/*

 File: GPSDataSource.m

 Abstract: Table of geocache data to display on the map.

 Version: 1.0

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 */

#import "GPSDataSource.h"

static NSString *sSampleData[5][4] = {

{@"GCGFF3", @"Gorgeous Greenwich Park by Oompaloompas, Traditional Cache (1/1)", @"51.4722", @"0.0"},

{@"GCKGP3", @"My Deer by Andreka, Traditional Cache (2.5/1)", @"51.47567", @"0.00718"},

{@"GC11394", @"St. Alfeges, Traditional Cache (2/1.5)", @"51.48095", @"-0.01153"},

{@"GCPX37", @"Riverside - Old Royal Naval College by Master Mariner, Traditional Cache (2/1.5)", @"51.48368", @"-0.00753"},

{@"GC18FF", @"Prime Meridian Cache by Master Mariner, Traditional Cache (1/1.5)", @"51.47751", @"-0.00574"}

};

// Latitude and longitude for Greenwich, UK

static double homeLatitudeDegrees = 51.47647;

static double homeLongitudeDegrees = -0.00343;

@implementation GPSDataSource

- (NSString *)decimalDegreesToDMS:(double)decimalDegrees

                      positiveDir:(NSString *)plusDirection

                      negativeDir:(NSString *)minusDirection

{

    NSMutableString *formatString = nil;

    double absoluteDegrees = (decimalDegrees > 0 ? decimalDegrees : -decimalDegrees);

    BOOL isPlus = (decimalDegrees > 0);

    int degrees = floor(absoluteDegrees);

    double fraction = absoluteDegrees - degrees;

    double minutes = 60.0 * fraction;

    if (isPlus) {

        formatString = [NSMutableString stringWithString:plusDirection];

    } else {

        formatString = [NSMutableString stringWithString:minusDirection];

    }

    [formatString appendString:@" %d%C %3.3f"];

    return [NSString stringWithFormat:formatString, degrees, 0xb0, minutes];

}

- (NSString *)longitudeAsDMS:(double)inLongitude

{

    return [self decimalDegreesToDMS:inLongitude

                         positiveDir:@"W"

                         negativeDir:@"E"];

}

- (NSString *)latitudeAsDMS:(double)inLatitude

{

    return [self decimalDegreesToDMS:inLatitude

                         positiveDir:@"N"

                         negativeDir:@"S"];

}

- (double)distanceFromHomeForLatitude:(double)inLatitude longitude:(double)inLongitude

{

    // Convert everything to radians.

    double homeLat = homeLatitudeDegrees * pi/180.0;

    double homeLong = homeLongitudeDegrees * pi/180.0;

    double wptLat = inLatitude * pi/180.0;

    double wptLong = inLongitude * pi/180.0;

    // Crunch through our magic formula

    // (from <http://en.wikipedia.org/wiki/Great_circle_distance>)

    double innerValue = sin(homeLat) * sin(wptLat) + cos(homeLat) * cos(wptLat) * cos(wptLong - homeLong);

    double distance = 3953.254 * acos(innerValue);  

    return distance;

}

- (NSString *)bearingFromCenterForLatitude:(double)inLatitude longitude:(double)inLongitude

{

    // Convert everything to radians.

    double homeLat = homeLatitudeDegrees * pi/180.0;

    double homeLong = homeLongitudeDegrees * pi/180.0;

    double wptLat = inLatitude * pi/180.0;

    double wptLong = inLongitude * pi/180.0;

    double bearing = atan2(sin(wptLong - homeLong) * cos(wptLat),

                           cos(homeLat) * sin(wptLat) - sin(homeLat) * cos(wptLat) * cos(wptLong - homeLong));

    // Convert back to degrees.

    bearing = bearing * 180 / pi;

    NSString *returnValue = nil;

    if ((-22.5 <= bearing) && (bearing < 22.5)) {

        returnValue = @"N"; 

    } else if ((22.5 < bearing) && (bearing <= 67.5)) {

        returnValue = @"NE";            

    } else if ((67.50 < bearing) && (bearing <= 112.5)) {

        returnValue = @"E"; 

    } else if ((112.5 < bearing) && (bearing <= 157.5)) {

        returnValue = @"SE";    

    } else if ((157.5 < bearing) && (bearing <= 180)) {

        returnValue = @"S"; 

    } else if ((-180 < bearing) && (bearing <= -157.5)) {

        returnValue = @"S"; 

    } else if ((-157.5 < bearing) && (bearing <= -112.5)) {

        returnValue = @"SW";    

    } else if ((-112.5 < bearing) && (bearing <= -67.5)) {

        returnValue = @"W"; 

    } else if ((-67.5 < bearing) && (bearing <= -22.5)) {

        returnValue = @"NW";

    }

    return returnValue;

}

- (double)latitudeForRow:(int)inRow

{

    return [sSampleData[inRow][2] doubleValue];

}

- (double)longitudeForRow:(int)inRow;

{

    return [sSampleData[inRow][3] doubleValue];

}

- (int)numberOfRowsInTableView:(NSTableView *)tableView

{

    return 5;

}

- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(int)row;

{

    NSString *whichColumn = [tableColumn identifier];

    id returnValue = nil;

    if ([whichColumn isEqualToString:@"Identifier"]) {

        return sSampleData[row][0];

    } else if ([whichColumn isEqualToString:@"Description"]) {

        return sSampleData[row][1];

    } else if ([whichColumn isEqualToString:@"Direction"]) {

        double latitude = [sSampleData[row][2] doubleValue];

        double longitude = [sSampleData[row][3] doubleValue];

        returnValue = [self bearingFromCenterForLatitude:latitude longitude:longitude];

    } else if ([whichColumn isEqualToString:@"Distance"]) {

        double latitude = [sSampleData[row][2] doubleValue];

        double longitude = [sSampleData[row][3] doubleValue];

        double distance = [self distanceFromHomeForLatitude:latitude longitude:longitude];

        return [NSString stringWithFormat:@"%.2f mi", distance];

    } else if ([whichColumn isEqualToString:@"Latitude"]) {

        double latitude = [sSampleData[row][2] doubleValue];

        returnValue = [self latitudeAsDMS:latitude];

    } else if ([whichColumn isEqualToString:@"Longitude"]) {

        double longitude = [sSampleData[row][3] doubleValue];

        returnValue = [self longitudeAsDMS:longitude];

    }

    return returnValue;

}

@end