using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Syntax;

namespace Godot.SourceGenerators
{
    public static class Common
    {
        public static void ReportNonPartialGodotScriptClass(
            GeneratorExecutionContext context,
            ClassDeclarationSyntax cds, INamedTypeSymbol symbol
        )
        {
            string message =
                "Missing partial modifier on declaration of type '" +
                $"{symbol.FullQualifiedName()}' which is a subclass of '{GodotClasses.Object}'";

            string description = $"{message}. Subclasses of '{GodotClasses.Object}' " +
                                 "must be declared with the partial modifier.";

            context.ReportDiagnostic(Diagnostic.Create(
                new DiagnosticDescriptor(id: "GODOT-G0001",
                    title: message,
                    messageFormat: message,
                    category: "Usage",
                    DiagnosticSeverity.Error,
                    isEnabledByDefault: true,
                    description),
                cds.GetLocation(),
                cds.SyntaxTree.FilePath));
        }

        public static void ReportNonPartialGodotScriptOuterClass(
            GeneratorExecutionContext context,
            TypeDeclarationSyntax outerTypeDeclSyntax
        )
        {
            var outerSymbol = context.Compilation
                .GetSemanticModel(outerTypeDeclSyntax.SyntaxTree)
                .GetDeclaredSymbol(outerTypeDeclSyntax);

            string fullQualifiedName = outerSymbol is INamedTypeSymbol namedTypeSymbol ?
                namedTypeSymbol.FullQualifiedName() :
                "type not found";

            string message =
                $"Missing partial modifier on declaration of type '{fullQualifiedName}', " +
                $"which contains one or more subclasses of '{GodotClasses.Object}'";

            string description = $"{message}. Subclasses of '{GodotClasses.Object}' and their " +
                                 "containing types must be declared with the partial modifier.";

            context.ReportDiagnostic(Diagnostic.Create(
                new DiagnosticDescriptor(id: "GODOT-G0002",
                    title: message,
                    messageFormat: message,
                    category: "Usage",
                    DiagnosticSeverity.Error,
                    isEnabledByDefault: true,
                    description),
                outerTypeDeclSyntax.GetLocation(),
                outerTypeDeclSyntax.SyntaxTree.FilePath));
        }
    }
}