use actix::Message;
use model::{ProductId, Quantity, QuantityUnit, Stock, StockId};

use crate::{MultiLoad, Result};

#[derive(Debug, Copy, Clone, PartialEq, serde::Serialize, thiserror::Error)]
pub enum Error {
    #[error("Unable to load all stocks")]
    All,
    #[error("Unable to create stock")]
    Create,
    #[error("Unable to update stock")]
    Update,
    #[error("Unable to delete stock")]
    Delete,
    #[error("Unable find stock for product")]
    ProductStock,
}

#[derive(Message)]
#[rtype(result = "Result<Vec<model::Stock>>")]
pub struct AllStocks;

crate::db_async_handler!(AllStocks, all_stocks, Vec<Stock>, inner_all_stocks);

async fn all_stocks(
    _msg: AllStocks,
    pool: &mut sqlx::Transaction<'_, sqlx::Postgres>,
) -> Result<Vec<Stock>> {
    sqlx::query_as(
        r#"
SELECT id, product_id, quantity, quantity_unit
FROM stocks
    "#,
    )
    .fetch_all(pool)
    .await
    .map_err(|e| {
        log::error!("{e:?}");
        crate::Error::Stock(Error::All)
    })
}

#[derive(Message)]
#[rtype(result = "Result<model::Stock>")]
pub struct CreateStock {
    pub product_id: ProductId,
    pub quantity: Quantity,
    pub quantity_unit: QuantityUnit,
}

crate::db_async_handler!(CreateStock, create_stock, Stock, inner_create_stock);

async fn create_stock(
    msg: CreateStock,
    pool: &mut sqlx::Transaction<'_, sqlx::Postgres>,
) -> Result<Stock> {
    sqlx::query_as(
        r#"
INSERT INTO stocks (product_id, quantity, quantity_unit)
VALUES ($1, $2, $3)
RETURNING id, product_id, quantity, quantity_unit
    "#,
    )
    .bind(msg.product_id)
    .bind(msg.quantity)
    .bind(msg.quantity_unit)
    .fetch_one(pool)
    .await
    .map_err(|e| {
        log::error!("{e:?}");
        eprintln!("{e:?}");
        crate::Error::Stock(Error::Create)
    })
}

#[derive(Message)]
#[rtype(result = "Result<model::Stock>")]
pub struct UpdateStock {
    pub id: StockId,
    pub product_id: ProductId,
    pub quantity: Quantity,
    pub quantity_unit: QuantityUnit,
}

crate::db_async_handler!(UpdateStock, update_stock, Stock, inner_update_stock);

async fn update_stock(
    msg: UpdateStock,
    pool: &mut sqlx::Transaction<'_, sqlx::Postgres>,
) -> Result<Stock> {
    sqlx::query_as(
        r#"
UPDATE stocks
SET product_id = $1 AND
    quantity = $2
    quantity_unit = $3
WHERE id = $4
RETURNING id, product_id, quantity, quantity_unit
    "#,
    )
    .bind(msg.product_id)
    .bind(msg.quantity)
    .bind(msg.quantity_unit)
    .bind(msg.id)
    .fetch_one(pool)
    .await
    .map_err(|e| {
        log::error!("{e:?}");
        crate::Error::Stock(Error::Update)
    })
}

#[derive(Message)]
#[rtype(result = "Result<Option<model::Stock>>")]
pub struct DeleteStock {
    pub stock_id: StockId,
}

crate::db_async_handler!(
    DeleteStock,
    delete_stock,
    Option<model::Stock>,
    inner_delete_stock
);

async fn delete_stock(
    msg: DeleteStock,
    pool: &mut sqlx::Transaction<'_, sqlx::Postgres>,
) -> Result<Option<Stock>> {
    sqlx::query_as(
        r#"
DELETE FROM stocks
WHERE id = $1
RETURNING id, product_id, quantity, quantity_unit
    "#,
    )
    .bind(msg.stock_id)
    .fetch_optional(pool)
    .await
    .map_err(|e| {
        log::error!("{e:?}");
        crate::Error::Stock(Error::Delete)
    })
}

