using System;
using System.Collections.ObjectModel;
using System.Linq;
using Xamarin.Essentials;
using Xamarin.Forms;

namespace Project1503
{
    public partial class HistoryPage : ContentPage
    {
        private ObservableCollection<HistoryItemModel> historyItems;

        public HistoryPage()
        {
            InitializeComponent();
            historyItems = LoadHistoryFromPreferences();
            historyListView.ItemsSource = historyItems;
        }

        private ObservableCollection<HistoryItemModel> LoadHistoryFromPreferences()
        {
            var serializedHistory = Preferences.Get("inventoryHistory", string.Empty);
            var historyList = string.IsNullOrWhiteSpace(serializedHistory)
                ? new ObservableCollection<HistoryItemModel>()
                : Newtonsoft.Json.JsonConvert.DeserializeObject<ObservableCollection<HistoryItemModel>>(serializedHistory);

            // Order the historyList by DateAdded in descending order
            return new ObservableCollection<HistoryItemModel>(historyList.OrderByDescending(item => item.DateAdded));
        }

        private void SaveHistoryToPreferences()
        {
            var serializedHistory = Newtonsoft.Json.JsonConvert.SerializeObject(historyItems);
            Preferences.Set("inventoryHistory", serializedHistory);
        }

        private async void OnHistoryItemSelected(object sender, SelectedItemChangedEventArgs e)
        {
            if (e.SelectedItem == null)
                return;

            var selectedItem = (HistoryItemModel)e.SelectedItem;

            await DisplayAlert("History Details",
                $"Action: {selectedItem.Action}\n" +
                $"Name: {selectedItem.ItemName}\n" +
                $"Tag Number: {selectedItem.TagNumber}\n" +
                $"Shelf Number: {selectedItem.ShelfNumber}\n" +
                $"Quantity: {selectedItem.Quantity}\n" +
                $"Description: {selectedItem.Description}\n" +
                $"Date: {selectedItem.DateAdded}",
                "OK");

            ((ListView)sender).SelectedItem = null;
        }

        // Add the "Delete History" button handler
        private async void OnDeleteHistoryClicked(object sender, EventArgs e)
        {
            var result = await DisplayAlert("Delete History", "Are you sure you want to delete all history?", "Yes", "No");
            if (result)
            {
                // Clear the historyItems collection
                historyItems.Clear();
                SaveHistoryToPreferences(); // Save changes after clearing history
            }
        }
    }
        public class HistoryItemModel
        {
            public string Action { get; set; }
            public string ItemName { get; set; }
            public string TagNumber { get; set; }
            public string ShelfNumber { get; set; }
            public string Quantity { get; set; }
            public string Description { get; set; }
            public DateTime DateAdded { get; set; }
        }
    
}