Refactors rust code into workspace

22 files changed, 1198 insertions, 0 deletions

diff --git a/backend/actualbudget_importer/Cargo.lock b/backend/actualbudget_importer/Cargo.lock
new file mode 100644
index 0000000..edaab83
--- /dev/null
+++ b/backend/actualbudget_importer/Cargo.lock
@@ -0,0 +1,679 @@
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+checksum = "c62a0a307cb4a311d3a07867860911ca130c3494e8c2719593806c08bc5d0484"
+
+[[package]]
+name = "windows-core"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "33ab640c8d7e35bf8ba19b884ba838ceb4fba93a4e8c65a9059d08afcfc683d9"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
+
+[[package]]
+name = "winnow"
+version = "0.6.20"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "36c1fec1a2bb5866f07c25f68c26e565c4c200aebb96d7e55710c19d3e8ac49b"
+dependencies = [
+ "memchr",
+]
diff --git a/backend/actualbudget_importer/Cargo.toml b/backend/actualbudget_importer/Cargo.toml
new file mode 100644
index 0000000..69d297f
--- /dev/null
+++ b/backend/actualbudget_importer/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "actualbudget_importer"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+anyhow = { workspace = true }
+budgeting_app_core = { path = "../core" }
+chrono = { workspace = true, features = ["serde"] }
+diesel = { workspace = true, features = ["sqlite"] }
+libsqlite3-sys = { workspace = true, features = ["bundled"] }
diff --git a/backend/actualbudget_importer/src/main.rs b/backend/actualbudget_importer/src/main.rs
new file mode 100644
index 0000000..cb69bb5
--- /dev/null
+++ b/backend/actualbudget_importer/src/main.rs
@@ -0,0 +1,45 @@
+pub mod models;
+pub mod queries;
+pub mod schema;
+pub mod transformers;
+
+use anyhow::Result;
+use budgeting_app_core::queries as budgeting_app_queries;
+use diesel::{Connection, SqliteConnection};
+use queries::{actualbudget_accounts::{get_all_actualbudget_accounts, get_category_transfers_account}, actualbudget_categories::get_all_actualbudget_categories, actualbudget_transactions::{get_all_actualbudget_transactions, get_first_actualbudget_transaction_date}, actualbudget_zero_budgets::get_all_actualbudget_zero_budgets};
+
+fn main() -> Result<()> {
+    let connection_src = &mut SqliteConnection::establish("in.sqlite").unwrap();
+    let connection_dest = &mut SqliteConnection::establish("out.sqlite").unwrap();
+
+    let actualbudget_first_transaction_date = get_first_actualbudget_transaction_date(connection_src)?;
+    let actualbudget_accounts = get_all_actualbudget_accounts(connection_src)?;
+    let actualbudget_categories = get_all_actualbudget_categories(connection_src)?;
+    let actualbudget_zero_budgets = get_all_actualbudget_zero_budgets(connection_src)?;
+    let actualbudget_category_transfers_account = get_category_transfers_account(connection_src)?;
+    let actualbudget_transactions = get_all_actualbudget_transactions(connection_src)?;
+
+    let first_transaction_date = transformers::transform_date(&actualbudget_first_transaction_date)?;
+    let accounts =
+        transformers::transform_accounts(&actualbudget_accounts, &first_transaction_date);
+    let categories = transformers::transform_categories(&actualbudget_categories);
+    let budget_updates = transformers::transform_budget_updates(&actualbudget_zero_budgets)?;
+    let (transactions, transaction_categorisations) = transformers::transform_transactions(
+        &actualbudget_transactions,
+        &actualbudget_category_transfers_account,
+    )?;
+    let category_transfers = transformers::transform_category_transfers(
+        &actualbudget_transactions,
+        &actualbudget_category_transfers_account,
+    );
+
+    budgeting_app_queries::clear::clear(connection_dest)?;
+    budgeting_app_queries::accounts::insert_accounts(&accounts, connection_dest)?;
+    budgeting_app_queries::categories::insert_categories(&categories, connection_dest)?;
+    budgeting_app_queries::budget_updates::insert_budget_updates(&budget_updates, connection_dest)?;
