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use serde::{Deserialize, Serialize};
use std::fs::File;
use std::io::Read;
use std::path::PathBuf;
use std::time::{SystemTime, UNIX_EPOCH};
use time::{format_description::well_known::Rfc2822, OffsetDateTime};
#[derive(Serialize, Deserialize)]
pub struct Metadata {
pub id: String,
#[serde(alias = "createdOn")]
pub created_on: u64,
}
impl Metadata {
pub fn read_or_create(file_path: &PathBuf) -> Metadata {
if let Some(metadata) = Metadata::read_metadata_file(file_path) {
metadata
} else {
let timestamp = SystemTime::now().duration_since(UNIX_EPOCH).map_or_else(
|_| 0,
|duration| u64::try_from(duration.as_millis()).expect("Timestamp is too big!"),
);
Metadata {
id: timestamp.to_string(),
created_on: timestamp,
}
}
}
pub fn created_on_utc(&self) -> Option<String> {
let date =
OffsetDateTime::from_unix_timestamp_nanos((self.created_on * 1_000_000).into()).ok()?;
date.format(&Rfc2822).ok()
}
fn read_metadata_file(file_path: &PathBuf) -> Option<Metadata> {
let mut file = File::open(file_path).ok()?;
let mut contents = String::new();
file.read_to_string(&mut contents).ok()?;
serde_json::from_str(&contents).ok()
}
}
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