-- Tests for parsing scalar expressions

{-# LANGUAGE OverloadedStrings #-}
module Language.SQL.SimpleSQL.ScalarExprs (scalarExprTests) where

import Language.SQL.SimpleSQL.TestTypes
import Language.SQL.SimpleSQL.Syntax

scalarExprTests :: TestItem
scalarExprTests = Group "scalarExprTests"
    [literals
    ,identifiers
    ,star
    ,parameter
    ,dots
    ,app
    ,caseexp
    ,convertfun     
    ,operators
    ,parens
    ,subqueries
    ,aggregates
    ,windowFunctions
    ,functionsWithReservedNames
    ]

literals :: TestItem
literals = Group "literals" $ map (uncurry (TestScalarExpr ansi2011))
    [("3", NumLit "3")
     ,("3.", NumLit "3.")
     ,("3.3", NumLit "3.3")
     ,(".3", NumLit ".3")
     ,("3.e3", NumLit "3.e3")
     ,("3.3e3", NumLit "3.3e3")
     ,(".3e3", NumLit ".3e3")
     ,("3e3", NumLit "3e3")
     ,("3e+3", NumLit "3e+3")
     ,("3e-3", NumLit "3e-3")
     ,("'string'", StringLit "'" "'" "string")
     ,("'string with a '' quote'", StringLit "'" "'" "string with a '' quote")
     ,("'1'", StringLit "'" "'" "1")
     ,("interval '3' day"
      ,IntervalLit Nothing "3" (Itf "day" Nothing) Nothing)
     ,("interval '3' day (3)"
      ,IntervalLit Nothing "3" (Itf "day" $ Just (3,Nothing)) Nothing)
     ,("interval '3 weeks'", TypedLit (TypeName [Name Nothing "interval"]) "3 weeks")
    ]

identifiers :: TestItem
identifiers = Group "identifiers" $ map (uncurry (TestScalarExpr ansi2011))
    [("iden1", Iden [Name Nothing "iden1"])
    --,("t.a", Iden2 "t" "a")
    ,("\"quoted identifier\"", Iden [Name (Just ("\"","\"")) "quoted identifier"])
    ,("\"from\"", Iden [Name (Just ("\"","\"")) "from"])
    ]

star :: TestItem
star = Group "star" $ map (uncurry (TestScalarExpr ansi2011))
    [("*", Star)
    --,("t.*", Star2 "t")
    --,("ROW(t.*,42)", App "ROW" [Star2 "t", NumLit "42"])
    ]

parameter :: TestItem
parameter = Group "parameter"
    [TestScalarExpr ansi2011 "?" Parameter
    ,TestScalarExpr postgres "$13" $ PositionalArg 13]


dots :: TestItem
dots = Group "dot" $ map (uncurry (TestScalarExpr ansi2011))
    [("t.a", Iden [Name Nothing "t",Name Nothing "a"])
    ,("t.*", BinOp (Iden [Name Nothing "t"]) [Name Nothing "."] Star)
    ,("a.b.c", Iden [Name Nothing "a",Name Nothing "b",Name Nothing "c"])
    ,("ROW(t.*,42)", App [Name Nothing "ROW"] [BinOp (Iden [Name Nothing "t"]) [Name Nothing "."] Star, NumLit "42"])
    ]

app :: TestItem
app = Group "app" $ map (uncurry (TestScalarExpr ansi2011))
    [("f()", App [Name Nothing "f"] [])
    ,("f(a)", App [Name Nothing "f"] [Iden [Name Nothing "a"]])
    ,("f(a,b)", App [Name Nothing "f"] [Iden [Name Nothing "a"], Iden [Name Nothing "b"]])
    ]

caseexp :: TestItem
caseexp = Group "caseexp" $ map (uncurry (TestScalarExpr ansi2011))
    [("case a when 1 then 2 end"
     ,Case (Just $ Iden [Name Nothing "a"]) [([NumLit "1"]
                              ,NumLit "2")] Nothing)

    ,("case a when 1 then 2 when 3 then 4 end"
     ,Case (Just $ Iden [Name Nothing "a"]) [([NumLit "1"], NumLit "2")
                             ,([NumLit "3"], NumLit "4")] Nothing)

    ,("case a when 1 then 2 when 3 then 4 else 5 end"
     ,Case (Just $ Iden [Name Nothing "a"]) [([NumLit "1"], NumLit "2")
                             ,([NumLit "3"], NumLit "4")]
                             (Just $ NumLit "5"))

