//
//  CWFileStreamSeparation.h
//  uploadFileDemo
//
//  Created by hyjet on 2018/3/9.
//  Copyright © 2018年 uploadFileDemo. All rights reserved.
//

#import <Foundation/Foundation.h>

typedef enum : NSUInteger {
    CWUploadStatusWaiting = 0,//任务队列等待
    CWUploadStatusUpdownloading,//上传中
    CWUploadStatusPaused,//暂停
    CWUploadStatusFinished,//上传成功
    CWUploadStatusFailed //上传失败
} CWUploadStatus;//任务状态

#define CWStreamFragmentMaxSize         1024 * 1024 // 500KB


@class CWStreamFragment;

/**
 * 文件流操作类
 */
@interface CWFileStreamSeparation : NSObject<NSCoding>
@property (nonatomic, copy) NSString    *fileName;//包括文件后缀名的文件名
@property (nonatomic, strong)  NSData   *imageData; //文件预览图
@property (nonatomic, assign)  NSInteger timeStamp;    //时间戳
@property (nonatomic, assign) NSUInteger fileSize;//文件大小
@property (nonatomic, copy) NSString *filePath;;//文件所在的文件目录
@property (nonatomic, copy) NSString *uploadLocation;;//上传到服务器的文件目录
@property (nonatomic, assign)CWUploadStatus fileStatus;//文件状态
@property (nonatomic, copy)NSString *md5String;//文件md5编码名称
@property (nonatomic, strong) NSArray<CWStreamFragment*> *streamFragments;//文件分片数组
@property (nonatomic, copy) NSString *bizId;

@property (nonatomic,assign)double progressRate;//上传进度
@property (nonatomic,assign)NSInteger uploadDateSize;//已上传文件大小

@property (nonatomic,assign)NSInteger select;  // 是否被选中


/** description */
@property (readonly, copy) NSString *description;

//若为读取文件数据，打开一个已存在的文件。
//若为写入文件数据，如果文件不存在，会创建的新的空文件。（创建FileStreamer对象就可以直接使用fragments(分片数组)属性）
- (instancetype)initFileOperationAtPath:(NSString*)path forReadOperation:(BOOL)isReadOperation;

- (instancetype)initFileOperationAtPath:(NSString*)path forReadOperation:(BOOL)isReadOperation uploadLocation:(NSString *)uploadLocation imageData:(NSData *)imageData;

//获取当前偏移量
- (NSUInteger)offsetInFile;

//设置偏移量, 仅对读取设置
- (void)seekToFileOffset:(NSUInteger)offset;

//将偏移量定位到文件的末尾
- (NSUInteger)seekToEndOfFile;

//关闭文件
- (void)closeFile;

#pragma mark - 读操作
//通过分片信息读取对应的片数据
- (NSData*)readDateOfFragment:(CWStreamFragment*)fragment;

//从当前文件偏移量开始
- (NSData*)readDataOfLength:(NSUInteger)bytes;

//从当前文件偏移量开始
- (NSData*)readDataToEndOfFile;

#pragma mark - 写操作
//写入文件数据
- (void)writeData:(NSData *)data;

+(NSString*)fileKeyMD5WithPath:(NSString*)path;

@end

//上传文件片
@interface CWStreamFragment : NSObject<NSCoding>
@property (nonatomic,copy)NSString          *fragmentId;    //片的唯一标识
@property (nonatomic,assign)NSUInteger      fragmentSize;   //片的大小
@property (nonatomic,assign)NSUInteger      fragementOffset;//片的偏移量
@property (nonatomic,assign)BOOL            fragmentStatus; //上传状态 YES上传成功
@end