/*

 Copyright (c) 2013 RedBearLab

 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

 The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

*/

#import "BLE.h"
#import "BLEDefines.h"

@implementation BLE

@synthesize delegate;
@synthesize CM;
@synthesize peripherals;
@synthesize activePeripheral;

static bool isConnected = false;
static int rssi = 0;

// TODO should have a configurable list of services
CBUUID *redBearLabsServiceUUID;
CBUUID *adafruitServiceUUID;
CBUUID *lairdServiceUUID;
CBUUID *blueGigaServiceUUID;
CBUUID *hm10ServiceUUID;
CBUUID *serialServiceUUID;
CBUUID *readCharacteristicUUID;
CBUUID *writeCharacteristicUUID;

-(void) readRSSI
{
    [activePeripheral readRSSI];
}

-(BOOL) isConnected
{
    return isConnected;
}

-(void) read
{
//    CBUUID *uuid_service = [CBUUID UUIDWithString:@RBL_SERVICE_UUID];
//    CBUUID *uuid_char = [CBUUID UUIDWithString:@RBL_CHAR_TX_UUID];

//    [self readValue:uuid_service characteristicUUID:uuid_char p:activePeripheral];
     [self readValue:serialServiceUUID characteristicUUID:readCharacteristicUUID p:activePeripheral];

}

-(void) write:(NSData *)d
{
//    CBUUID *uuid_service = [CBUUID UUIDWithString:@RBL_SERVICE_UUID];
//    CBUUID *uuid_char = [CBUUID UUIDWithString:@RBL_CHAR_RX_UUID];
//
//    [self writeValue:uuid_service characteristicUUID:uuid_char p:activePeripheral data:d];
    [self writeValue:serialServiceUUID characteristicUUID:writeCharacteristicUUID p:activePeripheral data:d];
}

-(void) enableReadNotification:(CBPeripheral *)p
{
//    CBUUID *uuid_service = [CBUUID UUIDWithString:@RBL_SERVICE_UUID];
//    CBUUID *uuid_char = [CBUUID UUIDWithString:@RBL_CHAR_TX_UUID];
//
//    [self notification:uuid_service characteristicUUID:uuid_char p:p on:YES];
    [self notification:serialServiceUUID characteristicUUID:readCharacteristicUUID p:p on:YES];

}

-(void) notification:(CBUUID *)serviceUUID characteristicUUID:(CBUUID *)characteristicUUID p:(CBPeripheral *)p on:(BOOL)on
{
    CBService *service = [self findServiceFromUUID:serviceUUID p:p];

    if (!service)
    {
        NSLog(@"Could not find service with UUID %@ on peripheral with UUID %@",
               [self CBUUIDToString:serviceUUID],
               p.identifier.UUIDString);

        return;
    }

    CBCharacteristic *characteristic = [self findCharacteristicFromUUID:characteristicUUID service:service];

    if (!characteristic)
    {
        NSLog(@"Could not find characteristic with UUID %@ on service with UUID %@ on peripheral with UUID %@",
              [self CBUUIDToString:characteristicUUID],
              [self CBUUIDToString:serviceUUID],
              p.identifier.UUIDString);

        return;
    }

    [p setNotifyValue:on forCharacteristic:characteristic];
}

-(UInt16) frameworkVersion
{
    return RBL_BLE_FRAMEWORK_VER;
}

-(NSString *) CBUUIDToString:(CBUUID *) cbuuid;
{
    NSData *data = cbuuid.data;

    if ([data length] == 2)
    {
        const unsigned char *tokenBytes = [data bytes];
        return [NSString stringWithFormat:@"%02x%02x", tokenBytes[0], tokenBytes[1]];
    }
    else if ([data length] == 16)
    {
        NSUUID* nsuuid = [[NSUUID alloc] initWithUUIDBytes:[data bytes]];
        return [nsuuid UUIDString];
    }

    return [cbuuid description];
}

-(void) readValue: (CBUUID *)serviceUUID characteristicUUID:(CBUUID *)characteristicUUID p:(CBPeripheral *)p
{
    CBService *service = [self findServiceFromUUID:serviceUUID p:p];

    if (!service)
    {
        NSLog(@"Could not find service with UUID %@ on peripheral with UUID %@",
              [self CBUUIDToString:serviceUUID],
              p.identifier.UUIDString);

        return;
    }

    CBCharacteristic *characteristic = [self findCharacteristicFromUUID:characteristicUUID service:service];

