{-# language DataKinds #-}
{-# language FlexibleContexts #-}
{-# language FlexibleInstances #-}
{-# language MultiParamTypeClasses #-}
{-# language NamedFieldPuns #-}
{-# language ScopedTypeVariables #-}
{-# language StandaloneKindSignatures #-}
{-# language TypeApplications #-}
{-# language TypeFamilies #-}
{-# language UndecidableInstances #-}

module Rel8.Table.NonEmpty
  ( NonEmptyTable(..)
  , ($+)
  , nonEmptyTable
  , nameNonEmptyTable
  )
where

-- base
import Data.Functor.Identity ( Identity( Identity ) )
import Data.Kind ( Type )
import Data.List.NonEmpty ( NonEmpty )
import Prelude hiding ( id )

-- rel8
import Rel8.Expr ( Expr )
import Rel8.Expr.Array ( sappend1, snonEmptyOf )
import Rel8.Schema.Dict ( Dict( Dict ) )
import Rel8.Schema.HTable.NonEmpty ( HNonEmptyTable )
import Rel8.Schema.HTable.Vectorize
  ( hvectorize, hunvectorize
  , happend
  , hproject, hcolumn
  )
import qualified Rel8.Schema.Kind as K
import Rel8.Schema.Name ( Name( Name ) )
import Rel8.Schema.Null ( Nullity( Null, NotNull ) )
import Rel8.Schema.Result ( vectorizer, unvectorizer )
import Rel8.Schema.Spec ( Spec(..) )
import Rel8.Table
  ( Table, Context, Columns, fromColumns, toColumns
  , FromExprs, fromResult, toResult
  , Transpose
  )
import Rel8.Table.Alternative ( AltTable, (<|>:) )
import Rel8.Table.Eq ( EqTable, eqTable )
import Rel8.Table.Ord ( OrdTable, ordTable )
import Rel8.Table.Projection
  ( Projectable, Projecting, Projection, project, apply
  )
import Rel8.Table.Serialize ( ToExprs )


-- | A @NonEmptyTable@ value contains one or more instances of @a@. You
-- construct @NonEmptyTable@s with 'Rel8.some' or 'nonEmptyAgg'.
type NonEmptyTable :: K.Context -> Type -> Type
newtype NonEmptyTable context a =
  NonEmptyTable (HNonEmptyTable (Columns a) (Context a))


instance Projectable (NonEmptyTable context) where
  project :: forall a b.
Projecting a b =>
Projection a b
-> NonEmptyTable context a -> NonEmptyTable context b
project Projection a b
f (NonEmptyTable HNonEmptyTable (Columns a) (Context a)
a) = forall (context :: * -> *) a.
HNonEmptyTable (Columns a) (Context a) -> NonEmptyTable context a
NonEmptyTable (forall (t :: HTable) (t' :: HTable) (list :: * -> *)
       (context :: * -> *).
(forall (ctx :: * -> *). t ctx -> t' ctx)
-> HVectorize list t context -> HVectorize list t' context
hproject (forall a b (context :: * -> *).
Projecting a b =>
Projection a b -> Columns a context -> Columns b context
apply Projection a b
f) HNonEmptyTable (Columns a) (Context a)
a)


instance (Table context a, context ~ context') =>
  Table context' (NonEmptyTable context a)
 where
  type Columns (NonEmptyTable context a) = HNonEmptyTable (Columns a)
  type Context (NonEmptyTable context a) = Context a
  type FromExprs (NonEmptyTable context a) = NonEmpty (FromExprs a)
  type Transpose to (NonEmptyTable context a) =
    NonEmptyTable to (Transpose to a)

