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

#include <sstream>

#include "cmGeneratorExpression.h"
#include "cmMakefile.h"
#include "cmMessageType.h"
#include "cmPolicies.h"
#include "cmStringAlgorithms.h"
#include "cmSystemTools.h"
#include "cmTarget.h"
#include "cmTargetPropCommandBase.h"

namespace {

class TargetSourcesImpl : public cmTargetPropCommandBase
{
public:
  using cmTargetPropCommandBase::cmTargetPropCommandBase;

protected:
  void HandleInterfaceContent(cmTarget* tgt,
                              const std::vector<std::string>& content,
                              bool prepend, bool system) override
  {
    cmTargetPropCommandBase::HandleInterfaceContent(
      tgt, ConvertToAbsoluteContent(tgt, content, true), prepend, system);
  }

private:
  void HandleMissingTarget(const std::string& name) override
  {
    this->Makefile->IssueMessage(
      MessageType::FATAL_ERROR,
      cmStrCat("Cannot specify sources for target \"", name,
               "\" which is not built by this project."));
  }

  bool HandleDirectContent(cmTarget* tgt,
                           const std::vector<std::string>& content,
                           bool /*prepend*/, bool /*system*/) override
  {
    tgt->AppendProperty(
      "SOURCES", this->Join(ConvertToAbsoluteContent(tgt, content, false)));
    return true; // Successfully handled.
  }

  std::string Join(const std::vector<std::string>& content) override
  {
    return cmJoin(content, ";");
  }

  std::vector<std::string> ConvertToAbsoluteContent(
    cmTarget* tgt, const std::vector<std::string>& content,
    bool isInterfaceContent);
};

std::vector<std::string> TargetSourcesImpl::ConvertToAbsoluteContent(
  cmTarget* tgt, const std::vector<std::string>& content,
  bool isInterfaceContent)
{
  // Skip conversion in case old behavior has been explicitly requested
  if (this->Makefile->GetPolicyStatus(cmPolicies::CMP0076) ==
      cmPolicies::OLD) {
    return content;
  }

  bool changedPath = false;
  std::vector<std::string> absoluteContent;
  absoluteContent.reserve(content.size());
  for (std::string const& src : content) {
    std::string absoluteSrc;
    if (cmSystemTools::FileIsFullPath(src) ||
        cmGeneratorExpression::Find(src) == 0 ||
        (!isInterfaceContent &&
         (this->Makefile->GetCurrentSourceDirectory() ==
          tgt->GetMakefile()->GetCurrentSourceDirectory()))) {
      absoluteSrc = src;
    } else {
      changedPath = true;
      absoluteSrc =
        cmStrCat(this->Makefile->GetCurrentSourceDirectory(), '/', src);
    }
    absoluteContent.push_back(absoluteSrc);
  }

  if (!changedPath) {
    return content;
  }

  bool issueMessage = true;
  bool useAbsoluteContent = false;
  std::ostringstream e;
  switch (this->Makefile->GetPolicyStatus(cmPolicies::CMP0076)) {
    case cmPolicies::WARN:
      e << cmPolicies::GetPolicyWarning(cmPolicies::CMP0076) << "\n";
      break;
    case cmPolicies::OLD:
      issueMessage = false;
      break;
    case cmPolicies::REQUIRED_ALWAYS:
    case cmPolicies::REQUIRED_IF_USED:
      this->Makefile->IssueMessage(
        MessageType::FATAL_ERROR,
        cmPolicies::GetRequiredPolicyError(cmPolicies::CMP0076));
      break;
    case cmPolicies::NEW: {
      issueMessage = false;
      useAbsoluteContent = true;
      break;
    }
  }

  if (issueMessage) {
    if (isInterfaceContent) {
      e << "An interface source of target \"" << tgt->GetName()
        << "\" has a relative path.";
    } else {
      e << "A private source from a directory other than that of target \""
        << tgt->GetName() << "\" has a relative path.";
    }
    this->Makefile->IssueMessage(MessageType::AUTHOR_WARNING, e.str());
  }

  return useAbsoluteContent ? absoluteContent : content;
}

} // namespace

bool cmTargetSourcesCommand(std::vector<std::string> const& args,
                            cmExecutionStatus& status)
{
  return TargetSourcesImpl(status).HandleArguments(args, "SOURCES");
}