fga-gpp-mds/2017.1-OndeE-UnB

class ParserController < ApplicationController
  before_action :authenticate_admin!
  def index
    render plain: schedules
  end

  def geo_data
    '{"type":"FeatureCollection","features":[{"type":"Feature","properties":{},"geometry":{"type":"Polygon","coordinates":[[[-47.867375314235694,-15.762756116441665],[-47.86702126264573,-15.762497981882012],[-47.866597473621376,-15.763055552119592],[-47.8669622540474,-15.763303360622453],[-47.867375314235694,-15.762756116441665]]]}}]}'
  end

  def exclude_departments
    %w(FGA FCE FUP)
  end

  def allowed_buildings
    %w(ICC PAT PJC)
  end

  def replace_building_name(building)
    buildings = [ ['BSA N', 'BSAN'], ['BSA S', 'BSAS'] ]
    buildings.each do |replace|
      building.gsub(replace[0], replace[1])
    end
    building
  end

  def clean_room_name(room_name)
    room_name.delete('.', '')
    room_name
  end

  def define_room_type(room)
    if room.include? 'ANF'
      :amphitheater
    elsif room.include? 'LAB'
      :laboratory
    else
      :classroom
    end
  end

  def set_day_of_week(day_of_week)
    case day_of_week
    when 'Segunda'
      :monday
    when 'Terça'
      :tuesday
    when 'Quarta'
      :wednesday
    when 'Quinta'
      :thursday
    when 'Sexta'
      :friday
    when 'Sábado'
      :saturday
    when 'Domingo'
      :sunday
    end
  end

  def valid_schedule_and_room?(day_of_week, start_time, end_time, room, classroom)
    valid_times = day_of_week.present? && start_time.present? && end_time.present?
    valid_room = room.present? && (room != 'Local a Designar') && classroom.present?
    valid_times && valid_room
  end

  # Departments parser
  def departments
    require 'nokogiri'
    require 'open-uri'
    html = open('https://matriculaweb.unb.br/graduacao/oferta_dep.aspx?cod=1')
    html_tree = Nokogiri::HTML(html, nil, Encoding::UTF_8.to_s)
    departments_rows = html_tree.css('.FrameCinza tr')
    departments_rows.shift # Remove the first department row
    departments = []

    departments_rows.each do |department_row|
      acronym = department_row.at('td[2]').text
      department = department_row.at('td[3] a')

      # Adds the department only if its not in the exclude list.
      unless exclude_departments.include? acronym
        department_data = {
          acronym: acronym,
          title: department.text,
          url: "https://matriculaweb.unb.br/graduacao/#{department['href']}"
        }
        puts department_data
        departments.push(department_data)
      end
    end

    departments
  end

  # Courses parser
  def courses
    require 'nokogiri'
    require 'open-uri'

    courses = []
    departments.each do |department|
      html = open(department[:url])
      html_tree = Nokogiri::HTML(html, nil, Encoding::UTF_8.to_s)

      courses_rows = html_tree.css('.FrameCinza tr')

      # Ignore the first course row
      courses_rows.shift

      # Getting courses data
      courses_rows.each do |courses_row|
        course = courses_row.at('td[2] a')
        course_data = {
          department: department,
          title: course.text,
          url: "https://matriculaweb.unb.br/graduacao/#{course['href']}"
        }

        puts course_data
        # puts in the courses list course_data
        courses.push(course_data)
      end
    end

    courses
  end

  # Data parser
  def schedules
    require 'nokogiri'
    require 'open-uri'

    courses.each do |course|
      html = open(course[:url])
      html_tree = Nokogiri::HTML(html, nil, Encoding::UTF_8.to_s)
      schedules_rows = html_tree.css('.framecinza tr')

      # Getting the time and places of courses
      schedules_rows.each do |schedule_row|
        if schedule_row.content.include? 'Total'
          classroom = schedule_row.at_css('td[1] b')
          schedule_row.css('td[4] div').each do |schedule|
            day_of_week = schedule.at_css('b')
            start_time = schedule.at_css('font[color="black"] b')
            end_time = schedule.at_css('font[color="brown"]')
            room = schedule.at_css('i')

            if valid_schedule_and_room?(day_of_week, start_time, end_time, room, classroom)
              room = clean_room_name(room.text.strip)

              building = replace_building_name(room.split.first).strip

              if allowed_buildings.include? building

                schedule_data = {
                  course: course,
                  day_of_week: set_day_of_week(day_of_week.text),
                  start_time: start_time.text,
                  end_time: end_time.text,
                  building: building,
                  room: room,
                  room_type: define_room_type(room),
                  classroom: classroom.text
                }

                puts schedule_data
                create_schedule(schedule_data)

              end
            end
          end
        end
      end
    end
 end

  def create_schedule(params)
    room = create_room(params)
    Schedule.where(room: room, day_of_week: params[:day_of_week], start_time: params[:start_time], end_time: params[:end_time]).first_or_create do |schedule|
      schedule.title = params[:course][:title]
      schedule.code = 0
      schedule.classroom = params[:classroom]
    end
  end

  def create_room(params)
    Room.where(acronym: params[:room]).first_or_create do |room|
    room.building = create_building(params)
    room.title = params[:room]
    room.room_type = params[:room_type]
    room.level = 0
    room.latitude = 0
    room.longitude = 0
    room.geo_data = geo_data
   end
  end

  def create_building(params)
    Building.where(acronym: params[:building]).first_or_create do |building|
      building.title = params[:building]
      building.acronym = params[:building]
      building.latitude = 0
      building.longitude = 0
      building.phone = 0
      building.geo_data = geo_data
    end
  end
end