using System;
using System.Collections.Generic;

using Avalonia;

namespace SourceGit.Models
{
    public class Commit
    {
        public string SHA { get; set; } = string.Empty;
        public User Author { get; set; } = User.Invalid;
        public ulong AuthorTime { get; set; } = 0;
        public User Committer { get; set; } = User.Invalid;
        public ulong CommitterTime { get; set; } = 0;
        public string Body { get; set; } = string.Empty;
        public List<string> Parents { get; set; } = new List<string>();
        public List<Decorator> Decorators { get; set; } = new List<Decorator>();
        public bool HasDecorators => Decorators.Count > 0;
        public bool IsMerged { get; set; } = false;
        public Thickness Margin { get; set; } = new Thickness(0);

        public string Subject
        {
            get
            {
                var end = Body.IndexOf("\r\n\r\n", StringComparison.Ordinal);
                if (end == -1)
                {
                    end = Body.IndexOf("\n\n", StringComparison.Ordinal);
                    if (end > 0)
                        return Body.Substring(0, end).Replace("\n", "", StringComparison.Ordinal);

                    return Body.Replace("\n", " ", StringComparison.Ordinal);
                }

                return Body.Substring(0, end).Replace("\r\n", " ", StringComparison.Ordinal);
            }
        }

        public string AuthorTimeStr => _utcStart.AddSeconds(AuthorTime).ToString("yyyy/MM/dd HH:mm:ss");
        public string CommitterTimeStr => _utcStart.AddSeconds(CommitterTime).ToString("yyyy/MM/dd HH:mm:ss");
        public string AuthorTimeShortStr => _utcStart.AddSeconds(AuthorTime).ToString("yyyy/MM/dd");
        public string CommitterTimeShortStr => _utcStart.AddSeconds(CommitterTime).ToString("yyyy/MM/dd");

        public bool IsCommitterVisible => Author != Committer || AuthorTime != CommitterTime;
        public bool IsCurrentHead => Decorators.Find(x => x.Type is DecoratorType.CurrentBranchHead or DecoratorType.CurrentCommitHead) != null;

        private static readonly DateTime _utcStart = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).ToLocalTime();
    }
}