  {-|

Most data types are defined here to avoid import cycles.
Here is an overview of the hledger data model:

> Journal                  -- a journal is read from one or more data files. It contains..
>  [Transaction]           -- journal transactions (aka entries), which have date, cleared status, code, description and..
>   [Posting]              -- multiple account postings, which have account name and amount
>  [MarketPrice]           -- historical market prices for commodities
>
> Ledger                   -- a ledger is derived from a journal, by applying a filter specification and doing some further processing. It contains..
>  Journal                 -- a filtered copy of the original journal, containing only the transactions and postings we are interested in
>  [Account]               -- all accounts, in tree order beginning with a "root" account", with their balances and sub/parent accounts

For more detailed documentation on each type, see the corresponding modules.

-}

-- {-# LANGUAGE DeriveAnyClass #-}  -- https://hackage.haskell.org/package/deepseq-1.4.4.0/docs/Control-DeepSeq.html#v:rnf
{-# LANGUAGE CPP        #-}
{-# LANGUAGE DeriveFunctor        #-}
{-# LANGUAGE DeriveGeneric        #-}
{-# LANGUAGE FlexibleInstances    #-}
{-# LANGUAGE OverloadedStrings    #-}
{-# LANGUAGE RecordWildCards      #-}
{-# LANGUAGE StandaloneDeriving   #-}
{-# LANGUAGE StrictData           #-}

module Hledger.Data.Types (
  module Hledger.Data.Types,
#if MIN_VERSION_time(1,11,0)
  Year
#endif
)
where

import GHC.Generics (Generic)
import Control.DeepSeq (NFData(..))
import Data.Bifunctor (first)
import Data.Decimal (Decimal, DecimalRaw(..))
import Data.Default (Default(..))
import Data.Functor (($>))
import Data.List (intercalate, sortBy)
--XXX https://hackage.haskell.org/package/containers/docs/Data-Map.html
--Note: You should use Data.Map.Strict instead of this module if:
--You will eventually need all the values stored.
--The stored values don't represent large virtual data structures to be lazily computed.
import Data.Map qualified as M
import Data.Ord (comparing)
import Data.Semigroup (Min(..))
import Data.Text (Text)
import Data.Text qualified as T
import Data.Time.Calendar (Day)
import Data.Time.Clock.POSIX (POSIXTime)
import Data.Time.LocalTime (LocalTime)
import Data.Word (Word8)
import Text.Blaze (ToMarkup(..))
import Text.Megaparsec (SourcePos(SourcePos), mkPos)

import Hledger.Utils.Regex


-- synonyms for various date-related scalars
#if MIN_VERSION_time(1,11,0)
import Data.Time.Calendar (Year)
#else
type Year = Integer
#endif
type Month = Int     -- 1-12
type Quarter = Int   -- 1-4
type YearWeek = Int  -- 1-52
type MonthWeek = Int -- 1-5
type YearDay = Int   -- 1-366
type MonthDay = Int  -- 1-31
type WeekDay = Int   -- 1-7

-- | A possibly incomplete year-month-day date provided by the user, to be
-- interpreted as either a date or a date span depending on context. Missing
-- parts "on the left" will be filled from the provided reference date, e.g. if
-- the year and month are missing, the reference date's year and month are used.
-- Missing parts "on the right" are assumed, when interpreting as a date, to be
-- 1, (e.g. if the year and month are present but the day is missing, it means
-- first day of that month); or when interpreting as a date span, to be a
-- wildcard (so it would mean all days of that month). See the `smartdate`
-- parser for more examples.
--
-- Or, one of the standard periods and a numeric offset relative to the reference date:
-- (last|this|next) (day|week|month|quarter|year), where "this" means the period
-- containing the reference date.
--
-- Or, (last|this|next) weekdayname, where "this" "next".
--
-- Or, (last|this|next) monthname, where "this" means the previous 1st if in that month,
-- otherwise the start of the next occurrence of that month.
--
data SmartDate
  = SmartCompleteDate Day
  | SmartAssumeStart Year (Maybe Month)         -- XXX improve these constructor names
  | SmartFromReference (Maybe Month) MonthDay   --
  | SmartMonth Month
  | SmartRelative Integer SmartInterval
  | SmartRelativeMonth Ordering Month           -- ^ EQ will be treated like GT
  | SmartRelativeWeekDay Ordering WeekDay
  deriving (Show)

data SmartInterval = Day | Week | Month | Quarter | Year deriving (Show)

data WhichDate = PrimaryDate | SecondaryDate deriving (Eq,Show)

-- | A date which is either exact or flexible.
-- Flexible dates are allowed to be adjusted in certain situations.
data EFDay = Exact Day | Flex Day deriving (Eq,Generic,Show)

-- EFDay's Ord instance treats them like ordinary dates, ignoring exact/flexible.
instance Ord EFDay where compare d1 d2 = compare (fromEFDay d1) (fromEFDay d2)

-- instance Ord EFDay where compare = maCompare

fromEFDay :: EFDay -> Day
fromEFDay (Exact d) = d
fromEFDay (Flex  d) = d

modifyEFDay :: (Day -> Day) -> EFDay -> EFDay
modifyEFDay f (Exact d) = Exact $ f d
modifyEFDay f (Flex  d) = Flex  $ f d

