---------------------------------------------------------------------
--- GUI for CurryBrowser, a generic analysis environment for declarative
--- programs.
---
--- @author Michael Hanus
--- @version October 2023
---------------------------------------------------------------------

module BrowserGUI where

import Control.Monad      ( unless )
import Curry.Compiler.Distribution ( curryCompiler )
import Data.IORef
import Data.List          ( delete, isPrefixOf, sortBy, union )
import Data.Maybe
import System.CPUTime     ( getCPUTime, getElapsedTime )

import Data.Time          ( toCalendarTime, calendarTimeToString )
import FlatCurry.Types
import FlatCurry.Files
import FlatCurry.Goodies
import FlatCurry.Show
import Graphics.UI
import System.Directory
import System.FilePath    ( (</>) )

import Analysis.Types     ( AOutFormat(..) )
import CASS.Doc           ( getAnalysisDoc )
import CASS.Server        ( initializeAnalysisSystem, analyzeModuleForBrowser )
import CASS.Registry      ( functionAnalysisInfos )
import Data.GraphViz      ( getDotViewCmd, setDotViewCmd )
import System.CurryPath   ( getLoadPathForModule, modNameToPath
                          , runModuleAction )
import System.Environment ( getArgs )
import ImportUsage        ( showImportCalls )
import FlatCurry.ShowIntMod ( funcModule, leqFunc )

import BrowserAnalysisTypes
import BrowserAnalysis
import BrowsePackageConfig            ( packagePath, packageVersion )
import CurryBrowseAnalysis.Dependency ( callsDirectly,indirectlyDependent )
import Imports

---------------------------------------------------------------------
-- Set this constant to True if the execution times of the main operations
-- should be shown in the status line:
showExecTime :: Bool
showExecTime = True

---------------------------------------------------------------------
-- Title and version
title :: String
title = "CurryBrowser (Version " ++ packageVersion ++ " of 20/09/2024)"

---------------------------------------------------------------------
-- Main program: check arguments, read interfaces, and run GUI:
main :: IO ()
main = do
  args <- getArgs
  case args of
   [a] -> runModuleAction startBrowser a
   _   -> putStrLn $ "ERROR: Illegal arguments for CurryBrowser: " ++
                     unwords args ++ "\n" ++
                     "Usage: curry-browse <module_name>"

readmeFile :: String
readmeFile = "README.md"

startBrowser :: String -> IO ()
startBrowser modname = do
  initializeAnalysisSystem
  putStr "Please be patient, reading all interfaces..."
  helptxt <- readFileInBrowserDir readmeFile
  mods <- getImportedInterfaces modname
  putStrLn "done"
  let mainmod = progName (progOfIFFP (snd (head mods)))
      trees = [Leaf mainmod
                    (mainmod,map (moduleImports . progOfIFFP . snd) mods)]
  stateref <- newIORef (GS trees modname mods
                           [] ("",OtherText,"") False Nothing)
  runInitGUI title
             (browserGUI stateref rmod rtxt (trees2strings trees))
             (\gp -> setValue rtxt helptxt gp >> setValue rmod "0" gp >>
                     return [])
 where rmod,rtxt free

-----------------------------------------------------------------------------
-- Structure of import tree to be shown:
data Tree a = Leaf String a          -- leaves have a name and a value
            | Node String a [Tree a] -- nodes have name, value and subtrees

trees2strings :: [Tree a] -> [String]
trees2strings trees = concatMap (tree2strings 0) trees

tree2strings :: Int -> Tree a -> [String]
tree2strings n (Leaf t _)       = [blanks n ++ "+ "++t]
tree2strings n (Node t _ trees) = (blanks n ++"- "++t)
                                  : concatMap (tree2strings (n+2)) trees

blanks :: Int -> String
blanks n = take n (repeat ' ')


-- get name of selected node in the tree list:
getTreesNodeName :: Int -> [Tree _] -> String
getTreesNodeName _ [] = error "getTreesNodeName: nothing selected" -- should not occur
getTreesNodeName n (Leaf name _ : trees) =
  if n==0 then name
          else getTreesNodeName (n-1) trees
getTreesNodeName n (Node t v subtrees : trees) =
  if n==0 then t
          else let l = length (tree2strings 0 (Node t v subtrees)) in
               if n < l
               then getTreesNodeName (n-1) subtrees
               else getTreesNodeName (n-l) trees

