use sea_orm_migration::prelude::*;

#[derive(DeriveMigrationName)]
pub struct Migration;

#[async_trait::async_trait]
impl MigrationTrait for Migration {
    async fn up(&self, manager: &SchemaManager) -> Result<(), DbErr> {
        manager
            .alter_table(
                TableAlterStatement::new()
                    .table(Transaction::Table)
                    .modify_column(ColumnDef::new(Transaction::Title).string().null())
                    .to_owned(),
            )
            .await?;

        // Set all empty string titles to null
        manager
            .get_connection()
            .execute_unprepared(
                r#"
            update transaction
            set title = null
            where title = ''
        "#,
            )
            .await?;

        Ok(())
    }

    async fn down(&self, manager: &SchemaManager) -> Result<(), DbErr> {
        // Set all null titles to empty string when reverting
        manager
            .get_connection()
            .execute_unprepared(
                r#"
            update transaction
            set title = ''
            where title is null
        "#,
            )
            .await?;

        manager
            .alter_table(
                TableAlterStatement::new()
                    .table(Transaction::Table)
                    .modify_column(ColumnDef::new(Transaction::Title).string().not_null())
                    .to_owned(),
            )
            .await
    }
}

#[derive(DeriveIden)]
enum Transaction {
    Table,
    Title,
}