-- | A possibly open-ended span of time, from an optional inclusive start date
-- to an optional exclusive end date. Each date can be either exact or flexible.
-- An "exact date span" is a Datepan with exact start and end dates.
data DateSpan = DateSpan (Maybe EFDay) (Maybe EFDay) deriving (Eq,Ord,Generic)

instance Default DateSpan where def = DateSpan Nothing Nothing

-- Some common report subperiods, both finite and open-ended.
-- A higher-level abstraction than DateSpan.
data Period =
    DayPeriod Day
  | WeekPeriod Day
  | MonthPeriod Year Month
  | QuarterPeriod Year Quarter
  | YearPeriod Year
  | PeriodBetween Day Day
  | PeriodFrom Day
  | PeriodTo Day
  | PeriodAll
  deriving (Eq,Ord,Show,Generic)

instance Default Period where def = PeriodAll

-- All the kinds of report interval allowed in a period expression
-- (to generate periodic reports or periodic transactions).
data Interval =
    NoInterval
  | Days Int
  | Weeks Int
  | Months Int
  | Quarters Int
  | Years Int
  | NthWeekdayOfMonth Int Int  -- n,              weekday 1-7
  | MonthDay Int               -- 1-31
  | MonthAndDay Int Int        -- month 1-12,     monthday 1-31
  | DaysOfWeek [Int]           -- [weekday 1-7]
  deriving (Eq,Show,Ord,Generic)

instance Default Interval where def = NoInterval

type Payee = Text

type AccountName = Text

-- A specification indicating how to depth-limit
data DepthSpec = DepthSpec {
  dsFlatDepth    :: Maybe Int,
  dsRegexpDepths :: [(Regexp, Int)]
  } deriving (Eq,Show)

-- Semigroup instance consider all regular expressions, but take the minimum of the simple flat depths
instance Semigroup DepthSpec where
    DepthSpec d1 l1 <> DepthSpec d2 l2 = DepthSpec (getMin <$> (Min <$> d1) <> (Min <$> d2)) (l1 ++ l2)

instance Monoid DepthSpec where
    mempty = DepthSpec Nothing []

data AccountType =
    Asset
  | Liability
  | Equity
  | Revenue
  | Expense
  | Cash            -- ^ a subtype of Asset - liquid assets to show in cashflow report
  | Conversion      -- ^ a subtype of Equity - account with which to balance commodity conversions
  | Gain            -- ^ a subtype of Revenue - realised capital gains/losses
  | UnrealisedGain  -- ^ a subtype of Equity - accumulated unrealised capital gains/losses (used by hledger 2)
  deriving (Eq,Ord,Generic)

instance Show AccountType where
  show Asset          = "A"
  show Liability      = "L"
  show Equity         = "E"
  show Revenue        = "R"
  show Expense        = "X"
  show Cash           = "C"
  show Conversion     = "V"
  show Gain           = "G"
  show UnrealisedGain = "U"

isBalanceSheetAccountType :: AccountType -> Bool
isBalanceSheetAccountType t = t `elem` [
  Asset,
  Liability,
  Equity,
  Cash,
  Conversion,
  UnrealisedGain
  ]

isIncomeStatementAccountType :: AccountType -> Bool
isIncomeStatementAccountType t = t `elem` [
  Revenue,
  Expense,
  Gain
  ]

-- | Check whether the first argument is a subtype of the second: either equal
-- or one of the defined subtypes.
isAccountSubtypeOf :: AccountType -> AccountType -> Bool
isAccountSubtypeOf Asset          Asset          = True
isAccountSubtypeOf Liability      Liability      = True
isAccountSubtypeOf Equity         Equity         = True
isAccountSubtypeOf Revenue        Revenue        = True
isAccountSubtypeOf Expense        Expense        = True
isAccountSubtypeOf Cash           Cash           = True
isAccountSubtypeOf Cash           Asset          = True
isAccountSubtypeOf Conversion     Conversion     = True
isAccountSubtypeOf Conversion     Equity         = True
isAccountSubtypeOf Gain           Gain           = True
isAccountSubtypeOf Gain           Revenue        = True
isAccountSubtypeOf UnrealisedGain UnrealisedGain = True
isAccountSubtypeOf UnrealisedGain Equity         = True
isAccountSubtypeOf _              _              = False

-- not worth the trouble, letters defined in accountdirectivep for now
--instance Read AccountType
--  where
--    readsPrec _ ('A' : xs) = [(Asset,     xs)]
--    readsPrec _ ('L' : xs) = [(Liability, xs)]
--    readsPrec _ ('E' : xs) = [(Equity,    xs)]
--    readsPrec _ ('R' : xs) = [(Revenue,   xs)]
--    readsPrec _ ('X' : xs) = [(Expense,   xs)]
--    readsPrec _ _ = []

data AccountAlias = BasicAlias AccountName AccountName
                  | RegexAlias Regexp Replacement
  deriving (Eq, Read, Show, Ord, Generic)

data Side = L | R deriving (Eq,Show,Read,Ord,Generic)

