/*
 Copyright (c) 2008, 2ndSite Inc.
 All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions are met:
 
 * Redistributions of source code must retain the above copyright notice,
 this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright
 notice, this list of conditions and the following disclaimer in the
 documentation and/or other materials provided with the distribution.
 * Neither the name of the <ORGANIZATION> nor the names of its
 contributors may be used to endorse or promote products derived from this
 software without specific prior written permission.
 
 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#import "FreshbooksAPI.h"
#import "TouchXML.h"
#import "FreshbooksTimerAppDelegate.h"
#import "ProjectDataLoaderOperation.h"
 
 
@implementation FreshbooksAPI
 
static FreshbooksAPI *sharedInstance = nil;
 
@synthesize projectData;
@synthesize timeEntryQueue;
 
- (void)setDomain:(NSString *)newDomain andKey:(NSString *)key {
	if(domain){
		[domain release];
	}
	domain = [newDomain retain];
 
	if(apiKey){
		[apiKey release];
	}
	apiKey = [key retain];
 
	if(apiURL){
		[apiURL release];
	}
	apiURL = [[NSURL URLWithString:[NSString stringWithFormat:@"https://%@:X@%@.freshbooks.com/api/2.1/xml-in", apiKey, domain]] retain];
	NSLog(@"setting url: %@ \n user: %@", apiURL, [apiURL user]);
}
 
- (void) loadProjectDataWithDelegate: (id) delegate {
	if(!operationQueue){
		operationQueue = [[NSOperationQueue alloc] init];
	}
	ProjectDataLoaderOperation *op = [[ProjectDataLoaderOperation alloc] init];
	op.delegate = delegate;
	[operationQueue addOperation:op];
	[op autorelease];
}
 
- (void) loadProjectData {
	NSString *err;
	[self loadProjectDataWithError: &err];
}
 
- (void) _notify {
	[[NSNotificationCenter defaultCenter] postNotificationName:@"ProjectDataChanged" object:self];
}
 
- (BOOL) loadProjectDataWithError: (NSString **)error {
 
	@try{
		NSMutableDictionary *project;
		NSError *err;
 
		NSData *responseData = [self performCall:@"<?xml version=\"1.0\" encoding=\"utf-8\" ?><request method=\"project.list\"></request>"];
 
		CXMLDocument *xmlDoc = [[CXMLDocument alloc] initWithData:responseData options:0 error:&err];
		if([@"ok" caseInsensitiveCompare:[[[xmlDoc rootElement] attributeForName:@"status"] stringValue]] == NSOrderedSame){
			self.projectData = [NSMutableArray array];
			NSArray *projects = [[[[xmlDoc rootElement] elementsForName:@"projects"] objectAtIndex:0] elementsForName:@"project"];
 
			for (int i = 0; i < [projects count]; ++i) {
				project = [NSMutableDictionary dictionary];
				[project setValue:[[[[projects objectAtIndex:i] elementsForName:@"project_id"] objectAtIndex:0] stringValue] forKey:@"id"];
				[project setValue:[[[[projects objectAtIndex:i] elementsForName:@"name"] objectAtIndex:0] stringValue] forKey:@"name"];
				[project setValue:[self getTasksForProject:[project valueForKey:@"id"]] forKey:@"tasks"];
				[projectData addObject:project];
			}
 
			FreshbooksTimerAppDelegate *appdel = [[UIApplication sharedApplication] delegate];
			NSMutableDictionary *configData = [appdel configData];
			[configData setValue:projectData forKey:@"projectData"];
			[configData setValue:[NSDate date] forKey:@"projectDataDate"];
 
			[self performSelectorOnMainThread:@selector(_notify) withObject:nil waitUntilDone:NO];
			return YES;
		} else {
			*error = [[[[xmlDoc rootElement] elementsForName:@"error"] objectAtIndex:0] stringValue];
			NSLog(@"Failure loading project data");
		}
 
	} @catch (id localException) {
		NSLog(@"barf! %@", [localException name]);
	}
	return NO;
}
 
- (NSMutableArray *) getTasksForProject:(NSString *)projectId {
	NSError *err;
	NSMutableDictionary *task;
	NSMutableArray *tasks = [NSMutableArray array];
	NSData *taskResponseData = [self performCall: [NSString stringWithFormat:
										   @"<?xml version=\"1.0\" encoding=\"utf-8\" ?><request method=\"task.list\"><project_id>%@</project_id></request>", 
										   projectId
										   ]];
 
