#import "MyHTTPConnection.h"
#import "HTTPMessage.h"
#import "HTTPDataResponse.h"
#import "DDNumber.h"
#import "HTTPLogging.h"

#import "MultipartFormDataParser.h"
#import "MultipartMessageHeaderField.h"
#import "HTTPDynamicFileResponse.h"
#import "HTTPFileResponse.h"


// Log levels : off, error, warn, info, verbose
// Other flags: trace
static const int httpLogLevel = HTTP_LOG_LEVEL_VERBOSE; // | HTTP_LOG_FLAG_TRACE;


/**
 * All we have to do is override appropriate methods in HTTPConnection.
 **/

@implementation MyHTTPConnection

- (BOOL)supportsMethod:(NSString *)method atPath:(NSString *)path {
    
	HTTPLogTrace();
	
	// Add support for POST
	
	if ([method isEqualToString:@"POST"])
	{
		if ([path isEqualToString:@"/upload.html"])
		{
			return YES;
		}
	}
	
	return [super supportsMethod:method atPath:path];
}

- (BOOL)expectsRequestBodyFromMethod:(NSString *)method atPath:(NSString *)path {
    
	HTTPLogTrace();
	
	// Inform HTTP server that we expect a body to accompany a POST request
	
	if([method isEqualToString:@"POST"] && [path isEqualToString:@"/upload.html"]) {
        // here we need to make sure, boundary is set in header
        NSString* contentType = [request headerField:@"Content-Type"];
        NSUInteger paramsSeparator = [contentType rangeOfString:@";"].location;
        if( NSNotFound == paramsSeparator ) {
            return NO;
        }
        if( paramsSeparator >= contentType.length - 1 ) {
            return NO;
        }
        NSString* type = [contentType substringToIndex:paramsSeparator];
        if( ![type isEqualToString:@"multipart/form-data"] ) {
            // we expect multipart/form-data content type
            return NO;
        }

		// enumerate all params in content-type, and find boundary there
        NSArray* params = [[contentType substringFromIndex:paramsSeparator + 1] componentsSeparatedByString:@";"];
        for( NSString* param in params ) {
            paramsSeparator = [param rangeOfString:@"="].location;
            if( (NSNotFound == paramsSeparator) || paramsSeparator >= param.length - 1 ) {
                continue;
            }
            NSString* paramName = [param substringWithRange:NSMakeRange(1, paramsSeparator-1)];
            NSString* paramValue = [param substringFromIndex:paramsSeparator+1];
            
            if( [paramName isEqualToString: @"boundary"] ) {
                // let's separate the boundary from content-type, to make it more handy to handle
                [request setHeaderField:@"boundary" value:paramValue];
            }
        }
        // check if boundary specified
        if( nil == [request headerField:@"boundary"] )  {
            return NO;
        }
        return YES;
    }
	return [super expectsRequestBodyFromMethod:method atPath:path];
}

- (NSObject<HTTPResponse> *)httpResponseForMethod:(NSString *)method URI:(NSString *)path {
    
	HTTPLogTrace();
	
	if ([method isEqualToString:@"POST"] && [path isEqualToString:@"/upload.html"]) {

		// this method will generate response with links to uploaded file
		NSMutableString* filesStr = [[NSMutableString alloc] init];

		for( NSString* filePath in uploadedFiles ) {
			//generate links
			[filesStr appendFormat:@"<a href=\"%@\"> %@ </a><br/>",filePath, [filePath lastPathComponent]];
		}
		NSString* templatePath = [[config documentRoot] stringByAppendingPathComponent:@"upload.html"];
		NSDictionary* replacementDict = [NSDictionary dictionaryWithObject:filesStr forKey:@"MyFiles"];
		// use dynamic file response to apply our links to response template
		return [[HTTPDynamicFileResponse alloc] initWithFilePath:templatePath forConnection:self separator:@"%" replacementDictionary:replacementDict];
	}
	if( [method isEqualToString:@"GET"] && [path hasPrefix:@"/upload/"] ) {
		// let download the uploaded files
		return [[HTTPFileResponse alloc] initWithFilePath: [[config documentRoot] stringByAppendingString:path] forConnection:self];
	}
	
	return [super httpResponseForMethod:method URI:path];
}

- (void)prepareForBodyWithSize:(UInt64)contentLength {
	HTTPLogTrace();
	