-- | One of the decimal marks we support: either period or comma.
type DecimalMark = Char

isDecimalMark :: Char -> Bool
isDecimalMark c = c == '.' || c == ','

-- | The basic numeric type used in amounts.
type Quantity = Decimal
-- The following is for hledger-web, and requires blaze-markup.
-- Doing it here avoids needing a matching flag on the hledger-web package.
instance ToMarkup Quantity
 where
   toMarkup = toMarkup . show
deriving instance Generic (DecimalRaw a)

-- | An amount's per-unit or total cost/selling price in another
-- commodity, as recorded in the journal entry eg with @ or @@.
-- "Cost", formerly AKA "transaction price". The amount is always positive.
data AmountCost = UnitCost !Amount | TotalCost !Amount
  deriving (Eq,Ord,Generic,Show)

-- | Display styles for amounts - things which can be detected during parsing, such as
-- commodity side and spacing, digit group marks, decimal mark, number of decimal digits etc.
-- Every "Amount" has an AmountStyle.
-- After amounts are parsed from the input, for each "Commodity" a standard style is inferred
-- and then used when displaying amounts in that commodity.
-- Related to "AmountFormat" but higher level.
--
-- See also:
-- - hledger manual > Commodity styles
-- - hledger manual > Amounts
-- - hledger manual > Commodity display style
data AmountStyle = AmountStyle {
  ascommodityside   :: !Side,                     -- ^ show the symbol on the left or the right ?
  ascommodityspaced :: !Bool,                     -- ^ show a space between symbol and quantity ?
  asdigitgroups     :: !(Maybe DigitGroupStyle),  -- ^ show the integer part with these digit group marks, or not
  asdecimalmark     :: !(Maybe Char),             -- ^ show this character (should be . or ,) as decimal mark, or use the default (.)
  asprecision       :: !AmountPrecision,          -- ^ "display precision" - show this number of digits after the decimal point
  asrounding        :: !Rounding                  -- ^ "rounding strategy" - kept here for convenience, for now:
                                                  --   when displaying an amount, it is ignored,
                                                  --   but when applying this style to another amount, it determines 
                                                  --   how hard we should try to adjust that amount's display precision.
} deriving (Eq,Ord,Read,Generic)

instance Show AmountStyle where
  show AmountStyle{..} = unwords
    [ "AmountStylePP"
    , show ascommodityside
    , show ascommodityspaced
    , show asdigitgroups
    , show asdecimalmark
    , show asprecision
    , show asrounding
    ]

-- | The "display precision" for a hledger amount, by which we mean
-- the number of decimal digits to display to the right of the decimal mark.
data AmountPrecision =
    Precision !Word8    -- ^ show this many decimal digits (0..255)
  | NaturalPrecision    -- ^ show all significant decimal digits stored internally
  deriving (Eq,Ord,Read,Show,Generic)

-- | "Rounding strategy" - how to apply an AmountStyle's display precision
-- to a posting amount (and its cost, if any). 
-- Mainly used to customise print's output, with --round=none|soft|hard|all.
data Rounding =
    NoRounding    -- ^ keep display precisions unchanged in amt and cost
  | SoftRounding  -- ^ do soft rounding of amt and cost amounts (show more or fewer decimal zeros to approximate the target precision, but don't hide significant digits)
  | HardRounding  -- ^ do hard rounding of amt (use the exact target precision, possibly hiding significant digits), and soft rounding of cost
  | AllRounding   -- ^ do hard rounding of amt and cost
  deriving (Eq,Ord,Read,Show,Generic)

-- | A style for displaying digit groups in the integer part of a
-- floating point number. It consists of the character used to
-- separate groups (comma or period, whichever is not used as decimal
-- point), and the size of each group, starting with the one nearest
-- the decimal point. The last group size is assumed to repeat. Eg,
-- comma between thousands is DigitGroups ',' [3].
data DigitGroupStyle = DigitGroups !Char ![Word8]
  deriving (Eq,Ord,Read,Show,Generic)

type CommoditySymbol = Text

data Commodity = Commodity {
  csymbol  :: CommoditySymbol,
  cformat  :: Maybe AmountStyle,
  ccomment :: Text,              -- ^ any comment lines following the commodity directive
  ctags    :: [Tag]              -- ^ tags extracted from the comment, if any
  } deriving (Show,Eq,Generic) --,Ord)

-- | The cost basis of an individual lot - some quantity of an asset acquired at a given date and time.
-- This can represent a definite cost basis, which must have a cost and date; the label is optional.
-- Or it can represent a cost basis matcher for selecting lots.
-- Note: cost is always stored as a per-unit cost, even if the user specified total cost with {{}}.
data CostBasis = CostBasis {
  cbCost  :: !(Maybe Amount),    -- ^ nominal acquisition cost (per-unit)
  cbDate  :: !(Maybe Day),       -- ^ nominal acquisition date
  cbLabel :: !(Maybe Text)       -- ^ a short label to ensure uniqueness, correct intra-day order, or memorability, if needed
} deriving (Show,Eq,Generic,Ord)

data Amount = Amount {
  acommodity  :: !CommoditySymbol,     -- commodity symbol, or special value "AUTO"
  aquantity   :: !Quantity,            -- numeric quantity, or zero in case of "AUTO"
  astyle      :: !AmountStyle,
  acost       :: !(Maybe AmountCost),    -- ^ transacted exchange rate - the unit or total cost, in another commodity, used for this amount within its transaction
  acostbasis  :: !(Maybe CostBasis)    -- ^ the cost basis of an investment lot represented by this amount. Or, a matcher to select such a lot from the available lots.
} deriving (Eq,Ord,Generic,Show)

