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use chrono::naive::NaiveDate;
use rust_decimal::Decimal;
use serde::{Deserialize, Serialize};
use std::convert::AsRef;
use std::fmt;
use std::fs;
use std::hash::{Hash, Hasher};
use std::path::Path;
use structopt::StructOpt;
use tabled::Tabled;
use twox_hash::XxHash64;
pub(crate) type Account = String;
pub(crate) type Category = String;
#[derive(Debug)]
#[derive(Hash)]
#[derive(Deserialize, Serialize)]
#[derive(StructOpt)]
pub enum TransactionKind {
Expense,
Income,
//TODO Transfer,
}
impl std::str::FromStr for TransactionKind {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
match s {
"expense" => Ok(TransactionKind::Expense),
"income" => Ok(TransactionKind::Income),
_ => Err(format!("Unknown transaction kind: {:?}", s)),
}
}
}
impl fmt::Display for TransactionKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
match self {
TransactionKind::Expense => write!(f, "expense"),
TransactionKind::Income => write!(f, "income"),
}
}
}
#[derive(Debug)]
#[derive(Hash)]
#[derive(Deserialize, Serialize)]
#[derive(Tabled)]
pub struct Transaction {
pub description: String,
pub date: NaiveDate,
pub category: Category,
pub amount: Decimal,
pub kind: TransactionKind,
pub from: Account,
pub to: Account,
}
impl Transaction {
pub(crate) fn write<P: AsRef<Path>>(&self, p: &P) -> std::io::Result<()> {
fs::write(p, serde_json::to_string_pretty(self).unwrap()) //TODO control pretty or not
}
//TODO Result
pub(crate) fn open<P: AsRef<Path>>(p: &P) -> Option<Self> {
fs::read_to_string(p)
.ok()
.as_ref()
.and_then(|s| serde_json::from_str(s).ok())
}
pub fn id(&self) -> u64 {
let mut h = XxHash64::default();
self.hash(&mut h);
h.finish()
}
}
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