//! Prints where a cold layout puts every widget of many grown trees, so two
//! commits can be compared on cold layout alone. The warm/cold oracle cannot
//! see a change that moves cold layout, since both of its sides move; this
//! can, by diffing its output across the change:
//!
//!     IRIS_DUMP_SEEDS=400 IRIS_DUMP_DEPTH=5 cargo test --release \
//!       --test layout_dump -- --ignored --nocapture > /tmp/before.txt
//!
//! then the same after, and `diff` the two. A line is one widget: the seed,
//! its index in creation order, and its box in window pixels, or `-` where
//! it is not drawn.

use iris::harness::Harness;
use iris::prelude::{Axis, Bound, SizeRule};
use iris::random::{Edits, build, plan};

fn env<T: std::str::FromStr>(name: &str, fallback: T) -> T {
    std::env::var(name)
        .ok()
        .and_then(|value| value.parse().ok())
        .unwrap_or(fallback)
}

#[test]
#[ignore = "a dump to diff across commits, not a check"]
fn every_cold_layout_is_printed() {
    let seeds = env("IRIS_DUMP_SEEDS", 400_u64);
    let depth = env("IRIS_DUMP_DEPTH", 5_usize);
    let mut out = String::new();
    for seed in 1..=seeds {
        let mut harness = Harness::new((1920.0, 1200.0));
        let mut plan = plan(seed, depth, &Edits::default());
        if std::env::var_os("IRIS_DUMP_UNBOUNDED").is_some() {
            plan.walk_mut(&mut |node| {
                if let Some(rules) = &mut node.size {
                    for axis in Axis::BOTH {
                        if rules[axis].bound() != Bound::ANY {
                            rules[axis] = SizeRule::Free;
                        }
                    }
                }
            });
        }
        let (root, tree) = build(&mut harness.rsc, &plan);
        harness.state.root = Some(root);
        harness.frame();
        for (index, id) in tree.ids.iter().enumerate() {
            match harness.region(id) {
                Some(region) => out.push_str(&format!("{seed} {index} {region:?}\n")),
                None => out.push_str(&format!("{seed} {index} -\n")),
            }
        }
    }
    print!("{out}");
}