  fromColumns :: Columns (NonEmptyTable context a) context'
-> NonEmptyTable context a
fromColumns = forall (context :: * -> *) a.
HNonEmptyTable (Columns a) (Context a) -> NonEmptyTable context a
NonEmptyTable
  toColumns :: NonEmptyTable context a
-> Columns (NonEmptyTable context a) context'
toColumns (NonEmptyTable HNonEmptyTable (Columns a) (Context a)
a) = HNonEmptyTable (Columns a) (Context a)
a
  fromResult :: Columns (NonEmptyTable context a) Result
-> FromExprs (NonEmptyTable context a)
fromResult = forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (forall (context :: * -> *) a.
Table context a =>
Columns a Result -> FromExprs a
fromResult @_ @a) forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (t :: HTable) (f :: * -> *) (list :: * -> *)
       (context :: * -> *) (context' :: * -> *).
(HTable t, Zip f, Vector list) =>
(forall a. Spec a -> context (list a) -> f (context' a))
-> HVectorize list t context -> f (t context')
hunvectorize forall (f :: * -> *) a.
Functor f =>
Spec a -> Result (f a) -> f (Result a)
unvectorizer
  toResult :: FromExprs (NonEmptyTable context a)
-> Columns (NonEmptyTable context a) Result
toResult = forall (t :: HTable) (f :: * -> *) (list :: * -> *)
       (context :: * -> *) (context' :: * -> *).
(HTable t, Unzip f, Vector list) =>
(forall a. Spec a -> f (context a) -> context' (list a))
-> f (t context) -> HVectorize list t context'
hvectorize forall (f :: * -> *) a.
Functor f =>
Spec a -> f (Result a) -> Result (f a)
vectorizer forall b c a. (b -> c) -> (a -> b) -> a -> c
. forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap (forall (context :: * -> *) a.
Table context a =>
FromExprs a -> Columns a Result
toResult @_ @a)


instance (EqTable a, context ~ Expr) =>
  EqTable (NonEmptyTable context a)
 where
  eqTable :: Columns (NonEmptyTable context a) (Dict (Sql DBEq))
eqTable =
    forall (t :: HTable) (f :: * -> *) (list :: * -> *)
       (context :: * -> *) (context' :: * -> *).
(HTable t, Unzip f, Vector list) =>
(forall a. Spec a -> f (context a) -> context' (list a))
-> f (t context) -> HVectorize list t context'
hvectorize
      (\Spec {Nullity a
nullity :: forall a. Spec a -> Nullity a
nullity :: Nullity a
nullity} (Identity Dict (Sql DBEq) a
Dict) -> case Nullity a
nullity of
        Nullity a
Null -> forall {a} (c :: a -> Constraint) (a :: a). c a => Dict c a
Dict
        Nullity a
NotNull -> forall {a} (c :: a -> Constraint) (a :: a). c a => Dict c a
Dict)
      (forall a. a -> Identity a
Identity (forall a. EqTable a => Columns a (Dict (Sql DBEq))
eqTable @a))


instance (OrdTable a, context ~ Expr) =>
  OrdTable (NonEmptyTable context a)
 where
  ordTable :: Columns (NonEmptyTable context a) (Dict (Sql DBOrd))
ordTable =
    forall (t :: HTable) (f :: * -> *) (list :: * -> *)
       (context :: * -> *) (context' :: * -> *).
(HTable t, Unzip f, Vector list) =>
(forall a. Spec a -> f (context a) -> context' (list a))
-> f (t context) -> HVectorize list t context'
hvectorize
      (\Spec {Nullity a
nullity :: Nullity a
nullity :: forall a. Spec a -> Nullity a
nullity} (Identity Dict (Sql DBOrd) a
Dict) -> case Nullity a
nullity of
        Nullity a
Null -> forall {a} (c :: a -> Constraint) (a :: a). c a => Dict c a
Dict
        Nullity a
NotNull -> forall {a} (c :: a -> Constraint) (a :: a). c a => Dict c a
Dict)
      (forall a. a -> Identity a
Identity (forall a. OrdTable a => Columns a (Dict (Sql DBOrd))
ordTable @a))


instance (ToExprs exprs a, context ~ Expr) =>
  ToExprs (NonEmptyTable context exprs) (NonEmpty a)


instance context ~ Expr => AltTable (NonEmptyTable context) where
  <|>: :: forall a.
Table Expr a =>
NonEmptyTable context a
-> NonEmptyTable context a -> NonEmptyTable context a
(<|>:) = forall a. Semigroup a => a -> a -> a
(<>)


instance (Table Expr a, context ~ Expr) => Semigroup (NonEmptyTable context a)
 where
  NonEmptyTable HNonEmptyTable (Columns a) (Context a)
as <> :: NonEmptyTable context a
-> NonEmptyTable context a -> NonEmptyTable context a
<> NonEmptyTable HNonEmptyTable (Columns a) (Context a)
bs = forall (context :: * -> *) a.
HNonEmptyTable (Columns a) (Context a) -> NonEmptyTable context a
NonEmptyTable forall a b. (a -> b) -> a -> b
$
    forall (t :: HTable) (list :: * -> *) (context :: * -> *).
(HTable t, Vector list) =>
(forall a.
 Spec a -> context (list a) -> context (list a) -> context (list a))
-> HVectorize list t context
-> HVectorize list t context
-> HVectorize list t context
happend (forall a b. a -> b -> a
const forall a.
Expr (NonEmpty a) -> Expr (NonEmpty a) -> Expr (NonEmpty a)
sappend1) HNonEmptyTable (Columns a) (Context a)
as HNonEmptyTable (Columns a) (Context a)
bs


