (size_t i = 0; i < 16; i++) {
    if (expected[i] != this->digest_[i]) {
      return false;
    }
  }
  return true;
}

bool MD5Digest::equals_hex(const char *expected) {
  for (size_t i = 0; i < 16; i++) {
    auto high = parse_hex(expected[i * 2]);
    auto low = parse_hex(expected[i * 2 + 1]);
    if (!high.has_value() || !low.has_value()) {
      return false;
    }
    auto value = (*high << 4) | *low;
    if (value != this->digest_[i]) {
      return false;
    }
  }
  return true;
}

}  // namespace md5
}  // namespace esphome