// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
//
//   http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.

define([
  'app',
  'api',
  'addons/fauxton/components',
  'addons/replication/resources'
],
function (app, FauxtonAPI, Components, Replication) {
  var View = {},
    Events = {},
    pollingInfo = {
      rate: 5,
      intervalId: null
    };

  _.extend(Events, Backbone.Events);

  // NOTES: http://wiki.apache.org/couchdb/Replication

  // Replication form view is huge
  // -----------------------------------
  // afterRender: autocomplete on the target input field
  // beforeRender:  add the status table
  // disableFields:  disable non active fields on submit
  // enableFields:  enable field when radio btns are clicked
  // establish:  get the DB list for autocomplete
  // formValidation:  make sure fields aren't empty
  // showProgress:  make a call to active_tasks model and show only replication types.  Poll every 5 seconds. (make this it's own view)
  // startReplication:  saves to the model, starts replication
  // submit:  form submit handler
  // swapFields:  change to and from target
  // toggleAdvancedOptions:  toggle advanced

  View.ReplicationFormForAdmins = FauxtonAPI.View.extend({
    template: 'addons/replication/templates/form',
    events:  {
      'submit #replication': 'validate',
      'click .btn-group .btn': 'showFields',
      'click .swap': 'swapFields',
      'click .options': 'toggleAdvancedOptions'
    },

    initialize: function (options) {
      this.status = options.status;
      this.selectedDB = options.selectedDB;
      this.newRepModel = new Replication.Replicate({});
    },

    afterRender: function () {
      this.dbSearchTypeahead = new Components.DbSearchTypeahead({
        dbLimit: 30,
        el: 'input#to_name'
      });

      this.dbSearchTypeahead.render();
    },

    beforeRender: function () {
      this.insertView('#replicationStatus', new View.ReplicationListForAdmins({
        collection: this.status
      }));
    },

    cleanup: function () {
      clearInterval(pollingInfo.intervalId);
    },

    enableFields: function () {
      this.$el.find('input', 'select').attr('disabled', false);
    },

    disableFields: function () {
      this.$el.find('input:hidden', 'select:hidden').attr('disabled', true);
    },

    showFields: function (e) {
      var $currentTarget = this.$(e.currentTarget),
      targetVal = $currentTarget.val();

      if (targetVal === 'local') {
        $currentTarget.parents('.form_set').addClass('local');
        return;
      }

      $currentTarget.parents('.form_set').removeClass('local');
    },

    establish: function () {
      return [this.collection.fetch(), this.status.fetch()];
    },

    validate: function (e) {
      e.preventDefault();
      if (this.formValidation()) {
        FauxtonAPI.addNotification({
          msg: 'Please enter every field.',
          type: 'error',
          clear: true
        });
        return;

      } else if (this.$('input#to_name').is(':visible') && !this.$('input[name=create_target]').is(':checked')) {
        var alreadyExists = this.collection.where({
          "name": this.$('input#to_name').val()
        });
        if (alreadyExists.length === 0) {
          FauxtonAPI.addNotification({
            msg: 'This database doesn\'t exist. Check create target if you want to create it.',
            type: 'error',
            clear: true
          });
          return;
        }
      }

      this.submit(e);
    },

    formValidation: function () {
      var $remote = this.$el.find('input:visible'),
          error = false;
      _.each($remote, function (item) {
        if (item.value === 'http://' || item.value === '') {
          error = true;
        }
      });
      return error;
    },

    serialize: function () {
      return {
        databases:  this.collection.toJSON(),
        selectedDB: this.selectedDB
      };
    },

    startReplication: function (json) {
      var that = this;
      this.newRepModel.save(json, {
        success: function (resp) {
          FauxtonAPI.addNotification({
            msg: 'Replication from ' + resp.get('source') + ' to ' + resp.get('target') + ' has begun.',
            type: 'success',
            clear: true
          });
          that.updateButtonText(false);
          Events.trigger('update:tasks');
        },
        error: function (model, xhr, options) {
          var errorMessage = JSON.parse(xhr.responseText);
          FauxtonAPI.addNotification({
            msg: errorMessage.reason,
            type: 'error',
            clear: true
          });
          that.updateButtonText(false);
        }
      });
      this.enableFields();
    },

