using System.Text;
using System.Text.Json;
using System.Text.Json.Nodes;
using Manager.YouTube.Models.Innertube;

namespace Manager.YouTube.Parsers.Json;

public static class JsonParser
{
    public static List<WebImage> ParseImages(JsonElement.ArrayEnumerator array) =>
        array
            .Select(image => new WebImage { Width = image.GetProperty("width").GetInt32(), Height = image.GetProperty("height").GetInt32(), Url = image.GetProperty("url").GetString() ?? "" })
            .ToList();
    
    public static string ExtractTextOrHtml(JsonElement element)
    {
        // Case 1: Simple text (no formatting)
        if (element.TryGetProperty("simpleText", out var simpleText))
            return simpleText.GetString() ?? string.Empty;

        // Case 2: Runs (formatted text segments)
        if (element.TryGetProperty("runs", out var runs) && runs.ValueKind == JsonValueKind.Array)
        {
            var sb = new StringBuilder();

            foreach (var run in runs.EnumerateArray())
            {
                var text = run.GetProperty("text").GetString() ?? string.Empty;
                var formatted = System.Net.WebUtility.HtmlEncode(text);

                var bold = run.TryGetProperty("bold", out var boldProp) && boldProp.GetBoolean();
                var italic = run.TryGetProperty("italic", out var italicProp) && italicProp.GetBoolean();
                var underline = run.TryGetProperty("underline", out var underlineProp) && underlineProp.GetBoolean();
                var strikethrough = run.TryGetProperty("strikethrough", out var strikeProp) && strikeProp.GetBoolean();

                if (bold) formatted = $"<b>{formatted}</b>";
                if (italic) formatted = $"<i>{formatted}</i>";
                if (underline) formatted = $"<u>{formatted}</u>";
                if (strikethrough) formatted = $"<s>{formatted}</s>";

                if (run.TryGetProperty("navigationEndpoint", out var nav) &&
                    nav.TryGetProperty("url", out var urlProp))
                {
                    var url = urlProp.GetString();
                    if (!string.IsNullOrEmpty(url))
                        formatted = $"<a href=\"{url}\">{formatted}</a>";
                }

                if (run.TryGetProperty("emoji", out var emoji) && emoji.ValueKind == JsonValueKind.Object)
                {
                    if (emoji.TryGetProperty("url", out var emojiUrl))
                    {
                        var src = emojiUrl.GetString();
                        if (!string.IsNullOrEmpty(src))
                            formatted = $"<img src=\"{src}\" alt=\"{text}\" class=\"emoji\" />";
                    }
                }

                sb.Append(formatted);
            }

            return sb.ToString();
        }

        return string.Empty;
    }
    
    public static List<WebImage> ExtractWebImages(JsonElement element)
    {
        var thumbnailsArray = element.GetProperty("thumbnail").GetProperty("thumbnails");
        return thumbnailsArray.Deserialize<List<WebImage>>() ?? [];
    }
}