// SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
// SPDX-License-Identifier: Apache-2.0

use derive_getters::Getters;
use serde::{Deserialize, Serialize};

use crate::block_manager::connector::protocol::LeaderTransferRequest;

pub const ZMQ_PING_MESSAGE: &str = "ping";
pub const ZMQ_WORKER_METADATA_MESSAGE: &str = "worker_metadata";
pub const ZMQ_LEADER_METADATA_MESSAGE: &str = "leader_metadata";
pub const ZMQ_TRANSFER_BLOCKS_MESSAGE: &str = "transfer_blocks";

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct WorkerMetadata {
    pub num_device_blocks: usize,
    pub bytes_per_block: usize,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct LeaderMetadata {
    pub num_host_blocks: usize,
    pub num_disk_blocks: usize,
}

#[derive(Serialize, Deserialize, Debug, Clone, PartialEq, Eq, Copy)]
pub enum BlockTransferPool {
    Device,
    Host,
    Disk,
}

#[derive(Serialize, Deserialize, Debug, Clone)]
pub enum ConnectorTransferType {
    Store,
    Load,
}

#[derive(Serialize, Deserialize, Debug, Clone)]
pub struct ConnectorRequestLeader {
    pub req_id: String,
    pub txn_id: u64,
    pub transfer_type: ConnectorTransferType,
}

#[derive(Serialize, Deserialize, Debug, Getters, Clone)]
pub struct BlockTransferRequest {
    pub from_pool: BlockTransferPool,
    pub to_pool: BlockTransferPool,
    pub blocks: Vec<(usize, usize)>,

    #[serde(skip_serializing_if = "Option::is_none")]
    pub connector_req: Option<LeaderTransferRequest>,
}

impl BlockTransferRequest {
    #[allow(dead_code)]
    pub fn new(
        from_pool: BlockTransferPool,
        to_pool: BlockTransferPool,
        blocks: Vec<(usize, usize)>,
    ) -> Self {
        Self {
            from_pool,
            to_pool,
            blocks,
            connector_req: None,
        }
    }

    pub fn new_with_trigger_id(
        from_pool: BlockTransferPool,
        to_pool: BlockTransferPool,
        blocks: Vec<(usize, usize)>,
        connector_req: LeaderTransferRequest,
    ) -> Self {
        Self {
            from_pool,
            to_pool,
            blocks,
            connector_req: Some(connector_req),
        }
    }
}