    updateButtonText: function (wait) {
      var $button = this.$('#replication button[type=submit]');
      if (wait) {
        $button.text('Starting replication...').attr('disabled', true);
      } else {
        $button.text('Replication').attr('disabled', false);
      }
    },

    submit: function (e) {
      this.disableFields();
      var formJSON = {};
      _.map(this.$(e.currentTarget).serializeArray(), function (formData) {
        if (formData.value !== '') {
          formJSON[formData.name] = (formData.value === "true" ? true : formData.value.replace(/\s/g, '').toLowerCase());
        }
      });

      this.updateButtonText(true);
      this.startReplication(formJSON);
    },

    swapFields: function (e) {
      // WALL O' VARIABLES
      var $fromSelect = this.$('#from_name'),
          $toSelect = this.$('#to_name'),
          $toInput = this.$('#to_url'),
          $fromInput = this.$('#from_url'),
          fromSelectVal = $fromSelect.val(),
          fromInputVal = $fromInput.val(),
          toSelectVal = $toSelect.val(),
          toInputVal = $toInput.val();

      $fromSelect.val(toSelectVal);
      $toSelect.val(fromSelectVal);

      $fromInput.val(toInputVal);
      $toInput.val(fromInputVal);

      // prevent other click handlers from running
      return false;
    }
  });

  View.ReplicationForm = View.ReplicationFormForAdmins.extend({
    template: 'addons/replication/templates/form',

    events: {
      'submit #replication': 'validate',
      'click .btn-group .btn': 'showFields',
      'click .swap': 'swapFields',
      'click .options': 'toggleAdvancedOptions'
    },

    initialize: function (options) {
      this.selectedDB = options.selectedDB;
      this.newRepModel = new Replication.Replicate({});
    },

    beforeRender: function () {},

    establish: function () {
      return [this.collection.fetch()];
    }
  });

  View.ReplicationListForAdmins = FauxtonAPI.View.extend({
    tagName: 'ul',

    initialize: function () {
      Events.bind('update:tasks', this.establish, this);
      this.listenTo(this.collection, 'reset', this.render);
      this.$el.prepend('<li class="header"><h4>Active Replication Tasks</h4></li>');
    },

    establish: function () {
      return [this.collection.fetch({ reset: true })];
    },

    setPolling: function () {
      var that = this;
      this.cleanup();
      pollingInfo.intervalId = setInterval(function () {
        that.establish();
      }, pollingInfo.rate * 1000);
    },

    cleanup: function () {
      Events.unbind('update:tasks');
      clearInterval(pollingInfo.intervalId);
    },

    beforeRender: function () {
      this.collection.forEach(function (item) {
        this.insertView(new View.replicationItem({
          model: item
        }));
      }, this);
    },

    showHeader: function () {
      this.$el.parent()
        .toggleClass('showHeader', this.collection.length > 0);
    },

    afterRender: function () {
      this.showHeader();
      this.setPolling();
    }
  });

  //make this a table row item.
  View.replicationItem = FauxtonAPI.View.extend({
    tagName: 'li',
    className: 'row',
    template: 'addons/replication/templates/progress',
    events: {
      'click .cancel': 'cancelReplication'
    },

    initialize: function () {
      this.newRepModel = new Replication.Replicate({});
    },

    establish: function () {
      return [this.model.fetch()];
    },

    cancelReplication: function (e) {
      // need to pass "cancel": true with source & target
      var $currentTarget = this.$(e.currentTarget),
          repID = $currentTarget.attr('data-rep-id');

      this.newRepModel.save({
        "replication_id": repID,
        "cancel": true
      },
      {
        success: function (model, xhr, options) {
          FauxtonAPI.addNotification({
            msg: 'Replication stopped.',
            type: 'success',
            clear: true
          });
        },
        error: function (model, xhr, options) {
          var errorMessage = JSON.parse(xhr.responseText);
          FauxtonAPI.addNotification({
            msg: errorMessage.reason,
            type: 'error',
            clear: true
          });
        }
      });
    },

    afterRender: function () {
      if (this.model.get('continuous')) {
        this.$el.addClass('continuous');
      }
    },

    serialize: function () {
      return {
        progress:  this.model.get('progress'),
        target: this.model.get('target'),
        source: this.model.get('source'),
        continuous: this.model.get('continuous'),
        repid: this.model.get('replication_id')
      };
    }
  });

  return View;
});