+    budgeting_app_queries::transactions::insert_transactions(&transactions, connection_dest)?;
+    budgeting_app_queries::transaction_categorisations::insert_transaction_categorisations(&transaction_categorisations, connection_dest)?;
+    budgeting_app_queries::category_transfers::insert_category_transfers(&category_transfers, connection_dest)?;
+
+    Ok(())
+}
diff --git a/backend/actualbudget_importer/src/models/actualbudget_account.rs b/backend/actualbudget_importer/src/models/actualbudget_account.rs
new file mode 100644
index 0000000..b3d00ac
--- /dev/null
+++ b/backend/actualbudget_importer/src/models/actualbudget_account.rs
@@ -0,0 +1,8 @@
+use diesel::prelude::{Queryable, Selectable};
+
+#[derive(Queryable, Selectable)]
+#[diesel(table_name = crate::schema::accounts)]
+pub struct ActualbudgetAccount {
+    pub id: String,
+    pub name: String,
+}
diff --git a/backend/actualbudget_importer/src/models/actualbudget_category.rs b/backend/actualbudget_importer/src/models/actualbudget_category.rs
new file mode 100644
index 0000000..cbea99b
--- /dev/null
+++ b/backend/actualbudget_importer/src/models/actualbudget_category.rs
@@ -0,0 +1,8 @@
+use diesel::{prelude::Queryable, Selectable};
+
+#[derive(Queryable, Selectable)]
+#[diesel(table_name = crate::schema::categories)]
+pub struct ActualbudgetCategory {
+    pub id: String,
+    pub name: String,
+}
diff --git a/backend/actualbudget_importer/src/models/actualbudget_date.rs b/backend/actualbudget_importer/src/models/actualbudget_date.rs
new file mode 100644
index 0000000..bef160c
--- /dev/null
+++ b/backend/actualbudget_importer/src/models/actualbudget_date.rs
@@ -0,0 +1,75 @@
+use diesel::{backend::Backend, deserialize::{FromSql, FromSqlRow}, expression::AsExpression, sql_types::Integer, sqlite::Sqlite};
+
+#[derive(Clone, PartialEq, Eq, Debug, AsExpression, FromSqlRow)]
+#[diesel(sql_type=Integer)]
+pub struct ActualbudgetDate(i32);
+
+#[derive(Clone, PartialOrd, PartialEq, Eq)]
+enum DatePart {
+    MonthOfYear,
+    DayOfMonth,
+}
+
+// actualbudget represents dates as numbers which "look like" the corresponding
+// ISO string when written in decimal. E.g. 20240901 represents 1 Sep 2024. It
+// also uses month specifiers, e.g. 202409 to represent Sep 2024. In this case,
+// we interpret this as the first day of the month, e.g. 2024-09-01.
+
+impl ActualbudgetDate {
+    pub fn to_iso(&self) -> String {
+        format!("{0}-{1}-{2}", self.year(), self.month(), self.day())
+    }
+
+    pub fn year(&self) -> String {
+        self.0.to_string()[0..4].to_string()
+    }
+
+    pub fn month(&self) -> String {
+        self.0.to_string()[4..6].to_string()
+    }
+
+    pub fn day(&self) -> String {
+        match self.date_part() {
+            DatePart::DayOfMonth => self.0.to_string()[6..8].to_string(),
+            DatePart::MonthOfYear => String::from("01"),
+        }
+    }
+
+    pub fn from_i32(i: i32) -> Self {
+        ActualbudgetDate(i)
+    }
+
+    fn date_part(&self) -> DatePart {
+        if self.0 < 10000000 {
+            DatePart::MonthOfYear
+        } else {
+            DatePart::DayOfMonth
+        }
+    }
+
+    fn dayified_value(&self) -> i32 {
+        match self.date_part() {
+            DatePart::DayOfMonth => self.0,
+            DatePart::MonthOfYear => self.0 * 100 + 1,
+        }
+    }
+}
+
+impl Ord for ActualbudgetDate {
+    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
+        self.dayified_value().cmp(&other.dayified_value())
+    }
+}
+
+impl PartialOrd for ActualbudgetDate {
+    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl FromSql<Integer, Sqlite> for ActualbudgetDate {
+    fn from_sql(bytes: <Sqlite as Backend>::RawValue<'_>) -> diesel::deserialize::Result<Self> {
+        let int: i32 = FromSql::<Integer, Sqlite>::from_sql(bytes)?;
+        Ok(ActualbudgetDate(int))
+    }
+}
