/*
 * Copyright (c) 2003-2007, John Wiegley.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of New Artisans LLC nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "utils.h"
#include "option.h"
#if defined(HAVE_EXPAT) || defined(HAVE_XMLPARSE)
#include "gnucash.h"
#endif
#include "qif.h"
#include "ofx.h"

#include <ledger.h>

#ifdef HAVE_UNIX_PIPES
#include <sys/types.h>
#include <sys/wait.h>
#include <fdstream.hpp>
#endif

static int read_and_report(ledger::report_t& report, int argc, char * argv[],
			   char * envp[])
{
  using namespace ledger;

  session_t& session(report.session);

  // Handle the command-line arguments

  strings_list args;
  process_arguments(argc - 1, argv + 1, false, report, args);

  if (args.empty()) {
#if 0
    help(std::cerr);
#endif
    return 1;
  }
  strings_list::iterator arg = args.begin();

  if (! session.cache_file)
    session.use_cache = false;
  else
    session.use_cache = ! session.data_file.empty() && session.price_db;

  DEBUG("ledger.session.cache", "1. use_cache = " << session.use_cache);

  // Process the environment settings

  TRACE_START(environment, 1, "Processed environment variables");
  process_environment(const_cast<const char **>(envp), "LEDGER_", report);
  TRACE_FINISH(environment, 1);

  optional<path> home;
  if (const char * home_var = std::getenv("HOME"))
    home = home_var;

  if (! session.init_file)
    session.init_file  = home ? *home / ".ledgerrc" : "./.ledgerrc";
  if (! session.price_db)
    session.price_db   = home ? *home / ".pricedb" : "./.pricedb";

  if (! session.cache_file)
    session.cache_file = home ? *home / ".ledger-cache" : "./.ledger-cache";

  if (session.data_file == *session.cache_file)
    session.use_cache = false;

  DEBUG("ledger.session.cache", "2. use_cache = " << session.use_cache);

  INFO("Initialization file is " << session.init_file->string());
  INFO("Price database is " << session.price_db->string());
  INFO("Binary cache is " << session.cache_file->string());
  INFO("Journal file is " << session.data_file.string());

  if (! session.use_cache)
    INFO("Binary cache mechanism will not be used");

  // Configure the output stream

#ifdef HAVE_UNIX_PIPES
  int status, pfd[2];		// Pipe file descriptors
#endif
  std::ostream * out = &std::cout;

  if (report.output_file) {
    out = new ofstream(*report.output_file);
  }
#ifdef HAVE_UNIX_PIPES
  else if (report.pager) {
    status = pipe(pfd);
    if (status == -1)
      throw_(std::logic_error, "Failed to create pipe");

    status = fork();
    if (status < 0) {
      throw_(std::logic_error, "Failed to fork child process");
    }
    else if (status == 0) {	// child
      // Duplicate pipe's reading end into stdin
      status = dup2(pfd[0], STDIN_FILENO);
      if (status == -1)
	perror("dup2");

      // Close unuseful file descriptors: the pipe's writing and
      // reading ends (the latter is not needed anymore, after the
      // duplication).
      close(pfd[1]);
      close(pfd[0]);

      // Find command name: its the substring starting right of the
      // rightmost '/' character in the pager pathname.  See manpage
      // for strrchr.
      execlp(report.pager->native_file_string().c_str(),
	     basename(*report.pager).c_str(), (char *)0);
      perror("execl");
      exit(1);
    }
    else {			// parent
      close(pfd[0]);
      out = new boost::fdostream(pfd[1]);
    }
  }
#endif

  // Read the command word and create a command object based on it

  string verb = *arg++;

  if (verb == "parse") {
    value_expr expr(*arg);

#if 0
    expr::context_scope_t doc_scope(report, &temp);

