drizzle 0.1.12

use drizzle_core::error::DrizzleError;
use drizzle_core::traits::ToSQL;
#[cfg(feature = "sqlite")]
use drizzle_sqlite::builder::{DeleteInitial, InsertInitial, SelectInitial, UpdateInitial};
#[cfg(feature = "sqlite")]
use drizzle_sqlite::traits::SQLiteTable;
use libsql::Row;
use std::marker::PhantomData;
use std::sync::atomic::AtomicU32;

use crate::builder::sqlite::rows::LibsqlRows as Rows;
use crate::transaction::savepoint::async_savepoint;

#[cfg(feature = "sqlite")]
use drizzle_sqlite::{
    builder::{
        self, QueryBuilder, delete::DeleteBuilder, insert::InsertBuilder, select::SelectBuilder,
        update::UpdateBuilder,
    },
    connection::SQLiteTransactionType,
    values::SQLiteValue,
};

/// LibSQL-specific transaction builder. See
/// [`crate::transaction::sqlite::typestate::TransactionBuilder`] for the
/// typestate-advancing methods; executor methods live below in this module.
pub type TransactionBuilder<'tx, Schema, Builder, State> =
    crate::transaction::sqlite::typestate::TransactionBuilder<
        'tx,
        Transaction<Schema>,
        Schema,
        Builder,
        State,
    >;

/// Transaction wrapper that provides the same query building capabilities as Drizzle
pub struct Transaction<Schema = ()> {
    tx: libsql::Transaction,
    tx_type: SQLiteTransactionType,
    savepoint_depth: AtomicU32,
    schema: Schema,
}

impl<Schema> std::fmt::Debug for Transaction<Schema> {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        f.debug_struct("Transaction")
            .field("tx_type", &self.tx_type)
            .field("savepoint_depth", &self.savepoint_depth)
            .finish_non_exhaustive()
    }
}

impl<Schema> Transaction<Schema> {
    /// Creates a new transaction wrapper
    pub(crate) const fn new(
        tx: libsql::Transaction,
        tx_type: SQLiteTransactionType,
        schema: Schema,
    ) -> Self {
        Self {
            tx,
            tx_type,
            savepoint_depth: AtomicU32::new(0),
            schema,
        }
    }

    /// Gets a reference to the schema.
    #[inline]
    pub const fn schema(&self) -> &Schema {
        &self.schema
    }

    /// Gets a reference to the underlying transaction
    #[inline]
    pub const fn inner(&self) -> &libsql::Transaction {
        &self.tx
    }

    /// Gets the transaction type
    #[inline]
    pub const fn tx_type(&self) -> SQLiteTransactionType {
        self.tx_type
    }

    /// Executes a raw SQL string with no parameters.
    async fn execute_raw(&self, sql: &str) -> Result<(), DrizzleError> {
        self.tx.execute(sql, ()).await?;
        Ok(())
    }

    /// Executes a nested savepoint within this transaction.
    ///
    /// The callback receives a reference to this transaction for executing
    /// queries. If the callback returns `Ok`, the savepoint is released.
    /// If it returns `Err`, the savepoint is rolled back.
    /// The outer transaction is unaffected either way.
    ///
    /// Savepoints can be nested — each level gets its own savepoint name.
    ///
    /// ```rust
    /// # let _ = r####"
    /// # use drizzle::sqlite::prelude::*;
    /// # use drizzle::sqlite::libsql::Drizzle;
    /// # use drizzle::sqlite::connection::SQLiteTransactionType;
    /// db.transaction(SQLiteTransactionType::Deferred, async |tx| {
    ///     tx.insert(user).values([InsertUser::new("Alice")]).execute().await?;
    ///
    ///     let _ = tx.savepoint(async |stx| {
    ///         stx.insert(user).values([InsertUser::new("Bad")]).execute().await?;
    ///         Err(drizzle::error::DrizzleError::Other("oops".into()))
    ///     }).await;
    ///
    ///     // Alice is still there
    ///     let users: Vec<SelectUser> = tx.select(()).from(user).all().await?;
    ///     assert_eq!(users.len(), 1);
    ///     Ok(())
    /// }).await?;
    /// # "####;
    /// ```
    ///
    /// # Errors
    ///
    /// Returns [`DrizzleError`] if the savepoint cannot be created/released, or the inner closure returns an error.
    pub async fn savepoint<F, R>(&self, f: F) -> drizzle_core::error::Result<R>
    where
        F: AsyncFnOnce(&Self) -> drizzle_core::error::Result<R>,
    {
        async_savepoint(
            &self.savepoint_depth,
            |sql| async move { self.execute_raw(&sql).await },
            f(self),
        )
        .await
    }

    sqlite_transaction_constructors!();

    /// Executes a raw query within the transaction
    ///
    /// # Errors
    ///
    /// Returns [`DrizzleError`] if the database call fails or the SQL is invalid.
    pub async fn execute<'q, T>(&self, query: T) -> Result<u64, DrizzleError>
    where
        T: ToSQL<'q, SQLiteValue<'q>>,
    {
        let query = query.to_sql();
        let (sql, params) = query.build();
        let params: Vec<libsql::Value> = params.into_iter().map(std::convert::Into::into).collect();

        Ok(self.tx.execute(&sql, params).await?)
    }

    /// Runs a query and returns all matching rows within the transaction
    ///
    /// # Errors
    ///
    /// Returns [`DrizzleError`] if the query fails or row decoding fails.
    pub async fn all<'q, T, R>(&self, query: T) -> drizzle_core::error::Result<Vec<R>>
    where
        R: for<'r> TryFrom<&'r Row>,
        for<'r> <R as TryFrom<&'r Row>>::Error: Into<DrizzleError>,
        T: ToSQL<'q, SQLiteValue<'q>>,
    {
        self.rows(query).await?.collect().await
    }

