using ZB.MOM.WW.ScadaBridge.ScriptAnalysis;

namespace ZB.MOM.WW.ScadaBridge.ScriptAnalysis.Tests;

/// <summary>
/// M3.1: parse + compile gate tests. The "representative real script" corpus is
/// the PRIMARY guard that <see cref="ScriptCompileSurface"/> faithfully mirrors
/// the runtime <c>ScriptGlobals</c> surface — if a member or signature drifts,
/// the corpus stops binding and this test fails.
/// </summary>
public class RoslynScriptCompilerTests
{
    [Fact]
    public void ParseDiagnostics_NonEmpty_ForSyntaxError()
    {
        Assert.NotEmpty(RoslynScriptCompiler.ParseDiagnostics("var x = ;"));
    }

    [Fact]
    public void ParseDiagnostics_Empty_ForValidSyntax()
    {
        Assert.Empty(RoslynScriptCompiler.ParseDiagnostics("var x = 1;"));
    }

    [Fact]
    public void Compile_NonEmpty_ForUndefinedSymbol()
    {
        var code = "var x = NoSuchThing.Foo();";
        Assert.NotEmpty(RoslynScriptCompiler.Compile(code, typeof(ScriptCompileSurface)));
    }

    [Fact]
    public void Compile_Empty_ForRepresentativeRealScript()
    {
        const string code = """
            var temp = Attributes["Temperature"];
            Attributes["Setpoint"] = 42;
            var r = await ExternalSystem.Call("erp", "sync");
            var op = await Database.CachedWrite("hist", "INSERT ...");
            await Notify.To("ops").Send("subj", "msg");
            var shared = await Scripts.CallShared("Helper");
            var child = Children["Pump"].Attributes["Speed"];

            // Widen coverage across the rest of the surface.
            var attr = await Instance.GetAttribute("Temperature");
            await Instance.SetAttribute("Setpoint", "43");
            var track = await Instance.Tracking.Status(op);
            var parentSpeed = Parent?.Attributes["Speed"];
            var alarmName = Alarm?.Name;
            var p = Parameters;
            var ct = CancellationToken;
            var status = await Notify.Status("notif-id");
            var cachedCall = await ExternalSystem.CachedCall("erp", "ping");
            var resolved = Attributes.Resolve("Temperature");
            var conn = await Database.Connection("hist");
            var scope = Scope;
            """;

        var diagnostics = RoslynScriptCompiler.Compile(code, typeof(ScriptCompileSurface));
        Assert.Empty(diagnostics);
    }

    [Fact]
    public void Compile_Empty_ForTriggerExpression()
    {
        const string expr =
            "Attributes[\"Temp\"] != null && (int)(Children[\"P\"].Attributes[\"S\"] ?? 0) > 5";

        var diagnostics = RoslynScriptCompiler.Compile(expr, typeof(TriggerCompileSurface));
        Assert.Empty(diagnostics);
    }
}