#include "session.h"
#if defined(USE_BOOST_PYTHON)
#include "py_eval.h"
#endif

namespace ledger {

unsigned int session_t::read_journal(std::istream&       in,
				     journal_t *         journal,
				     account_t *	 master,
				     const string * original_file)
{
  if (! master)
    master = journal->master;

  for (std::list<parser_t *>::iterator i = parsers.begin();
       i != parsers.end();
       i++)
    if ((*i)->test(in))
      return (*i)->parse(in, journal, master, original_file);

  return 0;
}

unsigned int session_t::read_journal(const string&  path,
				     journal_t *         journal,
				     account_t *	 master,
				     const string * original_file)
{
  journal->sources.push_back(path);

  if (access(path.c_str(), R_OK) == -1)
    throw_(exception, "Cannot read file '" << path << "'");

  if (! original_file)
    original_file = &path;

  std::ifstream stream(path.c_str());
  return read_journal(stream, journal, master, original_file);
}

void session_t::read_init()
{
  if (init_file.empty())
    return;

  if (access(init_file.c_str(), R_OK) == -1)
    throw_(exception, "Cannot read init file '" << init_file << "'");

  std::ifstream init(init_file.c_str());

  // jww (2006-09-15): Read initialization options here!
}

journal_t * session_t::read_data(const string& master_account)
{
  TRACE_START(parser, 1, "Parsing journal file");

  journal_t * journal = new_journal();
  journal->document = new xml::document_t;
  journal->document->set_top(xml::wrap_node(journal->document, journal));

  unsigned int entry_count = 0;

  DEBUG_("ledger.cache", "3. use_cache = " << use_cache);

  if (use_cache && ! cache_file.empty() &&
      ! data_file.empty()) {
    DEBUG_("ledger.cache", "using_cache " << cache_file);
    cache_dirty = true;
    if (access(cache_file.c_str(), R_OK) != -1) {
      std::ifstream stream(cache_file.c_str());

      string price_db_orig = journal->price_db;
      journal->price_db = price_db;
      entry_count += read_journal(stream, journal, NULL,
					  &data_file);
      if (entry_count > 0)
	cache_dirty = false;
      else
	journal->price_db = price_db_orig;
    }
  }

  if (entry_count == 0 && ! data_file.empty()) {
    account_t * acct = NULL;
    if (! master_account.empty())
      acct = journal->find_account(master_account);

    journal->price_db = price_db;
    if (! journal->price_db.empty() &&
	access(journal->price_db.c_str(), R_OK) != -1) {
      if (read_journal(journal->price_db, journal)) {
	throw_(exception, "Entries not allowed in price history file");
      } else {
	DEBUG_("ledger.cache", "read price database " << journal->price_db);
	journal->sources.pop_back();
      }
    }

    DEBUG_("ledger.cache", "rejected cache, parsing " << data_file);
    if (data_file == "-") {
      use_cache = false;
      journal->sources.push_back("<stdin>");
      entry_count += read_journal(std::cin, journal, acct);
    }
    else if (access(data_file.c_str(), R_OK) != -1) {
      entry_count += read_journal(data_file, journal, acct);
      if (! journal->price_db.empty())
	journal->sources.push_back(journal->price_db);
    }
  }

  VERIFY(journal->valid());

  if (entry_count == 0)
    throw_(exception, "Failed to locate any journal entries; "
	   "did you specify a valid file with -f?");

  TRACE_STOP(parser, 1);

  return journal;
}

bool session_t::resolve(const string& name, value_t& result,
			xml::xpath_t::scope_t * locals)
{
  const char * p = name.c_str();
  switch (*p) {
  case 'd':
    if (name == "date_format") {
      // jww (2007-04-18): What to do here?
#if 0
      result.set_string(moment_t::output_format);
#endif
      return true;
    }
    break;

  case 'n':
    switch (*++p) {
    case 'o':
      if (name == "now") {
	result = now;
	return true;
      }
      break;
    }
    break;

  case 'r':
    if (name == "register_format") {
      result = register_format;
      return true;
    }
    break;
  }

  return xml::xpath_t::scope_t::resolve(name, result, locals);
}

xml::xpath_t::op_t * session_t::lookup(const string& name)
{
  const char * p = name.c_str();
  switch (*p) {
  case 'o':
    if (std::strncmp(p, "option_", 7) == 0) {
      p = p + 7;
      switch (*p) {
      case 'd':
	if (std::strcmp(p, "debug") == 0)
	  return MAKE_FUNCTOR(session_t, option_debug);
	break;

      case 'f':
	if (! *(p + 1) || std::strcmp(p, "file") == 0)
	  return MAKE_FUNCTOR(session_t, option_file);
	break;

      case 't':
	if (std::strcmp(p, "trace") == 0)
	  return MAKE_FUNCTOR(session_t, option_trace);
	break;

      case 'v':
	if (! *(p + 1) || std::strcmp(p, "verbose") == 0)
	  return MAKE_FUNCTOR(session_t, option_verbose);
	else if (std::strcmp(p, "verify") == 0)
	  return MAKE_FUNCTOR(session_t, option_verify);
	break;
      }
    }
    break;
  }

  return xml::xpath_t::scope_t::lookup(name);
}

// jww (2007-04-26): All of Ledger should be accessed through a
// session_t object
void initialize()
{
  IF_VERIFY()
    initialize_memory_tracing();

  amount_t::initialize();
  xml::xpath_t::initialize();
}

void shutdown()
{
#if defined(USE_BOOST_PYTHON)
  shutdown_for_python();
#endif
  xml::xpath_t::shutdown();
  amount_t::shutdown();

  IF_VERIFY() {
    INFO("Ledger shutdown (Boost/libstdc++ may still hold memory)");
    shutdown_memory_tracing();
  } else {
    INFO("Ledger shutdown");
  }
}

} // namespace ledger