//! An agent store is a standard HDF5 file: h5py can open it and read every
//! dataset.
//!
//! It could not: the float datatype's sign-bit position was hard-coded for
//! f64, so every f32 dataset (embeddings, norms, activation weights) made
//! libhdf5 refuse the file with "sign bit position out of bounds".

use std::process::Command;

use clawhdf5_agent::{AgentMemory, HDF5Memory, MemoryConfig, MemoryEntry};

fn python() -> String {
    std::env::var("CLAWHDF5_PYTHON").unwrap_or_else(|_| "python3".to_string())
}

fn h5py_available() -> bool {
    Command::new(python())
        .args(["-c", "import h5py"])
        .output()
        .map(|o| o.status.success())
        .unwrap_or(false)
}

#[test]
fn h5py_reads_every_dataset_of_an_agent_store() {
    if !h5py_available() {
        assert!(
            std::env::var("CLAWHDF5_REQUIRE_INTEROP").as_deref() != Ok("1"),
            "CLAWHDF5_REQUIRE_INTEROP=1 but python3 with h5py is not available"
        );
        eprintln!("SKIP: python3 with h5py not available");
        return;
    }
    let dir = tempfile::tempdir().unwrap();
    for float16 in [false, true] {
        let path = dir.path().join(format!("store_{float16}.h5"));
        let mut cfg = MemoryConfig::new(path.clone(), "agent", 8);
        cfg.float16 = float16;
        let mut m = HDF5Memory::create(cfg).unwrap();
        // save_batch checkpoints, so the records are in the .h5, not the WAL.
        m.save_batch(
            (0..20)
                .map(|i| MemoryEntry {
                    chunk: format!("memory {i}"),
                    embedding: (0..8).map(|j| ((i * 8 + j) as f32).sin()).collect(),
                    source_channel: "test".into(),
                    timestamp: i as f64,
                    session_id: "s".into(),
                    tags: String::new(),
                })
                .collect(),
        )
        .unwrap();
        drop(m);

        // Exact expected values, as bits: numpy's sin need not match Rust's
        // to the last place.
        let bits = (0..160)
            .map(|k| (k as f32).sin().to_bits().to_string())
            .collect::<Vec<_>>()
            .join(",");
        let script = format!(
            r#"
import h5py, numpy as np
want = np.float16 if {py_bool} else np.float32
with h5py.File("{path}", "r") as f:
    names = []
    f.visititems(lambda n, o: names.append(n) if isinstance(o, h5py.Dataset) else None)
    for n in names:
        f[n][()]  # every dataset must decode
    e = f["memory/embeddings"]
    assert e.dtype == want, e.dtype
    assert e.shape == (20, 8), e.shape
    ref = np.array([{bits}], dtype=np.uint32).view(np.float32).astype(want).reshape(20, 8)
    assert (e[()] == ref).all()
    assert f["memory/norms"].dtype == np.float32
print(len(names))
"#,
            py_bool = if float16 { "True" } else { "False" },
            path = path.display()
        );
        let out = Command::new(python())
            .args(["-c", &script])
            .output()
            .unwrap();
        assert!(
            out.status.success(),
            "float16={float16}: {}",
            String::from_utf8_lossy(&out.stderr)
        );
        let n: usize = String::from_utf8_lossy(&out.stdout).trim().parse().unwrap();
        assert!(n >= 10, "only {n} datasets");
    }
}