{-# LANGUAGE PatternSynonyms #-}

{- |
Module                  : Colog.Core.Severity
Copyright               : (c) 2018-2020 Kowainik, 2021-2022 Co-Log
SPDX-License-Identifier : MPL-2.0
Maintainer              : Co-Log <xrom.xkov@gmail.com>
Stability               : Stable
Portability             : Portable

This module introduces 'Severity' data type for expressing how severe the
message is. Also, it contains useful functions and patterns for work with 'Severity'.


 +-----------+---------+-----------------------------------------+-----------------------------+
 | Severity  | Pattern | Meaning                                 | Example                     |
 +===========+=========+=========================================+=============================+
 | 'Debug'   | 'D'     | Information useful for debug purposes   | Internal function call logs |
 +-----------+---------+-----------------------------------------+-----------------------------+
 | 'Info'    | 'I'     | Normal operational information          | Finish file uploading       |
 +-----------+---------+-----------------------------------------+-----------------------------+
 | 'Warning' | 'W'     | General warnings, non-critical failures | Image load error            |
 +-----------+---------+-----------------------------------------+-----------------------------+
 | 'Error'   | 'E'     | General errors/severe errors            | Could not connect to the DB |
 +-----------+---------+-----------------------------------------+-----------------------------+
-}

module Colog.Core.Severity
       ( Severity (..)
         -- ** Patterns
         -- $pattern
       , pattern D
       , pattern I
       , pattern W
       , pattern E
       , filterBySeverity
       , WithSeverity (..)
       , mapSeverity
       ) where

import Data.Ix (Ix)

import Colog.Core.Action (LogAction (..), cfilter)


-- | Severity for the log messages.
data Severity
    {- | Information useful for debug purposes.

    E.g. output of the function that is important for the internal development,
    not for users. Like, the result of SQL query.
    -}
    = Debug
    {- | Normal operational information.

    E.g. describing general steps: starting application, finished downloading.
    -}
    | Info
    {- | General warnings, non-critical failures.

    E.g. couldn't download icon from some service to display.
    -}
    | Warning
    {- | General errors/severe errors.

