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|
use anyhow::Result;
use rusqlite::{named_params, Connection};
use crate::model::DbEntry;
use crate::util::time;
use crate::{
model::{Card, Question},
space_repetition,
util::serialization,
};
pub fn all(conn: &Connection) -> Result<Vec<DbEntry>> {
let query = r#"SELECT question, responses, deleted FROM cards"#;
let mut stmt = conn.prepare(query)?;
let res: Result<Vec<DbEntry>, rusqlite::Error> = stmt
.query_map([], |row| {
let responses: String = row.get(1)?;
Ok(DbEntry {
question: row.get(0)?,
responses: serialization::line_to_words(&responses),
deleted: row.get(2)?,
})
})?
.collect();
Ok(res?)
}
pub fn insert(conn: &mut Connection, questions: &Vec<Question>) -> Result<()> {
let query = r#"
INSERT INTO cards (question, responses, state, created, ready)
VALUES (:question, :responses, :state, :created, :ready)
"#;
let now = time::seconds_since_unix_epoch()?;
let state = serde_json::to_string(&space_repetition::init())?;
let tx = conn.transaction()?;
for Question {
question,
responses,
} in questions
{
let responses = serialization::words_to_line(responses);
tx.execute(
query,
named_params![
":question": question,
":responses": responses,
":state": state,
":created": now,
":ready": now
],
)?;
}
tx.commit()?;
Ok(())
}
pub fn delete(conn: &mut Connection, questions: &Vec<Question>) -> Result<()> {
let query = r#"
UPDATE cards
SET deleted = :deleted
WHERE
question = :question
AND responses = :responses
"#;
let now = time::seconds_since_unix_epoch()?;
let tx = conn.transaction()?;
for Question {
question,
responses,
} in questions
{
let responses = serialization::words_to_line(responses);
tx.execute(
query,
named_params![
":deleted": now,
":question": question,
":responses": responses
],
)?;
}
tx.commit()?;
Ok(())
}
pub fn undelete(conn: &mut Connection, questions: &Vec<Question>) -> Result<()> {
let query = r#"
UPDATE cards
SET deleted = NULL
WHERE
question = :questions
AND responses = :responses
"#;
let tx = conn.transaction()?;
for Question {
question,
responses,
} in questions
{
let responses = serialization::words_to_line(responses);
tx.execute(
query,
named_params![
":question": question,
":responses": responses
],
)?;
}
tx.commit()?;
Ok(())
}
pub fn pick_random_ready(conn: &Connection) -> Option<Card> {
let query = r#"
SELECT question, responses, state, ready
FROM cards
WHERE deleted IS NULL AND ready <= :ready
ORDER BY RANDOM()
LIMIT 1
"#;
let now = time::seconds_since_unix_epoch().ok()?;
let mut stmt = conn.prepare(query).ok()?;
let mut rows = stmt.query(named_params![":ready": now]).ok()?;
let row = rows.next().ok()??;
let state_str: String = row.get(2).ok()?;
let responses_str: String = row.get(1).ok()?;
Some(Card {
question: row.get(0).ok()?,
responses: serialization::line_to_words(&responses_str),
state: serde_json::from_str(&state_str).ok()?,
})
}
pub fn next_ready(conn: &Connection) -> Option<u64> {
let query = r#"
SELECT ready
FROM cards
WHERE deleted IS NULL
ORDER BY ready
LIMIT 1
"#;
let mut stmt = conn.prepare(query).ok()?;
let mut rows = stmt.query([]).ok()?;
let row = rows.next().ok()??;
row.get(0).ok()?
}
pub fn count_available(conn: &Connection) -> Option<i32> {
let now = time::seconds_since_unix_epoch().ok()?;
let mut stmt = conn
.prepare("SELECT COUNT(*) FROM cards WHERE ready <= ? AND deleted IS NULL")
.ok()?;
let mut rows = stmt.query([now]).ok()?;
let row = rows.next().ok()??;
row.get(0).ok()?
}
pub fn update(conn: &Connection, question: &str, state: &space_repetition::State) -> Result<()> {
let query = r#"
UPDATE cards
SET state = :state, updated = :updated, ready = :ready
WHERE question = :question
"#;
let now = time::seconds_since_unix_epoch()?;
let ready = now + state.get_interval_seconds();
let state_str = serde_json::to_string(state)?;
conn.execute(
query,
named_params![
":state": state_str,
":updated": now,
":ready": ready,
":question": question
],
)?;
Ok(())
}
|
