/*jshint globalstrict:true */
/*global angular:true */
'use strict';

angular.module('kibana.services', [])
.service('eventBus', function($rootScope) {

  // An array of registed types
  var _types = []

  this.broadcast = function(from,to,type,data) {
    if(_.isUndefined(data))
      var data = from

    var packet = {
      time: new Date(),
      type: type,
      from: from,
      to: to,
      data: data
    }

    if(_.contains(_types,'$kibana_debug'))
      $rootScope.$broadcast('$kibana_debug',packet);

    //console.log('Sent: '+type + ' to ' + to + ' from ' + from + ': ' + angular.toJson(data))
    $rootScope.$broadcast(type,{
      from: from,
      to: to,
      data: data
    });
  }

  // This sets up an $on listener that checks to see if the event (packet) is
  // addressed to the scope in question and runs the registered function if it
  // is.
  this.register = function(scope,type,fn) {

    _types = _.union(_types,[type])

    scope.$on(type,function(event,packet){
      var _id     = scope.$id;
      var _to     = packet.to;
      var _from   = packet.from;
      var _type   = packet.type
      var _time   = packet.time
      var _group  = (!(_.isUndefined(scope.panel))) ? scope.panel.group : ["NONE"] 

      //console.log('registered:' + type + " for " + scope.panel.title + " " + scope.$id)
      if(!(_.isArray(_to)))
        _to = [_to];
      if(!(_.isArray(_group)))
        _group = [_group];
      
      // Transmit event only if the sender is not the receiver AND one of the following:
      // 1) Receiver has group in _to 2) Receiver's $id is in _to
      // 3) Event is addressed to ALL 4) Receiver is in ALL group 
      if((_.intersection(_to,_group).length > 0 || 
        _.indexOf(_to,_id) > -1 ||
        _.indexOf(_group,'ALL') > -1 ||
        _.indexOf(_to,'ALL') > -1) &&
        _from !== _id
      ) {
        //console.log('Got: '+type + ' from ' + _from + ' to ' + _to + ': ' + angular.toJson(packet.data))
        fn(event,packet.data,{time:_time,to:_to,from:_from,type:_type});
      }
    });
  }
})
/* 
  Service: fields
  Provides a global list of all seen fields for use in editor panels
*/
.factory('fields', function($rootScope) {
  var fields = {
    list : []
  }

  $rootScope.$on('fields', function(event,f) {
    fields.list = _.union(f.data.all,fields.list)
  })

  return fields;

})
.service('kbnIndex',function($http) {
  // returns a promise containing an array of all indices matching the index
  // pattern that exist in a given range
  this.indices = function(from,to,pattern,interval) {
    var possible = [];
    _.each(expand_range(fake_utc(from),fake_utc(to),interval),function(d){
      possible.push(d.format(pattern));
    });

    return all_indices().then(function(p) {
      var indices = _.intersection(possible,p);
      indices.reverse();
      return indices
    })
  };

  // returns a promise containing an array of all indices in an elasticsearch
  // cluster
  function all_indices() {
    var something = $http({
      url: config.elasticsearch + "/_aliases",
      method: "GET"
    }).error(function(data, status, headers, config) {
      // Handle error condition somehow?
    });

    return something.then(function(p) {
      var indices = [];
      _.each(p.data, function(v,k) {
        indices.push(k)
      });
      return indices;
    });
  }

  // this is stupid, but there is otherwise no good way to ensure that when
  // I extract the date from an object that I get the UTC date. Stupid js.
  // I die a little inside every time I call this function.
  // Update: I just read this again. I died a little more inside.
  // Update2: More death.
  function fake_utc(date) {
    date = moment(date).clone().toDate()
    return moment(new Date(date.getTime() + date.getTimezoneOffset() * 60000));
  }

  // Create an array of date objects by a given interval
  function expand_range(start, end, interval) {
    if(_.contains(['hour','day','week','month','year'],interval)) {
      var range;
      start = moment(start).clone();
      range = [];
      while (start.isBefore(end)) {
        range.push(start.clone());
        switch (interval) {
        case 'hour':
          start.add('hours',1)
          break
        case 'day':
          start.add('days',1)
          break
        case 'week':
          start.add('weeks',1)
          break
        case 'month':
          start.add('months',1)
          break
        case 'year':
          start.add('years',1)
          break
        }
      }
      range.push(moment(end).clone());
      return range;
    } else {
      return false;
    }
  }
})

.service('timer', function($timeout) {
  // This service really just tracks a list of $timeout promises to give us a
  // method for cancelling them all when we need to

  var timers = [];

  this.register = function(promise) {
    timers.push(promise);
    return promise;
  }

  this.cancel = function(promise) {
    timers = _.without(timers,promise)
    $timeout.cancel(promise)
  }

  this.cancel_all = function() {
    _.each(timers, function(t){
      $timeout.cancel(t);
    });
    timers = new Array();
  }

})
.service('query', function() {

})
.service('dashboard', function($routeParams, $http, $rootScope, ejsResource, timer) {
  // A hash of defaults to use when loading a dashboard

  var _dash = {
    title: "",
    editable: true,
    rows: [],
    services: {}
  };

  // An elasticJS client to use
  var ejs = ejsResource(config.elasticsearch);  
  var gist_pattern = /(^\d{5,}$)|(^[a-z0-9]{10,}$)|(gist.github.com(\/*.*)\/[a-z0-9]{5,}\/*$)/;

  // Empty dashboard object
  this.current = {};
  this.last = {};

  // Store a reference to this
  var self = this;