-- | Project a single expression out of a 'NonEmptyTable'.
($+) :: Projecting a (Expr b)
  => Projection a (Expr b) -> NonEmptyTable Expr a -> Expr (NonEmpty b)
Projection a (Expr b)
f $+ :: forall a b.
Projecting a (Expr b) =>
Projection a (Expr b) -> NonEmptyTable Expr a -> Expr (NonEmpty b)
$+ NonEmptyTable HNonEmptyTable (Columns a) (Context a)
a = forall (list :: * -> *) a (context :: * -> *).
HVectorize list (HIdentity a) context -> context (list a)
hcolumn forall a b. (a -> b) -> a -> b
$ forall (t :: HTable) (t' :: HTable) (list :: * -> *)
       (context :: * -> *).
(forall (ctx :: * -> *). t ctx -> t' ctx)
-> HVectorize list t context -> HVectorize list t' context
hproject (forall a b (context :: * -> *).
Projecting a b =>
Projection a b -> Columns a context -> Columns b context
apply Projection a (Expr b)
f) HNonEmptyTable (Columns a) (Context a)
a
infixl 4 $+


-- | Construct a @NonEmptyTable@ from a non-empty list of expressions.
nonEmptyTable :: Table Expr a => NonEmpty a -> NonEmptyTable Expr a
nonEmptyTable :: forall a. Table Expr a => NonEmpty a -> NonEmptyTable Expr a
nonEmptyTable =
  forall (context :: * -> *) a.
HNonEmptyTable (Columns a) (Context a) -> NonEmptyTable context a
NonEmptyTable forall b c a. (b -> c) -> (a -> b) -> a -> c
.
  forall (t :: HTable) (f :: * -> *) (list :: * -> *)
       (context :: * -> *) (context' :: * -> *).
(HTable t, Unzip f, Vector list) =>
(forall a. Spec a -> f (context a) -> context' (list a))
-> f (t context) -> HVectorize list t context'
hvectorize (\Spec {TypeInformation (Unnullify a)
info :: forall a. Spec a -> TypeInformation (Unnullify a)
info :: TypeInformation (Unnullify a)
info} -> forall a.
TypeInformation (Unnullify a)
-> NonEmpty (Expr a) -> Expr (NonEmpty a)
snonEmptyOf TypeInformation (Unnullify a)
info) forall b c a. (b -> c) -> (a -> b) -> a -> c
.
  forall (f :: * -> *) a b. Functor f => (a -> b) -> f a -> f b
fmap forall (context :: * -> *) a.
Table context a =>
a -> Columns a context
toColumns


-- | Construct a 'NonEmptyTable' in the 'Name' context. This can be useful if
-- you have a 'NonEmptyTable' that you are storing in a table and need to
-- construct a 'TableSchema'.
nameNonEmptyTable
  :: Table Name a
  => a -- ^ The names of the columns of elements of the list.
  -> NonEmptyTable Name a
nameNonEmptyTable :: forall a. Table Name a => a -> NonEmptyTable Name a
nameNonEmptyTable =
  forall (context :: * -> *) a.
HNonEmptyTable (Columns a) (Context a) -> NonEmptyTable context a
NonEmptyTable forall b c a. (b -> c) -> (a -> b) -> a -> c
.
  forall (t :: HTable) (f :: * -> *) (list :: * -> *)
       (context :: * -> *) (context' :: * -> *).
(HTable t, Unzip f, Vector list) =>
(forall a. Spec a -> f (context a) -> context' (list a))
-> f (t context) -> HVectorize list t context'
hvectorize (\Spec a
_ (Identity (Name String
a)) -> forall a. String -> Name a
Name String
a) forall b c a. (b -> c) -> (a -> b) -> a -> c
.
  forall (f :: * -> *) a. Applicative f => a -> f a
pure forall b c a. (b -> c) -> (a -> b) -> a -> c
.
  forall (context :: * -> *) a.
Table context a =>
a -> Columns a context
toColumns