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//
// OATokenManager.m
// OAuthConsumer
//
// Created by Alberto García Hierro on 01/09/08.
// Copyright 2008 Alberto García Hierro. All rights reserved.
// bynotes.com

#import "OAConsumer.h"
#import "OAToken.h"
#import "OAProblem.h"
#import "OACall.h"
#import "OATokenManager.h"

@interface OATokenManager (Private)

- (void)callProblem:(OACall *)call problem:(OAProblem *)problem;
- (void)callError:(OACall *)call error:(NSError *)error;
- (void)callFinished:(OACall *)call body:(NSString *)body;

- (void)dispatch;
- (void)performCall:(OACall *)aCall;

- (void)requestToken;
- (void)requestTokenReceived;
- (void)exchangeToken;
- (void)renewToken;
- (void)accessTokenReceived;
- (void)setAccessToken:(OAToken *)token;
- (void)deleteSavedRequestToken;

- (OACall *)queue;
- (void)enqueue:(OACall *)call selector:(SEL)selector;
- (void)dequeue:(OACall *)call;
- (SEL)getSelector:(OACall *)call;

@end

@implementation OATokenManager

- (id)init {
return [self initWithConsumer:nil
token:nil
oauthBase:nil
realm:nil
callback:nil
delegate:nil];
}

- (id)initWithConsumer:(OAConsumer *)aConsumer token:(OAToken *)aToken oauthBase:(const NSString *)base
realm:(const NSString *)aRealm callback:(const NSString *)aCallback
delegate:(NSObject <OATokenManagerDelegate> *)aDelegate {

if ((self = [super init])) {
consumer = aConsumer;
acToken = nil;
reqToken = nil;
initialToken = aToken;
authorizedTokenKey = nil;
oauthBase = [base copy];
realm = [aRealm copy];
callback = [aCallback copy];
delegate = aDelegate;
calls = [[NSMutableArray alloc] init];
selectors = [[NSMutableArray alloc] init];
delegates = [[NSMutableDictionary alloc] init];
isDispatching = NO;
}

return self;
}

// The application got a new authorized
// request token and is notifying us
- (void)authorizedToken:(NSString *)aKey
{
if (reqToken && [aKey isEqualToString:reqToken.key]) {
[self exchangeToken];
} else {
authorizedTokenKey = aKey;
}
}


// Private functions

// Deal with problems and errors in calls

- (void)call:(OACall *)call failedWithProblem:(OAProblem *)problem
{
/* Always clear the saved request token, just in case */
[self deleteSavedRequestToken];

if ([problem isEqualToProblem:[OAProblem TokenExpired]]) {
/* renewToken checks if it's renewable */
[self renewToken];
} else if ([problem isEqualToProblem:[OAProblem TokenNotRenewable]] ||
[problem isEqualToProblem:[OAProblem TokenRejected]]) {
/* This token may have been revoked by the user, get a new one
after removing the stored requestToken, since the problem may be in
it */
[self setAccessToken:nil];
[self requestToken];
} else if ([problem isEqualToProblem:[OAProblem NonceUsed]]) {
/* Just repeat this request */
[self performCall:call];
} else {
/* Non-recoverable error, tell the delegate and dequeue the call
if appropiate */
if([delegate tokenManager:self failedCall:call withProblem:problem]) {
[self dequeue:call];
}
@synchronized(self) {
isDispatching = NO;
}
}
}

- (void)call:(OACall *)call failedWithError:(NSError *)error
{
if([delegate tokenManager:self failedCall:call withError:error]) {
[self dequeue:call];
}
@synchronized(self) {
isDispatching = NO;
}
}

// When a call finish, notify the delegate
- (void)callFinished:(OACall *)call body:(NSString *)body
{
SEL selector = [self getSelector:call];
id deleg = [delegates objectForKey:[NSString stringWithFormat:@"%p", call]];
if (deleg) {
[deleg performSelector:selector withObject:body];
[delegates removeObjectForKey:call];
} else {
[delegate performSelector:selector withObject:body];
}
@synchronized(self) {
isDispatching = NO;
}
[self dequeue:call];
[self dispatch];
}

- (OACall *)queue {
id obj = nil;
@synchronized(calls) {
if ([calls count]) {
obj = [calls objectAtIndex:0];
}
}
return obj;
}

- (void)enqueue:(OACall *)call selector:(SEL)selector {
NSUInteger idx = [calls indexOfObject:call];
if (idx == NSNotFound) {
@synchronized(calls) {
[calls addObject:call];
[selectors addObject:NSStringFromSelector(selector)];
}
}
}

- (void)dequeue:(OACall *)call {
NSUInteger idx = [calls indexOfObject:call];
if (idx != NSNotFound) {
@synchronized(calls) {
[calls removeObjectAtIndex:idx];
[selectors removeObjectAtIndex:idx];
}
}
}

- (SEL)getSelector:(OACall *)call
{
NSUInteger idx = [calls indexOfObject:call];
if (idx != NSNotFound) {
return NSSelectorFromString([selectors objectAtIndex:idx]);
}
return 0;
}

// Token management functions

// Requesting a new token

// Gets a new token and opens the default
// browser for authorizing it. The application
// is expected to call authorizedToken when it
// gets the authorized token back