    /// Runs a query and returns a row cursor within the transaction.
    ///
    /// # Errors
    ///
    /// Returns [`DrizzleError`] if the query fails.
    pub async fn rows<'q, T, R>(&self, query: T) -> drizzle_core::error::Result<Rows<R>>
    where
        R: for<'r> TryFrom<&'r Row>,
        for<'r> <R as TryFrom<&'r Row>>::Error: Into<DrizzleError>,
        T: ToSQL<'q, SQLiteValue<'q>>,
    {
        let sql = query.to_sql();
        let (sql_str, params) = sql.build();
        let params: Vec<libsql::Value> = params.into_iter().map(std::convert::Into::into).collect();

        let rows = self.tx.query(&sql_str, params).await?;
        Ok(Rows::new(rows))
    }

    /// Runs a query and returns a single row within the transaction
    ///
    /// # Errors
    ///
    /// Returns [`DrizzleError`] if the query fails, no rows match (returns `DrizzleError::NotFound`), or decoding fails.
    pub async fn get<'q, T, R>(&self, query: T) -> drizzle_core::error::Result<R>
    where
        R: for<'r> TryFrom<&'r Row>,
        for<'r> <R as TryFrom<&'r Row>>::Error: Into<DrizzleError>,
        T: ToSQL<'q, SQLiteValue<'q>>,
    {
        let sql = query.to_sql();
        let (sql_str, params) = sql.build();
        let params: Vec<libsql::Value> = params.into_iter().map(std::convert::Into::into).collect();

        let mut rows = self.tx.query(&sql_str, params).await?;

        rows.next().await?.map_or_else(
            || Err(DrizzleError::NotFound),
            |row| R::try_from(&row).map_err(Into::into),
        )
    }

    /// Commits the transaction using libsql's SQL commands
    ///
    /// # Errors
    ///
    /// Returns [`DrizzleError`] if the commit call to the database fails.
    pub async fn commit(self) -> Result<(), DrizzleError> {
        Ok(self.tx.commit().await?)
    }

    /// Rolls back the transaction using libsql's SQL commands
    ///
    /// # Errors
    ///
    /// Returns [`DrizzleError`] if the rollback call to the database fails.
    pub async fn rollback(self) -> Result<(), DrizzleError> {
        Ok(self.tx.rollback().await?)
    }
}

#[cfg(feature = "libsql")]
impl<'tx, 'q, S, Schema, State, Table, Mk, Rw, Grouped>
    TransactionBuilder<'tx, S, QueryBuilder<'q, Schema, State, Table, Mk, Rw, Grouped>, State>
where
    State: builder::ExecutableState,
{
    /// Runs the query and returns the number of affected rows
    pub async fn execute(self) -> drizzle_core::error::Result<u64> {
        let (sql, params) = self.builder.sql.build();
        let params: Vec<libsql::Value> = params.into_iter().map(std::convert::Into::into).collect();

        Ok(self.runner.tx.execute(&sql, params).await?)
    }

    /// Runs the query and returns all matching rows using the builder's row type.
    pub async fn all<R, Proof, AggProof>(self) -> drizzle_core::error::Result<Vec<R>>
    where
        for<'r> Mk: drizzle_core::row::DecodeSelectedRef<&'r ::libsql::Row, R>
            + drizzle_core::row::MarkerScopeValidFor<Proof>
            + drizzle_core::row::StrictDecodeMarker
            + drizzle_core::row::MarkerColumnCountValid<::libsql::Row, Rw, R>,
        Mk: drizzle_core::row::MarkerAggValidFor<Grouped, AggProof>,
    {
        let (sql_str, params) = self.builder.sql.build();
        let params: Vec<libsql::Value> = params.into_iter().map(std::convert::Into::into).collect();
        let mut rows = self.runner.tx.query(&sql_str, params).await?;
        let mut decoded = Vec::new();
        while let Some(row) = rows.next().await? {
            decoded.push(<Mk as drizzle_core::row::DecodeSelectedRef<
                &::libsql::Row,
                R,
            >>::decode(&row)?);
        }
        Ok(decoded)
    }

    /// Runs the query and returns a row cursor using the builder's row type.
    pub async fn rows(self) -> drizzle_core::error::Result<Rows<Rw>>
    where
        Rw: for<'r> TryFrom<&'r Row>,
        for<'r> <Rw as TryFrom<&'r Row>>::Error: Into<DrizzleError>,
    {
        let (sql_str, params) = self.builder.sql.build();
        let params: Vec<libsql::Value> = params.into_iter().map(std::convert::Into::into).collect();

        let rows = self.runner.tx.query(&sql_str, params).await?;
        Ok(Rows::new(rows))
    }

    /// Runs the query and returns a single row using the builder's row type.
    pub async fn get<R, Proof, AggProof>(self) -> drizzle_core::error::Result<R>
    where
        for<'r> Mk: drizzle_core::row::DecodeSelectedRef<&'r ::libsql::Row, R>
            + drizzle_core::row::MarkerScopeValidFor<Proof>
            + drizzle_core::row::StrictDecodeMarker
            + drizzle_core::row::MarkerColumnCountValid<::libsql::Row, Rw, R>,
        Mk: drizzle_core::row::MarkerAggValidFor<Grouped, AggProof>,
    {
        let (sql_str, params) = self.builder.sql.build();
        let params: Vec<libsql::Value> = params.into_iter().map(std::convert::Into::into).collect();
        let mut rows = self.runner.tx.query(&sql_str, params).await?;
        rows.next().await?.map_or_else(
            || Err(DrizzleError::NotFound),
            |row| <Mk as drizzle_core::row::DecodeSelectedRef<&::libsql::Row, R>>::decode(&row),
        )
    }
}