-- | Types with this class have one or more amounts,
-- which can have display styles applied to them.
class HasAmounts a where
  styleAmounts :: M.Map CommoditySymbol AmountStyle -> a -> a

instance HasAmounts a =>
  HasAmounts [a]
  where styleAmounts styles = map (styleAmounts styles)

instance (HasAmounts a, HasAmounts b) =>
  HasAmounts (a,b)
  where styleAmounts styles (aa,bb) = (styleAmounts styles aa, styleAmounts styles bb)

instance HasAmounts a =>
  HasAmounts (Maybe a)
  where styleAmounts styles = fmap (styleAmounts styles)


newtype MixedAmount = Mixed (M.Map MixedAmountKey Amount) deriving (Generic,Show)

instance Eq  MixedAmount where a == b  = maCompare a b == EQ
instance Ord MixedAmount where compare = maCompare

-- | Compare two MixedAmounts, substituting 0 for the quantity of any missing
-- commodities in either.
maCompare :: MixedAmount -> MixedAmount -> Ordering
maCompare (Mixed a) (Mixed b) = go (M.toList a) (M.toList b)
  where
    go xss@((kx,x):xs) yss@((ky,y):ys) = case compare kx ky of
                 EQ -> compareQuantities (Just x) (Just y) <> go xs ys
                 LT -> compareQuantities (Just x) Nothing  <> go xs yss
                 GT -> compareQuantities Nothing  (Just y) <> go xss ys
    go ((_,x):xs) [] = compareQuantities (Just x) Nothing  <> go xs []
    go [] ((_,y):ys) = compareQuantities Nothing  (Just y) <> go [] ys
    go []         [] = EQ
    compareQuantities = comparing (maybe 0 aquantity) <> comparing (maybe 0 totalcost)
    totalcost x = case acost x of
                        Just (TotalCost p) -> aquantity p
                        _                   -> 0

-- | Stores the CommoditySymbol of the Amount, along with the CommoditySymbol of
-- the cost, and its unit cost if being used.
data MixedAmountKey
  = MixedAmountKeyNoCost   !CommoditySymbol
  | MixedAmountKeyTotalCost !CommoditySymbol !CommoditySymbol
  | MixedAmountKeyUnitCost  !CommoditySymbol !CommoditySymbol !Quantity
  deriving (Eq,Generic,Show)

-- | We don't auto-derive the Ord instance because it would give an undesired ordering.
-- We want the keys to be sorted lexicographically:
-- (1) By the primary commodity of the amount.
-- (2) By the commodity of the cost, with no cost being first.
-- (3) By the unit cost, from most negative to most positive, with total costs
-- before unit costs.
-- For example, we would like the ordering to give
-- MixedAmountKeyNoCost "X" < MixedAmountKeyTotalCost "X" "Z" < MixedAmountKeyNoCost "Y"
instance Ord MixedAmountKey where
  compare = comparing commodity <> comparing pCommodity <> comparing pCost
    where
      commodity (MixedAmountKeyNoCost    c)     = c
      commodity (MixedAmountKeyTotalCost c _)   = c
      commodity (MixedAmountKeyUnitCost  c _ _) = c

      pCommodity (MixedAmountKeyNoCost    _)      = Nothing
      pCommodity (MixedAmountKeyTotalCost _ pc)   = Just pc
      pCommodity (MixedAmountKeyUnitCost  _ pc _) = Just pc

      pCost (MixedAmountKeyNoCost    _)     = Nothing
      pCost (MixedAmountKeyTotalCost _ _)   = Nothing
      pCost (MixedAmountKeyUnitCost  _ _ q) = Just q

data PostingType = RegularPosting | VirtualPosting | BalancedVirtualPosting
                   deriving (Eq,Show,Generic)

type TagName = Text
type TagValue = Text
type Tag = (TagName, TagValue)  -- ^ A tag name and (possibly empty) value.
type HiddenTag = Tag            -- ^ A tag whose name begins with _.
type DateTag = (TagName, Day)

-- | Add the _ prefix to a normal visible tag's name, making it a hidden tag.
toHiddenTag :: Tag -> HiddenTag
toHiddenTag = first toHiddenTagName

-- | Drop the _ prefix from a hidden tag's name, making it a normal visible tag.
toVisibleTag :: HiddenTag -> Tag
toVisibleTag = first toVisibleTagName

-- | Does this tag name begin with the hidden tag prefix (_) ?
isHiddenTagName :: TagName -> Bool
isHiddenTagName t =
  case T.uncons t of
    Just ('_',_) -> True
    _ -> False