	CXMLDocument *xmlDoc = [[CXMLDocument alloc] initWithData:taskResponseData options:0 error:&err];
	NSArray *xmlTasks = [[[[xmlDoc rootElement] elementsForName:@"tasks"] objectAtIndex:0] elementsForName:@"task"];
	for (int i = 0; i < [xmlTasks count]; ++i) {
		task = [NSMutableDictionary dictionary];
		[task setValue:[[[[xmlTasks objectAtIndex:i] elementsForName:@"task_id"] objectAtIndex:0] stringValue] forKey:@"id"];
		[task setValue:[[[[xmlTasks objectAtIndex:i] elementsForName:@"name"] objectAtIndex:0] stringValue] forKey:@"name"];
		[tasks addObject:task];
	}
	return tasks;
}
 
- (NSString *) xmlEscape:(NSString *) inputString {
	inputString = [inputString stringByReplacingOccurrencesOfString:@"&" withString:@"&amp;"];
	inputString = [inputString stringByReplacingOccurrencesOfString:@"<" withString:@"&lt;"];
	inputString = [inputString stringByReplacingOccurrencesOfString:@">" withString:@"&gt;"];
	return inputString;
}
 
// Perform syncronous call
- (NSData *) performCall:(NSString *)requestBody {
 
	NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:apiURL];
	[request setHTTPMethod:@"POST"];
	[request setValue:@"Freshbooks iPhone Client 1.0" forHTTPHeaderField:@"X-User-Agent"];
	[request setHTTPBody:[requestBody dataUsingEncoding: NSUTF8StringEncoding]];
 
	NSURLResponse *response;
	NSError *err;
	NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
 
	return responseData;
}
 
// Perform asyncronous call
- (NSURLConnection *)performCall:(NSString *)requestBody withDelegate:(id) delegate {
 
	NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:apiURL];
	[request setHTTPMethod:@"POST"];
	[request setValue:@"Freshbooks iPhone Client 1.0" forHTTPHeaderField:@"X-User-Agent"];
	[request setHTTPBody:[requestBody dataUsingEncoding: NSUTF8StringEncoding]];
 
	NSURLConnection *connection = [NSURLConnection connectionWithRequest:request delegate: delegate];
	return connection;
}
 
 
 
/* SINGLETON STUFF */
#pragma mark SINGLETON
 
+ (FreshbooksAPI*)sharedInstance
{
    @synchronized(self) {
        if (sharedInstance == nil) {
            [[self alloc] init]; // assignment not done here
        }
    }
    return sharedInstance;
}
 
+ (id)allocWithZone:(NSZone *)zone
{
    @synchronized(self) {
        if (sharedInstance == nil) {
            sharedInstance = [super allocWithZone:zone];
            return sharedInstance;  // assignment and return on first allocation
        }
    }
    return nil; //on subsequent allocation attempts return nil
}
 
- (id)init {
	if(self = [super init]){
		FreshbooksTimerAppDelegate *appdel = [[UIApplication sharedApplication] delegate];
		NSMutableDictionary *configData = [appdel configData];
		NSString *ldomain = [configData valueForKeyPath:@"authentication.domain"];
		NSString *lkey = [configData valueForKeyPath:@"authentication.apikey"];
		if(ldomain && lkey){
			[self setDomain:ldomain andKey:lkey];
		}
 
		self.projectData = [configData valueForKey:@"projectData"];
//		NSLog(@"loaded project data: %i projects", self.projectData.count);
//		NSLog(@"Project data is %f seconds old: %@", [[configData valueForKey:@"projectDataDate"] timeIntervalSinceNow], [configData valueForKey:@"projectDataDate"]);
		self.timeEntryQueue = [[SubmissionQueue alloc] initWithQueue:[configData valueForKey:@"queue"]];
 
		// reload data if it is older than one hour
		if([[configData valueForKey:@"projectDataDate"] timeIntervalSinceNow] < -3600.0){
			NSLog(@"project date is older than an hour.  refreshing");
			[self loadProjectDataWithDelegate:nil];
		}
	}
	return self;
}
 
- (id)copyWithZone:(NSZone *)zone
{
    return self;
}
 
- (id)retain
{
    return self;
}
 
- (unsigned)retainCount
{
    return UINT_MAX;  //denotes an object that cannot be released
}
 
- (void)release
{
    //do nothing
}
 
- (id)autorelease
{
    return self;
}
 
@end