use std::fmt;
use serde::{de, Deserialize, ser, Serialize};
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum InsulinDependentCode {
WidelyFluctuatingBloodSugars,
FrequentEpisodesOfInsulinReactions,
EvidenceOfFrequentSignificantKetosis,
PatientIsNotInsulinDependent,
}
impl InsulinDependentCode {
pub fn code(&self) -> &str {
{
use InsulinDependentCode::*;
match self {
WidelyFluctuatingBloodSugars => "1",
FrequentEpisodesOfInsulinReactions => "2",
EvidenceOfFrequentSignificantKetosis => "3",
PatientIsNotInsulinDependent => "N",
}
}
}
pub fn from_code(code: &[u8]) -> Option<InsulinDependentCode> {
use InsulinDependentCode::*;
match code {
b"1" => Some(WidelyFluctuatingBloodSugars),
b"2" => Some(FrequentEpisodesOfInsulinReactions),
b"3" => Some(EvidenceOfFrequentSignificantKetosis),
b"N" => Some(PatientIsNotInsulinDependent),
_ => None,
}
}
fn description(&self) -> &str {
use InsulinDependentCode::*;
match self {
WidelyFluctuatingBloodSugars => "Widely fluctuating blood sugars",
FrequentEpisodesOfInsulinReactions => {
"Frequent episodes of insulin reactions"
}
EvidenceOfFrequentSignificantKetosis => {
"Evidence of frequent significant ketosis"
}
PatientIsNotInsulinDependent => "Patient is not insulin dependent",
}
}
fn from_description(description: &str) -> Option<InsulinDependentCode> {
{
use InsulinDependentCode::*;
match description {
"Widely fluctuating blood sugars" => Some(WidelyFluctuatingBloodSugars),
"Frequent episodes of insulin reactions" => {
Some(FrequentEpisodesOfInsulinReactions)
}
"Evidence of frequent significant ketosis" => {
Some(EvidenceOfFrequentSignificantKetosis)
}
"Patient is not insulin dependent" => Some(PatientIsNotInsulinDependent),
_ => None,
}
}
}
}
impl Serialize for InsulinDependentCode {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: ser::Serializer,
{
let value = if serializer.is_human_readable() {
self.description()
} else {
self.code()
};
serializer.serialize_str(value)
}
}
struct Visitor;
impl<'de> de::Visitor<'de> for Visitor {
type Value = InsulinDependentCode;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str("Insulin Dependent Code")
}
fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>
where
E: de::Error,
{
InsulinDependentCode::from_description(v)
.ok_or_else(|| E::custom(format!("Invalid Insulin Dependent Code: {}", v)))
}
fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>
where
E: de::Error,
{
InsulinDependentCode::from_code(v)
.ok_or_else(|| E::custom(
format!(
"Invalid Insulin Dependent Code: {}", std::str::from_utf8(v).unwrap()
),
))
}
}
impl<'de> Deserialize<'de> for InsulinDependentCode {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: de::Deserializer<'de>,
{
if deserializer.is_human_readable() {
deserializer.deserialize_str(Visitor)
} else {
deserializer.deserialize_bytes(Visitor)
}
}
}