{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DeriveGeneric #-}
{-# LANGUAGE DeriveLift #-}
{-# LANGUAGE DeriveTraversable #-}
{-# LANGUAGE DerivingStrategies #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE RecordWildCards #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}

module Internal.Types where

import Data.Fix (Fix (..), foldFix)
import Data.Functor.Foldable (embed)
import qualified Data.Functor.Foldable.TH as TH
import Database.Persist.Sql hiding (In, Statement)
import Dhall hiding (embed, maybe)
import Dhall.TH
import Language.Haskell.TH.Syntax (Lift)
import RIO
import qualified RIO.Map as M
-- import RIO.State
import qualified RIO.Text as T
import RIO.Time

-------------------------------------------------------------------------------
-- YAML CONFIG
-------------------------------------------------------------------------------

makeHaskellTypesWith
  (defaultGenerateOptions {generateToDhallInstance = False})
  [ MultipleConstructors "SqlConfig" "(./dhall/Types.dhall).SqlConfig"
  , MultipleConstructors "TimeUnit" "(./dhall/Types.dhall).TimeUnit"
  , MultipleConstructors "Weekday" "(./dhall/Types.dhall).Weekday"
  , MultipleConstructors "WeekdayPat" "(./dhall/Types.dhall).WeekdayPat"
  , MultipleConstructors "MDYPat" "(./dhall/Types.dhall).MDYPat"
  , MultipleConstructors "DatePat" "(./dhall/Types.dhall).DatePat"
  , MultipleConstructors "MatchYMD" "(./dhall/Types.dhall).MatchYMD"
  , MultipleConstructors "MatchDate" "(./dhall/Types.dhall).MatchDate"
  , MultipleConstructors "SplitNum" "(./dhall/Types.dhall).SplitNum"
  , MultipleConstructors "Bucket" "(./dhall/Types.dhall).Bucket"
  , SingleConstructor "Currency" "Currency" "(./dhall/Types.dhall).Currency"
  , SingleConstructor "Gregorian" "Gregorian" "(./dhall/Types.dhall).Gregorian"
  , SingleConstructor "GregorianM" "GregorianM" "(./dhall/Types.dhall).GregorianM"
  , SingleConstructor "Interval" "Interval" "(./dhall/Types.dhall).Interval"
  , SingleConstructor "Global" "Global" "(./dhall/Types.dhall).Global"
  , SingleConstructor "RepeatPat" "RepeatPat" "(./dhall/Types.dhall).RepeatPat"
  , SingleConstructor "ModPat" "ModPat" "(./dhall/Types.dhall).ModPat.Type"
  , SingleConstructor "CronPat" "CronPat" "(./dhall/Types.dhall).CronPat.Type"
  , SingleConstructor "Decimal" "D" "(./dhall/Types.dhall).Decimal"
  , SingleConstructor "TxOpts" "TxOpts" "(./dhall/Types.dhall).TxOpts.Type"
  , SingleConstructor "MatchVal" "MatchVal" "(./dhall/Types.dhall).MatchVal.Type"
  , SingleConstructor "Manual" "Manual" "(./dhall/Types.dhall).Manual"
  , SingleConstructor "Tax" "Tax" "(./dhall/Types.dhall).Tax"
  ]

-------------------------------------------------------------------------------
-- account tree

data AccountTree
  = Placeholder T.Text T.Text [AccountTree]
  | Account T.Text T.Text

TH.makeBaseFunctor ''AccountTree

deriving instance Generic (AccountTreeF a)

deriving instance FromDhall a => FromDhall (AccountTreeF a)

data AccountRoot_ a = AccountRoot_
  { arAssets :: ![a]
  , arEquity :: ![a]
  , arExpenses :: ![a]
  , arIncome :: ![a]
  , arLiabilities :: ![a]
  }
  deriving (Generic)

type AccountRootF = AccountRoot_ (Fix AccountTreeF)

deriving instance FromDhall AccountRootF

type AccountRoot = AccountRoot_ AccountTree

-------------------------------------------------------------------------------
-- curencies

