module Feature.RangeSpec where

import Test.Hspec
import Test.Hspec.Wai
import Test.Hspec.Wai.JSON
import Network.HTTP.Types
import Network.Wai.Test (SResponse(simpleHeaders,simpleStatus))

import qualified Data.ByteString.Lazy         as BL

import SpecHelper
import Network.Wai (Application)

import Protolude hiding (get)

defaultRange :: BL.ByteString
defaultRange = [json| { "min": 0, "max": 15 } |]

emptyRange :: BL.ByteString
emptyRange = [json| { "min": 2, "max": 2 } |]

spec :: SpecWith Application
spec = do
  describe "POST /rpc/getitemrange" $ do
    context "without range headers" $ do
      context "with response under server size limit" $
        it "returns whole range with status 200" $
           post "/rpc/getitemrange" defaultRange `shouldRespondWith` 200

      context "when I don't want the count" $ do
        it "returns range Content-Range with */* for empty range" $
          request methodPost "/rpc/getitemrange" [] emptyRange
            `shouldRespondWith` [json| [] |] {matchHeaders = ["Content-Range" <:> "*/*"]}

        it "returns range Content-Range with range/*" $
          request methodPost "/rpc/getitemrange" [] defaultRange
            `shouldRespondWith` [json| [{"id":1},{"id":2},{"id":3},{"id":4},{"id":5},{"id":6},{"id":7},{"id":8},{"id":9},{"id":10},{"id":11},{"id":12},{"id":13},{"id":14},{"id":15}] |]
            { matchHeaders = ["Content-Range" <:> "0-14/*"] }

    context "with range headers" $ do

      context "of acceptable range" $ do
        it "succeeds with partial content" $ do
          r <- request methodPost  "/rpc/getitemrange"
                       (rangeHdrs $ ByteRangeFromTo 0 1) defaultRange
          liftIO $ do
            simpleHeaders r `shouldSatisfy`
              matchHeader "Content-Range" "0-1/*"
            simpleStatus r `shouldBe` ok200

        it "understands open-ended ranges" $
          request methodPost "/rpc/getitemrange"
                  (rangeHdrs $ ByteRangeFrom 0) defaultRange
            `shouldRespondWith` 200

        it "returns an empty body when there are no results" $
          request methodPost "/rpc/getitemrange"
                  (rangeHdrs $ ByteRangeFromTo 0 1) emptyRange
            `shouldRespondWith` "[]"
            { matchStatus  = 200
            , matchHeaders = ["Content-Range" <:> "*/*"]
            }

        it "allows one-item requests" $ do
          r <- request methodPost  "/rpc/getitemrange"
                       (rangeHdrs $ ByteRangeFromTo 0 0) defaultRange
          liftIO $ do
            simpleHeaders r `shouldSatisfy`
              matchHeader "Content-Range" "0-0/*"
            simpleStatus r `shouldBe` ok200

        it "handles ranges beyond collection length via truncation" $ do
          r <- request methodPost  "/rpc/getitemrange"
                       (rangeHdrs $ ByteRangeFromTo 10 100) defaultRange
          liftIO $ do
            simpleHeaders r `shouldSatisfy`
              matchHeader "Content-Range" "10-14/*"
            simpleStatus r `shouldBe` ok200

      context "of invalid range" $ do
        it "fails with 416 for offside range" $
          request methodPost  "/rpc/getitemrange"
                  (rangeHdrs $ ByteRangeFromTo 1 0) emptyRange
            `shouldRespondWith` 416

        it "refuses a range with nonzero start when there are no items" $
          request methodPost "/rpc/getitemrange"
                  (rangeHdrsWithCount $ ByteRangeFromTo 1 2) emptyRange
            `shouldRespondWith` "[]"
            { matchStatus  = 416
            , matchHeaders = ["Content-Range" <:> "*/0"]
            }

        it "refuses a range requesting start past last item" $
          request methodPost "/rpc/getitemrange"
                  (rangeHdrsWithCount $ ByteRangeFromTo 100 199) defaultRange
            `shouldRespondWith` "[]"
            { matchStatus  = 416
            , matchHeaders = ["Content-Range" <:> "*/15"]
            }

  describe "GET /items" $ do
    context "without range headers" $ do
      context "with response under server size limit" $
        it "returns whole range with status 200" $
          get "/items" `shouldRespondWith` 200

      context "when I don't want the count" $ do
        it "returns range Content-Range with /*" $
          request methodGet "/menagerie"
                  [("Prefer", "count=none")] ""
            `shouldRespondWith` "[]"
            { matchStatus  = 200
            , matchHeaders = ["Content-Range" <:> "*/*"]
            }

        it "returns range Content-Range with range/*" $
          request methodGet "/items?order=id"
                  [("Prefer", "count=none")] ""
            `shouldRespondWith` [json| [{"id":1},{"id":2},{"id":3},{"id":4},{"id":5},{"id":6},{"id":7},{"id":8},{"id":9},{"id":10},{"id":11},{"id":12},{"id":13},{"id":14},{"id":15}] |]
            { matchHeaders = ["Content-Range" <:> "0-14/*"] }

