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/*
 * $Id: test_instr.c,v 1.9 2017/09/06 09:27:45 tom Exp $
 *
 * Author: Thomas E Dickey
 *
 * Demonstrate the instr functions from the curses library.

       int instr(char *str);
       int innstr(char *str, int n);
       int winstr(WINDOW *win, char *str);
       int winnstr(WINDOW *win, char *str, int n);
       int mvinstr(int y, int x, char *str);
       int mvinnstr(int y, int x, char *str, int n);
       int mvwinstr(WINDOW *win, int y, int x, char *str);
       int mvwinnstr(WINDOW *win, int y, int x, char *str, int n);
 */

#include <test.priv.h>

#define BASE_Y 6
#define MAX_COLS 1024

static bool
Quit(int ch)
{
    return (ch == ERR || ch == 'q' || ch == QUIT || ch == ESCAPE);
}

static void
show_1st(WINDOW *win, int line, char *buffer)
{
    MvWAddStr(win, line, 5, buffer);
}

static void
showmore(WINDOW *win, int line, char *buffer)
{
    wmove(win, line, 0);
    wclrtoeol(win);
    show_1st(win, line, buffer);
}

static int
recursive_test(int level, char **argv, WINDOW *chrwin, WINDOW *strwin)
{
    WINDOW *txtbox = 0;
    WINDOW *txtwin = 0;
    FILE *fp;
    int ch;
    int txt_x = 0, txt_y = 0;
    int base_y;
    int limit = getmaxx(strwin) - 5;

    char buffer[MAX_COLS];

    if (argv[level] == 0) {
	beep();
	return FALSE;
    }

    *buffer = '\0';
    if (level > 1) {
	txtbox = newwin(LINES - BASE_Y, COLS - level, BASE_Y, level);
	box(txtbox, 0, 0);
	wnoutrefresh(txtbox);

	txtwin = derwin(txtbox,
			getmaxy(txtbox) - 2,
			getmaxx(txtbox) - 2,
			1, 1);
	base_y = 0;
    } else {
	txtwin = stdscr;
	base_y = BASE_Y;
    }

    keypad(txtwin, TRUE);	/* enable keyboard mapping */
    (void) cbreak();		/* take input chars one at a time, no wait for \n */
    (void) noecho();		/* don't echo input */

    txt_y = base_y;
    txt_x = 0;
    wmove(txtwin, txt_y, txt_x);

    if ((fp = fopen(argv[level], "r")) != 0) {
	while ((ch = fgetc(fp)) != EOF) {
	    if (waddch(txtwin, UChar(ch)) != OK) {
		break;
	    }
	}
	fclose(fp);
    } else {
	wprintw(txtwin, "Cannot open:\n%s", argv[1]);
    }

    while (!Quit(ch = mvwgetch(txtwin, txt_y, txt_x))) {
	switch (ch) {
	case KEY_DOWN:
	case 'j':
	    if (txt_y < getmaxy(txtwin) - 1)
		txt_y++;
	    else
		beep();
	    break;
	case KEY_UP:
	case 'k':
	    if (txt_y > base_y)
		txt_y--;
	    else
		beep();
	    break;
	case KEY_LEFT:
	case 'h':
	    if (txt_x > 0)
		txt_x--;
	    else
		beep();
	    break;
	case KEY_RIGHT:
	case 'l':
	    if (txt_x < getmaxx(txtwin) - 1)
		txt_x++;
	    else
		beep();
	    break;
	case 'w':
	    recursive_test(level + 1, argv, chrwin, strwin);
	    if (txtbox != 0) {
		touchwin(txtbox);
		wnoutrefresh(txtbox);
	    } else {
		touchwin(txtwin);
		wnoutrefresh(txtwin);
	    }
	    break;
	case '-':
	    if (limit > 0) {
		--limit;
	    } else {
		beep();
	    }
	    break;
	case '+':
	    ++limit;
	    break;
	default:
	    beep();
	    break;
	}

	MvWPrintw(chrwin, 0, 0, "line:");
	wclrtoeol(chrwin);

	if (txtwin != stdscr) {
	    wmove(txtwin, txt_y, txt_x);

	    if (winstr(txtwin, buffer) != ERR) {
		show_1st(chrwin, 0, buffer);
	    }
	    if (mvwinstr(txtwin, txt_y, txt_x, buffer) != ERR) {
		showmore(chrwin, 1, buffer);
	    }
	} else {
	    move(txt_y, txt_x);

	    if (instr(buffer) != ERR) {
		show_1st(chrwin, 0, buffer);
	    }
	    if (mvinstr(txt_y, txt_x, buffer) != ERR) {
		showmore(chrwin, 1, buffer);
	    }
	}
	wnoutrefresh(chrwin);

	MvWPrintw(strwin, 0, 0, "%4d:", limit);
	wclrtobot(strwin);

	if (txtwin != stdscr) {
	    wmove(txtwin, txt_y, txt_x);
	    if (winnstr(txtwin, buffer, limit) != ERR) {
		show_1st(strwin, 0, buffer);
	    }

	    if (mvwinnstr(txtwin, txt_y, txt_x, buffer, limit) != ERR) {
		showmore(strwin, 1, buffer);
	    }
	} else {
	    move(txt_y, txt_x);
	    if (innstr(buffer, limit) != ERR) {
		show_1st(strwin, 0, buffer);
	    }

	    if (mvinnstr(txt_y, txt_x, buffer, limit) != ERR) {
		showmore(strwin, 1, buffer);
	    }
	}

	wnoutrefresh(strwin);
    }
    if (level > 1) {
	delwin(txtwin);
	delwin(txtbox);
    }
    return TRUE;
}

int
main(int argc, char *argv[])
{
    WINDOW *chrbox;
    WINDOW *chrwin;
    WINDOW *strwin;

    setlocale(LC_ALL, "");

    if (argc < 2) {
	fprintf(stderr, "usage: %s file\n", argv[0]);
	return EXIT_FAILURE;
    }

    initscr();

    chrbox = derwin(stdscr, BASE_Y, COLS, 0, 0);
    box(chrbox, 0, 0);
    wnoutrefresh(chrbox);

    chrwin = derwin(chrbox, 2, COLS - 2, 1, 1);
    strwin = derwin(chrbox, 2, COLS - 2, 3, 1);

    recursive_test(1, argv, chrwin, strwin);

    endwin();
    ExitProgram(EXIT_SUCCESS);
}