deriving instance Eq Currency

deriving instance Lift Currency

deriving instance Hashable Currency

type CurID = T.Text

-------------------------------------------------------------------------------
-- DHALL CONFIG
-------------------------------------------------------------------------------

data Config_ a = Config_
  { global :: !Global
  , budget :: !Budget
  , currencies :: ![Currency]
  , statements :: ![Statement]
  , accounts :: !a
  , sqlConfig :: !SqlConfig
  }
  deriving (Generic)

type ConfigF = Config_ AccountRootF

type Config = Config_ AccountRoot

unfix :: ConfigF -> Config
unfix c@Config_ {accounts = a} = c {accounts = a'}
  where
    a' =
      AccountRoot_
        { arAssets = unfixTree arAssets
        , arEquity = unfixTree arEquity
        , arExpenses = unfixTree arExpenses
        , arIncome = unfixTree arIncome
        , arLiabilities = unfixTree arLiabilities
        }
    unfixTree f = foldFix embed <$> f a

instance FromDhall a => FromDhall (Config_ a)

-------------------------------------------------------------------------------
-- accounts

type AcntID = T.Text

--------------------------------------------------------------------------------
-- Time Patterns (for assigning when budget events will happen)

deriving instance Eq TimeUnit

deriving instance Hashable TimeUnit

deriving instance Eq Weekday

deriving instance Hashable Weekday

deriving instance Eq WeekdayPat

deriving instance Hashable WeekdayPat

deriving instance Show RepeatPat

deriving instance Eq RepeatPat

deriving instance Hashable RepeatPat

deriving instance Show MDYPat

deriving instance Eq MDYPat

deriving instance Hashable MDYPat

deriving instance Eq Gregorian

deriving instance Show Gregorian

deriving instance Hashable Gregorian

deriving instance Eq GregorianM

deriving instance Show GregorianM

deriving instance Hashable GregorianM

-- Dhall.TH rearranges my fields :(
instance Ord Gregorian where
  compare
    Gregorian {gYear = y, gMonth = m, gDay = d}
    Gregorian {gYear = y', gMonth = m', gDay = d'} =
      compare y y'
        <> compare m m'
        <> compare d d'

instance Ord GregorianM where
  compare
    GregorianM {gmYear = y, gmMonth = m}
    GregorianM {gmYear = y', gmMonth = m'} = compare y y' <> compare m m'

deriving instance Eq ModPat

deriving instance Hashable ModPat

deriving instance Eq CronPat

deriving instance Hashable CronPat

deriving instance Eq DatePat

deriving instance Hashable DatePat

--------------------------------------------------------------------------------
-- Budget (projecting into the future)

data Income = Income
  { incGross :: !Decimal
  , incCurrency :: !CurID
  , incWhen :: !DatePat
  , incAccount :: !AcntID
  , incPretax :: ![Allocation Decimal]
  , incTaxes :: ![Tax]
  , incPosttax :: ![Allocation (Maybe Decimal)]
  }
  deriving (Eq, Hashable, Generic, FromDhall)

data Budget = Budget
  { income :: ![Income]
  , expenses :: ![Expense]
  }
  deriving (Generic, FromDhall)

deriving instance Eq Tax

deriving instance Hashable Tax

data Amount v = Amount
  { amtValue :: !v
  , amtDesc :: !T.Text
  }
  deriving (Functor, Foldable, Traversable, Eq, Hashable, Generic, FromDhall)

data Allocation v = Allocation
  { alloPath :: !AcntID
  , alloBucket :: !Bucket
  , alloAmts :: ![Amount v]
  , alloCurrency :: !CurID
  }
  deriving (Eq, Hashable, Generic, FromDhall)

deriving instance Eq Bucket

deriving instance Hashable Bucket

deriving instance Show Bucket

data TimeAmount = TimeAmount
  { taWhen :: !DatePat
  , taAmt :: Amount Decimal
  }
  deriving (Eq, Hashable, Generic, FromDhall)

data Expense = Expense
  { expFrom :: !AcntID
  , expTo :: !AcntID
  , expBucket :: !Bucket
  , expAmounts :: ![TimeAmount]
  , expCurrency :: !CurID
  }
  deriving (Eq, Hashable, Generic, FromDhall)

