Add new market endpoints

Condenses market prices and history into a single call, and allows the
user to search for multiple item IDs, across multiple servers, or across
an entire data center. Also allows the results to be filtered using max
history and columns.

Removes the deprecated endpoint for looking up market categories by
server.

Author: mattantonelli

lib/xivapi/request.rb

@@ -61,25 +61,25 @@ def servers(group: false)
     request(self, endpoint)
   end
 
-  # @param server [String] Server to retrieve the market for
-  # @param id [Integer] ID of the item to price
-  # @return [OpenStruct] Maret price results
-  def market_price(server: nil, id: nil)
-    request(self, "market/#{server}/items/#{id}")
-  end
-
-  # @param server [String] Server to retrieve the market for
-  # @param id [Integer] ID of the item to price
-  # @return [OpenStruct] Market history results
-  def market_history(server: nil, id: nil)
-    request(self, "market/#{server}/items/#{id}/history")
-  end
-
-  # @param server [String] Server to retrieve the market for
-  # @param id [Integer] ID of the category to retrieve
-  # @return [Array<OpenStruct>] Market category results
-  def market_category(server: nil, id: nil)
-    request(self, "market/#{server}/category/#{id}")
+  # @param ids [Integer, Array<Integer>] ID(s) of the item(s) to look up
+  # @param servers [String, Array<String>] Server(s) to retrieve the market for
+  # @param data_center [String] Data center to retrieve the market for
+  # @param max_history [Integer] The maximum amount of history to retrieve
+  # @param columns [String, Array <String>] One or more columns to limit results to
+  # @return [OpenStruct] Market price results
+  def market(ids: [], servers: [], data_center: nil, max_history: nil, columns: [])
+    ids, server_names = [*ids], [*servers]
+    params = { max_history: max_history, columns: [*columns].join(',') }
+
+    if ids.size > 1
+      params.merge!(ids: ids.join(','), dc: data_center, servers: server_names.join(','))
+      request(self, 'market/items', params)
+    elsif data_center || server_names.size > 1 || server_names[0].match?(',')
+      params.merge!(dc: data_center, servers: server_names.join(','))
+      request(self, "market/item/#{ids.first}", params)
+    else
+      request(self, "market/#{server_names.first}/item/#{ids.first}", params)
+    end
   end
 
   # @return [Array<OpenStruct>] List of Market categories