---------------------------------------------------------
-- The main program for the hpc-report tool, part of HPC.
-- Colin Runciman and Andy Gill, June 2006
---------------------------------------------------------

module HpcReport (report_plugin) where

import Prelude hiding (exp)
import Data.List(sort,intersperse,sortBy)
import HpcFlags
import Trace.Hpc.Mix
import Trace.Hpc.Tix
import Control.Monad hiding (guard)
import qualified Data.Set as Set

notExpecting :: String -> a
notExpecting s = error ("not expecting "++s)

data BoxTixCounts = BT {boxCount, tixCount :: !Int}

btZero :: BoxTixCounts
btZero = BT {boxCount=0, tixCount=0}

btPlus :: BoxTixCounts -> BoxTixCounts -> BoxTixCounts
btPlus (BT b1 t1) (BT b2 t2) = BT (b1+b2) (t1+t2)

btPercentage :: String -> BoxTixCounts -> String
btPercentage s (BT b t) = showPercentage s t b

showPercentage :: String -> Int -> Int -> String
showPercentage s 0 0 = "100% "++s++" (0/0)"
showPercentage s n d = showWidth 3 p++"% "++
                       s++
                       " ("++show n++"/"++show d++")"
  where
  p = (n*100) `div` d
  showWidth w x0 = replicate (shortOf w (length sx)) ' ' ++ sx
                  where
                  sx = show x0
                  shortOf x y = if y < x then x-y else 0

data BinBoxTixCounts = BBT { binBoxCount
                           , onlyTrueTixCount
                           , onlyFalseTixCount
                           , bothTixCount :: !Int}

bbtzero :: BinBoxTixCounts
bbtzero = BBT { binBoxCount=0
              , onlyTrueTixCount=0
              , onlyFalseTixCount=0
              , bothTixCount=0}

bbtPlus :: BinBoxTixCounts -> BinBoxTixCounts -> BinBoxTixCounts
bbtPlus (BBT b1 tt1 ft1 bt1) (BBT b2 tt2 ft2 bt2) =
  BBT (b1+b2) (tt1+tt2) (ft1+ft2) (bt1+bt2)

bbtPercentage :: String -> Bool -> BinBoxTixCounts -> String
bbtPercentage s withdetail (BBT b tt ft bt) =
  showPercentage s bt b ++
  if withdetail && bt/=b then
    detailFor tt "always True"++
    detailFor ft "always False"++
    detailFor (b-(tt+ft+bt)) "unevaluated"
  else ""
  where
  detailFor n txt = if n>0 then ", "++show n++" "++txt
                    else ""

data ModInfo = MI { exp,alt,top,loc :: !BoxTixCounts
                  , guard,cond,qual :: !BinBoxTixCounts
                  , decPaths :: [[String]]}

miZero :: ModInfo
miZero = MI { exp=btZero
            , alt=btZero
            , top=btZero
            , loc=btZero
            , guard=bbtzero
            , cond=bbtzero
            , qual=bbtzero
            , decPaths = []}

miPlus :: ModInfo -> ModInfo -> ModInfo
miPlus mi1 mi2 =
  MI { exp = exp mi1 `btPlus` exp mi2
     , alt = alt mi1 `btPlus` alt mi2
     , top = top mi1 `btPlus` top mi2
     , loc = loc mi1 `btPlus` loc mi2
     , guard = guard mi1 `bbtPlus` guard mi2
     , cond  = cond  mi1 `bbtPlus` cond  mi2
     , qual  = qual  mi1 `bbtPlus` qual  mi2
     , decPaths = decPaths mi1 ++ decPaths mi2 }

allBinCounts :: ModInfo -> BinBoxTixCounts
allBinCounts mi =
  BBT { binBoxCount = sumAll binBoxCount
      , onlyTrueTixCount = sumAll onlyTrueTixCount
      , onlyFalseTixCount = sumAll onlyFalseTixCount
      , bothTixCount = sumAll bothTixCount }
  where
  sumAll f = f (guard mi) + f (cond mi) + f (qual mi)

