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// Copyright 2023 Greptime Team
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// 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 api::region::RegionResponse;
use api::v1::region::RegionRequest;
use common_error::ext::{BoxedError, ErrorExt, StackError};
use common_error::status_code::StatusCode;
use common_query::request::QueryRequest;
use common_recordbatch::SendableRecordBatchStream;
use common_telemetry::debug;
use snafu::{ResultExt, Snafu};
use tokio::sync::mpsc;

use crate::error::{self, Error, Result};
use crate::peer::Peer;
use crate::test_util::MockDatanodeHandler;

#[async_trait::async_trait]
impl MockDatanodeHandler for () {
    async fn handle(&self, _peer: &Peer, _request: RegionRequest) -> Result<RegionResponse> {
        unreachable!()
    }

    async fn handle_query(
        &self,
        _peer: &Peer,
        _request: QueryRequest,
    ) -> Result<SendableRecordBatchStream> {
        unreachable!()
    }
}

#[derive(Clone)]
pub struct DatanodeWatcher(pub mpsc::Sender<(Peer, RegionRequest)>);

#[async_trait::async_trait]
impl MockDatanodeHandler for DatanodeWatcher {
    async fn handle(&self, peer: &Peer, request: RegionRequest) -> Result<RegionResponse> {
        debug!("Returning Ok(0) for request: {request:?}, peer: {peer:?}");
        self.0.send((peer.clone(), request)).await.unwrap();
        Ok(RegionResponse::new(0))
    }

    async fn handle_query(
        &self,
        _peer: &Peer,
        _request: QueryRequest,
    ) -> Result<SendableRecordBatchStream> {
        unreachable!()
    }
}

#[derive(Clone)]
pub struct RetryErrorDatanodeHandler;

#[async_trait::async_trait]
impl MockDatanodeHandler for RetryErrorDatanodeHandler {
    async fn handle(&self, peer: &Peer, request: RegionRequest) -> Result<RegionResponse> {
        debug!("Returning retry later for request: {request:?}, peer: {peer:?}");
        Err(Error::RetryLater {
            source: BoxedError::new(
                error::UnexpectedSnafu {
                    err_msg: "retry later",
                }
                .build(),
            ),
        })
    }

    async fn handle_query(
        &self,
        _peer: &Peer,
        _request: QueryRequest,
    ) -> Result<SendableRecordBatchStream> {
        unreachable!()
    }
}

#[derive(Clone)]
pub struct UnexpectedErrorDatanodeHandler;

#[async_trait::async_trait]
impl MockDatanodeHandler for UnexpectedErrorDatanodeHandler {
    async fn handle(&self, peer: &Peer, request: RegionRequest) -> Result<RegionResponse> {
        debug!("Returning mock error for request: {request:?}, peer: {peer:?}");
        error::UnexpectedSnafu {
            err_msg: "mock error",
        }
        .fail()
    }

    async fn handle_query(
        &self,
        _peer: &Peer,
        _request: QueryRequest,
    ) -> Result<SendableRecordBatchStream> {
        unreachable!()
    }
}

#[derive(Clone)]
pub struct RequestOutdatedErrorDatanodeHandler;

#[derive(Debug, Snafu)]
#[snafu(display("A mock RequestOutdated error"))]
struct MockRequestOutdatedError;

impl StackError for MockRequestOutdatedError {
    fn debug_fmt(&self, _: usize, _: &mut Vec<String>) {}

    fn next(&self) -> Option<&dyn StackError> {
        None
    }
}

impl ErrorExt for MockRequestOutdatedError {
    fn as_any(&self) -> &dyn std::any::Any {
        self
    }

    fn status_code(&self) -> StatusCode {
        StatusCode::RequestOutdated
    }
}

#[async_trait::async_trait]
impl MockDatanodeHandler for RequestOutdatedErrorDatanodeHandler {
    async fn handle(&self, peer: &Peer, request: RegionRequest) -> Result<RegionResponse> {
        debug!("Returning mock error for request: {request:?}, peer: {peer:?}");
        Err(BoxedError::new(MockRequestOutdatedError)).context(error::ExternalSnafu)
    }

    async fn handle_query(
        &self,
        _peer: &Peer,
        _request: QueryRequest,
    ) -> Result<SendableRecordBatchStream> {
        unreachable!()
    }
}

#[derive(Clone)]
pub struct NaiveDatanodeHandler;

#[async_trait::async_trait]
impl MockDatanodeHandler for NaiveDatanodeHandler {
    async fn handle(&self, peer: &Peer, request: RegionRequest) -> Result<RegionResponse> {
        debug!("Returning Ok(0) for request: {request:?}, peer: {peer:?}");
        Ok(RegionResponse::new(0))
    }

    async fn handle_query(
        &self,
        _peer: &Peer,
        _request: QueryRequest,
    ) -> Result<SendableRecordBatchStream> {
        unreachable!()
    }
}