-----------------------------------------------------------------------------
-- |
-- Module      :  Lentil.Print
-- Copyright   :  © 2015 Francesco Ariis
-- License     :  GPLv3 (see the LICENSE file)
--
-- printing types
-----------------------------------------------------------------------------

module Lentil.Print where

import Lentil.Types
import Lentil.Query

import Text.PrettyPrint.ANSI.Leijen as PP
import qualified Data.List as L


-- number of spaces + digits in indentation levels
indNum :: Int
indNum = 6

----------------
-- PRIMITIVES --
----------------

-- right align a number in a space of i columns
alignNumber :: Int -> Int -> String
alignNumber i n = replicate (i - length sn) ' ' ++ sn
    where sn = show n

-- Bool: wheter or not to use colours in rendering
myRender :: Bool -> Doc -> String
myRender col d = ($ "") . displayS . renderPretty 1 75 $ d'
    where d' | col       = d
             | otherwise = plain d


------------------
-- PRETTY PRINT --
------------------

data TagCol = Red | Blue deriving (Eq)
ppTag :: TagCol -> Tag -> Doc
ppTag c t = col (char openDel) <> string (tagString t) <>
            col (char closeDel)
    where col | c == Red  = red
              | otherwise = blue

ppIssue :: Int -> Issue -> Doc
ppIssue ind is = indent spInd ( fillSep [string iNum, string "",
                                         hang 0 (fillSep $ ppDescTags is)] )
    where
          ppDescTags :: Issue -> [Doc]
          ppDescTags i = map string (words (iPPDesc is)) ++
                         map (ppTag Blue) (iTags i)

          spInd = indNum - ind
          iNum  = alignNumber ind $ iRow is


ppFile :: Int -> [Issue] -> Doc
ppFile ind is = text (prettyFP $ iFile (head is)) PP.<$>
                vsep (map (ppIssue ind) is)

ppIssues :: Bool -> [Issue] -> String
ppIssues col is = myRender col $ vsep (L.intersperse softline igr)
    where
          ind = maximum . map (length . show . iRow) $ is
          igr = map (ppFile ind) $ groupIssues iFile is


-------------
-- REPORTS --
-------------

-- tagpop pp report
ppPopularity :: Bool -> [Issue] -> String
ppPopularity col is = myRender col $ text "Tags popularity:" PP.<$>
                                     vsep ppPops -- PP.<$> (string "")
    where
          listpop = tagPop is

          ind   = maximum . map (length . show . snd) $ listpop
          spInd = indNum - ind

          ppPop (t, n) = indent spInd (fillSep [iNum n, string "",
                                                hang 0 (ppTag Red t)])
          ppPops       = map ppPop listpop

          iNum n = string $ alignNumber ind n