// SPDX-FileCopyrightText: 2024 Aravinth Manivannan <realaravinth@batsense.net>
//
// SPDX-License-Identifier: AGPL-3.0-or-later

use std::sync::Arc;

use derive_builder::Builder;
use mockall::predicate::*;
use mockall::*;

use super::errors::*;
use crate::ordering::{
    application::port::output::db::{
        customization_id_exists::*, customization_name_exists_for_product::*, product_id_exists::*,
    },
    domain::{
        customization_aggregate::*, customization_updated_event::*, update_customization_command::*,
    },
};
use crate::utils::uuid::*;

#[automock]
#[async_trait::async_trait]
pub trait UpdateCustomizationUseCase: Send + Sync {
    async fn update_customization(
        &self,
        cmd: UpdateCustomizationCommand,
    ) -> OrderingResult<CustomizationUpdatedEvent>;
}

pub type UpdateCustomizationServiceObj = Arc<dyn UpdateCustomizationUseCase>;

#[derive(Clone, Builder)]
pub struct UpdateCustomizationService {
    // TODO: check if product ID exists
    db_customization_name_exists_for_product: CustomizationNameExistsForProductDBPortObj,
    db_customization_id_exists: CustomizationIDExistsDBPortObj,
    db_product_id_exists: ProductIDExistsDBPortObj,
}

#[async_trait::async_trait]
impl UpdateCustomizationUseCase for UpdateCustomizationService {
    async fn update_customization(
        &self,
        cmd: UpdateCustomizationCommand,
    ) -> OrderingResult<CustomizationUpdatedEvent> {
        if !self
            .db_customization_id_exists
            .customization_id_exists(cmd.old_customization().customization_id())
            .await?
        {
            return Err(OrderingError::CustomizationIDNotFound);
        }

        if !self
            .db_product_id_exists
            .product_id_exists(cmd.old_customization().product_id())
            .await?
        {
            return Err(OrderingError::ProductIDNotFound);
        }

        let updated_customization = CustomizationBuilder::default()
            .name(cmd.name().into())
            .product_id(*cmd.old_customization().product_id())
            .customization_id(*cmd.old_customization().customization_id())
            .deleted(*cmd.old_customization().deleted())
            .build()
            .unwrap();

        if updated_customization.name() != cmd.old_customization().name() {
            if self
                .db_customization_name_exists_for_product
                .customization_name_exists_for_product(&updated_customization)
                .await?
            {
                return Err(OrderingError::DuplicateCustomizationName);
            }
        }

        Ok(CustomizationUpdatedEventBuilder::default()
            .added_by_user(*cmd.adding_by())
            .old_customization(cmd.old_customization().clone())
            .new_customization(updated_customization)
            .build()
            .unwrap())
    }
}

#[cfg(test)]
pub mod tests {
    use super::*;

    use crate::ordering::domain::customization_updated_event;
    use crate::ordering::domain::update_customization_command::tests::get_update_customization_command;
    use crate::tests::bdd::*;

    pub fn mock_update_customization_service(
        times: Option<usize>,
        cmd: UpdateCustomizationCommand,
    ) -> UpdateCustomizationServiceObj {
        let mut m = MockUpdateCustomizationUseCase::new();

        let res =
            customization_updated_event::tests::get_customization_updated_event_from_command(&cmd);

        if let Some(times) = times {
            m.expect_update_customization()
                .times(times)
                .returning(move |_| Ok(res.clone()));
        } else {
            m.expect_update_customization()
                .returning(move |_| Ok(res.clone()));
        }

        Arc::new(m)
    }

    #[actix_rt::test]
    async fn test_service() {
        let cmd = get_update_customization_command();

        let s = UpdateCustomizationServiceBuilder::default()
            .db_product_id_exists(mock_product_id_exists_db_port_true(IS_CALLED_ONLY_ONCE))
            .db_customization_name_exists_for_product(
                mock_customization_name_exists_for_product_db_port_false(IS_CALLED_ONLY_ONCE),
            )
            .db_customization_id_exists(mock_customization_id_exists_db_port_true(
                IS_CALLED_ONLY_ONCE,
            ))
            .build()
            .unwrap();

        let res = s.update_customization(cmd.clone()).await.unwrap();
        assert_eq!(res.new_customization().name(), cmd.name());
        assert_eq!(
            res.new_customization().product_id(),
            cmd.old_customization().product_id()
        );
        assert_eq!(
            res.new_customization().customization_id(),
            cmd.old_customization().customization_id()
        );
        assert_eq!(res.old_customization(), cmd.old_customization());
        assert_eq!(res.added_by_user(), cmd.adding_by());
    }

    #[actix_rt::test]
    async fn test_service_product_doesnt_exist() {
        let cmd = get_update_customization_command();

        let s = UpdateCustomizationServiceBuilder::default()
            .db_product_id_exists(mock_product_id_exists_db_port_false(IS_CALLED_ONLY_ONCE))
            .db_customization_name_exists_for_product(
                mock_customization_name_exists_for_product_db_port_false(IS_NEVER_CALLED),
            )
            .db_customization_id_exists(mock_customization_id_exists_db_port_true(
                IS_CALLED_ONLY_ONCE,
            ))
            .build()
            .unwrap();

        assert_eq!(
            s.update_customization(cmd.clone()).await,
            Err(OrderingError::ProductIDNotFound)
        );
    }

    #[actix_rt::test]
    async fn test_customization_id_not_found() {
        let cmd = get_update_customization_command();

        let s = UpdateCustomizationServiceBuilder::default()
            .db_product_id_exists(mock_product_id_exists_db_port_true(IS_NEVER_CALLED))
            .db_customization_name_exists_for_product(
                mock_customization_name_exists_for_product_db_port_false(IS_NEVER_CALLED),
            )
            .db_customization_id_exists(mock_customization_id_exists_db_port_false(
                IS_CALLED_ONLY_ONCE,
            ))
            .build()
            .unwrap();

        assert_eq!(
            s.update_customization(cmd.clone()).await,
            Err(OrderingError::CustomizationIDNotFound)
        );
    }

    #[actix_rt::test]
    async fn test_duplicate_new_name() {
        let cmd = get_update_customization_command();

        let s = UpdateCustomizationServiceBuilder::default()
            .db_product_id_exists(mock_product_id_exists_db_port_true(IS_CALLED_ONLY_ONCE))
            .db_customization_name_exists_for_product(
                mock_customization_name_exists_for_product_db_port_true(IS_CALLED_ONLY_ONCE),
            )
            .db_customization_id_exists(mock_customization_id_exists_db_port_true(
                IS_CALLED_ONLY_ONCE,
            ))
            .build()
            .unwrap();

        assert_eq!(
            s.update_customization(cmd.clone()).await,
            Err(OrderingError::DuplicateCustomizationName)
        );
    }
}