    E.g. exceptional situations: couldn't syncronize accounts.
    -}
    | Error
    deriving stock (Int -> Severity -> ShowS
[Severity] -> ShowS
Severity -> String
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
showList :: [Severity] -> ShowS
$cshowList :: [Severity] -> ShowS
show :: Severity -> String
$cshow :: Severity -> String
showsPrec :: Int -> Severity -> ShowS
$cshowsPrec :: Int -> Severity -> ShowS
Show, ReadPrec [Severity]
ReadPrec Severity
Int -> ReadS Severity
ReadS [Severity]
forall a.
(Int -> ReadS a)
-> ReadS [a] -> ReadPrec a -> ReadPrec [a] -> Read a
readListPrec :: ReadPrec [Severity]
$creadListPrec :: ReadPrec [Severity]
readPrec :: ReadPrec Severity
$creadPrec :: ReadPrec Severity
readList :: ReadS [Severity]
$creadList :: ReadS [Severity]
readsPrec :: Int -> ReadS Severity
$creadsPrec :: Int -> ReadS Severity
Read, Severity -> Severity -> Bool
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
/= :: Severity -> Severity -> Bool
$c/= :: Severity -> Severity -> Bool
== :: Severity -> Severity -> Bool
$c== :: Severity -> Severity -> Bool
Eq, Eq Severity
Severity -> Severity -> Bool
Severity -> Severity -> Ordering
Severity -> Severity -> Severity
forall a.
Eq a
-> (a -> a -> Ordering)
-> (a -> a -> Bool)
-> (a -> a -> Bool)
-> (a -> a -> Bool)
-> (a -> a -> Bool)
-> (a -> a -> a)
-> (a -> a -> a)
-> Ord a
min :: Severity -> Severity -> Severity
$cmin :: Severity -> Severity -> Severity
max :: Severity -> Severity -> Severity
$cmax :: Severity -> Severity -> Severity
>= :: Severity -> Severity -> Bool
$c>= :: Severity -> Severity -> Bool
> :: Severity -> Severity -> Bool
$c> :: Severity -> Severity -> Bool
<= :: Severity -> Severity -> Bool
$c<= :: Severity -> Severity -> Bool
< :: Severity -> Severity -> Bool
$c< :: Severity -> Severity -> Bool
compare :: Severity -> Severity -> Ordering
$ccompare :: Severity -> Severity -> Ordering
Ord, Int -> Severity
Severity -> Int
Severity -> [Severity]
Severity -> Severity
Severity -> Severity -> [Severity]
Severity -> Severity -> Severity -> [Severity]
forall a.
(a -> a)
-> (a -> a)
-> (Int -> a)
-> (a -> Int)
-> (a -> [a])
-> (a -> a -> [a])
-> (a -> a -> [a])
-> (a -> a -> a -> [a])
-> Enum a
enumFromThenTo :: Severity -> Severity -> Severity -> [Severity]
$cenumFromThenTo :: Severity -> Severity -> Severity -> [Severity]
enumFromTo :: Severity -> Severity -> [Severity]
$cenumFromTo :: Severity -> Severity -> [Severity]
enumFromThen :: Severity -> Severity -> [Severity]
$cenumFromThen :: Severity -> Severity -> [Severity]
enumFrom :: Severity -> [Severity]
$cenumFrom :: Severity -> [Severity]
fromEnum :: Severity -> Int
$cfromEnum :: Severity -> Int
toEnum :: Int -> Severity
$ctoEnum :: Int -> Severity
pred :: Severity -> Severity
$cpred :: Severity -> Severity
succ :: Severity -> Severity
$csucc :: Severity -> Severity
Enum, Severity
forall a. a -> a -> Bounded a
maxBound :: Severity
$cmaxBound :: Severity
minBound :: Severity
$cminBound :: Severity
Bounded, Ord Severity
(Severity, Severity) -> Int
(Severity, Severity) -> [Severity]
(Severity, Severity) -> Severity -> Bool
(Severity, Severity) -> Severity -> Int
forall a.
Ord a
-> ((a, a) -> [a])
-> ((a, a) -> a -> Int)
-> ((a, a) -> a -> Int)
-> ((a, a) -> a -> Bool)
-> ((a, a) -> Int)
-> ((a, a) -> Int)
-> Ix a
unsafeRangeSize :: (Severity, Severity) -> Int
$cunsafeRangeSize :: (Severity, Severity) -> Int
rangeSize :: (Severity, Severity) -> Int
$crangeSize :: (Severity, Severity) -> Int
inRange :: (Severity, Severity) -> Severity -> Bool
$cinRange :: (Severity, Severity) -> Severity -> Bool
unsafeIndex :: (Severity, Severity) -> Severity -> Int
$cunsafeIndex :: (Severity, Severity) -> Severity -> Int
index :: (Severity, Severity) -> Severity -> Int
$cindex :: (Severity, Severity) -> Severity -> Int
range :: (Severity, Severity) -> [Severity]
$crange :: (Severity, Severity) -> [Severity]
Ix)

{- $pattern
Instead of using full names of the constructors you can instead use one-letter
patterns. To do so you can import and use the pattern:

@
__import__ Colog (__pattern__ D)

example :: WithLog env Message m => m ()
example = log D "I'm using severity pattern"
@

Moreover, you could use patterns when pattern-matching on severity

@
errorToStderr :: 'Severity' -> IO ()
errorToStderr E = hputStrLn stderr "Error severity"
errorToStderr _ = putStrLn "Something else"
@
-}

pattern D, I, W, E :: Severity
pattern $bD :: Severity
$mD :: forall {r}. Severity -> ((# #) -> r) -> ((# #) -> r) -> r
D <- Debug   where D = Severity
Debug
pattern $bI :: Severity
$mI :: forall {r}. Severity -> ((# #) -> r) -> ((# #) -> r) -> r
I <- Info    where I = Severity
Info
pattern $bW :: Severity
$mW :: forall {r}. Severity -> ((# #) -> r) -> ((# #) -> r) -> r
W <- Warning where W = Severity
Warning
pattern $bE :: Severity
$mE :: forall {r}. Severity -> ((# #) -> r) -> ((# #) -> r) -> r
E <- Error   where E = Severity
Error
{-# COMPLETE D, I, W, E #-}

