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

namespace Manager.YouTube.Parsers.Json;

/// <summary>
/// Parsing functionality for the response from the innertube browse endpoint.
/// </summary>
public static class ChannelJsonParser
{
    public static Result<ChannelFetch> ParseJsonToChannelData(string json)
    {
        try
        {
            var doc = JsonDocument.Parse(json);
            var rootDoc = doc.RootElement;

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

            var availableCountries = microformat
                .GetProperty("availableCountries")
                .EnumerateArray()
                .Select(e => e.GetString())
                .ToList();

            var description = microformat.GetProperty("description").GetString();
            var noIndex = microformat.GetProperty("noindex").GetBoolean();
            var unlisted = microformat.GetProperty("unlisted").GetBoolean();
            var familySafe = microformat.GetProperty("familySafe").GetBoolean();

            var avatarThumbnails = rootDoc
                .GetProperty("metadata")
                .GetProperty("channelMetadataRenderer")
                .GetProperty("avatar")
                .GetProperty("thumbnails")
                .EnumerateArray();

            var avatars = JsonParser.ParseImages(avatarThumbnails);

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

            var metadataPartHandle = 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();

            var banners = JsonParser.ParseImages(bannerImages);

            var resultFetch = new ChannelFetch
            {
                NoIndex = noIndex,
                Unlisted = unlisted,
                FamilySafe = familySafe,
                Handle = metadataPartHandle,
                Description = description,
                AvailableCountries = availableCountries.OfType<string>().ToList(),
                AvatarImages = avatars,
                BannerImages = banners
            };
            return resultFetch;
        }
        catch (Exception e)
        {
            return ResultError.Error(e);
        }
    }
}