/*

     File: AVVideoWall+TerminalIO.m

 Abstract: An AVVideoWall category, responsible for setting up terminal I/O for the command line application

  Version: 1.1

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 */

#import "AVVideoWall+TerminalIO.h"

#include <termios.h>

@implementation AVVideoWall (TerminalIO)

struct termios  termsettings_orig;

struct termios  termsettings_cbreak;

static void restoreTermIOState(void)

{

    tcsetattr(0, TCSANOW, &termsettings_orig);

}

static void signalHandler(int sig)

{

    restoreTermIOState();

}

- (BOOL)run

{

    __block  BOOL quit = NO;

    dispatch_queue_t keyboardInputQueue = dispatch_queue_create("keyboard input queue", DISPATCH_QUEUE_SERIAL);

    // Start running the capture session

    [_session startRunning];

    dispatch_async(keyboardInputQueue, ^(void) {

        atexit(restoreTermIOState);

        signal(SIGHUP, signalHandler);

        signal(SIGINT, signalHandler);

        // stash current termios state, switch to cbreak mode

        tcgetattr(0, &termsettings_orig);

        termsettings_cbreak = termsettings_orig;

        termsettings_cbreak.c_lflag &= ~(ICANON | ECHO); // non-canonical mode, disable echo

        termsettings_cbreak.c_cc[VTIME] = 0; // tenths of seconds between bytes

        termsettings_cbreak.c_cc[VMIN] = 1; // num of chars received before returning

        tcsetattr(0, TCSANOW, &termsettings_cbreak);

        while ( !quit ) {

            int curChar = getchar();

            switch (curChar) {

                case ' ':

                    // If the layers are flying around

                    if ( _spinningLayers ) {

                        dispatch_async(dispatch_get_main_queue(), ^(void) {

                            _spinningLayers = NO;

                            // Reset the layers

                            [self sendLayersHome];

                        });

                    }

                    // If the layers are at their initial positions

                    else {

                        dispatch_async(dispatch_get_main_queue(), ^(void) {

                            _spinningLayers = YES;

                            // Spin the layers

                            [self spinLayers];

                        });

                    }

                    break;

                case 'q':

                case 'Q':

                    quit = YES;

                    break;

                default:

                    break;

            }

        }

    });

    while ( !quit ) {

        NSDate* halfASecondFromNow = [[NSDate alloc] initWithTimeIntervalSinceNow:.5];

        [[NSRunLoop currentRunLoop] runUntilDate:halfASecondFromNow];

        [halfASecondFromNow release];

        halfASecondFromNow = nil;

    }

    NSLog(@"Quitting");

    // Stop running the capture session

    [_session stopRunning];

    dispatch_release(keyboardInputQueue);

    return YES;

}

@end