using System.Net;

namespace Manager.YouTube.Parsers;

public static class CookieTxtParser
{
    public static async Task<CookieCollection> ParseAsync(Stream stream, HashSet<string>? allowedCookies = null)
    {
        var cookieCollection = new CookieCollection();
        
        using var reader = new StreamReader(stream);
        while (await reader.ReadLineAsync() is { } line)
        {
            if (string.IsNullOrWhiteSpace(line) || line.StartsWith('#'))
            {
                continue;
            }

            var lineParts = line.Split('\t');
            if (lineParts.Length < 7)
            {
                continue;
            }

            var domain = lineParts[0];
            //var includeSubdomains = lineParts[1].Equals("TRUE", StringComparison.OrdinalIgnoreCase);
            var path = lineParts[2];
            var secure = lineParts[3].Equals("TRUE", StringComparison.OrdinalIgnoreCase);
            var unixExpiry = long.TryParse(lineParts[4], out var exp) ? exp : 0;
            var name = lineParts[5];
            var value = lineParts[6];
            
            if (!allowedCookies?.Contains(name) ?? false)
            {
                continue;
            }

            var cookie = new Cookie(name, value, path, domain)
            {
                Secure = secure
            };
            
            if (unixExpiry is > 0 and < int.MaxValue)
            {
                cookie.Expires = DateTimeOffset.FromUnixTimeSeconds(unixExpiry).DateTime;
            }

            cookieCollection.Add(cookie);
        }

        return cookieCollection;
    }
}