diff --git a/backend/actualbudget_importer/src/models/actualbudget_transaction.rs b/backend/actualbudget_importer/src/models/actualbudget_transaction.rs
new file mode 100644
index 0000000..be2ca1a
--- /dev/null
+++ b/backend/actualbudget_importer/src/models/actualbudget_transaction.rs
@@ -0,0 +1,18 @@
+use diesel::prelude::{Identifiable, Queryable, QueryableByName, Selectable};
+
+use crate::models::actualbudget_date::ActualbudgetDate;
+
+#[derive(Identifiable, QueryableByName, Queryable, Selectable, Clone)]
+#[diesel(table_name = crate::schema::transactions)]
+pub struct ActualbudgetTransaction {
+    pub id: String,
+    pub is_parent: bool,
+    pub is_child: bool,
+    pub account_id: String,
+    pub category_id: String,
+    pub amount: i32,
+    pub payee: String,
+    pub notes: String,
+    pub date: ActualbudgetDate,
+    pub parent_id: Option<String>,
+}
diff --git a/backend/actualbudget_importer/src/models/actualbudget_zero_budget.rs b/backend/actualbudget_importer/src/models/actualbudget_zero_budget.rs
new file mode 100644
index 0000000..6478d34
--- /dev/null
+++ b/backend/actualbudget_importer/src/models/actualbudget_zero_budget.rs
@@ -0,0 +1,13 @@
+use crate::models::actualbudget_date::ActualbudgetDate;
+use diesel::{prelude::{Identifiable, Queryable, QueryableByName, Selectable}, sqlite::Sqlite};
+
+#[derive(Identifiable, QueryableByName, Queryable, Selectable, Clone)]
+#[diesel(table_name = crate::schema::zero_budgets)]
+#[diesel(check_for_backend(Sqlite))]
+pub struct ActualbudgetZeroBudget {
+    pub id: String,
+    pub month: ActualbudgetDate,
+    pub category_id: String,
+    pub amount: i32,
+    pub do_carry_over: i32,
+}
diff --git a/backend/actualbudget_importer/src/models/mod.rs b/backend/actualbudget_importer/src/models/mod.rs
new file mode 100644
index 0000000..1c97c65
--- /dev/null
+++ b/backend/actualbudget_importer/src/models/mod.rs
@@ -0,0 +1,5 @@
+pub mod actualbudget_account;
+pub mod actualbudget_category;
+pub mod actualbudget_date;
+pub mod actualbudget_transaction;
+pub mod actualbudget_zero_budget;
diff --git a/backend/actualbudget_importer/src/queries/actualbudget_accounts/get_all.rs b/backend/actualbudget_importer/src/queries/actualbudget_accounts/get_all.rs
new file mode 100644
index 0000000..6f667de
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/actualbudget_accounts/get_all.rs
@@ -0,0 +1,6 @@
+use crate::{models::actualbudget_account::ActualbudgetAccount, schema::accounts::dsl::accounts};
+use diesel::{result::Error, QueryDsl, RunQueryDsl, SelectableHelper, SqliteConnection};
+
+pub fn get_all_actualbudget_accounts(connection: &mut SqliteConnection) -> Result<Vec<ActualbudgetAccount>, Error> {
+    accounts.select(ActualbudgetAccount::as_select()).load(connection)
+}
diff --git a/backend/actualbudget_importer/src/queries/actualbudget_accounts/get_category_transfers_account.rs b/backend/actualbudget_importer/src/queries/actualbudget_accounts/get_category_transfers_account.rs
new file mode 100644
index 0000000..f05dc78
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/actualbudget_accounts/get_category_transfers_account.rs
@@ -0,0 +1,13 @@
+use diesel::{result::Error, ExpressionMethods, QueryDsl, RunQueryDsl, SelectableHelper, SqliteConnection};
+
+use crate::{models::actualbudget_account::ActualbudgetAccount, schema::accounts::{
+    self as accounts_schema,
+    dsl::accounts as accounts_table,
+}};
+
+pub fn get_category_transfers_account(connection: &mut SqliteConnection) -> Result<ActualbudgetAccount, Error> {
+    accounts_table
+        .filter(accounts_schema::name.eq("Category transfers"))
+        .select(ActualbudgetAccount::as_select())
+        .first(connection)
+}
diff --git a/backend/actualbudget_importer/src/queries/actualbudget_accounts/mod.rs b/backend/actualbudget_importer/src/queries/actualbudget_accounts/mod.rs
new file mode 100644
index 0000000..c6d6015
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/actualbudget_accounts/mod.rs
@@ -0,0 +1,5 @@
+mod get_all;
