using System.Reflection;

static partial class Tests
{
    static async Task RunCP2ARuntimeSelectionTests()
    {
        await Run("CP2A-backend-capture-and-approved-existing-cohort", CP2ASelection);
    }

    static Task CP2ASelection()
    {
        // A wrong branch, a widened cohort, or a mutable backend would break this boundary.
        var selectionType = typeof(Tests).Assembly.GetType("game.PlayerDataStorage.PlayerKVRuntimeSelection");
        Check(selectionType != null, "formal runtime selection must exist in the real production assembly");
        var capture = selectionType.GetMethod("Capture", BindingFlags.Static | BindingFlags.NonPublic);
        Check(capture != null, "capture API");
        object Take(string backend, string api, bool agg) => capture.Invoke(null, new object[] { backend, api, agg });
        var pf = Take(null, "http://unused.invalid/", false);
        Check((bool)selectionType.GetProperty("IsKV", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(pf) == false,
            "missing backend keeps PF default without applying KV URL rules");
        var kv = Take("kv", "http://s101.local:18080/", false);
        Check((bool)selectionType.GetProperty("IsKV", BindingFlags.Instance | BindingFlags.NonPublic).GetValue(kv),
            "exact KV backend and address admitted");
        var admit = selectionType.GetMethod("TryAdmitPlayer", BindingFlags.Instance | BindingFlags.NonPublic);
        Check(admit != null, "cohort admission API");
        bool Allowed(string id, out string canonical)
        {
            var args = new object[] { id, null };
            var accepted = (bool)admit.Invoke(kv, args);
            canonical = (string)args[1];
            return accepted;
        }
        Check(Allowed("00101", out var first) && first == "101", "101 uses canonical decimal identity");
        Check(Allowed("102", out var second) && second == "102", "102 admitted");
        foreach (var id in new[] { "100", "103", "0", "-101", "+101", " 101", "", "9223372036854775808" })
            Check(!Allowed(id, out _), "unapproved or malformed account denied: " + id);
        foreach (var bad in new[] {
            new object[] { "KV", "http://s101.local:18080/", false },
            new object[] { "other", "http://s101.local:18080/", false },
            new object[] { "kv", "http://s101.local:18080", false },
            new object[] { "kv", "http://other.local:18080/", false },
            new object[] { "kv", "http://s101.local:18080/", true }
        })
        {
            try { capture.Invoke(null, bad); throw new InvalidOperationException("invalid capture accepted"); }
            catch (TargetInvocationException ex) when (ex.InnerException is ArgumentException or InvalidOperationException)
            { Check(true, "invalid capture rejected"); }
        }
        return Task.CompletedTask;
    }
}