#region License
// Copyright (c) 2007 James Newton-King
//
// 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
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
// OTHER DEALINGS IN THE SOFTWARE.
#endregion

#if HAVE_ASYNC

using System;
using System.Globalization;
using System.Threading;
using System.Threading.Tasks;
using LC.Newtonsoft.Json.Utilities;

namespace LC.Newtonsoft.Json.Linq
{
    public abstract partial class JToken
    {
        /// <summary>
        /// Writes this token to a <see cref="JsonWriter"/> asynchronously.
        /// </summary>
        /// <param name="writer">A <see cref="JsonWriter"/> into which this method will write.</param>
        /// <param name="cancellationToken">The token to monitor for cancellation requests.</param>
        /// <param name="converters">A collection of <see cref="JsonConverter"/> which will be used when writing the token.</param>
        /// <returns>A <see cref="Task"/> that represents the asynchronous write operation.</returns>
        public virtual Task WriteToAsync(JsonWriter writer, CancellationToken cancellationToken, params JsonConverter[] converters)
        {
            throw new NotImplementedException();
        }

        /// <summary>
        /// Writes this token to a <see cref="JsonWriter"/> asynchronously.
        /// </summary>
        /// <param name="writer">A <see cref="JsonWriter"/> into which this method will write.</param>
        /// <param name="converters">A collection of <see cref="JsonConverter"/> which will be used when writing the token.</param>
        /// <returns>A <see cref="Task"/> that represents the asynchronous write operation.</returns>
        public Task WriteToAsync(JsonWriter writer, params JsonConverter[] converters)
        {
            return WriteToAsync(writer, default, converters);
        }

        /// <summary>
        /// Asynchronously creates a <see cref="JToken"/> from a <see cref="JsonReader"/>.
        /// </summary>
        /// <param name="reader">An <see cref="JsonReader"/> positioned at the token to read into this <see cref="JToken"/>.</param>
        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
        /// <returns>
        /// A <see cref="Task{TResult}"/> that represents the asynchronous creation. The
        /// <see cref="Task{TResult}.Result"/> property returns a <see cref="JToken"/> that contains 
        /// the token and its descendant tokens
        /// that were read from the reader. The runtime type of the token is determined
        /// by the token type of the first token encountered in the reader.
        /// </returns>
        public static Task<JToken> ReadFromAsync(JsonReader reader, CancellationToken cancellationToken = default)
        {
            return ReadFromAsync(reader, null, cancellationToken);
        }

        /// <summary>
        /// Asynchronously creates a <see cref="JToken"/> from a <see cref="JsonReader"/>.
        /// </summary>
        /// <param name="reader">An <see cref="JsonReader"/> positioned at the token to read into this <see cref="JToken"/>.</param>
        /// <param name="settings">The <see cref="JsonLoadSettings"/> used to load the JSON.
        /// If this is <c>null</c>, default load settings will be used.</param>
        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
        /// <returns>
        /// A <see cref="Task{TResult}"/> that represents the asynchronous creation. The
        /// <see cref="Task{TResult}.Result"/> property returns a <see cref="JToken"/> that contains 
        /// the token and its descendant tokens
        /// that were read from the reader. The runtime type of the token is determined
        /// by the token type of the first token encountered in the reader.
        /// </returns>
        public static async Task<JToken> ReadFromAsync(JsonReader reader, JsonLoadSettings? settings, CancellationToken cancellationToken = default)
        {
            ValidationUtils.ArgumentNotNull(reader, nameof(reader));

            if (reader.TokenType == JsonToken.None)
            {
                if (!await (settings != null && settings.CommentHandling == CommentHandling.Ignore ? reader.ReadAndMoveToContentAsync(cancellationToken) : reader.ReadAsync(cancellationToken)).ConfigureAwait(false))
                {
                    throw JsonReaderException.Create(reader, "Error reading JToken from JsonReader.");
                }
            }

            IJsonLineInfo? lineInfo = reader as IJsonLineInfo;

            switch (reader.TokenType)
            {
                case JsonToken.StartObject:
                    return await JObject.LoadAsync(reader, settings, cancellationToken).ConfigureAwait(false);
                case JsonToken.StartArray:
                    return await JArray.LoadAsync(reader, settings, cancellationToken).ConfigureAwait(false);
                case JsonToken.StartConstructor:
                    return await JConstructor.LoadAsync(reader, settings, cancellationToken).ConfigureAwait(false);
                case JsonToken.PropertyName:
                    return await JProperty.LoadAsync(reader, settings, cancellationToken).ConfigureAwait(false);
                case JsonToken.String:
                case JsonToken.Integer:
                case JsonToken.Float:
                case JsonToken.Date:
                case JsonToken.Boolean:
                case JsonToken.Bytes:
                    JValue v = new JValue(reader.Value);
                    v.SetLineInfo(lineInfo, settings);
                    return v;
                case JsonToken.Comment:
                    v = JValue.CreateComment(reader.Value?.ToString());
                    v.SetLineInfo(lineInfo, settings);
                    return v;
                case JsonToken.Null:
                    v = JValue.CreateNull();
                    v.SetLineInfo(lineInfo, settings);
                    return v;
                case JsonToken.Undefined:
                    v = JValue.CreateUndefined();
                    v.SetLineInfo(lineInfo, settings);
                    return v;
                default:
                    throw JsonReaderException.Create(reader, "Error reading JToken from JsonReader. Unexpected token: {0}".FormatWith(CultureInfo.InvariantCulture, reader.TokenType));
            }
        }

        /// <summary>
        /// Asynchronously creates a <see cref="JToken"/> from a <see cref="JsonReader"/>.
        /// </summary>
        /// <param name="reader">A <see cref="JsonReader"/> positioned at the token to read into this <see cref="JToken"/>.</param>
        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
        /// <returns>
        /// A <see cref="Task{TResult}"/> that represents the asynchronous creation. The <see cref="Task{TResult}.Result"/>
        /// property returns a <see cref="JToken"/> that contains the token and its descendant tokens
        /// that were read from the reader. The runtime type of the token is determined
        /// by the token type of the first token encountered in the reader.
        /// </returns>
        public static Task<JToken> LoadAsync(JsonReader reader, CancellationToken cancellationToken = default)
        {
            return LoadAsync(reader, null, cancellationToken);
        }

        /// <summary>
        /// Asynchronously creates a <see cref="JToken"/> from a <see cref="JsonReader"/>.
        /// </summary>
        /// <param name="reader">A <see cref="JsonReader"/> positioned at the token to read into this <see cref="JToken"/>.</param>
        /// <param name="settings">The <see cref="JsonLoadSettings"/> used to load the JSON.
        /// If this is <c>null</c>, default load settings will be used.</param>
        /// <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="CancellationToken.None"/>.</param>
        /// <returns>
        /// A <see cref="Task{TResult}"/> that represents the asynchronous creation. The <see cref="Task{TResult}.Result"/>
        /// property returns a <see cref="JToken"/> that contains the token and its descendant tokens
        /// that were read from the reader. The runtime type of the token is determined
        /// by the token type of the first token encountered in the reader.
        /// </returns>
        public static Task<JToken> LoadAsync(JsonReader reader, JsonLoadSettings? settings, CancellationToken cancellationToken = default)
        {
            return ReadFromAsync(reader, settings, cancellationToken);
        }
    }
}

#endif