{- This file is part of Vervis.
 -
 - Written in 2016, 2018, 2019 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.Migration
    ( migrateDB
    )
where

import Prelude

import Control.Monad (unless)
import Control.Monad.IO.Class (MonadIO)
import Control.Monad.Trans.Class (lift)
import Control.Monad.Trans.Reader (ReaderT, runReaderT)
import Data.ByteString (ByteString)
import Data.Default.Class
import Data.Default.Instances.ByteString ()
import Data.Foldable (traverse_, for_)
import Data.Maybe (fromMaybe, listToMaybe)
import Data.Proxy
import Data.Text (Text)
import Data.Text.Encoding (encodeUtf8)
import Data.Time.Calendar (Day (..))
import Data.Time.Clock (UTCTime (..))
import Database.Persist
import Database.Persist.BackendDataType (backendDataType, PersistDefault (..))
import Database.Persist.Migration
import Database.Persist.Schema (SchemaT, Migration)
import Database.Persist.Schema.Types
import Database.Persist.Schema.PostgreSQL (schemaBackend)
import Database.Persist.Sql (SqlBackend, toSqlKey)
--import Text.Email.QuasiQuotation (email
import Text.Email.Validate (unsafeEmailAddress)
import Web.PathPieces (toPathPiece)

import qualified Database.Esqueleto as E
import qualified Database.Persist.Schema as U (addEntity, unsetFieldDefault)

import Vervis.Migration.Model
import Vervis.Model
import Vervis.Model.Ident
import Vervis.Model.Workflow

instance PersistDefault ByteString where
    pdef = def

type Apply m = SchemaT SqlBackend m ()
type Mig m   = Migration SqlBackend m

defaultTime :: UTCTime
defaultTime = UTCTime (ModifiedJulianDay 0) 0

withPrepare :: Monad m => Mig m -> Apply m -> Mig m
withPrepare (validate, apply) prepare = (validate, prepare >> apply)

changes :: MonadIO m => [Mig m]
changes =
    [ -- 1
      addEntities model_2016_08_04
      -- 2
    , unchecked $ U.unsetFieldDefault "Sharer" "created"
      -- 3
    , unchecked $ U.unsetFieldDefault "Project" "nextTicket"
      -- 4
    , unchecked $ U.unsetFieldDefault "Repo" "vcs"
      -- 5
    , unchecked $ U.unsetFieldDefault "Repo" "mainBranch"
      -- 6
    , removeField "Ticket" "done"
      -- 7
    , addFieldPrimRequired "Ticket" ("TSNew" :: Text) "status"
      -- 8
    , addEntities model_2016_09_01_just_workflow
      -- 9
    , addEntities model_2016_09_01_rest
      -- 10
    , let key = fromBackendKey defaultBackendKey :: Key Workflow2016
      in  withPrepare
            (addFieldRefRequired "Project"
                (toBackendKey key)
                "workflow"
                "Workflow"
            ) $ do
                noProjects <- lift $
                    null <$> selectKeysList [] [LimitTo 1 :: SelectOpt Project]
                unless noProjects $ lift $ do
                    msid <-
                        listToMaybe <$>
                        selectKeysList [] [Asc SharerId, LimitTo 1]
                    for_ msid $ \ sid -> do
                        let ident = text2wfl "dummy"
                            w = Workflow2016 sid ident Nothing Nothing
                        insertKey key w
      -- 11
    , addFieldPrimRequired "Workflow" ("WSSharer" :: Text) "scope"
      -- 12
    , unsetFieldPrimMaybe "Person" "hash" ("" :: Text)
      -- 13
    , changeFieldTypePrimRequiredFreeHs "Person" "hash" encodeUtf8
      -- 14
    --, unsetFieldPrimMaybe "Person" "email" [email|noreply@no.such.email|]
    , unsetFieldPrimMaybe "Person" "email" $
        unsafeEmailAddress "noreply" "no.such.email"
      -- 15
    , addFieldPrimRequired "Person" True "verified"
      -- 16
    , addFieldPrimRequired "Person" ("" :: Text) "verifiedKey"
      -- 17
    , addFieldPrimRequired "Person" ("" :: Text) "resetPassphraseKey"
      -- 18
    , renameField "Person" "hash" "passphraseHash"
      -- 19
    , renameField "Person" "resetPassphraseKey" "resetPassKey"
      -- 20
    , addFieldPrimRequired "Person" defaultTime "verifiedKeyCreated"
      -- 21
    , addFieldPrimRequired "Person" defaultTime "resetPassKeyCreated"
      -- 22
    , addUnique "Person" $ Unique "UniquePersonEmail" ["email"]
      -- 23
    , renameField "ProjectCollabAnon" "repo" "project"
      -- 24
    , renameField "ProjectCollabUser" "repo" "project"
      -- 25
    , addFieldPrimRequired "Person" ("" :: Text) "about"
      -- 26
    , setFieldMaybe "ProjectCollab" "role"
      -- 27
    , removeField "RepoCollab" "role"
      -- 28
    , addFieldRefOptional "RepoCollab" Nothing "role" "ProjectRole"
      -- 29
    , removeEntity "RepoCollabAnon"
      -- 30
    , removeEntity "RepoCollabUser"
      -- 31
    , addFieldRefOptional "Repo" Nothing "collabUser" "ProjectRole"
      -- 32
    , addFieldRefOptional "Repo" Nothing "collabAnon" "ProjectRole"
      -- 33
    , addFieldRefOptional "Project" Nothing "collabUser" "ProjectRole"
      -- 34
    , addFieldRefOptional "Project" Nothing "collabAnon" "ProjectRole"
      -- 35
    , unchecked $ lift $ do
        l <- E.select $ E.from $ \ (j `E.LeftOuterJoin`
                                   jcu `E.LeftOuterJoin`
                                   jca) -> do
            E.on $
                E.just (j E.^. Project2018Id) E.==.
                jca E.?. ProjectCollabAnon2018Project
            E.on $
                E.just (j E.^. Project2018Id) E.==.
                jcu E.?. ProjectCollabUser2018Project
            E.where_ $ E.not_ $
                E.isNothing (jcu E.?. ProjectCollabUser2018Project) E.&&.
                E.isNothing (jca E.?. ProjectCollabAnon2018Project)
            return
                ( j E.^. Project2018Id
                , jca E.?. ProjectCollabAnon2018Role
                , jcu E.?. ProjectCollabUser2018Role
                )
        for_ l $ \ (E.Value jid, E.Value malid, E.Value mulid) ->
            update jid
                [ Project2018CollabAnon =. malid
                , Project2018CollabUser =. mulid
                ]
      -- 36
    , removeEntity "ProjectCollabAnon"
      -- 37
    , removeEntity "ProjectCollabUser"
      -- 38
    , removeEntity "RepoAccess"
      -- 39
    , removeEntity "RepoRoleInherit"
      -- 40
    , removeEntity "RepoRole"
      -- 41
    , addEntities model_2019_02_03_verifkey
      -- 42
    , unchecked $ lift $ do
        deleteWhere ([] :: [Filter (VerifKeySharedUsage2019Generic SqlBackend)])
        deleteWhere ([] :: [Filter (VerifKey2019Generic SqlBackend)])
      -- 43
    , removeUnique "Message" "UniqueMessage"
      -- 44
    , removeField "Message" "number"
      -- 45
    , removeField "Discussion" "nextMessage"
    ]

migrateDB :: MonadIO m => ReaderT SqlBackend m (Either Text (Int, Int))
migrateDB =
    let f cs = fmap (, length cs) <$> runMigrations schemaBackend 1 cs
    in  f changes