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#include "base/config_file_stream.h"

#include <string.h>
#include <fstream>
#include <sstream>
#include "base/base.h"
#include "base/file_stream.h"

namespace mozc {

namespace {

static const char kSystemPrefix[] = "system://";
static const char kUserPrefix[]   = "user://";
static const char kFilePrefix[]   = "file://";

struct FileData {
  const char *name;
  const char *data;
  size_t size;
};

string RemovePrefix(const char *prefix, const string &filename) {
  const size_t size = strlen(prefix);
  if (filename.size() < size) {
    return "";
  }
  return filename.substr(size, filename.size() - size);
}

#include "base/config_file_stream_data.h"
}  // namespace

istream *ConfigFileStream::Open(const string &filename,
                                ios_base::openmode mode) {
  // system://foo.bar.txt
  if (filename.find(kSystemPrefix) == 0) {
    const string new_filename = RemovePrefix(kSystemPrefix, filename);
    for (size_t i = 0; i < arraysize(kFileData); ++i) {
      if (new_filename == kFileData[i].name) {
        istringstream *ifs = new istringstream(
            string(kFileData[i].data, kFileData[i].size), mode);
        CHECK(ifs);
        if (*ifs) {
          return ifs;
        }
        delete ifs;
        return NULL;
      }
    }
  // user://foo.bar.txt
  } else if (filename.find(kUserPrefix) == 0) {
    const string new_filename =
        Util::JoinPath(Util::GetUserProfileDirectory(),
                       RemovePrefix(kUserPrefix, filename));
    InputFileStream *ifs = new InputFileStream(new_filename.c_str(), mode);
    CHECK(ifs);
    if (*ifs) {
      return ifs;
    }
    delete ifs;
    return NULL;
  // file:///foo.map
  } else if (filename.find(kFilePrefix) == 0) {
    const string new_filename = RemovePrefix(kFilePrefix, filename);
    InputFileStream *ifs = new InputFileStream(new_filename.c_str(), mode);
    CHECK(ifs);
    if (*ifs) {
      return ifs;
    }
    delete ifs;
    return NULL;
  } else {
    LOG(WARNING) << filename << " has no prefix. open from localfile";
    InputFileStream *ifs = new InputFileStream(filename.c_str(), mode);
    CHECK(ifs);
    if (*ifs) {
      return ifs;
    }
    delete ifs;
    return NULL;
  }

  return NULL;
}

string ConfigFileStream::GetFileName(const string &filename) {
  if (filename.find(kSystemPrefix) == 0) {
    return "";
  } else if (filename.find(kUserPrefix) == 0) {
    return Util::JoinPath(Util::GetUserProfileDirectory(),
                          RemovePrefix(kUserPrefix, filename));
  } else if (filename.find(kFilePrefix) == 0) {
    return RemovePrefix(kUserPrefix, filename);
  } else {
    LOG(WARNING) << filename << " has no prefix. open from localfile";
    return filename;
  }
  return "";
}
}  // namespace mozc