/* GDB hooks for TUI.

   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
   2011 Free Software Foundation, Inc.

   This file is part of GDB.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include "defs.h"
#include "symtab.h"
#include "inferior.h"
#include "command.h"
#include "bfd.h"
#include "symfile.h"
#include "objfiles.h"
#include "target.h"
#include "gdbcore.h"
#include "event-loop.h"
#include "event-top.h"
#include "frame.h"
#include "breakpoint.h"
#include "ui-out.h"
#include "top.h"
#include "observer.h"
#include <unistd.h>
#include <fcntl.h>

#include "tui/tui.h"
#include "tui/tui-hooks.h"
#include "tui/tui-data.h"
#include "tui/tui-layout.h"
#include "tui/tui-io.h"
#include "tui/tui-regs.h"
#include "tui/tui-win.h"
#include "tui/tui-stack.h"
#include "tui/tui-windata.h"
#include "tui/tui-winsource.h"

#include "gdb_curses.h"

/* This redefines CTRL if it is not already defined, so it must come
   after terminal state releated include files like <term.h> and
   "gdb_curses.h".  */
#include "readline/readline.h"

int tui_target_has_run = 0;

static void
tui_new_objfile_hook (struct objfile* objfile)
{
  if (tui_active)
    tui_display_main ();
}

static int ATTRIBUTE_PRINTF (1, 0)
tui_query_hook (const char *msg, va_list argp)
{
  int retval;
  int ans2;
  int answer;

  echo ();
  while (1)
    {
      wrap_here ("");		/* Flush any buffered output.  */
      gdb_flush (gdb_stdout);

      vfprintf_filtered (gdb_stdout, msg, argp);
      printf_filtered (_("(y or n) "));

      wrap_here ("");
      gdb_flush (gdb_stdout);

      answer = tui_getc (stdin);
      clearerr (stdin);		/* in case of C-d */
      if (answer == EOF)	/* C-d */
	{
	  retval = 1;
	  break;
	}
      /* Eat rest of input line, to EOF or newline.  */
      if (answer != '\n')
	do
	  {
            ans2 = tui_getc (stdin);
	    clearerr (stdin);
	  }
	while (ans2 != EOF && ans2 != '\n' && ans2 != '\r');

      if (answer >= 'a')
	answer -= 040;
      if (answer == 'Y')
	{
	  retval = 1;
	  break;
	}
      if (answer == 'N')
	{
	  retval = 0;
	  break;
	}
      printf_filtered (_("Please answer y or n.\n"));
    }
  noecho ();
  return retval;
}

/* Prevent recursion of deprecated_register_changed_hook().  */
static int tui_refreshing_registers = 0;

static void
tui_register_changed_hook (int regno)
{
  struct frame_info *fi;

  fi = get_selected_frame (NULL);
  if (tui_refreshing_registers == 0)
    {
      tui_refreshing_registers = 1;
      tui_check_data_values (fi);
      tui_refreshing_registers = 0;
    }
}

/* Breakpoint creation hook.
   Update the screen to show the new breakpoint.  */
static void
tui_event_create_breakpoint (struct breakpoint *b)
{
  tui_update_all_breakpoint_info ();
}

/* Breakpoint deletion hook.
   Refresh the screen to update the breakpoint marks.  */
static void
tui_event_delete_breakpoint (struct breakpoint *b)
{
  tui_update_all_breakpoint_info ();
}

static void
tui_event_modify_breakpoint (struct breakpoint *b)
{
  tui_update_all_breakpoint_info ();
}

/* Called when going to wait for the target.
   Leave curses mode and setup program mode.  */
static ptid_t
tui_target_wait_hook (ptid_t pid, 
		      struct target_waitstatus *status, int options)
{
  ptid_t res;

  /* Leave tui mode (optional).  */
#if 0
  if (tui_active)
    {
      target_terminal_ours ();
      endwin ();
      target_terminal_inferior ();
    }
#endif
  tui_target_has_run = 1;
  res = target_wait (pid, status, options);

  if (tui_active)
    {
      /* TODO: need to refresh (optional).  */
    }
  return res;
}