    if (!characteristic)
    {
        NSLog(@"Could not find characteristic with UUID %@ on service with UUID %@ on peripheral with UUID %@",
              [self CBUUIDToString:characteristicUUID],
              [self CBUUIDToString:serviceUUID],
              p.identifier.UUIDString);

        return;
    }

    [p readValueForCharacteristic:characteristic];
}

-(void) writeValue:(CBUUID *)serviceUUID characteristicUUID:(CBUUID *)characteristicUUID p:(CBPeripheral *)p data:(NSData *)data
{
    CBService *service = [self findServiceFromUUID:serviceUUID p:p];

    if (!service)
    {
        NSLog(@"Could not find service with UUID %@ on peripheral with UUID %@",
              [self CBUUIDToString:serviceUUID],
              p.identifier.UUIDString);

        return;
    }

    CBCharacteristic *characteristic = [self findCharacteristicFromUUID:characteristicUUID service:service];

    if (!characteristic)
    {
        NSLog(@"Could not find characteristic with UUID %@ on service with UUID %@ on peripheral with UUID %@",
              [self CBUUIDToString:characteristicUUID],
              [self CBUUIDToString:serviceUUID],
              p.identifier.UUIDString);

        return;
    }

    if ((characteristic.properties & CBCharacteristicPropertyWrite) == CBCharacteristicPropertyWrite) {
        [p writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithResponse];
    }
    else if ((characteristic.properties & CBCharacteristicPropertyWriteWithoutResponse) == CBCharacteristicPropertyWriteWithoutResponse) {
        [p writeValue:data forCharacteristic:characteristic type:CBCharacteristicWriteWithoutResponse];
    }
}

-(UInt16) swap:(UInt16)s
{
    UInt16 temp = s << 8;
    temp |= (s >> 8);
    return temp;
}

- (void) controlSetup
{
    self.CM = [[CBCentralManager alloc] initWithDelegate:self queue:nil];
}

- (int) findBLEPeripherals:(int) timeout
{
    if (self.CM.state != CBCentralManagerStatePoweredOn)
    {
        NSLog(@"CoreBluetooth not correctly initialized !");
        NSLog(@"State = %ld (%s)\r\n", (long)self.CM.state, [self centralManagerStateToString:self.CM.state]);
        return -1;
    }

    [NSTimer scheduledTimerWithTimeInterval:(float)timeout target:self selector:@selector(scanTimer:) userInfo:nil repeats:NO];

#if TARGET_OS_IPHONE
    redBearLabsServiceUUID = [CBUUID UUIDWithString:@RBL_SERVICE_UUID];
    adafruitServiceUUID = [CBUUID UUIDWithString:@ADAFRUIT_SERVICE_UUID];
    lairdServiceUUID = [CBUUID UUIDWithString:@LAIRD_SERVICE_UUID];
    blueGigaServiceUUID = [CBUUID UUIDWithString:@BLUEGIGA_SERVICE_UUID];
    hm10ServiceUUID = [CBUUID UUIDWithString:@HM10_SERVICE_UUID];
    NSArray *services = @[redBearLabsServiceUUID, adafruitServiceUUID, lairdServiceUUID, blueGigaServiceUUID, hm10ServiceUUID];
    [self.CM scanForPeripheralsWithServices:services options: nil];
#else
    [self.CM scanForPeripheralsWithServices:nil options:nil]; // Start scanning
#endif

    NSLog(@"scanForPeripheralsWithServices");

    return 0; // Started scanning OK !
}

- (void)centralManager:(CBCentralManager *)central didDisconnectPeripheral:(CBPeripheral *)peripheral error:(NSError *)error;
{
    done = false;

    [[self delegate] bleDidDisconnect];

    isConnected = false;
}

- (void) connectPeripheral:(CBPeripheral *)peripheral
{
    NSLog(@"Connecting to peripheral with UUID : %@", peripheral.identifier.UUIDString);

    self.activePeripheral = peripheral;
    self.activePeripheral.delegate = self;
    [self.CM connectPeripheral:self.activePeripheral
                       options:[NSDictionary dictionaryWithObject:[NSNumber numberWithBool:YES] forKey:CBConnectPeripheralOptionNotifyOnDisconnectionKey]];
}

