// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.DotNet.VersionTools.Dependencies;
using Microsoft.DotNet.VersionTools.Dependencies.BuildOutput;
using Microsoft.DotNet.VersionTools.Util;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
 
namespace Microsoft.DotNet.VersionTools.Automation
{
    public class DependencyUpdateResults
    {
        public IEnumerable<IDependencyInfo> UsedInfos { get; }
 
        public DependencyUpdateResults(IEnumerable<IDependencyInfo> usedInfos)
        {
            UsedInfos = usedInfos;
        }
 
        public string GetSuggestedCommitMessage()
        {
            var orderedInfos = UsedInfos.OrderBy(info => info.SimpleName).ToArray();
 
            string updatedDependencyNames = string.Join(", ", orderedInfos.Select(d => d.SimpleName));
            string updatedDependencyVersions = string.Join(", ", orderedInfos.Select(d => d.SimpleVersion));
 
            string commitMessage = $"Update {updatedDependencyNames} to {updatedDependencyVersions}";
            if (UsedInfos.Count() > 1)
            {
                commitMessage += ", respectively";
            }
            return commitMessage;
        }
 
        public bool ChangesDetected()
        {
            // Ensure changes were performed as expected.
            bool hasModifiedFiles = GitHasChanges();
            bool hasUsedBuildInfo = UsedInfos.Any();
            if (hasModifiedFiles != hasUsedBuildInfo)
            {
                throw new Exception(
                    "'git status' does not match DependencyInfo information. " +
                    $"Git has modified files: {hasModifiedFiles}. " +
                    $"DependencyInfo is updated: {hasUsedBuildInfo}.");
            }
            if (!hasModifiedFiles)
            {
                Trace.TraceInformation("Dependencies are currently up to date");
                return false;
            }
            return true;
        }
 
        private static bool GitHasChanges()
        {
            string status = GitCommand.PorcelainStatus();
            Trace.TraceInformation($"git status --porcelain results:{Environment.NewLine}{status}");
            return !string.IsNullOrWhiteSpace(status);
        }
    }
}