module Agda.Interaction.JSONTop
    ( jsonREPL
    ) where

import Control.Monad          ( (<=<), forM )
import Control.Monad.IO.Class ( MonadIO(..) )

import Data.ByteString.Lazy (ByteString)
import qualified Data.ByteString.Lazy.Char8 as BS
import qualified Data.Text as T
import qualified Data.Set as Set

import Agda.Interaction.AgdaTop
import Agda.Interaction.Base
  (CommandState(..), CurrentFile(..), ComputeMode(..), Rewrite(..), OutputForm(..), OutputConstraint(..))
import qualified Agda.Interaction.BasicOps as B
import Agda.Interaction.EmacsTop
import Agda.Interaction.JSON
import Agda.Interaction.Response as R
import Agda.Interaction.Highlighting.JSON
import Agda.Syntax.Abstract.Pretty (prettyATop)
import Agda.Syntax.Common
import qualified Agda.Syntax.Concrete as C
import Agda.Syntax.Concrete.Name (NameInScope(..), Name)
import Agda.Syntax.Internal (telToList, Dom'(..), Dom, MetaId(..), ProblemId(..), Blocker(..), alwaysUnblock)
import Agda.Syntax.Position (Range, rangeIntervals, Interval'(..), Position'(..), noRange)
import Agda.VersionCommit

import Agda.TypeChecking.Errors (getAllWarningsOfTCErr)
import Agda.TypeChecking.Monad (Comparison(..), inTopContext, TCM, TCErr, TCWarning, NamedMeta(..), withInteractionId)
import Agda.TypeChecking.Monad.MetaVars (getInteractionRange, getMetaRange, withMetaId)
import Agda.TypeChecking.Pretty (PrettyTCM(..), prettyTCM)
-- borrowed from EmacsTop, for temporarily serialising stuff
import Agda.TypeChecking.Pretty.Warning (filterTCWarnings)
import Agda.TypeChecking.Warnings (WarningsAndNonFatalErrors(..))
import Agda.Utils.Pretty (Pretty(..))
import qualified Agda.Utils.Pretty as P
import Agda.Utils.Time (CPUTime(..))

--------------------------------------------------------------------------------

-- | 'jsonREPL' is a interpreter like 'mimicGHCi', but outputs JSON-encoded strings.
--
--   'jsonREPL' reads Haskell values (that starts from 'IOTCM' ...) from stdin,
--   interprets them, and outputs JSON-encoded strings. into stdout.

jsonREPL :: TCM () -> TCM ()
jsonREPL = repl (liftIO . BS.putStrLn <=< jsonifyResponse) "JSON> "

instance EncodeTCM NameInScope where
instance ToJSON NameInScope where
  toJSON InScope    = toJSON True
  toJSON NotInScope = toJSON False

instance EncodeTCM Status where
instance ToJSON Status where
  toJSON status = object
    [ "showImplicitArguments"   .= sShowImplicitArguments status
    , "showIrrelevantArguments" .= sShowIrrelevantArguments status
    , "checked"                 .= sChecked status
    ]

instance EncodeTCM CommandState where
instance ToJSON CommandState where
  toJSON commandState = object
    [ "interactionPoints" .= theInteractionPoints commandState
    , "currentFile"       .= theCurrentFile commandState
    -- more?
    ]

instance EncodeTCM CurrentFile where
instance ToJSON CurrentFile where
  toJSON (CurrentFile path _ time) = toJSON (path, time)  -- backwards compat.