-- get selected value in the tree list:
getTreesValue :: Int -> [Tree a] -> a
getTreesValue _ [] = error "getTreesValue: nothing selected" -- should not occur
getTreesValue n (Leaf _ v : trees) =
  if n==0 then v
          else getTreesValue (n-1) trees
getTreesValue n (Node t v subtrees : trees) =
  if n==0 then v
          else let l = length (tree2strings 0 (Node t v subtrees)) in
               if n < l
               then getTreesValue (n-1) subtrees
               else getTreesValue (n-l) trees

-- change tree when click on some line (i.e., open or close a node):
changeTrees :: Int -> ImportTree -> IO ImportTree
changeTrees _ [] = return [] -- should not occur
changeTrees n (Leaf t v : trees) =
  if n==0 then openNode v >>= \newst -> return (Node t v newst : trees)
          else changeTrees (n-1) trees >>= \nts -> return (Leaf t v : nts)
changeTrees n (Node t v subtrees : trees) =
  if n==0 then return (Leaf t v : trees)
          else let l = length (tree2strings 0 (Node t v subtrees)) in
               if n < l
               then (changeTrees (n-1) subtrees) >>= \nsts ->
                    return (Node t v nsts : trees)
               else changeTrees (n-l) trees >>= \nts -> return (Node t v subtrees : nts)

openNode :: Eq a => (a, [(a, [String])]) -> IO [Tree (String, [(a, [String])])]
openNode (mod,modimps) = let mbimps = lookup mod modimps in
  return $  maybe [] (map (\m->Leaf m (m,modimps))) mbimps

-----------------------------------------------------------------------------
-- Operations on the state of the GUI:
-- The GUI state consists of
-- * the import tree
-- * the name of the main module (possibly including directory prefix)
-- * the list of all modules (module name, FlatCurry interface or program)
-- * the list of all currently shown functions of the module
-- * the name and contents of the module currently shown in the contents window
-- * flag: True if function list shows functions of currently selected module
-- * the currently selected function analysis

type ImportTree = [Tree (String,[(String,[String])])]


data GuiState = GS ImportTree
                   String
                   [(String,InterfaceOrFlatProg)]
                   [FuncDecl]
                   (String,ContentsKind,String)
                   Bool
                   (Maybe (FunctionAnalysis AnalysisResult))

-- get load path w.r.t. main module:
getMainLoadPath :: IORef GuiState -> IO [String]
getMainLoadPath gs = do
  (GS _ mainmod _ _ _ _ _) <- readIORef gs
  getLoadPathForModule mainmod

getTrees :: IORef GuiState -> IO ImportTree
getTrees gs = readIORef gs >>= \ (GS trees _ _ _ _ _ _) -> return trees

storeTrees :: IORef GuiState -> ImportTree -> IO ()
storeTrees gs trees = do
  (GS _ mm ms _ ct _ fana) <- readIORef gs
  writeIORef gs (GS trees mm ms [] ct False fana)

-- extract all reflexive-transitive imports for a module from GUI state:
getAllImportsOfModule :: IORef GuiState -> String -> IO [String]
getAllImportsOfModule gs mod = do
  (GS trees _ _ _ _ _ _) <- readIORef gs
  return (collectImports (importsOfRoot trees) [mod] [])
 where
   importsOfRoot []                       = []
   importsOfRoot ((Leaf _ (_,imps)) :_)   = imps
   importsOfRoot ((Node _ (_,imps) _) :_) = imps

   collectImports _ [] imps = imps
   collectImports modimps (m:ms) doneimps =
    if m `elem` doneimps
    then collectImports modimps ms doneimps
    else collectImports modimps (ms ++ fromJust (lookup m modimps)) (m:doneimps)

getFuns :: IORef GuiState -> IO [FuncDecl]
getFuns gs = readIORef gs >>= \ (GS _ _ _ funs _ _ _) -> return funs

storeSelectedFunctions :: IORef GuiState -> [FuncDecl] -> IO ()
storeSelectedFunctions gs funs = do
  (GS t mm ms _ ct flag fana) <- readIORef gs
  writeIORef gs (GS t mm ms (sortBy leqFunc funs) ct flag fana)