    ,("case when a=1 then 2 when a=3 then 4 else 5 end"
     ,Case Nothing [([BinOp (Iden [Name Nothing "a"]) [Name Nothing "="] (NumLit "1")], NumLit "2")
                   ,([BinOp (Iden [Name Nothing "a"]) [Name Nothing "="] (NumLit "3")], NumLit "4")]
                   (Just $ NumLit "5"))

    ,("case a when 1,2 then 10 when 3,4 then 20 end"
     ,Case (Just $ Iden [Name Nothing "a"]) [([NumLit "1",NumLit "2"]
                               ,NumLit "10")
                             ,([NumLit "3",NumLit "4"]
                               ,NumLit "20")]
                             Nothing)

    ]

convertfun :: TestItem 
convertfun = Group "convert" $ map (uncurry (TestScalarExpr sqlserver))
    [("CONVERT(varchar, 25.65)"
     ,Convert (TypeName [Name Nothing "varchar"]) (NumLit "25.65") Nothing)
    ,("CONVERT(datetime, '2017-08-25')"
     ,Convert (TypeName [Name Nothing "datetime"]) (StringLit "'" "'" "2017-08-25") Nothing)
    ,("CONVERT(varchar, '2017-08-25', 101)"
     ,Convert (TypeName [Name Nothing "varchar"]) (StringLit "'" "'" "2017-08-25") (Just 101))
    ]

operators :: TestItem
operators = Group "operators"
    [binaryOperators
    ,unaryOperators
    ,casts
    ,miscOps]

binaryOperators :: TestItem
binaryOperators = Group "binaryOperators" $ map (uncurry (TestScalarExpr ansi2011))
    [("a + b", BinOp (Iden [Name Nothing "a"]) [Name Nothing "+"] (Iden [Name Nothing "b"]))
     -- sanity check fixities
     -- todo: add more fixity checking

    ,("a + b * c"
     ,BinOp  (Iden [Name Nothing "a"]) [Name Nothing "+"]
             (BinOp (Iden [Name Nothing "b"]) [Name Nothing "*"] (Iden [Name Nothing "c"])))

    ,("a * b + c"
     ,BinOp (BinOp (Iden [Name Nothing "a"]) [Name Nothing "*"] (Iden [Name Nothing "b"]))
            [Name Nothing "+"] (Iden [Name Nothing "c"]))
    ]

unaryOperators :: TestItem
unaryOperators = Group "unaryOperators" $ map (uncurry (TestScalarExpr ansi2011))
    [("not a", PrefixOp [Name Nothing "not"] $ Iden [Name Nothing "a"])
    ,("not not a", PrefixOp [Name Nothing "not"] $ PrefixOp [Name Nothing "not"] $ Iden [Name Nothing "a"])
    ,("+a", PrefixOp [Name Nothing "+"] $ Iden [Name Nothing "a"])
    ,("-a", PrefixOp [Name Nothing "-"] $ Iden [Name Nothing "a"])
    ]


casts :: TestItem
casts = Group "operators" $ map (uncurry (TestScalarExpr ansi2011))
    [("cast('1' as int)"
     ,Cast (StringLit "'" "'" "1") $ TypeName [Name Nothing "int"])

    ,("int '3'"
     ,TypedLit (TypeName [Name Nothing "int"]) "3")

    ,("cast('1' as double precision)"
     ,Cast (StringLit "'" "'" "1") $ TypeName [Name Nothing "double precision"])

    ,("cast('1' as float(8))"
     ,Cast (StringLit "'" "'" "1") $ PrecTypeName [Name Nothing "float"] 8)

    ,("cast('1' as decimal(15,2))"
     ,Cast (StringLit "'" "'" "1") $ PrecScaleTypeName [Name Nothing "decimal"] 15 2)


    ,("double precision '3'"
     ,TypedLit (TypeName [Name Nothing "double precision"]) "3")
    ]

subqueries :: TestItem
subqueries = Group "unaryOperators" $ map (uncurry (TestScalarExpr ansi2011))
    [("exists (select a from t)", SubQueryExpr SqExists ms)
    ,("(select a from t)", SubQueryExpr SqSq ms)

    ,("a in (select a from t)"
     ,In True (Iden [Name Nothing "a"]) (InQueryExpr ms))

    ,("a not in (select a from t)"
     ,In False (Iden [Name Nothing "a"]) (InQueryExpr ms))

    ,("a > all (select a from t)"
     ,QuantifiedComparison (Iden [Name Nothing "a"]) [Name Nothing ">"] CPAll ms)

