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//
// Wrapper.m
// WrapperTest
//
// Created by Adrian on 10/18/08.
// Copyright 2008 Adrian Kosmaczewski. All rights reserved.
//

#import "Wrapper.h"

@interface Wrapper (Private)
- (void)startConnection:(NSURLRequest *)request;
@end

@implementation Wrapper

@synthesize receivedData = _receivedData;
@synthesize asynchronous = _asynchronous;
@synthesize mimeType = _mimeType;
@synthesize username = _username;
@synthesize password = _password;
@synthesize delegate = _delegate;
@synthesize conn = _conn;

#pragma mark - Constructor and destructor

- (id)init
{
    if(self = [super init])
    {
        self.receivedData = [NSMutableData data];
        self.conn = nil;

        self.asynchronous = YES;
        self.mimeType = @"text/html";
        self.delegate = nil;
        self.username = @"";
        self.password = @"";
    }

    return self;
}

- (void)dealloc
{
    _delegate = nil;
    [_receivedData release];
    [_mimeType release];
    [_username release];
    [_password release];
    [_conn release];
    [super dealloc];
}

#pragma mark -
#pragma mark Public methods

- (void)sendRequestTo:(NSURL *)url usingVerb:(NSString *)verb withParameters:(NSDictionary *)parameters
{
    NSData *body = nil;
    NSMutableString *params = nil;
    NSString *contentType = @"text/html; charset=utf-8";
    NSURL *finalURL = url;
    if (parameters != nil)
    {
        params = [[NSMutableString alloc] init];
        for (id key in parameters)
        {
            NSString *encodedKey = [key stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
            CFStringRef value = (CFStringRef)[[parameters objectForKey:key] copy];
            // Escape even the "reserved" characters for URLs
            // as defined in http://www.ietf.org/rfc/rfc2396.txt
            CFStringRef encodedValue = CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,
                                                                               value,
                                                                               NULL,
                                                                               (CFStringRef)@";/?:@&=+$,",
                                                                               kCFStringEncodingUTF8);
            [params appendFormat:@"%@=%@&", encodedKey, encodedValue];
            CFRelease(value);
            CFRelease(encodedValue);
        }
        [params deleteCharactersInRange:NSMakeRange([params length] - 1, 1)];
    }
    
    if ([verb isEqualToString:@"POST"] || [verb isEqualToString:@"PUT"])
    {
        contentType = @"application/x-www-form-urlencoded; charset=utf-8";
        body = [params dataUsingEncoding:NSUTF8StringEncoding];
    }
    else
    {
        if (parameters != nil)
        {
            NSString *urlWithParams = [[url absoluteString] stringByAppendingFormat:@"?%@", params];
            finalURL = [NSURL URLWithString:urlWithParams];
        }
    }

    NSMutableDictionary* headers = [[[NSMutableDictionary alloc] init] autorelease];
    [headers setValue:contentType forKey:@"Content-Type"];
    [headers setValue:self.mimeType forKey:@"Accept"];
    [headers setValue:@"no-cache" forKey:@"Cache-Control"];
    [headers setValue:@"no-cache" forKey:@"Pragma"];
    [headers setValue:@"close" forKey:@"Connection"]; // Avoid HTTP 1.1 "keep alive" for the connection

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:finalURL
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:60.0];
    [request setHTTPMethod:verb];
    [request setAllHTTPHeaderFields:headers];
    if (parameters != nil)
    {
        [request setHTTPBody:body];
    }
    [params release];
    [self startConnection:request];
}

- (void)uploadData:(NSData *)data toURL:(NSURL *)url
{
    // File upload code adapted from http://www.cocoadev.com/index.pl?HTTPFileUpload
    // and http://www.cocoadev.com/index.pl?HTTPFileUploadSample

    NSString* stringBoundary = [NSString stringWithString:@"0xKhTmLbOuNdArY"];
    
    NSMutableDictionary* headers = [[[NSMutableDictionary alloc] init] autorelease];
    [headers setValue:@"no-cache" forKey:@"Cache-Control"];
    [headers setValue:@"no-cache" forKey:@"Pragma"];
    [headers setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", stringBoundary] forKey:@"Content-Type"];
    
    NSMutableURLRequest* request = [NSMutableURLRequest requestWithURL:url
                                                           cachePolicy:NSURLRequestUseProtocolCachePolicy
                                                       timeoutInterval:60.0];
    [request setHTTPMethod:@"POST"];
    [request setAllHTTPHeaderFields:headers];
    
