using PDF_Office.Properties;
using PDFSettings;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Regions;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace PDF_Office.ViewModels.EditTools.Background
{
    public class BackgroundTemplateListFileContentViewModel : BindableBase,INavigationAware
    {
        public ObservableCollection<BackgroundItem> backgroundModFileCollection = new ObservableCollection<BackgroundItem>();
        public ObservableCollection<BackgroundItem> BackgroundModFileCollection
        {
            get { return backgroundModFileCollection; }
            set
            {
                backgroundModFileCollection = value;
                RaisePropertyChanged();
            }
        }

        private Visibility _createTemplateVisible;
        public Visibility CreateTemplateVisible
        {
            get { return _createTemplateVisible; }
            set { SetProperty(ref _createTemplateVisible, value); }
        }

        public DelegateCommand AddTemplateCommand { get; set; }
        public DelegateCommand<object> DeleteTemplateItemCommand { get; set; }

        BackgroundTemplateListFileContentViewModel()
        {
            AddTemplateCommand = new DelegateCommand(AddTemplate);
            DeleteTemplateItemCommand = new DelegateCommand<object>(DeleteTemplateItem);

            InitBackgroundTemplateList();
        }

        private void CheckTemplateListIsEmpty(List<BackgroundItem> backgroundTemplateList)
        {
            if (backgroundTemplateList.Count() == 0)
            {
                CreateTemplateVisible = Visibility.Visible;
            }
            else
            {
                CreateTemplateVisible = Visibility.Collapsed;
            }
        }

        private void GetBackgroundSource()
        {
            List<BackgroundItem> backgroundModFileTemplateList = new List<BackgroundItem>();
            for (int temp = 0; temp < Settings.Default.BackgroundTemplateList.Count; temp++)
            {
                if (Settings.Default.BackgroundTemplateList[temp].type == ComPDFKit.PDFDocument.C_Background_Type.BG_TYPE_IMAGE)
                {
                    backgroundModFileTemplateList.Add(Settings.Default.BackgroundTemplateList[temp]);
                }
            }
            BackgroundModFileCollection = new ObservableCollection<BackgroundItem>(backgroundModFileTemplateList);
            CheckTemplateListIsEmpty(backgroundModFileTemplateList);
        }



        private void InitBackgroundTemplateList()
        {
            if (Settings.Default.BackgroundTemplateList == null)
            {
                Settings.Default.BackgroundTemplateList = new BackgroundTemplateList();
            }
            GetBackgroundSource();
        }

        private void UpdateBackgroundSources()
        {
            int count = backgroundModFileCollection.Count + backgroundModFileCollection.Count;
            List<BackgroundItem> backgroundModFileTemplateList = new List<BackgroundItem>();
            for (int temp = 0; temp < Settings.Default.BackgroundTemplateList.Count; temp++)
            {
                if (Settings.Default.BackgroundTemplateList[temp].type == ComPDFKit.PDFDocument.C_Background_Type.BG_TYPE_IMAGE)
                {
                    backgroundModFileTemplateList.Add(Settings.Default.BackgroundTemplateList[temp]);
                }
            }
            BackgroundModFileCollection = new ObservableCollection<BackgroundItem>(backgroundModFileTemplateList);
            CheckTemplateListIsEmpty(backgroundModFileTemplateList);
        }

        public void AddTemplate()
        {
            var backgroundItem = new BackgroundItem();
            backgroundItem.pageRange = "0";
            backgroundItem.type = ComPDFKit.PDFDocument.C_Background_Type.BG_TYPE_IMAGE;
            backgroundItem.templateName += Settings.Default.BackgroundIndex.ToString();
            Settings.Default.BackgroundTemplateList.Add(backgroundItem);
            Settings.Default.Save();
            UpdateBackgroundSources();
        }

        public void DeleteTemplateItem(object e)
        {
            var btn = e as System.Windows.Controls.Button;
            if (btn == null)
            {
                return;
            }
            var template = btn.DataContext as BackgroundItem;
            if (template == null)
            {
                return;
            }
            Settings.Default.AppProperties.NeedToDeletePath.Add(template.previeImagePath);
            Settings.Default.AppProperties.NeedToDeletePath.Add(template.imagepath);

            Settings.Default.BackgroundTemplateList.Remove(template);
            Settings.Default.Save();

            BackgroundModFileCollection.Remove(template);
            UpdateBackgroundSources();

        }

        public bool IsNavigationTarget(NavigationContext navigationContext)
        {
            return true;
        }

        public void OnNavigatedFrom(NavigationContext navigationContext)
        {
        }

        public void OnNavigatedTo(NavigationContext navigationContext)
        {
        }
    }
}