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/* graph_model_weight.rs
*
* Copyright 2020-2021 Rasmus Thomsen <oss@cogitri.dev>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
use crate::{
core::{Database, Settings, UnitSystem},
model::weight::Weight,
prelude::*,
views::Point,
};
use anyhow::Result;
use std::collections::BTreeMap;
use uom::si::{
f32::Mass,
mass::{kilogram, pound},
};
/// A [GraphModelWeight] manages weight data for easy consumption in views.
#[derive(Debug, Default)]
pub struct GraphModelWeight {
database: Database,
settings: Settings,
vec: Vec<Weight>,
}
impl GraphModelWeight {
pub fn new() -> Self {
Self {
database: Database::instance(),
settings: Settings::instance(),
vec: Vec::new(),
}
}
#[cfg(test)]
pub fn new_with_database(database: Database) -> Self {
Self {
database,
settings: Settings::instance(),
vec: Vec::new(),
}
}
/// Reload the data from the Tracker Database.
///
/// # Arguments
/// * `duration` - How far in the past the data should reach back.
///
/// # Returns
/// Returns an error if querying the DB fails.
pub async fn reload(&mut self, duration: glib::TimeSpan) -> Result<()> {
self.vec = self
.database
.weights(Some(glib::DateTime::local().subtract(duration)))
.await?;
Ok(())
}
/// Converts the model's data to an array of [Point](crate::views::Point) so it can be displayed in a [GraphView](crate::views::GraphView).
pub fn to_points(&self) -> Vec<crate::views::Point> {
let map = self
.vec
.iter()
.map(|w| {
let val = if self.settings.unit_system() == UnitSystem::Metric {
w.weight.get::<kilogram>()
} else {
w.weight.get::<pound>()
};
(w.date.clone(), val)
})
.collect::<BTreeMap<_, _>>();
map.into_iter()
.map(|(date, value)| Point { date, value })
.collect()
}
/// Get if the model is empty.
pub fn is_empty(&self) -> bool {
self.vec.is_empty()
}
/// Get the last weight the user added.
pub fn last_weight(&self) -> Option<Mass> {
self.vec.last().map(|w| w.weight)
}
pub fn penultimate_weight(&self) -> Option<Mass> {
if self.vec.len() == 1 {
self.last_weight()
} else {
Some(self.vec[self.vec.len() - 2].weight)
}
}
}
#[cfg(test)]
mod test {
use super::GraphModelWeight;
use crate::{core::Database, model::Weight, prelude::*, views::Point};
use gtk::glib;
use tempfile::tempdir;
use uom::si::{f32::Mass, mass::kilogram};
#[test]
fn to_points() {
let ctx = glib::MainContext::new();
ctx.with_thread_default(|| {
let data_dir = tempdir().unwrap();
let db = Database::new_with_store_path(data_dir.path().into()).unwrap();
let mut model = GraphModelWeight::new_with_database(db.clone());
ctx.block_on(model.reload(glib::TimeSpan::from_days(1)))
.unwrap();
assert_eq!(model.to_points(), vec![]);
let date = glib::DateTime::local();
let weight = Weight::new(date.clone(), Mass::new::<kilogram>(42.0));
ctx.block_on(db.save_weight(weight)).unwrap();
ctx.block_on(model.reload(glib::TimeSpan::from_days(1)))
.unwrap();
assert_eq!(
model.to_points(),
vec![Point {
date: date.clone(),
value: 42.0,
}]
);
let weight = Weight::new(
date.clone().add_days(-1).unwrap(),
Mass::new::<kilogram>(43.0),
);
ctx.block_on(db.save_weight(weight)).unwrap();
// 5 second buffer since it might take a second or two to save the weight
ctx.block_on(model.reload(glib::TimeSpan::from_seconds(3600 * 24 + 5)))
.unwrap();
assert_eq!(
model.to_points(),
vec![
Point {
date: date.clone().add_days(-1).unwrap(),
value: 43.0,
},
Point {
date: date.clone(),
value: 42.0,
}
]
);
let weight = Weight::new(date.clone(), Mass::new::<kilogram>(43.0));
ctx.block_on(db.save_weight(weight)).unwrap();
// 5 second buffer since it might take a second or two to save the weight
ctx.block_on(model.reload(glib::TimeSpan::from_seconds(3600 * 24 + 5)))
.unwrap();
assert_eq!(
model.to_points(),
vec![
Point {
date: date.clone().add_days(-1).unwrap(),
value: 43.0,
},
Point { date, value: 43.0 }
]
);
})
.unwrap();
}
}