using Bit.App.Abstractions;
using Bit.App.Resources;
using Bit.Core;
using Bit.Core.Abstractions;
using Bit.Core.Utilities;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace Bit.App.Pages
{
    public class SettingsPageViewModel : BaseViewModel
    {
        private readonly IPlatformUtilsService _platformUtilsService;
        private readonly ICryptoService _cryptoService;
        private readonly IUserService _userService;
        private readonly IDeviceActionService _deviceActionService;
        private readonly IEnvironmentService _environmentService;
        private readonly IMessagingService _messagingService;
        private readonly ILockService _lockService;
        private readonly IStorageService _storageService;
        private readonly ISyncService _syncService;

        private string _fingerprintName;
        private bool _supportsFingerprint;
        private bool _pin;
        private bool _fingerprint;
        private string _lastSyncDate;
        private string _lockOptionValue;
        private List<KeyValuePair<string, int?>> _lockOptions =
            new List<KeyValuePair<string, int?>>
            {
                new KeyValuePair<string, int?>(AppResources.LockOptionImmediately, 0),
                new KeyValuePair<string, int?>(AppResources.LockOption1Minute, 1),
                new KeyValuePair<string, int?>(AppResources.LockOption5Minutes, 5),
                new KeyValuePair<string, int?>(AppResources.LockOption15Minutes, 15),
                new KeyValuePair<string, int?>(AppResources.LockOption30Minutes, 30),
                new KeyValuePair<string, int?>(AppResources.LockOption1Hour, 60),
                new KeyValuePair<string, int?>(AppResources.LockOption4Hours, 240),
                new KeyValuePair<string, int?>(AppResources.Never, null),
            };

        public SettingsPageViewModel()
        {
            _platformUtilsService = ServiceContainer.Resolve<IPlatformUtilsService>("platformUtilsService");
            _cryptoService = ServiceContainer.Resolve<ICryptoService>("cryptoService");
            _userService = ServiceContainer.Resolve<IUserService>("userService");
            _deviceActionService = ServiceContainer.Resolve<IDeviceActionService>("deviceActionService");
            _environmentService = ServiceContainer.Resolve<IEnvironmentService>("environmentService");
            _messagingService = ServiceContainer.Resolve<IMessagingService>("messagingService");
            _lockService = ServiceContainer.Resolve<ILockService>("lockService");
            _storageService = ServiceContainer.Resolve<IStorageService>("storageService");
            _syncService = ServiceContainer.Resolve<ISyncService>("syncService");

            GroupedItems = new ExtendedObservableCollection<SettingsPageListGroup>();
            PageTitle = AppResources.Settings;

            _fingerprintName = AppResources.Fingerprint;
            if(Device.RuntimePlatform == Device.iOS)
            {
                _fingerprintName = AppResources.TouchID;
                // TODO: face id
            }
        }

        public ExtendedObservableCollection<SettingsPageListGroup> GroupedItems { get; set; }

        public async Task InitAsync()
        {
            _supportsFingerprint = await _platformUtilsService.SupportsFingerprintAsync();
            var lastSync = await _syncService.GetLastSyncAsync();
            if(lastSync != null)
            {
                _lastSyncDate = string.Format("{0} {1}", lastSync.Value.ToShortDateString(),
                    lastSync.Value.ToShortTimeString());
            }
            var option = await _storageService.GetAsync<int?>(Constants.LockOptionKey);
            _lockOptionValue = _lockOptions.FirstOrDefault(o => o.Value == option).Key;
            var pinSet = await _lockService.IsPinLockSetAsync();
            _pin = pinSet.Item1 || pinSet.Item2;
            _fingerprint = await _lockService.IsFingerprintLockSetAsync();
            BuildList();
        }

        public async Task AboutAsync()
        {
            var debugText = string.Format("{0}: {1} ({2})", AppResources.Version,
                _platformUtilsService.GetApplicationVersion(), _deviceActionService.GetBuildNumber());
            var text = string.Format("© 8bit Solutions LLC 2015-{0}\n\n{1}", DateTime.Now.Year, debugText);
            var copy = await _platformUtilsService.ShowDialogAsync(text, AppResources.Bitwarden, AppResources.Copy,
                AppResources.Close);
            if(copy)
            {
                await _platformUtilsService.CopyToClipboardAsync(debugText);
            }
        }

        public void Help()
        {
            _platformUtilsService.LaunchUri("https://help.bitwarden.com/");
        }

