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

use super::*;

pub use dynamo_llm::block_manager::controller::client::ControlClient;
pub use dynamo_llm::block_manager::controller::{CacheLevel, Controller};

#[pyclass]
pub struct BlockManagerClient {
    inner: ControlClient,
}

#[pymethods]
impl BlockManagerClient {
    #[new]
    fn new(component: Component, instance_id: i64) -> PyResult<Self> {
        let client = pyo3_async_runtimes::tokio::get_runtime()
            .block_on(ControlClient::new(component.inner, instance_id))
            .map_err(to_pyerr)?;
        Ok(BlockManagerClient { inner: client })
    }

    fn reset_pool(&self, cache_level: String) -> PyResult<()> {
        let cache_level = Self::cache_level_from_str(&cache_level).map_err(to_pyerr)?;
        pyo3_async_runtimes::tokio::get_runtime()
            .block_on(self.inner.reset_pool(cache_level))
            .map_err(to_pyerr)
    }

    fn reset_blocks(&self, cache_level: String, blocks: Vec<u64>) -> PyResult<ResetBlocksResponse> {
        let cache_level = Self::cache_level_from_str(&cache_level).map_err(to_pyerr)?;
        let response = pyo3_async_runtimes::tokio::get_runtime()
            .block_on(self.inner.reset_blocks(cache_level, blocks))
            .map_err(to_pyerr)?;
        Ok(ResetBlocksResponse { inner: response })
    }

    fn status(&self, cache_level: String) -> PyResult<BlockPoolStatus> {
        let cache_level = Self::cache_level_from_str(&cache_level).map_err(to_pyerr)?;
        let status = pyo3_async_runtimes::tokio::get_runtime()
            .block_on(self.inner.status(cache_level))
            .map_err(to_pyerr)?;
        Ok(BlockPoolStatus { inner: status })
    }

    fn reset_all_pools(&self) -> PyResult<()> {
        pyo3_async_runtimes::tokio::get_runtime()
            .block_on(self.inner.reset_all_pools())
            .map_err(to_pyerr)
    }
}

impl BlockManagerClient {
    // convert string to cache level
    fn cache_level_from_str(cache_level: &str) -> anyhow::Result<CacheLevel> {
        match cache_level.to_uppercase().as_str() {
            "G1" => Ok(CacheLevel::G1),
            "G2" => Ok(CacheLevel::G2),
            "G3" => Ok(CacheLevel::G3),
            _ => anyhow::bail!("Invalid cache level: allowed values are G1, G2, G3"),
        }
    }
}

#[pyclass]
#[derive(Clone)]
pub struct BlockPoolStatus {
    inner: dynamo_llm::block_manager::pool::BlockPoolStatus,
}

#[pymethods]
impl BlockPoolStatus {
    fn active_blocks(&self) -> usize {
        self.inner.active_blocks
    }

    fn inactive_blocks(&self) -> usize {
        self.inner.inactive_blocks
    }

    fn empty_blocks(&self) -> usize {
        self.inner.empty_blocks
    }
}

#[pyclass]
pub struct ResetBlocksResponse {
    inner: dynamo_llm::block_manager::pool::ResetBlocksResponse,
}

#[pymethods]
impl ResetBlocksResponse {
    fn reset_blocks(&self) -> Vec<u64> {
        self.inner.reset_blocks.clone()
    }

    fn not_found_blocks(&self) -> Vec<u64> {
        self.inner.not_found.clone()
    }

    fn not_reset_blocks(&self) -> Vec<u64> {
        self.inner.not_reset.clone()
    }
}