- (void)requestToken
{
/* Try to load an access token from settings */
OAToken *atoken = [[OAToken alloc] initWithUserDefaultsUsingServiceProviderName:oauthBase prefix:[@"access:" stringByAppendingString:realm]];
if (atoken && [atoken isValid]) {
[self setAccessToken:atoken];
return;
}
/* Try to load a stored requestToken from
settings (useful for iPhone) */
OAToken *token = [[OAToken alloc] initWithUserDefaultsUsingServiceProviderName:oauthBase prefix:[@"request:" stringByAppendingString:realm]];
/* iPhone specific, the manager must have got the authorized token before reaching this point */
NSLog(@"request token in settings %@", token);
if (token && token.key && [authorizedTokenKey isEqualToString:token.key]) {
reqToken = token;
[self exchangeToken];
return;
}
if ([delegate respondsToSelector:@selector(tokenManagerNeedsToken:)]) {
if (![delegate tokenManagerNeedsToken:self]) {
return;
}
}
OACall *call = [[OACall alloc] initWithURL:[NSURL URLWithString:[oauthBase stringByAppendingString:@"request_token"]] method:@"POST"];
[call perform:consumer
token:initialToken
realm:realm
delegate:self
didFinish:@selector(requestTokenReceived:body:)];

}

- (void)requestTokenReceived:(OACall *)call body:(NSString *)body
{
/* XXX: Check if token != nil */
NSLog(@"Received request token %@", body);
OAToken *token = [[OAToken alloc] initWithHTTPResponseBody:body];
if (token) {
reqToken = token;

[reqToken storeInUserDefaultsWithServiceProviderName:oauthBase prefix:[@"request:" stringByAppendingString:realm]];
/* Save the token in case we exit and start again
before the token is authorized (useful for iPhone) */
NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"%@authorize?oauth_token=%@&oauth_callback=%@",
oauthBase, token.key, callback]];
[[UIApplication sharedApplication] openURL:url];

}
}

// Exchaing a request token for an access token

// Exchanges the current authorized
// request token for an access token
- (void)exchangeToken
{
if (!reqToken) {
[self requestToken];
return;
}
NSURL *url = [NSURL URLWithString:[oauthBase stringByAppendingString:@"access_token"]];
OACall *call = [[OACall alloc] initWithURL:url method:@"POST"];
[call perform:consumer
token:reqToken
realm:realm
delegate:self
didFinish:@selector(accessTokenReceived:body:)];
}

- (void)accessTokenReceived:(OACall *)call body:(NSString *)body
{
OAToken *token = [[OAToken alloc] initWithHTTPResponseBody:body];
[self setAccessToken:token];
}

- (void)renewToken {
NSLog(@"Renewing token");
if (!acToken || ![acToken isRenewable]) {
[self requestToken];
return;
}
acToken.forRenewal = YES;
NSURL *url = [NSURL URLWithString:[oauthBase stringByAppendingString:@"access_token"]];
OACall *call = [[OACall alloc] initWithURL:url method:@"POST"];
[call perform:consumer
token:acToken
realm:realm
delegate:self
didFinish:@selector(accessTokenReceived:body:)];
}

- (void)setAccessToken:(OAToken *)token {
/* Remove the stored requestToken which generated
this access token */
[self deleteSavedRequestToken];
if (token) {
acToken = token;
[acToken storeInUserDefaultsWithServiceProviderName:oauthBase prefix:[@"access:" stringByAppendingString:realm]];
@synchronized(self) {
isDispatching = NO;
}
[self dispatch];
} else {
/* Clear the in-memory and saved access tokens */
acToken = nil;
[OAToken removeFromUserDefaultsWithServiceProviderName:oauthBase prefix:[@"access:" stringByAppendingString:realm]];
}
}

- (void)deleteSavedRequestToken {
[OAToken removeFromUserDefaultsWithServiceProviderName:oauthBase prefix:[@"request:" stringByAppendingString:realm]];
reqToken = nil;
}

- (void)performCall:(OACall *)aCall {
NSLog(@"Performing call");
[aCall perform:consumer
token:acToken
realm:realm
delegate:self
didFinish:@selector(callFinished:body:)];
}

- (void)dispatch {
OACall *call = [self queue];
if (!call) {
return;
}
@synchronized(self) {
if (isDispatching) {
return;
}
isDispatching = YES;
}
NSLog(@"Started dispatching");
if(acToken) {
[self performCall:call];
} else if(reqToken) {
[self exchangeToken];
} else {
[self requestToken];
}
}

- (void)fetchData:(NSString *)aURL method:(NSString *)aMethod parameters:(NSArray *)theParameters
files:(NSDictionary *)theFiles finished:(SEL)didFinish delegate:(NSObject*)aDelegate {

OACall *call = [[OACall alloc] initWithURL:[NSURL URLWithString:aURL]
method:aMethod
parameters:theParameters
files:theFiles];
NSLog(@"Received request for: %@", aURL);
[self enqueue:call selector:didFinish];
if (aDelegate) {
[delegates setObject:aDelegate forKey:[NSString stringWithFormat:@"%p", call]];
}
[self dispatch];
}

- (void)fetchData:(NSString *)aURL method:(NSString *)aMethod parameters:(NSArray *)theParameters
files:(NSDictionary *)theFiles finished:(SEL)didFinish {

[self fetchData:aURL method:aMethod parameters:theParameters files:theFiles
finished:didFinish delegate:nil];
}


- (void)fetchData:(NSString *)aURL method:(NSString *)aMethod parameters:(NSArray *)theParameters
finished:(SEL)didFinish {

[self fetchData:aURL method:aMethod parameters:theParameters files:nil finished:didFinish];
}

- (void)fetchData:(NSString *)aURL parameters:(NSArray *)theParameters files:(NSDictionary *)theFiles
finished:(SEL)didFinish {

[self fetchData:aURL method:@"POST" parameters:theParameters files:theFiles finished:didFinish];
}

- (void)fetchData:(NSString *)aURL finished:(SEL)didFinish {
[self fetchData:aURL method:nil parameters:nil files:nil finished:didFinish];
}


@end
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