+mod get_category_transfers_account;
+
+pub use get_all::get_all_actualbudget_accounts;
+pub use get_category_transfers_account::get_category_transfers_account;
diff --git a/backend/actualbudget_importer/src/queries/actualbudget_categories/get_all.rs b/backend/actualbudget_importer/src/queries/actualbudget_categories/get_all.rs
new file mode 100644
index 0000000..4cb7ebc
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/actualbudget_categories/get_all.rs
@@ -0,0 +1,6 @@
+use crate::{models::actualbudget_category::ActualbudgetCategory, schema::categories::dsl::categories};
+use diesel::{result::Error, QueryDsl, RunQueryDsl, SelectableHelper, SqliteConnection};
+
+pub fn get_all_actualbudget_categories(connection: &mut SqliteConnection) -> Result<Vec<ActualbudgetCategory>, Error> {
+    categories.select(ActualbudgetCategory::as_select()).load(connection)
+}
diff --git a/backend/actualbudget_importer/src/queries/actualbudget_categories/mod.rs b/backend/actualbudget_importer/src/queries/actualbudget_categories/mod.rs
new file mode 100644
index 0000000..0c04e53
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/actualbudget_categories/mod.rs
@@ -0,0 +1,3 @@
+mod get_all;
+
+pub use get_all::get_all_actualbudget_categories;
diff --git a/backend/actualbudget_importer/src/queries/actualbudget_transactions/get_all.rs b/backend/actualbudget_importer/src/queries/actualbudget_transactions/get_all.rs
new file mode 100644
index 0000000..84c8d08
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/actualbudget_transactions/get_all.rs
@@ -0,0 +1,6 @@
+use crate::{models::actualbudget_transaction::ActualbudgetTransaction, schema::transactions::dsl::transactions};
+use diesel::{result::Error, QueryDsl, RunQueryDsl, SelectableHelper, SqliteConnection};
+
+pub fn get_all_actualbudget_transactions(connection: &mut SqliteConnection) -> Result<Vec<ActualbudgetTransaction>, Error> {
+    transactions.select(ActualbudgetTransaction::as_select()).load(connection)
+}
diff --git a/backend/actualbudget_importer/src/queries/actualbudget_transactions/get_first_date.rs b/backend/actualbudget_importer/src/queries/actualbudget_transactions/get_first_date.rs
new file mode 100644
index 0000000..b958c37
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/actualbudget_transactions/get_first_date.rs
@@ -0,0 +1,14 @@
+use anyhow::Result;
+use crate::{models::actualbudget_date::ActualbudgetDate, schema::transactions::{
+    self as transactions_schema,
+    dsl::transactions as transactions_table,
+}};
+use diesel::{dsl::min, result::Error, QueryDsl, RunQueryDsl, SqliteConnection};
+
+pub fn get_first_actualbudget_transaction_date(connection: &mut SqliteConnection) -> Result<ActualbudgetDate> {
+    let date_as_int = transactions_table
+        .select(min(transactions_schema::date))
+        .first::<Option<i32>>(connection)
+        .map_or_else(|e| Err(e), |o| o.map_or_else(|| Err(Error::NotFound), |i| Ok(i)))?;
+    Ok(ActualbudgetDate::from_i32(date_as_int))
+}
diff --git a/backend/actualbudget_importer/src/queries/actualbudget_transactions/mod.rs b/backend/actualbudget_importer/src/queries/actualbudget_transactions/mod.rs
new file mode 100644
index 0000000..b4ed0dd
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/actualbudget_transactions/mod.rs
@@ -0,0 +1,5 @@
+mod get_all;
+mod get_first_date;
+
+pub use get_all::get_all_actualbudget_transactions;
+pub use get_first_date::get_first_actualbudget_transaction_date;
diff --git a/backend/actualbudget_importer/src/queries/actualbudget_zero_budgets/get_all.rs b/backend/actualbudget_importer/src/queries/actualbudget_zero_budgets/get_all.rs
new file mode 100644
index 0000000..0c3f695
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/actualbudget_zero_budgets/get_all.rs
@@ -0,0 +1,6 @@
+use crate::{models::actualbudget_zero_budget::ActualbudgetZeroBudget, schema::zero_budgets::dsl::zero_budgets};
+use diesel::{result::Error, QueryDsl, RunQueryDsl, SelectableHelper, SqliteConnection};
