// Copyright 2024 RustFS 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 rustfs_io_metrics::internode_metrics::{
    INTERNODE_MSGPACK_CODEC_JSON, INTERNODE_MSGPACK_CODEC_MSGPACK, INTERNODE_MSGPACK_DIRECTION_RESPONSE,
    INTERNODE_OPERATION_GRPC_READ_ALL, INTERNODE_OPERATION_GRPC_READ_MULTIPLE, INTERNODE_OPERATION_GRPC_READ_VERSION,
    INTERNODE_OPERATION_GRPC_WRITE_ALL, INTERNODE_OPERATION_PUT_FILE_STREAM, INTERNODE_OPERATION_READ_FILE_STREAM,
    INTERNODE_TRANSPORT_BACKEND_GRPC, INTERNODE_TRANSPORT_BACKEND_TCP_HTTP, global_internode_metrics,
};
use std::time::Duration;

#[cfg(test)]
use rustfs_io_metrics::internode_metrics::InternodeMetricsSnapshot;

pub(crate) fn record_remote_disk_open_write_retry(classification: &'static str) {
    global_internode_metrics().record_retry_for_operation_and_backend(
        INTERNODE_OPERATION_PUT_FILE_STREAM,
        INTERNODE_TRANSPORT_BACKEND_TCP_HTTP,
        classification,
    );
}

pub(crate) fn record_remote_disk_open_write_retry_success(classification: &'static str) {
    global_internode_metrics().record_retry_success_for_operation_and_backend(
        INTERNODE_OPERATION_PUT_FILE_STREAM,
        INTERNODE_TRANSPORT_BACKEND_TCP_HTTP,
        classification,
    );
}

pub(crate) fn record_remote_disk_open_read_retry(classification: &'static str) {
    global_internode_metrics().record_retry_for_operation_and_backend(
        INTERNODE_OPERATION_READ_FILE_STREAM,
        INTERNODE_TRANSPORT_BACKEND_TCP_HTTP,
        classification,
    );
}

pub(crate) fn record_remote_disk_open_read_retry_success(classification: &'static str) {
    global_internode_metrics().record_retry_success_for_operation_and_backend(
        INTERNODE_OPERATION_READ_FILE_STREAM,
        INTERNODE_TRANSPORT_BACKEND_TCP_HTTP,
        classification,
    );
}

pub(crate) fn record_remote_disk_grpc_write_all_error() {
    global_internode_metrics()
        .record_error_for_operation_and_backend(INTERNODE_OPERATION_GRPC_WRITE_ALL, INTERNODE_TRANSPORT_BACKEND_GRPC);
}

pub(crate) fn record_remote_disk_grpc_write_all_request() {
    global_internode_metrics()
        .record_outgoing_request_for_operation_and_backend(INTERNODE_OPERATION_GRPC_WRITE_ALL, INTERNODE_TRANSPORT_BACKEND_GRPC);
}

pub(crate) fn record_remote_disk_grpc_write_all_sent_bytes(bytes: usize) {
    global_internode_metrics().record_sent_bytes_for_operation_and_backend(
        INTERNODE_OPERATION_GRPC_WRITE_ALL,
        INTERNODE_TRANSPORT_BACKEND_GRPC,
        bytes,
    );
}

pub(crate) fn record_remote_disk_grpc_read_all_error() {
    global_internode_metrics()
        .record_error_for_operation_and_backend(INTERNODE_OPERATION_GRPC_READ_ALL, INTERNODE_TRANSPORT_BACKEND_GRPC);
}

pub(crate) fn record_remote_disk_grpc_read_all_request() {
    global_internode_metrics()
        .record_outgoing_request_for_operation_and_backend(INTERNODE_OPERATION_GRPC_READ_ALL, INTERNODE_TRANSPORT_BACKEND_GRPC);
}

pub(crate) fn record_remote_disk_grpc_read_version_request() {
    if !rustfs_io_metrics::get_stage_metrics_enabled() {
        return;
    }
    global_internode_metrics().record_outgoing_request_for_operation_and_backend(
        INTERNODE_OPERATION_GRPC_READ_VERSION,
        INTERNODE_TRANSPORT_BACKEND_GRPC,
    );
}

pub(crate) fn record_remote_disk_grpc_read_version_error() {
    if !rustfs_io_metrics::get_stage_metrics_enabled() {
        return;
    }
    global_internode_metrics()
        .record_error_for_operation_and_backend(INTERNODE_OPERATION_GRPC_READ_VERSION, INTERNODE_TRANSPORT_BACKEND_GRPC);
}

pub(crate) fn record_remote_disk_grpc_read_version_sent_bytes(bytes: usize) {
    if !rustfs_io_metrics::get_stage_metrics_enabled() {
        return;
    }
    global_internode_metrics().record_sent_bytes_for_operation_and_backend(
        INTERNODE_OPERATION_GRPC_READ_VERSION,
        INTERNODE_TRANSPORT_BACKEND_GRPC,
        bytes,
    );
}