setMainContentsModule :: IORef GuiState -> String -> ContentsKind -> String
                      -> IO ()
setMainContentsModule gs cntmod cntkind contents = do
  (GS t mm ms fs _ flag fana) <- readIORef gs
  writeIORef gs (GS t mm ms fs
                   (if cntkind==OtherText then "" else cntmod,cntkind,contents)
                    flag fana)

getContentsModule :: IORef GuiState -> IO String
getContentsModule gs = do
  (GS _ _ _ _ (cntmod,_,_) _ _) <- readIORef gs
  return cntmod

getMainContents :: IORef GuiState -> IO (ContentsKind,String)
getMainContents gs = do
  (GS _ _ _ _ (_,cntkind,contents) _ _) <- readIORef gs
  return (cntkind,contents)

getFunctionListKind :: IORef GuiState -> IO Bool
getFunctionListKind gs = do
  (GS _ _ _ _ _ flag _) <- readIORef gs
  return flag

setFunctionListKind :: IORef GuiState -> Bool -> IO ()
setFunctionListKind gs flag = do
  (GS t mm ms fs cnttype _ fana) <- readIORef gs
  writeIORef gs (GS t mm ms fs cnttype flag fana)

-- get the interfaces (or FlatCurry programs) of all modules:
getAllModules :: IORef GuiState -> IO [Prog]
getAllModules gs = do
  (GS _ _ mods _ _ _ _) <- readIORef gs
  return (map (progOfIFFP . snd) mods)

-- get the interface (or FlatCurry program) of a specific module:
getIntWithName :: IORef GuiState -> String -> IO Prog
getIntWithName gs name = do
  (GS _ _ mods _ _ _ _) <- readIORef gs
  return (progOfIFFP . fromJust . lookup name $ mods)

-- get the FlatCurry program of a specific module (read, if necessary):
getProgWithName :: IORef GuiState -> (String->IO ()) -> String -> IO Prog
getProgWithName gs prt name = do
  (GS _ _ mods _ _ _ _) <- readIORef gs
  ifOrProg (\_->readProgAndStore gs prt name) return
           (fromJust (lookup name mods))

-- Get all data type declarations (also imported) of a module:
getAllTypes :: IORef GuiState -> (String->IO ()) -> String -> IO [TypeDecl]
getAllTypes gs _ mod =
  getAllImportsOfModule gs mod >>= \imps ->
  readIORef gs >>= \ (GS _ _ mods _ _ _ _) ->
  return (concatMap (progTypes . progOfIFFP . snd)
                    (filter ((`elem` imps) . fst) mods))

-- Get all function declarations (also imported) of a module:
getAllFunctions :: IORef GuiState -> (String->IO ()) -> String -> IO [FuncDecl]
getAllFunctions gs prt mod = do
  imps <- getAllImportsOfModule gs mod
  (GS _ _ mods _ _ _ _) <- readIORef gs
  mapM_ (readProgAndStoreIfNecessary gs prt)
        (filter ((`elem` imps) . fst) mods)
  (GS _ _ newmods _ _ _ _) <- readIORef gs
  return (concatMap (progFuncs . progOfIFFP . snd)
                    (filter ((`elem` imps) . fst) newmods))

-- Get all function names (also imported) of a module:
getAllFunctionNames :: IORef GuiState -> String -> IO [QName]
getAllFunctionNames gs mod =
  getAllImportsOfModule gs mod >>= \imps ->
  readIORef gs >>= \ (GS _ _ mods _ _ _ _) ->
  return (map funcName (concatMap (progFuncs . progOfIFFP . snd)
                                  (filter ((`elem` imps) . fst) mods)))

-- Get currently selected function analysis:
getCurrentFunctionAnalysis :: IORef GuiState ->
                              IO (Maybe (FunctionAnalysis AnalysisResult))
getCurrentFunctionAnalysis gs = do
  (GS _ _ _ _ _ _ fana) <- readIORef gs
  return fana

-- Set current function analysis:
setCurrentFunctionAnalysis :: IORef GuiState ->
                              (Maybe (FunctionAnalysis AnalysisResult)) -> IO ()
setCurrentFunctionAnalysis gs fana = do
  (GS ts mm mods fs ct flag _) <- readIORef gs
  writeIORef gs (GS ts mm mods fs ct flag fana)

