class DataIBGE

# File lib/eia/data.rb, line 5
def initialize(table_code, date, variable, location, classification, unit, value, periodicity)
        @table_code = table_code
        @date = standardize_date(date, periodicity)
        @variable = variable
        @location = location

        #is an array
        @classification = classification

        @unit = unit
        @value = value

        #The standard is:
        # 2 : "Mês"
        # 4 : "Trimestre"
        # 5 : "Ano"
        # 6 : "Trimestre Módel"
        @periodicity = periodicity 
end

# File lib/eia/data.rb, line 41
def is_valid?
        if @table_code == '' or @table_code == nil or @table_code.to_i <= 0 then
                puts "Invalid table code supplied. Value is #{@table_code}."
                return false
        end

        if @date == '' or @date == "ERROR" or @date == nil then
                puts "Date found is invalid. Value is '#{@date}'."
                return false
        end
        
        if @variable == '' or @variable == nil then
                puts "Variable found is invalid. Value is '#{@variable}'."
                return false
        end

        if @location == '' or @location == nil then
                puts "Location found is invalid. Value is '#{@location}'."
                return false
        end

        if @unit == '' or @unit == nil then
                puts "Unit found is invalid. Value is '#{@unit}'."
                return false
        end

        if @periodicity == nil or @periodicity.to_i > 6 or @periodicity.to_i < 0 then
                puts "Periodicity is invalid. Value is '#{@periodicity}'."
                return false
        end

        if @value == '' or @value == nil then
                puts "Value found is invalid. Value is '#{@value}'."
                return false
        end

        if @classification == nil or not @classification.class.to_s.eql? "Array" then
                puts "Classification is invalid. Value is nil."
                return false
        end

        return true 
end

# File lib/eia/data.rb, line 25
def standardize_date(date, periodicity)
        #date is a four digit number
        if periodicity == 5 then
                return "01/01/#{date}"

        elsif [2, 4, 6].include?(periodicity) then
                y = date[0..3]
                m = date[4..5]

                return "01/#{m}/#{y}"                
        else
                puts "\nError parsing date for DataIBGE. Attempted to parse #{date}.\n"
                return "ERROR"
        end
end