///////////////////////////////////////////////////////////////
//
//	frontend.cpp
//
//	Implementation of a class that can help organize
//	a curses-based user interface.
//
//	Jeff Ondich, 6/1/03
//
///////////////////////////////////////////////////////////////

#include <curses.h>
#include <cstring>
#include <cctype>
#include "frontend.h"


FrontEnd::FrontEnd()
{
	// Set up the curses environment.
	initscr();
	raw();
	noecho();
	nonl();

	// Draw the initial screen.
	mUserText[0] = '\0';
	DrawScreen();
	refresh();
}


FrontEnd::~FrontEnd()
{
	clear();
	refresh();
	mvcur( 0, COLS - 1, LINES - 1, 0 );
	endwin();
}


// Respond to keyboard input until user types ESC.
// I'm just storing the user's string in an array (mUserText), and
// DrawScreen puts this string and its upper-case version on
// screen.  This demonstrates how to deal with keyboard input
// one character at a time.

void FrontEnd::Run()
{
	char ch;
	int n;

	while( true )
	{
		ch = getch();
		switch( ch )
		{
		case 0x1B: // the ESC character
			return;

		case 0x08:  // backspace
			n = strlen( mUserText );
			if( n > 0 )
				mUserText[n-1] = '\0';
			else
				flash();
			break;

		default:
			n = strlen( mUserText );
			if( n < kUserTextBufferSize - 1 )
			{
				mUserText[n] = ch;
				mUserText[n+1] = '\0';
			}
			else
				flash();
			break;
		}

		DrawScreen();
		refresh();
	}
}


// Put the proper characters in the proper places in the
// standard screen (stdscr).  These changes won't appear on the
// user's monitor until refresh() is called.

void FrontEnd::DrawScreen()
{
	int			i, halfHeight;
	char		str[kUserTextBufferSize];

	// Draw the lines.
	erase();
	box( stdscr, '|', '-' );
	halfHeight = LINES / 2;
	for( i=1; i < COLS - 1; i++ )
		mvaddch( halfHeight, i, '-' );

	// Draw captions and user strings.
	mvaddstr( 3, 2, "Type something here (ESC to quit)");
	mvaddstr( 5, 4, mUserText );

	mvaddstr( halfHeight + 3, 2, "Here's your text, in upper case.");
	for( i=0; mUserText[i] != '\0'; i++ )
		str[i] = toupper( mUserText[i] );
	str[i] = '\0';
	mvaddstr( halfHeight + 5, 4, str );

	// Set the cursor just beyond the input.
	move( 5, 4 + strlen(mUserText) );
}