+
+pub fn get_all_actualbudget_zero_budgets(connection: &mut SqliteConnection) -> Result<Vec<ActualbudgetZeroBudget>, Error> {
+    zero_budgets.select(ActualbudgetZeroBudget::as_select()).load(connection)
+}
diff --git a/backend/actualbudget_importer/src/queries/actualbudget_zero_budgets/mod.rs b/backend/actualbudget_importer/src/queries/actualbudget_zero_budgets/mod.rs
new file mode 100644
index 0000000..ba7e21b
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/actualbudget_zero_budgets/mod.rs
@@ -0,0 +1,3 @@
+mod get_all;
+
+pub use get_all::get_all_actualbudget_zero_budgets;
diff --git a/backend/actualbudget_importer/src/queries/mod.rs b/backend/actualbudget_importer/src/queries/mod.rs
new file mode 100644
index 0000000..e16dafc
--- /dev/null
+++ b/backend/actualbudget_importer/src/queries/mod.rs
@@ -0,0 +1,4 @@
+pub mod actualbudget_accounts;
+pub mod actualbudget_categories;
+pub mod actualbudget_transactions;
+pub mod actualbudget_zero_budgets;
diff --git a/backend/actualbudget_importer/src/schema.rs b/backend/actualbudget_importer/src/schema.rs
new file mode 100644
index 0000000..a872231
--- /dev/null
+++ b/backend/actualbudget_importer/src/schema.rs
@@ -0,0 +1,47 @@
+diesel::table! {
+    accounts (id) {
+        id -> Text,
+        name -> Text,
+    }
+}
+
+diesel::table! {
+    categories (id) {
+        id -> Text,
+        name -> Text,
+    }
+}
+
+diesel::table! {
+    transactions (id) {
+        id -> Text,
+        #[sql_name = "isParent"]
+        is_parent -> Bool,
+        #[sql_name = "isChild"]
+        is_child -> Bool,
+        #[sql_name = "acct"]
+        account_id -> Text,
+        #[sql_name = "category"]
+        category_id -> Text,
+        amount -> Integer,
+        #[sql_name = "description"]
+        payee -> Text,
+        notes -> Text,
+        date -> Integer,
+        parent_id -> Nullable<Text>,
+    }
+}
+
+diesel::table! {
+    zero_budgets (id) {
+        id -> Text,
+        month -> Integer,
+        #[sql_name = "category"]
+        category_id -> Text,
+        amount -> Integer,
+        #[sql_name = "carryover"]
+        do_carry_over -> Integer,
+        // goal -> Integer,
+        // long_goal -> Integer,
+    }
+}
diff --git a/backend/actualbudget_importer/src/transformers.rs b/backend/actualbudget_importer/src/transformers.rs
new file mode 100644
index 0000000..dd4d154
--- /dev/null
+++ b/backend/actualbudget_importer/src/transformers.rs
@@ -0,0 +1,218 @@
+use anyhow::Result;
+use budgeting_app_core::models::{
+    account::Account, budget_update::BudgetUpdate, category::Category, category_transfer::CategoryTransfer, date_utc::DateUtc, datetime_utc::DatetimeUtc, transaction::Transaction, transaction_categorisation::TransactionCategorisation
+};
+use core::panic;
+use std::hash::{DefaultHasher, Hash, Hasher};
+
+use crate::models::{actualbudget_account::ActualbudgetAccount, actualbudget_category::ActualbudgetCategory, actualbudget_date::ActualbudgetDate, actualbudget_transaction::ActualbudgetTransaction, actualbudget_zero_budget::ActualbudgetZeroBudget};
+
+pub fn transform_date(actualbudget_date: &ActualbudgetDate) -> Result<DatetimeUtc> {
+    actualbudget_date.to_iso().parse()
+}
+
+pub fn transform_accounts(
+    actualbudget_accounts: &[ActualbudgetAccount],
+    first_transaction_date: &DatetimeUtc,
+) -> Vec<Account> {
+    let mut accounts = Vec::<Account>::new();
+    for account in actualbudget_accounts {
+        accounts.push(transform_account(account, first_transaction_date));
+    }
+    accounts
+}
+
+fn transform_account(
+    actualbudget_account: &ActualbudgetAccount,
+    opening_date: &DatetimeUtc,
+) -> Account {
+    Account {
+        id: transform_id(&actualbudget_account.id.clone()),
+        name: actualbudget_account.name.clone(),
+        opening_balance: 0,
+        opening_date: opening_date.clone(),
+    }
+}
+
+pub fn transform_categories(
+    actualbudget_categories: &[ActualbudgetCategory],
