{- This file is part of Vervis.
 -
 - Written in 2016, 2019, 2020, 2022 by fr33domlover <fr33domlover@riseup.net>.
 -
 - ♡ Copying is an act of love. Please copy, reuse and share.
 -
 - The author(s) have dedicated all copyright and related and neighboring
 - rights to this software to the public domain worldwide. This software is
 - distributed without any warranty.
 -
 - You should have received a copy of the CC0 Public Domain Dedication along
 - with this software. If not, see
 - <http://creativecommons.org/publicdomain/zero/1.0/>.
 -}

module Vervis.Form.Ticket
    ( fedUriField

    , NewTicket (..)
    , NewCloth (..)
    , newTicketForm
    , newClothForm
    --, editTicketContentForm
    --, assignTicketForm
    --, claimRequestForm
    , ticketFilterForm
    --, ticketDepForm
    )
where

import Control.Applicative (liftA2, liftA3)
import Control.Monad.IO.Class (liftIO)
import Control.Monad.Trans.Class (lift)
import Data.Bool
import Data.Maybe
import Data.Text (Text)
import Data.Time.Calendar (Day (..))
import Data.Time.Clock (getCurrentTime, UTCTime (..))
import Data.Traversable
import Database.Persist
import Yesod.Core
import Yesod.Form
import Yesod.Persist.Core (runDB)

import qualified Data.Text as T

import Development.PatchMediaType
import Network.FedURI
import Web.Text

import Vervis.FedURI
import Vervis.Foundation (App, Form, Handler)
import Vervis.Model
import Vervis.Model.Ticket
import Vervis.Model.Workflow
import Vervis.Ticket
import Vervis.TicketFilter (TicketFilter (..))

fedUriField
    :: (Monad m, RenderMessage (HandlerSite m) FormMessage) => Field m FedURI
fedUriField = Field
    { fieldParse = parseHelper $ \ t ->
        case parseObjURI t of
            Left e  -> Left $ MsgInvalidUrl $ T.pack e <> ": " <> t
            Right u -> Right u
    , fieldView = \theId name attrs val isReq ->
        [whamlet|<input ##{theId} name=#{name} *{attrs} type=url :isReq:required value=#{either id renderObjURI val}>|]
    , fieldEnctype = UrlEncoded
    }
--TODO use custom fields to ensure uniqueness or other constraints?

data NewTicket = NewTicket
    { ntTitle   :: Text
    , ntDesc    :: PandocMarkdown
    --, ntTParams :: [(WorkflowFieldId, Text)]
    --, ntEParams :: [(WorkflowFieldId, WorkflowEnumCtorId)]
    --, ntCParams :: [WorkflowFieldId]
    }

data NewCloth = NewCloth
    { ncTitle   :: Text
    , ncDesc    :: PandocMarkdown
    , ncTarget  :: Maybe Text
    , ncOrigin  :: Maybe (FedURI, Maybe Text)
    , ncPatch   :: Maybe (PatchMediaType, FileInfo)
    }

{-
fieldSettings :: Text -> Bool -> FieldSettings App
fieldSettings name req =
    fieldSettingsLabel $
    if req
        then name `T.snoc` '*'
        else name

tfield :: Entity WorkflowField -> AForm Handler (Maybe (WorkflowFieldId, Text))
tfield (Entity fid f) =
    let sets = fieldSettings (workflowFieldName f) (workflowFieldRequired f)
    in  fmap (fid, ) <$>
        if workflowFieldRequired f
            then Just <$> areq textField sets Nothing
            else aopt textField sets Nothing

efield
    :: Entity WorkflowField
    -> Maybe (AForm Handler (Maybe (WorkflowFieldId, WorkflowEnumCtorId)))
efield (Entity fid f) =
    case workflowFieldEnm f of
        Nothing -> Nothing
        Just eid -> Just $
            let sets =
                    fieldSettings
                        (workflowFieldName f)
                        (workflowFieldRequired f)
                sel =
                    selectField $
                    optionsPersistKey
                        [WorkflowEnumCtorEnum ==. eid]
                        []
                        workflowEnumCtorName
            in  fmap (fid, ) <$>
                if workflowFieldRequired f
                    then Just <$> areq sel sets Nothing
                    else aopt sel sets Nothing

