{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes       #-}
{-# LANGUAGE RecordWildCards   #-}
{-|
Module      : $header$
Copyright   : (c) Laurent P René de Cotret, 2020
License     : GNU GPL, version 2 or above
Maintainer  : laurent.decotret@outlook.com
Stability   : internal
Portability : portable

Rendering Plotly/R plots code blocks
-}

module Text.Pandoc.Filter.Plot.Renderers.PlotlyR (
      plotlyRSupportedSaveFormats
    , plotlyRCommand
    , plotlyRCapture
    , plotlyRAvailable
) where

import qualified Data.Text as T
import           Text.Pandoc.Filter.Plot.Renderers.Prelude


plotlyRSupportedSaveFormats :: [SaveFormat]
plotlyRSupportedSaveFormats = [PNG, PDF, SVG, JPG, EPS, HTML]


plotlyRCommand :: OutputSpec -> Text -> Text
plotlyRCommand OutputSpec{..} exe = [st|#{exe} "#{oScriptPath}"|]


plotlyRAvailable :: PlotM Bool
plotlyRAvailable = do
    mexe <- executable PlotlyR
    case mexe of 
        Nothing -> return False
        Just (Executable dir exe) -> 
            commandSuccess dir [st|#{exe} -e 'if(!require("plotly")) {quit(status=1)}'|]


plotlyRCapture :: FigureSpec -> FilePath -> Script
plotlyRCapture fs fp = 
    T.unlines [ "pdf(NULL)" -- Prevent the creation of empty Rplots.pdf
              , script fs
              , plotlyRCaptureFragment fs fp
              ]


plotlyRCaptureFragment :: FigureSpec -> FilePath -> Script
plotlyRCaptureFragment spec@FigureSpec{..} fname = case saveFormat of
    HTML -> plotlyRCaptureHtml spec fname
    _    -> plotlyRCaptureStatic spec fname


-- Based on the following discussion:
--    https://stackoverflow.com/q/34580095
plotlyRCaptureHtml :: FigureSpec -> FilePath -> Script
plotlyRCaptureHtml _ fname = [st|
library(plotly) # just in case
library(htmlwidgets)
p <- last_plot()
htmlwidgets::saveWidget(as_widget(p), "#{toRPath fname}")
|]


-- Based on the following documentation:
--    https://plotly.com/r/static-image-export/
plotlyRCaptureStatic :: FigureSpec -> FilePath -> Script
plotlyRCaptureStatic _ fname = [st|
library(plotly) # just in case
if (!require("processx")) install.packages("processx")
pdf(NULL)
orca(last_plot(), file = "#{toRPath fname}")
|]