#
#
#           The Nim Compiler
#        (c) Copyright 2015 Andreas Rumpf
#
#    See the file "copying.txt", included in this
#    distribution, for details about the copyright.
#

# implements the command dispatcher and several commands

when not defined(nimcore):
  {.error: "nimcore MUST be defined for Nim's core tooling".}

import
  llstream, strutils, ast, astalgo, lexer, syntaxes, renderer, options, msgs,
  os, condsyms, times,
  wordrecg, sem, semdata, idents, passes, extccomp,
  cgen, json, nversion,
  platform, nimconf, importer, passaux, depends, vm, vmdef, types, idgen,
  parser, modules, ccgutils, sigmatch, ropes,
  modulegraphs, tables, rod, lineinfos, pathutils

when not defined(leanCompiler):
  import jsgen, docgen, docgen2

from magicsys import resetSysTypes

proc codegenPass(g: ModuleGraph) =
  registerPass g, cgenPass

proc semanticPasses(g: ModuleGraph) =
  registerPass g, verbosePass
  registerPass g, semPass

proc writeDepsFile(g: ModuleGraph; project: AbsoluteFile) =
  let f = open(changeFileExt(project, "deps").string, fmWrite)
  for m in g.modules:
    if m != nil:
      f.writeLine(toFullPath(g.config, m.position.FileIndex))
  for k in g.inclToMod.keys:
    if g.getModule(k).isNil:  # don't repeat includes which are also modules
      f.writeLine(toFullPath(g.config, k))
  f.close()

proc commandGenDepend(graph: ModuleGraph) =
  semanticPasses(graph)
  registerPass(graph, gendependPass)
  compileProject(graph)
  let project = graph.config.projectFull
  writeDepsFile(graph, project)
  generateDot(graph, project)
  execExternalProgram(graph.config, "dot -Tpng -o" &
      changeFileExt(project, "png").string &
      ' ' & changeFileExt(project, "dot").string)

proc commandCheck(graph: ModuleGraph) =
  graph.config.errorMax = high(int)  # do not stop after first error
  defineSymbol(graph.config.symbols, "nimcheck")
  semanticPasses(graph)  # use an empty backend for semantic checking only
  compileProject(graph)

when not defined(leanCompiler):
  proc commandDoc2(graph: ModuleGraph; json: bool) =
    graph.config.errorMax = high(int)  # do not stop after first error
    semanticPasses(graph)
    if json: registerPass(graph, docgen2JsonPass)
    else: registerPass(graph, docgen2Pass)
    compileProject(graph)
    finishDoc2Pass(graph.config.projectName)

proc commandCompileToC(graph: ModuleGraph) =
  let conf = graph.config
  extccomp.initVars(conf)
  semanticPasses(graph)
  registerPass(graph, cgenPass)

  compileProject(graph)
  if graph.config.errorCounter > 0:
    return # issue #9933
  cgenWriteModules(graph.backend, conf)
  if conf.cmd != cmdRun:
    let proj = changeFileExt(conf.projectFull, "")
    extccomp.callCCompiler(conf, proj)
    extccomp.writeJsonBuildInstructions(conf, proj)
    if optGenScript in graph.config.globalOptions:
      writeDepsFile(graph, toGeneratedFile(conf, proj, ""))

proc commandJsonScript(graph: ModuleGraph) =
  let proj = changeFileExt(graph.config.projectFull, "")
  extccomp.runJsonBuildInstructions(graph.config, proj)

when not defined(leanCompiler):
  proc commandCompileToJS(graph: ModuleGraph) =
    #incl(gGlobalOptions, optSafeCode)
    setTarget(graph.config.target, osJS, cpuJS)
    #initDefines()
    defineSymbol(graph.config.symbols, "ecmascript") # For backward compatibility
    defineSymbol(graph.config.symbols, "js")
    semanticPasses(graph)
    registerPass(graph, JSgenPass)
    compileProject(graph)

proc interactivePasses(graph: ModuleGraph) =
  initDefines(graph.config.symbols)
  defineSymbol(graph.config.symbols, "nimscript")
  when hasFFI: defineSymbol(graph.config.symbols, "nimffi")
  registerPass(graph, verbosePass)
  registerPass(graph, semPass)
  registerPass(graph, evalPass)

