// 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.Text;
using Microsoft.Build.Framework;

namespace Microsoft.DotNet.ArcadeLogging;

/// <summary>
/// Logger that translates MSBuild errors and warnings into the Azure Pipelines task
/// logging format so that they surface as issues on the build timeline.
///
/// https://github.com/Microsoft/azure-pipelines-tasks/blob/601dd2f0a3e671b19b55bcf139f554a09f3414da/docs/authoring/commands.md
/// </summary>
public sealed class PipelinesLogger : ILogger
{
    public LoggerVerbosity Verbosity { get; set; }
    public string Parameters { get; set; }

    public void Initialize(IEventSource eventSource)
    {
        eventSource.ErrorRaised += OnErrorRaised;
        eventSource.WarningRaised += OnWarningRaised;
    }

    public void Shutdown()
    {
    }

    private static void LogIssue(
        bool isError,
        string sourceFilePath,
        int line,
        int column,
        string code,
        string message)
    {
        var builder = new StringBuilder();
        builder.Append("##vso[task.logissue ");
        builder.Append($"type={(isError ? "error" : "warning")};");
        builder.Append($"sourcepath={Escape(sourceFilePath)};");
        builder.Append($"linenumber={line};");
        builder.Append($"columnnumber={column};");
        builder.Append($"code={Escape(code)};");
        builder.Append("]");
        builder.Append(Escape(message));
        Console.WriteLine(builder.ToString());
    }

    private void OnErrorRaised(object sender, BuildErrorEventArgs e) =>
        LogIssue(isError: true, e.File, e.LineNumber, e.ColumnNumber, e.Code, e.Message);

    private void OnWarningRaised(object sender, BuildWarningEventArgs e) =>
        LogIssue(isError: false, e.File, e.LineNumber, e.ColumnNumber, e.Code, e.Message);

    private static string Escape(string value)
    {
        if (string.IsNullOrEmpty(value))
        {
            return string.Empty;
        }

        var result = new StringBuilder(value.Length);
        foreach (char c in value)
        {
            switch (c)
            {
                case '%':
                    result.Append("%25");
                    break;
                case ';':
                    result.Append("%3B");
                    break;
                case '\r':
                    result.Append("%0D");
                    break;
                case '\n':
                    result.Append("%0A");
                    break;
                case ']':
                    result.Append("%5D");
                    break;
                default:
                    result.Append(c);
                    break;
            }
        }

        return result.ToString();
    }
}