-- | Add the _ prefix to a normal visible tag's name, making it a hidden tag.
toHiddenTagName :: TagName -> TagName
toHiddenTagName = T.cons '_'

-- | Drop the _ prefix from a hidden tag's name, making it a normal visible tag.
toVisibleTagName :: TagName -> TagName
toVisibleTagName = T.drop 1

-- | The status of a transaction or posting, recorded with a status mark
-- (nothing, !, or *). What these mean is ultimately user defined.
data Status = Unmarked | Pending | Cleared
  deriving (Eq,Ord,Bounded,Enum,Generic)

instance Show Status where -- custom show.. bad idea.. don't do it..
  show Unmarked = ""
  show Pending   = "!"
  show Cleared   = "*"

nullsourcepos :: SourcePos
nullsourcepos = SourcePos "" (mkPos 1) (mkPos 1)

nullsourcepospair :: (SourcePos, SourcePos)
nullsourcepospair = (SourcePos "" (mkPos 1) (mkPos 1), SourcePos "" (mkPos 2) (mkPos 1))

-- | A balance assertion is a declaration about an account's expected balance
-- at a certain point (posting date and parse order). They provide additional
-- error checking and readability to a journal file.
--
-- A balance assignments is an instruction to hledger to adjust an
-- account's balance to a certain amount at a certain point.
--
-- The 'BalanceAssertion' type is used for representing both of these.
--
-- hledger supports multiple kinds of balance assertions/assignments,
-- which differ in whether they refer to a single commodity or all commodities,
-- and the (subaccount-)inclusive or exclusive account balance.
--
data BalanceAssertion = BalanceAssertion {
      baamount    :: Amount,    -- ^ the expected balance in a particular commodity
      batotal     :: Bool,      -- ^ disallow additional non-asserted commodities ?
      bainclusive :: Bool,      -- ^ include subaccounts when calculating the actual balance ?
      baposition  :: SourcePos  -- ^ the assertion's file position, for error reporting
    } deriving (Eq,Generic,Show)

data Posting = Posting {
      pdate             :: Maybe Day,         -- ^ this posting's date, if different from the transaction's
      pdate2            :: Maybe Day,         -- ^ this posting's secondary date, if different from the transaction's
      pstatus           :: Status,
      paccount          :: AccountName,
      pamount           :: MixedAmount,
      pcomment          :: Text,              -- ^ this posting's comment lines, as a single non-indented multi-line string
      ptype             :: PostingType,
      ptags             :: [Tag],                   -- ^ tag names and values, extracted from the posting comment 
                                                    --   and (after finalisation) the posting account's directive if any
      pbalanceassertion :: Maybe BalanceAssertion,  -- ^ an expected balance in the account after this posting,
                                                    --   in a single commodity, excluding subaccounts.
      ptransaction      :: Maybe Transaction,       -- ^ this posting's parent transaction (co-recursive types).
                                                    --   Tying this knot gets tedious, Maybe makes it easier/optional.
      poriginal         :: Maybe Posting            -- ^ When this posting has been transformed in some way
                                                    --   (eg its amount or cost was inferred, or the account name was
                                                    --   changed by a pivot or budget report), this references the original
                                                    --   untransformed posting (which will have Nothing in this field).
    } deriving (Generic)

-- The equality test for postings ignores the parent transaction's
-- identity, to avoid recurring ad infinitum.
-- XXX could check that it's Just or Nothing.
instance Eq Posting where
    (==) (Posting a1 b1 c1 d1 e1 f1 g1 h1 i1 _ _) (Posting a2 b2 c2 d2 e2 f2 g2 h2 i2 _ _) =  a1==a2 && b1==b2 && c1==c2 && d1==d2 && e1==e2 && f1==f2 && g1==g2 && h1==h2 && i1==i2

-- | Posting's show instance elides the parent transaction so as not to recurse forever.
instance Show Posting where
  show Posting{..} = "PostingPP {" ++ intercalate ", " [
     "pdate="             ++ show (show pdate)
    ,"pdate2="            ++ show (show pdate2)
    ,"pstatus="           ++ show (show pstatus)
    ,"paccount="          ++ show paccount
    ,"pamount="           ++ show pamount
    ,"pcomment="          ++ show pcomment
    ,"ptype="             ++ show ptype
    ,"ptags="             ++ show ptags
    ,"pbalanceassertion=" ++ show pbalanceassertion
    ,"ptransaction="      ++ show (ptransaction $> "txn")
    ,"poriginal="         ++ show poriginal
    ] ++ "}"

data Transaction = Transaction {
      tindex                   :: Integer,   -- ^ this transaction's 1-based position in the transaction stream, or 0 when not available
      tprecedingcomment        :: Text,      -- ^ any comment lines immediately preceding this transaction
      tsourcepos               :: (SourcePos, SourcePos),  -- ^ the file position where the date starts, and where the last posting ends
      tdate                    :: Day,
      tdate2                   :: Maybe Day,
      tstatus                  :: Status,
      tcode                    :: Text,
      tdescription             :: Text,
      tcomment                 :: Text,      -- ^ this transaction's comment lines, as a single non-indented multi-line string
      ttags                    :: [Tag],     -- ^ tag names and values, extracted from the comment
      tpostings                :: [Posting]  -- ^ this transaction's postings
    } deriving (Eq,Generic,Show)

