/*

    Copyright (C) 2016 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    View controller to allow transferring data to and from an accessory form the UI.

 */

#import "EADSessionTransferViewController.h"

#import "EADSessionController.h"

@interface EADSessionTransferViewController ()

@property(nonatomic) uint32_t totalBytesRead;

@property(nonatomic, strong) IBOutlet EAAccessory *accessory;

@property(nonatomic, strong) IBOutlet UILabel *receivedBytesCountLabel;

@property(nonatomic, strong) IBOutlet UITextField *stringToSendText;

@property(nonatomic, strong) IBOutlet UITextField *hexToSendText;

@end

@implementation EADSessionTransferViewController

// send test string to the accessory

- (IBAction)sendStringButtonPressed:(id)sender;

{

    if ([_stringToSendText isFirstResponder]) {

        [_stringToSendText resignFirstResponder];

    }

    const char *buf = [[_stringToSendText text] UTF8String];

    if (buf)

    {

        uint32_t len = (uint32_t)strlen(buf) + 1;

        [[EADSessionController sharedController] writeData:[NSData dataWithBytes:buf length:len]];

    }

}

// Interpret a UITextField's string at a sequence of hex bytes and send those bytes to the accessory

- (IBAction)sendHexButtonPressed:(id)sender;

{

    if ([_hexToSendText isFirstResponder]) {

        [_hexToSendText resignFirstResponder];

    }

    const char *buf = [[_hexToSendText text] UTF8String];

    NSMutableData *data = [NSMutableData data];

    if (buf)

    {

        uint32_t len = (uint32_t)strlen(buf);

        char singleNumberString[3] = {'\0', '\0', '\0'};

        uint32_t singleNumber = 0;

        for(uint32_t i = 0 ; i < len; i+=2)

        {

            if ( ((i+1) < len) && isxdigit(buf[i]) && (isxdigit(buf[i+1])) )

            {

                singleNumberString[0] = buf[i];

                singleNumberString[1] = buf[i + 1];

                sscanf(singleNumberString, "%x", &singleNumber);

                uint8_t tmp = (uint8_t)(singleNumber & 0x000000FF);

                [data appendBytes:(void *)(&tmp) length:1];

            }

            else

            {

                break;

            }

        }

        [[EADSessionController sharedController] writeData:data];

    }

}

// send 10K of data to the accessory.

- (IBAction)send10KButtonPressed:(id)sender

{

#define STRESS_TEST_BYTE_COUNT 10000

    NSLog(@"send10KButtonPressed");

    uint8_t buf[STRESS_TEST_BYTE_COUNT];

    for(int i = 0; i < STRESS_TEST_BYTE_COUNT; i++) {

        buf[i] = (i & 0xFF);  // fill buf with incrementing bytes;

    }

    [[EADSessionController sharedController] writeData:[NSData dataWithBytes:buf length:STRESS_TEST_BYTE_COUNT]];

}

#pragma mark UIViewController

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    // watch for the accessory being disconnected

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_accessoryDidDisconnect:) name:EAAccessoryDidDisconnectNotification object:nil];

    // watch for received data from the accessory

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(_sessionDataReceived:) name:EADSessionDataReceivedNotification object:nil];

    EADSessionController *sessionController = [EADSessionController sharedController];

    _accessory = [sessionController accessory];

    [self setTitle:[sessionController protocolString]];

    [sessionController openSession];

    _totalBytesRead = 0;

}

- (void)viewWillDisappear:(BOOL)animated

{

    [super viewWillDisappear:animated];

    // remove the observers

    [[NSNotificationCenter defaultCenter] removeObserver:self name:EAAccessoryDidConnectNotification object:nil];

    [[NSNotificationCenter defaultCenter] removeObserver:self name:EADSessionDataReceivedNotification object:nil];

    EADSessionController *sessionController = [EADSessionController sharedController];

    [sessionController closeSession];

//    _accessory = nil;

}

- (void)viewDidUnload

{

    [super viewDidUnload];

}

#pragma mark UITextFieldDelegate

- (BOOL)textFieldShouldReturn:(UITextField *)textField

{

    [textField resignFirstResponder];

    return YES;

}

#pragma mark Internal

- (void)_accessoryDidDisconnect:(NSNotification *)notification

{

    if ([[self navigationController] topViewController] == self)

    {

        EAAccessory *disconnectedAccessory = [[notification userInfo] objectForKey:EAAccessoryKey];

        if ([disconnectedAccessory connectionID] == [_accessory connectionID])

        {

            [[self navigationController] popViewControllerAnimated:YES];

        }

    }

}

// Data was received from the accessory, real apps should do something with this data but currently:

//    1. bytes counter is incremented

//    2. bytes are read from the session controller and thrown away

- (void)_sessionDataReceived:(NSNotification *)notification

{

    EADSessionController *sessionController = (EADSessionController *)[notification object];

    uint32_t bytesAvailable = 0;

    while ((bytesAvailable = (uint32_t)[sessionController readBytesAvailable]) > 0) {

        NSData *data = [sessionController readData:bytesAvailable];

        if (data) {

            _totalBytesRead = _totalBytesRead + bytesAvailable;

        }

    }

    [_receivedBytesCountLabel setText:[NSString stringWithFormat:@"Bytes Received from Session: %u", (unsigned int)_totalBytesRead]];

}

@end