// <copyright file="TagsList.cs" company="OpenTelemetry Authors">
// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>

using System.Text;

namespace OpenTelemetry.AutoInstrumentation.Tagging;

internal abstract class TagsList : ITags
{
    public List<KeyValuePair<string, string>> GetAllTags()
    {
        var additionalTags = GetAdditionalTags();
        var allTags = new List<KeyValuePair<string, string>>(
            additionalTags?.Length ?? 0);

        if (additionalTags != null)
        {
            lock (additionalTags)
            {
                foreach (var property in additionalTags)
                {
                    var value = property.Getter(this);

                    if (value != null)
                    {
                        allTags.Add(new KeyValuePair<string, string>(property.Key, value));
                    }
                }
            }
        }

        return allTags;
    }

    public override string ToString()
    {
        var sb = new StringBuilder();

        foreach (var property in GetAdditionalTags())
        {
            var value = property.Getter(this);

            if (value != null)
            {
                sb.Append($"{property.Key} (tag):{value},");
            }
        }

        return sb.ToString();
    }

    protected virtual IProperty<string?>[] GetAdditionalTags() => Array.Empty<IProperty<string?>>();
}
