jap_learn/src/data.rs

pub mod entities;
pub mod repositories;

use rusqlite::ToSql;
use rusqlite::types::{FromSql, FromSqlError, FromSqlResult, ToSqlOutput, ValueRef};
use std::fmt::{Display, Formatter, write};
use std::num::ParseIntError;
use std::str::FromStr;

macro_rules! id_impl {
    ($id_type:ty, $name:ident, $invalid:ident) => {
        #[derive(Clone, PartialEq, Eq, Debug, Hash, Copy, Ord, PartialOrd, Default)]
        pub struct $name(pub(crate) $id_type);
        pub const $invalid: $name = $name(0);
        impl FromStr for $name {
            type Err = ParseIntError;

            fn from_str(s: &str) -> Result<Self, Self::Err> {
                Ok($name(s.parse::<$id_type>()?))
            }
        }

        impl From<$id_type> for $name {
            fn from(value: $id_type) -> Self {
                $name(value)
            }
        }

        impl From<$name> for $id_type {
            fn from(value: $name) -> Self {
                value.0
            }
        }
        impl Display for $name {
            fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
                write!(f, "{}", self.0)
            }
        }

        impl FromSql for $name {
            fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self> {
                match value {
                    ValueRef::Integer(i) => Ok($name(i as $id_type)),
                    _ => Err(FromSqlError::InvalidType),
                }
            }
        }

        impl ToSql for $name {
            fn to_sql(&self) -> rusqlite::Result<ToSqlOutput<'_>> {
                Ok(ToSqlOutput::from(self.0 as i64))
            }
        }

        impl From<$name> for String {
            fn from(value: $name) -> Self {
                value.0.to_string()
            }
        }

        impl $name {
            pub(crate) fn is_valid(self) -> bool {
                self.0 != 0
            }
        }
    };
}

id_impl!(u32, Id, INVALID_ID);
id_impl!(u16, SmallId, INVALID_SMALL_ID);

impl From<SmallId> for Id {
    fn from(value: SmallId) -> Self {
        Self(value.0 as u32)
    }
}

impl From<Id> for SmallId {
    fn from(value: Id) -> Self {
        Self(value.0 as u16)
    }
}