# Copyright (C) 2012-2014 Zammad Foundation, http://zammad-foundation.org/

class SessionsController < ApplicationController

  # "Create" a login, aka "log the user in"
  def create

    # in case, remove switched_from_user_id
    session[:switched_from_user_id] = nil

    # authenticate user
    user = User.authenticate( params[:username], params[:password] )

    # auth failed
    if !user
      render :json => { :error => 'login failed' }, :status => :unauthorized
      return
    end

    # remember me - set session cookie to expire later
    if params[:remember_me]
      request.env['rack.session.options'][:expire_after] = 1.year
    else
      request.env['rack.session.options'][:expire_after] = nil
    end
    # both not needed to set :expire_after works fine
    #  request.env['rack.session.options'][:renew] = true
    #  reset_session

    # set session user
    current_user_set(user)

    # log new session
    user.activity_stream_log( 'session started', user.id, true )

    # auto population of default collections
    collections, assets = SessionHelper::default_collections(user)

    # add session user assets
    assets = user.assets(assets)

    # get models
    models = SessionHelper::models(user)

    # check logon session
    logon_session_key = nil
    if params['logon_session']
      logon_session_key = Digest::MD5.hexdigest( rand(999999).to_s + Time.new.to_s )
      #      session = ActiveRecord::SessionStore::Session.create(
      #        :session_id => logon_session_key,
      #        :data => {
      #          :user_id => user['id']
      #        }
      #      )
    end

    # return new session data
    render :json => {
      :session       => user,
      :models        => models,
      :collections   => collections,
      :assets        => assets,
      :logon_session => logon_session_key,
    },
    :status => :created
  end

  def show

    user_id = nil

    # no valid sessions
    if session[:user_id]
      user_id = session[:user_id]
    end

    # check logon session
    if params['logon_session']
      session = SessionHelper::get( params['logon_session'] )
      if session
        user_id = session.data[:user_id]
      end
    end

    if !user_id
      # get models
      models = SessionHelper::models()

      render :json => {
        :error  => 'no valid session',
        :config => config_frontend,
        :models => models,
      }
      return
    end

    # Save the user ID in the session so it can be used in
    # subsequent requests
    user = User.find( user_id )

    # auto population of default collections
    collections, assets = SessionHelper::default_collections(user)

    # add session user assets
    assets = user.assets(assets)

    # get models
    models = SessionHelper::models(user)

    # return current session
    render :json => {
      :session      => user,
      :models       => models,
      :collections  => collections,
      :assets       => assets,
      :config       => config_frontend,
    }
  end

  # "Delete" a login, aka "log the user out"
  def destroy

    # Remove the user id from the session
    @_current_user = session[:user_id] = nil

    # reset session cookie (reset :expire_after in case remember_me is active)
    request.env['rack.session.options'][:expire_after] = -1.year
    request.env['rack.session.options'][:renew] = true

    render :json => { }
  end

  def create_omniauth

    # in case, remove switched_from_user_id
    session[:switched_from_user_id] = nil

    auth = request.env['omniauth.auth']

    if !auth
      logger.info("AUTH IS NULL, SERVICE NOT LINKED TO ACCOUNT")

      # redirect to app
      redirect_to '/'
    end

    # Create a new user or add an auth to existing user, depending on
    # whether there is already a user signed in.
    authorization = Authorization.find_from_hash(auth)
    if !authorization
      authorization = Authorization.create_from_hash(auth, current_user)
    end

    # set current session user
    current_user_set(authorization.user)

    # log new session
    user.activity_stream_log( 'session started', authorization.user.id, true )

    # remember last login date
    authorization.user.update_last_login

    # redirect to app
    redirect_to '/'
  end

  def create_sso

    # in case, remove switched_from_user_id
    session[:switched_from_user_id] = nil

    user = User.sso(params)

    # Log the authorizing user in.
    if user

      # set current session user
      current_user_set(user)

      # log new session
      user.activity_stream_log( 'session started', user.id, true )

      # remember last login date
      user.update_last_login
    end

    # redirect to app
    redirect_to '/#'
  end

  # "switch" to user
  def switch_to_user
    return if deny_if_not_role('Admin')

    # check user
    if !params[:id]
      render(
        :json   => { :message => 'no user given' },
        :status => :not_found
      )
      return false
    end

    user = User.lookup( :id => params[:id] )
    if !user
      render(
        :json   => {},
        :status => :not_found
      )
      return false
    end

    # remember old user
    session[:switched_from_user_id] = current_user.id

    # log new session
    user.activity_stream_log( 'switch to', current_user.id, true )

    # set session user
    current_user_set(user)

    redirect_to '/#'
  end

  # "switch" back to user
  def switch_back_to_user

    # check if it's a swich back
    if !session[:switched_from_user_id]
      response_access_deny
      return false
    end

    user = User.lookup( :id => session[:switched_from_user_id] )
    if !user
      render(
        :json   => {},
        :status => :not_found
      )
      return false
    end

    # rememeber current user
    current_session_user = current_user

    # remove switched_from_user_id
    session[:switched_from_user_id] = nil

    # set old session user again
    current_user_set(user)

    # log end session
    current_session_user.activity_stream_log( 'ended switch to', user.id, true )

    redirect_to '/#'
  end

  def list
    return if deny_if_not_role('Admin')
    assets = {}
    sessions_clean = []
    SessionHelper.list.each {|session|
      next if !session.data['user_id']
      sessions_clean.push session
      if session.data['user_id']
        user = User.lookup( :id => session.data['user_id'] )
        assets = user.assets( assets )
      end
    }
    render :json => {
      :sessions => sessions_clean,
      :assets   => assets,
    }
  end

  def delete
    return if deny_if_not_role('Admin')
    SessionHelper::destroy( params[:id] )
    render :json => {}
  end

=begin

Resource:
GET /api/v1/sessions/logo

Response:
<IMAGE>

Test:
curl http://localhost/api/v1/sessions/logo

=end

  def logo

    # cache image
    #response.headers['Expires'] = 1.year.from_now.httpdate
    #response.headers["Cache-Control"] = "cache, store, max-age=31536000, must-revalidate"
    #response.headers["Pragma"] = "cache"

    # find logo
    list = Store.list( :object => 'System::Logo', :o_id => 2 )
    if list && list[0]
      file = Store.find( list[0] )
      send_data(
        file.content,
        :filename    => file.filename,
        :type        => file.preferences['Content-Type'],
        :disposition => 'inline'
      )
      return
    end

    # serve default image
    send_data(
      '',
      :filename    => '',
      :type        => 'image/gif',
      :disposition => 'inline'
    )
  end
end