//
//  PithosAccountNode.m
//  pithos-macos
//
// Copyright 2011 GRNET S.A. All rights reserved.
//
// Redistribution and use in source and binary forms, with or
// without modification, are permitted provided that the following
// conditions are met:
// 
//   1. Redistributions of source code must retain the above
//      copyright notice, this list of conditions and the following
//      disclaimer.
// 
//   2. 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.
// 
// THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``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 GRNET S.A 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.
// 
// The views and conclusions contained in the software and
// documentation are those of the authors and should not be
// interpreted as representing official policies, either expressed
// or implied, of GRNET S.A.

#import "PithosAccountNode.h"
#import "PithosContainerNode.h"
#import "ASIPithosAccountRequest.h"
#import "ASIPithosContainer.h"
#import "ASIDownloadCache.h"
#import "PithosFileUtilities.h"

@implementation PithosAccountNode

#pragma mark -
#pragma mark Object Lifecycle

- (void)dealloc {
    [accountRequest clearDelegatesAndCancel];
    [accountRequest release];
    [containers release];
    [super dealloc];
}

#pragma mark -
#pragma mark Properties

- (NSString *)url {
    if (url == nil) 
        url = [[ASIPithosRequest storageURL] copy];
    return url;
}

- (NSArray *)children {
    @synchronized(self) {
        switch (freshness) {
            case PithosNodeStateFresh:
                break;
            case PithosNodeStateRefreshNeeded:
                freshness = PithosNodeStateRefreshing;
                accountRequest = [[ASIPithosAccountRequest listContainersRequestWithLimit:0 
                                                                                   marker:nil 
                                                                                   shared:shared 
                                                                                    until:nil] retain];
                accountRequest.delegate = self;
                accountRequest.didFinishSelector = @selector(accountRequestFinished:);
                accountRequest.didFailSelector = @selector(accountRequestFailed:);
                accountRequest.downloadCache = [ASIDownloadCache sharedCache];
                [accountRequest startAsynchronous];
                break;
            case PithosNodeStateRefreshing:
                break;
            case PithosNodeStateRefreshFinished:
                if (newChildren) {
                    [children release];
                    children = newChildren;
                    newChildren = nil;
                }
                freshness = PithosNodeStateFresh;
            default:
                break;
        }
        return children;
    }
}

- (NSString *)displayName {
    if (displayName == nil) {
        displayName = [[NSString alloc] initWithString:@"account"];
    }
    return displayName;
}

#pragma mark -
#pragma mark ASIHTTPRequestDelegate

- (void)accountRequestFinished:(ASIPithosAccountRequest *)request {
    NSLog(@"URL: %@", [accountRequest url]);
    NSLog(@"cached: %d", [accountRequest didUseCachedResponse]);
    
    NSArray *someContainers = [accountRequest containers];
    if (containers == nil) {
        containers = [[NSMutableArray alloc] initWithArray:someContainers];
    } else {
        [containers addObjectsFromArray:someContainers];
    }
    if ([someContainers count] < 10000) {
        if (!accountRequest.didUseCachedResponse || ([containers count] != [someContainers count]) || !children) {
            // Save new children
            NSLog(@"using newChildren");
            newChildren = [[NSMutableArray alloc] init];
            for (ASIPithosContainer *container in containers) {
                PithosContainerNode *node = [[[PithosContainerNode alloc] initWithPithosContainer:container] autorelease];
                if (children) {
                    NSUInteger oldIndex = [children indexOfObject:node];
                    if (oldIndex != NSNotFound) {
                        // Use the same pointer value, if possible
                        node = [children objectAtIndex:oldIndex];
                        node.pithosContainer = container;
                    }
                }
                node.parent = self;
                node.shared = shared;
                [newChildren addObject:node];
            }
        }
        // Else cache was used and all results were fetched during this request, so existing children can be reused
        [accountRequest release];
        accountRequest = nil;
        [containers release];
        containers = nil;
        @synchronized(self) {
            freshness = PithosNodeStateRefreshFinished;
        }
        // Notify observers that children are updated
        [[NSNotificationCenter defaultCenter] postNotificationName:@"PithosAccountNodeChildrenUpdated" object:self];
    } else {
        [accountRequest release];
        // Do an additional request to fetch more objects
        accountRequest = [[ASIPithosAccountRequest listContainersRequestWithLimit:0 
                                                                           marker:[[someContainers lastObject] name] 
                                                                           shared:shared 
                                                                            until:nil] retain];
        accountRequest.delegate = self;
        accountRequest.downloadCache = [ASIDownloadCache sharedCache];
        [accountRequest startAsynchronous];
    }
}

- (void)accountRequestFailed:(ASIPithosAccountRequest *)request {
    [PithosFileUtilities httpRequestErrorAlertWithRequest:request];
    [newChildren release];
    newChildren = nil;
    [accountRequest release];
    accountRequest = nil;
    [containers release];
    containers = nil;
    @synchronized(self) {
        freshness = PithosNodeStateRefreshNeeded;
    }
}

@end