    ,("a = some (select a from t)"
     ,QuantifiedComparison (Iden [Name Nothing "a"]) [Name Nothing "="] CPSome ms)

    ,("a <= any (select a from t)"
     ,QuantifiedComparison (Iden [Name Nothing "a"]) [Name Nothing "<="] CPAny ms)
    ]
  where
    ms = toQueryExpr $ makeSelect
         {msSelectList = [(Iden [Name Nothing "a"],Nothing)]
         ,msFrom = [TRSimple [Name Nothing "t"]]
         }

miscOps :: TestItem
miscOps = Group "unaryOperators" $ map (uncurry (TestScalarExpr ansi2011))
    [("a in (1,2,3)"
     ,In True (Iden [Name Nothing "a"]) $ InList $ map NumLit ["1","2","3"])

    ,("a is null", PostfixOp [Name Nothing "is null"] (Iden [Name Nothing "a"]))
    ,("a is not null", PostfixOp [Name Nothing "is not null"] (Iden [Name Nothing "a"]))
    ,("a is true", PostfixOp [Name Nothing "is true"] (Iden [Name Nothing "a"]))
    ,("a is not true", PostfixOp [Name Nothing "is not true"] (Iden [Name Nothing "a"]))
    ,("a is false", PostfixOp [Name Nothing "is false"] (Iden [Name Nothing "a"]))
    ,("a is not false", PostfixOp [Name Nothing "is not false"] (Iden [Name Nothing "a"]))
    ,("a is unknown", PostfixOp [Name Nothing "is unknown"] (Iden [Name Nothing "a"]))
    ,("a is not unknown", PostfixOp [Name Nothing "is not unknown"] (Iden [Name Nothing "a"]))
    ,("a is distinct from b", BinOp (Iden [Name Nothing "a"]) [Name Nothing "is distinct from"] (Iden [Name Nothing "b"]))

    ,("a is not distinct from b"
     ,BinOp (Iden [Name Nothing "a"]) [Name Nothing "is not distinct from"] (Iden [Name Nothing "b"]))

    ,("a like b", BinOp (Iden [Name Nothing "a"]) [Name Nothing "like"] (Iden [Name Nothing "b"]))
    ,("a not like b", BinOp (Iden [Name Nothing "a"]) [Name Nothing "not like"] (Iden [Name Nothing "b"]))
    ,("a is similar to b", BinOp (Iden [Name Nothing "a"]) [Name Nothing "is similar to"] (Iden [Name Nothing "b"]))

    ,("a is not similar to b"
     ,BinOp (Iden [Name Nothing "a"]) [Name Nothing "is not similar to"] (Iden [Name Nothing "b"]))

    ,("a overlaps b", BinOp (Iden [Name Nothing "a"]) [Name Nothing "overlaps"] (Iden [Name Nothing "b"]))


-- special operators

    ,("a between b and c", SpecialOp [Name Nothing "between"] [Iden [Name Nothing "a"]
                                               ,Iden [Name Nothing "b"]
                                               ,Iden [Name Nothing "c"]])

    ,("a not between b and c", SpecialOp [Name Nothing "not between"] [Iden [Name Nothing "a"]
                                                       ,Iden [Name Nothing "b"]
                                                       ,Iden [Name Nothing "c"]])
    ,("(1,2)"
     ,SpecialOp [Name Nothing "rowctor"] [NumLit "1", NumLit "2"])


-- keyword special operators

    ,("extract(day from t)"
     , SpecialOpK [Name Nothing "extract"] (Just $ Iden [Name Nothing "day"]) [("from", Iden [Name Nothing "t"])])

    ,("substring(x from 1 for 2)"
     ,SpecialOpK [Name Nothing "substring"] (Just $ Iden [Name Nothing "x"]) [("from", NumLit "1")
                                               ,("for", NumLit "2")])

    ,("substring(x from 1)"
     ,SpecialOpK [Name Nothing "substring"] (Just $ Iden [Name Nothing "x"]) [("from", NumLit "1")])

    ,("substring(x for 2)"
     ,SpecialOpK [Name Nothing "substring"] (Just $ Iden [Name Nothing "x"]) [("for", NumLit "2")])

    ,("substring(x from 1 for 2 collate C)"
     ,SpecialOpK [Name Nothing "substring"] (Just $ Iden [Name Nothing "x"])
          [("from", NumLit "1")
          ,("for", Collate (NumLit "2") [Name Nothing "C"])])