+) -> Vec<Category> {
+    let mut categories = Vec::<Category>::new();
+    for actualbudget_category in actualbudget_categories {
+        categories.push(Category {
+            id: transform_id(&actualbudget_category.id.clone()),
+            name: actualbudget_category.name.clone(),
+        })
+    }
+    categories
+}
+
+fn transform_id(actualbudget_id: &str) -> i32 {
+    let mut hasher = DefaultHasher::new();
+    actualbudget_id.hash(&mut hasher);
+    (hasher.finish() % std::convert::TryInto::<u64>::try_into(i32::MAX).unwrap())
+        .try_into()
+        .unwrap()
+}
+
+pub fn transform_budget_updates(
+    actualbudget_zero_budgets: &[ActualbudgetZeroBudget],
+) -> Result<Vec<BudgetUpdate>> {
+    let mut budget_updates = Vec::<BudgetUpdate>::new();
+    for zero_budget in actualbudget_zero_budgets {
+        let first_zero_budget_in_category = get_first_zero_budget_in_category(
+            actualbudget_zero_budgets,
+            &zero_budget.category_id.clone(),
+        );
+        if first_zero_budget_in_category.is_some_and(|zb| zb.id == zero_budget.id) {
+            continue;
+        }
+        budget_updates.push(BudgetUpdate {
+            id: transform_id(&zero_budget.id.clone()),
+            category_id: transform_id(&zero_budget.category_id.clone()),
+            date: DateUtc::from(transform_date(&zero_budget.month.clone())?),
+            new_budget: zero_budget.amount.try_into().unwrap(),
+            new_period: 30,
+        })
+    }
+    Ok(budget_updates)
+}
+
+fn get_first_zero_budget_in_category(
+    actualbudget_zero_budgets: &[ActualbudgetZeroBudget],
+    actualbudget_category_id: &str,
+) -> Option<ActualbudgetZeroBudget> {
+    let mut category_zero_budgets = actualbudget_zero_budgets.to_vec();
+    category_zero_budgets.retain(|zb| zb.category_id == actualbudget_category_id);
+    category_zero_budgets
+        .iter()
+        .min_by_key(|zb| zb.month.clone())
+        .cloned()
+}
+
+pub fn transform_transactions(
+    actualbudget_transactions: &[ActualbudgetTransaction],
+    actualbudget_category_transfers_account: &ActualbudgetAccount,
+) -> Result<(Vec<Transaction>, Vec<TransactionCategorisation>)> {
+    let mut transactions = Vec::<Transaction>::new();
+    let mut transaction_categorisations = Vec::<TransactionCategorisation>::new();
+
+    let mut actualbudget_transactions = actualbudget_transactions.to_vec();
+    actualbudget_transactions
+        .retain(|t| t.category_id.clone() != actualbudget_category_transfers_account.id.clone());
+    let mut parent_actualbudget_transactions = actualbudget_transactions.to_vec();
+    parent_actualbudget_transactions.retain(|t| t.is_parent);
+    let mut child_actualbudget_transactions = actualbudget_transactions.to_vec();
+    child_actualbudget_transactions.retain(|t| t.is_child);
+    let mut atomic_actualbudget_transactions = actualbudget_transactions.to_vec();
+    atomic_actualbudget_transactions.retain(|t| !t.is_parent && !t.is_child);
+
+    for atomic_actualbudget_transaction in atomic_actualbudget_transactions {
+        let transaction_id = transform_id(&atomic_actualbudget_transaction.id);
+
+        transactions.push(Transaction {
+            id: transaction_id,
+            description: atomic_actualbudget_transaction.notes,
+            payee: atomic_actualbudget_transaction.payee,
+            quantity: atomic_actualbudget_transaction.amount.try_into().unwrap(),
+            date: transform_date(&atomic_actualbudget_transaction.date)?,
+            account_id: transform_id(&atomic_actualbudget_transaction.account_id),
+        });
+
+        transaction_categorisations.push(TransactionCategorisation {
+            id: transaction_id,
+            description: String::new(),
+            quantity: atomic_actualbudget_transaction.amount.try_into().unwrap(),
+            transaction_id,
+            category_id: transform_id(&atomic_actualbudget_transaction.category_id),
