// Copyright (C) 2024, The Duplicati Team
// https://duplicati.com, hello@duplicati.com
// 
// Permission is hereby granted, free of charge, to any person obtaining a 
// copy of this software and associated documentation files (the "Software"), 
// to deal in the Software without restriction, including without limitation 
// the rights to use, copy, modify, merge, publish, distribute, sublicense, 
// and/or sell copies of the Software, and to permit persons to whom the 
// Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in 
// all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
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// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using Duplicati.Library.Interface;
using Newtonsoft.Json;
using Newtonsoft.Json.Converters;
using Newtonsoft.Json.Serialization;

namespace Duplicati.Library.Modules.Builtin.ResultSerialization
{
    /// <summary>
    /// Implements serialization of results to JSON
    /// </summary>
    public class JsonFormatSerializer : IResultFormatSerializer
    {
        /// <summary>
        /// Helper to filter the result classes properties
        /// </summary>
        private class DynamicContractResolver : DefaultContractResolver
        {
            /// <summary>
            /// List of names to exclude
            /// </summary>
            private readonly HashSet<string> m_excludes;
            /// <summary>
            /// Initializes a new instance of the
            /// <see cref="T:Duplicati.Library.Modules.Builtin.SendHttpMessage.DynamicContractResolver"/> class.
            /// </summary>
            /// <param name="names">The names to exclude.</param>
            public DynamicContractResolver(params string[] names)
            {
                m_excludes = new HashSet<string>(names);
            }

            /// <summary>
            /// Creates a filtered list of properties
            /// </summary>
            /// <returns>The filtered properties.</returns>
            /// <param name="type">The type to create the list for.</param>
            /// <param name="memberSerialization">Member serialization parameter.</param>
            protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
            {
                return base
                    .CreateProperties(type, memberSerialization)
                    .Where(x => !m_excludes.Contains(x.PropertyName))
                    .Where(x => !typeof(Task).IsAssignableFrom(x.PropertyType))
                    .ToList();
            }
        }

        /// <summary>
        /// Serialize the specified result and logLines.
        /// </summary>
        /// <returns>The serialized result string.</returns>
        /// <param name="result">The result to serialize.</param>
        /// <param name="exception">The exception, if any</param>
        /// <param name="loglines">The log lines to serialize.</param>
        /// <param name="additional">Additional parameters to include</param>
        public string Serialize(object result, Exception exception, IEnumerable<string> loglines, Dictionary<string, string> additional)
        {
            return JsonConvert.SerializeObject(
                new
                {
                    Data = result,
                    Extra = additional,
                    LogLines = loglines,
                    Exception = exception?.ToString()
                }, 
                
                new JsonSerializerSettings()
                {
                    ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
                    ContractResolver = new DynamicContractResolver(
                            nameof(IBasicResults.Warnings),
                            nameof(IBasicResults.Errors),
                            nameof(IBasicResults.Messages),
                            "TaskReader"
                    ),
                    Converters = new List<JsonConverter>()
                    {
                        new StringEnumConverter()
                    }
                }
            );
        }

        public string SerializeResults(IBasicResults result)
        {
            return JsonConvert.SerializeObject(
                result,
                new JsonSerializerSettings()
                {
                    ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
                    ContractResolver = new DynamicContractResolver(
                            nameof(IBackendStatstics),
                            "TaskReader"
                    ),
                    Converters = new List<JsonConverter>()
                    {
                        new StringEnumConverter()
                    }
                }
            );
        }

        /// <summary>
        /// Returns the format that the serializer represents
        /// </summary>
        public ResultExportFormat Format => ResultExportFormat.Json;
    }
}