accumCounts :: [(BoxLabel,Integer)] -> ModInfo -> ModInfo
accumCounts [] mi = mi
accumCounts ((bl,btc):etc) mi
 | single bl = accumCounts etc mi'
  where
  mi' = case bl of
        ExpBox False ->   mi{exp = inc (exp mi)}
        ExpBox True  ->   mi{exp = inc (exp mi), alt = inc (alt mi)}
        TopLevelBox dp -> mi{top = inc (top mi)
                            ,decPaths = upd dp (decPaths mi)}
        LocalBox dp ->    mi{loc = inc (loc mi)
                            ,decPaths = upd dp (decPaths mi)}
        _other ->          notExpecting "BoxLabel in accumcounts"
  inc (BT {boxCount=bc,tixCount=tc}) =
    BT { boxCount = bc+1
       , tixCount = tc + bit (btc>0) }
  upd dp dps =
    if btc>0 then dps else dp:dps
accumCounts [_] _ = error "accumCounts: Unhandled case: [_] _"
accumCounts ((bl0,btc0):(bl1,btc1):etc) mi =
  accumCounts etc mi'
  where
  mi' = case (bl0,bl1) of
        (BinBox GuardBinBox True, BinBox GuardBinBox False) ->
          mi{guard = inc (guard mi)}
        (BinBox CondBinBox True, BinBox CondBinBox False) ->
          mi{cond = inc (cond mi)}
        (BinBox QualBinBox True, BinBox QualBinBox False) ->
          mi{qual = inc (qual mi)}
        _other -> notExpecting "BoxLabel pair in accumcounts"
  inc (BBT { binBoxCount=bbc
           , onlyTrueTixCount=ttc
           , onlyFalseTixCount=ftc
           , bothTixCount=btc}) =
    BBT { binBoxCount       = bbc+1
        , onlyTrueTixCount  = ttc + bit (btc0 >0 && btc1==0)
        , onlyFalseTixCount = ftc + bit (btc0==0 && btc1 >0)
        , bothTixCount      = btc + bit (btc0 >0 && btc1 >0) }

bit :: Bool -> Int
bit True = 1
bit False = 0

single :: BoxLabel -> Bool
single (ExpBox {}) = True
single (TopLevelBox _) = True
single (LocalBox _) = True
single (BinBox {}) = False

modInfo :: Flags -> Bool -> TixModule -> IO ModInfo
modInfo hpcflags qualDecList tix@(TixModule moduleName _ _ tickCounts) = do
  Mix _ _ _ _ mes <- readMixWithFlags hpcflags (Right tix)
  return (q (accumCounts (zip (map snd mes) tickCounts) miZero))
  where
  q mi = if qualDecList then mi{decPaths = map (moduleName:) (decPaths mi)}
         else mi

modReport :: Flags -> TixModule -> IO ()
modReport hpcflags tix@(TixModule moduleName _ _ _) = do
  mi <- modInfo hpcflags False tix
  if xmlOutput hpcflags
    then putStrLn $ "  <module name = " ++ show moduleName  ++ ">"
    else putStrLn ("-----<module "++moduleName++">-----")
  printModInfo hpcflags mi
  if xmlOutput hpcflags
    then putStrLn $ "  </module>"
    else return ()

printModInfo :: Flags -> ModInfo -> IO ()
printModInfo hpcflags mi | xmlOutput hpcflags = do
  element "exprs" (xmlBT $ exp mi)
  element "booleans" (xmlBBT $ allBinCounts mi)
  element "guards" (xmlBBT $ guard mi)
  element "conditionals" (xmlBBT $ cond mi)
  element "qualifiers" (xmlBBT $ qual mi)
  element "alts" (xmlBT $ alt mi)
  element "local" (xmlBT $ loc mi)
  element "toplevel" (xmlBT $ top mi)
printModInfo hpcflags mi = do
  putStrLn (btPercentage "expressions used" (exp mi))
  putStrLn (bbtPercentage "boolean coverage" False (allBinCounts mi))
  putStrLn ("     "++bbtPercentage "guards" True (guard mi))
  putStrLn ("     "++bbtPercentage "'if' conditions" True (cond mi))
  putStrLn ("     "++bbtPercentage "qualifiers" True (qual mi))
  putStrLn (btPercentage "alternatives used" (alt mi))
  putStrLn (btPercentage "local declarations used" (loc mi))
  putStrLn (btPercentage "top-level declarations used" (top mi))
  modDecList hpcflags mi

