NeuralAmpModeler-rs 3.0.2

// SPDX-License-Identifier: Apache-2.0
// Copyright (c) 2026 Fábio Henrique de Lima Silva (fhl.bsb@gmail.com) All rights reserved.

//! Shared test helpers for CLAP integration tests and benchmarks.
//!
//! Consolidates ~700 lines of boilerplate extracted from `processor_test.rs`
//! and reusable by `inference_bench.rs`.

#![allow(missing_docs)]

use crate::clap::NamClapPlugin;
use crate::common::params::NamPluginParams;
use crate::dsp::pipeline::test_util::infra::{TrackingGuard, get_alloc_count};
use clack_extensions::state::PluginState;
use clack_host::prelude::*;
use std::path::PathBuf;
use std::sync::Arc;

// ── Test host mocks ──

pub struct TestHostShared;
impl<'a> SharedHandler<'a> for TestHostShared {
    fn request_restart(&self) {}
    fn request_process(&self) {}
    fn request_callback(&self) {}
}

pub struct TestHost;
impl HostHandlers for TestHost {
    type Shared<'a> = TestHostShared;
    type MainThread<'a> = ();
    type AudioProcessor<'a> = ();
}

// ── Plugin bootstrap ──

/// Creates a fully initialized CLAP plugin entry, host info, and instance.
/// Returns all three pieces as a tuple — the caller must keep them alive
/// together (destructure with `let (_entry, _host, mut instance) = ...`).
pub fn make_test_plugin() -> (PluginEntry, HostInfo, PluginInstance<TestHost>) {
    let entry =
        PluginEntry::load_from_clack::<clack_plugin::entry::SinglePluginEntry<NamClapPlugin>>(
            c"/test",
        )
        .expect("Failed to load PluginEntry");

    let host_info = HostInfo::new("Test", "Test", "Test", "0.1.0").unwrap();

    let instance = PluginInstance::<TestHost>::new(
        |_| TestHostShared,
        |_| (),
        &entry,
        c"br.eti.fabiolima.nam-rs",
        &host_info,
    )
    .expect("Failed to instantiate plugin");

    (entry, host_info, instance)
}

/// Creates a fully initialized CLAP plugin entry, host info, and instance
/// by loading the plugin dynamically from a shared library (`.so`) at `so_path`.
///
/// Uses [`PluginEntry::load`] under the hood, which is inherently unsafe
/// because it executes code from an external dynamic library.
pub fn make_test_plugin_dynamic(
    so_path: &std::path::Path,
) -> (PluginEntry, HostInfo, PluginInstance<TestHost>) {
    let entry = unsafe { PluginEntry::load(so_path) }.expect("Failed to load PluginEntry from .so");

    let host_info = HostInfo::new("Test", "Test", "Test", "0.1.0").unwrap();

    let instance = PluginInstance::<TestHost>::new(
        |_| TestHostShared,
        |_| (),
        &entry,
        c"br.eti.fabiolima.nam-rs",
        &host_info,
    )
    .expect("Failed to instantiate plugin");

    (entry, host_info, instance)
}

// ── Default NamPluginParams ──

/// Creates `NamPluginParams` with test-friendly defaults (all zeros/off)
/// and an optional model path.
pub fn make_default_params(model_path: Option<PathBuf>) -> NamPluginParams {
    NamPluginParams {
        model_path,
        ..Default::default()
    }
}

// ── Shared pointer extraction ──

/// Extracts a raw pointer to `NamClapShared` from a `PluginInstance<TestHost>`.
///
/// The caller should dereference this with `unsafe { &*ptr }` and ensure
/// the `PluginInstance` outlives the dereferenced reference.
pub fn extract_shared(
    instance: &mut PluginInstance<TestHost>,
) -> *const crate::clap::plugin::NamClapShared {
    let raw_ptr = instance.plugin_handle().as_raw_ptr();
    unsafe {
        clack_plugin::extensions::wrapper::PluginWrapper::<NamClapPlugin>::handle(
            raw_ptr,
            |wrapper| Ok(wrapper.shared() as *const crate::clap::plugin::NamClapShared),
        )
    }
    .expect("Failed to get plugin wrapper")
}

// ── State loading ──

/// Gets the `PluginState` extension and loads `params` (serialized as JSON).
pub fn get_state_ext(
    instance: &mut PluginInstance<TestHost>,
) -> clack_extensions::state::PluginState {
    instance
        .plugin_handle()
        .get_extension::<PluginState>()
        .expect("State extension not found")
}