  $rootScope.$on('$routeChangeSuccess',function(){
    route();
  })

  var route = function() {
    // Is there a dashboard type and id in the URL?
    if(!(_.isUndefined($routeParams.type)) && !(_.isUndefined($routeParams.id))) {
      var _type = $routeParams.type;
      var _id = $routeParams.id;

      if(_type === 'elasticsearch')
        self.elasticsearch_load('dashboard',_id)
      if(_type === 'temp')
        self.elasticsearch_load('temp',_id)
      if(_type === 'file')
        self.file_load(_id)

    // No dashboard in the URL
    } else {
      // Check if browser supports localstorage, and if there's a dashboard 
      if (Modernizr.localstorage && 
        !(_.isUndefined(localStorage['dashboard'])) &&
        localStorage['dashboard'] !== ''
      ) {
        var dashboard = JSON.parse(localStorage['dashboard']);
        _.defaults(dashboard,_dash);
        self.dash_load(dashboard)
      // No? Ok, grab default.json, its all we have now
      } else {
        self.file_load('default')
      } 
    }
  }

  this.to_file = function() {
    var blob = new Blob([angular.toJson(self.current,true)], {type: "application/json;charset=utf-8"});
    // from filesaver.js
    saveAs(blob, self.current.title+"-"+new Date().getTime());
    return true;
  }

  this.set_default = function(dashboard) {
    if (Modernizr.localstorage) {
      localStorage['dashboard'] = angular.toJson(dashboard || self.current);
      return true;
    } else {
      return false;
    }  
  }

  this.purge_default = function() {
    if (Modernizr.localstorage) {
      localStorage['dashboard'] = '';
      return true;
    } else {
      return false;
    }
  }

  // TOFIX: Pretty sure this breaks when you're on a saved dashboard already
  this.share_link = function(title,type,id) {
    return {
      location  : location.href.replace(location.hash,""),
      type      : type,
      id        : id,
      link      : location.href.replace(location.hash,"")+"#dashboard/"+type+"/"+id,
      title     : title
    };
  }

  this.file_load = function(file) {
    return $http({
      url: "dashboards/"+file,
      method: "GET",
    }).then(function(result) {
      var _dashboard = result.data
      _.defaults(_dashboard,_dash);
      self.dash_load(_dashboard);
      return true;
    },function(result) {
      return false;
    });
  }

  this.elasticsearch_load = function(type,id) {
    var request = ejs.Request().indices(config.kibana_index).types(type);
    var results = request.query(
      ejs.IdsQuery(id)
    ).doSearch();
    return results.then(function(results) {
      if(_.isUndefined(results)) {
        return false;
      } else {
        self.dash_load(angular.fromJson(results.hits.hits[0]['_source']['dashboard']))
        return true;
      }
    });
  }

  this.elasticsearch_save = function(type,title,ttl) {
    // Clone object so we can modify it without influencing the existing obejct
    var save = _.clone(self.current)

    // Change title on object clone
    if (type === 'dashboard') {
      var id = save.title = _.isUndefined(title) ? self.current.title : title;
    }

    // Create request with id as title. Rethink this.
    var request = ejs.Document(config.kibana_index,type,id).source({
      user: 'guest',
      group: 'guest',
      title: save.title,
      dashboard: angular.toJson(save)
    })
    
    if (type === 'temp')
      request = request.ttl(ttl)

    // TOFIX: Implement error handling here
    return request.doIndex(
      // Success
      function(result) {
        return result;
      },
      // Failure
      function(result) {
        return false;
      }
    );


  }

  this.elasticsearch_delete = function(id) {
    return ejs.Document(config.kibana_index,'dashboard',id).doDelete(
      // Success
      function(result) {
        return result;
      },
      // Failure
      function(result) {
        return false;
      }
    );
  }

  this.elasticsearch_list = function(query,count) {
    var request = ejs.Request().indices(config.kibana_index).types('dashboard');
    return request.query(
      ejs.QueryStringQuery(query || '*')
      ).size(count).doSearch(
        // Success
        function(result) {
          return result;
        },
        // Failure
        function(result) {
          return false;
        }
      );
  }

  // TOFIX: Gist functionality
  this.save_gist = function(title,dashboard) {
    var save = _.clone(dashboard || self.current)
    save.title = title || self.current.title;
    return $http({
      url: "https://api.github.com/gists",
      method: "POST",
      data: {
        "description": save.title,
        "public": false,
        "files": {
          "kibana-dashboard.json": {
            "content": angular.toJson(save,true)
          }
        }
      }
    }).then(function(data, status, headers, config) {
      return data.data.html_url;
    }, function(data, status, headers, config) {
      return false;
    });
  }

  this.gist_list = function(id) {
    return $http.jsonp("https://api.github.com/gists/"+id+"?callback=JSON_CALLBACK"
    ).then(function(response) {
      var files = []
      _.each(response.data.data.files,function(v,k) {
        try {
          var file = JSON.parse(v.content)
          files.push(file)
        } catch(e) {
          // Nothing?
        }
      });
      return files;
    }, function(data, status, headers, config) {
      return false;
    });
  }

  this.dash_load = function(dashboard) {
    self.current = dashboard;
    timer.cancel_all();
    return true;
  }

  this.gist_id = function(string) {
    if(self.is_gist(string))
      return string.match(gist_pattern)[0].replace(/.*\//, '');
  }

  this.is_gist = function(string) {
    if(!_.isUndefined(string) && string != '' && !_.isNull(string.match(gist_pattern)))
      return string.match(gist_pattern).length > 0 ? true : false;
    else
      return false
  }

})
.service('keylistener', function($rootScope) {
  var keys = [];
  $(document).keydown(function (e) {
    keys[e.which] = true;
  });

  $(document).keyup(function (e) {
    delete keys[e.which];
  });

  this.keyActive = function(key) {
    return keys[key] == true;
  }
});