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// rocie - An enterprise grocery management system
//
// Copyright (C) 2026 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This file is part of Rocie.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.
use std::str::FromStr;
use serde::{Deserialize, Serialize};
use sqlx::query;
use uuid::Uuid;
use crate::{
app::App,
storage::{
migrate::get_current_date,
sql::{
barcode::{Barcode, BarcodeId},
insert::{Operations, Transactionable},
unit::{Unit, UnitAmount},
},
},
};
#[derive(Debug, Deserialize, Serialize)]
pub(crate) enum Operation {
Buy {
buy_id: Uuid,
id: BarcodeId,
},
Consume {
buy_id: Uuid,
id: BarcodeId,
amount: UnitAmount,
},
}
impl Transactionable for Operation {
type ApplyError = apply::Error;
type UndoError = undo::Error;
async fn apply(self, txn: &mut sqlx::SqliteConnection) -> Result<(), apply::Error> {
match self {
Operation::Buy { buy_id, id } => {
let id = id.to_db();
let buy_id = buy_id.to_string();
let timestamp = get_current_date();
query!(
"
INSERT INTO buys (buy_id, barcode_id, timestamp)
VALUES (?, ?, ?)
",
buy_id,
id,
timestamp,
)
.execute(txn)
.await?;
}
Operation::Consume { buy_id, id, amount } => {
let id = id.to_db();
let buy_id = buy_id.to_string();
let old_amount = {
let record = query!(
"
SELECT used_amount
FROM buys
WHERE buy_id = ?;
",
buy_id
)
.fetch_one(&mut *txn)
.await?;
u32::try_from(record.used_amount.unwrap_or(0))
.expect("Should be strictly positive")
};
// TODO: Check, that this does not overflow the maximum amount. <2025-09-21>
let new_amount = amount.value + old_amount;
// TODO(@bpeetz): We need to add the amount. <2025-09-09>
query!(
"
UPDATE buys
SET used_amount = ?
WHERE barcode_id = ? AND buy_id = ?
",
new_amount,
id,
buy_id
)
.execute(txn)
.await?;
}
}
Ok(())
}
async fn undo(self, txn: &mut sqlx::SqliteConnection) -> Result<(), undo::Error> {
match self {
Operation::Buy { buy_id, id } => {
let id = id.to_db();
let buy_id = buy_id.to_string();
query!(
"
DELETE FROM buys
WHERE barcode_id = ? AND buy_id = ?
",
id,
buy_id
)
.execute(txn)
.await?;
}
Operation::Consume { buy_id, id, amount } => {
todo!("We would need to subtract the amount.");
}
}
Ok(())
}
}
pub(crate) mod undo {
#[derive(thiserror::Error, Debug)]
pub(crate) enum Error {
#[error("Failed to execute undo sql statments: {0}")]
SqlError(#[from] sqlx::Error),
}
}
pub(crate) mod apply {
#[derive(thiserror::Error, Debug)]
pub(crate) enum Error {
#[error("Failed to execute apply sql statments: {0}")]
SqlError(#[from] sqlx::Error),
}
}
impl Barcode {
pub(crate) fn buy(&self, ops: &mut Operations<Operation>) {
let id = Uuid::new_v4();
ops.push(Operation::Buy {
buy_id: id,
id: self.id,
});
}
pub(crate) async fn consume(
&self,
app: &App,
amount: UnitAmount,
ops: &mut Operations<Operation>,
) -> Result<(), consume::Error> {
assert_eq!(
self.amount.unit, amount.unit,
"We currently do not support unit conversions yet"
);
if amount.value > self.amount.value {
let foreign_amount_unit = Unit::from_id(app, amount.unit).await?;
if let Some(foreign_amount_unit) = foreign_amount_unit {
let self_amount_unit = Unit::from_id(app, self.amount.unit)
.await?
.expect("This unit id should always exist");
return Err(consume::Error::ConsumedMoreThanAvailable {
consumed: Box::new((amount, foreign_amount_unit)),
available: Box::new((self.amount, self_amount_unit)),
});
}
return Err(consume::Error::UnitIdDoesNotExist(amount.unit));
}
let barcode_id = self.id.to_db();
let buy_id = {
let record = query!(
"
SELECT buy_id
FROM buys
WHERE barcode_id = ? AND (used_amount IS NULL OR used_amount < ?)
ORDER BY timestamp DESC
LIMIT 1;
",
barcode_id,
self.amount.value
)
.fetch_optional(&app.db)
.await?;
if let Some(found) = record {
Uuid::from_str(&found.buy_id).expect("Was a uuid, should still be one")
} else {
return Err(consume::Error::NoMoreAvailable);
}
};
ops.push(Operation::Consume {
id: self.id,
amount,
buy_id,
});
Ok(())
}
}
pub(crate) mod consume {
use actix_web::ResponseError;
use crate::storage::{
self,
sql::unit::{Unit, UnitAmount, UnitId},
};
#[derive(thiserror::Error, Debug)]
pub(crate) enum Error {
#[error("Failed to execute apply sql statments: {0}")]
Sql(#[from] sqlx::Error),
#[error("Failed to fetch an unit from a specified amount id value")]
UnitGet(#[from] storage::sql::get::unit::from_id::Error),
#[error("The specified unit-id does not exist: {0}")]
UnitIdDoesNotExist(UnitId),
#[error("No more of this product is available, buy more. ")]
NoMoreAvailable,
#[error(
"Consumed more than available: consumed {} {}, but available: {} {}", consumed.0.value, consumed.1.short_name, available.0.value, available.1.short_name,
)]
ConsumedMoreThanAvailable {
consumed: Box<(UnitAmount, Unit)>,
available: Box<(UnitAmount, Unit)>,
},
}
impl ResponseError for Error {}
}
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