using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Pilz.Networking.CloudProviders.Nextcloud;
using Pilz.Networking.CloudProviders.Nextcloud.Model;
using Pilz.Networking.CloudProviders.Nextcloud.OCS;
using Pilz.Networking.CloudProviders.Nextcloud.OCS.Responses.LoginFlowV2;

namespace ConsoleApp9
{
    public class NextcloudClient : IDisposable
    {
        private readonly OcsApi ocs = new();

        public NextcloudLogin? CurrentLogin { get; private set; }

        public NextcloudClient()
        {
            ocs.GetOcsApiAuthCredentails += Ocs_GetOcsApiAuthCredentails;
        }

        private void Ocs_GetOcsApiAuthCredentails(object sender, GetOcsApiAuthCredentailsEventArgs eventArgs)
        {
            if (sender == ocs)
                eventArgs.Credentials = CurrentLogin.ToOcsApiAuthCredentials();
        }

        public async Task<UserInfo?> LoginAsync(NextcloudLogin login)
        {
            // Ensure we are logged out 
            await LogoutAsync();

            // Temporary set user login
            CurrentLogin = login;

            // Try get user info & check if user is enabled
            var userInfo = await GetUserInfoAsync();
            var isValid = userInfo != null && userInfo.Enabled;

            // If invalid, reset login credentials
            if (!isValid)
                CurrentLogin = null;

            return userInfo;
        }

        public async Task<NextcloudLogin?> LoginAsync(string baseUrl, CancellationToken cancellationToken)
        {
            // Ensure we are logged out
            await LogoutAsync();

            // Init the login process
            var initResponse = await ocs.LoginFlowV2.Init(baseUrl);

            if (!string.IsNullOrEmpty(initResponse?.LoginUrl) && initResponse.Poll != null)
            {
                // Open the browser
                Process.Start(new ProcessStartInfo
                {
                    FileName = initResponse.LoginUrl,
                    UseShellExecute = true
                });

                // Poll for credentails in intervals
                OcsResponseLoginFlowV2Credentials? pollResponse = null;
                while (!cancellationToken.IsCancellationRequested && pollResponse is null)
                {
                    // Wait 5 seconds
                    Thread.Sleep(5000);

                    // Poll the credentials
                    if (!cancellationToken.IsCancellationRequested)
                        pollResponse = await ocs.LoginFlowV2.Poll(initResponse.Poll);
                }

                // Check login credentials
                if (pollResponse is not null)
                    CurrentLogin = new(pollResponse);
            }

            return CurrentLogin;
        }

        public Task<UserInfo?> GetUserInfoAsync()
        {
            if (!string.IsNullOrEmpty(CurrentLogin?.LoginName))
                return GetUserInfoAsync(CurrentLogin.LoginName);
            else
                return Task.FromResult<UserInfo?>(null);
        }

        public async Task<UserInfo?> GetUserInfoAsync(string username)
        {
            var result = await ocs.Cloud.GetUserMeta(username);
            
            if (result?.Data != null)
                return new UserInfo(result.Data);

            return null;
        }

        public Task LogoutAsync()
        {
            return LogoutAsync(true);
        }

        public async Task LogoutAsync(bool logoutOnServer)
        {
            if (CurrentLogin != null)
            {
                // Delete currently used app password
                await ocs.Core.DeleteAppPassword();

                // Reset current login infos
                CurrentLogin = null;
            }
        }

        public void Dispose()
        {
            ocs.Dispose();
            GC.SuppressFinalize(this);
        }
    }
}