/*
 * Copyright (c) 2003-2008, 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 "session.h"
#include "report.h"
#include "option.h"
#include "output.h"
#include "help.h"

#include "textual.h"
#include "qif.h"
#if defined(HAVE_EXPAT) || defined(HAVE_XMLPARSE)
#include "xml.h"
#include "gnucash.h"
#endif
#ifdef HAVE_LIBOFX
#include "ofx.h"
#endif

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

namespace ledger {
  string args_to_predicate(value_t::sequence_t::const_iterator begin,
			   value_t::sequence_t::const_iterator end)
  {
    string acct_value_expr;
    string payee_value_expr;
    string note_value_expr;

    string * value_expr;

    enum regexp_kind_t {
      ACCOUNT_REGEXP,
      PAYEE_REGEXP,
      NOTE_REGEXP
    }
    kind = ACCOUNT_REGEXP;

    value_expr = &acct_value_expr;

    for ( ; begin != end; begin++) {
      const string& arg((*begin).as_string());

      if (arg == "--") {
	kind = PAYEE_REGEXP;
	value_expr = &payee_value_expr;
      }
      else if (arg == "/") {
	kind = NOTE_REGEXP;
	value_expr = &note_value_expr;
      }
      else {
	if (! value_expr->empty())
	  *value_expr += "|";

	switch (kind) {
	case ACCOUNT_REGEXP:
	  *value_expr += "account =~ ";
	  break;
	case PAYEE_REGEXP:
	  *value_expr += "payee =~ ";
	  break;
	case NOTE_REGEXP:
	  *value_expr += "note =~ ";
	  break;
	}

	const char * p = arg.c_str();
	if (*p == '-') {
	  *value_expr += "!";
	  p++;
	}

	*value_expr += "/";
	while (*p) {
	  if (*p == '/')
	    *value_expr += "\\";
	  *value_expr += *p;
	  p++;
	}
	*value_expr += "/";
      }
    }

    string final_value_expr;

    if (! acct_value_expr.empty()) {
      if (! payee_value_expr.empty() ||
	  ! note_value_expr.empty())
	final_value_expr = string("(") + acct_value_expr + ")";
      else
	final_value_expr = acct_value_expr;
    }

    if (! payee_value_expr.empty()) {
      if (! acct_value_expr.empty())
	final_value_expr += string("&(") + payee_value_expr + ")";
      else if (! note_value_expr.empty())
	final_value_expr = string("(") + payee_value_expr + ")";
      else
	final_value_expr = payee_value_expr;
    }

    if (! note_value_expr.empty()) {
      if (! acct_value_expr.empty() ||
	  ! payee_value_expr.empty())
	final_value_expr += string("&(") + note_value_expr + ")";
      else if (acct_value_expr.empty() &&
	       payee_value_expr.empty())
	final_value_expr = note_value_expr;
    }

    DEBUG("report.predicate",
	  "Regexp predicate expression = " << final_value_expr);

    return final_value_expr;
  }

  template <class Formatter = format_xacts>
  class xacts_report
  {
    string format_name;

  public:
    xacts_report(const string& _format_name)
      : format_name(_format_name) {}

    value_t operator()(call_scope_t& args)
    {
      ptr_t<std::ostream> ostream(args, 0);
      var_t<string>       format(args, format_name);
      report_t&		  report(find_scope<report_t>(args));

      if (! report.format_string.empty())
	*format = report.format_string;

      if (! report.predicate.empty())
	report.predicate = string("(") + report.predicate + ")&";
      report.predicate +=
	args_to_predicate(++args.value().as_sequence().begin(),
			  args.value().as_sequence().end());

      report.xacts_report(xact_handler_ptr(new Formatter(*ostream,
							 *format)));
      return true;
    }
  };

  template <class Formatter = format_accounts>
  class accounts_report
  {
    string format_name;

  public:
    accounts_report(const string& _format_name)
      : format_name(_format_name) {}

    value_t operator()(call_scope_t& args)
    {
      ptr_t<std::ostream> ostream(args, 0);
      var_t<string>       format(args, format_name);

      find_scope<report_t>(args).accounts_report
	(acct_handler_ptr(new Formatter(*ostream, *format)));
      return true;
    }
  };

