/*      $OpenBSD: mach.c,v 1.23 2023/10/10 08:22:19 tb Exp $    */
/*      $NetBSD: mach.c,v 1.5 1995/04/28 22:28:48 mycroft Exp $ */

/*-
 * Copyright (c) 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Barry Brachman.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 */

/*
 * Terminal interface
 *
 * Input is raw and unechoed
 */
#include <sys/ioctl.h>

#include <ctype.h>
#include <curses.h>
#include <err.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <time.h>

#include "bog.h"
#include "extern.h"

static int ccol, crow, maxw;
static int colstarts[MAXCOLS], ncolstarts;
static char *separator;
int ncols, nlines, lastline;

/* 
 * The following determine the screen layout
 */
int PROMPT_COL  = 20;
int PROMPT_LINE = 3;

int BOARD_COL   = 0;
int BOARD_LINE  = 0;

int SCORE_COL   = 20;
int SCORE_LINE  = 0;

int LIST_COL    = 0;
int LIST_LINE   = 10;

int TIMER_COL   = 20;
int TIMER_LINE  = 2;

extern char **pword, **mword;
extern int ngames, nmwords, npwords, tnmwords, tnpwords, ncubes, grid;

static void     cont_catcher(int);
static int      prwidth(char **, int);
static void     prword(char **, int);
static void     stop_catcher(int);
static void     tty_cleanup(void);
static int      tty_setup(void);
static void     tty_showboard(char *);
static void     winch_catcher(int);

/*
 * Do system dependent initialization
 * This is called once, when the program starts
 */
int
setup(void)
{
        char *cp, *ep;

        if (tty_setup() < 0)
                return(-1);

        separator = malloc(4 * grid + 2);
        if (separator == NULL)
                err(1, NULL);

        ep = separator + 4 * grid;
        for (cp = separator; cp < ep;) {
                *cp++ = '+';
                *cp++ = '-';
                *cp++ = '-';
                *cp++ = '-';
        }
        *cp++ = '+';
        *cp = '\0';

        SCORE_COL += (grid - 4) * 4;
        TIMER_COL += (grid - 4) * 4;
        PROMPT_COL += (grid - 4) * 4;
        LIST_LINE += (grid - 4) * 2;

        return(0);
}

/*
 * Do system dependent clean up
 * This is called once, just before the program terminates
 */
void
cleanup(void)
{
        tty_cleanup();
}

/*
 * Display the player's word list, the list of words not found, and the running
 * stats
 */
void
results(void)
{
        int col, row;
        int denom1, denom2;

        move(LIST_LINE, LIST_COL);
        clrtobot();
        printw("Words you found (%d):", npwords);
        refresh();
        move(LIST_LINE + 1, LIST_COL);
        prtable(pword, npwords, 0, ncols, prword, prwidth);

        getyx(stdscr, row, col);
        move(row + 1, col);
        printw("Words you missed (%d):", nmwords);
        refresh();
        move(row + 2, col);
        prtable(mword, nmwords, 0, ncols, prword, prwidth);

        denom1 = npwords + nmwords;
        denom2 = tnpwords + tnmwords;
 
        move(SCORE_LINE, SCORE_COL);
        printw("Score: %d out of %d\n", npwords, denom1);
        move(SCORE_LINE + 1, SCORE_COL);
        printw("Percentage: %0.2f%% (%0.2f%% over %d game%s)\n",
        denom1 ? (100.0 * npwords)  / (double) denom1 : 0.0,
        denom2 ? (100.0 * tnpwords) / (double) denom2 : 0.0,
        ngames, ngames > 1 ? "s" : "");
        move(TIMER_LINE, TIMER_COL);
        wclrtoeol(stdscr);
}

static void
prword(char **base, int indx)
{
        printw("%s", base[indx]);
}

static int
prwidth(char **base, int indx)
{
        return (strlen(base[indx]));
}

/*
 * Main input routine
 *
 * - doesn't accept words longer than MAXWORDLEN or containing caps
 */
char *
get_line(char *q)
{
        int ch, done;
        char *p;
        int row, col;

        p = q;
        done = 0;
        while (!done) {
                ch = timerch();
                switch (ch) {
                case '\n':
                case '\r':
                case ' ':
                        done = 1;
                        break;
                case '\033':
                        findword();
                        break;
                case '\177':                    /* <del> */
                case '\010':                    /* <bs> */
                        if (p == q)
                                break;
                        p--;
                        getyx(stdscr, row, col);
                        move(row, col - 1);
                        clrtoeol();
                        refresh();
                        break;
                case '\025':                    /* <^u> */
                case '\027':                    /* <^w> */
                        if (p == q)
                                break;
                        getyx(stdscr, row, col);
                        move(row, col - (int) (p - q));
                        p = q;
                        clrtoeol();
                        refresh();
                        break;
#ifdef SIGTSTP
                case '\032':                    /* <^z> */
                        stop_catcher(0);
                        break;
#endif
                case '\023':                    /* <^s> */
                        stoptime();
                        printw("<PAUSE>");
                        refresh();
                        while ((ch = inputch()) != '\021' && ch != '\023')
                                ;
                        move(crow, ccol);
                        clrtoeol();
                        refresh();
                        starttime();
                        break;
                case '\003':                    /* <^c> */
                        cleanup();
                        exit(0);
                case '\004':                    /* <^d> */
                        done = 1;
                        ch = EOF;
                        break;
                case '\014':                    /* <^l> */
                case '\022':                    /* <^r> */
                        redraw();
                        break;
                case '?':
                        stoptime();
                        if (help() < 0)
                                showstr("Can't open help file", 1);
                        starttime();
                        break;
                default:
                        if (!islower(ch))
                                break;
                        if ((int) (p - q) == MAXWORDLEN) {
                                p = q;
                                badword();
                                break;
                        }
                        *p++ = ch;
                        addch(ch);
                        refresh();
                        break;
                }
        }
        *p = '\0';
        if (ch == EOF)
                return(NULL);
        return(q);
}

