using CliFx.Analyzers.ObjectModel;
using CliFx.Analyzers.Utils.Extensions;
using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using Microsoft.CodeAnalysis.Diagnostics;

namespace CliFx.Analyzers
{
    [DiagnosticAnalyzer(LanguageNames.CSharp)]
    public class OptionMustHaveNameOrShortNameAnalyzer : AnalyzerBase
    {
        public OptionMustHaveNameOrShortNameAnalyzer()
            : base(
                "Options must have either a name or short name specified",
                "This option must have either a name or short name specified.")
        {
        }

        private void Analyze(
            SyntaxNodeAnalysisContext context,
            PropertyDeclarationSyntax propertyDeclaration,
            IPropertySymbol property)
        {
            var option = CommandOptionSymbol.TryResolve(property);
            if (option is null)
                return;

            if (string.IsNullOrWhiteSpace(option.Name) && option.ShortName is null)
            {
                context.ReportDiagnostic(CreateDiagnostic(propertyDeclaration.GetLocation()));
            }
        }

        public override void Initialize(AnalysisContext context)
        {
            base.Initialize(context);
            context.HandlePropertyDeclaration(Analyze);
        }
    }
}