{-# LANGUAGE QuasiQuotes       #-}
{-# LANGUAGE FlexibleContexts  #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE TypeApplications  #-}
{-# LANGUAGE GADTs             #-}
module Main where

import qualified Knit.Report                   as K

import qualified Data.Map                      as M
import qualified Data.Text                     as T
import           Data.String.Here               ( here )
import qualified Graphics.Vega.VegaLite        as V

templateVars :: M.Map String String
templateVars = M.fromList
  [ ("lang"     , "English")
  , ("author"   , "Adam Conner-Sax")
  , ("pagetitle", "knit-haskell simple example")
--  , ("tufte","True")
  ]

main :: IO ()
main = do
  let template = K.FromIncludedTemplateDir "pandoc-bootstrap-KH.html"
  pandocWriterConfig <- K.mkPandocWriterConfig template
                                               templateVars
                                               K.mindocOptionsF
  resSimpleE <- K.knitHtml (Just "ErrorExample.Main")
                           K.logAll
                           pandocWriterConfig
                           makeDocWithKnitError
  case resSimpleE of
    Right htmlAsText ->
      K.writeAndMakePathLT "examples/html/error_example.html" htmlAsText
    Left err -> putStrLn $ "Pandoc Error: " ++ show err

md1 :: T.Text
md1 = [here|
## Some example markdown
* [Markdown][MarkdownLink] is a nice way to write formatted notes with a minimum of code.
* It supports links and tables and some *styling* information.

[MarkDownLink]:<https://pandoc.org/MANUAL.html#pandocs-markdown>
|]

makeDocWithKnitError :: K.KnitOne effs => K.Sem effs ()
makeDocWithKnitError = K.wrapPrefix "makeDocWithKnitError" $ do
  K.logLE K.Info "adding some markdown..."
  K.addMarkDown md1
  K.logLE K.Info "adding some latex..."
  K.addMarkDown "## Some example latex"
  K.addLatex "Overused favorite equation: $e^{i\\pi} + 1 = 0$"
  K.logLE K.Info "adding a visualization..."
  K.knitError
    "Uh oh!  Something went wrong which I am explaining with this message."
  K.addMarkDown "## An example hvega visualization"
  _ <- K.addHvega Nothing Nothing exampleVis
  return ()


exampleVis :: V.VegaLite
exampleVis =
  let cars =
          V.dataFromUrl "https://vega.github.io/vega-datasets/data/cars.json" []
      enc =
          V.encoding
            . V.position V.X [V.PName "Horsepower", V.PmType V.Quantitative]
            . V.position V.Y [V.PName "Miles_per_Gallon", V.PmType V.Quantitative]
            . V.color [V.MName "Origin", V.MmType V.Nominal]
      bkg = V.background "rgba(0, 0, 0, 0.05)"
  in  V.toVegaLite [bkg, cars, V.mark V.Circle [], enc []]