use patina_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_automation_and_analysis_do_not_allocate_or_free() {
    let mut engine = Engine::new(48000., 2).unwrap();
    let mut settings = Settings::preset(1);
    settings.tone_guard = 80.;
    engine.set_settings(settings).unwrap();
    CHECK.with(|v| v.set(true));
    for i in 0..48000 {
        if i % 512 == 0 {
            settings.focus[0].enabled = true;
            settings.focus[0].frequency = 1000. + (i % 10000) as f32;
            settings.focus[0].sensitivity = 6.;
            settings.low = 120. + (i % 100) as f32;
            engine.set_settings(settings).unwrap();
        }
        // A pitched input, so Tone guard estimates the pitch and updates its maps.
        let x = 0.3
            * (i as f32 * std::f32::consts::TAU * 55. / 48000.)
                .sin()
                .signum();
        std::hint::black_box(engine.process_sample([x, -x], Monitor { delta: i > 24000 }));
        std::hint::black_box(engine.take_analyzer());
    }
    engine.reset();
    CHECK.with(|v| v.set(false));
    assert_eq!(OPERATIONS.with(Cell::get), 0);
}