-- read a FlatCurry program and store if not already done
readProgAndStore :: IORef GuiState -> (String -> IO ()) -> String -> IO Prog
readProgAndStore gs prt mod = do
  (GS ts mm mods fs ct flag fana) <- readIORef gs
  loadpath <- getMainLoadPath gs
  prog <- readFlatCurryFileInLoadPath prt mod loadpath
  writeIORef gs (GS ts mm (update mod prog mods) fs ct flag fana)
  return prog
 where
  update _ _ [] = []
  update nm pr ((n,p):ms) = if n==nm then (n,FP pr):ms
                                     else (n,p) : update nm pr ms

-- read a FlatCurry program and store if not already done
readProgAndStoreIfNecessary :: IORef GuiState -> (String -> IO ()) ->
                               (String,InterfaceOrFlatProg) -> IO ()
readProgAndStoreIfNecessary _  _   (_,FP _)    = return ()
readProgAndStoreIfNecessary gs prt (name,IF _) =
   readProgAndStore gs prt name >> return ()

-- find a function declaration in a list of fdecls for a given name:
findDecl4name :: [FuncDecl] -> QName -> FuncDecl
findDecl4name [] _ = error "Internal error in fundDecl4name!"
findDecl4name (fd:fds) qn | funcName fd == qn = fd
                          | otherwise         = findDecl4name fds qn

-----------------------------------------------------------------------------
-- The GUI of the browser:

browserGUI :: IORef GuiState -> WidgetRef -> WidgetRef -> [String] -> Widget
browserGUI gstate rmod rtxt names =
 col [
   row [
     Col [LeftAlign] [
       Label [Text "Select module and imports:"],
       ListBoxScroll [WRef rmod, List names, Width 20, Height 14,
                      Cmd (showBusy selmod), Background "yellow", Fill],
       MenuButton
        [Text "Analyze selected module...",
         Menu (map (\ (aname,acmt,afun) ->
                       MButton (showMBusy (analyzeAllFuns acmt afun)) aname)
                   allFunctionAnalyses)],
       MenuButton
        [Text "Analyze selected module with CASS...",
         Menu (map (\ (aname,atitle) ->
                      MButton (showMBusy (analyzeAllFunsWithCASS aname atitle))
                              atitle)
                   (sortBy (\i1 i2 -> snd i1 <= snd i2) functionAnalysisInfos))],
       row [MenuButton
             [Text "Select functions...",
              Menu [MButton (showMBusy (executeForModule showExportedFuns))
                            "exported and defined in selected module",
                    MButton (showMBusy (executeForModule showAllModuleFuns))
                            "defined in selected module",
                    MButton (showMBusy (executeForModule showAllExportedFuns))
                            "exported by selected and imported modules",
                    MButton (showMBusy selectDirectCalls)
                            "all direct dependants from selected function",
                    MButton (showMBusy selectInDirectCalls)
                            "all dependants from selected function"]],
            CheckButton [Text "focus in code", WRef focusbutton,
                         Cmd focusFunctionIfSelected]],
       ListBoxScroll [WRef rfun, Width 20, Height 16,
                      Cmd (showBusy selectFunction), Background "white", Fill]],
     Col [LeftAlign] [
       row [Button (showBusy (executeForModule showSource)) [Text "Show source"],
            MenuButton
              [Text "Show selected module as...",
               Menu (map (\ (t,ma) ->
                            MButton (showMBusy (executeForModule
                                                    (analyzeModuleWith ma))) t)
                         moduleAnalyses)],
            MenuButton
              [Text "Tools...",
               Menu [MButton (showMBusy (executeForModule showImpCalls))
                             "List calls to imported functions in selected module",
                     MButton (showMBusy showImportGraph)
                             "Show import graph of all modules (except prelude) (DOT)"]],
            MenuButton
              [Text "File...",
               Menu [MButton (showMBusy (executeForModule showModuleInfo))
                             "...information of selected module",
                     MButton (showMBusy saveMainText) "Save program text as...",
                     MSeparator,
                     MButton (\gp->exitGUI gp >> return []) "Exit"]],
            MenuButton
              [Text "Settings...",
               Menu [MButton setViewDot
                             "Set viewer for dot graph specifications"]],
            Label [FillX],
            MenuButton
              [Text "Help...",
               Menu [MButton (showMBusy (help readmeFile))
                             "About CurryBrowser",
                     MSeparator,
                     MButton (showMBusy (help "Help.txt"))
                             "How to use CurryBrowser",
                     MButton (showMBusy (help "Extend.txt"))
                             "How to extend CurryBrowser"]]
              ],
       TextEditScroll [WRef rtxt, Height 25, Width 80, Background "white"],
       Row [LeftAlign]
        [Label [Text "Current function analysis:"],
         Entry [Text noAnalysisText, WRef anaentry,
                Background "white", FillX],
         MenuButton
          [Text "Select analysis...",
           Menu (MButton (showMBusy deselectFunAna) noAnalysisText :
                 map (\(name,ana) -> MButton (showMBusy (selectAna name ana))
                                             name)
                     functionAnalyses)]],
       TextEditScroll [WRef resultwidget, Height 5, Width 72,
                       Background "white"]]],
   Label [WRef rstatus, Text "Status: ready", Background "green", FillX]]
 where
  resultwidget,rfun,focusbutton,rstatus,anaentry free

