//! Checks `kv_sync::replay` against the shared decision table (kestrove-spec/vectors/item_replay.json).

use kv_sync::replay::{check_successor, next_version, Base};
use serde_json::Value;

fn vectors() -> Value {
    serde_json::from_str(include_str!("vectors/item_replay.json")).unwrap()
}

fn base(v: &Value) -> Base<'_> {
    if v.is_null() {
        return Base::None;
    }
    let revision = v["revision"].as_u64().unwrap();
    if v["tombstone"] == Value::Bool(true) {
        Base::Tombstone { revision }
    } else {
        Base::Live { revision, item: &v["item"] }
    }
}

#[test]
fn check_table() {
    for case in vectors()["check"].as_array().unwrap() {
        let got = check_successor(base(&case["base"]), case["revision"].as_u64().unwrap(), &case["incoming"]);
        let want = case["result"].as_str().unwrap();
        assert_eq!(if got.is_ok() { "accept" } else { "alarm" }, want, "{}", case["name"]);
    }
}

#[test]
fn next_version_table() {
    for case in vectors()["next_version"].as_array().unwrap() {
        let local = Some(&case["local"]).filter(|v| !v.is_null());
        let (seq, restores) = next_version(local, base(&case["base"]));
        assert_eq!(Some(seq), case["seq"].as_u64(), "{}", case["name"]);
        assert_eq!(restores, case["restores"].as_u64(), "{}", case["name"]);
    }
}

#[test]
fn spec_copy_is_identical() {
    let spec = concat!(env!("CARGO_MANIFEST_DIR"), "/../../../kestrove-spec/vectors/item_replay.json");
    if let Ok(s) = std::fs::read_to_string(spec) {
        assert_eq!(s, include_str!("vectors/item_replay.json"), "kestrove-spec copy differs");
    }
}