// Copyright 2024 The NativeLink Authors. All rights reserved.

//

// Licensed under the Functional Source License, Version 1.1, Apache 2.0 Future License (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//    See LICENSE file for details

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

use std::sync::Arc;

use async_trait::async_trait;

use nativelink_error::{Error, make_input_err};

use nativelink_metric::{MetricsComponent, RootMetricsComponent};

use nativelink_util::action_messages::{ActionInfo, OperationId};

use nativelink_util::known_platform_property_provider::KnownPlatformPropertyProvider;

use nativelink_util::operation_state_manager::{

    ActionStateResult, ActionStateResultStream, ClientStateManager, OperationFilter,

};

use tokio::sync::{Mutex, mpsc};

#[allow(

    clippy::large_enum_variant,

    reason = "Testing, so this doesn't really matter. Doesn't trigger on nightly"

)]

#[allow(dead_code, reason = "https://github.com/rust-lang/rust/issues/46379")]

enum ActionSchedulerCalls {

    GetGetKnownProperties(String),

    AddAction((OperationId, ActionInfo)),

    FilterOperations(OperationFilter),

}

#[allow(dead_code, reason = "https://github.com/rust-lang/rust/issues/46379")]

enum ActionSchedulerReturns {

    GetGetKnownProperties(Result<Vec<String>, Error>),

    AddAction(Result<Box<dyn ActionStateResult>, Error>),

    FilterOperations(Result<ActionStateResultStream<'static>, Error>),

}

#[derive(MetricsComponent, Debug)]

pub struct MockActionScheduler {

    rx_call: Mutex<mpsc::UnboundedReceiver<ActionSchedulerCalls>>,

    tx_call: mpsc::UnboundedSender<ActionSchedulerCalls>,

    rx_resp: Mutex<mpsc::UnboundedReceiver<ActionSchedulerReturns>>,

    tx_resp: mpsc::UnboundedSender<ActionSchedulerReturns>,

}

impl Default for MockActionScheduler {

    fn default() -> Self {

        Self::new()

    }

}

impl MockActionScheduler {

    pub fn new() -> Self {

        let (tx_call, rx_call) = mpsc::unbounded_channel();

        let (tx_resp, rx_resp) = mpsc::unbounded_channel();

        Self {

            rx_call: Mutex::new(rx_call),

            tx_call,

            rx_resp: Mutex::new(rx_resp),

            tx_resp,

        }

    }

    #[allow(dead_code, reason = "https://github.com/rust-lang/rust/issues/46379")]

    pub async fn expect_get_known_properties(&self, result: Result<Vec<String>, Error>) -> String {

        let mut rx_call_lock = self.rx_call.lock().await;

        let ActionSchedulerCalls::GetGetKnownProperties(req) = rx_call_lock

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            .recv()

            .await

            .expect("Could not receive msg in mpsc")

        else {

            panic!("Got incorrect call waiting for get_known_properties")

        };

        self.tx_resp

            .send(ActionSchedulerReturns::GetGetKnownProperties(result))

            .map_err(|_| make_input_err!("Could not send request to mpsc"))

            .unwrap();

        req

    }

    #[allow(dead_code, reason = "https://github.com/rust-lang/rust/issues/46379")]

    pub async fn expect_add_action(

        &self,

        result: Result<Box<dyn ActionStateResult>, Error>,

    ) -> (OperationId, ActionInfo) {

        let mut rx_call_lock = self.rx_call.lock().await;

        let ActionSchedulerCalls::AddAction(req) = rx_call_lock

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            .recv()

            .await

            .expect("Could not receive msg in mpsc")

        else {

            panic!("Got incorrect call waiting for get_known_properties")

        };

        self.tx_resp

            .send(ActionSchedulerReturns::AddAction(result))

            .map_err(|_| make_input_err!("Could not send request to mpsc"))

            .unwrap();

        req

    }

    #[allow(dead_code, reason = "https://github.com/rust-lang/rust/issues/46379")]

    pub async fn expect_filter_operations(

        &self,

        result: Result<ActionStateResultStream<'static>, Error>,

    ) -> OperationFilter {

        let mut rx_call_lock = self.rx_call.lock().await;

        let ActionSchedulerCalls::FilterOperations(req) = rx_call_lock

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            .recv()

            .await

            .expect("Could not receive msg in mpsc")

        else {

            panic!("Got incorrect call waiting for find_by_client_operation_id")

        };

        self.tx_resp

            .send(ActionSchedulerReturns::FilterOperations(result))

            .map_err(|_| make_input_err!("Could not send request to mpsc"))

            .unwrap();

        req

    }

}

#[async_trait]

impl KnownPlatformPropertyProvider for MockActionScheduler {

    async fn get_known_properties(&self, instance_name: &str) -> Result<Vec<String>, Error> {

        self.tx_call

            .send(ActionSchedulerCalls::GetGetKnownProperties(

                instance_name.to_string(),

            ))

            .expect("Could not send request to mpsc");

        let mut rx_resp_lock = self.rx_resp.lock().await;

        match rx_resp_lock

            .recv()

            .await

            .expect("Could not receive msg in mpsc")

        {

            ActionSchedulerReturns::GetGetKnownProperties(result) => result,

            _ => panic!("Expected get_known_properties return value"),

        }

    }

}

#[async_trait]

impl ClientStateManager for MockActionScheduler {

    async fn add_action(

        &self,

        client_operation_id: OperationId,

        action_info: Arc<ActionInfo>,

    ) -> Result<Box<dyn ActionStateResult>, Error> {

        self.tx_call

            .send(ActionSchedulerCalls::AddAction((

                client_operation_id,

                action_info.as_ref().clone(),

            )))

            .expect("Could not send request to mpsc");

        let mut rx_resp_lock = self.rx_resp.lock().await;

        match rx_resp_lock

            .recv()

            .await

            .expect("Could not receive msg in mpsc")

        {

            ActionSchedulerReturns::AddAction(result) => result,

            _ => panic!("Expected add_action return value"),

        }

    }

    async fn filter_operations<'a>(

        &'a self,

        filter: OperationFilter,

    ) -> Result<ActionStateResultStream<'a>, Error> {

        self.tx_call

            .send(ActionSchedulerCalls::FilterOperations(filter))

            .expect("Could not send request to mpsc");

        let mut rx_resp_lock = self.rx_resp.lock().await;

        match rx_resp_lock

            .recv()

            .await

            .expect("Could not receive msg in mpsc")

        {

            ActionSchedulerReturns::FilterOperations(result) => result,

            _ => panic!("Expected find_by_client_operation_id return value"),

        }

    }

    fn as_known_platform_property_provider(&self) -> Option<&dyn KnownPlatformPropertyProvider> {

        Some(self)

    }

}

impl RootMetricsComponent for MockActionScheduler {}