instance EncodeTCM ResponseContextEntry where
  encodeTCM entry = obj
    [ "originalName" @= encodePretty (respOrigName entry)
    , "reifiedName"  @= encodePretty (respReifName entry)
    , "binding"      #= prettyATop (unArg (respType entry))
    , "inScope"      @= respInScope entry
    ]

instance EncodeTCM (Position' ()) where
instance ToJSON (Position' ()) where
  toJSON p = object
    [ "pos"  .= toJSON (posPos p)
    , "line" .= toJSON (posLine p)
    , "col"  .= toJSON (posCol p)
    ]

instance EncodeTCM Range where
instance ToJSON Range where
  toJSON = toJSON . map prettyInterval . rangeIntervals
    where prettyInterval i = object [ "start" .= iStart i, "end" .= iEnd i ]

instance EncodeTCM ProblemId where
instance EncodeTCM MetaId    where

instance ToJSON ProblemId where toJSON (ProblemId i) = toJSON i

instance ToJSON ModuleNameHash where
  toJSON (ModuleNameHash h) = toJSON h

instance ToJSON MetaId where
  toJSON m = object
    [ "id"     .= toJSON (metaId m)
    , "module" .= toJSON (metaModule m)
    ]

instance EncodeTCM InteractionId where
  encodeTCM ii@(InteractionId i) = obj
    [ "id"    @= toJSON i
    , "range" #= intervalsTCM
    ]
    where
      intervalsTCM = toJSON <$> getInteractionRange ii
instance ToJSON InteractionId where
  toJSON (InteractionId i) = toJSON i

instance EncodeTCM NamedMeta where
  encodeTCM m = obj
    [ "name"  #= nameTCM
    , "range" #= intervalsTCM
    ]
    where
      nameTCM = encodeShow <$> withMetaId (nmid m) (prettyATop m)
      intervalsTCM = toJSON <$> getMetaRange (nmid m)

instance EncodeTCM GiveResult where
instance ToJSON GiveResult where
  toJSON (Give_String s) = object [ "str" .= s ]
  toJSON Give_Paren   = object [ "paren" .= True ]
  toJSON Give_NoParen = object [ "paren" .= False ]

instance EncodeTCM MakeCaseVariant where
instance ToJSON MakeCaseVariant where
  toJSON R.Function = String "Function"
  toJSON R.ExtendedLambda = String "ExtendedLambda"

encodePretty :: Pretty a => a -> Value
encodePretty = encodeShow . pretty

encodeShow :: Show a => a -> Value
encodeShow = String . T.pack . show

encodePrettyTCM :: PrettyTCM a => a -> TCM Value
encodePrettyTCM = (encodeShow <$>) . prettyTCM

instance EncodeTCM Rewrite where
instance ToJSON Rewrite where toJSON = encodeShow

instance EncodeTCM CPUTime where
instance ToJSON CPUTime where toJSON = encodePretty

instance EncodeTCM ComputeMode where
instance ToJSON ComputeMode where toJSON = encodeShow

encodeOCCmp :: (a -> TCM Value)
  -> Comparison -> a -> a -> T.Text
  -> TCM Value
encodeOCCmp f c i j k = kind k
  [ "comparison"     @= encodeShow c
  , "constraintObjs" #= traverse f [i, j]
  ]