-- this doesn't work because of a overlap in the 'in' parser

    ,("POSITION( string1 IN string2 )"
     ,SpecialOpK [Name Nothing "position"] (Just $ Iden [Name Nothing "string1"]) [("in", Iden [Name Nothing "string2"])])

    ,("CONVERT(char_value USING conversion_char_name)"
     ,SpecialOpK [Name Nothing "convert"] (Just $ Iden [Name Nothing "char_value"])
          [("using", Iden [Name Nothing "conversion_char_name"])])

    ,("TRANSLATE(char_value USING translation_name)"
     ,SpecialOpK [Name Nothing "translate"] (Just $ Iden [Name Nothing "char_value"])
          [("using", Iden [Name Nothing "translation_name"])])

{-
OVERLAY(string PLACING embedded_string FROM start
[FOR length])
-}

    ,("OVERLAY(string PLACING embedded_string FROM start)"
     ,SpecialOpK [Name Nothing "overlay"] (Just $ Iden [Name Nothing "string"])
          [("placing", Iden [Name Nothing "embedded_string"])
          ,("from", Iden [Name Nothing "start"])])

    ,("OVERLAY(string PLACING embedded_string FROM start FOR length)"
     ,SpecialOpK [Name Nothing "overlay"] (Just $ Iden [Name Nothing "string"])
          [("placing", Iden [Name Nothing "embedded_string"])
          ,("from", Iden [Name Nothing "start"])
          ,("for", Iden [Name Nothing "length"])])

{-
TRIM( [ [{LEADING | TRAILING | BOTH}] [removal_char] FROM ]
target_string
[COLLATE collation_name] )
-}



    ,("trim(from target_string)"
     ,SpecialOpK [Name Nothing "trim"] Nothing
          [("both", StringLit "'" "'" " ")
          ,("from", Iden [Name Nothing "target_string"])])

    ,("trim(leading from target_string)"
     ,SpecialOpK [Name Nothing "trim"] Nothing
          [("leading", StringLit "'" "'" " ")
          ,("from", Iden [Name Nothing "target_string"])])

    ,("trim(trailing from target_string)"
     ,SpecialOpK [Name Nothing "trim"] Nothing
          [("trailing", StringLit "'" "'" " ")
          ,("from", Iden [Name Nothing "target_string"])])

    ,("trim(both from target_string)"
     ,SpecialOpK [Name Nothing "trim"] Nothing
          [("both", StringLit "'" "'" " ")
          ,("from", Iden [Name Nothing "target_string"])])


    ,("trim(leading 'x' from target_string)"
     ,SpecialOpK [Name Nothing "trim"] Nothing
          [("leading", StringLit "'" "'" "x")
          ,("from", Iden [Name Nothing "target_string"])])

    ,("trim(trailing 'y' from target_string)"
     ,SpecialOpK [Name Nothing "trim"] Nothing
          [("trailing", StringLit "'" "'" "y")
          ,("from", Iden [Name Nothing "target_string"])])

    ,("trim(both 'z' from target_string collate C)"
     ,SpecialOpK [Name Nothing "trim"] Nothing
          [("both", StringLit "'" "'" "z")
          ,("from", Collate (Iden [Name Nothing "target_string"]) [Name Nothing "C"])])

    ,("trim(leading from target_string)"
     ,SpecialOpK [Name Nothing "trim"] Nothing
          [("leading", StringLit "'" "'" " ")
          ,("from", Iden [Name Nothing "target_string"])])


    ]

aggregates :: TestItem
aggregates = Group "aggregates" $ map (uncurry (TestScalarExpr ansi2011))
    [("count(*)",App [Name Nothing "count"] [Star])

    ,("sum(a order by a)"
    ,AggregateApp [Name Nothing "sum"] SQDefault [Iden [Name Nothing "a"]]
                  [SortSpec (Iden [Name Nothing "a"]) DirDefault NullsOrderDefault] Nothing)

    ,("sum(all a)"
    ,AggregateApp [Name Nothing "sum"] All [Iden [Name Nothing "a"]] [] Nothing)

    ,("count(distinct a)"
    ,AggregateApp [Name Nothing "count"] Distinct [Iden [Name Nothing "a"]] [] Nothing)
    ]

windowFunctions :: TestItem
windowFunctions = Group "windowFunctions" $ map (uncurry (TestScalarExpr ansi2011))
    [("max(a) over ()", WindowApp [Name Nothing "max"] [Iden [Name Nothing "a"]] [] [] Nothing)
    ,("count(*) over ()", WindowApp [Name Nothing "count"] [Star] [] [] Nothing)

