//
//  CalculatorController.m
//  Bmi Calculator
//
//  Created by Jasarien on 11/06/2007.
//  Copyright 2007 Jasarien.Com All rights reserved.
//

#import "CalculatorController.h"
#import "AboutController.h"
#import "PreferenceController.h"

@implementation CalculatorController

+ (void)initialize
{
	//Create a dictionary
	NSMutableDictionary *defaultValues = [NSMutableDictionary dictionary];
	
	//Put the defaults in the dictionary
	[defaultValues setObject:[NSNumber numberWithInt:0]
					  forKey: JAMeasurementKey];
	
	//Register the dictionary of defaults
	[[NSUserDefaults standardUserDefaults]
			registerDefaults: defaultValues];
}

- (void)awakeFromNib
{
	[self checkMeasurement:nil];
}

- (IBAction)showAboutWindow:(id)sender
{
	[[AboutController sharedInstance] showPanel:sender];
}

- (IBAction)showPreferencePanel:(id)sender
{
	//is preferenceController nil?
	if (!preferenceController) {
		preferenceController = [[PreferenceController alloc] init];
	}
	
	[preferenceController showWindow:self];
	[preferenceController setMainController: self];
}

- (IBAction)checkMeasurement:(id)sender
{
	//Metric is state: 0
	//Imperial is state: 1
	
	NSUserDefaults *defaults;
	
	defaults = [NSUserDefaults standardUserDefaults];
	
	if ([defaults integerForKey:JAMeasurementKey] == 1)
	{
		//Set imperial
		[heightLabel setStringValue:@"Height (Feet)"];
		[weightLabel setStringValue:@"Weight (Stone)"];
		
		//convert any values in the fields to imperial
		[self convertTo:@"imperial"];
	} else {
		//Set metric
		[heightLabel setStringValue:@"Height (M)"];
		[weightLabel setStringValue:@"Weight (Kg)"];
		
		//convert any values in the fields to metric
		[self convertTo:@"metric"];
	}
}

- (void)convertTo:(NSString *)measurement
{
	if ([measurement isEqualToString:@"imperial"])
	{
		[heightField setFloatValue:([heightField floatValue] * 3.281)];
		[weightField setFloatValue:([weightField floatValue] * 0.1575)];
	} else if ([measurement isEqualToString:@"metric"])
	{
		[heightField setFloatValue:([heightField floatValue] * 0.3048)];
		//stone * 14 = pounds
		//pounds * 0.4536 = kilograms
		[weightField setFloatValue:(([weightField floatValue] * 14) * 0.4536)];
	}
}

- (IBAction)chooseCalcMethod:(id)sender
{
	//Metric is state: 0
	//Imperial is state: 1
	
	NSUserDefaults *defaults;
	
	defaults = [NSUserDefaults standardUserDefaults];
	
	if ([defaults integerForKey:JAMeasurementKey] == 1)
	{
		[self calculateImperialBmiFromWeight:[weightField floatValue] height:[heightField floatValue]];
	} else {
		[self calculateMetricBmiFromWeight:[weightField floatValue] height:[heightField floatValue]];
	}
}

- (void)calculateMetricBmiFromWeight:(float)kg height:(float)meters
{
	float bmi = kg / (meters * meters);
	
	[bmiField setFloatValue:bmi];
}

- (void)calculateImperialBmiFromWeight:(float)stone height:(float)feet
{
	//convert stone into pounds
	float pounds = stone * 14;
	//convert feet into inches
	float inches = feet * 12;
	
	float bmi = pounds / (inches * inches) * 703;
	
	[bmiField setFloatValue:bmi];
}

- (IBAction)clear:(id)sender
{
	[weightField setStringValue:@"0"];
	[heightField setStringValue:@"0"];
	[bmiField setStringValue:@"0"];
}

- (void)dealloc
{
	[preferenceController release];
	[super dealloc];
}

@end