cfield :: Entity WorkflowField -> AForm Handler (Maybe WorkflowFieldId)
cfield (Entity fid f) =
    let sets = fieldSettings (workflowFieldName f) (workflowFieldRequired f)
        mkval False = Nothing
        mkval True  = Just fid
    in  if workflowFieldRequired f
            then mkval <$> areq checkBoxField sets Nothing
            else mkval . fromMaybe False <$> aopt checkBoxField sets Nothing
-}

newTicketForm :: WorkflowId -> Form NewTicket
newTicketForm wid html = do
    {-
    (tfs, efs, cfs) <- lift $ runDB $ do
        tfs <- selectList
            [ WorkflowFieldWorkflow  ==. wid
            , WorkflowFieldType      ==. WFTText
            , WorkflowFieldEnm       ==. Nothing
            , WorkflowFieldFilterNew ==. True
            ]
            []
        efs <- selectList
            [ WorkflowFieldWorkflow  ==. wid
            , WorkflowFieldType      ==. WFTEnum
            , WorkflowFieldFilterNew ==. True
            ]
            []
        cfs <- selectList
            [ WorkflowFieldWorkflow  ==. wid
            , WorkflowFieldType      ==. WFTClass
            , WorkflowFieldEnm       ==. Nothing
            , WorkflowFieldFilterNew ==. True
            ]
            []
        return (tfs, efs, cfs)
    -}
    flip renderDivs html $ NewTicket
        <$> (areq textField "Title*" Nothing)
        <*> ( pandocMarkdownFromText . T.filter (/= '\r') . unTextarea <$>
              areq textareaField "Description (Markdown)*" Nothing
            )
        -- <*> (catMaybes <$> traverse tfield tfs)
        -- <*> (fmap catMaybes $ sequenceA $ mapMaybe efield efs)
        -- <*> (catMaybes <$> traverse cfield cfs)

newClothForm :: Form NewCloth
newClothForm = renderDivs $ mk
    <$> (areq textField "Title*" Nothing)
    <*> ( pandocMarkdownFromText . T.filter (/= '\r') . unTextarea <$>
            areq textareaField "Description (Markdown)*" Nothing
        )
    <*> aopt textField "Target branch" Nothing
    <*> aopt fedUriField "Origin repo" Nothing
    <*> aopt textField "Origin branch" Nothing
    <*> aopt (selectFieldList typeList) "Patch type" Nothing
    <*> aopt fileField "Patch file" Nothing
    where
    typeList :: [(Text, PatchMediaType)]
    typeList =
        [ ("Darcs", PatchMediaTypeDarcs)
        , ("Git"  , PatchMediaTypeGit)
        ]
    mk title desc targetBranch originRepo originBranch typ file =
        NewCloth
            title desc targetBranch
            ((,originBranch) <$> originRepo) ((,) <$> typ <*> file)

{-
editTicketContentAForm :: Ticket -> AForm Handler Ticket
editTicketContentAForm ticket = Ticket
    <$> pure (ticketNumber ticket)
    <*> pure (ticketCreated ticket)
    <*> ( sanitizeBalance <$>
          areq textField "Title*" (Just $ ticketTitle ticket)
        )
    <*> ( maybe "" (T.filter (/= '\r') . unTextarea) <$>
          aopt
            textareaField
            "Description (Markdown)"
            (Just $ Just $ Textarea $
                T.intercalate "\r\n" $ T.lines $ ticketSource ticket
            )
        )
    <*> pure (ticketDescription ticket)
    <*> pure (ticketAssignee ticket)
    <*> pure (ticketStatus ticket)

tEditField
    :: TicketTextParam
    -> AForm Handler (Maybe TicketParamTextId, Maybe (WorkflowFieldId, Text))
tEditField (TicketTextParam (WorkflowFieldSummary fid _ name req _ _) mv) =
    let sets = fieldSettings name req
    in  (ttpvId <$> mv, ) . fmap (fid, ) <$>
        if req
            then Just <$> areq textField sets (ttpvVal <$> mv)
            else aopt textField sets (Just . ttpvVal <$> mv)

