---

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Eas4Installer.Services.Services
{
    public static class RpmServiceParser
    {
        private static readonly Regex RpmRegex = new Regex(
            @"^(?<name>.+)-(?<version>\d+(?:\.\d+)*)-(?<release>(?<releaseType>alpha|build)(?<releaseNumber>\d+)|alt\d+)\.(?<arch>[^.]+)\.rpm$",
            RegexOptions.Compiled | RegexOptions.IgnoreCase
        );

        public static ServicePackageInfo? Parse(string lineOrFileName)
        {
            if (string.IsNullOrWhiteSpace(lineOrFileName))
                return null;

            string fileName = ExtractFileName(lineOrFileName);

            Match match = RpmRegex.Match(fileName);

            if (!match.Success)
                return null;

            string rawServiceName = match.Groups["name"].Value;
            string version = match.Groups["version"].Value;
            string release = match.Groups["release"].Value;
            string releaseType = match.Groups["releaseType"].Value;
            string releaseNumber = match.Groups["releaseNumber"].Value;
            string architecture = match.Groups["arch"].Value;

            string serviceName = NormalizeServiceName(rawServiceName);

            var result = new ServicePackageInfo
            {
                FileName = fileName,
                ServiceName = serviceName,
                Version = version,
                Release = release,
                Architecture = architecture
            };

            if (releaseType.Equals("alpha", StringComparison.OrdinalIgnoreCase))
                result.AlphaVersion = int.Parse(releaseNumber);

            if (releaseType.Equals("build", StringComparison.OrdinalIgnoreCase))
                result.BuildVersion = int.Parse(releaseNumber);

            return result;
        }

        private static string ExtractFileName(string lineOrFileName)
        {
            string value = lineOrFileName.Trim();

            // Если передали строку из листинга:
            // eas4-cart-8.3.0-build15040.x86_64.rpm 18-Jun-2026 13:56 45965188
            value = value.Split(' ', StringSplitOptions.RemoveEmptyEntries)[0];

            // Если передали ссылку:
            // https://site.ru/repo/eas4-cart-8.3.0-build15040.x86_64.rpm
            int queryIndex = value.IndexOf('?');
            if (queryIndex >= 0)
                value = value.Substring(0, queryIndex);

            int lastSlashIndex = value.LastIndexOf('/');
            if (lastSlashIndex >= 0)
                value = value.Substring(lastSlashIndex + 1);

            return value;
        }

        private static string NormalizeServiceName(string rawServiceName)
        {
            var ignoredParts = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
            {
                "backend",
                "debuginfo"
            };

            return string.Join(
                "-",
                rawServiceName
                    .Split('-', StringSplitOptions.RemoveEmptyEntries)
                    .Where(part => !ignoredParts.Contains(part))
            );
        }
    }

    public class ServicePackageInfo
    {
        public string FileName { get; set; } = string.Empty;

        public string ServiceName { get; set; } = string.Empty;

        public string Version { get; set; } = string.Empty;

        public int? AlphaVersion { get; set; }

        public int? BuildVersion { get; set; }

        public string? Release { get; set; }

        public string Architecture { get; set; } = string.Empty;

        public override string ToString()
        {
            return
                $"FileName: {FileName}, " +
                $"ServiceName: {ServiceName}, " +
                $"Version: {Version}, " +
                $"AlphaVersion: {AlphaVersion?.ToString() ?? "-"}, " +
                $"BuildVersion: {BuildVersion?.ToString() ?? "-"}, " +
                $"Release: {Release ?? "-"}, " +
                $"Architecture: {Architecture}";
        }
    }
    
}