        public async Task FingerprintAsync()
        {
            var fingerprint = await _cryptoService.GetFingerprintAsync(await _userService.GetUserIdAsync());
            var phrase = string.Join("-", fingerprint);
            var text = string.Format("{0}:\n\n{1}", AppResources.YourAccountsFingerprint, phrase);
            var learnMore = await _platformUtilsService.ShowDialogAsync(text, AppResources.FingerprintPhrase,
                AppResources.LearnMore, AppResources.Close);
            if(learnMore)
            {
                _platformUtilsService.LaunchUri("https://help.bitwarden.com/article/fingerprint-phrase/");
            }
        }

        public void Rate()
        {
            _deviceActionService.RateApp();
        }

        public void Import()
        {
            _platformUtilsService.LaunchUri("https://help.bitwarden.com/article/import-data/");
        }

        public void Export()
        {
            _platformUtilsService.LaunchUri("https://help.bitwarden.com/article/export-your-data/");
        }

        public void WebVault()
        {
            var url = _environmentService.GetWebVaultUrl();
            if(url == null)
            {
                url = "https://vault.bitwarden.com";
            }
            _platformUtilsService.LaunchUri(url);
        }

        public async Task ShareAsync()
        {
            var confirmed = await _platformUtilsService.ShowDialogAsync(AppResources.ShareVaultConfirmation,
                AppResources.ShareVault, AppResources.Yes, AppResources.Cancel);
            if(confirmed)
            {
                _platformUtilsService.LaunchUri("https://help.bitwarden.com/article/what-is-an-organization/");
            }
        }

        public async Task TwoStepAsync()
        {
            var confirmed = await _platformUtilsService.ShowDialogAsync(AppResources.TwoStepLoginConfirmation,
                AppResources.TwoStepLogin, AppResources.Yes, AppResources.Cancel);
            if(confirmed)
            {
                _platformUtilsService.LaunchUri("https://help.bitwarden.com/article/setup-two-step-login/");
            }
        }

        public async Task ChangePasswordAsync()
        {
            var confirmed = await _platformUtilsService.ShowDialogAsync(AppResources.ChangePasswordConfirmation,
                AppResources.ChangeMasterPassword, AppResources.Yes, AppResources.Cancel);
            if(confirmed)
            {
                _platformUtilsService.LaunchUri("https://help.bitwarden.com/article/change-your-master-password/");
            }
        }

        public async Task LogOutAsync()
        {
            var confirmed = await _platformUtilsService.ShowDialogAsync(AppResources.LogoutConfirmation,
                AppResources.LogOut, AppResources.Yes, AppResources.Cancel);
            if(confirmed)
            {
                _messagingService.Send("logout");
            }
        }

        public async Task LockAsync()
        {
            await _lockService.LockAsync(true, true);
        }

        public async Task LockOptionsAsync()
        {
            var options = _lockOptions.Select(o => o.Key == _lockOptionValue ? $"✓ {o.Key}" : o.Key).ToArray();
            var selection = await Page.DisplayActionSheet(AppResources.LockOptions, AppResources.Cancel, null, options);
            if(selection == null || selection == AppResources.Cancel)
            {
                return;
            }
            var cleanSelection = selection.Replace("✓ ", string.Empty);
            var selectionOption = _lockOptions.FirstOrDefault(o => o.Key == cleanSelection);
            _lockOptionValue = selectionOption.Key;
            await _lockService.SetLockOptionAsync(selectionOption.Value);
            BuildList();
        }

        public async Task UpdatePinAsync()
        {
            _pin = !_pin;
            if(_pin)
            {
                var pin = await _deviceActionService.DisplayPromptAync(AppResources.EnterPIN,
                    AppResources.SetPINDescription, null, AppResources.Submit, AppResources.Cancel, true);
                if(!string.IsNullOrWhiteSpace(pin))
                {
                    var masterPassOnRestart = await _platformUtilsService.ShowDialogAsync(
                       AppResources.PINRequireMasterPasswordRestart, AppResources.UnlockWithPIN,
                       AppResources.Yes, AppResources.No);
                    if(masterPassOnRestart)
                    {
                        var encPin = await _cryptoService.EncryptAsync(pin);
                        await _storageService.SaveAsync(Constants.ProtectedPin, encPin.EncryptedString);
                    }
                    else
                    {
                        var kdf = await _userService.GetKdfAsync();
                        var kdfIterations = await _userService.GetKdfIterationsAsync();
                        var email = await _userService.GetEmailAsync();
                        var pinKey = await _cryptoService.MakePinKeyAysnc(pin, email,
                            kdf.GetValueOrDefault(Core.Enums.KdfType.PBKDF2_SHA256),
                            kdfIterations.GetValueOrDefault(5000));
                        var key = await _cryptoService.GetKeyAsync();
                        var pinProtectedKey = await _cryptoService.EncryptAsync(key.Key, pinKey);
                        await _storageService.SaveAsync(Constants.PinProtectedKey, pinProtectedKey.EncryptedString);
                    }
                }
                else
                {
                    _pin = false;
                }
            }
            if(!_pin)
            {
                await _storageService.RemoveAsync(Constants.PinProtectedKey);
                await _storageService.RemoveAsync(Constants.ProtectedPin);
            }
            BuildList();
        }

