using System;
using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Serialization;
using Gallery.Util.Model;

namespace Gallery.Util
{
    public class GalleryItemConverter : JsonConverter<GalleryItem>
    {
        public override GalleryItem Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            if (reader.TokenType != JsonTokenType.StartObject)
            {
                return null;
            }
            var item = new GalleryItem();
            while (reader.Read())
            {
                if (reader.TokenType == JsonTokenType.EndObject)
                {
                    return item;
                }
                if (reader.TokenType == JsonTokenType.PropertyName)
                {
                    var name = reader.GetString();
                    reader.Read();
                    switch (name)
                    {
                        case nameof(GalleryItem.Id): item.Id = reader.GetInt64(); break;
                        case nameof(GalleryItem.Tags):
                            if (reader.TokenType == JsonTokenType.StartArray)
                            {
                                var tags = new List<string>();
                                while (reader.Read())
                                {
                                    if (reader.TokenType == JsonTokenType.EndArray)
                                    {
                                        break;
                                    }
                                    if (reader.TokenType == JsonTokenType.String)
                                    {
                                        tags.Add(reader.GetString());
                                    }
                                }
                                item.Tags = tags.ToArray();
                            }
                            break;
                        case nameof(GalleryItem.CreatedTime): item.CreatedTime = reader.GetDateTime(); break;
                        case nameof(GalleryItem.UpdatedTime): item.UpdatedTime = reader.GetDateTime(); break;
                        case nameof(GalleryItem.UserId): item.UserId = reader.GetString(); break;
                        case nameof(GalleryItem.UserName): item.UserName = reader.GetString(); break;
                        case nameof(GalleryItem.Source): item.Source = reader.GetString(); break;
                        case nameof(GalleryItem.PreviewUrl): item.PreviewUrl = reader.GetString(); break;
                        case nameof(GalleryItem.RawUrl): item.RawUrl = reader.GetString(); break;
                        case nameof(GalleryItem.Width): item.Width = reader.GetInt32(); break;
                        case nameof(GalleryItem.Height): item.Height = reader.GetInt32(); break;
                        case nameof(GalleryItem.BookmarkId): item.BookmarkId = reader.GetString(); break;
                        case nameof(GalleryItem.IsRawPage): item.IsRawPage = reader.GetBoolean(); break;
                    }
                }
            }
            throw new ArgumentOutOfRangeException();
        }

        public override void Write(Utf8JsonWriter writer, GalleryItem value, JsonSerializerOptions options)
        {
            if (value == null)
            {
                writer.WriteNullValue();
                return;
            }

            writer.WriteStartObject();

            writer.WriteNumber(nameof(GalleryItem.Id), value.Id);
            if (value.Tags != null)
            {
                writer.WritePropertyName(nameof(GalleryItem.Tags));
                writer.WriteStartArray();
                for (var i = 0; i < value.Tags.Length; i++)
                {
                    writer.WriteStringValue(value.Tags[i]);
                }
                writer.WriteEndArray();
            }
            writer.WriteString(nameof(GalleryItem.CreatedTime), value.CreatedTime);
            writer.WriteString(nameof(GalleryItem.UpdatedTime), value.UpdatedTime);
            writer.WriteString(nameof(GalleryItem.UserId), value.UserId);
            writer.WriteString(nameof(GalleryItem.UserName), value.UserName);
            writer.WriteString(nameof(GalleryItem.Source), value.Source);
            writer.WriteString(nameof(GalleryItem.PreviewUrl), value.PreviewUrl);
            writer.WriteString(nameof(GalleryItem.RawUrl), value.RawUrl);
            writer.WriteNumber(nameof(GalleryItem.Width), value.Width);
            writer.WriteNumber(nameof(GalleryItem.Height), value.Height);
            writer.WriteString(nameof(GalleryItem.BookmarkId), value.BookmarkId);
            writer.WriteBoolean(nameof(GalleryItem.IsRawPage), value.IsRawPage);

            writer.WriteEndObject();
        }
    }
}