create identity table to normalize children relationships

src/profile/identity/database.rs

@@ -0,0 +1,164 @@
+use gtk::glib::DateTime;
+use sqlite::{Connection, Error, Transaction};
+use std::{rc::Rc, sync::RwLock};
+
+pub struct Table {
+    pub id: i64,
+    pub profile_id: i64,
+    pub is_active: bool,
+    pub time: DateTime,
+    pub name: Option<String>,
+}
+
+pub struct Database {
+    pub connection: Rc<RwLock<Connection>>,
+}
+
+impl Database {
+    // Constructors
+
+    /// Create new `Self`
+    pub fn new(connection: Rc<RwLock<Connection>>) -> Self {
+        Self { connection }
+    }
+
+    // Getters
+
+    /// Get all records
+    pub fn records(&self) -> Vec<Table> {
+        let readable = self.connection.read().unwrap();
+        let tx = readable.unchecked_transaction().unwrap();
+        select(&tx).unwrap()
+    }
+
+    /// Get active identity record if exist
+    pub fn active(&self) -> Option<Table> {
+        self.records().into_iter().find(|record| record.is_active)
+    }
+
+    // Setters
+
+    /// Create new record in `Self` database connected
+    pub fn add(
+        &self,
+        profile_id: Rc<i64>,
+        is_active: bool,
+        time: DateTime,
+        name: Option<String>,
+    ) -> Result<i64, ()> {
+        // Begin new transaction
+        let mut writable = self.connection.write().unwrap();
+        let tx = writable.transaction().unwrap();
+
+        // New record has active status
+        if is_active {
+            // Deactivate other records as only one profile should be active
+            for record in select(&tx).unwrap() {
+                let _ = update(
+                    &tx,
+                    record.profile_id,
+                    record.id,
+                    false,
+                    record.time,
+                    record.name,
+                );
+            }
+        }
+
+        // Create new record
+        insert(&tx, profile_id, is_active, time, name).unwrap();
+
+        // Hold insert ID for result
+        let id = last_insert_id(&tx);
+
+        // Done
+        match tx.commit() {
+            Ok(_) => Ok(id),
+            Err(_) => Err(()), // @TODO
+        }
+    }
+}
+
+// Low-level DB API
+
+pub fn init(tx: &Transaction) -> Result<usize, Error> {
+    tx.execute(
+        "CREATE TABLE IF NOT EXISTS `profile_identity`
+        (
+            `id`         INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,
+            `profile_id` INTEGER NOT NULL,
+            `is_active`  INTEGER NOT NULL,
+            `time`       INTEGER NOT NULL,
+            `name`       VARCHAR(255),
+
+            FOREIGN KEY (`profile_id`) REFERENCES `profile`(`id`)
+        )",
+        [],
+    )
+}
+
+pub fn insert(
+    tx: &Transaction,
+    profile_id: Rc<i64>,
+    is_active: bool,
+    time: DateTime,
+    name: Option<String>,
+) -> Result<usize, Error> {
+    tx.execute(
+        "INSERT INTO `profile_identity` (
+            `profile_id`,
+            `is_active`,
+            `time`,
+            `name`
+        ) VALUES (?, ?, ?, ?)",
+        (profile_id, is_active, time.to_unix(), name),
+    )
+}
+
+pub fn update(
+    tx: &Transaction,
+    id: i64,
+    profile_id: i64,
+    is_active: bool,
+    time: DateTime,
+    name: Option<String>,
+) -> Result<usize, Error> {
+    tx.execute(
+        "UPDATE `profile_identity`
+        SET `profile_id` = ?,
+            `is_active`  = ?,
+            `time`       = ?,
+            `name`       = ?
+        WHERE
+            `id` = ?",
+        (profile_id, is_active, time.to_unix(), name, id),
+    )
+}
+
+pub fn select(tx: &Transaction) -> Result<Vec<Table>, Error> {
+    let mut stmt = tx.prepare(
+        "SELECT `id`, `profile_id`, `is_active`, `time`, `name` FROM `profile_identity`",
+    )?;
+    let result = stmt.query_map([], |row| {
+        Ok(Table {
+            id: row.get(0)?,
+            profile_id: row.get(1)?,
+            is_active: row.get(2)?,
+            time: DateTime::from_unix_local(row.get(3)?).unwrap(),
+            name: row.get(4)?,
+        })
+    })?;
+
+    let mut records = Vec::new();
+
+    for record in result {
+        let table = record?;
+        records.push(table);
+    }
+
+    Ok(records)
+}
+
+pub fn last_insert_id(tx: &Transaction) -> i64 {
+    tx.last_insert_rowid()
+}