  saveMainText gp = do
    file <- getSaveFile
    unless (null file) $ getValue rtxt gp >>= writeFile file

  -- put a message in main contents widget:
  putMainMessage gp msg = do
    setValue rtxt msg gp
    setMainContentsModule gstate "" OtherText msg

  -- set viewer for DOT files:
  setViewDot _ = do
     oldcmd <- getDotViewCmd
     getAnswer "Command to view dot files:" oldcmd
               (\cmd -> unless (oldcmd==cmd) $ setDotViewCmd cmd)
     return []

  -- show info texts:
  help localhelpfile gp =
    readFileInBrowserDir localhelpfile >>= putMainMessage gp

  -- show business while executing an event handler:
  showBusy handler gp = do
     setConfig rstatus (Background "red") gp
     setConfig rstatus (Text "Status: running") gp
     let elapsed = curryCompiler == "pakcs"
     time1 <- if elapsed then getElapsedTime else getCPUTime
     handler gp
     time2 <- if elapsed then getElapsedTime else getCPUTime
     setConfig rstatus
       (Text $ if showExecTime
                 then "Status: ready (" ++
                      (if elapsed then "elapsed time: " else "exec time: ") ++
                      show(time2-time1) ++ " msecs)"
                 else "Status: ready") gp
     setConfig rstatus (Background "green") gp

  showMBusy handler gp = showBusy handler gp >> return []

  -- show what we are doing in status line:
  showDoing gp str = setConfig rstatus (Text ("Status: "++str)) gp

  -- Execute an I/O action safely, i.e., catch all errors and failures:
  safeIO gp act =
    catch act (\e -> putMainMessage gp ("Failure occurred: " ++ show e))

  -- click on a module name in left module column:
  selmod gp = do
    sel <- getValue rmod gp
    unless (null sel) $ do
      putMainMessage gp ""
      setConfig rfun (List []) gp
      trees <- getTrees gstate
      newtrees <- changeTrees (read sel) trees
      storeTrees gstate newtrees
      setConfig rmod (List (trees2strings newtrees)) gp
      setValue resultwidget "" gp
      setValue rmod sel gp

  -- get the name of the selected module (or Nothing in case of no selection):
  getSelectedModName gp = do
    sel <- getValue rmod gp
    if null sel
      then return Nothing
      else getTrees gstate >>= \trees ->
           return (Just (fst (getTreesValue (read sel) trees)))

  -- execute event handler on the selected module
  -- (or show "nothing selected" message):
  executeForModule modhandler gp =
    getSelectedModName gp >>= \mod ->
    if isNothing mod
      then putMainMessage gp "No module selected!"
      else modhandler (fromJust mod) gp

  -- analyze a selected module:
  analyzeModuleWith modanalysis mod gp = safeIO gp $
    performModuleAnalysis modanalysis (showDoing gp) mod >>= \res ->
    showModAnalysisResult mod res gp

  showModAnalysisResult mod (ContentsResult cntkind contents) gp = do
    setValue rtxt contents gp
    setMainContentsModule gstate mod cntkind contents
  showModAnalysisResult _ (ModuleAction act) _ = act