+        });
+    }
+
+    for parent_actualbudget_transaction in parent_actualbudget_transactions {
+        let mut child_actualbudget_transactions = child_actualbudget_transactions.to_vec();
+        child_actualbudget_transactions.retain(|t| {
+            t.parent_id
+                .clone()
+                .is_some_and(|parent_id| parent_id == parent_actualbudget_transaction.id.clone())
+        });
+
+        let transaction_id = transform_id(&parent_actualbudget_transaction.id);
+
+        transactions.push(Transaction {
+            id: transaction_id,
+            description: parent_actualbudget_transaction.notes,
+            payee: parent_actualbudget_transaction.payee,
+            quantity: parent_actualbudget_transaction.amount.try_into().unwrap(),
+            date: transform_date(&parent_actualbudget_transaction.date)?,
+            account_id: transform_id(&parent_actualbudget_transaction.account_id),
+        });
+
+        for child_actualbudget_transaction in child_actualbudget_transactions {
+            transaction_categorisations.push(TransactionCategorisation {
+                id: transform_id(&child_actualbudget_transaction.id),
+                description: child_actualbudget_transaction.notes,
+                quantity: child_actualbudget_transaction.amount.try_into().unwrap(),
+                transaction_id,
+                category_id: transform_id(&child_actualbudget_transaction.category_id),
+            });
+        }
+    }
+
+    Ok((transactions, transaction_categorisations))
+}
+
+pub fn transform_category_transfers(
+    actualbudget_transactions: &[ActualbudgetTransaction],
+    actualbudget_category_transfers_account: &ActualbudgetAccount,
+) -> Vec<CategoryTransfer> {
+    let mut category_transfers = Vec::<CategoryTransfer>::new();
+
+    let mut actualbudget_category_transfers = actualbudget_transactions.to_vec();
+    actualbudget_category_transfers
+        .retain(|t| t.category_id.clone() == actualbudget_category_transfers_account.id.clone());
+    let mut actualbudget_parent_category_transfers = actualbudget_category_transfers.to_vec();
+    actualbudget_parent_category_transfers.retain(|t| t.is_parent);
+    let mut actualbudget_child_category_transfers = actualbudget_category_transfers.to_vec();
+    actualbudget_child_category_transfers.retain(|t| t.is_child);
+
+    for actualbudget_parent_category_transfer in actualbudget_parent_category_transfers {
+        let mut actualbudget_child_category_transfers =
+            actualbudget_child_category_transfers.to_vec();
+        actualbudget_child_category_transfers.retain(|t| {
+            t.parent_id
+                .clone()
+                .is_some_and(|parent_id| parent_id == actualbudget_parent_category_transfer.id)
+        });
+
+        if actualbudget_child_category_transfers.len() != 2 {
+            panic!("Category transfers should always have exactly two children.");
+        }
+
+        let category_1 = actualbudget_child_category_transfers[0].clone();
+        let category_2 = actualbudget_child_category_transfers[1].clone();
+
+        // To avoid duplicates
+        if category_1.amount >= 0 {
+            continue;
+        }
+
+        if actualbudget_child_category_transfers[0].amount
+            != -actualbudget_child_category_transfers[1].amount
+        {
+            panic!("Category transfer children should sum to zero.");
+        }
+
+        category_transfers.push(CategoryTransfer {
+            id: transform_id(&actualbudget_parent_category_transfer.id),
+            description: actualbudget_parent_category_transfer.notes,
+            quantity: actualbudget_child_category_transfers[0]
+                .amount
+                .try_into()
+                .unwrap(),
+            from_category_id: transform_id(&category_1.id),
+            to_category_id: transform_id(&category_2.id),
+        });
+    }
+
+    category_transfers
+}