-- | Filters messages by the given 'Severity'.
filterBySeverity
    :: Applicative m
    => Severity
    -> (a -> Severity)
    -> LogAction m a
    -> LogAction m a
filterBySeverity :: forall (m :: * -> *) a.
Applicative m =>
Severity -> (a -> Severity) -> LogAction m a -> LogAction m a
filterBySeverity Severity
s a -> Severity
fs = forall (m :: * -> *) msg.
Applicative m =>
(msg -> Bool) -> LogAction m msg -> LogAction m msg
cfilter (\a
a -> a -> Severity
fs a
a forall a. Ord a => a -> a -> Bool
>= Severity
s)
{-# INLINE filterBySeverity #-}

-- Note: the order of the fields here is to allow the constructor to be used infix.
{-| A message tagged with a 'Severity'.
 
It is common to want to log various types of messages tagged with a severity. 
'WithSeverity' provides a standard way to do so while allowing the messages to be processed independently of the severity.

It is easy to 'cmap' over a 'LogAction m (WithSeverity a)', or to filter based on the severity.

@
logSomething :: 'LogAction' m ('WithSeverity' 'String') -> m ()
logSomething logger = logger <& "hello" \`WithSeverity\` 'Info'

cmap' :: (b -> a) -> 'LogAction' m ('WithSeverity' a) -> 'LogAction' m ('WithSeverity' b)
cmap' f action = 'cmap' ('fmap' f) action

filterBySeverity' :: ('Applicative' m) => 'Severity' -> 'LogAction' m ('WithSeverity' a) -> 'LogAction' m ('WithSeverity' a)
filterBySeverity' threshold action = 'filterBySeverity' threshold 'getSeverity' action
@

