require 'norikra/version'
require 'norikra/error'
require 'norikra/logger'

require 'norikra/webui'

require 'norikra/stats'

require 'sinatra/base'
require 'sinatra/json'
require 'erubis'

class Norikra::WebUI::Handler < Sinatra::Base
  set :public_folder, File.absolute_path(File.join(File.dirname(__FILE__), '..', '..', '..', 'public'))
  set :views, File.absolute_path(File.join(File.dirname(__FILE__), '..', '..', '..', 'views'))
  set :erb, :escape_html => true

  enable :sessions

  def norikra_version; Norikra::VERSION ; end

  def logger ; Norikra::Log.logger ; end

  def self.engine=(engine)
    @@engine = engine
  end

  def logging(type, handler, args=[], opts={})
    if type == :manage
      debug "WebUI", :handler => handler.to_s, :args => args
    else
      trace "WebUI", :handler => handler.to_s, :args => args
    end

    begin
      yield
    rescue Norikra::ClientError => e
      logger.info "WebUI #{e.class}: #{e.message}"
      if opts[:on_error_hook]
        opts[:on_error_hook].call(e.class, e.message)
      else
        halt 400, e.message
      end
    rescue => e
      logger.error "WebUI #{e.class}: #{e.message}"
      e.backtrace.each do |t|
        logger.error "  " + t
      end
      if opts[:on_error_hook]
        opts[:on_error_hook].call(e.class, e.message)
      else
        halt 500, e.message
      end
    end
  end

  def engine; @@engine; end

  def targets
    engine.targets.map(&:name)
  end

  get '/' do
    logging(:show, :index) do
      @page = "summary"

      input_data,session[:input_data] = session[:input_data],nil

      queries = engine.queries.sort
      pooled_events = Hash[* queries.map{|q| [q.name, engine.output_pool.pool.fetch(q.name, []).size.to_s]}.flatten]

      engine_targets = engine.targets.sort
      targets = engine_targets.map{|t|
        {
          name: t.name,
          auto_field: t.auto_field,
          fields: engine.typedef_manager.field_list(t.name),
          modified: t.last_modified.to_s,
        }
      }

      erb :index, :layout => :base, :locals => {
        input_data: input_data,
        stat: engine.statistics,
        queries: queries,
        pool: pooled_events,
        targets: targets,
      }
    end
  end

  post '/close' do
    target_name = params[:target]
    logging(:manage, :close, [target_name]) do
      engine.close(target_name)
      redirect '/'
    end
  end

  post '/register' do
    query_name,query_group,expression = params[:query_name], params[:query_group], params[:expression]

    error_hook = lambda{ |error_class, error_message|
      session[:input_data] = {
        query_add: {
          query_name: query_name, query_group: query_group, expression: expression,
          error: error_message,
        },
      }
      redirect '/#query_add'
    }

    logging(:manage, :register, [query_name, query_group, expression], :on_error_hook => error_hook) do
      if query_name.nil? || query_name.empty?
        raise Norikra::ClientError, "Query name MUST NOT be blank"
      end
      if query_group.nil? || query_group.empty?
        query_group = nil
      end
      engine.register(Norikra::Query.new(:name => query_name, :group => query_group, :expression => expression))
      redirect '/#queries'
    end
  end

  post '/deregister' do
    query_name = params[:query_name]
    logging(:manage, :deregister, [query_name]) do
      engine.deregister(query_name)
      redirect '/#queries'
    end
  end

  get '/stat/dump' do
    logging(:show, :stat_dump) do
      stats = Norikra::Stats.generate(engine)
      date = Time.now.strftime('%Y-%m-%d')
      attachment "stats.dump.#{date}.json"
      stats.to_json
    end
  end

  get '/json/query/:name' do
    query_name = params[:name]
    logging(:show, :json_query, [query_name]) do
      query = engine.queries.select{|q| q.name == query_name}.first
      if query
        content = {
          name: query.name,
          group: query.group || "(default)",
          targets: query.targets,
          expression: query.expression,
          events: engine.output_pool.fetch(query.name).size
        }
        json content
      else
        halt 404
      end
    end
  end

  get '/json/events_sample/:query_name' do
    query_name = params[:query_name]
    logging(:show, :json_query, [query_name]) do
      query = engine.queries.select{|q| q.name == query_name}.first
      if query
        events = engine.output_pool.fetch(query.name).last(5)
        json events
      else
        halt 404
      end
    end
  end

  get '/json/target/:name' do
    target_name = params[:name]
    logging(:show, :json_target, [target_name]) do
      target = engine.targets.select{|t| t.name == target_name}.first
      if target
        content = {
          name: target.name,
          auto_field: target.auto_field,
          fields: engine.typedef_manager.field_list(target.name)
        }
        json content
      else
        halt 404
      end
    end
  end

end