        public async Task UpdateFingerprintAsync()
        {
            var current = _fingerprint;
            if(_fingerprint)
            {
                _fingerprint = false;
            }
            else if(await _platformUtilsService.SupportsFingerprintAsync())
            {
                _fingerprint = await _platformUtilsService.AuthenticateFingerprintAsync();
            }
            if(_fingerprint == current)
            {
                return;
            }
            if(_fingerprint)
            {
                await _storageService.SaveAsync(Constants.FingerprintUnlockKey, true);
            }
            else
            {
                await _storageService.RemoveAsync(Constants.FingerprintUnlockKey);
            }
            await _cryptoService.ToggleKeyAsync();
            BuildList();
        }

        private void BuildList()
        {
            var doUpper = Device.RuntimePlatform != Device.Android;
            var autofillItems = new List<SettingsPageListItem>();
            if(Device.RuntimePlatform == Device.Android)
            {
                if(_deviceActionService.SupportsAutofillService())
                {
                    autofillItems.Add(new SettingsPageListItem
                    {
                        Name = AppResources.AutofillService,
                        SubLabel = _deviceActionService.AutofillServiceEnabled() ?
                            AppResources.Enabled : AppResources.Disabled
                    });
                }
                autofillItems.Add(new SettingsPageListItem
                {
                    Name = AppResources.AutofillAccessibilityService,
                    SubLabel = _deviceActionService.AutofillAccessibilityServiceRunning() ?
                        AppResources.Enabled : AppResources.Disabled
                });
            }
            else
            {
                if(_deviceActionService.SystemMajorVersion() >= 12)
                {
                    autofillItems.Add(new SettingsPageListItem { Name = AppResources.PasswordAutofill });
                }
                autofillItems.Add(new SettingsPageListItem { Name = AppResources.AppExtension });
            }
            var manageItems = new List<SettingsPageListItem>
            {
                new SettingsPageListItem { Name = AppResources.Folders },
                new SettingsPageListItem { Name = AppResources.Sync, SubLabel = _lastSyncDate }
            };
            var securityItems = new List<SettingsPageListItem>
            {
                new SettingsPageListItem { Name = AppResources.LockOptions, SubLabel = _lockOptionValue },
                new SettingsPageListItem
                {
                    Name = AppResources.UnlockWithPIN,
                    SubLabel = _pin ? AppResources.Enabled : AppResources.Disabled
                },
                new SettingsPageListItem { Name = AppResources.LockNow },
                new SettingsPageListItem { Name = AppResources.TwoStepLogin }
            };
            if(_supportsFingerprint)
            {
                var item = new SettingsPageListItem
                {
                    Name = string.Format(AppResources.UnlockWith, _fingerprintName),
                    SubLabel = _fingerprint ? AppResources.Enabled : AppResources.Disabled
                };
                securityItems.Insert(1, item);
            }
            var accountItems = new List<SettingsPageListItem>
            {
                new SettingsPageListItem { Name = AppResources.ChangeMasterPassword },
                new SettingsPageListItem { Name = AppResources.FingerprintPhrase },
                new SettingsPageListItem { Name = AppResources.LogOut }
            };
            var toolsItems = new List<SettingsPageListItem>
            {
                new SettingsPageListItem { Name = AppResources.ImportItems },
                new SettingsPageListItem { Name = AppResources.ExportVault },
                new SettingsPageListItem { Name = AppResources.ShareVault },
                new SettingsPageListItem { Name = AppResources.WebVault }
            };
            var otherItems = new List<SettingsPageListItem>
            {
                new SettingsPageListItem { Name = AppResources.Options },
                new SettingsPageListItem { Name = AppResources.About },
                new SettingsPageListItem { Name = AppResources.HelpAndFeedback },
                new SettingsPageListItem { Name = AppResources.RateTheApp }
            };
            GroupedItems.ResetWithRange(new List<SettingsPageListGroup>
            {
                new SettingsPageListGroup(autofillItems, AppResources.Autofill, doUpper, true),
                new SettingsPageListGroup(manageItems, AppResources.Manage, doUpper),
                new SettingsPageListGroup(securityItems, AppResources.Security, doUpper),
                new SettingsPageListGroup(accountItems, AppResources.Account, doUpper),
                new SettingsPageListGroup(toolsItems, AppResources.Tools, doUpper),
                new SettingsPageListGroup(otherItems, AppResources.Other, doUpper)
            });
        }
    }
}