  -- Goals
encodeOC :: (a -> TCM Value)
  -> (b -> TCM Value)
  -> OutputConstraint b a
  -> TCM Value
encodeOC f encPrettyTCM = \case
 OfType i a -> kind "OfType"
  [ "constraintObj" #= f i
  , "type"          #= encPrettyTCM a
  ]
 CmpInType c a i j -> kind "CmpInType"
  [ "comparison"     @= encodeShow c
  , "type"           #= encPrettyTCM a
  , "constraintObjs" #= traverse f [i, j]
  ]
 CmpElim ps a is js -> kind "CmpElim"
  [ "polarities"     @= map encodeShow ps
  , "type"           #= encPrettyTCM a
  , "constraintObjs" #= traverse (traverse f) [is, js]
  ]
 JustType a -> kind "JustType"
  [ "constraintObj"  #= f a
  ]
 JustSort a -> kind "JustSort"
  [ "constraintObj"  #= f a
  ]
 CmpTypes  c i j -> encodeOCCmp f c i j "CmpTypes"
 CmpLevels c i j -> encodeOCCmp f c i j "CmpLevels"
 CmpTeles  c i j -> encodeOCCmp f c i j "CmpTeles"
 CmpSorts  c i j -> encodeOCCmp f c i j "CmpSorts"
 Assign i a -> kind "Assign"
  [ "constraintObj"  #= f i
  , "value"          #= encPrettyTCM a
  ]
 TypedAssign i v t -> kind "TypedAssign"
  [ "constraintObj"  #= f i
  , "value"          #= encPrettyTCM v
  , "type"           #= encPrettyTCM t
  ]
 PostponedCheckArgs i es t0 t1 -> kind "PostponedCheckArgs"
  [ "constraintObj"  #= f i
  , "ofType"         #= encPrettyTCM t0
  , "arguments"      #= forM es encPrettyTCM
  , "type"           #= encPrettyTCM t1
  ]
 IsEmptyType a -> kind "IsEmptyType"
  [ "type"           #= encPrettyTCM a
  ]
 SizeLtSat a -> kind "SizeLtSat"
  [ "type"           #= encPrettyTCM a
  ]
 FindInstanceOF i t cs -> kind "FindInstanceOF"
  [ "constraintObj"  #= f i
  , "candidates"     #= forM cs encodeKVPairs
  , "type"           #= encPrettyTCM t
  ]
  where encodeKVPairs (_, v, t) = obj -- TODO: encode kind
          [ "value"  #= encPrettyTCM v
          , "type"   #= encPrettyTCM t
          ]
 PTSInstance a b -> kind "PTSInstance"
  [ "constraintObjs" #= traverse f [a, b]
  ]
 PostponedCheckFunDef name a err -> kind "PostponedCheckFunDef"
  [ "name"           @= encodePretty name
  , "type"           #= encPrettyTCM a
  , "error"          #= encodeTCM err
  ]
 CheckLock t lk -> kind "CheckLock"
  [ "head"           #= f t
  , "lock"           #= f lk
  ]
 UsableAtMod mod t -> kind "UsableAtMod"
  [ "mod"           @= encodePretty mod
  , "term"          #= f t
  ]

encodeNamedPretty :: PrettyTCM a => (Name, a) -> TCM Value
encodeNamedPretty (name, a) = obj
  [ "name" @= encodePretty name
  , "term" #= encodePrettyTCM a
  ]

instance EncodeTCM (OutputForm C.Expr C.Expr) where
  encodeTCM (OutputForm range problems unblock oc) = obj
    [ "range"      @= range
    , "problems"   @= problems
    , "unblocker"  @= unblock
    , "constraint" #= encodeOC (pure . encodePretty) (pure . encodePretty) oc
    ]

instance EncodeTCM Blocker where
  encodeTCM (UnblockOnMeta x)    = kind "UnblockOnMeta" [ "meta" @= x ]
  encodeTCM (UnblockOnProblem p) = kind "UnblockOnProblem" [ "id" @= p ]
  encodeTCM (UnblockOnAll us)    = kind "UnblockOnAll" [ "blockers" @= Set.toList us ]
  encodeTCM (UnblockOnAny us)    = kind "UnblockOnAny" [ "blockers" @= Set.toList us ]