  -- show module source code:
  showSource mod gp = do
    loadpath <- getMainLoadPath gstate
    mbprogname <- findFileWithSuffix (modNameToPath mod)
                                   [".lcurry",".curry"] loadpath
    maybe (putMainMessage gp ("Source file of '"++mod++"' does not exist!"))
          (\filename -> do
                source <- readFile filename
                setValue rtxt source gp
                setMainContentsModule gstate mod
                  (if take 7 (reverse filename) == "yrrucl."
                  then LCurryProg else CurryProg) source
          )
          mbprogname

  -- show information about a module:
  showModuleInfo mod gp = do
    loadpath <- getMainLoadPath gstate
    mbsrcfile <- findFileWithSuffix (modNameToPath mod)
                                  [".lcurry",".curry"] loadpath
    mbfcyfile <- findFileWithSuffix (flatCurryFileName mod) [""] loadpath
    srcinfo   <- getFileInfo 2 mbsrcfile
    fcyinfo   <- getFileInfo 4 mbfcyfile
    let msg = "Source file:    " ++ srcinfo ++
            "\nFlatCurry file: " ++ fcyinfo
    putMainMessage gp msg

  -- returns information about a possible file:
  getFileInfo _ Nothing = return "does not exist"
  getFileInfo bls (Just fname) = do
    fsize <- getFileSize fname
    ftime <- getModificationTime fname
    ctime <- toCalendarTime ftime
    return $ fname ++ take bls (repeat ' ')
                   ++ "(" ++ calendarTimeToString ctime
                   ++ ", size: " ++ show fsize ++ " bytes)"

  -- show module dependency graph:
  showImportGraph gp =
    getAllModules gstate >>= \mods ->
    safeIO gp $
       viewDependencyGraph
         (concatMap (\(Prog mod imps _ _ _) ->
                          if mod=="Prelude"
                            then []
                            else [(mod,[],delete "Prelude" imps)]) mods)

  -- show import calls of selected module:
  showImpCalls mod gp =
    getProgWithName gstate (showDoing gp) mod >>= \prog ->
    putMainMessage gp (showImportCalls prog)

  -- show module's functions:
  showAllModuleFuns mod gp = do
    prog <- getProgWithName gstate (showDoing gp) mod
    storeSelectedFunctions gstate (progFuncs prog)
    setFunctionListKind gstate True
    funs <- getFuns gstate
    setConfig rfun (List (map (snd . funcName) funs)) gp

  -- show module's exported functions:
  showExportedFuns mod gp = do
    prog <- getProgWithName gstate (showDoing gp) mod
    storeSelectedFunctions gstate (filter isPublic (progFuncs prog))
    setFunctionListKind gstate True
    funs <- getFuns gstate
    setConfig rfun (List (map (snd . funcName) funs)) gp

  -- show exported functions of module and selected modules:
  showAllExportedFuns mod gp = do
    allfuns <- getAllFunctions gstate (showDoing gp) mod
    storeSelectedFunctions gstate (filter isPublic allfuns)
    setFunctionListKind gstate False
    funs <- getFuns gstate
    setConfig rfun (List (map showQNameWithMod (map funcName funs))) gp

  -- select all functions that directly depend on selected function:
  selectDirectCalls gp = do
    mod <- getSelectedModName gp
    self <- getValue rfun gp
    unless (isNothing mod || null self) $ do
      funs <- getFuns gstate
      let mainfun = funs!!(read self)
          qfnames = sortBy leqQName
                      (union [funcName mainfun] (callsDirectly mainfun))
      allfuns <- getAllFunctions gstate (showDoing gp) (fromJust mod)
      storeSelectedFunctions gstate (map (findDecl4name allfuns) qfnames)
      setFunctionListKind gstate False
      setConfig rfun (List (map showQNameWithMod qfnames)) gp

  -- select all functions that indirectly depend on selected function:
  selectInDirectCalls gp = do
    mod <- getSelectedModName gp
    self <- getValue rfun gp
    unless (isNothing mod || null self) $ do
      funs <- getFuns gstate
      let mainfun = funcName (funs!!(read self))
      allfuns <- getAllFunctions gstate (showDoing gp) (fromJust mod)
      let qfnames = sortBy leqQName
              (union [mainfun]
                     (fromJust (lookup mainfun (indirectlyDependent allfuns))))
      storeSelectedFunctions gstate (map (findDecl4name allfuns) qfnames)
      setFunctionListKind gstate False
      setConfig rfun (List (map showQNameWithMod qfnames)) gp

