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

using System.CommandLine;
using Microsoft.Deployment.DotNet.Releases;
using Microsoft.DotNet.Cli.CommandLine;
using Microsoft.DotNet.Cli.Commands.Workload.Install;
using Microsoft.DotNet.Cli.Extensions;
using Microsoft.DotNet.Cli.Utils;
using Microsoft.DotNet.Cli.Utils.Extensions;
using Microsoft.NET.Sdk.WorkloadManifestReader;

namespace Microsoft.DotNet.Cli.Commands.Workload.Config;

internal sealed class WorkloadConfigCommand : WorkloadCommandBase<WorkloadConfigCommandDefinition>
{
    private readonly bool _hasUpdateMode;
    private readonly string? _updateMode;
    private readonly IWorkloadResolverFactory _workloadResolverFactory;

    private readonly string _dotnetPath;
    private readonly ReleaseVersion _sdkVersion;
    private readonly SdkFeatureBand _sdkFeatureBand;

    private readonly IInstaller _workloadInstaller;

    public WorkloadConfigCommand(
        ParseResult parseResult,
        IReporter? reporter = null,
        IWorkloadResolverFactory? workloadResolverFactory = null
    ) : base(parseResult, reporter)
    {
        _hasUpdateMode = parseResult.HasOption(Definition.UpdateMode);
        _updateMode = parseResult.GetValue(Definition.UpdateMode);

        _workloadResolverFactory = workloadResolverFactory ?? new WorkloadResolverFactory();

        var creationResult = _workloadResolverFactory.Create();

        _dotnetPath = creationResult.DotnetPath;
        _sdkVersion = creationResult.SdkVersion;

        _sdkFeatureBand = new SdkFeatureBand(_sdkVersion);
        _workloadInstaller = WorkloadInstallerFactory.GetWorkloadInstaller(Reporter, _sdkFeatureBand, creationResult.WorkloadResolver, Verbosity, creationResult.UserProfileDir, VerifySignatures, PackageDownloader, creationResult.DotnetPath);
    }

    public override int Execute()
    {
        //  When we support multiple configuration values, it would be nice if we could process and display them in the order they are passed.
        //  It seems that the parser doesn't give us a good way to do that, however
        if (_hasUpdateMode)
        {
            string? globalJsonPath = SdkDirectoryWorkloadManifestProvider.GetGlobalJsonPath(Environment.CurrentDirectory);
            var globalJsonVersion = SdkDirectoryWorkloadManifestProvider.GlobalJsonReader.GetWorkloadVersionFromGlobalJson(globalJsonPath, out bool? shouldUseWorkloadSets);
            shouldUseWorkloadSets ??= string.IsNullOrWhiteSpace(globalJsonVersion) ? null : true;
            if (WorkloadConfigCommandDefinition.UpdateMode_WorkloadSet.Equals(_updateMode, StringComparison.InvariantCultureIgnoreCase))
            {
                if (shouldUseWorkloadSets == false)
                {
                    Reporter.WriteLine(string.Format(CliCommandStrings.UpdateModeDoesNotMatchGlobalJson, WorkloadConfigCommandDefinition.UpdateMode_WorkloadSet, globalJsonPath, WorkloadConfigCommandDefinition.UpdateMode_Manifests).Yellow());
                }
                else
                {
                    _workloadInstaller.UpdateInstallMode(_sdkFeatureBand, true);
                }
            }
            else if (WorkloadConfigCommandDefinition.UpdateMode_Manifests.Equals(_updateMode, StringComparison.InvariantCultureIgnoreCase))
            {
                if (shouldUseWorkloadSets == true)
                {
                    Reporter.WriteLine(string.Format(CliCommandStrings.UpdateModeDoesNotMatchGlobalJson, WorkloadConfigCommandDefinition.UpdateMode_Manifests, globalJsonPath, WorkloadConfigCommandDefinition.UpdateMode_WorkloadSet).Yellow());
                }
                else
                {
                    _workloadInstaller.UpdateInstallMode(_sdkFeatureBand, false);
                }
            }
            else if (string.IsNullOrEmpty(_updateMode))
            {
                if (shouldUseWorkloadSets ?? WorkloadManifestUpdater.ShouldUseWorkloadSetMode(_sdkFeatureBand, _dotnetPath))
                {
                    Reporter.WriteLine(WorkloadConfigCommandDefinition.UpdateMode_WorkloadSet);
                }
                else
                {
                    Reporter.WriteLine(WorkloadConfigCommandDefinition.UpdateMode_Manifests);
                }
            }
            else
            {
                //  This should not be hit, as parser sets the accepted values and should error before getting here if the value is not valid
                throw new InvalidOperationException($"Invalid update mode: {_updateMode}");
            }
        }
        else
        {
            _parseResult.ShowHelp();
        }

        return 0;
    }
}