- (const char *) centralManagerStateToString: (int)state
{
    switch(state)
    {
        case CBCentralManagerStateUnknown:
            return "State unknown (CBCentralManagerStateUnknown)";
        case CBCentralManagerStateResetting:
            return "State resetting (CBCentralManagerStateUnknown)";
        case CBCentralManagerStateUnsupported:
            return "State BLE unsupported (CBCentralManagerStateResetting)";
        case CBCentralManagerStateUnauthorized:
            return "State unauthorized (CBCentralManagerStateUnauthorized)";
        case CBCentralManagerStatePoweredOff:
            return "State BLE powered off (CBCentralManagerStatePoweredOff)";
        case CBCentralManagerStatePoweredOn:
            return "State powered up and ready (CBCentralManagerStatePoweredOn)";
        default:
            return "State unknown";
    }

    return "Unknown state";
}

- (void) scanTimer:(NSTimer *)timer
{
    [self.CM stopScan];
    NSLog(@"Stopped Scanning");
    NSLog(@"Known peripherals : %lu", (unsigned long)[self.peripherals count]);
    [self printKnownPeripherals];
}

- (void) printKnownPeripherals
{
    NSLog(@"List of currently known peripherals :");

    for (int i = 0; i < self.peripherals.count; i++)
    {
        CBPeripheral *p = [self.peripherals objectAtIndex:i];

        if (p.identifier != NULL)
            NSLog(@"%d  |  %@", i, p.identifier.UUIDString);
        else
            NSLog(@"%d  |  NULL", i);

        [self printPeripheralInfo:p];
    }
}

- (void) printPeripheralInfo:(CBPeripheral*)peripheral
{
    NSLog(@"------------------------------------");
    NSLog(@"Peripheral Info :");

    if (peripheral.identifier != NULL)
        NSLog(@"UUID : %@", peripheral.identifier.UUIDString);
    else
        NSLog(@"UUID : NULL");

    NSLog(@"Name : %@", peripheral.name);
    NSLog(@"-------------------------------------");
}

- (BOOL) UUIDSAreEqual:(NSUUID *)UUID1 UUID2:(NSUUID *)UUID2
{
    if ([UUID1.UUIDString isEqualToString:UUID2.UUIDString])
        return TRUE;
    else
        return FALSE;
}

-(void) getAllServicesFromPeripheral:(CBPeripheral *)p
{
    [p discoverServices:nil]; // Discover all services without filter
}

-(void) getAllCharacteristicsFromPeripheral:(CBPeripheral *)p
{
    for (int i=0; i < p.services.count; i++)
    {
        CBService *s = [p.services objectAtIndex:i];
        //        printf("Fetching characteristics for service with UUID : %s\r\n",[self CBUUIDToString:s.UUID]);
        [p discoverCharacteristics:nil forService:s];
    }
}

-(int) compareCBUUID:(CBUUID *) UUID1 UUID2:(CBUUID *)UUID2
{
    char b1[16];
    char b2[16];
    [UUID1.data getBytes:b1];
    [UUID2.data getBytes:b2];

    if (memcmp(b1, b2, UUID1.data.length) == 0)
        return 1;
    else
        return 0;
}

-(int) compareCBUUIDToInt:(CBUUID *)UUID1 UUID2:(UInt16)UUID2
{
    char b1[16];

    [UUID1.data getBytes:b1];
    UInt16 b2 = [self swap:UUID2];

    if (memcmp(b1, (char *)&b2, 2) == 0)
        return 1;
    else
        return 0;
}

-(UInt16) CBUUIDToInt:(CBUUID *) UUID
{
    char b1[16];
    [UUID.data getBytes:b1];
    return ((b1[0] << 8) | b1[1]);
}

-(CBUUID *) IntToCBUUID:(UInt16)UUID
{
    char t[16];
    t[0] = ((UUID >> 8) & 0xff); t[1] = (UUID & 0xff);
    NSData *data = [[NSData alloc] initWithBytes:t length:16];
    return [CBUUID UUIDWithData:data];
}

-(CBService *) findServiceFromUUID:(CBUUID *)UUID p:(CBPeripheral *)p
{
    for(int i = 0; i < p.services.count; i++)
    {
        CBService *s = [p.services objectAtIndex:i];
        if ([self compareCBUUID:s.UUID UUID2:UUID])
            return s;
    }

    return nil; //Service not found on this peripheral
}

-(CBCharacteristic *) findCharacteristicFromUUID:(CBUUID *)UUID service:(CBService*)service
{
    for(int i=0; i < service.characteristics.count; i++)
    {
        CBCharacteristic *c = [service.characteristics objectAtIndex:i];
        if ([self compareCBUUID:c.UUID UUID2:UUID]) return c;
    }

