// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
using System;
using System.Collections.Generic;
using System.Collections.Immutable;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CodeAnalysis.SolutionCrawler;
using Microsoft.CodeAnalysis.Workspaces.Diagnostics;
using Roslyn.Utilities;
 
namespace Microsoft.CodeAnalysis.Diagnostics.EngineV2;
 
/// <summary>
/// Diagnostic Analyzer Engine V2
/// 
/// This one follows pattern compiler has set for diagnostic analyzer.
/// </summary>
internal partial class DiagnosticIncrementalAnalyzer
{
    private readonly DiagnosticAnalyzerTelemetry _telemetry = new();
    private readonly StateManager _stateManager;
    private readonly InProcOrRemoteHostAnalyzerRunner _diagnosticAnalyzerRunner;
    private readonly IncrementalMemberEditAnalyzer _incrementalMemberEditAnalyzer = new();
 
    internal DiagnosticAnalyzerService AnalyzerService { get; }
 
    [Obsolete(MefConstruction.FactoryMethodMessage, error: true)]
    public DiagnosticIncrementalAnalyzer(
        DiagnosticAnalyzerService analyzerService,
        Workspace workspace,
        DiagnosticAnalyzerInfoCache analyzerInfoCache,
        IGlobalOptionService globalOptionService)
    {
        Contract.ThrowIfNull(analyzerService);
 
        AnalyzerService = analyzerService;
        GlobalOptions = globalOptionService;
 
        _stateManager = new StateManager(workspace, analyzerInfoCache);
        _stateManager.ProjectAnalyzerReferenceChanged += OnProjectAnalyzerReferenceChanged;
 
        var enabled = globalOptionService.GetOption(SolutionCrawlerRegistrationService.EnableSolutionCrawler);
        _diagnosticAnalyzerRunner = new InProcOrRemoteHostAnalyzerRunner(
            enabled, analyzerInfoCache, analyzerService.Listener);
    }
 
    internal IGlobalOptionService GlobalOptions { get; }
    internal DiagnosticAnalyzerInfoCache DiagnosticAnalyzerInfoCache => _diagnosticAnalyzerRunner.AnalyzerInfoCache;
 
    private void OnProjectAnalyzerReferenceChanged(object? sender, ProjectAnalyzerReferenceChangedEventArgs e)
    {
        if (e.Removed.Length == 0)
        {
            // nothing to refresh
            return;
        }
 
        // make sure we drop cache related to the analyzers
        foreach (var stateSet in e.Removed)
            stateSet.OnRemoved();
    }
 
    public static Task<VersionStamp> GetDiagnosticVersionAsync(Project project, CancellationToken cancellationToken)
        => project.GetDependentVersionAsync(cancellationToken);
 
    private static DiagnosticAnalysisResult GetResultOrEmpty(ImmutableDictionary<DiagnosticAnalyzer, DiagnosticAnalysisResult> map, DiagnosticAnalyzer analyzer, ProjectId projectId, VersionStamp version)
    {
        if (map.TryGetValue(analyzer, out var result))
        {
            return result;
        }
 
        return DiagnosticAnalysisResult.CreateEmpty(projectId, version);
    }
 
    internal async Task<IEnumerable<DiagnosticAnalyzer>> GetAnalyzersTestOnlyAsync(Project project, CancellationToken cancellationToken)
    {
        var analyzers = await _stateManager.GetOrCreateStateSetsAsync(project, cancellationToken).ConfigureAwait(false);
 
        return analyzers.Select(s => s.Analyzer);
    }
 
    private static string GetProjectLogMessage(Project project, ImmutableArray<StateSet> stateSets)
        => $"project: ({project.Id}), ({string.Join(Environment.NewLine, stateSets.Select(s => s.Analyzer.ToString()))})";
}