proc commandInteractive(graph: ModuleGraph) =
  graph.config.errorMax = high(int)  # do not stop after first error
  interactivePasses(graph)
  compileSystemModule(graph)
  if graph.config.commandArgs.len > 0:
    discard graph.compileModule(fileInfoIdx(graph.config, graph.config.projectFull), {})
  else:
    var m = graph.makeStdinModule()
    incl(m.flags, sfMainModule)
    processModule(graph, m, llStreamOpenStdIn())

const evalPasses = [verbosePass, semPass, evalPass]

proc evalNim(graph: ModuleGraph; nodes: PNode, module: PSym) =
  carryPasses(graph, nodes, module, evalPasses)

proc commandEval(graph: ModuleGraph; exp: string) =
  if graph.systemModule == nil:
    interactivePasses(graph)
    compileSystemModule(graph)
  let echoExp = "echo \"eval\\t\", " & "repr(" & exp & ")"
  evalNim(graph, echoExp.parseString(graph.cache, graph.config),
    makeStdinModule(graph))

proc commandScan(cache: IdentCache, config: ConfigRef) =
  var f = addFileExt(AbsoluteFile mainCommandArg(config), NimExt)
  var stream = llStreamOpen(f, fmRead)
  if stream != nil:
    var
      L: TLexer
      tok: TToken
    initToken(tok)
    openLexer(L, f, stream, cache, config)
    while true:
      rawGetTok(L, tok)
      printTok(config, tok)
      if tok.tokType == tkEof: break
    closeLexer(L)
  else:
    rawMessage(config, errGenerated, "cannot open file: " & f.string)

const
  PrintRopeCacheStats = false

proc mainCommand*(graph: ModuleGraph) =
  let conf = graph.config
  let cache = graph.cache

  setupModuleCache(graph)
  # In "nim serve" scenario, each command must reset the registered passes
  clearPasses(graph)
  conf.lastCmdTime = epochTime()
  conf.searchPaths.add(conf.libpath)
  setId(100)
  case conf.command.normalize
  of "c", "cc", "compile", "compiletoc":
    # compile means compileToC currently
    conf.cmd = cmdCompileToC
    defineSymbol(graph.config.symbols, "c")
    commandCompileToC(graph)
  of "cpp", "compiletocpp":
    conf.cmd = cmdCompileToCpp
    defineSymbol(graph.config.symbols, "cpp")
    commandCompileToC(graph)
  of "objc", "compiletooc":
    conf.cmd = cmdCompileToOC
    defineSymbol(graph.config.symbols, "objc")
    commandCompileToC(graph)
  of "run":
    conf.cmd = cmdRun
    when hasTinyCBackend:
      extccomp.setCC("tcc")
      commandCompileToC(graph)
    else:
      rawMessage(conf, errGenerated, "'run' command not available; rebuild with -d:tinyc")
  of "js", "compiletojs":
    when defined(leanCompiler):
      quit "compiler wasn't built with JS code generator"
    else:
      conf.cmd = cmdCompileToJS
      commandCompileToJS(graph)
  of "doc0":
    when defined(leanCompiler):
      quit "compiler wasn't built with documentation generator"
    else:
      wantMainModule(conf)
      conf.cmd = cmdDoc
      loadConfigs(DocConfig, cache, conf)
      commandDoc(cache, conf)
  of "doc2", "doc":
    when defined(leanCompiler):
      quit "compiler wasn't built with documentation generator"
    else:
      conf.cmd = cmdDoc
      loadConfigs(DocConfig, cache, conf)
      defineSymbol(conf.symbols, "nimdoc")
      commandDoc2(graph, false)
  of "rst2html":
    when defined(leanCompiler):
      quit "compiler wasn't built with documentation generator"
    else:
      conf.cmd = cmdRst2html
      loadConfigs(DocConfig, cache, conf)
      commandRst2Html(cache, conf)
  of "rst2tex":
    when defined(leanCompiler):
      quit "compiler wasn't built with documentation generator"
    else:
      conf.cmd = cmdRst2tex
      loadConfigs(DocTexConfig, cache, conf)
      commandRst2TeX(cache, conf)
  of "jsondoc0":
    when defined(leanCompiler):
      quit "compiler wasn't built with documentation generator"
    else:
      wantMainModule(conf)
      conf.cmd = cmdDoc
      loadConfigs(DocConfig, cache, conf)
      wantMainModule(conf)
      defineSymbol(conf.symbols, "nimdoc")
      commandJson(cache, conf)
  of "jsondoc2", "jsondoc":
    when defined(leanCompiler):
      quit "compiler wasn't built with documentation generator"
    else:
      conf.cmd = cmdDoc
      loadConfigs(DocConfig, cache, conf)
      wantMainModule(conf)
      defineSymbol(conf.symbols, "nimdoc")
      commandDoc2(graph, true)
  of "ctags":
    when defined(leanCompiler):
      quit "compiler wasn't built with documentation generator"
    else:
      wantMainModule(conf)
      conf.cmd = cmdDoc
      loadConfigs(DocConfig, cache, conf)
      defineSymbol(conf.symbols, "nimdoc")
      commandTags(cache, conf)
  of "buildindex":
    when defined(leanCompiler):
      quit "compiler wasn't built with documentation generator"
    else:
      conf.cmd = cmdDoc
      loadConfigs(DocConfig, cache, conf)
      commandBuildIndex(cache, conf)
  of "gendepend":
    conf.cmd = cmdGenDepend
    commandGenDepend(graph)
  of "dump":
    conf.cmd = cmdDump
    if getConfigVar(conf, "dump.format") == "json":
      wantMainModule(conf)

