class EntriesController < ApplicationController
	before_action :authenticate_user!
	before_action :set_entry, only: %i[edit update destroy stop_timer]
	
	def index
		@entries       = current_user.entries.order(date: :desc)
		@running_entry = current_user.entries.find_by(end_time: nil, beschreibung: "Timer")
		# Gesamtzeit in Minuten
		@total_minutes = @entries.sum { |e| e.hours.to_i * 60 + e.minutes.to_i }
		
		@total_minutes_praktikum_prop = @entries.where(praktikums_typ: Entry::PRAKTIKUMSTYPEN[0], entry_art: Entry::ENTRY_ARTEN[0]).sum { |e| e.hours.to_i * 60 + e.minutes.to_i }
		
		@total_minutes_praktikum_fach = @entries.where(praktikums_typ: Entry::PRAKTIKUMSTYPEN[1], entry_art: Entry::ENTRY_ARTEN[0]).sum { |e| e.hours.to_i * 60 + e.minutes.to_i }
		
		# Gesamtbetrag der Kilometerpauschale
		@total_kilometer_pauschale = @entries.sum(&:kilometer_pauschale)
		
		# Zeitverbrauch je Kombination (typ + art)
		@time_by_typ_art = @entries.group_by(&:praktikums_typ).transform_values do |group|
			group.group_by(&:entry_art).transform_values do |entries|
				entries.sum { |e| e.hours.to_i * 60 + e.minutes.to_i }
			end
		end
		
		@completion_percent_by_typ_art = {}
		

		
		# Verbleibende Minuten je Kombination
		@remaining_minutes_matrix = {}
		@time_by_typ_art.each do |typ, arts|
			@remaining_minutes_matrix[typ] ||= {}
			
			arts.each do |art, spent_minutes|
				target                              = current_user.required_hours_matrix.dig(typ, art).to_i * 60
				remaining                           = [target - spent_minutes, 0].max
				@remaining_minutes_matrix[typ][art] = remaining
			end
		end
		
		User::PRAKTIKUMSTYPEN.product(User::ENTRY_ARTEN).each do |typ, art|
			total_required = current_user.required_hours_matrix.to_h.dig(typ, art).to_f
			remaining_minutes = @remaining_minutes_matrix.dig(typ, art).to_i
			required_minutes = (total_required * 60).to_i
			entries_exist = current_user.entries.where(praktikums_typ: typ, entry_art: art).exists?
			
			Rails.logger.info "=== #{art} #{typ} ==="
			Rails.logger.info "Erforderlich (min): #{required_minutes}, Verbleibend: #{remaining_minutes}, Einträge vorhanden? #{entries_exist}"
			
			if total_required > 0 && entries_exist
				done_minutes = required_minutes - remaining_minutes
				percent = (done_minutes / required_minutes.to_f * 100).round
				percent = 100 if percent > 100
				@completion_percent_by_typ_art[[typ, art]] = percent
			else
				@completion_percent_by_typ_art[[typ, art]] = 0
			end
		end

		
		@total_kilometer_costs_by_year  = Entry.total_kilometer_cost_by_year(current_user)
		@fortbildungskosten_by_year     = Entry.total_fortbildungskosten_by_year(current_user)
		@selbstsupervision_by_year      = Entry.total_supervision_by_year(current_user)
		@selbsterfahrungskosten_by_year = Entry.total_selbsterfahrungskosten_by_year(current_user)
		@allekosten_by_year             = Entry.total_semesterkosten_by_year(current_user)
		
		# Voraussichtliches Ende je Kombination basierend auf weekly_target_matrix
		#
		@estimated_end_by_typ_art = {}
		@remaining_minutes_matrix.each do |typ, arts|
			@estimated_end_by_typ_art[typ] ||= {}
			
			arts.each do |art, remaining_minutes|
				hours_remaining = remaining_minutes / 60.0
				weekly_hours    = current_user.weekly_target_matrix.dig(typ, art).to_f
				if weekly_hours > 0
					weeks_remaining                     = (hours_remaining / weekly_hours).ceil
					@estimated_end_by_typ_art[typ][art] = Date.today + weeks_remaining.weeks
				else
					@estimated_end_by_typ_art[typ][art] = nil
				end
			end
		end
	end
	
	def new
		@entry = current_user.entries.build
	end
	
	def start_timer
		
		typ = params[:typ]
		art = params[:art]
		
		@entry = current_user.entries.create!(start_time: Time.current, beschreibung: "Timer", praktikums_typ: typ, entry_art: art)
		redirect_to entries_path, notice: "Timer gestartet"
	end
	
	# neue Aktion: Timer stoppen
	def stop_timer
		#@entry = current_user.entries.where(end_time: nil).order(start_time: :desc).first
		if @entry
			@entry.end_time            = Time.current
			@entry.lunch_break_minutes = 30 if ActiveModel::Type::Boolean.new.cast(params[:lunch_break])
			
			total_minutes  = @entry.total_minutes_including_break
			@entry.hours   = total_minutes / 60
			@entry.minutes = total_minutes % 60
			
			@entry.save!
			notice = "Eintrag gestoppt – Gesamtzeit: #{@entry.hours} h #{@entry.minutes} min"
		else
			notice = "Kein laufender Eintrag gefunden"
		end
		redirect_to entries_path, notice: notice
	end
	
	def create
		@entry = current_user.entries.new(entry_params)
		if current_user.praepedeutikum_abgeschlossen? && @entry.praktikums_typ == 'propädeutikum'
			redirect_to entries_path, alert: "Propädeutikum ist bereits abgeschlossen – Neuer Eintrag dieses Typs ist nicht erlaubt."
			return
		end
		if @entry.save
			redirect_to entries_path, notice: "Eintrag gespeichert"
		else
			render :new
		end
	end
	
	def edit
		@entry
	end
	
	def update
		if @entry.update(entry_params)
			redirect_to entries_path, notice: "Eintrag aktualisiert"
		else
			render :edit
		end
	end
	
	def destroy
		@entry.destroy
		redirect_to entries_path, notice: "Eintrag gelöscht"
	end
	
	def export_csv
		@entries = current_user.entries.order(date: :desc)
		
		respond_to do |format|
			format.csv { send_data @entries.to_csv, filename: "eintraege-#{Date.today}.csv" }
		end
	end
	
	def monthly_report
		# Nur die wirklich benötigten Spalten abfragen
		rows = current_user.entries
		       .select(
			       Arel.sql("DATE_TRUNC('month', date) AS month"),
			       :praktikums_typ,
			       :entry_art,
			       Arel.sql("SUM(hours * 60 + minutes) AS total_minutes")
		       )
		       .group(
			       Arel.sql("DATE_TRUNC('month', date)"),
			       :praktikums_typ,
			       :entry_art
		       )
		       .order(Arel.sql("DATE_TRUNC('month', date) DESC"))
		
		# In Hash-Struktur für die View umwandeln
		@report = {}
		rows.each do |r|
			month   = r.attributes["month"].to_date
			total   = r.attributes["total_minutes"].to_i
			typ_art = [r.praktikums_typ, r.entry_art]
			
			@report[month]          ||= {}
			@report[month][typ_art] = {
				total_minutes: total,
				hours:         total / 60,
				minutes:       total % 60
			}
		end
	end
	
	private
	
	def set_entry
		@entry = current_user.entries.find(params[:id])
	end
	
	def entry_params
		params.require(:entry).permit(
			:date,
			:hours,
			:minutes,
			:praktikums_typ,
			:entry_art,
			:distance_km,
			:beschreibung,
			:kosten,
			:zaehlt_als_fortbildung
		)
	end

end