--------------------------------------------------------------------------------
-- Statements (data from the past)

data Statement
  = StmtManual Manual
  | StmtImport Import
  deriving (Generic, FromDhall)

deriving instance Hashable Manual

data Split a v c = Split
  { sAcnt :: !a
  , sValue :: !v
  , sCurrency :: !c
  , sComment :: !T.Text
  }
  deriving (Eq, Generic, Hashable, Show, FromDhall)

type ExpSplit = Split SplitAcnt (Maybe SplitNum) SplitCur

data Tx s = Tx
  { txDescr :: !T.Text
  , txDate :: !Day
  , txTags :: ![T.Text]
  , txSplits :: ![s]
  }
  deriving (Generic)

type ExpTx = Tx ExpSplit

instance FromDhall ExpTx

data Import = Import
  { impPaths :: ![FilePath]
  , impMatches :: ![Match]
  , impDelim :: !Word
  , impTxOpts :: !TxOpts
  , impSkipLines :: !Natural
  }
  deriving (Hashable, Generic, FromDhall)

deriving instance Eq MatchVal

deriving instance Hashable MatchVal

deriving instance Show MatchVal

deriving instance Eq MatchYMD

deriving instance Hashable MatchYMD

deriving instance Show MatchYMD

deriving instance Eq MatchDate

deriving instance Hashable MatchDate

deriving instance Show MatchDate

-- TODO this just looks silly...but not sure how to simplify it
instance Ord MatchYMD where
  compare (Y y) (Y y') = compare y y'
  compare (YM g) (YM g') = compare g g'
  compare (YMD g) (YMD g') = compare g g'
  compare (Y y) (YM g) = compare y (gmYear g) <> LT
  compare (Y y) (YMD g) = compare y (gYear g) <> LT
  compare (YM g) (Y y') = compare (gmYear g) y' <> GT
  compare (YMD g) (Y y') = compare (gYear g) y' <> GT
  compare (YM g) (YMD g') = compare g (gregM g') <> LT
  compare (YMD g) (YM g') = compare (gregM g) g' <> GT

gregM :: Gregorian -> GregorianM
gregM Gregorian {gYear = y, gMonth = m} =
  GregorianM {gmYear = y, gmMonth = m}

instance Ord MatchDate where
  compare (On d) (On d') = compare d d'
  compare (In d r) (In d' r') = compare d d' <> compare r r'
  compare (On d) (In d' _) = compare d d' <> LT
  compare (In d _) (On d') = compare d d' <> GT

deriving instance Eq SplitNum

deriving instance Hashable SplitNum

deriving instance Show SplitNum

-- | the value of a field in split (text version)
-- can either be a raw (constant) value, a lookup from the record, or a map
-- between the lookup and some other value
data SplitText t
  = ConstT !t
  | LookupT !T.Text
  | MapT (FieldMap T.Text t)
  | Map2T (FieldMap (T.Text, T.Text) t)
  deriving (Eq, Generic, Hashable, Show, FromDhall)

type SplitCur = SplitText CurID

type SplitAcnt = SplitText AcntID

data Field k v = Field
  { fKey :: !k
  , fVal :: !v
  }
  deriving (Show, Eq, Hashable, Generic, FromDhall)

type FieldMap k v = Field k (M.Map k v)

data MatchOther
  = Desc (Field T.Text T.Text)
  | Val (Field T.Text MatchVal)
  deriving (Show, Eq, Hashable, Generic, FromDhall)

data ToTx = ToTx
  { ttCurrency :: !SplitCur
  , ttPath :: !SplitAcnt
  , ttSplit :: ![ExpSplit]
  }
  deriving (Eq, Generic, Hashable, Show, FromDhall)

data Match = Match
  { mDate :: Maybe MatchDate
  , mVal :: MatchVal
  , mDesc :: Maybe Text
  , mOther :: ![MatchOther]
  , mTx :: Maybe ToTx
  , mTimes :: Maybe Natural
  , mPriority :: !Integer
  }
  deriving (Eq, Generic, Hashable, Show, FromDhall)

