// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Collections.Generic;
using System.IO;
using Microsoft.Build.Framework;
using XliffTasks.Model;

namespace XliffTasks.Tasks;

[MSBuildMultiThreadableTask]
public sealed class EnsureAllResourcesTranslated : XlfTask
{
    [Required]
    public ITaskItem[] Sources { get; set; }

    [Required]
    public string[] Languages { get; set; }

    protected override void ExecuteCore()
    {
        foreach (ITaskItem item in Sources)
        {
            string sourceDocumentPath = item.GetMetadataOrDefault(MetadataKey.SourceDocumentPath, item.ItemSpec);

            SortedSet<string> untranslatedResourceSet = new(StringComparer.Ordinal);

            foreach (string language in Languages)
            {
                // The neutral .xlf file is an input to the localization system, not a
                // translation, so its untranslated resources are expected.
                if (XlfTask.IsNeutralLanguage(language))
                {
                    continue;
                }

                string xlfPath = XlfTask.GetXlfPath(sourceDocumentPath, language);
                XlfDocument xlfDocument;

                try
                {
                    xlfDocument = XlfTask.LoadXlfDocument(TaskEnvironment.GetAbsolutePath(xlfPath));
                }
                catch (FileNotFoundException)
                {
                    // If the file doesn't exist, we don't need to worry about it having
                    // untranslated resources.
                    continue;
                }

                untranslatedResourceSet.UnionWith(xlfDocument.GetUntranslatedResourceIDs());
            }

            if (untranslatedResourceSet.Count > 0)
            {
                string untranslatedResourceNames = string.Join(", ", untranslatedResourceSet);
                Log.LogErrorInFile(sourceDocumentPath, $"Found {untranslatedResourceSet.Count} untranslated resource(s): {untranslatedResourceNames}");
            }
        }
    }
}