    return nil; //Characteristic not found on this service
}

#if TARGET_OS_IPHONE
    //-- no need for iOS
#else
- (BOOL) isLECapableHardware
{
    NSString * state = nil;

    switch ([CM state])
    {
        case CBCentralManagerStateUnsupported:
            state = @"The platform/hardware doesn't support Bluetooth Low Energy.";
            break;

        case CBCentralManagerStateUnauthorized:
            state = @"The app is not authorized to use Bluetooth Low Energy.";
            break;

        case CBCentralManagerStatePoweredOff:
            state = @"Bluetooth is currently powered off.";
            break;

        case CBCentralManagerStatePoweredOn:
            return TRUE;

        case CBCentralManagerStateUnknown:
        default:
            return FALSE;

    }

    NSLog(@"Central manager state: %@", state);

    NSAlert *alert = [[NSAlert alloc] init];
    [alert setMessageText:state];
    [alert addButtonWithTitle:@"OK"];
    [alert setIcon:[[NSImage alloc] initWithContentsOfFile:@"AppIcon"]];
    [alert beginSheetModalForWindow:nil modalDelegate:self didEndSelector:nil contextInfo:nil];

    return FALSE;
}
#endif

- (void)centralManagerDidUpdateState:(CBCentralManager *)central
{
#if TARGET_OS_IPHONE
    NSLog(@"Status of CoreBluetooth central manager changed %ld (%s)", (long)central.state, [self centralManagerStateToString:central.state]);
#else
    [self isLECapableHardware];
#endif
}

- (void)centralManager:(CBCentralManager *)central didDiscoverPeripheral:(CBPeripheral *)peripheral advertisementData:(NSDictionary *)advertisementData RSSI:(NSNumber *)RSSI
{
    if (!self.peripherals)
        self.peripherals = [[NSMutableArray alloc] initWithObjects:peripheral,nil];
    else
    {
        for(int i = 0; i < self.peripherals.count; i++)
        {
            CBPeripheral *p = [self.peripherals objectAtIndex:i];
            [p bts_setAdvertisementData:advertisementData RSSI:RSSI];

            if ((p.identifier == NULL) || (peripheral.identifier == NULL))
                continue;

            if ([self UUIDSAreEqual:p.identifier UUID2:peripheral.identifier])
            {
                [self.peripherals replaceObjectAtIndex:i withObject:peripheral];
                NSLog(@"Duplicate UUID found updating...");
                return;
            }
        }

        [self.peripherals addObject:peripheral];

        NSLog(@"New UUID, adding");
    }

    NSLog(@"didDiscoverPeripheral");
}

- (void)centralManager:(CBCentralManager *)central didConnectPeripheral:(CBPeripheral *)peripheral
{
    if (peripheral.identifier != NULL)
        NSLog(@"Connected to %@ successful", peripheral.identifier.UUIDString);
    else
        NSLog(@"Connected to NULL successful");

    self.activePeripheral = peripheral;
    [self.activePeripheral discoverServices:nil];
    [self getAllServicesFromPeripheral:peripheral];
}

static bool done = false;

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverCharacteristicsForService:(CBService *)service error:(NSError *)error
{
    if (!error)
    {
        //        printf("Characteristics of service with UUID : %s found\n",[self CBUUIDToString:service.UUID]);

        for (int i=0; i < service.characteristics.count; i++)
        {
            //            CBCharacteristic *c = [service.characteristics objectAtIndex:i];
            //            printf("Found characteristic %s\n",[ self CBUUIDToString:c.UUID]);
            CBService *s = [peripheral.services objectAtIndex:(peripheral.services.count - 1)];

            if ([service.UUID isEqual:s.UUID])
            {
                if (!done)
                {
                    [self enableReadNotification:activePeripheral];
                    [[self delegate] bleDidConnect];
                    isConnected = true;
                    done = true;
                }

                break;
            }
        }
    }
    else
    {
        NSLog(@"Characteristic discorvery unsuccessful!");
    }
}