eEditField
    :: TicketEnumParam
    -> AForm
        Handler
        ( Maybe TicketParamEnumId
        , Maybe (WorkflowFieldId, WorkflowEnumCtorId)
        )
eEditField (TicketEnumParam (WorkflowFieldSummary fid _ name req _ _) e mv) =
    let sets = fieldSettings name req
        sel =
            selectField $
            optionsPersistKey
                [WorkflowEnumCtorEnum ==. wesId e]
                []
                workflowEnumCtorName
    in  (tepvId <$> mv, ) . fmap (fid, ) <$>
        if req
            then Just <$> areq sel sets (tepvVal <$> mv)
            else aopt sel sets (Just . tepvVal <$> mv)

cEditField
    :: TicketClassParam
    -> AForm Handler (Maybe TicketParamClassId, Maybe WorkflowFieldId)
cEditField (TicketClassParam (WorkflowFieldSummary fid _ name req _ _) mv) =
    let sets = fieldSettings name req
    in  (mv,) . bool Nothing (Just fid) <$> areq checkBoxField sets (Just $ isJust mv)

editableField :: Ticket -> WorkflowFieldSummary -> Bool
editableField t f =
    not (wfsConstant f) &&
    case ticketStatus t of
        TSNew    -> wffNew    $ wfsFilter f
        TSTodo   -> wffTodo   $ wfsFilter f
        TSClosed -> wffClosed $ wfsFilter f

editTicketContentForm
    :: TicketId
    -> Ticket
    -> WorkflowId
    -> Form
        ( Ticket
        , [ ( Maybe TicketParamTextId
            , Maybe (WorkflowFieldId, Text)
            )
          ]
        , [ ( Maybe TicketParamEnumId
            , Maybe (WorkflowFieldId, WorkflowEnumCtorId)
            )
          ]
        , [ ( Maybe TicketParamClassId
            , Maybe WorkflowFieldId
            )
          ]
        )
editTicketContentForm tid t wid html = do
    (tfs, efs, cfs) <-
        lift $ runDB $
        liftA3 (,,)
            ( filter (editableField t . ttpField) <$>
                getTicketTextParams tid wid
            )
            ( filter (editableField t . tepField) <$>
                getTicketEnumParams tid wid
            )
            ( filter (editableField t . tcpField) <$>
                getTicketClasses tid wid
            )
    flip renderDivs html $
        (,,,)
            <$> editTicketContentAForm t
            <*> traverse tEditField tfs
            <*> traverse eEditField efs
            <*> traverse cEditField cfs
-}

{-
assignTicketAForm :: PersonId -> ProjectId -> AForm Handler PersonId
assignTicketAForm pid jid =
    areq (selectAssigneeFromProject pid jid) "Assignee*" Nothing

assignTicketForm :: PersonId -> ProjectId -> Form PersonId
assignTicketForm pid jid = renderDivs $ assignTicketAForm pid jid
-}

{-
claimRequestAForm :: AForm Handler Text
claimRequestAForm = unTextarea <$> areq textareaField "Message*" Nothing

claimRequestForm :: Form Text
claimRequestForm = renderDivs claimRequestAForm
-}

ticketFilterAForm :: AForm Handler TicketFilter
ticketFilterAForm = TicketFilter
    <$> areq checkBoxField "Open"   (Just True)
    <*> areq checkBoxField "Closed" (Just False)

ticketFilterForm :: Form TicketFilter
ticketFilterForm = renderDivs ticketFilterAForm

{-
ticketDepAForm :: ProjectId -> TicketId -> AForm Handler TicketId
ticketDepAForm jid tid = areq (selectTicketDep jid tid) "Dependency" Nothing

ticketDepForm :: ProjectId -> TicketId -> Form TicketId
ticketDepForm jid tid = renderDivs $ ticketDepAForm jid tid
-}