module Data.Text.ParagraphLayout.SpanData
    ( emptySpan
    , czechHello
    , arabicHello
    , serbianMixedScript
    , englishAroundArabic
    )
where

import Data.Text (pack)
import Data.Text.Glyphize (Direction (DirLTR, DirRTL), Font)

import Data.Text.ParagraphLayout.Internal.BoxOptions
import Data.Text.ParagraphLayout.Internal.LineHeight
import Data.Text.ParagraphLayout.Internal.ResolvedBox
import Data.Text.ParagraphLayout.Internal.ResolvedSpan
import Data.Text.ParagraphLayout.Internal.TextOptions

defaultBox :: Direction -> ResolvedBox ()
defaultBox dir = ResolvedBox () 0 defaultBoxOptions dir

sampleSpan :: Direction -> String -> String -> Font -> ResolvedSpan ()
sampleSpan dir lang str font = ResolvedSpan
    { spanUserData = ()
    , spanIndex = 0
    , spanOffsetInParagraph = 0
    , spanText = text
    , spanTextOptions = (defaultTextOptions dir)
        { textFont = font
        , textLineHeight = Normal
        , textLanguage = lang
        }
    , spanBoxes = [defaultBox dir]
    , spanLineBreaks = []
    , spanCharacterBreaks = []
    }
    where
        text = pack str

emptySpan :: Font -> ResolvedSpan ()
emptySpan = sampleSpan DirLTR "en"
    ""

czechHello :: Font -> ResolvedSpan ()
czechHello = sampleSpan DirLTR "cs"
    "Ahoj, světe!"

arabicHello :: Font -> ResolvedSpan ()
arabicHello = sampleSpan DirRTL "ar"
    "سلام"

serbianMixedScript :: Font -> ResolvedSpan ()
serbianMixedScript = sampleSpan DirLTR "sr"
    "Vikipedija (Википедија)"

-- | Source:
-- <https://www.w3.org/International/articles/inline-bidi-markup/uba-basics>
englishAroundArabic :: Font -> ResolvedSpan ()
englishAroundArabic = sampleSpan DirLTR "en"
    "The title is مفتاح معايير الويب in Arabic."