- (void)peripheral:(CBPeripheral *)peripheral didDiscoverServices:(NSError *)error
{
    if (!error)
    {
        // Determine if we're connected to Red Bear Labs, Adafruit or Laird hardware
        for (CBService *service in peripheral.services) {

            if ([service.UUID isEqual:redBearLabsServiceUUID]) {
                NSLog(@"RedBearLabs Bluetooth");
                serialServiceUUID = redBearLabsServiceUUID;
                readCharacteristicUUID = [CBUUID UUIDWithString:@RBL_CHAR_TX_UUID];
                writeCharacteristicUUID = [CBUUID UUIDWithString:@RBL_CHAR_RX_UUID];
                break;
            } else if ([service.UUID isEqual:adafruitServiceUUID]) {
                NSLog(@"Adafruit Bluefruit LE");
                serialServiceUUID = adafruitServiceUUID;
                readCharacteristicUUID = [CBUUID UUIDWithString:@ADAFRUIT_CHAR_TX_UUID];
                writeCharacteristicUUID = [CBUUID UUIDWithString:@ADAFRUIT_CHAR_RX_UUID];
                break;
            } else if ([service.UUID isEqual:lairdServiceUUID]) {
                NSLog(@"Laird BL600");
                serialServiceUUID = lairdServiceUUID;
                readCharacteristicUUID = [CBUUID UUIDWithString:@LAIRD_CHAR_TX_UUID];
                writeCharacteristicUUID = [CBUUID UUIDWithString:@LAIRD_CHAR_RX_UUID];
                break;
            } else if ([service.UUID isEqual:blueGigaServiceUUID]) {
                NSLog(@"BlueGiga Bluetooth");
                serialServiceUUID = blueGigaServiceUUID;
                readCharacteristicUUID = [CBUUID UUIDWithString:@BLUEGIGA_CHAR_TX_UUID];
                writeCharacteristicUUID = [CBUUID UUIDWithString:@BLUEGIGA_CHAR_RX_UUID];
                break;
            } else if ([service.UUID isEqual:hm10ServiceUUID]) {
                NSLog(@"HM-10 Bluetooth");
                serialServiceUUID = hm10ServiceUUID;
                readCharacteristicUUID = [CBUUID UUIDWithString:@HM10_CHAR_TX_UUID];
                writeCharacteristicUUID = [CBUUID UUIDWithString:@HM10_CHAR_RX_UUID];
                break;
            } else {
                // ignore unknown services
            }
        }

        // TODO - future versions should just get characteristics we care about
        // [peripheral discoverCharacteristics:characteristics forService:service];
        [self getAllCharacteristicsFromPeripheral:peripheral];
    }
    else
    {
        NSLog(@"Service discovery was unsuccessful!");
    }
}

- (void)peripheral:(CBPeripheral *)peripheral didUpdateNotificationStateForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
{
    if (!error)
    {
        //        printf("Updated notification state for characteristic with UUID %s on service with  UUID %s on peripheral with UUID %s\r\n",[self CBUUIDToString:characteristic.UUID],[self CBUUIDToString:characteristic.service.UUID],[self UUIDToString:peripheral.UUID]);
    }
    else
    {
        NSLog(@"Error in setting notification state for characteristic with UUID %@ on service with UUID %@ on peripheral with UUID %@",
               [self CBUUIDToString:characteristic.UUID],
               [self CBUUIDToString:characteristic.service.UUID],
               peripheral.identifier.UUIDString);

        NSLog(@"Error code was %s", [[error description] cStringUsingEncoding:NSStringEncodingConversionAllowLossy]);
    }
}

- (void)peripheral:(CBPeripheral *)peripheral didUpdateValueForCharacteristic:(CBCharacteristic *)characteristic error:(NSError *)error
{
    unsigned char data[20];

    static unsigned char buf[512];
    static int len = 0;
    NSInteger data_len;

    if (!error)
    {
        if ([characteristic.UUID isEqual:readCharacteristicUUID])
        {
            data_len = characteristic.value.length;
            [characteristic.value getBytes:data length:data_len];

            if (data_len == 20)
            {
                memcpy(&buf[len], data, 20);
                len += data_len;

                if (len >= 64)
                {
                    [[self delegate] bleDidReceiveData:buf length:len];
                    len = 0;
                }
            }
            else if (data_len < 20)
            {
                memcpy(&buf[len], data, data_len);
                len += data_len;

                [[self delegate] bleDidReceiveData:buf length:len];
                len = 0;
            }
        }
    }
    else
    {
        NSLog(@"updateValueForCharacteristic failed!");
    }
}

- (void)peripheralDidUpdateRSSI:(CBPeripheral *)peripheral error:(NSError *)error
{
    if (!isConnected)
        return;

    if (rssi != peripheral.RSSI.intValue)
    {
        rssi = peripheral.RSSI.intValue;
        [[self delegate] bleDidUpdateRSSI:activePeripheral.RSSI];
    }
}

@end