  -- click on a name in function column:
  selectFunction gp = safeIO gp $ do
    focusFunctionIfSelected gp
    analyzeFunctionIfSelected gp

  -- select a function analysis from the menu:
  selectAna ananame funana gp = safeIO gp $ do
    setCurrentFunctionAnalysis gstate (Just funana)
    setValue anaentry ananame gp
    analyzeFunctionIfSelected gp

  -- deselect function analysis from the menu:
  deselectFunAna gp = do
    setCurrentFunctionAnalysis gstate Nothing
    setValue anaentry noAnalysisText gp
    setValue resultwidget "" gp

  -- perform a function analysis if function is selected:
  analyzeFunctionIfSelected gp = do
    mod  <- getSelectedModName gp
    self <- getValue rfun gp
    fana <- getCurrentFunctionAnalysis gstate
    funs <- getFuns gstate
    unless (isNothing mod || null self || isNothing fana) $ do
      result <- performAnalysis (fromJust fana) (showDoing gp)
                                (funs!!read self)
      showAnalysisResult result gp

  showAnalysisResult (MsgResult str) gp = setValue resultwidget str gp
  showAnalysisResult (ActionResult act) gp = do
    str <- act
    setValue resultwidget str gp


  -- focus on a function if selected:
  focusFunctionIfSelected gp = do
    self <- getValue rfun gp
    focusvalue <- getValue focusbutton gp
    funs <- getFuns gstate
    unless (null self || focusvalue=="0") $
      showModuleAndFocusFunction gp (funcName (funs!!read self))

  -- focus on a function and load the source code, if necessary:
  showModuleAndFocusFunction gp (fmod,fname) =
    getContentsModule gstate >>= \cntmod ->
    if fmod == cntmod
    then getMainContents gstate >>= \(ct,cnt) ->
         let row = findFunDeclInProgText ct cnt (fmod,fname)
         in unless (row==0) $ seeText rtxt (row,1) gp
    else showSource fmod gp >>
         getMainContents gstate >>= \(ct,cnt) ->
         let row = findFunDeclInProgText ct cnt (fmod,fname)
         in unless (row==0) $ seeText rtxt (row,1) gp

  -- analyze all functions in the function column:
  analyzeAllFuns explanation analysis gp = safeIO gp $ do
    mod <- getSelectedModName gp
    unless (isNothing mod) $ do
      modfuns <- getFunctionListKind gstate
      let modName = fromJust mod
      unless modfuns $ showExportedFuns modName gp
      funs <- getFuns gstate
      setValue resultwidget explanation gp
      anaresults <- performAllAnalysis analysis (showDoing gp) modName funs
      setConfig rfun
                (List (map (\ (prefix,func)-> prefix++" "++snd (funcName func))
                           (zip anaresults funs)))
                gp

  -- analyze all functions with Curry Analysis Server System:
  analyzeAllFunsWithCASS analysisName explanation gp = safeIO gp $ do
    mod <- getSelectedModName gp
    unless (isNothing mod) $ do
      let modName = fromJust mod
      modfuns <- getFunctionListKind gstate
      unless modfuns $ showExportedFuns modName gp
      funs <- getFuns gstate
      mbdoc <- getAnalysisDoc analysisName
      setValue resultwidget (maybe explanation id mbdoc) gp
      showDoing gp "Analyzing..."
      results <- analyzeModuleForBrowser analysisName modName ANote
      setConfig rfun
        (List (map (\qf -> let info = maybe "?" id (lookup qf results)
                            in snd qf ++ if null info then ""
                                         else " >>> "++info)
                   (map funcName funs)))
        gp

  -- Perform an analysis on a module:
  performModuleAnalysis (InterfaceAnalysis ana) _ mod = do
    int <- getIntWithName gstate mod
    return (ana int)
  performModuleAnalysis (FlatCurryAnalysis ana) prt mod = do
    prog <- getProgWithName gstate prt mod
    return (ana prog)
  performModuleAnalysis (SourceCodeAnalysis ana) _ mod = do
    loadpath <- getMainLoadPath gstate
    mbfilename <- findFileWithSuffix (modNameToPath mod)
                                     [".lcurry",".curry"] loadpath
    maybe (return (ContentsResult
                   OtherText ("Curry source file for module \""++mod++"\" not found!")))
          (\filename -> ana filename)
          mbfilename

