//
//  QNResumeUpload.m
//  QiniuSDK
//
//  Created by bailong on 14/10/1.
//  Copyright (c) 2014年 Qiniu. All rights reserved.
//

#import "QNResumeUpload.h"
#import "QNConfiguration.h"
#import "QNCrc32.h"
#import "QNRecorderDelegate.h"
#import "QNResponseInfo.h"
#import "QNUploadManager.h"
#import "QNUploadOption+Private.h"
#import "QNUrlSafeBase64.h"

typedef void (^task)(void);

@interface QNResumeUpload ()

@property (nonatomic, strong) id<QNHttpDelegate> httpManager;
@property UInt32 size;
@property (nonatomic) int retryTimes;
@property (nonatomic, strong) NSString *key;
@property (nonatomic, strong) NSString *recorderKey;
@property (nonatomic) NSDictionary *headers;
@property (nonatomic, strong) QNUploadOption *option;
@property (nonatomic, strong) QNUpToken *token;
@property (nonatomic, strong) QNUpCompletionHandler complete;
@property (nonatomic, strong) NSMutableArray *contexts;

@property int64_t modifyTime;
@property (nonatomic, strong) id<QNRecorderDelegate> recorder;

@property (nonatomic, strong) QNConfiguration *config;

@property UInt32 chunkCrc;

@property (nonatomic, strong) id<QNFileDelegate> file;

//@property (nonatomic, strong) NSArray *fileAry;

@property (nonatomic) float previousPercent;

@property (nonatomic, strong) NSString *access; //AK

- (void)makeBlock:(NSString *)uphost
           offset:(UInt32)offset
        blockSize:(UInt32)blockSize
        chunkSize:(UInt32)chunkSize
         progress:(QNInternalProgressBlock)progressBlock
         complete:(QNCompleteBlock)complete;

- (void)putChunk:(NSString *)uphost
          offset:(UInt32)offset
            size:(UInt32)size
         context:(NSString *)context
        progress:(QNInternalProgressBlock)progressBlock
        complete:(QNCompleteBlock)complete;

- (void)makeFile:(NSString *)uphost
        complete:(QNCompleteBlock)complete;

@end

@implementation QNResumeUpload

- (instancetype)initWithFile:(id<QNFileDelegate>)file
                     withKey:(NSString *)key
                   withToken:(QNUpToken *)token
       withCompletionHandler:(QNUpCompletionHandler)block
                  withOption:(QNUploadOption *)option
                withRecorder:(id<QNRecorderDelegate>)recorder
             withRecorderKey:(NSString *)recorderKey
             withHttpManager:(id<QNHttpDelegate>)http
           withConfiguration:(QNConfiguration *)config;
{
    if (self = [super init]) {
        _file = file;
        _size = (UInt32)[file size];
        _key = key;
        NSString *tokenUp = [NSString stringWithFormat:@"UpToken %@", token.token];
        _option = option != nil ? option : [QNUploadOption defaultOptions];
        _complete = block;
        _headers = @{@"Authorization" : tokenUp, @"Content-Type" : @"application/octet-stream"};
        _recorder = recorder;
        _httpManager = http;
        _modifyTime = [file modifyTime];
        _recorderKey = recorderKey;
        _contexts = [[NSMutableArray alloc] initWithCapacity:(_size + kQNBlockSize - 1) / kQNBlockSize];
        _config = config;

        _token = token;
        _previousPercent = 0;

        _access = token.access;
    }
    return self;
}

// save json value
//{
//    "size":filesize,
//    "offset":lastSuccessOffset,
//    "modify_time": lastFileModifyTime,
//    "contexts": contexts
//}

- (void)record:(UInt32)offset {
    NSString *key = self.recorderKey;
    if (offset == 0 || _recorder == nil || key == nil || [key isEqualToString:@""]) {
        return;
    }
    NSNumber *n_size = @(self.size);
    NSNumber *n_offset = @(offset);
    NSNumber *n_time = [NSNumber numberWithLongLong:_modifyTime];
    NSMutableDictionary *rec = [NSMutableDictionary dictionaryWithObjectsAndKeys:n_size, @"size", n_offset, @"offset", n_time, @"modify_time", _contexts, @"contexts", nil];

