// -----------------------------------------------------------------------------
// file="PanelStateIncrementalGenerator.Emitter"
// Project: StgSharp
// Copyright (c) Nitload.
// SPDX-License-Identifier: MIT
// -----------------------------------------------------------------------------

using Microsoft.CodeAnalysis;
using Microsoft.CodeAnalysis.Text;
using System.Linq;
using System.Text;

namespace StgSharp.UserInterface.Generator
{
    internal static class PanelStateIncrementalGeneratorEmitter
    {

        public static void Emit(
                           SourceProductionContext context,
                           PanelStateIncrementalGeneratorOutput source
        )
        {
            if (source.TypeAnalyses.IsDefaultOrEmpty) {
                return;
            }

            StringBuilder builder = new();
            _ = builder.AppendLine("// <auto-generated />");
            _ = builder.AppendLine("#nullable enable");
            _ = builder.AppendLine();
            _ = builder.AppendLine("namespace StgSharp.UserInterface.Generator");
            _ = builder.AppendLine("{");
            _ = builder.AppendLine("    internal static class PanelStateIncrementalGeneratorManifest");
            _ = builder.AppendLine("    {");
            _ = builder.AppendLine("        /*");
            _ = builder.AppendLine("        internal static string[] DiscoveredTypes { get; } = new string[]");
            _ = builder.AppendLine("        {");

            foreach (string typeName in source.TypeAnalyses
                                              .Select(static analysis => analysis.Target.TypeDisplayName)
                                              .Distinct()
                                              .OrderBy(static name => name, StringComparer.Ordinal))
            {
                _ = builder.Append("            \"");
                _ = builder.Append(typeName.Replace("\"", "\"\"", StringComparison.Ordinal));
                _ = builder.AppendLine("\",");
            }

            _ = builder.AppendLine("        };");
            _ = builder.AppendLine();
            _ = builder.AppendLine("        internal static string[] AnalysisSummary { get; } = new string[]");
            _ = builder.AppendLine("        {");

            foreach (PanelStateIncrementalGeneratorTypeAnalysis analysis in source.TypeAnalyses
                                                                                  .OrderBy(static item => item.Target.TypeDisplayName, StringComparer.Ordinal))
            {
                string summary = $"{analysis.Target.TypeDisplayName} | symbols={analysis.StateSymbols.Members.Length} | bindings={analysis.StateChangeBindings.Members.Length} | handlers={analysis.StateChangeCommandHandlers.Members.Length}";
                _ = builder.Append("            \"");
                _ = builder.Append(summary.Replace("\"", "\"\"", StringComparison.Ordinal));
                _ = builder.AppendLine("\",");
            }

            _ = builder.AppendLine("        };");
            _ = builder.AppendLine("    }");
            _ = builder.AppendLine("}");

            context.AddSource(
                "PanelStateIncrementalGeneratorManifest.g.cs",
                SourceText.From(builder.ToString(), Encoding.UTF8));
        }

    }
}