/// Serializes `params` to JSON and loads it into the plugin via `PluginState::load`.
pub fn load_plugin_state(instance: &mut PluginInstance<TestHost>, params: &NamPluginParams) {
    let state_ext = get_state_ext(instance);
    let state_bytes = serde_json::to_vec(params).unwrap();
    let mut handle = instance.plugin_handle();
    state_ext
        .load(&mut handle, &mut state_bytes.as_slice())
        .expect("Failed to load state");
}

// ── Logger verification helpers ──

/// Snapshots the global `LogBuffer` and asserts it contains a message
/// matching `expected`. Returns the full snapshot for further inspection.
pub fn assert_log_buffer_contains(expected: &str) {
    let buffer = crate::common::diagnostics::logger::NamLogger::log_buffer()
        .expect("NamLogger::log_buffer() should return Some after plugin init");
    let snapshot = buffer.snapshot();
    let found = snapshot.iter().any(|r| r.message.contains(expected));
    if !found {
        let all_messages: Vec<_> = snapshot.iter().map(|r| &r.message).collect();
        panic!("LogBuffer does not contain '{expected}'.\nRecent log messages:\n{all_messages:#?}");
    }
}

/// Registers a test sink on the global `NamLogger` and returns reference holders.
///
/// Returns `(captured_messages, sink_arc)` where:
/// - `captured_messages` is a shared `Vec<(String, String)>` of (severity, message) pairs
/// - `sink_arc` must be kept alive for the `Weak` reference to remain valid
pub type TestSinkCapture = Arc<std::sync::Mutex<Vec<(String, String)>>>;
pub type TestSink = Arc<crate::common::diagnostics::logger::HostLogFn>;

pub fn register_test_sink() -> (TestSinkCapture, TestSink) {
    let captured: Arc<std::sync::Mutex<Vec<(String, String)>>> =
        Arc::new(std::sync::Mutex::new(Vec::new()));
    let cap = Arc::clone(&captured);
    let sink: Arc<crate::common::diagnostics::logger::HostLogFn> =
        Arc::new(move |severity: &str, msg: &str| {
            if let Ok(mut v) = cap.lock() {
                v.push((severity.to_string(), msg.to_string()));
            }
        });
    let logger = crate::common::diagnostics::logger::NamLogger::global()
        .expect("NamLogger::global() should be Some after plugin init");
    logger.register_sink(&sink);
    (captured, sink)
}

/// Runs `f` with allocation tracking enabled and asserts no allocations occurred.
/// `label` identifies the test context in the failure message.
pub fn assert_zero_alloc<F: FnOnce()>(label: &str, f: F) {
    let _guard = TrackingGuard::new();
    let before = get_alloc_count();
    f();
    let after = get_alloc_count();
    assert_eq!(
        after - before,
        0,
        "{label}: allocations detected in hot-path"
    );
}

// ── Stereo audio buffers ──

/// Pre-allocated stereo audio test infrastructure.
/// Owns both the sample buffers and the CLAP `AudioPorts` / `EventBuffer`.
pub struct StereoTestBuffers {
    pub in_l: Vec<f32>,
    pub in_r: Vec<f32>,
    pub out_l: Vec<f32>,
    pub out_r: Vec<f32>,
    pub input_ports: AudioPorts,
    pub output_ports: AudioPorts,
    pub output_events_buffer: EventBuffer,
}

impl StereoTestBuffers {
    pub fn new(n: usize, in_l_val: f32, in_r_val: f32) -> Self {
        Self {
            in_l: vec![in_l_val; n],
            in_r: vec![in_r_val; n],
            out_l: vec![0.0f32; n],
            out_r: vec![0.0f32; n],
            input_ports: AudioPorts::with_capacity(2, 1),
            output_ports: AudioPorts::with_capacity(2, 1),
            output_events_buffer: EventBuffer::new(),
        }
    }
}

// ── Mono audio buffers ──

/// Pre-allocated mono audio test infrastructure.
pub struct MonoTestBuffers {
    pub in_buf: Vec<f32>,
    pub out_buf: Vec<f32>,
    pub input_ports: AudioPorts,
    pub output_ports: AudioPorts,
    pub output_events_buffer: EventBuffer,
}

impl MonoTestBuffers {
    pub fn new(n: usize, in_val: f32) -> Self {
        Self {
            in_buf: vec![in_val; n],
            out_buf: vec![0.0f32; n],
            input_ports: AudioPorts::with_capacity(1, 1),
            output_ports: AudioPorts::with_capacity(1, 1),
            output_events_buffer: EventBuffer::new(),
        }
    }
}