/* Distributed under the OSI-approved BSD 3-Clause License.  See accompanying
   file Copyright.txt or https://cmake.org/licensing for details.  */
#include "cmParseArgumentsCommand.h"

#include <map>
#include <set>
#include <sstream>
#include <utility>

#include <cm/string_view>

#include "cmArgumentParser.h"
#include "cmExecutionStatus.h"
#include "cmMakefile.h"
#include "cmMessageType.h"
#include "cmRange.h"
#include "cmStringAlgorithms.h"
#include "cmSystemTools.h"

static std::string EscapeArg(const std::string& arg)
{
  // replace ";" with "\;" so output argument lists will split correctly
  std::string escapedArg;
  for (char i : arg) {
    if (i == ';') {
      escapedArg += '\\';
    }
    escapedArg += i;
  }
  return escapedArg;
}

static std::string JoinList(std::vector<std::string> const& arg, bool escape)
{
  return escape ? cmJoin(cmMakeRange(arg).transform(EscapeArg), ";")
                : cmJoin(cmMakeRange(arg), ";");
}

namespace {

using options_map = std::map<std::string, bool>;
using single_map = std::map<std::string, std::string>;
using multi_map = std::map<std::string, std::vector<std::string>>;
using options_set = std::set<std::string>;

struct UserArgumentParser : public cmArgumentParser<void>
{
  template <typename T, typename H>
  void Bind(std::vector<std::string> const& names,
            std::map<std::string, T>& ref, H duplicateKey)
  {
    for (std::string const& key : names) {
      auto const it = ref.emplace(key, T{}).first;
      bool const inserted = this->cmArgumentParser<void>::Bind(
        cm::string_view(it->first), it->second);
      if (!inserted) {
        duplicateKey(key);
      }
    }
  }
};

} // namespace

static void PassParsedArguments(
  const std::string& prefix, cmMakefile& makefile, const options_map& options,
  const single_map& singleValArgs, const multi_map& multiValArgs,
  const std::vector<std::string>& unparsed,
  const options_set& keywordsMissingValues, bool parseFromArgV)
{
  for (auto const& iter : options) {
    makefile.AddDefinition(prefix + iter.first,
                           iter.second ? "TRUE" : "FALSE");
  }

  for (auto const& iter : singleValArgs) {
    if (!iter.second.empty()) {
      makefile.AddDefinition(prefix + iter.first, iter.second);
    } else {
      makefile.RemoveDefinition(prefix + iter.first);
    }
  }

  for (auto const& iter : multiValArgs) {
    if (!iter.second.empty()) {
      makefile.AddDefinition(prefix + iter.first,
                             JoinList(iter.second, parseFromArgV));
    } else {
      makefile.RemoveDefinition(prefix + iter.first);
    }
  }

  if (!unparsed.empty()) {
    makefile.AddDefinition(prefix + "UNPARSED_ARGUMENTS",
                           JoinList(unparsed, parseFromArgV));
  } else {
    makefile.RemoveDefinition(prefix + "UNPARSED_ARGUMENTS");
  }

  if (!keywordsMissingValues.empty()) {
    makefile.AddDefinition(prefix + "KEYWORDS_MISSING_VALUES",
                           cmJoin(cmMakeRange(keywordsMissingValues), ";"));
  } else {
    makefile.RemoveDefinition(prefix + "KEYWORDS_MISSING_VALUES");
  }
}

bool cmParseArgumentsCommand(std::vector<std::string> const& args,
                             cmExecutionStatus& status)
{
  // cmake_parse_arguments(prefix options single multi <ARGN>)
  //                         1       2      3      4
  // or
  // cmake_parse_arguments(PARSE_ARGV N prefix options single multi)
  if (args.size() < 4) {
    status.SetError("must be called with at least 4 arguments.");
    return false;
  }

  auto argIter = args.begin();
  auto argEnd = args.end();
  bool parseFromArgV = false;
  unsigned long argvStart = 0;
  if (*argIter == "PARSE_ARGV") {
    if (args.size() != 6) {
      status.GetMakefile().IssueMessage(
        MessageType::FATAL_ERROR,
        "PARSE_ARGV must be called with exactly 6 arguments.");
      cmSystemTools::SetFatalErrorOccured();
      return true;
    }
    parseFromArgV = true;
    argIter++; // move past PARSE_ARGV
    if (!cmStrToULong(*argIter, &argvStart)) {
      status.GetMakefile().IssueMessage(MessageType::FATAL_ERROR,
                                        "PARSE_ARGV index '" + *argIter +
                                          "' is not an unsigned integer");
      cmSystemTools::SetFatalErrorOccured();
      return true;
    }
    argIter++; // move past N
  }
  // the first argument is the prefix
  const std::string prefix = (*argIter++) + "_";

  UserArgumentParser parser;

  // define the result maps holding key/value pairs for
  // options, single values and multi values
  options_map options;
  single_map singleValArgs;
  multi_map multiValArgs;

  // anything else is put into a vector of unparsed strings
  std::vector<std::string> unparsed;

  auto const duplicateKey = [&status](std::string const& key) {
    status.GetMakefile().IssueMessage(
      MessageType::WARNING, "keyword defined more than once: " + key);
  };

  // the second argument is a (cmake) list of options without argument
  std::vector<std::string> list = cmExpandedList(*argIter++);
  parser.Bind(list, options, duplicateKey);

  // the third argument is a (cmake) list of single argument options
  list.clear();
  cmExpandList(*argIter++, list);
  parser.Bind(list, singleValArgs, duplicateKey);

  // the fourth argument is a (cmake) list of multi argument options
  list.clear();
  cmExpandList(*argIter++, list);
  parser.Bind(list, multiValArgs, duplicateKey);

  list.clear();
  if (!parseFromArgV) {
    // Flatten ;-lists in the arguments into a single list as was done
    // by the original function(CMAKE_PARSE_ARGUMENTS).
    for (; argIter != argEnd; ++argIter) {
      cmExpandList(*argIter, list);
    }
  } else {
    // in the PARSE_ARGV move read the arguments from ARGC and ARGV#
    std::string argc = status.GetMakefile().GetSafeDefinition("ARGC");
    unsigned long count;
    if (!cmStrToULong(argc, &count)) {
      status.GetMakefile().IssueMessage(MessageType::FATAL_ERROR,
                                        "PARSE_ARGV called with ARGC='" +
                                          argc +
                                          "' that is not an unsigned integer");
      cmSystemTools::SetFatalErrorOccured();
      return true;
    }
    for (unsigned long i = argvStart; i < count; ++i) {
      std::ostringstream argName;
      argName << "ARGV" << i;
      const char* arg = status.GetMakefile().GetDefinition(argName.str());
      if (!arg) {
        status.GetMakefile().IssueMessage(MessageType::FATAL_ERROR,
                                          "PARSE_ARGV called with " +
                                            argName.str() + " not set");
        cmSystemTools::SetFatalErrorOccured();
        return true;
      }
      list.emplace_back(arg);
    }
  }

  std::vector<std::string> keywordsMissingValues;

  parser.Parse(list, &unparsed, &keywordsMissingValues);

  PassParsedArguments(
    prefix, status.GetMakefile(), options, singleValArgs, multiValArgs,
    unparsed,
    options_set(keywordsMissingValues.begin(), keywordsMissingValues.end()),
    parseFromArgV);

  return true;
}