// Jellyfin.Versioning/ExtendedVersion.cs
// Part of the Jellyfin project (https://jellyfin.media)
//
//    All copyright belongs to the Jellyfin contributors; a full list can
//    be found in the file CONTRIBUTORS.md
//
//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 2 of the License, or
//    (at your option) any later version.
//
//    This program is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with this program. If not, see <https://www.gnu.org/licenses/>.


using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.Serialization;
using System.Text;

namespace Jellyfin.Versioning
{
    public class ExtendedVersion
    {
        [IgnoreDataMember]
        public Version ApiVersion { get; }

        public string CommitHash { get; } = String.Empty;

        public long Revision { get; } = 0;

        public string Branch { get; } = String.Empty;

        public string TagDescription { get; } = String.Empty;

        [IgnoreDataMember]
        public Uri Remote { get; } = null;

        public ExtendedVersion(Version apiVersion, Stream extendedVersionFileStream)
        {
            ApiVersion = apiVersion;
            int line = 1;
            using (var reader = new StreamReader(extendedVersionFileStream))
            {
                while (!reader.EndOfStream)
                {
                    string item = reader.ReadLine();

                    if (string.IsNullOrWhiteSpace(item.Trim()))
                    {
                        //empty line, skip
                        continue;
                    }
                    var kvpair = item.Split('=');
                    if (kvpair.Length != 2)
                    {
                        throw new ArgumentException(nameof(extendedVersionFileStream),
                            $"ExtendedVersionFile contains bad key-value pair '{item}' at line {line}.");
                    }
                    var key = kvpair[0].Trim().ToLower();
                    var value = kvpair[1].Trim();
                    switch (key)
                    {
                        case "commit":
                            if (value.Length < 7 || value.Length > 40)
                            {
                                throw new ArgumentException(nameof(extendedVersionFileStream),
                                    $"ExtendedVersionFile has a bad commit hash '{value}' on line {line}, it should be a string between 7 and 40 characters.");
                            }
                            CommitHash = value;
                            break;
                        case "branch":
                            if (string.IsNullOrWhiteSpace(value))
                            {
                                throw new ArgumentException(nameof(extendedVersionFileStream),
                                    $"ExtendedVersionFile has a bad branch '{value}' on line {line}, it can not be empty.");
                            }
                            Branch = value;
                            break;
                        case "revision":
                            if (!long.TryParse(value, out long rev))
                            {
                                throw new ArgumentException(nameof(extendedVersionFileStream),
                                    $"ExtendedVersionFile has a bad revision '{value}' on line {line}, it should be an integer.");
                            }
                            Revision = rev;
                            break;
                        case "tagdesc":
                            if (string.IsNullOrWhiteSpace(value))
                            {
                                throw new ArgumentException(nameof(extendedVersionFileStream),
                                    $"ExtendedVersionFile has a bad tag description '{value}' on line {line}, it can not be empty.");
                            }
                            TagDescription = value;
                            break;
                        case "remote":
                            var remoteRepo = value.Replace(".git", string.Empty).Replace("git@github.com:", "https://github.com/");
                            if (Uri.IsWellFormedUriString(remoteRepo, UriKind.Absolute))
                            {
                                Remote = new Uri(remoteRepo);
                            }
                            else if (Uri.IsWellFormedUriString(value, UriKind.Absolute))
                            {
                                //fallback if the replace about broke the Uri
                                Remote = new Uri(value);
                            }
                            else
                            {
                                throw new ArgumentException(nameof(extendedVersionFileStream),
                                    $"ExtendedVersionFile has a bad remote URI '{value}' on line {line}, it should be a valid remote URI (ssh or https).");
                            }
                            break;
                        default:
                            throw new ArgumentException(nameof(extendedVersionFileStream),
                            $"ExtendedVersionFile contains an unrecognized key-value pair '{item}' at line {line}.");
                    }
                    line++;
                }
            }
        }

        public override string ToString()
        {
            return $"{ApiVersion};{CommitHash};{Revision};{Branch};{TagDescription};{Remote}";
        }
    }
}