#[derive(Message)]
#[rtype(result = "Result<Vec<model::Stock>>")]
pub struct ProductsStock {
    pub product_ids: Vec<ProductId>,
}

crate::db_async_handler!(
    ProductsStock,
    product_stock,
    Vec<model::Stock>,
    inner_product_stock
);

async fn product_stock(
    msg: ProductsStock,
    pool: &mut sqlx::Transaction<'_, sqlx::Postgres>,
) -> Result<Vec<Stock>> {
    Ok(MultiLoad::new(
        pool,
        r#"
    SELECT id, product_id, quantity, quantity_unit
    FROM stocks
    WHERE 
    "#,
        " product_id =",
    )
    .load(
        msg.product_ids.len(),
        msg.product_ids.into_iter().map(|id| *id),
        |_e| crate::Error::Stock(Error::ProductStock),
    )
    .await?)
}

#[cfg(test)]
mod tests {
    use config::UpdateConfig;
    use fake::faker::lorem::en as lorem;
    use fake::Fake;
    use model::*;
    use uuid::Uuid;

    pub struct NoOpts;

    impl UpdateConfig for NoOpts {}

    use crate::*;

    async fn test_product(pool: &mut sqlx::Transaction<'_, sqlx::Postgres>) -> Product {
        create_product(
            CreateProduct {
                name: ProductName::new(format!("db stocks test product {}", Uuid::new_v4())),
                short_description: ProductShortDesc::new(lorem::Paragraph(1..2).fake::<String>()),
                long_description: ProductLongDesc::new(lorem::Paragraph(4..5).fake::<String>()),
                category: None,
                price: Price::from_u32(12321),
                deliver_days_flag: Days(vec![Day::Friday, Day::Sunday]),
            },
            pool,
        )
        .await
        .unwrap()
    }

    async fn test_stock(
        pool: &mut sqlx::Transaction<'_, sqlx::Postgres>,
        product_id: Option<ProductId>,
        quantity: Option<Quantity>,
        quantity_unit: Option<QuantityUnit>,
    ) -> Stock {
        let product_id = match product_id {
            Some(id) => id,
            _ => test_product(&mut *pool).await.id,
        };
        let quantity = quantity.unwrap_or_else(|| Quantity::from_u32(345));
        let quantity_unit = quantity_unit.unwrap_or_else(|| QuantityUnit::Piece);

        super::create_stock(
            CreateStock {
                product_id,
                quantity_unit,
                quantity,
            },
            &mut *pool,
        )
        .await
        .unwrap()
    }

    #[actix::test]
    async fn create_stock() {
        let config = config::default_load(&mut NoOpts);
        config
            .lock()
            .database_mut()
            .set_url("postgres://postgres@localhost/bazzar_test");

        let db = Database::build(config).await;
        let pool = db.pool();
        let mut t = pool.begin().await.unwrap();
        test_stock(&mut t, None, None, None).await;
        t.rollback().await.unwrap();
    }

    #[actix::test]
    async fn products_stock() {
        let config = config::default_load(&mut NoOpts);
        config
            .lock()
            .database_mut()
            .set_url("postgres://postgres@localhost/bazzar_test");

        let db = Database::build(config).await;
        let pool = db.pool();
        let mut t = pool.begin().await.unwrap();

        let first = test_stock(&mut t, None, None, None).await;
        let second = test_stock(&mut t, None, None, None).await;

        let stocks: Vec<Stock> = super::product_stock(
            ProductsStock {
                product_ids: vec![first.product_id, second.product_id],
            },
            &mut t,
        )
        .await
        .unwrap();

        t.rollback().await.unwrap();
        assert_eq!(stocks, vec![first, second]);
    }
}