    NSError *error;
    NSData *data = [NSJSONSerialization dataWithJSONObject:rec options:NSJSONWritingPrettyPrinted error:&error];
    if (error != nil) {
        NSLog(@"up record json error %@ %@", key, error);
        return;
    }
    error = [_recorder set:key data:data];
    if (error != nil) {
        NSLog(@"up record set error %@ %@", key, error);
    }
}

- (void)removeRecord {
    if (_recorder == nil) {
        return;
    }
    [_recorder del:self.recorderKey];
}

- (UInt32)recoveryFromRecord {
    NSString *key = self.recorderKey;
    if (_recorder == nil || key == nil || [key isEqualToString:@""]) {
        return 0;
    }

    NSData *data = [_recorder get:key];
    if (data == nil) {
        return 0;
    }

    NSError *error;
    NSDictionary *info = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];
    if (error != nil) {
        NSLog(@"recovery error %@ %@", key, error);
        [_recorder del:self.key];
        return 0;
    }
    NSNumber *n_offset = info[@"offset"];
    NSNumber *n_size = info[@"size"];
    NSNumber *time = info[@"modify_time"];
    NSArray *contexts = info[@"contexts"];
    if (n_offset == nil || n_size == nil || time == nil || contexts == nil) {
        return 0;
    }

    UInt32 offset = [n_offset unsignedIntValue];
    UInt32 size = [n_size unsignedIntValue];
    if (offset > size || size != self.size) {
        return 0;
    }
    UInt64 t = [time unsignedLongLongValue];
    if (t != _modifyTime) {
        NSLog(@"modify time changed %llu, %llu", t, _modifyTime);
        return 0;
    }
    _contexts = [[NSMutableArray alloc] initWithArray:contexts copyItems:true];
    return offset;
}

- (void)nextTask:(UInt32)offset retriedTimes:(int)retried host:(NSString *)host {
    if (self.option.cancellationSignal()) {
        self.complete([QNResponseInfo cancel], self.key, nil);
        return;
    }

    if (offset == self.size) {
        QNCompleteBlock completionHandler = ^(QNResponseInfo *info, NSDictionary *resp) {
            if (info.isOK) {
                [self removeRecord];
                self.option.progressHandler(self.key, 1.0);
            } else if (info.couldRetry && retried < _config.retryMax) {
                [self nextTask:offset retriedTimes:retried + 1 host:host];
                return;
            }
            self.complete(info, self.key, resp);
        };
        [self makeFile:host complete:completionHandler];
        return;
    }

    UInt32 chunkSize = [self calcPutSize:offset];
    QNInternalProgressBlock progressBlock = ^(long long totalBytesWritten, long long totalBytesExpectedToWrite) {
        float percent = (float)(offset + totalBytesWritten) / (float)self.size;
        if (percent > 0.95) {
            percent = 0.95;
        }
        if (percent > _previousPercent) {
            _previousPercent = percent;
        } else {
            percent = _previousPercent;
        }
        self.option.progressHandler(self.key, percent);
    };

    QNCompleteBlock completionHandler = ^(QNResponseInfo *info, NSDictionary *resp) {
        if (info.error != nil) {
            if (info.statusCode == 701) {
                [self nextTask:(offset / kQNBlockSize) * kQNBlockSize retriedTimes:0 host:host];
                return;
            }
            if (retried >= _config.retryMax || !info.couldRetry) {
                self.complete(info, self.key, resp);
                return;
            }

            NSString *nextHost = host;
            if (info.isConnectionBroken || info.needSwitchServer) {
                nextHost = [_config.zone up:_token isHttps:_config.useHttps frozenDomain:nextHost];
            }

            [self nextTask:offset retriedTimes:retried + 1 host:nextHost];
            return;
        }

        if (resp == nil) {
            [self nextTask:offset retriedTimes:retried host:host];
            return;
        }

        NSString *ctx = resp[@"ctx"];
        NSNumber *crc = resp[@"crc32"];
        if (ctx == nil || crc == nil || [crc unsignedLongValue] != _chunkCrc) {
            [self nextTask:offset retriedTimes:retried host:host];
            return;
        }
        _contexts[offset / kQNBlockSize] = ctx;
        [self record:offset + chunkSize];
        [self nextTask:offset + chunkSize retriedTimes:retried host:host];
    };
    if (offset % kQNBlockSize == 0) {
        UInt32 blockSize = [self calcBlockSize:offset];
        [self makeBlock:host offset:offset blockSize:blockSize chunkSize:chunkSize progress:progressBlock complete:completionHandler];
        return;
    }
    NSString *context = _contexts[offset / kQNBlockSize];
    [self putChunk:host offset:offset size:chunkSize context:context progress:progressBlock complete:completionHandler];
}