instance EncodeTCM DisplayInfo where
  encodeTCM (Info_CompilationOk backend wes) = kind "CompilationOk"
    [ "backend"           @= encodePretty backend
    , "warnings"          #= encodeTCM (filterTCWarnings (tcWarnings wes))
    , "errors"            #= encodeTCM (filterTCWarnings (nonFatalErrors wes))
    ]
  encodeTCM (Info_Constraints constraints) = kind "Constraints"
    [ "constraints"       #= forM constraints encodeTCM
    ]
  encodeTCM (Info_AllGoalsWarnings (vis, invis) wes) = kind "AllGoalsWarnings"
    [ "visibleGoals"      #= forM vis (\i -> withInteractionId (B.outputFormId $ OutputForm noRange [] alwaysUnblock i) $ encodeOC encodeTCM encodePrettyTCM i)
    , "invisibleGoals"    #= forM invis (encodeOC encodeTCM encodePrettyTCM)
    , "warnings"          #= encodeTCM (filterTCWarnings (tcWarnings wes))
    , "errors"            #= encodeTCM (filterTCWarnings (nonFatalErrors wes))
    ]
  encodeTCM (Info_Time time) = kind "Time"
    [ "time"              @= time
    ]
  encodeTCM (Info_Error err) = encodeTCM err
  encodeTCM Info_Intro_NotFound = kind "IntroNotFound" []
  encodeTCM (Info_Intro_ConstructorUnknown introductions) = kind "IntroConstructorUnknown"
    [ "constructors"      @= map toJSON introductions
    ]
  encodeTCM (Info_Auto info) = kind "Auto"
    [ "info"              @= toJSON info
    ]
  encodeTCM (Info_ModuleContents names tele contents) = kind "ModuleContents"
    [ "contents"          #= forM contents encodeNamedPretty
    , "telescope"         #= forM (telToList tele) encodeDomType
    , "names"             @= map encodePretty names
    ]
    where
      encodeDomType :: PrettyTCM a => Dom (ArgName, a) -> TCM Value
      encodeDomType dom = obj
        [ "dom"       #= encodePrettyTCM (unDom dom)
        , "name"      @= fmap encodePretty (bareNameOf dom)
        , "finite"    @= toJSON (domFinite dom)
        , "cohesion"  @= encodeShow (modCohesion . argInfoModality $ domInfo dom)
        , "relevance" @= encodeShow (modRelevance . argInfoModality $ domInfo dom)
        , "hiding"    @= case argInfoHiding $ domInfo dom of
          Instance o -> show o
          o -> show o
        ]
  encodeTCM (Info_SearchAbout results search) = kind "SearchAbout"
    [ "results"           #= forM results encodeNamedPretty
    , "search"            @= toJSON search
    ]
  encodeTCM (Info_WhyInScope thing path v xs ms) = kind "WhyInScope"
    [ "thing"             @= thing
    , "filepath"          @= toJSON path
    -- use Emacs message first
    , "message"           #= explainWhyInScope thing path v xs ms
    ]
  encodeTCM (Info_NormalForm commandState computeMode time expr) = kind "NormalForm"
    [ "commandState"      @= commandState
    , "computeMode"       @= computeMode
    , "time"              @= time
    , "expr"              #= encodePrettyTCM expr
    ]
  encodeTCM (Info_InferredType commandState time expr) = kind "InferredType"
    [ "commandState"      @= commandState
    , "time"              @= time
    , "expr"              #= encodePrettyTCM expr
    ]
  encodeTCM (Info_Context ii ctx) = kind "Context"
    [ "interactionPoint"  @= ii
    , "context"           @= ctx
    ]
  encodeTCM Info_Version = kind "Version"
    [ "version"           @= (versionWithCommitInfo :: String)
    ]
  encodeTCM (Info_GoalSpecific ii info) = kind "GoalSpecific"
    [ "interactionPoint"  @= ii
    , "goalInfo"          #= withInteractionId ii (encodeGoalSpecific ii info)
    ]

instance EncodeTCM GoalTypeAux where
  encodeTCM GoalOnly = kind "GoalOnly" []
  encodeTCM (GoalAndHave expr) = kind "GoalAndHave"
    [ "expr" #= encodePrettyTCM expr ]
  encodeTCM (GoalAndElaboration term) = kind "GoalAndElaboration"
    [ "term" #= encodePrettyTCM term ]

