using System;
using System.Collections.Generic;
using GammaJul.ForTea.Core.Parsing;
using GammaJul.ForTea.Core.TemplateProcessing.CodeCollecting.Interrupt;
using GammaJul.ForTea.Core.Tree;
using JetBrains.Annotations;
using JetBrains.Application.Parts;
using JetBrains.Application.Threading;
using JetBrains.Diagnostics;
using JetBrains.ForTea.RiderPlugin.Model;
using JetBrains.ForTea.RiderPlugin.TemplateProcessing.CodeGeneration;
using JetBrains.ForTea.RiderPlugin.TemplateProcessing.Managing;
using JetBrains.ProjectModel;
using JetBrains.RdBackend.Common.Features.ProjectModel.View;
using JetBrains.ReSharper.Psi;
using JetBrains.ReSharper.Psi.Tree;
using JetBrains.ReSharper.Resources.Shell;
using JetBrains.Util;
using JetBrains.Util.dataStructures;

namespace JetBrains.ForTea.RiderPlugin.ProtocolAware.Services.Impl
{
  [SolutionComponent(Instantiation.DemandAnyThreadUnsafe)]
  public sealed class T4TemplatePreprocessingManager : IT4TemplatePreprocessingManager
  {
    private DateTime PreviousExecutedFileWriteTime { get; set; }

    [NotNull] private IT4TargetFileManager TargetFileManager { get; }

    [NotNull] private IT4BuildMessageConverter BuildMessageConverter { get; }

    [NotNull] private ILogger Logger { get; }

    public T4TemplatePreprocessingManager(
      [NotNull] IT4TargetFileManager targetFileManager,
      [NotNull] ILogger logger,
      [NotNull] IT4BuildMessageConverter buildMessageConverter
    )
    {
      TargetFileManager = targetFileManager;
      Logger = logger;
      BuildMessageConverter = buildMessageConverter;
    }

    public void TryPreprocess(IT4File file)
    {
      Logger.Verbose("Trying to preprocess a file");
      var psiSourceFile = file.PhysicalPsiSourceFile.NotNull();
      var lastWriteTimeUtc = psiSourceFile.LastWriteTimeUtc;
      if (lastWriteTimeUtc == PreviousExecutedFileWriteTime) return;
      PreviousExecutedFileWriteTime = lastWriteTimeUtc;
      Preprocess(file);
    }

    public T4PreprocessingResult Preprocess(IT4File file)
    {
      Logger.Verbose("Preprocessing a file");
      var psiSourceFile = file.PhysicalPsiSourceFile.NotNull();
      var projectFile = psiSourceFile.ToProjectFile().NotNull();
      var solution = file.GetSolution();
      var contextFreeTree = psiSourceFile.BuildT4Tree();
      var location = new T4FileLocation(solution.GetComponent<ProjectModelViewHost>().GetIdByItem(projectFile));
      try
      {
        string message = T4RiderCodeGeneration.GeneratePreprocessedCode(contextFreeTree).RawText;
        solution.Locks.ExecuteOrQueueEx(solution.GetSolutionLifetimes().UntilSolutionCloseLifetime,
          "T4 template preprocessing", () =>
          {
            using (WriteLockCookie.Create())
            {
              TargetFileManager.SavePreprocessResults(file, message);
            }
          });
        return new T4PreprocessingResult(location, true, new List<T4BuildMessage>());
      }
      catch (T4OutputGenerationException e)
      {
        var message = BuildMessageConverter.ToT4BuildMessages(e.FailureDatum.AsEnumerable());
        return new T4PreprocessingResult(location, false, message);
      }
    }
  }
}