module Data.Text.ParagraphLayout.Internal.RunSpec (spec) where

import Data.Text (Text, pack)
import Data.Text.Glyphize (Direction (..), Font, emptyFont)

import Test.Hspec
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.Run
import Data.Text.ParagraphLayout.Internal.TextOptions
import Data.Text.ParagraphLayout.TextData

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

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

spec :: Spec
spec = do
    describe "spanToRuns" $ do
        it "handles span with no text" $ do
            let inputSpan = sampleSpan englishEmpty emptyFont
            let runs = spanToRuns inputSpan
            runs `shouldBe` []
        it "handles Czech hello" $ do
            let inputSpan = sampleSpan czechHello emptyFont
            let runs = spanToRuns inputSpan
            runs `shouldBe`
                [ Run
                    { runOffsetInSpan = 0
                    , runText = spanText inputSpan
                    , runDirection = Just DirLTR
                    , runScript = Just "Latn"
                    }
                ]
        it "handles Arabic hello" $ do
            let inputSpan = sampleSpan arabicHello emptyFont
            let runs = spanToRuns inputSpan
            runs `shouldBe`
                [ Run
                    { runOffsetInSpan = 0
                    , runText = spanText inputSpan
                    , runDirection = Just DirRTL
                    , runScript = Just "Arab"
                    }
                ]
        it "handles Serbian with mixed script" $ do
            let inputSpan = sampleSpan serbianMixedScript emptyFont
            let runs = spanToRuns inputSpan
            runs `shouldBe`
                [ Run
                    -- TODO: We might want both parentheses in the same run.
                    { runOffsetInSpan = 0
                    , runText = pack "Vikipedija ("
                    , runDirection = Just DirLTR
                    , runScript = Just "Latn"
                    }
                , Run
                    { runOffsetInSpan = 12
                    , runText = pack "Википедија)"
                    , runDirection = Just DirLTR
                    , runScript = Just "Cyrl"
                    }
                ]
        it "handles English text with Arabic inside" $ do
            let inputSpan = sampleSpan englishAroundArabic emptyFont
            let runs = spanToRuns inputSpan
            runs `shouldBe`
                [ Run
                    { runOffsetInSpan = 0
                    , runText = pack "The title is "
                    , runDirection = Just DirLTR
                    , runScript = Just "Latn"
                    }
                , Run
                    { runOffsetInSpan = 13
                    -- TODO: The final space should be excluded.
                    , runText = pack "مفتاح معايير الويب "
                    , runDirection = Just DirRTL
                    , runScript = Just "Arab"
                    }
                , Run
                    { runOffsetInSpan = 48
                    , runText = pack "in Arabic."
                    , runDirection = Just DirLTR
                    , runScript = Just "Latn"
                    }
                ]