/* The selected frame has changed.  This is happens after a target
   stop or when the user explicitly changes the frame
   (up/down/thread/...).  */
static void
tui_selected_frame_level_changed_hook (int level)
{
  struct frame_info *fi;
  CORE_ADDR pc;

  /* Negative level means that the selected frame was cleared.  */
  if (level < 0)
    return;

  fi = get_selected_frame (NULL);
  /* Ensure that symbols for this frame are read in.  Also, determine
     the source language of this frame, and switch to it if
     desired.  */
  if (get_frame_pc_if_available (fi, &pc))
    {
      struct symtab *s;

      s = find_pc_symtab (pc);
      /* elz: This if here fixes the problem with the pc not being
	 displayed in the tui asm layout, with no debug symbols.  The
	 value of s would be 0 here, and select_source_symtab would
	 abort the command by calling the 'error' function.  */
      if (s)
	select_source_symtab (s);
    }

  /* Display the frame position (even if there is no symbols or the PC
     is not known).  */
  tui_show_frame_info (fi);

  /* Refresh the register window if it's visible.  */
  if (tui_is_window_visible (DATA_WIN))
    {
      tui_refreshing_registers = 1;
      tui_check_data_values (fi);
      tui_refreshing_registers = 0;
    }
}

/* Called from print_frame_info to list the line we stopped in.  */
static void
tui_print_frame_info_listing_hook (struct symtab *s,
				   int line,
                                   int stopline, 
				   int noerror)
{
  select_source_symtab (s);
  tui_show_frame_info (get_selected_frame (NULL));
}

/* Called when the target process died or is detached.
   Update the status line.  */
static void
tui_detach_hook (void)
{
  tui_show_frame_info (0);
  tui_display_main ();
}

/* Observers created when installing TUI hooks.  */
static struct observer *tui_bp_created_observer;
static struct observer *tui_bp_deleted_observer;
static struct observer *tui_bp_modified_observer;

/* Install the TUI specific hooks.  */
void
tui_install_hooks (void)
{
  deprecated_target_wait_hook = tui_target_wait_hook;
  deprecated_selected_frame_level_changed_hook
    = tui_selected_frame_level_changed_hook;
  deprecated_print_frame_info_listing_hook
    = tui_print_frame_info_listing_hook;

  deprecated_query_hook = tui_query_hook;

  /* Install the event hooks.  */
  tui_bp_created_observer
    = observer_attach_breakpoint_created (tui_event_create_breakpoint);
  tui_bp_deleted_observer
    = observer_attach_breakpoint_deleted (tui_event_delete_breakpoint);
  tui_bp_modified_observer
    = observer_attach_breakpoint_modified (tui_event_modify_breakpoint);

  deprecated_register_changed_hook = tui_register_changed_hook;
  deprecated_detach_hook = tui_detach_hook;
}

/* Remove the TUI specific hooks.  */
void
tui_remove_hooks (void)
{
  deprecated_target_wait_hook = 0;
  deprecated_selected_frame_level_changed_hook = 0;
  deprecated_print_frame_info_listing_hook = 0;
  deprecated_query_hook = 0;
  deprecated_register_changed_hook = 0;
  deprecated_detach_hook = 0;

  /* Remove our observers.  */
  observer_detach_breakpoint_created (tui_bp_created_observer);
  tui_bp_created_observer = NULL;
  observer_detach_breakpoint_deleted (tui_bp_deleted_observer);
  tui_bp_deleted_observer = NULL;
  observer_detach_breakpoint_modified (tui_bp_modified_observer);
  tui_bp_modified_observer = NULL;
}

void _initialize_tui_hooks (void);

void
_initialize_tui_hooks (void)
{
  /* Install the permanent hooks.  */
  observer_attach_new_objfile (tui_new_objfile_hook);
}