// 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.IO;
using System.Linq;
using System.Collections;
using System.Collections.Generic;
using System.Text.RegularExpressions;
using System.Formats.Tar;
using System.Threading.Tasks;
using Xunit;
using Xunit.Abstractions;

namespace Microsoft.DotNet.SourceBuild.SmokeTests;

[Trait("Category", "SdkContent")]
public class ArtifactsSizeTest : SmokeTests
{
    private static readonly string BaselineFilePath = BaselineHelper.GetBaselineFilePath($"ArtifactsSizes/{Config.TargetRid}.txt");
    private static readonly Dictionary<string, long> BaselineFileContent = new Dictionary<string, long>();
    private static readonly Regex BuildVersionPattern = new(@"\b\d+\.\d+\.\d+[-@](alpha|preview|rc|rtm)\.\d(\.\d+\.\d+)?\b");
    private const int SizeThreshold = 25;


    public ArtifactsSizeTest(ITestOutputHelper outputHelper) : base(outputHelper)
    {
        if(File.Exists(BaselineFilePath))
        {
            string[] baselineFileContent = File.ReadAllLines(BaselineFilePath);
            foreach(string entry in baselineFileContent)
            {
                string[] splitEntry = entry.Split(':');
                BaselineFileContent[splitEntry[0].Trim()] = long.Parse(splitEntry[1].Trim());
            }
        }
        else
        {
            Assert.True(Directory.Exists(BaselineHelper.GetBaselineFilePath("ArtifactsSizes/")));
            Assert.False(true, $"Baseline file `{BaselineFilePath}' does not exist. Please create the baseline file then rerun the test.");
        }
    }

    [SkippableFact(new[] { Config.SourceBuiltArtifactsPathEnv, Config.SdkTarballPathEnv, Config.TargetRidEnv }, skipOnNullOrWhiteSpace: true)]
    public void CompareArtifactsToBaseline()
    {
        Assert.NotNull(Config.SourceBuiltArtifactsPath);
        Assert.NotNull(Config.SdkTarballPath);
        Assert.NotNull(Config.TargetRid);

        IEnumerable<TarEntry> artifactsTarEntries = Utilities.GetTarballContent(Config.SourceBuiltArtifactsPath).Where(entry => entry.EntryType == TarEntryType.RegularFile);
        IEnumerable<TarEntry> sdkTarEntries = Utilities.GetTarballContent(Config.SdkTarballPath).Where(entry => entry.EntryType == TarEntryType.RegularFile);

        (string FilePath, long Bytes)[] tarEntries = sdkTarEntries.Concat(artifactsTarEntries)
            .Select(entry =>
            {
                string result = BaselineHelper.RemoveVersions(entry.Name);
                result = BaselineHelper.RemoveRids(result);
                result = BaselineHelper.RemoveNetTfmPaths(result);

                return (FilePath: result, Bytes: entry.Length);

            })
            .OrderBy(entry => entry.FilePath)
            .ToArray();

        foreach (var entry in tarEntries)
        {
            if (!BaselineFileContent.ContainsKey(entry.FilePath))
            {
                OutputHelper.LogWarningMessage($"{entry.FilePath} does not exist in baseline. Adding it to the baseline file");
            }
            else
            {
                CompareFileSizes(entry.FilePath, entry.Bytes, BaselineFileContent[entry.FilePath]);
            }
        }

        try
        {
            string actualFilePath = Path.Combine(DotNetHelper.LogsDirectory, $"Updated_ArtifactsSizes_{Config.TargetRid}.txt");
            File.WriteAllLines(actualFilePath, tarEntries.Select(entry => $"{entry.FilePath}: {entry.Bytes}"));
        }
        catch (IOException ex)
        {
            throw new InvalidOperationException($"An error occurred while copying the baselines file: {BaselineFilePath}", ex);
        }
    }

    private void CompareFileSizes(string filePath, long fileSize, long baselineSize)
    {
        if (fileSize == 0 && baselineSize != 0)
            OutputHelper.LogWarningMessage($"'{filePath}' is now 0 bytes. It was {baselineSize} bytes");
        else if (fileSize != 0 && baselineSize == 0)
            OutputHelper.LogWarningMessage($"'{filePath}' is no longer 0 bytes. It is now {fileSize} bytes");
        else if (baselineSize != 0 && Math.Abs(((fileSize - baselineSize) / (double)baselineSize) * 100) >= SizeThreshold)
            OutputHelper.LogWarningMessage($"'{filePath}' increased in size by more than {SizeThreshold}%. It was originally {baselineSize} bytes and is now {fileSize} bytes");
    }
}