// 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.Collections.Generic;
using System.Collections.Immutable;
using Microsoft.CodeAnalysis.Packaging;
 
namespace Microsoft.CodeAnalysis.AddImport
{
    internal static class PackageSourceHelper
    {
        private const string NugetOrg = "nuget.org";
        public const string NugetOrgSourceName = "::nuget::";
 
        public static IEnumerable<(string sourceName, string sourceUrl)> GetPackageSources(ImmutableArray<PackageSource> packageSources)
        {
            // Package source names are user configurable, but various operations and background tasks process
            // only the nuget source, so we ignore the user defined name for nuget.org so we can identify it later.
 
            var foundNugetOrg = false;
            foreach (var packageSource in packageSources)
            {
                // If the user has multiple sources from nuget.org, we only need one of them to be special
                if (!foundNugetOrg && IsNugetOrg(packageSource.Source))
                {
                    foundNugetOrg = true;
                    yield return (NugetOrgSourceName, packageSource.Source);
                }
                else
                {
                    yield return (packageSource.Name, packageSource.Source);
                }
            }
        }
 
        private static bool IsNugetOrg(string sourceUrl)
        {
            if (!Uri.TryCreate(sourceUrl, UriKind.Absolute, out var uri))
            {
                return false;
            }
 
            // The default source url for nuget.org is "api.nuget.org" so the first case catches everything
            // but the check is a little more expansive just to avoid a maintenance burden.
            return uri.Host.EndsWith($".{NugetOrg}", StringComparison.OrdinalIgnoreCase)
                || uri.Host.Equals(NugetOrg, StringComparison.OrdinalIgnoreCase);
        }
    }
}