      var definedSymbols = newJArray()
      for s in definedSymbolNames(conf.symbols): definedSymbols.elems.add(%s)

      var libpaths = newJArray()
      for dir in conf.searchPaths: libpaths.elems.add(%dir.string)

      var hints = newJObject() # consider factoring with `listHints`
      for a in hintMin..hintMax:
        let key = lineinfos.HintsToStr[ord(a) - ord(hintMin)]
        hints[key] = %(a in conf.notes)
      var warnings = newJObject()
      for a in warnMin..warnMax:
        let key = lineinfos.WarningsToStr[ord(a) - ord(warnMin)]
        warnings[key] = %(a in conf.notes)

      var dumpdata = %[
        (key: "version", val: %VersionAsString),
        (key: "project_path", val: %conf.projectFull.string),
        (key: "defined_symbols", val: definedSymbols),
        (key: "lib_paths", val: %libpaths),
        (key: "out", val: %conf.outFile.string),
        (key: "nimcache", val: %getNimcacheDir(conf).string),
        (key: "hints", val: hints),
        (key: "warnings", val: warnings),
      ]

      msgWriteln(conf, $dumpdata, {msgStdout, msgSkipHook})
    else:
      msgWriteln(conf, "-- list of currently defined symbols --",
                 {msgStdout, msgSkipHook})
      for s in definedSymbolNames(conf.symbols): msgWriteln(conf, s, {msgStdout, msgSkipHook})
      msgWriteln(conf, "-- end of list --", {msgStdout, msgSkipHook})

      for it in conf.searchPaths: msgWriteln(conf, it.string)
  of "check":
    conf.cmd = cmdCheck
    commandCheck(graph)
  of "parse":
    conf.cmd = cmdParse
    wantMainModule(conf)
    discard parseFile(conf.projectMainIdx, cache, conf)
  of "scan":
    conf.cmd = cmdScan
    wantMainModule(conf)
    commandScan(cache, conf)
    msgWriteln(conf, "Beware: Indentation tokens depend on the parser's state!")
  of "secret":
    conf.cmd = cmdInteractive
    commandInteractive(graph)
  of "e":
    incl conf.globalOptions, optWasNimscript
    commandEval(graph, mainCommandArg(conf))
  of "nop", "help":
    # prevent the "success" message:
    conf.cmd = cmdDump
  of "jsonscript":
    conf.cmd = cmdJsonScript
    commandJsonScript(graph)
  else:
    rawMessage(conf, errGenerated, "invalid command: " & conf.command)

  if conf.errorCounter == 0 and
     conf.cmd notin {cmdInterpret, cmdRun, cmdDump}:
    when declared(system.getMaxMem):
      let usedMem = formatSize(getMaxMem()) & " peakmem"
    else:
      let usedMem = formatSize(getTotalMem())
    rawMessage(conf, hintSuccessX, [$conf.linesCompiled,
               formatFloat(epochTime() - conf.lastCmdTime, ffDecimal, 3),
               usedMem,
               if isDefined(conf, "release"): "Release Build"
               else: "Debug Build"])

  when PrintRopeCacheStats:
    echo "rope cache stats: "
    echo "  tries : ", gCacheTries
    echo "  misses: ", gCacheMisses
    echo "  int tries: ", gCacheIntTries
    echo "  efficiency: ", formatFloat(1-(gCacheMisses.float/gCacheTries.float),
                                       ffDecimal, 3)

  resetAttributes(conf)