  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()) {
      ledger::help(std::cout);
      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(), NULL);
	perror("execl");
	exit(1);
      }
      else {			// parent
	close(pfd[0]);
	out = new boost::fdostream(pfd[1]);
      }
    }
#endif

    // Read the command word and see if it's any of the debugging commands
    // that Ledger supports.

    string verb = *arg++;

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

      *out << "Value expression as  input: " << *arg << std::endl;

      *out << "Value expression as parsed: ";
      expr.print(*out, report);
      *out << std::endl;

      *out << std::endl;
      *out << "--- Parsed tree ---" << std::endl;
      expr.dump(*out);

      *out << std::endl;
      *out << "--- Calculated value ---" << std::endl;
      expr.calc(report).print(*out);
      *out << std::endl;

      return 0;
    }
    else if (verb == "compile") {
      expr_t expr(*arg);

      *out << "Value expression as  input: " << *arg << std::endl;
      *out << "Value expression as parsed: ";
      expr.print(*out, report);
      *out << std::endl;

      *out << std::endl;
      *out << "--- Parsed tree ---" << std::endl;
      expr.dump(*out);

      expr.compile(report);

      *out << std::endl;
      *out << "--- Compiled tree ---" << std::endl;
      expr.dump(*out);

      *out << std::endl;
      *out << "--- Calculated value ---" << std::endl;
      expr.calc(report).print(*out);
      *out << std::endl;

      return 0;
    }
    else if (verb == "eval") {
      expr_t expr(*arg);
      *out << expr.calc(report).strip_annotations() << std::endl;
      return 0;
    }
    else if (verb == "format") {
      format_t fmt(*arg);
      fmt.dump(*out);
      return 0;
    }
    else if (verb == "period") {
      interval_t interval(*arg);

      if (! is_valid(interval.begin)) {
	*out << "Time period has no beginning." << std::endl;
      } else {
	*out << "begin: " << format_date(interval.begin) << std::endl;
	*out << "  end: " << format_date(interval.end) << std::endl;
	*out << std::endl;

	date_t date = interval.first();

	for (int i = 0; i < 20; i++) {
	  *out << std::right;
	  out->width(2);

	  *out << i << ": " << format_date(date) << std::endl;

	  date = interval.increment(date);
	  if (is_valid(interval.end) && date >= interval.end)
	    break;
	}
      }
      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);

    // Create a command object based on the command verb that was seen
    // above.

    function_t command;

    if (verb == "register" || verb == "reg" || verb == "r")
      command = xacts_report<>("register_format");
    else if (verb == "print" || verb == "p")
      command = xacts_report<>("print_format");
    else if (verb == "balance" || verb == "bal" || verb == "b")
      command = accounts_report<>("balance_format");
    else if (verb == "equity")
      command = accounts_report<format_equity>("print_format");
#if 0
    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 = xml_command();
#endif
    else {
      char buf[128];
      std::strcpy(buf, "cmd_");
      std::strcat(buf, verb.c_str());

      if (expr_t::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.

    call_scope_t command_args(report);

    command_args.push_back(value_t(out));

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

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

    command(command_args);

    INFO_FINISH(command);

#if 0
    // 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);
      journal.write(stream);

      TRACE_FINISH(binary_cache, 1);
    }
#endif

    // 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());

#if 0
    session->register_parser(new ledger::journal_t::binary_parser_t);
#endif
#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);

    session->current_report.reset(new ledger::report_t(*session.get()));

    status = read_and_report(*session->current_report.get(), argc, argv, envp);

    if (DO_VERIFY())
      ledger::set_session_context();
    else
      session.release();	// don't free anything! just let it leak
  }
  catch (const std::exception& err) {
    std::cout.flush();
    std::cerr << "Error: " << ledger::error_context() << 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.