using Microsoft.AspNetCore.Components;
using System.ComponentModel;
using System.Globalization;
using System.Text.Json;
using Neighbourhood.omg.lol.Models;
using System.Runtime.CompilerServices;

namespace Neighbourhood.omg.lol {
  public class State : INotifyPropertyChanged {

    // Events
    public event EventHandler<EventArgs>? IntentReceived;
    public event PropertyChangedEventHandler? PropertyChanged;

    // Create the OnPropertyChanged method to raise the event
    // The calling member's name will be used as the parameter.
    protected void OnPropertyChanged([CallerMemberName] string? name = null) => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
    protected void OnIntentRecieved() => IntentReceived?.Invoke(this, EventArgs.Empty);

    // Main data lists
    public List<Status>? Statuses { get; set; }
    public List<Pic>? Pics { get; set; }
    public List<NowData>? NowGarden { get; set; }
    public List<MarkupString>? EphemeralMessages { get; set; }
    public List<string>? AddressDirectory { get; set; }

    public List<FeedItem>? Feed { get; set; }

    public Dictionary<string, Theme>? Themes { get; set; }

    // Account data
    private AccountResponseData? _accountInfo;
    public AccountResponseData? AccountInfo {
      get => _accountInfo;
      set {
        _accountInfo = value;
        OnPropertyChanged(nameof(AccountInfo));
      }
    }
    public AddressResponseList? AddressList { get; set; }

    public bool IsAuthorized { get => AccountInfo != null; }
    public string? Name { get => AccountInfo?.Name; }
    public string? Email { get => AccountInfo?.Email; }
    public IEnumerable<string>? AddressNames { get => AddressList?.Select(a => a.Address); }

    // Selected Address
    private AddressResponseData? _selectedAddress;
    public AddressResponseData? SelectedAddress {
      get {
        if (_selectedAddress == null) {
          string selectedAddressJson = Preferences.Default.Get("selectedaddress", string.Empty);
          if (!string.IsNullOrEmpty(selectedAddressJson)) _selectedAddress = JsonSerializer.Deserialize<AddressResponseData>(selectedAddressJson);
        }
        return _selectedAddress;
      }
      set {
        if (_selectedAddress != value) {
          _selectedAddress = value;
          if (_selectedAddress == null) Preferences.Default.Remove("selectedaddress");
          else {
            string selectedAddressJson = JsonSerializer.Serialize(_selectedAddress);
            Preferences.Default.Set("selectedaddress", selectedAddressJson);
            OnPropertyChanged();
          }
        }
      }
    }

    public List<string>? Following { get; private set; }
    public string? SelectedAddressName { get => SelectedAddress?.Address; }

    // data for selected address
    public List<Status>? CachedAddressStatuses { get; set; }
    public List<Pic>? CachedAddressPics { get; set; }
    public List<Paste>? CachedAddressPastes { get; set; }
    public MarkupString? CachedAddressBio { get; set; }
    private string? _cachedAddress;
    public string? CachedAddress {
      get => _cachedAddress;
      set {
        if (_cachedAddress != value) {
          _cachedAddress = value;
          CachedAddressStatuses = new List<Status>();
          CachedAddressPics = new List<Pic>();
          CachedAddressPastes = new List<Paste>();
          CachedAddressBio = null;
        }
      }
    }

    // share intent stuff
    private string? _shareString;
    public string? ShareString {
      get => _shareString;
      set {
        _shareString = value;
        OnIntentRecieved();
      }
    }
    public string? ShareStringSubject { get; set; }

    private string? _sharePhoto;
    public string? SharePhoto {
      get => _sharePhoto;
      set {
        _sharePhoto = value;
        OnIntentRecieved();
      }
    }
    public long? SharePhotoSize { get; set; }
    public string? SharePhotoContentType { get; set; }
    public string? SharePhotoText { get; set; }

