use domain::{KeyMapping, Value};
use std::collections::BTreeMap;

#[test]
fn extracts_value_at_path_and_renames_key() {
    let mapping = KeyMapping {
        source_path: "$.main.temp".into(),
        target_key: "temperature".into(),
    };

    let raw = Value::Object(BTreeMap::from([(
        "main".into(),
        Value::Object(BTreeMap::from([("temp".into(), Value::Number(5.4))])),
    )]));

    let result = mapping.extract(&raw);
    assert_eq!(result, Some(("temperature".into(), Value::Number(5.4))));
}

#[test]
fn returns_none_when_path_does_not_match() {
    let mapping = KeyMapping {
        source_path: "$.missing.path".into(),
        target_key: "value".into(),
    };

    let raw = Value::Object(BTreeMap::from([("other".into(), Value::Number(1.0))]));

    assert_eq!(mapping.extract(&raw), None);
}