use crate::Configuration;
use std::collections::HashSet;

fn check_configs_equal(
	cfg1: &Configuration,
	cfg2: &Configuration,
) -> Result<(), Box<dyn std::error::Error>> {
	let keys1: HashSet<&str> = cfg1.iter().map(|(k, _)| k).collect();
	let keys2: HashSet<&str> = cfg2.iter().map(|(k, _)| k).collect();
	for key in keys1.difference(&keys2) {
		return Err(format!(
			"Key {key} appears at {}, but not in other configuration",
			cfg1.location(&key).unwrap()
		)
		.into());
	}
	for key in keys2.difference(&keys1) {
		return Err(format!(
			"Key {key} appears at {}, but not in other configuration",
			cfg2.location(&key).unwrap()
		)
		.into());
	}
	for (key, val1) in cfg1.iter() {
		let val2 = cfg2.get(&key).unwrap();
		if val1 != val2 {
			return Err(format!(
				"Mismatch between values for key {key}
defined as {val1:?} at {},
but defined as {val2:?} at {}",
				cfg1.location(&key)
					.map_or("<nowhere>".into(), |x| format!("{x}")),
				cfg2.location(&key)
					.map_or("<nowhere>".into(), |x| format!("{x}")),
			)
			.into());
		}
	}
	Ok(())
}

#[test]
fn parsing() {
	super::do_tests_in_dir("parsing", ".flat.pom", |filename| {
		let config1 = Configuration::load_path(filename)?;
		let config2 = Configuration::load_path(&filename.replace(".flat.pom", ".pom"))?;
		check_configs_equal(&config1, &config2)
	})
}