@since 0.3.1.0
-}
data WithSeverity msg = WithSeverity { forall msg. WithSeverity msg -> msg
getMsg :: msg , forall msg. WithSeverity msg -> Severity
getSeverity :: Severity }
  deriving stock (Int -> WithSeverity msg -> ShowS
forall msg. Show msg => Int -> WithSeverity msg -> ShowS
forall msg. Show msg => [WithSeverity msg] -> ShowS
forall msg. Show msg => WithSeverity msg -> String
forall a.
(Int -> a -> ShowS) -> (a -> String) -> ([a] -> ShowS) -> Show a
showList :: [WithSeverity msg] -> ShowS
$cshowList :: forall msg. Show msg => [WithSeverity msg] -> ShowS
show :: WithSeverity msg -> String
$cshow :: forall msg. Show msg => WithSeverity msg -> String
showsPrec :: Int -> WithSeverity msg -> ShowS
$cshowsPrec :: forall msg. Show msg => Int -> WithSeverity msg -> ShowS
Show, WithSeverity msg -> WithSeverity msg -> Bool
forall msg. Eq msg => WithSeverity msg -> WithSeverity msg -> Bool
forall a. (a -> a -> Bool) -> (a -> a -> Bool) -> Eq a
/= :: WithSeverity msg -> WithSeverity msg -> Bool
$c/= :: forall msg. Eq msg => WithSeverity msg -> WithSeverity msg -> Bool
== :: WithSeverity msg -> WithSeverity msg -> Bool
$c== :: forall msg. Eq msg => WithSeverity msg -> WithSeverity msg -> Bool
Eq, WithSeverity msg -> WithSeverity msg -> Bool
WithSeverity msg -> WithSeverity msg -> Ordering
forall a.
Eq a
-> (a -> a -> Ordering)
-> (a -> a -> Bool)
-> (a -> a -> Bool)
-> (a -> a -> Bool)
-> (a -> a -> Bool)
-> (a -> a -> a)
-> (a -> a -> a)
-> Ord a
forall {msg}. Ord msg => Eq (WithSeverity msg)
forall msg. Ord msg => WithSeverity msg -> WithSeverity msg -> Bool
forall msg.
Ord msg =>
WithSeverity msg -> WithSeverity msg -> Ordering
forall msg.
Ord msg =>
WithSeverity msg -> WithSeverity msg -> WithSeverity msg
min :: WithSeverity msg -> WithSeverity msg -> WithSeverity msg
$cmin :: forall msg.
Ord msg =>
WithSeverity msg -> WithSeverity msg -> WithSeverity msg
max :: WithSeverity msg -> WithSeverity msg -> WithSeverity msg
$cmax :: forall msg.
Ord msg =>
WithSeverity msg -> WithSeverity msg -> WithSeverity msg
>= :: WithSeverity msg -> WithSeverity msg -> Bool
$c>= :: forall msg. Ord msg => WithSeverity msg -> WithSeverity msg -> Bool
> :: WithSeverity msg -> WithSeverity msg -> Bool
$c> :: forall msg. Ord msg => WithSeverity msg -> WithSeverity msg -> Bool
<= :: WithSeverity msg -> WithSeverity msg -> Bool
$c<= :: forall msg. Ord msg => WithSeverity msg -> WithSeverity msg -> Bool
< :: WithSeverity msg -> WithSeverity msg -> Bool
$c< :: forall msg. Ord msg => WithSeverity msg -> WithSeverity msg -> Bool
compare :: WithSeverity msg -> WithSeverity msg -> Ordering
$ccompare :: forall msg.
Ord msg =>
WithSeverity msg -> WithSeverity msg -> Ordering
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forall a b. (a -> b) -> WithSeverity a -> WithSeverity b
forall (f :: * -> *).
(forall a b. (a -> b) -> f a -> f b)
-> (forall a b. a -> f b -> f a) -> Functor f
<$ :: forall a b. a -> WithSeverity b -> WithSeverity a
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fmap :: forall a b. (a -> b) -> WithSeverity a -> WithSeverity b
$cfmap :: forall a b. (a -> b) -> WithSeverity a -> WithSeverity b
Functor, forall a. Eq a => a -> WithSeverity a -> Bool
forall a. Num a => WithSeverity a -> a
forall a. Ord a => WithSeverity a -> a
forall m. Monoid m => WithSeverity m -> m
forall a. WithSeverity a -> Bool
forall a. WithSeverity a -> Int
forall a. WithSeverity a -> [a]
forall a. (a -> a -> a) -> WithSeverity a -> a
forall m a. Monoid m => (a -> m) -> WithSeverity a -> m
forall b a. (b -> a -> b) -> b -> WithSeverity a -> b
forall a b. (a -> b -> b) -> b -> WithSeverity a -> b
forall (t :: * -> *).
(forall m. Monoid m => t m -> m)
-> (forall m a. Monoid m => (a -> m) -> t a -> m)
-> (forall m a. Monoid m => (a -> m) -> t a -> m)
-> (forall a b. (a -> b -> b) -> b -> t a -> b)
-> (forall a b. (a -> b -> b) -> b -> t a -> b)
-> (forall b a. (b -> a -> b) -> b -> t a -> b)
-> (forall b a. (b -> a -> b) -> b -> t a -> b)
-> (forall a. (a -> a -> a) -> t a -> a)
-> (forall a. (a -> a -> a) -> t a -> a)
-> (forall a. t a -> [a])
-> (forall a. t a -> Bool)
-> (forall a. t a -> Int)
-> (forall a. Eq a => a -> t a -> Bool)
-> (forall a. Ord a => t a -> a)
-> (forall a. Ord a => t a -> a)
