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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#import "CalculatorViewController.h"
#import "CalculatedValues.h"
#import "CoreData.h"
#import "Equation.h"
#import "Expression.h"
#import "Literal.h"
@interface CalculatorViewController ()
- (void)updateEnabledViews;
- (void)updateButtonColor:(UIButton *)button;
@end
@implementation CalculatorViewController {
NSMutableArray *_locationStack;
NSMutableString *_currentNumber;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
self.title = @"Calculator";
CoreData *coreData = [[CoreData alloc] init];
[coreData verify];
}
return self;
}
- (void)viewDidLoad {
[super viewDidLoad];
_locationStack = [NSMutableArray array];
_currentNumber = [NSMutableString stringWithString:@""];
[self updateEnabledViews];
}
- (IBAction)enterDigit:(id)sender {
UIButton *button = (UIButton *)sender;
[_currentNumber appendString:button.titleLabel.text];
self.resultLabel.text = _currentNumber;
[self updateEnabledViews];
}
- (IBAction)finish:(id)sender {
if (![_locationStack count]) {
_currentNumber = [NSMutableString stringWithString:@""];
self.resultLabel.text = @"hello";
}
if (![_locationStack count]) {
_currentNumber = [NSMutableString stringWithString:@""];
} else if ([_currentNumber length]) {
Equation *last = [_locationStack lastObject];
[last addExpressionAsChild:[[Literal alloc] initWithDouble:
atof([_currentNumber cStringUsingEncoding:NSUTF8StringEncoding])]];
_currentNumber = [NSMutableString stringWithString:@""];
self.resultLabel.text = [NSString stringWithFormat:@"%@", last];
} else {
Equation *popped = [_locationStack lastObject];
[_locationStack removeLastObject];
[[CalculatedValues sharedInstance] addEquation:popped];
self.resultLabel.text =
[NSString stringWithFormat:@"%lf", [popped calculate]];
}
[self updateEnabledViews];
}
- (IBAction)operate:(id)sender {
Operation operation;
if ([_currentNumber length]) {
// finish the current number first automatically:
[self finish:nil];
}
if (sender == self.multiplyButton) {
operation = kMultiply;
} else if (sender == self.plusButton) {
operation = kAdd;
} else if (sender == self.divideButton) {
operation = kDivide;
} else if (sender == self.minusButton) {
operation = kSubtract;
} else {
// Shouldn't happen
operation = kAdd;
}
Equation *newEquation = [[Equation alloc] initWithOperation:operation];
if ([_locationStack count]) {
[[_locationStack lastObject] addExpressionAsChild:newEquation];
}
[_locationStack addObject:newEquation];
self.resultLabel.text = [NSString stringWithFormat:@"%@", _locationStack[0]];
[self updateEnabledViews];
}
#pragma mark - Private
- (void)updateEnabledViews {
self.finishButton.enabled = [_locationStack count] || [_currentNumber length];
[self updateButtonColor:self.finishButton];
self.zeroButton.enabled = self.finishButton.enabled;
[self updateButtonColor:self.zeroButton];
BOOL enableNonZeroDigits = ![_currentNumber isEqualToString:@"0"];
for (UIButton *digit in self.nonZeroDigitButtons) {
digit.enabled = enableNonZeroDigits;
[self updateButtonColor:digit];
}
}
- (void)updateButtonColor:(UIButton *)button {
button.backgroundColor = button.enabled ?
[UIColor whiteColor] : [UIColor grayColor];
}
@end
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