    NSMutableData* postData = [NSMutableData dataWithCapacity:[data length] + 512];
    [postData appendData:[[NSString stringWithFormat:@"--%@\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [postData appendData:[@"Content-Disposition: form-data; name=\"image\"; filename=\"test.bin\"\r\n\r\n"
                          dataUsingEncoding:NSUTF8StringEncoding]];
    [postData appendData:data];
    [postData appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n", stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [request setHTTPBody:postData];
    
    [self startConnection:request];
}

- (void)cancelConnection
{
    [self.conn cancel];
    self.conn = nil;
}

- (NSDictionary *)responseAsPropertyList
{
    NSString *errorStr = nil;
    NSPropertyListFormat format;
    NSDictionary *propertyList = [NSPropertyListSerialization propertyListFromData:self.receivedData
                                                                  mutabilityOption:NSPropertyListImmutable
                                                                            format:&format
                                                                  errorDescription:&errorStr];
    [errorStr release];
    return propertyList;
}

- (NSString *)responseAsText
{
    return [[[NSString alloc] initWithData:self.receivedData
                                 encoding:NSUTF8StringEncoding] autorelease];
}

#pragma mark -
#pragma mark Private methods

- (void)startConnection:(NSURLRequest *)request
{
    if (self.asynchronous)
    {
        [self cancelConnection];
        self.conn = [[[NSURLConnection alloc] initWithRequest:request
                                                     delegate:self
                                             startImmediately:YES] autorelease];
        
        if (!self.conn)
        {
            if ([self.delegate respondsToSelector:@selector(wrapper:didFailWithError:)])
            {
                NSMutableDictionary* info = [NSMutableDictionary dictionaryWithObject:[request URL] forKey:NSURLErrorFailingURLStringErrorKey];
                [info setObject:@"Could not open connection" forKey:NSLocalizedDescriptionKey];
                NSError* error = [NSError errorWithDomain:@"Wrapper" code:1 userInfo:info];
                [self.delegate wrapper:self didFailWithError:error];
            }
        }
    }
    else
    {
        NSURLResponse* response = [[[NSURLResponse alloc] init] autorelease];
        NSError* error = nil;
        NSData *data = [NSURLConnection sendSynchronousRequest:request
                                             returningResponse:&response
                                                         error:&error];
        [self.receivedData appendData:data];
    }
}

#pragma mark -
#pragma mark NSURLConnection delegate methods

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
    NSInteger count = [challenge previousFailureCount];
    if (count == 0)
    {
        NSURLCredential* credential = [[NSURLCredential credentialWithUser:self.username
                                                                  password:self.password
                                                               persistence:NSURLCredentialPersistenceNone] autorelease];
        [[challenge sender] useCredential:credential
               forAuthenticationChallenge:challenge];
    }
    else
    {
        [[challenge sender] cancelAuthenticationChallenge:challenge];
        if ([self.delegate respondsToSelector:@selector(wrapperHasBadCredentials:)])
        {
            [self.delegate wrapperHasBadCredentials:self];
        }
    }
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{
    NSHTTPURLResponse* httpResponse = (NSHTTPURLResponse*)response;
    int statusCode = [httpResponse statusCode];
    switch (statusCode)
    {
        case 200:
            break;

        case 201:
        {
            NSString* url = [[httpResponse allHeaderFields] objectForKey:@"Location"];
            if ([self.delegate respondsToSelector:@selector(wrapper:didCreateResourceAtURL:)])
            {
                [self.delegate wrapper:self didCreateResourceAtURL:url];
            }
            break;
        }
            
        // Here you could add more status code handling... for example 404 (not found),
        // 204 (after a PUT or a DELETE), 500 (server error), etc... with the
        // corresponding delegate methods called as required.
        
        default:
        {
            if ([self.delegate respondsToSelector:@selector(wrapper:didReceiveStatusCode:)])
            {
                [self.delegate wrapper:self didReceiveStatusCode:statusCode];
            }
            break;
        }
    }
    [self.receivedData setLength:0];
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [self.receivedData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
    [self cancelConnection];
    if ([self.delegate respondsToSelector:@selector(wrapper:didFailWithError:)])
    {
        [self.delegate wrapper:self didFailWithError:error];
    }
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    [self cancelConnection];
    if ([self.delegate respondsToSelector:@selector(wrapper:didRetrieveData:)])
    {
        [self.delegate wrapper:self didRetrieveData:self.receivedData];
    }
}

@end
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