int
inputch(void)
{
        int ch;

        if ((ch = getch()) == ERR)
                err(1, "cannot read input");
        return (ch & 0177);
}

void
redraw(void)
{
        clearok(stdscr, 1);
        refresh();
}

void
flushin(FILE *fp)
{

        (void) tcflush(fileno(fp), TCIFLUSH);
}

static int gone;

/*
 * Stop the game timer
 */
void
stoptime(void)
{
        extern time_t start_t;
        time_t t;

        (void)time(&t);
        gone = (int) (t - start_t);
}

/*
 * Restart the game timer
 */
void
starttime(void)
{
        extern time_t start_t;
        time_t t;

        (void)time(&t);
        start_t = t - (long) gone;
}

/*
 * Initialize for the display of the player's words as they are typed
 * This display starts at (LIST_LINE, LIST_COL) and goes "down" until the last
 * line.  After the last line a new column is started at LIST_LINE
 * Keep track of each column position for showword()
 * There is no check for exceeding COLS
 */
void
startwords(void)
{
        crow = LIST_LINE;
        ccol = LIST_COL;
        maxw = 0;
        ncolstarts = 1;
        colstarts[0] = LIST_COL;
        move(LIST_LINE, LIST_COL);
        refresh();
}

/*
 * Add a word to the list and start a new column if necessary
 * The maximum width of the current column is maintained so we know where
 * to start the next column
 */
void
addword(char *w)
{
        int n;

        if (crow == lastline) {
                crow = LIST_LINE;
                ccol += (maxw + 5);
                colstarts[ncolstarts++] = ccol;
                maxw = 0;
                move(crow, ccol);
        }
        else {
                move(++crow, ccol);
                if ((n = strlen(w)) > maxw)
                        maxw = n;
        }
        refresh();
}

/*
 * The current word is unacceptable so erase it
 */
void
badword(void)
{

        move(crow, ccol);
        clrtoeol();
        refresh();
}

/*
 * Highlight the nth word in the list (starting with word 0)
 * No check for wild arg
 */
void
showword(int n)
{
        int col, row;

        row = LIST_LINE + n % (lastline - LIST_LINE + 1);
        col = colstarts[n / (lastline - LIST_LINE + 1)];
        move(row, col);
        standout();
        printw("%s", pword[n]);
        standend();
        move(crow, ccol);
        refresh();
        delay(15);
        move(row, col);
        printw("%s", pword[n]);
        move(crow, ccol);
        refresh();
}

/*
 * Walk the path of a word, refreshing the letters,
 * optionally pausing after each
 */
static void
doword(int pause, int r, int c)
{
        extern char *board;
        extern int wordpath[];
        int i, row, col;
        unsigned char ch;

        for (i = 0; wordpath[i] != -1; i++) {
                row = BOARD_LINE + (wordpath[i] / 4) * 2 + 1;
                col = BOARD_COL + (wordpath[i] % 4) * 4 + 2;
                move(row, col);
                ch = board[wordpath[i]];
                if (HISET(ch))
                        attron(A_BOLD);
                if (SEVENBIT(ch) == 'q')
                        printw("Qu");
                else
                        printw("%c", toupper(SEVENBIT(ch)));
                if (HISET(ch))
                        attroff(A_BOLD);
                if (pause) {
                        move(r, c);
                        refresh();
                        delay(5);
                }
        }
}

