module Data.Text.ParagraphLayout.Internal.ResolvedSpan (ResolvedSpan (..))
where

import Data.Text (Text)
import qualified Data.Text.ICU as BreakStatus (Line)

import Data.Text.ParagraphLayout.Internal.BiDiLevels
import Data.Text.ParagraphLayout.Internal.ResolvedBox
import Data.Text.ParagraphLayout.Internal.TextContainer
import Data.Text.ParagraphLayout.Internal.TextOptions

-- | Internal structure containing resolved values that may be shared with
-- other spans across the paragraph.
data ResolvedSpan d = ResolvedSpan
    { spanUserData :: d
    , spanIndex :: Int
    , spanOffsetInParagraph :: Int
    , spanText :: Text
    , spanTextOptions :: TextOptions
    , spanBoxes :: [ResolvedBox d]
    , spanBiDiLevels :: TextLevels
    , spanLineBreaks :: [(Int, BreakStatus.Line)]
    -- TODO: Can be optimised by starting with the shortest line break.
    , spanCharacterBreaks :: [(Int, ())]
    }

instance Eq (ResolvedSpan d) where
    a == b = spanIndex a == spanIndex b

instance TextContainer (ResolvedSpan d) where
    getText = spanText