-- | A transaction modifier rule. This has a query which matches postings
-- in the journal, and a list of transformations to apply to those
-- postings or their transactions. Currently there is one kind of transformation:
-- the TMPostingRule, which adds a posting ("auto posting") to the transaction,
-- optionally setting its amount to the matched posting's amount multiplied by a constant.
data TransactionModifier = TransactionModifier {
      tmquerytxt :: Text,
      tmpostingrules :: [TMPostingRule]
    } deriving (Eq,Generic,Show)

nulltransactionmodifier = TransactionModifier{
  tmquerytxt = ""
 ,tmpostingrules = []
}

-- | A transaction modifier transformation, which adds an extra posting
-- to the matched posting's transaction.
-- Can be like a regular posting, or can have the tmprIsMultiplier flag set,
-- indicating that it's a multiplier for the matched posting's amount.
data TMPostingRule = TMPostingRule
  { tmprPosting :: Posting
  , tmprIsMultiplier :: Bool
  } deriving (Eq,Generic,Show)

-- | A periodic transaction rule, describing a transaction that recurs.
data PeriodicTransaction = PeriodicTransaction {
      ptperiodexpr   :: Text,     -- ^ the period expression as written
      ptinterval     :: Interval, -- ^ the interval at which this transaction recurs
      ptspan         :: DateSpan, -- ^ the (possibly unbounded) period during which this transaction recurs. Contains a whole number of intervals.
      --
      ptsourcepos    :: (SourcePos, SourcePos),  -- ^ the file position where the period expression starts, and where the last posting ends
      ptstatus       :: Status,   -- ^ some of Transaction's fields
      ptcode         :: Text,
      ptdescription  :: Text,
      ptcomment      :: Text,
      pttags         :: [Tag],
      ptpostings     :: [Posting]
    } deriving (Eq,Generic) -- , Show in PeriodicTransaction.hs

nullperiodictransaction = PeriodicTransaction{
      ptperiodexpr   = ""
     ,ptinterval     = def
     ,ptspan         = def
     ,ptsourcepos    = (SourcePos "" (mkPos 1) (mkPos 1), SourcePos "" (mkPos 1) (mkPos 1))
     ,ptstatus       = Unmarked
     ,ptcode         = ""
     ,ptdescription  = ""
     ,ptcomment      = ""
     ,pttags         = []
     ,ptpostings     = []
}

data TimeclockCode = SetBalance | SetRequiredHours | In | Out | FinalOut deriving (Eq,Ord,Generic)

data TimeclockEntry = TimeclockEntry {
      tlsourcepos   :: SourcePos,
      tlcode        :: TimeclockCode,
      tldatetime    :: LocalTime,
      tlaccount     :: AccountName,
      tldescription :: Text,
      tlcomment     :: Text,
      tltags        :: [Tag]
    } deriving (Eq,Ord,Generic)

-- | A market price declaration made by the journal format's P directive.
-- It declares two things: a historical exchange rate between two commodities,
-- and an amount display style for the second commodity.
data PriceDirective = PriceDirective {
   pdsourcepos :: SourcePos
  ,pddate      :: Day
  ,pdcommodity :: CommoditySymbol
  ,pdamount    :: Amount
  } deriving (Eq,Ord,Generic,Show)

-- | A historical market price (exchange rate) from one commodity to another.
-- A more concise form of a PriceDirective, without the amount display info.
data MarketPrice = MarketPrice {
   mpdate :: Day                -- ^ Date on which this price becomes effective.
  ,mpfrom :: CommoditySymbol    -- ^ The commodity being converted from.
  ,mpto   :: CommoditySymbol    -- ^ The commodity being converted to.
  ,mprate :: Quantity           -- ^ One unit of the "from" commodity is worth this quantity of the "to" commodity.
  } deriving (Eq,Ord,Generic, Show)

showMarketPrice MarketPrice{..} = unwords [show mpdate, T.unpack mpfrom <> ">" <> T.unpack mpto, show mprate]
showMarketPrices = intercalate "\n" . map ((' ':).showMarketPrice) . sortBy (comparing mpdate)

