//
//  textConverter.m
//  Compass Screen
//
//  Created by Jeremy on 7/4/08.
//  Copyright 2008 Stone Software. All rights reserved.
//

#import "textConverter.h"
#import "Calculations.h"

@implementation textConverter


- (id)initWithString:(NSString*)str
{
	self = [super init];
	if (self != nil)
	{
		if (str != nil)
			[str retain];
		else
			str = [[NSString alloc] init];

		stringToParse = str;
	}

	return self;
}

- (id) init
{
	self = [super init];
	if (self != nil) {
		stringToParse = [self initWithString:nil];
	}
	return self;
}

- (void) dealloc
{
	if (stringToParse != nil)
		[stringToParse release];
	[super dealloc];	
}

// returns if conversion was successful.  passes back the degrees parsed from the val string.
- (BOOL) hourMinuteDecimalToDegrees:(double*) degrees
{
	double deg = 0;
	char temp[512];
	char tempX[512];
	char* ptr = temp;
	
	if (NO == [stringToParse getCString:temp maxLength:512 encoding:NSMacOSRomanStringEncoding])
	{
		return NO;
	}
	
	// move to the numbers
	while (!isdigit(ptr[0]))
	{
		ptr++;
	}
	
	// get the primary non-decimal portion.
	int x = 0;
	do
	{
		tempX[x] = ptr[0];
		ptr++;
		x++;
	} while (*ptr != kDividerCharacter && *ptr != 0);
	tempX[x] = 0;		// null terminate
	ptr++;		// now skip the delimiter.

	deg = atof(tempX);
	
	// combine deg with the float version of the remainder of the string.
	*degrees = deg + (atof(ptr) / 60);		// degree + decimal minute degrees / 60

	// convert deg to positive or negative depending on the string passed.
	if (NO == [Calculations directionIsPositiveDegree:stringToParse])
		*degrees *= -1;
	
	return YES;
}


- (BOOL) decimalFromString:(double*) val
{
	BOOL retVal = NO;
	char tempArray[512];
	char buffer[512];
	char prevChar = 0;
	int spaceCounter = -1;

	// cheat currently as I'm not cool enough to parse strings the obj-C way with NSScanner...  seems busted?  Probably jsut me.

	// verify that we can get a valid c string.
	if (NO == [stringToParse getCString:buffer maxLength:512 encoding:NSASCIIStringEncoding])
	{
		// Maybe later add a dialog or something here to explain to the user why it doesn't like the input.  For now ignore this.
		return retVal;
	}

	// remove all non-essential characters from the string, mushing things together.
	int len = 0;
	tempArray[0] = 0;	// start with a blank cstring.
	for(unsigned int x = 0; x < strlen(buffer); x++)
	{
		buffer[x] = toupper(buffer[x]);		// make sure it's uppercase.
		if (strchr(".-1234567890NESW ", buffer[x]) == nil)	// if we don't find this character in our list of "good" characters, convert it to a space.
		{
			buffer[x] = ' ';
		}

		if (strchr(".-1234567890NESW ", buffer[x]) != nil)	// if we find this character in our list of "good" characters, let it through.
		{
			if (buffer[x] == ' ' && prevChar == buffer[x])
				continue;	// skip multiple spaces in a row

			// after the initial NSEW, once we hit a digit, start counting the remaining spaces as dividers between segments.
			if (isdigit(buffer[x]))
				spaceCounter++;

			// if it's a space and we're counting spaces and we didn't just have a space.
			if (spaceCounter > -1 && buffer[x] == ' ' && prevChar != buffer[x])
				buffer[x] = kDividerCharacter;

			if (buffer[x] != ' ' || (buffer[x] == ' ' && spaceCounter > -1))
			{
				// append the string
				strncat(tempArray, &buffer[x], 1);
				prevChar = buffer[x];
				len++;
			}
		}
	}

	// ensure this str is null terminated.
	tempArray[len] = 0;
	if (strlen(tempArray))
	{
		if ([self isDegMin:tempArray])
		{
			double theVal;
			// parse the deg min sec format here
			
//			How do you convert to Degrees, from Degrees:Minutes:Seconds?
//				The latitude and longitude are input in degrees, so you might need to convert to degrees from 
//				degrees:minutes:seconds. There are 60 seconds in 1 minute and 60 minutes in 1 degree. So, for example:
//					
//					65:45:36 south latitude converts to
//					
//					-(65 degrees + (45 minutes * (1 degree/60 minutes)) + (36 seconds * (1 minute/60 seconds) * (1 degree/60 minutes))) = -65.76 degrees latitude					
			textConverter* converts = [[[textConverter alloc] initWithString:[NSString stringWithCString:tempArray encoding:NSMacOSRomanStringEncoding]] autorelease];
			if (YES == [converts hourMinuteDecimalToDegrees:&theVal])
				*val = theVal;
			else
				*val = 0.0;
		}
		// Assume decimal if its not [NESW] HH MM.MMM format for now.
		else //if ([self isDecimal:tempArray])
		{
			// parse the decimal format here.
			if (tempArray[0] == 'N' || tempArray[0] == 'E')			// north and east are positive.
			{
				int length = strlen(tempArray);
				memmove(&tempArray[0], &tempArray[1], strlen(&tempArray[1]));	// skip the 'N' or 'E'
				tempArray[length - 1] = 0;	// we are now 1 off since we skipped a char, so reduce our total length by one.
			}
			else if (tempArray[0] == 'S' || tempArray[0] == 'W')	// south and west are negative.
			{
				tempArray[0] = '-';
			}

			*val = atof(tempArray);
		}

		retVal = YES;
	}

	return retVal;
}


// 
- (BOOL) isDegMin:(char*)inStr
{
	BOOL retVal = NO;
	if (strstr(inStr, "N") || strstr(inStr, "E") || strstr(inStr, "S") || strstr(inStr, "W"))
	{
		retVal = YES;
	}
	// check to see if the stringToParse has degree minute seconds 

	return retVal;
}

- (BOOL) isDecimal:(char*)inStr
{
	BOOL retVal = YES;
	// check to see if this is a decimal string

	return retVal;
}

@end