encodeGoalSpecific :: InteractionId -> GoalDisplayInfo -> TCM Value
encodeGoalSpecific ii = go
  where
  go (Goal_HelperFunction helperType) = kind "HelperFunction"
    [ "signature"   #= inTopContext (prettyATop helperType)
    ]
  go (Goal_NormalForm computeMode expr) = kind "NormalForm"
    [ "computeMode" @= computeMode
    , "expr"        #= B.showComputed computeMode expr
    ]
  go (Goal_GoalType rewrite goalType entries boundary outputForms) = kind "GoalType"
    [ "rewrite"     @= rewrite
    , "typeAux"     @= goalType
    , "type"        #= prettyTypeOfMeta rewrite ii
    , "entries"     @= entries
    , "boundary"    @= map encodePretty boundary
    , "outputForms" @= map encodePretty outputForms
    ]
  go (Goal_CurrentGoal rewrite) = kind "CurrentGoal"
    [ "rewrite"     @= rewrite
    , "type"        #= prettyTypeOfMeta rewrite ii
    ]
  go (Goal_InferredType expr) = kind "InferredType"
    [ "expr"        #= prettyATop expr
    ]

instance EncodeTCM Info_Error where
  encodeTCM (Info_GenericError err) = kind "Error"
    [ "warnings"          #= (getAllWarningsOfTCErr err
                            >>= encodeTCM . filterTCWarnings)
    , "error"             #= encodeTCM err
    ]
  encodeTCM err = kind "Error"
    [ "warnings"          @= ([] :: [String])
    , "error"             #= obj
      [ "message"           #= showInfoError err
      ]
    ]

instance EncodeTCM TCErr where
  encodeTCM err = obj
    [ "message"     #= encodePrettyTCM err
    ]

instance EncodeTCM TCWarning where
  encodeTCM w = obj
    [ "message"     #= (P.render <$> prettyTCM w)
    ]

instance EncodeTCM Response where
  encodeTCM (Resp_HighlightingInfo info remove method modFile) =
    liftIO $ jsonifyHighlightingInfo info remove method modFile
  encodeTCM (Resp_DisplayInfo info) = kind "DisplayInfo"
    [ "info"          @= info
    ]
  encodeTCM (Resp_ClearHighlighting tokenBased) = kind "ClearHighlighting"
    [ "tokenBased"    @= tokenBased
    ]
  encodeTCM Resp_DoneAborting = kind "DoneAborting" []
  encodeTCM Resp_DoneExiting = kind "DoneExiting" []
  encodeTCM Resp_ClearRunningInfo = kind "ClearRunningInfo" []
  encodeTCM (Resp_RunningInfo debugLevel msg) = kind "RunningInfo"
    [ "debugLevel"    @= debugLevel
    , "message"       @= msg
    ]
  encodeTCM (Resp_Status status) = kind "Status"
    [ "status"        @= status
    ]
  encodeTCM (Resp_JumpToError filepath position) = kind "JumpToError"
    [ "filepath"      @= filepath
    , "position"      @= position
    ]
  encodeTCM (Resp_InteractionPoints interactionPoints) = kind "InteractionPoints"
    [ "interactionPoints" @= interactionPoints
    ]
  encodeTCM (Resp_GiveAction i giveResult) = kind "GiveAction"
    [ "interactionPoint"  @= i
    , "giveResult"        @= giveResult
    ]
  encodeTCM (Resp_MakeCase id variant clauses) = kind "MakeCase"
    [ "interactionPoint"  @= id
    , "variant"           @= variant
    , "clauses"           @= clauses
    ]
  encodeTCM (Resp_SolveAll solutions) = kind "SolveAll"
    [ "solutions"     @= map encodeSolution solutions
    ]
    where
      encodeSolution (i, expr) = object
        [ "interactionPoint"  .= i
        , "expression"        .= P.prettyShow expr
        ]

-- | Convert Response to an JSON value for interactive editor frontends.
jsonifyResponse :: Response -> TCM ByteString
jsonifyResponse = pure . encode <=< encodeTCM