/*
 * Get a word from the user and check if it is in either of the two
 * word lists
 * If it's found, show the word on the board for a short time and then
 * erase the word
 *
 * Note: this function knows about the format of the board
 */
void
findword(void)
{
        int c, found, i, r;
        char buf[MAXWORDLEN + 1];
        extern int usedbits, wordpath[];
        extern char **mword, **pword;
        extern int nmwords, npwords;

        getyx(stdscr, r, c);
        getword(buf);
        found = 0;
        for (i = 0; i < npwords; i++) {
                if (strcmp(buf, pword[i]) == 0) {
                        found = 1;
                        break;
                }
        }
        if (!found) {
                for (i = 0; i < nmwords; i++) {
                        if (strcmp(buf, mword[i]) == 0) {
                                found = 1;
                                break;
                        }
                }
        }
        for (i = 0; i < MAXWORDLEN; i++)
                wordpath[i] = -1;
        usedbits = 0;
        if (!found || checkword(buf, -1, wordpath) == -1) {
                move(r, c);
                clrtoeol();
                addstr("[???]");
                refresh();
                delay(10);
                move(r, c);
                clrtoeol();
                refresh();
                return;
        }

        standout();
        doword(1, r, c);
        standend();
        doword(0, r, c);

        move(r, c);
        clrtoeol();
        refresh();
}

/*
 * Display a string at the current cursor position for the given number of secs
 */
void
showstr(char *str, int delaysecs)
{
        addstr(str);
        refresh();
        delay(delaysecs * 10);
        move(crow, ccol);
        clrtoeol();
        refresh();
}

void
putstr(char *s)
{
        addstr(s);
}

/*
 * Get a valid word and put it in the buffer
 */
void
getword(char *q)
{
        int ch, col, done, i, row;
        char *p;

        done = 0;
        i = 0;
        p = q;
        addch('[');
        refresh();
        while (!done && i < MAXWORDLEN - 1) {
                ch = inputch();
                switch (ch) {
                case '\177':                    /* <del> */
                case '\010':                    /* <bs> */
                        if (p == q)
                                break;
                        p--;
                        getyx(stdscr, row, col);
                        move(row, col - 1);
                        clrtoeol();
                        break;
                case '\025':                    /* <^u> */
                case '\027':                    /* <^w> */
                        if (p == q)
                                break;
                        getyx(stdscr, row, col);
                        move(row, col - (int) (p - q));
                        p = q;
                        clrtoeol();
                        break;
                case ' ':
                case '\n':
                case '\r':
                        done = 1;
                        break;
                case '\014':                    /* <^l> */
                case '\022':                    /* <^r> */
                        clearok(stdscr, 1);
                        refresh();
                        break;
                default:
                        if (islower(ch)) {
                                *p++ = ch;
                                addch(ch);
                                i++;
                        }
                        break;
                }
                refresh();
        }
        *p = '\0';
        addch(']');
        refresh();
}

void
showboard(char *b)
{
        tty_showboard(b);
}

void
prompt(char *mesg)
{
        move(PROMPT_LINE, PROMPT_COL);
        printw("%s", mesg);
        move(PROMPT_LINE + 1, PROMPT_COL);
        refresh();
}

static int
tty_setup(void)
{
        initscr();
        raw();
        noecho();

        /*
         * Does curses look at the winsize structure?
         * Should handle SIGWINCH ...
         */
        nlines = LINES;
        lastline = nlines - 1;
        ncols = COLS;

        signal(SIGTSTP, stop_catcher);
        signal(SIGCONT, cont_catcher);
        signal(SIGWINCH, winch_catcher);
        return(0);
}

static void
stop_catcher(int signo)
{
        sigset_t sigset, osigset;

        stoptime();
        noraw();
        echo();
        move(nlines - 1, 0);
        refresh();

        signal(SIGTSTP, SIG_DFL);
        sigemptyset(&sigset);
        sigaddset(&sigset, SIGTSTP);
        sigprocmask(SIG_UNBLOCK, &sigset, &osigset);
        kill(0, SIGTSTP);
        sigprocmask(SIG_SETMASK, &osigset, (sigset_t *)0);
        signal(SIGTSTP, stop_catcher);
}
 
static void
cont_catcher(int signo)
{
        noecho();
        raw();
        clearok(stdscr, 1);
        move(crow, ccol);
        refresh();
        starttime();
}
 
/*
 * The signal is caught but nothing is done about it...
 * It would mean reformatting the entire display
 */
static void
winch_catcher(int signo)
{
        struct winsize win;

        (void) signal(SIGWINCH, winch_catcher);
        (void) ioctl(fileno(stdout), TIOCGWINSZ, &win);
        /*
        LINES = win.ws_row;
        COLS = win.ws_col;
        */
}

static void
tty_cleanup(void)
{
        move(nlines - 1, 0);
        refresh();
        noraw();
        echo();
        endwin();
}

static void
tty_showboard(char *b)
{
        int i, line;
        char ch;

        clear();
        move(BOARD_LINE, BOARD_COL);
        line = BOARD_LINE;
        printw("%s", separator);
        move(++line, BOARD_COL);
        for (i = 0; i < ncubes; i++) {
                printw("| ");
                ch = SEVENBIT(b[i]);
                if (HISET(b[i]))
                        attron(A_BOLD);
                if (ch == 'q')
                        printw("Qu");
                else
                        printw("%c ", toupper((unsigned char)ch));
                if (HISET(b[i]))
                        attroff(A_BOLD);
                if ((i + 1) % grid == 0) {
                        printw("|");
                        move(++line, BOARD_COL);
                        printw("%s", separator);
                        move(++line, BOARD_COL);
                }
        }
        move(SCORE_LINE, SCORE_COL);
        printw("Type '?' for help");
        refresh();
}