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

using System.Text.Json;
using System.Text.Json.Serialization;

namespace Microsoft.NET.Sdk.WorkloadManifestReader
{
    /// <summary>
    /// Workload pack ids are NuGet ids: comparisons are case insensitive, and nupkg files are expected to be stored with "canonical" lowercased names.
    /// However, display strings and paths in the sdk/packs/* folder use original casing.
    /// This internal struct helps preserve/annotate these semantics.
    /// </summary>
    /// <remarks>This is distinct from <see cref="WorkloadId"/> to prevent accidental confusion, but the behavior is identical</remarks>
    [JsonConverter(typeof(PackIdJsonConverter))]
    public struct WorkloadPackId : IComparable<WorkloadPackId>, IEquatable<WorkloadPackId>
    {
        string _id;

        public WorkloadPackId(string id)
        {
            if (string.IsNullOrWhiteSpace(id))
            {
                throw new ArgumentException($"'{nameof(id)}' cannot be null or whitespace", nameof(id));
            }

            _id = id;
        }

        public int CompareTo(WorkloadPackId other) => string.Compare(_id, other._id, StringComparison.OrdinalIgnoreCase);

        public bool Equals(WorkloadPackId other) => string.Equals(_id, other._id, StringComparison.OrdinalIgnoreCase);

        public override int GetHashCode() => StringComparer.OrdinalIgnoreCase.GetHashCode(_id);

        public override bool Equals(object? obj) => obj is WorkloadPackId id && Equals(id);

        public override string ToString() => _id;

        public string GetNuGetCanonicalId() => _id.ToLowerInvariant();

        public static implicit operator string(WorkloadPackId id) => id._id;

        public static bool operator ==(WorkloadPackId a, WorkloadPackId b) => a.Equals(b);

        public static bool operator !=(WorkloadPackId a, WorkloadPackId b) => !a.Equals(b);
    }

    public class PackIdJsonConverter : JsonConverter<WorkloadPackId>
    {
        public override WorkloadPackId Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options) =>
            new(reader.GetString() ?? string.Empty);

        public override void Write(Utf8JsonWriter writer, WorkloadPackId value, JsonSerializerOptions options) => writer.WriteStringValue(value.ToString());
    }
}