    // refreshing
    private bool _isRefreshing;
    public bool IsRefreshing {
      get => _isRefreshing;
      private set {
        _isRefreshing = value;
        OnPropertyChanged();
      }
    }

    public void SendRefresh() => IsRefreshing = true;

    private static int _refresherCount = 0;
    private static Mutex mutex = new Mutex();

    public class RefreshToken : IDisposable {
      public event EventHandler? Disposed;
      public void Dispose() => Disposed?.Invoke(this, EventArgs.Empty);
    }
    public RefreshToken GetRefreshToken() {
      mutex.WaitOne();
      _refresherCount++;
      mutex.ReleaseMutex();
      RefreshToken token = new RefreshToken();
      token.Disposed += RefreshToken_Disposed;
      return token;
    }

    private void RefreshToken_Disposed(object? sender, EventArgs e) {
      mutex.WaitOne();
      _refresherCount--;
      if (_refresherCount == 0) IsRefreshing = false;
      mutex.ReleaseMutex();
    }

    private bool _canRefresh;
    public bool CanRefresh {
      get => _canRefresh;
      set {
        _canRefresh = value;
        OnPropertyChanged();
      }
    }

    // api service
    private ApiService api { get; set; }

    public State(ApiService restService) {
      api = restService;
    }

    public async Task PopulateAccountDetails(string token) {
      api.AddToken(token);

      string accountJson = Preferences.Default.Get("accountdetails", string.Empty);
      string addressJson = Preferences.Default.Get("accountaddresses", string.Empty);
      string selectedAddressJson = Preferences.Default.Get("selectedaddress", string.Empty);
      string followingJson = Preferences.Default.Get("following", string.Empty);

      if (!string.IsNullOrEmpty(accountJson)) AccountInfo = JsonSerializer.Deserialize<AccountResponseData>(accountJson);
      if (!string.IsNullOrEmpty(addressJson)) AddressList = JsonSerializer.Deserialize<AddressResponseList>(addressJson);
      if (!string.IsNullOrEmpty(selectedAddressJson)) SelectedAddress = JsonSerializer.Deserialize<AddressResponseData>(selectedAddressJson);
      if (!string.IsNullOrEmpty(followingJson)) Following = JsonSerializer.Deserialize<List<string>>(followingJson);

      // if we haven't got account info, attempt to retrieve it.
      if (AccountInfo == null) {
        AccountInfo = await api.AccountInfo();
        if (AccountInfo != null) {
          // quick fix for users without names (such as the review account)
          if(AccountInfo.Name == null) AccountInfo.Name = AccountInfo.Email.Split('@').FirstOrDefault() ?? "person";
          Preferences.Default.Set("accountdetails", JsonSerializer.Serialize(AccountInfo));
        }
      }

      // if we don't have the list of addresses, attempt to retrieve that.
      if (AddressList == null) {
        AddressList = await api.Addresses();
        if (AddressList != null) {
          Preferences.Default.Set("accountaddresses", JsonSerializer.Serialize(AddressList));
          SelectedAddress = AddressList.FirstOrDefault();
          Preferences.Default.Set("selectedaddress", JsonSerializer.Serialize(SelectedAddress));
        }
      }
    }

    public async Task RemoveAccountDetails() {
      await Task.Run(() => {
        Preferences.Default.Clear();
        AccountInfo = null;
        AddressList = null;
        SelectedAddress = null;
        Following = null;
        api.RemoveToken();
      });
    }

    public bool IsFollowing(string address) => Following?.Contains(address) ?? false;
    public async Task Follow(string address) {
      if (Following == null) Following = new List<string>();
      Following.Add(address);
      Preferences.Default.Set("following", JsonSerializer.Serialize(Following));
      await GetFeed(forceRefresh: true);
    }

    public async Task Unfollow(string address) {
      if (Following == null) Following = new List<string>();
      Following.Remove(address);
      Preferences.Default.Set("following", JsonSerializer.Serialize(Following));
      await GetFeed(forceRefresh: true);
    }

    public async Task<MarkupString?> GetBio(string address, bool forceRefresh = false) {
      CachedAddress = address;
      if (forceRefresh || CachedAddressBio == null) {
        CachedAddressBio = Utilities.MdToHtmlMarkup(await api.StatuslogBio(address));
      }
      return CachedAddressBio;
    }

    public async Task<List<MarkupString>?> GetEphemeralMessages(bool forceRefresh = false) {
      if (forceRefresh || this.EphemeralMessages == null || this.EphemeralMessages.Count == 0) {
        this.EphemeralMessages = await api.Ephemeral();
      }
      return this.EphemeralMessages;
    }