    ,("max(a) over (partition by b)"
     ,WindowApp [Name Nothing "max"] [Iden [Name Nothing "a"]] [Iden [Name Nothing "b"]] [] Nothing)

    ,("max(a) over (partition by b,c)"
     ,WindowApp [Name Nothing "max"] [Iden [Name Nothing "a"]] [Iden [Name Nothing "b"],Iden [Name Nothing "c"]] [] Nothing)

    ,("sum(a) over (order by b)"
     ,WindowApp [Name Nothing "sum"] [Iden [Name Nothing "a"]] []
          [SortSpec (Iden [Name Nothing "b"]) DirDefault NullsOrderDefault] Nothing)

    ,("sum(a) over (order by b desc,c)"
     ,WindowApp [Name Nothing "sum"] [Iden [Name Nothing "a"]] []
          [SortSpec (Iden [Name Nothing "b"]) Desc NullsOrderDefault
          ,SortSpec (Iden [Name Nothing "c"]) DirDefault NullsOrderDefault] Nothing)

    ,("sum(a) over (partition by b order by c)"
     ,WindowApp [Name Nothing "sum"] [Iden [Name Nothing "a"]] [Iden [Name Nothing "b"]]
          [SortSpec (Iden [Name Nothing "c"]) DirDefault NullsOrderDefault] Nothing)

    ,("sum(a) over (partition by b order by c range unbounded preceding)"
     ,WindowApp [Name Nothing "sum"] [Iden [Name Nothing "a"]] [Iden [Name Nothing "b"]]
      [SortSpec (Iden [Name Nothing "c"]) DirDefault NullsOrderDefault]
      $ Just $ FrameFrom FrameRange UnboundedPreceding)

    ,("sum(a) over (partition by b order by c range 5 preceding)"
     ,WindowApp [Name Nothing "sum"] [Iden [Name Nothing "a"]] [Iden [Name Nothing "b"]]
      [SortSpec (Iden [Name Nothing "c"]) DirDefault NullsOrderDefault]
      $ Just $ FrameFrom FrameRange $ Preceding (NumLit "5"))

    ,("sum(a) over (partition by b order by c range current row)"
     ,WindowApp [Name Nothing "sum"] [Iden [Name Nothing "a"]] [Iden [Name Nothing "b"]]
      [SortSpec (Iden [Name Nothing "c"]) DirDefault NullsOrderDefault]
      $ Just $ FrameFrom FrameRange Current)

    ,("sum(a) over (partition by b order by c rows 5 following)"
     ,WindowApp [Name Nothing "sum"] [Iden [Name Nothing "a"]] [Iden [Name Nothing "b"]]
      [SortSpec (Iden [Name Nothing "c"]) DirDefault NullsOrderDefault]
      $ Just $ FrameFrom FrameRows $ Following (NumLit "5"))

    ,("sum(a) over (partition by b order by c range unbounded following)"
     ,WindowApp [Name Nothing "sum"] [Iden [Name Nothing "a"]] [Iden [Name Nothing "b"]]
      [SortSpec (Iden [Name Nothing "c"]) DirDefault NullsOrderDefault]
      $ Just $ FrameFrom FrameRange UnboundedFollowing)

    ,("sum(a) over (partition by b order by c \n\
      \range between 5 preceding and 5 following)"
     ,WindowApp [Name Nothing "sum"] [Iden [Name Nothing "a"]] [Iden [Name Nothing "b"]]
      [SortSpec (Iden [Name Nothing "c"]) DirDefault NullsOrderDefault]
      $ Just $ FrameBetween FrameRange
                            (Preceding (NumLit "5"))
                            (Following (NumLit "5")))

    ]

parens :: TestItem
parens = Group "parens" $ map (uncurry (TestScalarExpr ansi2011))
    [("(a)", Parens (Iden [Name Nothing "a"]))
    ,("(a + b)", Parens (BinOp (Iden [Name Nothing "a"]) [Name Nothing "+"] (Iden [Name Nothing "b"])))
    ]

functionsWithReservedNames :: TestItem
functionsWithReservedNames = Group "functionsWithReservedNames" $ map t
    ["abs"
    ,"char_length"
    ]
  where
    t fn = TestScalarExpr ansi2011 (fn <> "(a)") $ App [Name Nothing fn] [Iden [Name Nothing "a"]]