- (UInt32)calcPutSize:(UInt32)offset {
    UInt32 left = self.size - offset;
    return left < _config.chunkSize ? left : _config.chunkSize;
}

- (UInt32)calcBlockSize:(UInt32)offset {
    UInt32 left = self.size - offset;
    return left < kQNBlockSize ? left : kQNBlockSize;
}

- (void)makeBlock:(NSString *)uphost
           offset:(UInt32)offset
        blockSize:(UInt32)blockSize
        chunkSize:(UInt32)chunkSize
         progress:(QNInternalProgressBlock)progressBlock
         complete:(QNCompleteBlock)complete {
    NSData *data = [self.file read:offset size:chunkSize];
    NSString *url = [[NSString alloc] initWithFormat:@"%@/mkblk/%u", uphost, (unsigned int)blockSize];
    _chunkCrc = [QNCrc32 data:data];
    [self post:url withData:data withCompleteBlock:complete withProgressBlock:progressBlock];
}

- (void)putChunk:(NSString *)uphost
          offset:(UInt32)offset
            size:(UInt32)size
         context:(NSString *)context
        progress:(QNInternalProgressBlock)progressBlock
        complete:(QNCompleteBlock)complete {
    NSData *data = [self.file read:offset size:size];
    UInt32 chunkOffset = offset % kQNBlockSize;
    NSString *url = [[NSString alloc] initWithFormat:@"%@/bput/%@/%u", uphost, context, (unsigned int)chunkOffset];
    _chunkCrc = [QNCrc32 data:data];
    [self post:url withData:data withCompleteBlock:complete withProgressBlock:progressBlock];
}

- (void)makeFile:(NSString *)uphost
        complete:(QNCompleteBlock)complete {
    NSString *mime = [[NSString alloc] initWithFormat:@"/mimeType/%@", [QNUrlSafeBase64 encodeString:self.option.mimeType]];

    __block NSString *url = [[NSString alloc] initWithFormat:@"%@/mkfile/%u%@", uphost, (unsigned int)self.size, mime];

    if (self.key != nil) {
        NSString *keyStr = [[NSString alloc] initWithFormat:@"/key/%@", [QNUrlSafeBase64 encodeString:self.key]];
        url = [NSString stringWithFormat:@"%@%@", url, keyStr];
    }

    [self.option.params enumerateKeysAndObjectsUsingBlock:^(NSString *key, NSString *obj, BOOL *stop) {
        url = [NSString stringWithFormat:@"%@/%@/%@", url, key, [QNUrlSafeBase64 encodeString:obj]];
    }];

    //添加路径
    NSString *fname = [[NSString alloc] initWithFormat:@"/fname/%@", [QNUrlSafeBase64 encodeString:[self fileBaseName]]];
    url = [NSString stringWithFormat:@"%@%@", url, fname];

    NSMutableData *postData = [NSMutableData data];
    NSString *bodyStr = [self.contexts componentsJoinedByString:@","];
    [postData appendData:[bodyStr dataUsingEncoding:NSUTF8StringEncoding]];
    [self post:url withData:postData withCompleteBlock:complete withProgressBlock:nil];
}

#pragma mark - 处理文件路径
- (NSString *)fileBaseName {
    return [[_file path] lastPathComponent];
}

- (void)post:(NSString *)url
             withData:(NSData *)data
    withCompleteBlock:(QNCompleteBlock)completeBlock
    withProgressBlock:(QNInternalProgressBlock)progressBlock {
    [_httpManager post:url withData:data withParams:nil withHeaders:_headers withCompleteBlock:completeBlock withProgressBlock:progressBlock withCancelBlock:_option.cancellationSignal withAccess:_access];
}

- (void)run {
    @autoreleasepool {
        UInt32 offset = [self recoveryFromRecord];
        [self nextTask:offset retriedTimes:0 host:[_config.zone up:_token isHttps:_config.useHttps frozenDomain:nil]];
    }
}

@end