//===- SearchDirs.cpp -----------------------------------------------------===//
//
//                     The MCLinker Project
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include <mcld/MC/SearchDirs.h>
#include <mcld/MC/MCLDDirectory.h>
#include <mcld/Support/FileSystem.h>

using namespace mcld;

//===----------------------------------------------------------------------===//
// Non-member functions
//===----------------------------------------------------------------------===//
static inline void SpecToFilename(const std::string& pSpec, std::string& pFile)
{
  pFile = "lib";
  pFile += pSpec;
}

//===----------------------------------------------------------------------===//
// SearchDirs
//===----------------------------------------------------------------------===//
SearchDirs::SearchDirs()
{
  // a magic number 8, no why.
  // please prove it or change it
  m_DirList.reserve(8);
}

SearchDirs::SearchDirs(const sys::fs::Path& pSysRoot)
  : m_SysRoot(pSysRoot) {
  // a magic number 8, no why.
  // please prove it or change it
  m_DirList.reserve(8);
}

SearchDirs::~SearchDirs()
{
  iterator dir, dirEnd = end();
  for (dir = begin(); dir!=dirEnd; ++dir) {
    delete (*dir);
  }
}

bool SearchDirs::insert(const std::string& pPath)
{
  MCLDDirectory* dir = new MCLDDirectory(pPath);
  if (dir->isInSysroot())
    dir->setSysroot(m_SysRoot);

  if (exists(dir->path()) && is_directory(dir->path())) {
    m_DirList.push_back(dir);
    return true;
  }
  return false;
}

bool SearchDirs::insert(const sys::fs::Path& pPath)
{
  return insert(pPath.native());
}

mcld::sys::fs::Path* SearchDirs::find(const std::string& pNamespec, mcld::Input::Type pType)
{
  assert(Input::DynObj == pType || Input::Archive == pType);

  std::string file;
  SpecToFilename(pNamespec, file);
  // for all MCLDDirectorys
  DirList::iterator mcld_dir, mcld_dir_end = m_DirList.end();
  for (mcld_dir=m_DirList.begin(); mcld_dir!=mcld_dir_end; ++mcld_dir) {
    // for all entries in MCLDDirectory
    MCLDDirectory::iterator entry = (*mcld_dir)->begin();
    MCLDDirectory::iterator enEnd = (*mcld_dir)->end();

    switch(pType) {
      case Input::DynObj: {
        while (entry!=enEnd) {
          if (file == entry.path()->stem().native() ) {
            if(mcld::sys::fs::detail::shared_library_extension == entry.path()->extension().native()) {
              return entry.path();
            }
          }
          ++entry;
        }
      }
      /** Fall through **/
      case Input::Archive : {
        entry = (*mcld_dir)->begin();
        enEnd = (*mcld_dir)->end();
        while ( entry!=enEnd ) {
          if (file == entry.path()->stem().native() &&
            mcld::sys::fs::detail::static_library_extension == entry.path()->extension().native()) {
            return entry.path();
          }
          ++entry;
        }
      }
      default:
        break;
    } // end of switch
  } // end of while
  return NULL;
}

const mcld::sys::fs::Path*
SearchDirs::find(const std::string& pNamespec, mcld::Input::Type pType) const
{
  assert(Input::DynObj == pType || Input::Archive == pType);

  std::string file;
  SpecToFilename(pNamespec, file);
  // for all MCLDDirectorys
  DirList::const_iterator mcld_dir, mcld_dir_end = m_DirList.end();
  for (mcld_dir=m_DirList.begin(); mcld_dir!=mcld_dir_end; ++mcld_dir) {
    // for all entries in MCLDDirectory
    MCLDDirectory::iterator entry = (*mcld_dir)->begin();
    MCLDDirectory::iterator enEnd = (*mcld_dir)->end();

    switch(pType) {
      case Input::DynObj: {
        while (entry!=enEnd) {
          if (file == entry.path()->stem().native() ) {
            if(mcld::sys::fs::detail::shared_library_extension == entry.path()->extension().native()) {
              return entry.path();
            }
          }
          ++entry;
        }
      }
      /** Fall through **/
      case Input::Archive : {
        entry = (*mcld_dir)->begin();
        enEnd = (*mcld_dir)->end();
        while ( entry!=enEnd ) {
          if (file == entry.path()->stem().native() &&
            mcld::sys::fs::detail::static_library_extension == entry.path()->extension().native()) {
            return entry.path();
          }
          ++entry;
        }
      }
      default:
        break;
    } // end of switch
  } // end of while
  return NULL;
}