    IF_INFO() {
      std::cout << "Value expression tree:" << std::endl;
      expr.dump(std::cout);
      std::cout << std::endl;

      std::cout << "Value expression parsed was:" << std::endl;
      expr.print(std::cout, doc_scope);
      std::cout << std::endl << std::endl;

      expr.compile(doc_scope);

      std::cout << "Value expression after compiling:" << std::endl;
      expr.dump(std::cout);
      std::cout << std::endl;

      std::cout << "Value expression is now:" << std::endl;
      expr.print(std::cout, doc_scope);
      std::cout << std::endl << std::endl;

      std::cout << "Result of calculation: ";
    }

    std::cout << expr.calc(doc_scope).strip_annotations() << std::endl;
#endif

    return 0;
  }

  // Parse the initialization file, which can only be textual; then
  // parse the journal data.

  session.read_init();

  INFO_START(journal, "Read journal file");

  journal_t& journal(*session.create_journal());

  std::size_t count = session.read_data(journal, report.account);
  if (count == 0)
    throw_(parse_error, "Failed to locate any journal entries; "
	   "did you specify a valid file with -f?");

  INFO_FINISH(journal);

  INFO("Found " << count << " entries");

  TRACE_FINISH(entry_text, 1);
  TRACE_FINISH(entry_date, 1);
  TRACE_FINISH(entry_details, 1);
  TRACE_FINISH(entry_xacts, 1);
  TRACE_FINISH(entries, 1);
  TRACE_FINISH(parsing_total, 1);

  // Are we handling the expr commands?  Do so now.

  if (verb == "expr") {
    value_expr expr(*arg);

    IF_INFO() {
#if 0
      *out << "Value expression tree:" << std::endl;
      expr.dump(*out);
      *out << std::endl;
      *out << "Value expression parsed was:" << std::endl;
      expr.print(*out, doc_scope);
      *out << std::endl << std::endl;
      *out << "Result of calculation: ";
#endif
    }

#if 0
    *out << expr.calc(doc_scope).strip_annotations() << std::endl;
#endif

    return 0;
  }

  // Read the command word and create a command object based on it

  if (verb == "register" || verb == "reg" || verb == "r")
    report.transactions_report
      (xact_handler_ptr(new format_transactions(*out, session.register_format)));
  else if (verb == "balance" || verb == "bal" || verb == "b")
    report.accounts_report
      (acct_handler_ptr(new format_accounts(*out, session.balance_format,
					    report.display_predicate)));
#if 0
  else if (verb == "print" || verb == "p")
    command = print_command();
  else if (verb == "equity")
    command = equity_command();
  else if (verb == "entry")
    command = entry_command();
  else if (verb == "dump")
    command = dump_command();
  else if (verb == "output")
    command = output_command();
  else if (verb == "prices")
    command = prices_command();
  else if (verb == "pricesdb")
    command = pricesdb_command();
  else if (verb == "csv")
    command = csv_command();
  else if (verb == "emacs" || verb == "lisp")
    command = emacs_command();
  else if (verb == "xml")
    command = bind(xml_command, _1);
  ;
  else if (verb == "expr")
    ;
  else if (verb == "xpath")
    ;
  else {
    char buf[128];
    std::strcpy(buf, "command_");
    std::strcat(buf, verb.c_str());

    if (expr::ptr_op_t def = report.lookup(buf))
      command = def->as_function();

    if (! command)
      throw_(std::logic_error, string("Unrecognized command '") + verb + "'");
  }

  // Create an argument scope containing the report command's
  // arguments, and then invoke the command.

  expr::call_scope_t command_args(report);

  for (strings_list::iterator i = arg; i != args.end(); i++)
    command_args.push_back(value_t(*i, true));

  INFO_START(command, "Did user command '" << verb << "'");

  command(command_args);

  INFO_FINISH(command);
#endif

  // Clean up memory, if it matters

  if (DO_VERIFY() && report.output_file)
    checked_delete(out);

  // Write out the binary cache, if need be

  if (session.use_cache && session.cache_dirty && session.cache_file) {
    TRACE_START(binary_cache, 1, "Wrote binary journal file");

    ofstream stream(*session.cache_file);
    binary::write_journal(stream, journal);

