using System;
using System.Collections.Generic;
using System.Linq;
using TranslateTool.Managers;
using TranslateTool.Model;

namespace TranslateTool.ViewModel
{
    public class HandleRepaetItemPageViewModel:ViewModel
    {
        private readonly List<RepeatItem> _items;
        private readonly string _languageName;
        private readonly ClientManager _clientManager;
        private RepeatItem _repeatItem;
        private string _key;
        private List<string> _contents;
        private bool _isLastItem;
        private string _selectContent;
        private string _repeatMessage;

        public string RepeatMessage
        {
            get => _repeatMessage;
            set
            {
                if (_repeatMessage != value)
                {
                    _repeatMessage = value;
                    OnPropertyChanged(() => RepeatMessage);
                }
            }
        }
        public string SelectContent
        {
            get => _selectContent;
            set
            {
                if (_selectContent != value)
                {
                    _selectContent = value;
                    OnPropertyChanged(() => SelectContent);
                }
            }
        }

        public bool IsLastItem
        {
            get => _isLastItem;
            set
            {
                if (_isLastItem != value)
                {
                    _isLastItem = value;
                    OnPropertyChanged(() => IsLastItem);
                }
            }
        }

        public List<string> Contents
        {
            get => _contents;
            set
            {
                if (_contents != value)
                {
                    _contents = value;
                    SelectContent = string.Empty;
                    OnPropertyChanged(() => Contents);
                }
            }
        }

        public string Key
        {
            get => _key;
            set
            {
                if (_key != value)
                {
                    _key = value;
                    OnPropertyChanged(() => Key);
                }
            }
        }
        
        public ButtonCommand NextCommand { get; }

        public ButtonCommand FinishCommand { get; }

        public HandleRepaetItemPageViewModel(string languageName, List<RepeatItem> repeatItems)
        {
            _clientManager = ClientManager.CreateInstance();
            _languageName = languageName;
            _items = repeatItems;
            NextCommand = new ButtonCommand(OnNext, "Next");
            FinishCommand = new ButtonCommand(OnFinish, "Finish");
            _repeatItem = repeatItems.First();
            Key = _repeatItem.Key;
            Contents = new List<string>(_repeatItem.Contents);
            RepeatMessage = $"有{_items.Count}条重复内容，请选择要使用的内容！";
        }

        private void OnFinish(object obj)
        {
            if (!string.IsNullOrEmpty(_selectContent))
            {
                _clientManager.UpdateItemValue(_languageName,_key,_selectContent);
            }

            OnClosedRequest();
        }

        private void OnNext(object obj)
        {
            if (!string.IsNullOrEmpty(_selectContent))
            {
                _clientManager.UpdateItemValue(_languageName, _key, _selectContent);
            }
            var index = _items.IndexOf(_repeatItem);
            if (index < _items.Count)
            {
                if (index == _items.Count - 2 )
                {
                    IsLastItem = true;
                }
                _repeatItem = _items[index + 1];
                
                Key = _repeatItem.Key;
                Contents = new List<string>(_repeatItem.Contents);
            }
        }
    }
}