/*
 *   libee         ASCII-Art library
 *   Copyright (c) 2002, 2003 Sam Hocevar <sam@zoy.org>
 *                 All Rights Reserved
 *
 *   $Id$
 *
 *   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 2 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, write to the Free Software
 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "config.h"

#if defined(USE_SLANG)
#   include <slang.h>
#elif defined(USE_NCURSES)
#   include <curses.h>
#elif defined(USE_CONIO)
#   include <dos.h>
#   include <conio.h>
#   if defined(SCREENUPDATE_IN_PC_H)
#       include <pc.h>
#   endif
#else
#   error "no graphics library detected"
#endif

#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/time.h>
#include <time.h>

#include "ee.h"
#include "ee_internals.h"

/* Global array with color names */
char *ee_color_names[16] =
{
    "black",
    "blue",
    "green",
    "cyan",
    "red",
    "magenta",
    "brown",
    "lightgray",
    "darkgray",
    "lightblue",
    "lightgreen",
    "lightcyan",
    "lightred",
    "lightmagenta",
    "yellow",
    "white",
};

static int _ee_delay;
char *_ee_empty_line;

#if defined(USE_NCURSES)
int _ee_attr[16];
#endif

#if defined(USE_CONIO)
static struct text_info ti;
char *_ee_screen;
#endif

int ee_init(void)
{
#if defined(USE_SLANG)
    static char *slang_colors[16] =
    {
        "black",
        "blue",
        "green",
        "cyan",
        "red",
        "magenta",
        "brown",
        "lightgray",
        "gray",
        "brightblue",
        "brightgreen",
        "brightcyan",
        "brightred",
        "brightmagenta",
        "yellow",
        "white",
    };

    int i;

    /* Initialize slang library */
    SLsig_block_signals();
    SLtt_get_terminfo();

    if(SLkp_init() == -1)
    {
        SLsig_unblock_signals();
        return -1;
    }

    SLang_init_tty(-1, 0, 1);

    if(SLsmg_init_smg() == -1)
    {
        SLsig_unblock_signals();
        return -1;
    }

    SLsig_unblock_signals();

    SLsmg_cls();
    SLtt_set_cursor_visibility(0);
    SLsmg_refresh();

    for(i = 0; i < 16; i++)
        SLtt_set_color(i + 1, NULL, slang_colors[i], "black");

#elif defined(USE_NCURSES)
    int i;

    initscr();
    keypad(stdscr, TRUE);
    nonl();
    cbreak();
    noecho();
    nodelay(stdscr, TRUE);
    curs_set(0);

    start_color();

    init_pair(1 + EE_BLACK,        COLOR_BLACK,   COLOR_BLACK);
    init_pair(1 + EE_BLUE,         COLOR_BLUE,    COLOR_BLACK);
    init_pair(1 + EE_GREEN,        COLOR_GREEN,   COLOR_BLACK);
    init_pair(1 + EE_CYAN,         COLOR_CYAN,    COLOR_BLACK);
    init_pair(1 + EE_RED,          COLOR_RED,     COLOR_BLACK);
    init_pair(1 + EE_MAGENTA,      COLOR_MAGENTA, COLOR_BLACK);
    init_pair(1 + EE_BROWN,        COLOR_YELLOW,  COLOR_BLACK);
    init_pair(1 + EE_LIGHTGRAY,    COLOR_WHITE,   COLOR_BLACK);
    init_pair(1 + EE_DARKGRAY,     COLOR_BLACK,   COLOR_BLACK);
    init_pair(1 + EE_LIGHTBLUE,    COLOR_BLUE,    COLOR_BLACK);
    init_pair(1 + EE_LIGHTGREEN,   COLOR_GREEN,   COLOR_BLACK);
    init_pair(1 + EE_LIGHTCYAN,    COLOR_CYAN,    COLOR_BLACK);
    init_pair(1 + EE_LIGHTRED,     COLOR_RED,     COLOR_BLACK);
    init_pair(1 + EE_LIGHTMAGENTA, COLOR_MAGENTA, COLOR_BLACK);
    init_pair(1 + EE_YELLOW,       COLOR_YELLOW,  COLOR_BLACK);
    init_pair(1 + EE_WHITE,        COLOR_WHITE,   COLOR_BLACK);

    for(i = 0; i < 8; i++)
    {
        _ee_attr[i] = COLOR_PAIR(1 + i);
        _ee_attr[i + 8] = A_BOLD | COLOR_PAIR(1 + i);
    }

#elif defined(USE_CONIO)
    gettextinfo(&ti);
    _ee_screen = malloc(2 * ti.screenwidth * ti.screenheight);
    if(_ee_screen == NULL)
        return -1;
    _wscroll = 0;
    _setcursortype(_NOCURSOR);
    clrscr();
#   if defined(SCREENUPDATE_IN_PC_H)
    ScreenRetrieve(_ee_screen);
#   else
    /* FIXME */
#   endif

#endif
    _ee_empty_line = malloc(ee_get_width() + 1);
    memset(_ee_empty_line, ' ', ee_get_width());
    _ee_empty_line[ee_get_width()] = '\0';

    _ee_delay = 0;

    return 0;
}

void ee_set_delay(int usec)
{
    _ee_delay = usec;
}

int ee_get_width(void)
{
#if defined(USE_SLANG)
    return SLtt_Screen_Cols;
#elif defined(USE_NCURSES)
    return COLS;
#elif defined(USE_CONIO)
    return ti.screenwidth;
#endif
}

int ee_get_height(void)
{
#if defined(USE_SLANG)
    return SLtt_Screen_Rows;
#elif defined(USE_NCURSES)
    return LINES;
#else
    return ti.screenheight;
#endif
}

#if !defined(USE_CONIO)
static int64_t local_time(void)
{
    struct timeval tv;
    int64_t now;

    gettimeofday(&tv, NULL);
    now = tv.tv_sec;
    now *= 1000000;
    now += tv.tv_usec;
    return now;
}
#endif

void ee_refresh(void)
{
#if !defined(USE_CONIO)
    static int64_t local_clock = 0;
    int64_t now;

    if(!local_clock)
    {
        /* Initialize local_clock */
        local_clock = local_time();
    }

    if(local_time() > local_clock + 10000)
    {
        /* If we are late, we shouldn't display anything */
    }
#endif

#if defined(USE_SLANG)
    SLsmg_refresh();
#elif defined(USE_NCURSES)
    refresh();
#elif defined(USE_CONIO)
#   if defined(SCREENUPDATE_IN_PC_H)
    ScreenUpdate(_ee_screen);
#   else
    /* FIXME */
#   endif
#endif

#if !defined(USE_CONIO)
    now = local_time();

    if(now < local_clock + _ee_delay - 10000)
    {
        usleep(local_clock + _ee_delay - 10000 - now);
    }

    local_clock += _ee_delay;
#else
    delay(5);
#endif
}

void ee_end(void)
{
#if defined(USE_SLANG)
    SLtt_set_cursor_visibility(1);
    SLang_reset_tty();
    SLsmg_reset_smg();
#elif defined(USE_NCURSES)
    curs_set(1);
    endwin();
#elif defined(USE_CONIO)
    _wscroll = 1;
    textcolor((enum COLORS)WHITE);
    textbackground((enum COLORS)BLACK);
    gotoxy(ee_get_width(), ee_get_height());
    cputs("\r\n");
    _setcursortype(_NORMALCURSOR);
#endif
}