Add reader for shipments

lib/planet_express_express.rb

@@ -2,7 +2,7 @@
 
 require_relative "planet_express_express/version"
 require_relative "planet_express_express/constants"
-
+require_relative "planet_express_express/shipment_reader"
 
 module PlanetExpressExpress
   class Error < StandardError; end

lib/planet_express_express/shipment_reader.rb

@@ -0,0 +1,66 @@
+module PlanetExpressExpress
+  require 'date'
+  class ShipmentReader
+    def initialize(prices)
+      @prices = prices
+    end
+
+    # Expects to read a file
+    def read_shipments(io)
+      shipments = {
+        S: [],
+        M: [],
+        L: []
+      }
+
+      current_month = 0
+      current_year = 0
+      x = 0
+      io.lines.each do |line|
+        shipment = parse(line)
+
+        if shipment[:date].year != current_year || shipment[:date].month != current_month
+          close_month(shipments)
+        end
+        shipments[shipment[:size]].last.push(shipment)
+
+        current_year = shipment[:date].year
+        current_month = shipment[:date].month
+        x += 1
+      end
+
+      shipments
+    end
+
+    private
+
+    attr_reader :prices
+
+    def close_month(shipments)
+      shipments.keys.each do |key|
+        shipments[key].push([])
+      end
+    end
+
+    def parse(line)
+      parts = line.split(" ")
+
+      shipment = {
+        date: Date.parse(parts[0]),
+        size: parts[1]&.to_sym,
+        provider: parts[2]&.to_sym,
+        price: 0,
+        discount: 0,
+        valid: true
+      }
+
+      shipment[:price] = prices[
+        [
+          shipment[:provider], shipment[:size]
+        ]
+      ]
+
+      shipment
+    end
+  end
+end