deriving instance Eq TxOpts

deriving instance Hashable TxOpts

deriving instance Show TxOpts

--------------------------------------------------------------------------------
-- Specialized dhall types

deriving instance Eq Decimal

deriving instance Hashable Decimal

deriving instance Show Decimal

--------------------------------------------------------------------------------
-- database cache types

data ConfigHashes = ConfigHashes
  { chIncome :: ![Int]
  , chExpense :: ![Int]
  , chManual :: ![Int]
  , chImport :: ![Int]
  }

data ConfigType = CTIncome | CTExpense | CTManual | CTImport
  deriving (Eq, Show, Read, Enum)

instance PersistFieldSql ConfigType where
  sqlType _ = SqlString

instance PersistField ConfigType where
  toPersistValue = PersistText . T.pack . show

  -- TODO these error messages *might* be good enough?
  fromPersistValue (PersistText v) =
    maybe (Left $ "could not parse: " <> v) Right $ readMaybe $ T.unpack v
  fromPersistValue _ = Left "wrong type"

-------------------------------------------------------------------------------
-- misc

data AcntType
  = AssetT
  | EquityT
  | ExpenseT
  | IncomeT
  | LiabilityT
  deriving (Show, Eq, Ord, Lift, Hashable, Generic, Read, FromDhall)

atName :: AcntType -> T.Text
atName AssetT = "asset"
atName EquityT = "equity"
atName ExpenseT = "expense"
atName IncomeT = "income"
atName LiabilityT = "liability"

data AcntPath = AcntPath
  { apType :: !AcntType
  , apChildren :: ![T.Text]
  }
  deriving (Eq, Ord, Show, Lift, Hashable, Generic, Read, FromDhall)

data TxRecord = TxRecord
  { trDate :: !Day
  , trAmount :: !Rational
  , trDesc :: !T.Text
  , trOther :: M.Map T.Text T.Text
  , trFile :: FilePath
  }
  deriving (Show, Eq, Ord)

type Bounds = (Day, Day)

type MaybeBounds = (Maybe Day, Maybe Day)

data Keyed a = Keyed
  { kKey :: !Int64
  , kVal :: !a
  }
  deriving (Eq, Show, Functor)

data Tree a = Branch !a ![Tree a] | Leaf !a deriving (Show)

data AcntSign = Credit | Debit
  deriving (Show)

sign2Int :: AcntSign -> Int
sign2Int Debit = 1
sign2Int Credit = 1

accountSign :: AcntType -> AcntSign
accountSign AssetT = Debit
accountSign ExpenseT = Debit
accountSign IncomeT = Credit
accountSign LiabilityT = Credit
accountSign EquityT = Credit

type RawAmount = Amount (Maybe Rational)

type BalAmount = Amount Rational

type RawAllocation = Allocation (Maybe Rational)

type BalAllocation = Allocation Rational

type RawSplit = Split AcntID (Maybe Rational) CurID

type BalSplit = Split AcntID Rational CurID

type RawTx = Tx RawSplit

type BalTx = Tx BalSplit

data MatchRes a = MatchPass a | MatchFail | MatchSkip

data BalanceType = TooFewSplits | NotOneBlank deriving (Show)

data LookupField = AccountField | CurrencyField | OtherField deriving (Show)

data AllocationSuberr
  = NoAllocations
  | ExceededTotal
  | MissingBlank
  | TooManyBlanks
  deriving (Show)

-- data ConversionSubError = Malformed |  deriving (Show)

data InsertError
  = RegexError T.Text
  | YearError Natural
  | ConversionError T.Text
  | LookupError LookupField T.Text
  | BalanceError BalanceType CurID [RawSplit]
  | AllocationError AllocationSuberr
  | StatementError [TxRecord] [Match]
  deriving (Show)

newtype InsertException = InsertException [InsertError] deriving (Show)

instance Exception InsertException

type EitherErr = Either InsertError

type EitherErrs = Either [InsertError]

-- type StateErr = State [InsertError]

-- runErrors :: StateErr a -> Either [InsertError] a
-- runErrors x = case runState x [] of
--   (y, []) -> Right y
--   (_, es) -> Left es