        it "returns range Content-Range with range/* even using other filters" $
          request methodGet "/items?id=eq.1&order=id"
                  [("Prefer", "count=none")] ""
            `shouldRespondWith` [json| [{"id":1}] |]
            { matchHeaders = ["Content-Range" <:> "0-0/*"] }

    context "with limit/offset parameters" $ do
      it "no parameters return everything" $
        get "/items?select=id&order=id.asc"
          `shouldRespondWith`
          [json|[{"id":1},{"id":2},{"id":3},{"id":4},{"id":5},{"id":6},{"id":7},{"id":8},{"id":9},{"id":10},{"id":11},{"id":12},{"id":13},{"id":14},{"id":15}]|]
          { matchStatus  = 200
          , matchHeaders = ["Content-Range" <:> "0-14/*"]
          }
      it "top level limit with parameter" $
        get "/items?select=id&order=id.asc&limit=3"
          `shouldRespondWith` [json|[{"id":1},{"id":2},{"id":3}]|]
          { matchStatus  = 200
          , matchHeaders = ["Content-Range" <:> "0-2/*"]
          }
      it "headers override get parameters" $
        request methodGet  "/items?select=id&order=id.asc&limit=3"
                     (rangeHdrs $ ByteRangeFromTo 0 1) ""
          `shouldRespondWith` [json|[{"id":1},{"id":2}]|]
          { matchStatus  = 200
          , matchHeaders = ["Content-Range" <:> "0-1/*"]
          }

      it "limit works on all levels" $
        get "/clients?select=id,projects{id,tasks{id}}&order=id.asc&limit=1&projects.order=id.asc&projects.limit=2&projects.tasks.order=id.asc&projects.tasks.limit=1"
          `shouldRespondWith`
          [json|[{"id":1,"projects":[{"id":1,"tasks":[{"id":1}]},{"id":2,"tasks":[{"id":3}]}]}]|]
          { matchStatus  = 200
          , matchHeaders = ["Content-Range" <:> "0-0/*"]
          }


      it "limit and offset works on first level" $
        get "/items?select=id&order=id.asc&limit=3&offset=2"
          `shouldRespondWith` [json|[{"id":3},{"id":4},{"id":5}]|]
          { matchStatus  = 200
          , matchHeaders = ["Content-Range" <:> "2-4/*"]
          }

    context "with range headers" $ do

      context "of acceptable range" $ do
        it "succeeds with partial content" $ do
          r <- request methodGet  "/items"
                       (rangeHdrs $ ByteRangeFromTo 0 1) ""
          liftIO $ do
            simpleHeaders r `shouldSatisfy`
              matchHeader "Content-Range" "0-1/*"
            simpleStatus r `shouldBe` ok200

        it "understands open-ended ranges" $
          request methodGet "/items"
                  (rangeHdrs $ ByteRangeFrom 0) ""
            `shouldRespondWith` 200

        it "returns an empty body when there are no results" $
          request methodGet "/menagerie"
                  (rangeHdrs $ ByteRangeFromTo 0 1) ""
            `shouldRespondWith` "[]"
            { matchStatus  = 200
            , matchHeaders = ["Content-Range" <:> "*/*"]
            }

        it "allows one-item requests" $ do
          r <- request methodGet  "/items"
                       (rangeHdrs $ ByteRangeFromTo 0 0) ""
          liftIO $ do
            simpleHeaders r `shouldSatisfy`
              matchHeader "Content-Range" "0-0/*"
            simpleStatus r `shouldBe` ok200

        it "handles ranges beyond collection length via truncation" $ do
          r <- request methodGet  "/items"
                       (rangeHdrs $ ByteRangeFromTo 10 100) ""
          liftIO $ do
            simpleHeaders r `shouldSatisfy`
              matchHeader "Content-Range" "10-14/*"
            simpleStatus r `shouldBe` ok200

      context "of invalid range" $ do
        it "fails with 416 for offside range" $
          request methodGet  "/items"
                  (rangeHdrs $ ByteRangeFromTo 1 0) ""
            `shouldRespondWith` 416

        it "refuses a range with nonzero start when there are no items" $
          request methodGet "/menagerie"
                  (rangeHdrsWithCount $ ByteRangeFromTo 1 2) ""
            `shouldRespondWith` "[]"
            { matchStatus  = 416
            , matchHeaders = ["Content-Range" <:> "*/0"]
            }

        it "refuses a range requesting start past last item" $
          request methodGet "/items"
                  (rangeHdrsWithCount $ ByteRangeFromTo 100 199) ""
            `shouldRespondWith` "[]"
            { matchStatus  = 416
            , matchHeaders = ["Content-Range" <:> "*/15"]
            }