using System.Text.Json;
using DotBased.Monads;
using Manager.YouTube.Models.Innertube;

namespace Manager.YouTube.Parsers.Json;

public static class ChannelJsonParser
{
    public static Result<InnertubeChannel> ParseJsonToChannelData(string json)
    {
        try
        {
            var doc = JsonDocument.Parse(json);
            var rootDoc = doc.RootElement;
            
            var channelMetadata = rootDoc
                .GetProperty("metadata")
                .GetProperty("channelMetadataRenderer");

            var channelId = channelMetadata.GetProperty("externalId").GetString();
            if (channelId == null)
            {
                throw new InvalidOperationException("No channel id found.");
            }

            var channel = new InnertubeChannel
            {
                Id = channelId,
                ChannelName = channelMetadata.GetProperty("title").ToString(),
            };

            var microformat = rootDoc.GetProperty("microformat").GetProperty("microformatDataRenderer");

            channel.AvailableCountries = microformat
                .GetProperty("availableCountries")
                .EnumerateArray()
                .Select(e => e.GetString())
                .OfType<string>().ToList();
            channel.Description = microformat.GetProperty("description").GetString();
            channel.NoIndex = microformat.GetProperty("noindex").GetBoolean();
            channel.Unlisted = microformat.GetProperty("unlisted").GetBoolean();
            channel.FamilySafe = microformat.GetProperty("familySafe").GetBoolean();
            
            var avatarThumbnails = channelMetadata.GetProperty("avatar")
                .GetProperty("thumbnails")
                .EnumerateArray();
            channel.AvatarImages = JsonParser.ParseImages(avatarThumbnails);

            var headerContent = rootDoc
                .GetProperty("header")
                .GetProperty("pageHeaderRenderer")
                .GetProperty("content");

            channel.Handle = headerContent
                .GetProperty("pageHeaderViewModel")
                .GetProperty("metadata")
                .GetProperty("contentMetadataViewModel")
                .GetProperty("metadataRows")
                .EnumerateArray()
                .FirstOrDefault()
                .GetProperty("metadataParts")
                .EnumerateArray()
                .FirstOrDefault()
                .GetProperty("text")
                .GetProperty("content").GetString();

            var bannerImages = headerContent
                .GetProperty("pageHeaderViewModel")
                .GetProperty("banner")
                .GetProperty("imageBannerViewModel")
                .GetProperty("image")
                .GetProperty("sources")
                .EnumerateArray();
            channel.BannerImages = JsonParser.ParseImages(bannerImages);
            
            return channel;
        }
        catch (Exception e)
        {
            return ResultError.Error(e);
        }
    }
}