module Aws.Sqs.Commands.QueueAttributes where

import           Aws.Core
import           Aws.Sqs.Core
import           Text.XML.Cursor       (($/), ($//), (&/), (&|))
import qualified Data.ByteString.Char8 as B
import qualified Data.Text             as T
import qualified Data.Text.Encoding    as TE
import qualified Text.XML.Cursor       as Cu

data GetQueueAttributes = GetQueueAttributes {
  gqaQueueName :: QueueName,
  gqaAttributes :: [QueueAttribute]
}deriving (Show)

data GetQueueAttributesResponse = GetQueueAttributesResponse{
  gqarAttributes :: [(QueueAttribute,T.Text)]
} deriving (Show)

parseAttributes :: Cu.Cursor -> [(QueueAttribute, T.Text)]
parseAttributes el = do
  name <- force "Missing Name" $ el $/ Cu.laxElement "Name" &/ Cu.content
  value <- force "Missing Value" $ el $/ Cu.laxElement "Value" &/ Cu.content
  parsedName <- parseQueueAttribute name
  return (parsedName, value)

instance ResponseConsumer r GetQueueAttributesResponse where
    type ResponseMetadata GetQueueAttributesResponse = SqsMetadata
    responseConsumer _ _ = sqsXmlResponseConsumer parse
      where
        parse el = do
          let attributes = concat $ el $// Cu.laxElement "Attribute" &| parseAttributes
          return GetQueueAttributesResponse{ gqarAttributes = attributes }

formatAttributes :: [QueueAttribute] -> [(B.ByteString, Maybe B.ByteString)]
formatAttributes attrs =
  case length attrs of
    0 -> undefined
    1 -> [("AttributeName", Just $ B.pack $ T.unpack $ printQueueAttribute $ attrs !! 0)]
    _ -> zipWith (\ x y -> ((B.concat ["AttributeName.", B.pack $ show $ y]), Just $ B.pack $ T.unpack $ printQueueAttribute x) ) attrs [1 :: Integer ..]

-- | ServiceConfiguration: 'SqsConfiguration'
instance SignQuery GetQueueAttributes where
    type ServiceConfiguration GetQueueAttributes = SqsConfiguration
    signQuery GetQueueAttributes{..} = sqsSignQuery SqsQuery {
                                              sqsQueueName = Just gqaQueueName,
                                              sqsQuery = [("Action", Just "GetQueueAttributes")] ++ (formatAttributes gqaAttributes)}

instance Transaction GetQueueAttributes GetQueueAttributesResponse

instance AsMemoryResponse GetQueueAttributesResponse where
    type MemoryResponse GetQueueAttributesResponse = GetQueueAttributesResponse
    loadToMemory = return

data SetQueueAttributes = SetQueueAttributes{
  sqaAttribute :: QueueAttribute,
  sqaValue :: T.Text,
  sqaQueueName :: QueueName 
}deriving (Show)

data SetQueueAttributesResponse = SetQueueAttributesResponse{
} deriving (Show)

instance ResponseConsumer r SetQueueAttributesResponse where
    type ResponseMetadata SetQueueAttributesResponse = SqsMetadata
    responseConsumer _ _ = sqsXmlResponseConsumer parse
      where 
        parse _ = do
          return SetQueueAttributesResponse {}
          
-- | ServiceConfiguration: 'SqsConfiguration'
instance SignQuery SetQueueAttributes  where 
    type ServiceConfiguration SetQueueAttributes  = SqsConfiguration
    signQuery SetQueueAttributes {..} = sqsSignQuery SqsQuery { 
                                             sqsQueueName = Just sqaQueueName,
                                             sqsQuery = [("Action", Just "SetQueueAttributes"), 
                                                        ("Attribute.Name", Just $ TE.encodeUtf8 $ printQueueAttribute sqaAttribute),
                                                        ("Attribute.Value", Just $ TE.encodeUtf8 sqaValue)]} 

instance Transaction SetQueueAttributes SetQueueAttributesResponse

instance AsMemoryResponse SetQueueAttributesResponse where
    type MemoryResponse SetQueueAttributesResponse = SetQueueAttributesResponse
    loadToMemory = return