pub(crate) fn record_remote_disk_grpc_read_version_recv_bytes(bytes: usize) {
    if !rustfs_io_metrics::get_stage_metrics_enabled() {
        return;
    }
    global_internode_metrics().record_recv_bytes_for_operation_and_backend(
        INTERNODE_OPERATION_GRPC_READ_VERSION,
        INTERNODE_TRANSPORT_BACKEND_GRPC,
        bytes,
    );
    record_grpc_payload_size(INTERNODE_OPERATION_GRPC_READ_VERSION, bytes);
}

pub(crate) fn record_remote_disk_grpc_read_version_stage(stage: &'static str, duration: Duration) {
    if !rustfs_io_metrics::get_stage_metrics_enabled() {
        return;
    }
    global_internode_metrics().record_stage_duration_for_operation_and_backend(
        INTERNODE_OPERATION_GRPC_READ_VERSION,
        INTERNODE_TRANSPORT_BACKEND_GRPC,
        stage,
        duration,
    );
}

pub(crate) fn record_remote_disk_grpc_read_all_recv_bytes(bytes: usize) {
    global_internode_metrics().record_recv_bytes_for_operation_and_backend(
        INTERNODE_OPERATION_GRPC_READ_ALL,
        INTERNODE_TRANSPORT_BACKEND_GRPC,
        bytes,
    );
    record_grpc_payload_size(INTERNODE_OPERATION_GRPC_READ_ALL, bytes);
}

pub(crate) fn record_remote_disk_grpc_read_multiple_recv_bytes(bytes: usize) {
    global_internode_metrics().record_recv_bytes_for_operation_and_backend(
        INTERNODE_OPERATION_GRPC_READ_MULTIPLE,
        INTERNODE_TRANSPORT_BACKEND_GRPC,
        bytes,
    );
    record_grpc_payload_size(INTERNODE_OPERATION_GRPC_READ_MULTIPLE, bytes);
}

/// Payload-size threshold (bytes) above which a unary internode gRPC response is counted as a
/// "large payload" for alerting. Env-overridable via `RUSTFS_INTERNODE_RPC_LARGE_PAYLOAD_WARN_BYTES`.
fn internode_rpc_large_payload_warn_bytes() -> usize {
    rustfs_utils::get_env_usize(
        rustfs_config::ENV_INTERNODE_RPC_LARGE_PAYLOAD_WARN_BYTES,
        rustfs_config::DEFAULT_INTERNODE_RPC_LARGE_PAYLOAD_WARN_BYTES,
    )
}

/// Record the payload size of a completed unary gRPC RPC into the operation histogram, and
/// flag it as a large payload when it crosses the configured threshold. This instrumentation
/// sizes which `bytes`-carrying RPCs contend with latency-sensitive control-plane traffic on
/// the shared channel, feeding the P1 channel-isolation decision (see docs/grpc-optimization).
fn record_grpc_payload_size(operation: &'static str, bytes: usize) {
    let metrics = global_internode_metrics();
    metrics.record_operation_payload_bytes(operation, INTERNODE_TRANSPORT_BACKEND_GRPC, bytes);
    if bytes >= internode_rpc_large_payload_warn_bytes() {
        metrics.record_large_operation_payload(operation, INTERNODE_TRANSPORT_BACKEND_GRPC);
    }
}

/// Count a client-side response decode that fell back to the JSON compatibility field because the
/// msgpack `_bin` payload was absent (grpc-optimization P2). `message` is the value name.
pub(crate) fn record_response_json_fallback(message: &'static str) {
    global_internode_metrics().record_msgpack_json_fallback(INTERNODE_MSGPACK_DIRECTION_RESPONSE, message);
}

pub(crate) fn record_response_msgpack_decode(message: &'static str) {
    global_internode_metrics().record_msgpack_json_decode(
        INTERNODE_MSGPACK_DIRECTION_RESPONSE,
        message,
        INTERNODE_MSGPACK_CODEC_MSGPACK,
    );
}

pub(crate) fn record_response_json_decode(message: &'static str) {
    global_internode_metrics().record_msgpack_json_decode(
        INTERNODE_MSGPACK_DIRECTION_RESPONSE,
        message,
        INTERNODE_MSGPACK_CODEC_JSON,
    );
}

pub(crate) fn record_response_msgpack_decode_error(message: &'static str) {
    global_internode_metrics().record_msgpack_json_decode_error(
        INTERNODE_MSGPACK_DIRECTION_RESPONSE,
        message,
        INTERNODE_MSGPACK_CODEC_MSGPACK,
    );
}

pub(crate) fn record_response_json_decode_error(message: &'static str) {
    global_internode_metrics().record_msgpack_json_decode_error(
        INTERNODE_MSGPACK_DIRECTION_RESPONSE,
        message,
        INTERNODE_MSGPACK_CODEC_JSON,
    );
}

#[cfg(test)]
pub(crate) fn reset_internode_metrics_for_test() {
    global_internode_metrics().reset_for_test();
}

#[cfg(test)]
pub(crate) fn internode_metrics_snapshot_for_test() -> InternodeMetricsSnapshot {
    global_internode_metrics().snapshot()
}

#[cfg(test)]
pub(crate) fn internode_msgpack_json_decode_error_total_for_test() -> u64 {
    global_internode_metrics().msgpack_json_decode_error_total_for_test()
}