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

using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using Microsoft.Build.Framework;
using Microsoft.Build.Utilities;

namespace Microsoft.DotNet.Build.Tasks.Installers;

[MSBuildMultiThreadableTask]
public sealed class CreateControlFile : Task, IMultiThreadableTask
{
    /// <summary>Injected by MSBuild so paths resolve against the project directory in multithreaded builds.</summary>
    public TaskEnvironment TaskEnvironment { get; set; } = TaskEnvironment.Fallback;

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

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

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

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

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

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

    [Required]
    public ITaskItem[] Depends { get; set; }

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

    public ITaskItem[] AdditionalProperties { get; set; }

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

    public override bool Execute()
    {
        using Stream stream = File.Create(TaskEnvironment.GetAbsolutePath(ControlFileOutputPath));
        using StreamWriter writer = new(stream, Encoding.ASCII);
        writer.WriteLine($"Package: {PackageName}");
        writer.WriteLine($"Version: {PackageVersion}");
        writer.WriteLine($"Architecture: {PackageArchitecture}");
        writer.WriteLine($"Maintainer: {Maintainer}");
        writer.WriteLine($"Installed-Size: {InstalledSize}");
        List<string> dependencyItems = [];
        foreach (ITaskItem depend in Depends ?? [])
        {
            string dependencyItem = depend.ItemSpec;

            string version = depend.GetMetadata("Version");
            if (!string.IsNullOrEmpty(version))
            {
                dependencyItem += $" (>= {version})";
            }

            dependencyItems.Add(dependencyItem);
        }
        if (Depends.Length > 0)
        {
            writer.WriteLine("Depends: " + string.Join(", ", dependencyItems));
        }
        writer.WriteLine($"Section: {Section}");
        writer.WriteLine("Priority: standard");
        writer.WriteLine("Homepage: https://github.com/dotnet/core");
        foreach (ITaskItem property in AdditionalProperties ?? [])
        {
            writer.WriteLine($"{property.ItemSpec}: {property.GetMetadata("Value")}");
        }

        // As per the control spec, multiline descriptions must have leading spaces
        // for each line after the first.
        // Two spaces represents a verbatim line break (as compared to one for package authoring that will not be preserved).
        writer.WriteLine($"Description: {Description.Replace("\n", "\n  ")}");
        return true;
    }
}