use quench_core::{Engine, Monitor, Settings};
use std::{
    alloc::{GlobalAlloc, Layout, System},
    cell::Cell,
};

struct CheckedAllocator;
thread_local! {
    static CHECK:Cell<bool>=const {Cell::new(false)};
    static OPERATIONS:Cell<usize>=const {Cell::new(0)};
}
fn record() {
    if CHECK.try_with(Cell::get).unwrap_or(false) {
        let _ = OPERATIONS.try_with(|n| n.set(n.get() + 1));
    }
}
unsafe impl GlobalAlloc for CheckedAllocator {
    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
        record();
        unsafe { System.alloc(layout) }
    }
    unsafe fn dealloc(&self, pointer: *mut u8, layout: Layout) {
        record();
        unsafe { System.dealloc(pointer, layout) }
    }
    unsafe fn realloc(&self, pointer: *mut u8, layout: Layout, size: usize) -> *mut u8 {
        record();
        unsafe { System.realloc(pointer, layout, size) }
    }
}
#[global_allocator]
static ALLOCATOR: CheckedAllocator = CheckedAllocator;

#[test]
fn processing_settings_monitors_and_analysis_do_not_allocate_or_free() {
    let mut engine = Engine::new(48000., 2).unwrap();
    let mut settings = Settings {
        drive: 12.,
        ..Settings::default()
    };
    engine.set_settings(settings).unwrap();
    let monitors = [Monitor::Quench, Monitor::Plain, Monitor::Delta];
    CHECK.with(|v| v.set(true));
    for i in 0..96000 {
        if i % 4800 == 0 {
            let step = i / 4800;
            settings.split = 60. + 20. * (step % 6) as f32;
            settings.hold = 20. + 40. * (step % 3) as f32;
            settings.soft = 25. * (step % 5) as f32;
            settings.ceiling = -3. * (step % 3) as f32;
            settings.bypass = step % 7 == 6;
            engine.set_settings(settings).unwrap();
        }
        let t = i as f32 / 48000.;
        let x = (std::f32::consts::TAU * 45. * t).sin() * 0.5
            + (std::f32::consts::TAU * 733. * t).sin() * 0.5;
        std::hint::black_box(engine.process_sample([x, -x], monitors[(i / 9600) % 3]));
        if i % 1600 == 0 {
            std::hint::black_box(engine.take_analyzer());
        }
    }
    engine.reset();
    CHECK.with(|v| v.set(false));
    assert_eq!(OPERATIONS.with(Cell::get), 0);
}