using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.IO;
using System.Threading.Tasks;

namespace SourceGit.ViewModels
{
    public class Apply : Popup
    {
        [Required(ErrorMessage = "Patch file is required!!!")]
        [CustomValidation(typeof(Apply), nameof(ValidatePatchFile))]
        public string PatchFile
        {
            get => _patchFile;
            set => SetProperty(ref _patchFile, value, true);
        }

        public bool IgnoreWhiteSpace
        {
            get => _ignoreWhiteSpace;
            set => SetProperty(ref _ignoreWhiteSpace, value);
        }

        public List<Models.ApplyWhiteSpaceMode> WhiteSpaceModes
        {
            get;
            private set;
        }

        public Models.ApplyWhiteSpaceMode SelectedWhiteSpaceMode
        {
            get;
            set;
        }

        public Apply(Repository repo)
        {
            _repo = repo;

            WhiteSpaceModes = new List<Models.ApplyWhiteSpaceMode> {
                new Models.ApplyWhiteSpaceMode("Apply.NoWarn", "Apply.NoWarn.Desc", "nowarn"),
                new Models.ApplyWhiteSpaceMode("Apply.Warn", "Apply.Warn.Desc", "warn"),
                new Models.ApplyWhiteSpaceMode("Apply.Error", "Apply.Error.Desc", "error"),
                new Models.ApplyWhiteSpaceMode("Apply.ErrorAll", "Apply.ErrorAll.Desc", "error-all")
            };
            SelectedWhiteSpaceMode = WhiteSpaceModes[0];

            View = new Views.Apply() { DataContext = this };
        }

        public static ValidationResult ValidatePatchFile(string file, ValidationContext _)
        {
            if (File.Exists(file))
            {
                return ValidationResult.Success;
            }

            return new ValidationResult($"File '{file}' can NOT be found!!!");
        }

        public override Task<bool> Sure()
        {
            _repo.SetWatcherEnabled(false);
            ProgressDescription = "Apply patch...";

            return Task.Run(() =>
            {
                var succ = new Commands.Apply(_repo.FullPath, _patchFile, _ignoreWhiteSpace, SelectedWhiteSpaceMode.Arg, null).Exec();
                CallUIThread(() => _repo.SetWatcherEnabled(true));
                return succ;
            });
        }

        private readonly Repository _repo = null;
        private string _patchFile = string.Empty;
        private bool _ignoreWhiteSpace = true;
    }
}