modDecList :: Flags -> ModInfo -> IO ()
modDecList hpcflags mi0 =
  when (decList hpcflags && someDecsUnused mi0) $ do
    putStrLn "unused declarations:"
    mapM_ showDecPath (sort (decPaths mi0))
  where
  someDecsUnused mi = tixCount (top mi) < boxCount (top mi) ||
                      tixCount (loc mi) < boxCount (loc mi)
  showDecPath dp = putStrLn ("     "++
                             concat (intersperse "." dp))

report_plugin :: Plugin
report_plugin = Plugin { name = "report"
                       , usage = "[OPTION] .. <TIX_FILE> [<MODULE> [<MODULE> ..]]"
                       , options = report_options
                       , summary = "Output textual report about program coverage"
                       , implementation = report_main
                       , init_flags = default_flags
                       , final_flags = default_final_flags
                       }

report_main :: Flags -> [String] -> IO ()
report_main hpcflags (progName:mods) = do
  let hpcflags1 = hpcflags
                { includeMods = Set.fromList mods
                                   `Set.union`
                                includeMods hpcflags }
  let prog = getTixFileName $ progName
  tix <- readTix prog
  case tix of
    Just (Tix tickCounts) ->
           makeReport hpcflags1 progName
                    $ sortBy (\ mod1 mod2 -> tixModuleName mod1 `compare` tixModuleName mod2)
                    $ [ tix'
                      | tix'@(TixModule m _ _ _) <- tickCounts
                      , allowModule hpcflags1 m
                      ]
    Nothing -> hpcError report_plugin  $ "unable to find tix file for:" ++ progName
report_main _ [] =
        hpcError report_plugin $ "no .tix file or executable name specified"

makeReport :: Flags -> String -> [TixModule] -> IO ()
makeReport hpcflags progName modTcs | xmlOutput hpcflags = do
  putStrLn $ "<?xml version=\"1.0\" encoding=\"UTF-8\"?>"
  putStrLn $ "<coverage name=" ++ show progName ++ ">"
  if perModule hpcflags
    then mapM_ (modReport hpcflags) modTcs
    else return ()
  mis <- mapM (modInfo hpcflags True) modTcs
  putStrLn $ "  <summary>"
  printModInfo hpcflags (foldr miPlus miZero mis)
  putStrLn $ "  </summary>"
  putStrLn $ "</coverage>"
makeReport hpcflags _ modTcs =
  if perModule hpcflags then
    mapM_ (modReport hpcflags) modTcs
  else do
    mis <- mapM (modInfo hpcflags True) modTcs
    printModInfo hpcflags (foldr miPlus miZero mis)

element :: String -> [(String,String)] -> IO ()
element tag attrs = putStrLn $
                    "    <" ++ tag ++ " "
                        ++ unwords [ x ++ "=" ++ show y
                                   | (x,y) <- attrs
                                   ] ++ "/>"

xmlBT :: BoxTixCounts -> [(String, String)]
xmlBT (BT b t) = [("boxes",show b),("count",show t)]

xmlBBT :: BinBoxTixCounts -> [(String, String)]
xmlBBT (BBT b tt tf bt) = [("boxes",show b),("true",show tt),("false",show tf),("count",show (tt + tf + bt))]

------------------------------------------------------------------------------

report_options :: FlagOptSeq
report_options
        = perModuleOpt
        . decListOpt
        . excludeOpt
        . includeOpt
        . srcDirOpt
        . hpcDirOpt
        . resetHpcDirsOpt
        . xmlOutputOpt
        . verbosityOpt