//! Helpers shared across the integration suites.
//!
//! Each integration file is its own binary, so `mod common;` compiles a copy
//! per suite. Anything unused in a given suite would warn, hence the
//! `#![allow(dead_code)]`.

#![allow(dead_code)]

use trueskill_tt::Gaussian;

/// A posterior must be finite with a strictly positive sigma.
///
/// A non-finite posterior is the failure mode this crate is most prone to —
/// EP breaking down produces NaN rather than an error — and a zero or negative
/// sigma means the precision went non-positive, which `Gaussian::sigma` reports
/// as improper rather than trapping.
pub fn assert_finite(g: Gaussian, what: &str) {
    assert!(
        g.mu().is_finite(),
        "{what}: mu is not finite (mu={}, sigma={})",
        g.mu(),
        g.sigma()
    );

    assert!(
        g.sigma().is_finite() && g.sigma() > 0.0,
        "{what}: sigma must be finite and positive (mu={}, sigma={})",
        g.mu(),
        g.sigma()
    );
}

/// Every point on every learning curve must be finite.
pub fn assert_curve_finite(curve: &[(i64, Gaussian)], who: &str) {
    for (time, g) in curve {
        assert_finite(*g, &format!("{who} at t={time}"));
    }
}