    public async Task<List<string>?> GetDirectory(bool forceRefresh = false) {
      if (forceRefresh || this.AddressDirectory == null || this.AddressDirectory.Count == 0) {
        IdnMapping idn = new IdnMapping();
        this.AddressDirectory = (await api.Directory())?.Select(s => {
          if (s.StartsWith("xn--")) return idn.GetUnicode(s);
          else return s;
        }).ToList();
      }
      return this.AddressDirectory;
    }

    public async Task<List<Status>?> GetStatuses(bool forceRefresh = false) {
      if (forceRefresh || this.Statuses == null || this.Statuses.Count == 0) {
        this.Statuses = await api.StatuslogLatest();
      }
      return this.Statuses;
    }

    public async Task<List<Status>?> GetStatuses(string address, bool forceRefresh = false) {
      this.CachedAddress = address;
      if (forceRefresh || this.CachedAddressStatuses == null || this.CachedAddressStatuses.Count == 0) {
        this.CachedAddressStatuses = await api.Statuslog(address);
      }
      return this.CachedAddressStatuses;
    }

    public async Task<List<NowData>?> GetNowGarden(bool forceRefresh = false) {
      if (forceRefresh || this.NowGarden == null || this.NowGarden.Count == 0) {
        this.NowGarden = await api.NowGarden();
      }
      return this.NowGarden;
    }

    public async Task<List<Pic>?> GetPics(bool forceRefresh = false) {
      if (forceRefresh || this.Pics == null || this.Pics.Count == 0) {
        this.Pics = await api.SomePics();
      }
      return this.Pics;
    }

    public async Task<List<Pic>?> GetPics(string address, bool forceRefresh = false) {
      CachedAddress = address;
      if (forceRefresh || this.CachedAddressPics == null || this.CachedAddressPics.Count == 0) {
        CachedAddressPics = (await api.SomePics(address)) ?? new List<Pic>();
      }
      return CachedAddressPics;
    }

    public async Task<List<Paste>?> GetPastes(string address, bool forceRefresh = false) {
      CachedAddress = address;
      if (forceRefresh || this.CachedAddressPastes == null || this.CachedAddressPastes.Count == 0) {
        if (AddressNames?.Contains(address) ?? false) {
          CachedAddressPastes = (await api.GetMyPastes(address)) ?? new List<Paste>();
        }
        else {
          CachedAddressPastes = (await api.GetPastes(address)) ?? new List<Paste>();
        }
      }
      return CachedAddressPastes;
    }

    public async Task RefreshStatuses() {
      await GetStatuses(forceRefresh: true);
      if(SelectedAddressName != null)
        await GetStatuses(SelectedAddressName, forceRefresh: true);
    }
    public async Task RefreshPics() {
      await GetPics(forceRefresh: true);
      if (SelectedAddressName != null)
        await GetPics(SelectedAddressName, forceRefresh: true );
    }
    public async Task RefreshNow() => await GetNowGarden(forceRefresh: true);

    public async Task RefreshPastes() {
      if (SelectedAddressName != null)
        await GetPastes(SelectedAddressName, forceRefresh: true);
    }

    public async Task<IOrderedEnumerable<FeedItem>> GetFeed(bool forceRefresh = false) {
      if(forceRefresh || Feed == null || Feed.Count == 0) {
        Feed = new List<FeedItem>();
        foreach(string address in Following ?? new List<string>()) {
          Feed.AddRange((await GetStatuses(address, forceRefresh))?.Select(s => new FeedItem { Status = s }) ?? new List<FeedItem>());
          Feed.AddRange((await GetPics(address, forceRefresh))?.Select(p => new FeedItem { Pic = p }) ?? new List<FeedItem>());
          Feed.AddRange((await GetPastes(address, forceRefresh))?.Select(p => new FeedItem { Paste = p }) ?? new List<FeedItem>());
        }
      }
      return Feed.OrderByDescending(s => s.CreatedTime);
    }

    public async Task<Dictionary<string, Theme>?> GetThemes(bool forceRefresh = false) {
      if (forceRefresh || this.Themes == null || this.Themes.Count == 0) {
        this.Themes = await api.GetThemes();
      }
      return this.Themes;
    }

  }
}