-- additional valuation-related types in Valuation.hs

-- | A journal, containing general ledger transactions; also directives and various other things.
-- This is hledger's main data model.
--
-- During parsing, it is used as the type alias "ParsedJournal".
-- The jparse* fields are mainly used during parsing and included here for convenience.
-- The list fields described as "in parse order" are usually reversed for efficiency during parsing.
-- After parsing, "journalFinalise" converts ParsedJournal to a finalised "Journal",
-- which has all lists correctly ordered, and much data inference and validation applied.
--
data Journal = Journal {
  -- parsing-related state
   jparsedefaultyear        :: Maybe Year                             -- ^ the current default year, specified by the most recent Y directive (or current date)
  ,jparsedefaultcommodity   :: Maybe (CommoditySymbol,AmountStyle)    -- ^ the current default commodity and its format, specified by the most recent D directive
  ,jparsedecimalmark        :: Maybe DecimalMark                      -- ^ the character to always parse as decimal point, if set by CsvReader's decimal-mark (or a future journal directive)
  ,jparseparentaccounts     :: [AccountName]                          -- ^ the current stack of parent account names, specified by apply account directives
  ,jparsealiases            :: [AccountAlias]                         -- ^ the current account name aliases in effect, specified by alias directives (& options ?)
  -- ,jparsetransactioncount :: Integer                               -- ^ the current count of transactions parsed so far (only journal format txns, currently)
  ,jparsetimeclockentries   :: [TimeclockEntry]                       -- ^ timeclock sessions which have not been clocked out
  ,jincludefilestack        :: [(FilePath, FilePath)]                 -- ^ (absolute path, canonical path) of included files, most recent first
-- principal data
  ,jdeclaredpayees          :: [(Payee,PayeeDeclarationInfo)]         -- ^ Payees declared by payee directives, in parse order.
  ,jdeclaredtags            :: [(TagName,TagDeclarationInfo)]         -- ^ Tags declared by tag directives, in parse order.
  ,jdeclaredaccounts        :: [(AccountName,AccountDeclarationInfo)] -- ^ Accounts declared by account directives, in parse order.
  ,jdeclaredaccounttags     :: M.Map AccountName [Tag]                -- ^ Accounts which were declared with tags, and those tags.
  ,jdeclaredaccounttypes    :: M.Map AccountType [AccountName]        -- ^ Accounts which were declared with a type: tag, grouped by the type.
  ,jaccounttypes            :: M.Map AccountName AccountType          -- ^ All the account types known, from account declarations or account names or parent accounts.
  ,jdeclaredcommodities     :: M.Map CommoditySymbol Commodity        -- ^ Commodities (and their display styles) declared by commodity directives, in parse order.
  ,jdeclaredcommoditytags   :: M.Map CommoditySymbol [Tag]            -- ^ Commodities which were declared with tags, and those tags.
  ,jinferredcommoditystyles :: M.Map CommoditySymbol AmountStyle      -- ^ Commodity display styles inferred from amounts in the journal.
  ,jglobalcommoditystyles   :: M.Map CommoditySymbol AmountStyle      -- ^ Commodity display styles declared by command line options (sometimes augmented, see the import command).
  ,jpricedirectives         :: [PriceDirective]                       -- ^ P (market price) directives in the journal, in parse order.
  ,jinferredmarketprices    :: [MarketPrice]                          -- ^ Market prices inferred from transactions in the journal, in parse order.
  ,jtxnmodifiers            :: [TransactionModifier]                  -- ^ Auto posting rules declared in the journal.
  ,jperiodictxns            :: [PeriodicTransaction]                  -- ^ Periodic transaction rules declared in the journal.
  ,jtxns                    :: [Transaction]                          -- ^ Transactions recorded in the journal. The important bit.
  ,jfinalcommentlines       :: Text                                   -- ^ any final trailing comments in the (main) journal file
  ,jfiles                   :: [(FilePath, Text)]                     -- ^ the file path and raw text of the main and
                                                                      --   any included journal files. The main file is first,
                                                                      --   followed by any included files in the order encountered.
                                                                      --   TODO: FilePath is a sloppy type here, don't assume it's a
                                                                      --   real file; values like "" or "-" can be seen
  ,jlastreadtime            :: POSIXTime                              -- ^ when this journal was last read from its file(s)
  -- NOTE: after adding new fields, eg involving account names, consider updating
  -- the Anon instance in Hleger.Cli.Anon
  } deriving (Eq, Generic)

-- | A journal in the process of being parsed, not yet finalised.
-- The data is partial, and list fields are in reverse order.
type ParsedJournal = Journal

-- | One of the standard *-separated value file types known by hledger,
data SepFormat 
  = Csv  -- comma-separated
  | Tsv  -- tab-separated
  | Ssv  -- semicolon-separated
  deriving (Eq, Ord)

-- XXX A little confusion, this is also used to name readers in splitReaderPrefix.
-- readers, input formats, and output formats overlap but are distinct concepts.
-- | The id of a data format understood by hledger, eg @journal@ or @csv@.
-- The --output-format option selects one of these for output.
data StorageFormat 
  = Rules 
  | Journal' 
  | Ledger' 
  | Timeclock 
  | Timedot 
  | Sep SepFormat 
  deriving (Eq, Ord)

instance Show SepFormat where
  show Csv = "csv"
  show Ssv = "ssv"
  show Tsv = "tsv"

instance Show StorageFormat where
  show Rules = "rules"
  show Journal' = "journal"
  show Ledger' = "ledger"
  show Timeclock = "timeclock"
  show Timedot = "timedot"
  show (Sep Csv) = "csv"
  show (Sep Ssv) = "ssv"
  show (Sep Tsv) = "tsv"