    TRACE_FINISH(binary_cache, 1);
  }

  // If the user specified a pager, wait for it to exit now

#ifdef HAVE_UNIX_PIPES
  if (! report.output_file && report.pager) {
    checked_delete(out);
    close(pfd[1]);

    // Wait for child to finish
    wait(&status);
    if (status & 0xffff != 0)
      throw_(std::logic_error, "Something went wrong in the pager");
  }
#endif
  else if (DO_VERIFY() && report.output_file) {
    checked_delete(out);
  }

  return 0;
}

int main(int argc, char * argv[], char * envp[])
{
  int status = 1;

  for (int i = 1; i < argc; i++)
    if (argv[i][0] == '-') {
      if (std::strcmp(argv[i], "--verify") == 0) {
#if defined(VERIFY_ON)
	ledger::verify_enabled = true;
#endif
      }
      else if (std::strcmp(argv[i], "--verbose") == 0 ||
	       std::strcmp(argv[i], "-v") == 0) {
#if defined(LOGGING_ON)
	ledger::_log_level    = ledger::LOG_INFO;
#endif
      }
      else if (i + 1 < argc && std::strcmp(argv[i], "--debug") == 0) {
#if defined(DEBUG_ON)
	ledger::_log_level    = ledger::LOG_DEBUG;
	ledger::_log_category = argv[i + 1];
	i++;
#endif
      }
      else if (i + 1 < argc && std::strcmp(argv[i], "--trace") == 0) {
#if defined(TRACING_ON)
	ledger::_log_level   = ledger::LOG_TRACE;
	try {
	  ledger::_trace_level = boost::lexical_cast<int>(argv[i + 1]);
	}
	catch (const boost::bad_lexical_cast& e) {
	  std::cerr << "Argument to --trace must be an integer."
		    << std::endl;
	  return 1;
	}
	i++;
#endif
      }
    }

  IF_VERIFY()
    ledger::initialize_memory_tracing();

  try {
    std::ios::sync_with_stdio(false);

    boost::filesystem::path::default_name_check
      (boost::filesystem::portable_posix_name);

    INFO("Ledger starting");

    std::auto_ptr<ledger::session_t> session(new ledger::session_t);

    ledger::set_session_context(session.get());

    session->register_parser(new ledger::binary_parser_t);
#if defined(HAVE_EXPAT) || defined(HAVE_XMLPARSE)
    session->register_parser(new ledger::xml_parser_t);
    session->register_parser(new ledger::gnucash_parser_t);
#endif
#ifdef HAVE_LIBOFX
    session->register_parser(new ledger::ofx_parser_t);
#endif
    session->register_parser(new ledger::qif_parser_t);
    session->register_parser(new ledger::textual_parser_t);

    std::auto_ptr<ledger::report_t> report(new ledger::report_t(*session.get()));

    status = read_and_report(*report.get(), argc, argv, envp);

    if (DO_VERIFY()) {
      ledger::set_session_context();
    } else {
      report.release();
      session.release();
    }
  }
  catch (ledger::error * err) {
    std::cout.flush();
    // Push a null here since there's no file context
    if (err->context.empty() ||
	! dynamic_cast<ledger::xact_context *>(err->context.front()))
      err->context.push_front(new ledger::error_context(""));
    err->reveal_context(std::cerr, "Error");
    std::cerr << err->what() << std::endl;
    ledger::checked_delete(err);
  }
  catch (ledger::fatal * err) {
    std::cout.flush();
    // Push a null here since there's no file context
    if (err->context.empty() ||
	! dynamic_cast<ledger::xact_context *>(err->context.front()))
      err->context.push_front(new ledger::error_context(""));
    err->reveal_context(std::cerr, "Fatal");
    std::cerr << err->what() << std::endl;
    ledger::checked_delete(err);
  }
  catch (const std::exception& err) {
    std::cout.flush();
    std::cerr << "Exception: " << err.what() << std::endl;
  }
  catch (int _status) {
    status = _status;
  }

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

  return status;
}

// main.cc ends here.