poot 0.1.1

API wrapper for Photop.
Documentation 
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use std::hash::{Hash, Hasher};

use serde::{Deserialize, Serialize};

use super::{group::Group, post::Post, user::User};

pub fn date_from_u64(id: u128) -> chrono::DateTime<chrono::Utc> {
    let time = id >> 8;
    return chrono::DateTime::<chrono::Utc>::from_utc(
        chrono::NaiveDateTime::from_timestamp(time as i64, 0),
        chrono::Utc,
    );
}

#[derive(Deserialize, Serialize, Debug)]
pub struct Id<T> {
    phantom: std::marker::PhantomData<T>,
    #[serde(with = "hex_id")]
    id: u128,
}

impl<T> Hash for Id<T> {
    fn hash<H: Hasher>(&self, state: &mut H) {
        self.id.hash(state);
    }
}

impl<T> Eq for Id<T> {}

impl<T> PartialEq for Id<T> {
    fn eq(&self, other: &Self) -> bool {
        self.id == other.id
    }
}

impl<T> Clone for Id<T> {
    fn clone(&self) -> Self {
        Id {
            phantom: std::marker::PhantomData,
            id: self.id,
        }
    }
}

impl<T> Id<T> {
    pub fn get_date(&self) -> chrono::DateTime<chrono::Utc> {
        date_from_u64(self.id)
    }
    pub fn to_string(&self) -> String {
        format!("{:12x}", self.id)
    }
}

impl<T> From<&str> for Id<T> {
    fn from(id: &str) -> Self {
        Id {
            phantom: std::marker::PhantomData,
            id: u128::from_str_radix(id, 16).unwrap(),
        }
    }
}

pub type UserId = Id<User>;
pub type GroupId = Id<Group>;
pub type PostId = Id<Post>;

pub mod hex_id {
    use serde::de::Visitor;
    use serde::Deserializer;
    use serde::Serializer;

    pub fn serialize<S>(val: &u128, s: S) -> Result<S::Ok, S::Error>
    where
        S: Serializer,
    {
        s.serialize_str(&format!("{:12x}", val))
    }

    pub fn deserialize<'de, D>(deserializer: D) -> Result<u128, D::Error>
    where
        D: Deserializer<'de>,
    {
        struct HexVisitor;
        impl<'de> Visitor<'de> for HexVisitor {
            type Value = u128;
            fn visit_str<E: serde::de::Error>(self, s: &str) -> Result<u128, E> {
                println!("{}", s);
                u128::from_str_radix(s, 16).map_err(|_| serde::de::Error::custom("Failed to parse"))
            }

            fn expecting(&self, formatter: &mut std::fmt::Formatter) -> std::fmt::Result {
                formatter.write_str("a hex string")
            }
        }

        deserializer.deserialize_str(HexVisitor)
    }
}