	// set up mime parser
    NSString* boundary = [request headerField:@"boundary"];
    parser = [[MultipartFormDataParser alloc] initWithBoundary:boundary formEncoding:NSUTF8StringEncoding];
    parser.delegate = self;

	uploadedFiles = [[NSMutableArray alloc] init];
}

- (void)processBodyData:(NSData *)postDataChunk {
	HTTPLogTrace();
    // append data to the parser. It will invoke callbacks to let us handle
    // parsed data.
    [parser appendData:postDataChunk];
}


//-----------------------------------------------------------------
#pragma mark multipart form data parser delegate


- (void) processStartOfPartWithHeader:(MultipartMessageHeader*) header {
	// in this sample, we are not interested in parts, other then file parts.
	// check content disposition to find out filename

    MultipartMessageHeaderField* disposition = [header.fields objectForKey:@"Content-Disposition"];
	NSString* filename = [[disposition.params objectForKey:@"filename"] lastPathComponent];

    if ( (nil == filename) || [filename isEqualToString: @""] ) {
        // it's either not a file part, or
		// an empty form sent. we won't handle it.
		return;
	}

    // 在这里修改文件存储的位置
    
    NSAssert([self.delegate respondsToSelector:@selector(onSetDestinationPathHttpFileTranSportDestination:)], @"Need to add delegate name onSetDestinationPathHttpFileTranSportDestination to add a destinationPath");
    
    if ([self.delegate respondsToSelector:@selector(onSetDestinationPathHttpFileTranSportDestination:)]) {
        self.destinationPath = [self.delegate onSetDestinationPathHttpFileTranSportDestination:self];
        NSAssert(self.destinationPath.length > 0 || self.destinationPath, @"destinationPath can not be nil");
    }
    
    //拼接文件名或者预计文件路径
    NSString* filePath = [self.destinationPath stringByAppendingPathComponent: filename];
    self.filePath = filePath;
    //需要判断是否存在重复文件
    if ([self.delegate respondsToSelector:@selector(onHttpFileDataEstimateDuplicateCanPassTranSportServer:withPath:andFileName:)]) {
        if (![self.delegate onHttpFileDataEstimateDuplicateCanPassTranSportServer:self withPath:self.filePath andFileName:filename]) {
            return;
        };
    }
    
    HTTPLogVerbose(@"Saving file to %@", filePath);
    if(![[NSFileManager defaultManager] createDirectoryAtPath:self.destinationPath withIntermediateDirectories:true attributes:nil error:nil]) {
        HTTPLogError(@"Could not create directory at path: %@", filePath);
    }
    if(![[NSFileManager defaultManager] createFileAtPath:filePath contents:nil attributes:nil]) {
        HTTPLogError(@"Could not create file at path: %@", filePath);
    }
    storeFile = [NSFileHandle fileHandleForWritingAtPath:filePath];
    [uploadedFiles addObject: [NSString stringWithFormat:@"/upload/%@", filename]];
}


- (void) processContent:(NSData*) data WithHeader:(MultipartMessageHeader*) header  {
	// here we just write the output from parser to the file.
	if( storeFile ) {
		[storeFile writeData:data];
	}
}

- (void) processEndOfPartWithHeader:(MultipartMessageHeader*) header {
	// as the file part is over, we close the file.
	[storeFile closeFile];
	storeFile = nil;
}

- (void) processPreambleData:(NSData*) data  {
    // if we are interested in preamble data, we could process it here.

}

- (void) processEpilogueData:(NSData*) data  {
    // if we are interested in epilogue data, we could process it here.
    //用户更新歌曲数量
    [[NSNotificationCenter defaultCenter] postNotificationName:@"processEpilogueData" object:nil];
    if ([self.delegate respondsToSelector:@selector(onHttpFileTranSportServer:successWithPath:)]) {
        [self.delegate onHttpFileTranSportServer:self successWithPath:self.filePath];
    }
}

@end