import moment from 'moment';

angular.module('portainer.app').factory('StateManager', StateManagerFactory);

/* @ngInject */
function StateManagerFactory($async, $q, SystemService, InfoHelper, LocalStorage, SettingsService, StatusService, APPLICATION_CACHE_VALIDITY, AgentPingService, EndpointProvider) {
  var manager = {};

  var state = {
    loading: true,
    application: {},
    endpoint: {},
    UI: {
      dismissedInfoPanels: {},
      dismissedInfoHash: '',
      timesPasswordChangeSkipped: {},
      dismissedUpdateVersion: '',
    },
  };

  manager.dismissInformationPanel = function (id) {
    state.UI.dismissedInfoPanels[id] = true;
    LocalStorage.storeUIState(state.UI);
  };

  manager.dismissImportantInformation = function (hash) {
    state.UI.dismissedInfoHash = hash;
    LocalStorage.storeUIState(state.UI);
  };

  manager.setRequiredPasswordLength = function (length) {
    state.UI.requiredPasswordLength = length;
    LocalStorage.storeUIState(state.UI);
  };

  manager.setPasswordChangeSkipped = function (userID) {
    state.UI.instanceId = state.UI.instanceId || state.application.instanceId;
    state.UI.timesPasswordChangeSkipped[userID] = state.UI.timesPasswordChangeSkipped[userID] + 1 || 1;
    LocalStorage.storeUIState(state.UI);
  };

  manager.resetPasswordChangeSkips = function (userID) {
    if (!state.UI.timesPasswordChangeSkipped) {
      return;
    }
    if (state.UI.timesPasswordChangeSkipped[userID]) state.UI.timesPasswordChangeSkipped[userID] = 0;
    LocalStorage.storeUIState(state.UI);
  };

  manager.clearPasswordChangeSkips = function () {
    state.UI.timesPasswordChangeSkipped = {};
    LocalStorage.storeUIState(state.UI);
  };

  manager.getState = function () {
    return state;
  };

  manager.clean = function () {
    manager.cleanEndpoint();
    state.application = {};
  };

  manager.cleanEndpoint = function () {
    state.endpoint = {};
    EndpointProvider.clean();
    LocalStorage.cleanEndpointState();
  };

  manager.updateLogo = function (logoURL) {
    state.application.logo = logoURL;
    LocalStorage.storeApplicationState(state.application);
  };

  manager.updateSnapshotInterval = function (interval) {
    state.application.snapshotInterval = interval;
    LocalStorage.storeApplicationState(state.application);
  };

  manager.updateEnableEdgeComputeFeatures = function updateEnableEdgeComputeFeatures(enableEdgeComputeFeatures) {
    state.application.enableEdgeComputeFeatures = enableEdgeComputeFeatures;
    LocalStorage.storeApplicationState(state.application);
  };

  function assignStateFromStatusAndSettings(status, settings) {
    state.application.version = status.Version;
    state.application.edition = status.Edition;
    state.application.instanceId = status.InstanceID;

    state.application.logo = settings.LogoURL;
    state.application.snapshotInterval = settings.SnapshotInterval;
    state.application.enableEdgeComputeFeatures = settings.EnableEdgeComputeFeatures;
    state.application.validity = moment().unix();
  }

  function loadApplicationState() {
    var deferred = $q.defer();

    $q.all({
      settings: SettingsService.publicSettings(),
      status: StatusService.status(),
    })
      .then(function success(data) {
        var status = data.status;
        var settings = data.settings;
        assignStateFromStatusAndSettings(status, settings);
        LocalStorage.storeApplicationState(state.application);
        deferred.resolve(state);
      })
      .catch(function error(err) {
        deferred.reject({ msg: 'Unable to retrieve server settings and status', err: err });
      });

    return deferred.promise;
  }

  manager.initialize = initialize;
  async function initialize() {
    return $async(async () => {
      const endpointState = LocalStorage.getEndpointState();
      if (endpointState) {
        state.endpoint = endpointState;
      }

      const applicationState = LocalStorage.getApplicationState();
      if (isAppStateValid(applicationState)) {
        state.application = applicationState;
      } else {
        await loadApplicationState();
      }

      const UIState = LocalStorage.getUIState();
      if (UIState) {
        state.UI = UIState;
        if (state.UI.instanceId && state.UI.instanceId !== state.application.instanceId) {
          state.UI.instanceId = state.application.instanceId;
          state.UI.timesPasswordChangeSkipped = {};
          LocalStorage.storeUIState(state.UI);
        }
      }

      state.loading = false;
      return state;
    });
  }

  function isAppStateValid(appState) {
    if (!appState || !appState.validity) {
      return false;
    }
    const now = moment().unix();
    const cacheValidity = now - appState.validity;
    return cacheValidity < APPLICATION_CACHE_VALIDITY;
  }

  manager.updateEndpointState = function (endpoint) {
    var deferred = $q.defer();

    if (endpoint.Type === 3) {
      state.endpoint.name = endpoint.Name;
      state.endpoint.mode = { provider: 'AZURE' };
      LocalStorage.storeEndpointState(state.endpoint);
      deferred.resolve();
      return deferred.promise;
    } else if (endpoint.Type === 5 || endpoint.Type === 6 || endpoint.Type === 7) {
      state.endpoint.name = endpoint.Name;
      state.endpoint.mode = { provider: 'KUBERNETES' };
      LocalStorage.storeEndpointState(state.endpoint);
      deferred.resolve();
      return deferred.promise;
    }

    $q.all({
      version: SystemService.version(),
      info: SystemService.info(),
    })
      .then(function success(data) {
        var endpointMode = InfoHelper.determineEndpointMode(data.info, endpoint.Type);
        var endpointAPIVersion = parseFloat(data.version.ApiVersion);
        state.endpoint.mode = endpointMode;
        state.endpoint.name = endpoint.Name;
        state.endpoint.type = endpoint.Type;
        state.endpoint.apiVersion = endpointAPIVersion;

        if (endpointMode.agentProxy && endpoint.Status === 1) {
          return AgentPingService.ping(endpoint.Id).then(function onPingSuccess(data) {
            state.endpoint.agentApiVersion = data.version;
          });
        }
      })
      .then(function () {
        LocalStorage.storeEndpointState(state.endpoint);
        deferred.resolve();
      })
      .catch(function error(err) {
        deferred.reject({ msg: 'Unable to connect to the Docker environment', err: err });
      })
      .finally(function final() {
        state.loading = false;
      });

    return deferred.promise;
  };

  manager.getAgentApiVersion = function getAgentApiVersion() {
    return state.endpoint.agentApiVersion;
  };

  return manager;
}