class Entry < ApplicationRecord
  
  require 'csv'
  
  
  belongs_to :user
  
  validates :date, :hours, :minutes, presence: true
  validates :hours, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
  validates :minutes, numericality: { only_integer: true, greater_than_or_equal_to: 0, less_than: 60 }
  
  before_save :normalize_time
  
  PRAKTIKUMSTYPEN = %w[propädeutikum fachspezifikum]
  ENTRY_ARTEN = %w[Praktikum Selbsterfahrung Supervision Fortbildung Semesterkosten]
  
  validates :praktikums_typ, inclusion: { in: PRAKTIKUMSTYPEN }
  validates :entry_art, inclusion: { in: ENTRY_ARTEN }
  validates :distance_km, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
  
  after_initialize :set_default_date, if: :new_record?
  
  def set_default_date
    self.date ||= Date.today
  end
  
  def kilometer_pauschale
    return 0 unless distance_km.present?
    distance_km * 0.42
  end
  
  def self.total_fortbildungskosten_by_year(user)
    where(user: user, entry_art: 'Fortbildung')
      .group_by { |e| e.date.year }
      .transform_values { |entries| entries.sum { |e| e.kosten.to_f } }
  end
  
  def self.total_selbsterfahrungskosten_by_year(user)
    where(user: user, entry_art: 'Selbsterfahrung')
      .group_by { |e| e.date.year }
      .transform_values { |entries| entries.sum { |e| e.kosten.to_f } }
  end
  
  def self.total_supervision_by_year(user)
    where(user: user, entry_art: 'Supervision')
      .group_by { |e| e.date.year }
      .transform_values { |entries| entries.sum { |e| e.kosten.to_f } }
  end
  
  def self.total_semesterkosten_by_year(user)
    where(user: user)
      .group_by { |e| e.date.year }
      .transform_values { |entries| entries.sum { |e| e.kosten.to_f } }
  end
  
  def jahr
    date.year
  end
  
  def total_minutes
    hours * 60 + minutes
  end
  def self.to_csv
    CSV.generate(headers: true, col_sep: ";") do |csv|
      csv << %w[Datum Stunden Minuten Typ Art Kilometer User]
      
      all.each do |entry|
        csv << [
          entry.date,
          entry.hours,
          entry.minutes,
          entry.praktikums_typ,
          entry.entry_art,
          entry.distance_km,
          entry.beschreibung,
          entry.kosten,
          entry.user.email
        ]
      end
    end
  end
  private
  
  def normalize_time
    self.hours += minutes / 60
    self.minutes = minutes % 60
  end
end