//
//  MCDownloadReceipt.m
//  MCDownloadManager
//
//  Created by M.C on 17/4/6. (QQ:714080794 Gmail:chaoma0609@gmail.com)
//  Copyright © 2017年 qikeyun. All rights reserved.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

#import "MCDownloadReceipt.h"
#import <CommonCrypto/CommonDigest.h>

extern NSString * cacheFolder();

static unsigned long long fileSizeForPath(NSString *path) {
    
    signed long long fileSize = 0;
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:path]) {
        NSError *error = nil;
        NSDictionary *fileDict = [fileManager attributesOfItemAtPath:path error:&error];
        if (!error && fileDict) {
            fileSize = [fileDict fileSize];
        }
    }
    return fileSize;
}

static NSString * getMD5String(NSString *str) {
    
    if (str == nil) return nil;
    
    const char *cstring = str.UTF8String;
    unsigned char bytes[CC_MD5_DIGEST_LENGTH];
    CC_MD5(cstring, (CC_LONG)strlen(cstring), bytes);
    
    NSMutableString *md5String = [NSMutableString string];
    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
        [md5String appendFormat:@"%02x", bytes[i]];
    }
    return md5String;
}

@interface MCDownloadReceipt()

@property (nonatomic, assign) MCDownloadState state;

@property (nonatomic, copy) NSString *url;
@property (nonatomic, copy) NSString *filePath;
@property (nonatomic, copy) NSString *filename;
@property (nonatomic, copy) NSString *truename;
@property (nonatomic, strong) NSProgress *progress;

@property (assign, nonatomic) long long totalBytesWritten;

@end

@implementation MCDownloadReceipt

- (NSString *)filePath {
    
    NSString *path = [cacheFolder() stringByAppendingPathComponent:self.filename];
    if (![path isEqualToString:_filePath] ) {
        if (_filePath && ![[NSFileManager defaultManager] fileExistsAtPath:_filePath]) {
            NSString *dir = [_filePath stringByDeletingLastPathComponent];
            [[NSFileManager defaultManager] createDirectoryAtPath:dir withIntermediateDirectories:YES attributes:nil error:nil];
        }
        _filePath = path;
    }
    
    return _filePath;
}


- (NSString *)filename {
    if (_filename == nil) {
        NSString *pathExtension = self.url.pathExtension;
        if (pathExtension.length) {
            _filename = [NSString stringWithFormat:@"%@.%@", getMD5String(self.url), pathExtension];
        } else {
            _filename = getMD5String(self.url);
        }
    }
    return _filename;
}

- (NSString *)truename {
    if (_truename == nil) {
        _truename = self.url.lastPathComponent;
    }
    return _truename;
}

- (NSProgress *)progress {
    if (_progress == nil) {
        _progress = [[NSProgress alloc] initWithParent:nil userInfo:nil];
    }
    @try {
        _progress.totalUnitCount = self.totalBytesExpectedToWrite;
        _progress.completedUnitCount = self.totalBytesWritten;
    } @catch (NSException *exception) {
        
    }
    return _progress;
}

- (long long)totalBytesWritten {
    
    return fileSizeForPath(self.filePath);
}


- (instancetype)initWithURL:(NSString *)url {
    if (self = [self init]) {
        
        self.url = url;
    }
    return self;
}

#pragma mark - NSCoding
- (void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.url forKey:NSStringFromSelector(@selector(url))];
    [aCoder encodeObject:self.filePath forKey:NSStringFromSelector(@selector(filePath))];
    [aCoder encodeObject:@(self.state) forKey:NSStringFromSelector(@selector(state))];
    [aCoder encodeObject:self.filename forKey:NSStringFromSelector(@selector(filename))];
    [aCoder encodeObject:@(self.totalBytesWritten) forKey:NSStringFromSelector(@selector(totalBytesWritten))];
    [aCoder encodeObject:@(self.totalBytesExpectedToWrite) forKey:NSStringFromSelector(@selector(totalBytesExpectedToWrite))];
    
}

- (id)initWithCoder:(NSCoder *)aDecoder
{
    self = [super init];
    if (self) {
        self.url = [aDecoder decodeObjectForKey:NSStringFromSelector(@selector(url))];
        self.filePath = [aDecoder decodeObjectForKey:NSStringFromSelector(@selector(filePath))];
        self.state = [[aDecoder decodeObjectOfClass:[NSNumber class] forKey:NSStringFromSelector(@selector(state))] unsignedIntegerValue];
        self.filename = [aDecoder decodeObjectForKey:NSStringFromSelector(@selector(filename))];
        self.totalBytesWritten = [[aDecoder decodeObjectOfClass:[NSNumber class] forKey:NSStringFromSelector(@selector(totalBytesWritten))] unsignedIntegerValue];
        self.totalBytesExpectedToWrite = [[aDecoder decodeObjectOfClass:[NSNumber class] forKey:NSStringFromSelector(@selector(totalBytesExpectedToWrite))] unsignedIntegerValue];
        
    }
    return self;
}


- (instancetype)initWithURLString:(NSString *)URLString
     downloadOperationCancelToken:(id)downloadOperationCancelToken
          downloaderProgressBlock:(MCDownloaderProgressBlock)downloaderProgressBlock
         downloaderCompletedBlock:(MCDownloaderCompletedBlock)downloaderCompletedBlock {
    
    if (self = [self init]) {
        
        self.url = URLString;
        self.totalBytesExpectedToWrite = 0;
        self.downloadOperationCancelToken = downloadOperationCancelToken;
        self.downloaderProgressBlock = downloaderProgressBlock;
        self.downloaderCompletedBlock = downloaderCompletedBlock;
    }
    return self;
}

- (void)setTotalBytesExpectedToWrite:(long long)totalBytesExpectedToWrite {
    _totalBytesExpectedToWrite = totalBytesExpectedToWrite;
}

- (void)setState:(MCDownloadState)state {
    _state = state;
}

- (void)setDownloadOperationCancelToken:(id)downloadOperationCancelToken {
    _downloadOperationCancelToken = downloadOperationCancelToken;
}

- (void)setDownloaderProgressBlock:(MCDownloaderProgressBlock)downloaderProgressBlock {
    _downloaderProgressBlock = downloaderProgressBlock;
}

- (void)setDownloaderCompletedBlock:(MCDownloaderCompletedBlock)downloaderCompletedBlock {
    _downloaderCompletedBlock = downloaderCompletedBlock;
}

- (void)setSpeed:(NSString *)speed {
    _speed = speed;
}



@end