  -- Perform an analysis to a single function declaration:
  performAnalysis (LocalAnalysis ana) prt fdecl = do
    prt "Analyzing..."
    return (ana fdecl)
  performAnalysis (LocalDataAnalysis ana) prt fdecl = do
    types <- getAllTypes gstate prt (funcModule fdecl)
    prt "Analyzing..."
    return (ana types fdecl)
  performAnalysis (GlobalAnalysis ana) prt fdecl = do
    funcs <- getAllFunctions gstate prt (funcModule fdecl)
    prt "Analyzing..."
    return (fromJust (lookup (funcName fdecl) (ana funcs)))
  performAnalysis (GlobalDataAnalysis ana) prt fdecl = do
    let mod = funcModule fdecl
    types <- getAllTypes gstate prt mod
    funcs <- getAllFunctions gstate prt mod
    prt "Analyzing..."
    return (fromJust (lookup (funcName fdecl) (ana types funcs)))

  -- Perform an analysis to a list of function declarations:
  performAllAnalysis (LocalAnalysis ana) prt _ fdecls = do
    prt "Analyzing..."
    return (map ana fdecls)
  performAllAnalysis (LocalDataAnalysis ana) prt mod fdecls = do
    types <- getAllTypes gstate prt mod
    prt "Analyzing..."
    return (map (ana types) fdecls)
  performAllAnalysis (GlobalAnalysis ana) prt mod fdecls = do
    funcs <- getAllFunctions gstate prt mod
    prt "Analyzing..."
    let anaresults = ana funcs
    return (map (\fd->fromJust (lookup (funcName fd) anaresults)) fdecls)
  performAllAnalysis (GlobalDataAnalysis ana) prt mod fdecls = do
    types <- getAllTypes gstate prt mod
    funcs <- getAllFunctions gstate prt mod
    prt "Analyzing..."
    let anaresults = ana types funcs
    return (map (\fd->fromJust (lookup (funcName fd) anaresults)) fdecls)

isPublic :: FuncDecl -> Bool
isPublic fd = funcVisibility fd == Public

---------------------------------------------------------------------
-- find a function declaration in a program text:
findFunDeclInProgText :: ContentsKind -> String -> QName -> Int
findFunDeclInProgText CurryProg progtext fname =
  findFirstDeclLine (showCurryId (snd fname)) (lines progtext) 1
findFunDeclInProgText LCurryProg progtext fname =
  findFirstDeclLine ("> "++showCurryId (snd fname)) (lines progtext) 1
findFunDeclInProgText FlatCurryExp progtext fname =
  findFirstDeclLine ("  (Func (\""++fst fname++"\",\""++snd fname++"\")")
                    (lines progtext) 1
findFunDeclInProgText OtherText _ _ = 0

-- finds first declaration line:
findFirstDeclLine :: Eq a => [a] -> [[a]] -> Int -> Int
findFirstDeclLine _ [] _ = 0 -- not found
findFirstDeclLine f (l:ls) n =
     if isPrefixOf f l then n else findFirstDeclLine f ls (n+1)

---------------------------------------------------------------------
-- Reads file in the directory of the browser package.
readFileInBrowserDir :: String -> IO String
readFileInBrowserDir f = readFile (packagePath </> f)

-- order qualified names by basename first:
leqQName :: QName -> QName -> Bool
leqQName (mod1,n1) (mod2,n2) = n1 <= n2 || n1==n2 && mod1 <= mod2

-- show qualified name with module:
showQNameWithMod :: QName -> String
showQNameWithMod (m,n) = n++" ("++m++")"

noAnalysisText :: String
noAnalysisText = "*** no analysis ***"

---------------------------------------------------------------------
-- Get a string in a GUI box and process this input:
getAnswer :: String -> String -> (String -> IO ()) -> IO ()
getAnswer question initial processinput = do
   runInitGUI "" (Col []
                      [Label [Text question],
                       Entry [Text initial, WRef entry, Cmd getinput, FillX,
                              Background "white", Width 50],
                       Button getinput [Text "Ok"]])
                 (\gp -> focusInput entry gp >> return [])
  where
   entry free

   getinput wp = do inp <- getValue entry wp
                    processinput inp
                    exitGUI wp

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