//
//  CalculateUtils.m
//  ChartView
//
//  Created by Simon Zhou on 14-6-20.
//  Copyright (c) 2014年 muchinfo. All rights reserved.
//

#import "ChartCalculateUtils.h"

@implementation ChartCalculateUtils

/**
 *	@brief	取得小数位数
 *
 *	@param 	number 	目标数据
 *
 *	@return	小数位数
 */
+ (NSInteger)getDecimalDigits:(NSDecimalNumber *)number
{
    NSInteger returnValue = 0;
    
    NSString *tempString = [number stringValue];
    NSRange range = [tempString rangeOfString:@"."];
    
    if (range.location != NSNotFound) {
        returnValue = tempString.length - range.location -1;
    }
    
    return returnValue;
}

/**
 *	@brief	截取指定小数位的值
 *
 *	@param 	price 	目标数据
 *	@param 	position 	有效小数位
 *
 *	@return	截取后数据
 */
+ (NSString *)notRounding:(NSDecimalNumber *)price afterPoint:(NSInteger)position
{
    NSDecimalNumberHandler *behavior = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundDown scale:0 raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:NO];
    
    //minUnit==0
    if (position == 0) {
        return [[price decimalNumberByRoundingAccordingToBehavior:behavior] description];
    }
    
    NSString *returnString = nil;
    NSDecimalNumberHandler* roundingBehavior = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain scale:position raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:NO];
    NSDecimalNumber *roundedOunces = [price decimalNumberByRoundingAccordingToBehavior:roundingBehavior];
    NSString *formatString = nil;
    switch (position) {
        case 1:
            formatString = @"%.1f";
            break;
        case 2:
            formatString = @"%.2f";
            break;
        case 3:
            formatString = @"%.3f";
            break;
        case 4:
            formatString = @"%.4f";
            break;
        case 5:
            formatString = @"%.5f";
            break;
        case 6:
            formatString = @"%.6f";
            break;
        case 7:
            formatString = @"%.7f";
            break;
        case 8:
            formatString = @"%.8f";
            break;
        default:
            formatString = @"%.2f";
            break;
    }
    returnString = [NSString stringWithFormat:formatString,[roundedOunces floatValue]];
    
    return returnString;
}

/**
 *	@brief	截取指定小数位的值
 *
 *	@param 	price 	目标数据
 *	@param 	position 	有效小数位
 *
 *	@return	截取后数据
 */
+ (nullable NSDecimalNumber *)notRoundingWithDecimalNumber:(nonnull NSDecimalNumber *)price afterPoint:(NSInteger)position
{
    NSDecimalNumberHandler* roundingBehavior = [NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundPlain scale:position raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:NO];
    NSDecimalNumber *roundedOunces;
    
    roundedOunces = [price decimalNumberByRoundingAccordingToBehavior:roundingBehavior];
    
    return roundedOunces;
}

/**
 *	@brief	取绝对值的方法
 *
 *	@param 	num 	目标数据
 *
 *	@return	绝对值
 */
+ (NSDecimalNumber *)abs:(NSDecimalNumber *)num
{
    if ([num compare:[NSDecimalNumber zero]] == NSOrderedAscending) {
        // Number is negative. Multiply by -1
        NSDecimalNumber * negativeOne = [NSDecimalNumber decimalNumberWithMantissa:1
                                                                          exponent:0
                                                                        isNegative:YES];
        return [num decimalNumberByMultiplyingBy:negativeOne];
    } else {
        return num;
    }
}

/**
 *	@brief	获取两个时间之间的分钟数
 *
 *	@param 	fromDate 	开始时间
 *	@param 	toDate 	结束时间
 *
 *	@return	分钟数
 */
+ (NSInteger)diffMinuteWithFromDate:(nonnull NSDate *)fromDate toDate:(nonnull NSDate *)toDate {
    if (!fromDate)
        return 0;
    
    NSCalendar* chineseClendar = [NSCalendar currentCalendar];
    NSInteger unitFlags = NSCalendarUnitMinute;
    
    NSDateComponents *cps = [chineseClendar components:unitFlags fromDate:fromDate toDate:toDate options:0];
    
    return [cps minute];
}

/**
 *	@brief	获取指定时间的当前分钟0秒时间
 *
 *	@param 	date 	目标时间对象
 *
 *	@return	当前分钟0秒时间
 */
+ (NSDate *)zeroSecondDateWithDate:(NSDate *)date
{
    NSCalendar* clendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSUInteger unitFlags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay | NSCalendarUnitHour | NSCalendarUnitMinute;
    NSDateComponents *components = [clendar components:unitFlags fromDate:date];
    
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateFormat = @"yyyy-MM-dd HH:mm:ss";
    
    NSDate *returnDate = [dateFormatter dateFromString:[NSString stringWithFormat:@"%d-%d-%d %d:%d:00",(int)[components year],(int)[components month],(int)[components day],(int)[components hour],(int)[components minute]]];
    
    return returnDate;
}

@end