-> (forall a. Num a => t a -> a)
-> (forall a. Num a => t a -> a)
-> Foldable t
product :: forall a. Num a => WithSeverity a -> a
$cproduct :: forall a. Num a => WithSeverity a -> a
sum :: forall a. Num a => WithSeverity a -> a
$csum :: forall a. Num a => WithSeverity a -> a
minimum :: forall a. Ord a => WithSeverity a -> a
$cminimum :: forall a. Ord a => WithSeverity a -> a
maximum :: forall a. Ord a => WithSeverity a -> a
$cmaximum :: forall a. Ord a => WithSeverity a -> a
elem :: forall a. Eq a => a -> WithSeverity a -> Bool
$celem :: forall a. Eq a => a -> WithSeverity a -> Bool
length :: forall a. WithSeverity a -> Int
$clength :: forall a. WithSeverity a -> Int
null :: forall a. WithSeverity a -> Bool
$cnull :: forall a. WithSeverity a -> Bool
toList :: forall a. WithSeverity a -> [a]
$ctoList :: forall a. WithSeverity a -> [a]
foldl1 :: forall a. (a -> a -> a) -> WithSeverity a -> a
$cfoldl1 :: forall a. (a -> a -> a) -> WithSeverity a -> a
foldr1 :: forall a. (a -> a -> a) -> WithSeverity a -> a
$cfoldr1 :: forall a. (a -> a -> a) -> WithSeverity a -> a
foldl' :: forall b a. (b -> a -> b) -> b -> WithSeverity a -> b
$cfoldl' :: forall b a. (b -> a -> b) -> b -> WithSeverity a -> b
foldl :: forall b a. (b -> a -> b) -> b -> WithSeverity a -> b
$cfoldl :: forall b a. (b -> a -> b) -> b -> WithSeverity a -> b
foldr' :: forall a b. (a -> b -> b) -> b -> WithSeverity a -> b
$cfoldr' :: forall a b. (a -> b -> b) -> b -> WithSeverity a -> b
foldr :: forall a b. (a -> b -> b) -> b -> WithSeverity a -> b
$cfoldr :: forall a b. (a -> b -> b) -> b -> WithSeverity a -> b
foldMap' :: forall m a. Monoid m => (a -> m) -> WithSeverity a -> m
$cfoldMap' :: forall m a. Monoid m => (a -> m) -> WithSeverity a -> m
foldMap :: forall m a. Monoid m => (a -> m) -> WithSeverity a -> m
$cfoldMap :: forall m a. Monoid m => (a -> m) -> WithSeverity a -> m
fold :: forall m. Monoid m => WithSeverity m -> m
$cfold :: forall m. Monoid m => WithSeverity m -> m
Foldable, Functor WithSeverity
Foldable WithSeverity
forall (t :: * -> *).
Functor t
-> Foldable t
-> (forall (f :: * -> *) a b.
    Applicative f =>
    (a -> f b) -> t a -> f (t b))
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    Monad m =>
    (a -> m b) -> t a -> m (t b))
-> (forall (m :: * -> *) a. Monad m => t (m a) -> m (t a))
-> Traversable t
forall (m :: * -> *) a.
Monad m =>
WithSeverity (m a) -> m (WithSeverity a)
forall (f :: * -> *) a.
Applicative f =>
WithSeverity (f a) -> f (WithSeverity a)
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Monad m =>
(a -> m b) -> WithSeverity a -> m (WithSeverity b)
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Applicative f =>
(a -> f b) -> WithSeverity a -> f (WithSeverity b)
sequence :: forall (m :: * -> *) a.
Monad m =>
WithSeverity (m a) -> m (WithSeverity a)
$csequence :: forall (m :: * -> *) a.
Monad m =>
WithSeverity (m a) -> m (WithSeverity a)
mapM :: forall (m :: * -> *) a b.
Monad m =>
(a -> m b) -> WithSeverity a -> m (WithSeverity b)
$cmapM :: forall (m :: * -> *) a b.
Monad m =>
(a -> m b) -> WithSeverity a -> m (WithSeverity b)
sequenceA :: forall (f :: * -> *) a.
Applicative f =>
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$csequenceA :: forall (f :: * -> *) a.
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traverse :: forall (f :: * -> *) a b.
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$ctraverse :: forall (f :: * -> *) a b.
Applicative f =>
(a -> f b) -> WithSeverity a -> f (WithSeverity b)
Traversable)

{- | Map the given function over the severity of a 'WithSeverity'.
 
This can be useful to operate generically over the severity, for example:

@
suppressErrors :: 'LogAction' m ('WithSeverity' msg) -> 'LogAction' m ('WithSeverity' msg)
suppressErrors = 'cmap' ('mapSeverity' (\s -> if s == 'Error' then 'Warning' else s))
@

@since 0.3.1.0
-}
mapSeverity :: (Severity -> Severity) -> WithSeverity msg -> WithSeverity msg
mapSeverity :: forall msg.
(Severity -> Severity) -> WithSeverity msg -> WithSeverity msg
mapSeverity Severity -> Severity
f (WithSeverity msg
msg Severity
sev) = forall msg. msg -> Severity -> WithSeverity msg
WithSeverity msg
msg (Severity -> Severity
f Severity
sev)
{-# INLINE mapSeverity #-}