-- | Extra information found in a payee directive.
data PayeeDeclarationInfo = PayeeDeclarationInfo {
   pdicomment :: Text   -- ^ any comment lines following the payee directive
  ,pditags    :: [Tag]  -- ^ tags extracted from the comment, if any
} deriving (Eq,Show,Generic)

nullpayeedeclarationinfo = PayeeDeclarationInfo {
   pdicomment          = ""
  ,pditags             = []
}

-- | Extra information found in a tag directive.
newtype TagDeclarationInfo = TagDeclarationInfo {
   tdicomment :: Text   -- ^ any comment lines following the tag directive. No tags allowed here.
} deriving (Eq,Show,Generic)

nulltagdeclarationinfo = TagDeclarationInfo {
   tdicomment          = ""
}

-- | Extra information about an account that can be derived from
-- its account directive (and the other account directives).
data AccountDeclarationInfo = AccountDeclarationInfo {
   adicomment          :: Text   -- ^ any comment lines following an account directive for this account
  ,aditags             :: [Tag]  -- ^ tags extracted from the account comment, if any
  ,adideclarationorder :: Int    -- ^ the order in which this account was declared,
                                 --   relative to other account declarations, during parsing (1..)
  ,adisourcepos        :: SourcePos  -- ^ source file and position
} deriving (Eq,Show,Generic)

nullaccountdeclarationinfo = AccountDeclarationInfo {
   adicomment          = ""
  ,aditags             = []
  ,adideclarationorder = 0
  ,adisourcepos        = SourcePos "" (mkPos 1) (mkPos 1)
}

-- | An account within a hierarchy, with references to its parent
-- and subaccounts if any, and with per-report-period data of type 'a'.
-- Only the name is required; the other fields may or may not be present.
data Account a = Account {
   aname                     :: AccountName        -- ^ full name
  ,adeclarationinfo          :: Maybe AccountDeclarationInfo  -- ^ optional extra info from account directives
  -- relationships in the tree
  ,asubs                     :: [Account a]        -- ^ subaccounts
  ,aparent                   :: Maybe (Account a)  -- ^ parent account
  ,aboring                   :: Bool               -- ^ used in some reports to indicate elidable accounts
  ,adata                     :: PeriodData a       -- ^ associated data per report period
  } deriving (Generic, Functor)

-- | A general container for storing data values associated with zero or more
-- contiguous report (sub)periods, and with the (open ended) pre-report period.
-- The report periods are typically all the same length, but need not be.
--
-- Report periods are represented only by their start dates, used as the keys of a Map.
data PeriodData a = PeriodData {
   pdpre     :: a            -- ^ data for the period before the report
  ,pdperiods :: M.Map Day a  -- ^ data for each period within the report
  } deriving (Eq, Ord, Functor, Generic)

-- | Data that's useful in "balance" reports:
-- subaccount-exclusive and -inclusive amounts,
-- typically representing either a balance change or an end balance;
-- and a count of postings.
data BalanceData = BalanceData {
   bdexcludingsubs :: MixedAmount  -- ^ balance data excluding subaccounts
  ,bdincludingsubs :: MixedAmount  -- ^ balance data including subaccounts
  ,bdnumpostings :: Int            -- ^ the number of postings
  } deriving (Eq, Generic)

-- | Whether an account's balance is normally a positive number (in
-- accounting terms, a debit balance) or a negative number (credit balance).
-- Assets and expenses are normally positive (debit), while liabilities, equity
-- and income are normally negative (credit).
-- https://en.wikipedia.org/wiki/Normal_balance
data NormalSign = NormallyPositive | NormallyNegative deriving (Show, Eq)

-- | A Ledger has the journal it derives from, and the accounts
-- derived from that. Accounts are accessible both list-wise and
-- tree-wise, since each one knows its parent and subs; the first
-- account is the root of the tree and always exists.
data Ledger = Ledger {
   ljournal  :: Journal
  ,laccounts :: [Account BalanceData]
  } deriving (Generic)

instance NFData AccountAlias
instance NFData AccountDeclarationInfo
instance NFData AccountType
instance NFData Amount
instance NFData AmountCost
instance NFData AmountPrecision
instance NFData AmountStyle
instance NFData BalanceAssertion
instance NFData Commodity
instance NFData CostBasis
instance NFData DateSpan
instance NFData DigitGroupStyle
instance NFData EFDay
instance NFData Interval
instance NFData Journal
instance NFData MarketPrice
instance NFData MixedAmount
instance NFData MixedAmountKey
instance NFData Rounding
instance NFData PayeeDeclarationInfo
instance NFData PeriodicTransaction
instance NFData PostingType
instance NFData PriceDirective
instance NFData Side
instance NFData Status
instance NFData TagDeclarationInfo
instance NFData TimeclockCode
instance NFData TimeclockEntry
instance NFData TMPostingRule
instance NFData Transaction
instance NFData TransactionModifier

instance NFData Posting where
  -- Do not call rnf on the parent transaction to avoid recursive loops
  rnf (Posting d d2 s n a c t ta b mt op) =
      rnf d `seq` rnf d2 `seq` rnf s `seq` rnf n `seq` rnf a `seq` rnf c `seq` rnf t `seq` rnf ta `seq` rnf b `seq` mt `seq` rnf op `seq` ()
