//
//  NSURL+ImageSize.m
//  MEISHI
//
//  Created by CY on 2021/2/26.
//  Copyright © 2021 leo. All rights reserved.
//

#import "NSURL+ImageSize.h"

static NSString *const XOSSPROCESS = @"x-oss-process";

@implementation NSURL (ImageSize)

- (NSURL *)urlWithImageScale:(NSInteger)scale{
    NSDictionary *params = [self getParamsWithUrlString:self.absoluteString];
    if (params == nil) {
        NSString *appendStr = [NSString stringWithFormat:@"?%@=image/quality,q_%ld",XOSSPROCESS,scale];
        NSString *str = [NSString stringWithFormat:@"%@%@",self.absoluteString,appendStr];
        return [NSURL URLWithString:str];
    }else{
        if ([params.allKeys containsObject:XOSSPROCESS]) {
            return self;
        }else{
            NSString *appendStr = [NSString stringWithFormat:@"&%@=image/quality,q_%ld",XOSSPROCESS,scale];
            NSString *str = [NSString stringWithFormat:@"%@%@",self.absoluteString,appendStr];
            return [NSURL URLWithString:str];
        }
    }
}
- (NSURL *)urlWithImageResize:(NSInteger)scale{
//	?x-oss-process=image/crop,x_100,y_50
	NSString *const process= @"x-oss-process";
	NSDictionary *params = [self getParamsWithUrlString:self.absoluteString];
	if (params == nil) {
		NSString *appendStr = [NSString stringWithFormat:@"?%@=image/resize,w_%zd",process,scale];
		NSString *str = [NSString stringWithFormat:@"%@%@",self.absoluteString,appendStr];
		return [NSURL URLWithString:str];
	}else{
		if ([params.allKeys containsObject:process]) {
			return self;
		}else{
			NSString *appendStr = [NSString stringWithFormat:@"?%@=image/resize,w_%zd",process,scale];
			NSString *str = [NSString stringWithFormat:@"%@%@",self.absoluteString,appendStr];
			return [NSURL URLWithString:str];
		}
	}
}

- (NSDictionary *)getParamsWithUrlString:(NSString*)urlString {
    if(urlString.length==0) {
        return nil;
    }
    //先截取问号
    NSArray* allElements = [urlString componentsSeparatedByString:@"?"];
    NSMutableDictionary* params = [NSMutableDictionary dictionary];//待set的参数字典
    
    if(allElements.count == 2) {
        //有参数或者?后面为空
        NSString* paramsString = allElements[1];
        //获取参数对
        NSArray*paramsArray = [paramsString componentsSeparatedByString:@"&"];
        if(paramsArray.count>=2) {
            for(NSInteger i =0; i < paramsArray.count; i++) {
                NSString* singleParamString = paramsArray[i];
                NSArray* singleParamSet = [singleParamString componentsSeparatedByString:@"="];
                if(singleParamSet.count==2) {
                    NSString* key = singleParamSet[0];
                    NSString* value = singleParamSet[1];
                    if(key.length>0|| value.length>0) {
                        [params setObject: value.length>0? value:@"" forKey:key.length>0?key:@""];
                    }
                }
            }
        }else if(paramsArray.count == 1) {//无 &。url只有?后一个参数
            NSString* singleParamString = paramsArray[0];
            
            NSArray* singleParamSet = [singleParamString componentsSeparatedByString:@"="];
            if(singleParamSet.count==2) {
                NSString* key = singleParamSet[0];
                NSString* value = singleParamSet[1];
                if(key.length>0 || value.length>0) {
                    [params setObject:value.length>0?value:@""forKey:key.length>0?key:@""];
                }
            }else{
                //问号后面啥也没有 xxxx?  无需处理
            }
        }
        //整合url及参数
        return params;
    }else if(allElements.count>2) {
        return nil;
    }else{
        return nil;
    }
}


@end