add create sell and buy crypto order mutations

app/graphql/inputs/create_buy_crypto_order_attributes_input.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+module Inputs
+  class CreateBuyCryptoOrderAttributesInput < Types::BaseInputObject
+    argument :currency_id, ID, required: true
+    argument :amount_cents, Integer, "Amount to be paid", required: true
+  end
+end

app/graphql/inputs/create_sell_crypto_order_attributes_input.rb

@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+module Inputs
+  class CreateSellCryptoOrderAttributesInput < Types::BaseInputObject
+    argument :currency_id, ID, required: true
+    argument :amount, String, "Amount to be paid", required: true
+  end
+end

app/graphql/mutations/base_mutation.rb

@@ -6,8 +6,16 @@ module Mutations
     input_object_class Types::BaseInputObject
     object_class Types::BaseObject
 
-    field :errors, [String],
+    field :errors, [Types::RecordInvalidType],
       null: true,
       description: "Errors encountered during execution of the mutation."
+
+    def current_user
+      context[:current_user]
+    end
+
+    def decode_id(encoded_id)
+      GraphQL::Schema::UniqueWithinType.decode(encoded_id).last
+    end
   end
 end

app/graphql/mutations/create_buy_crypto_order.rb

@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+module Mutations
+  class CreateBuyCryptoOrder < BaseMutation
+    field :order, Types::BuyCryptoOrderType, null: true
+
+    argument :order, Inputs::CreateBuyCryptoOrderAttributesInput, required: true
+
+    def resolve(order:)
+      currency_id = decode_id(order[:currency_id])
+
+      ActiveRecord::Base.transaction do
+        current_user.fiat_balance.withdrawal!(order[:amount_cents])
+
+        record = BuyCryptoOrder.create!(
+          paid_amount_cents: order[:amount_cents],
+          currency_id: currency_id,
+          user_id: current_user.id,
+        )
+
+        { order: record }
+      rescue ActiveRecord::RecordInvalid => e
+        { errors: Resolvers::ModelErrors.from_active_record_model(e.record) }
+      end
+    end
+  end
+end

app/graphql/mutations/create_sell_crypto_order.rb

@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+module Mutations
+  class CreateSellCryptoOrder < BaseMutation
+    field :order, Types::SellCryptoOrderType, null: true
+
+    argument :order, Inputs::CreateSellCryptoOrderAttributesInput, required: true
+
+    def resolve(order:)
+      currency_id = decode_id(order[:currency_id])
+      amount = BigDecimal(order[:amount])
+
+      ActiveRecord::Base.transaction do
+        current_user.balances.find_by!(currency_id: currency_id)
+          .withdrawal!(amount)
+
+        record = SellCryptoOrder.create(
+          paid_amount: amount,
+          currency_id: currency_id,
+          user_id: current_user.id,
+        )
+
+        { order: record }
+      rescue ActiveRecord::RecordInvalid => e
+        { errors: Resolvers::ModelErrors.from_active_record_model(e.record) }
+      end
+    end
+  end
+end

app/graphql/resolvers/model_errors.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+module Resolvers
+  class ModelErrors
+    attr_reader :full_messages, :field_name, :messages, :path
+
+    def initialize(args)
+      @full_messages = args[:full_messages]
+      @field_name = args[:field_name]
+      @messages = args[:messages]
+      @path = args[:path]
+    end
+
+    def self.from_active_record_model(model)
+      return if model&.errors.blank?
+
+      model.errors.messages.map do |field, messages|
+        new(
+          full_messages: model.errors.full_messages_for(field),
+          field_name: field,
+          messages: messages,
+          path: ["attributes", field]
+        )
+      end
+    end
+
+    def self.from_active_record_model_errors(errors)
+      return if errors.blank?
+
+      errors.messages.map do |field, messages|
+        new(
+          full_messages: errors.full_messages_for(field),
+          field_name: field,
+          messages: messages,
+          path: ["attributes", field]
+        )
+      end
+    end
+  end
+end

app/graphql/types/buy_crypto_order_type.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+module Types
+  class BuyCryptoOrderType < Types::BaseObject
+    implements GraphQL::Types::Relay::Node
+    global_id_field :id
+
+    graphql_name "BuyCryptoOrder"
+
+    field :id, ID, null: false
+
+    field :currency, CurrencyType, null: false
+    def currency
+      dataloader.with(Dataloader::Source, Currency).load(object.currency_id)
+    end
+
+    field :status, ProcessStatusEnum, null: false
+    field :paid_amount_cents, Integer, null: false
+    field :received_amount, String, null: true
+    field :created_at, GraphQL::Types::ISO8601DateTime, null: false
+    field :updated_at, GraphQL::Types::ISO8601DateTime, null: false
+  end
+end

app/graphql/types/fiat_balance_type.rb

@@ -9,7 +9,5 @@ module Types
     field :id, ID, null: false
     field :amount_cents, Integer, null: false
     field :amount_currency, String, null: false
-    field :created_at, GraphQL::Types::ISO8601DateTime, null: false
-    field :updated_at, GraphQL::Types::ISO8601DateTime, null: false
   end
 end

app/graphql/types/mutation_type.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 module Types
   class MutationType < Types::BaseObject
+    field :create_sell_crypto_order, mutation: Mutations::CreateSellCryptoOrder
+    field :create_buy_crypto_order, mutation: Mutations::CreateBuyCryptoOrder
   end
 end

app/graphql/types/process_status_enum.rb

@@ -0,0 +1,10 @@
+# frozen_string_literal: true
+module Types
+  class ProcessStatusEnum < Types::BaseEnum
+    graphql_name "ProcessStatus"
+
+    value "PROCESSING", value: "processing"
+    value "COMPLETED", value: "completed"
+    value "CANCELED", value: "canceled"
+  end
+end

app/graphql/types/query_type.rb

@@ -18,5 +18,15 @@ module Types
     def fiat_balances
       Pundit.policy_scope(current_user, FiatBalance)
     end
+
+    field :sell_crypto_orders, SellCryptoOrderType.connection_type, null: false
+    def sell_crypto_orders
+      []
+    end
+
+    field :buy_crypto_orders, BuyCryptoOrderType.connection_type, null: false
+    def buy_crypto_orders
+      []
+    end
   end
 end

app/graphql/types/record_invalid_type.rb

@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module Types
+  class RecordInvalidType < Types::BaseObject
+    graphql_name "RecordInvalid"
+    field :full_messages, [String], null: false
+    field :field_name, String, null: true
+    field :messages, [String], null: true
+    field :path, [String], null: true
+  end
+end

app/graphql/types/sell_crypto_order_type.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+module Types
+  class SellCryptoOrderType < Types::BaseObject
+    implements GraphQL::Types::Relay::Node
+    global_id_field :id
+
+    graphql_name "SellCryptoOrder"
+
+    field :id, ID, null: false
+
+    field :currency, CurrencyType, null: false
+    def currency
+      dataloader.with(Dataloader::Source, Currency).load(object.currency_id)
+    end
+
+    field :status, ProcessStatusEnum, null: false
+    field :paid_amount, String, null: false
+    field :received_amount_cents, Integer, null: true
+    field :created_at, GraphQL::Types::ISO8601DateTime, null: false
+    field :updated_at, GraphQL::Types::ISO8601DateTime, null: false
+  end
+end

app/graphql/x_stake_schema.rb

@@ -1,6 +1,6 @@
 # frozen_string_literal: true
 class XStakeSchema < GraphQL::Schema
-  # mutation(Types::MutationType)
+  mutation(Types::MutationType)
   query(Types::QueryType)
   use GraphQL::Dataloader