//
//  PithosNode.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 "PithosContainerNode.h"
#import "PithosObjectNode.h"
#import "PithosSubdirNode.h"
#import "ASIPithosContainerRequest.h"
#import "ASIPithosContainer.h"
#import "ASIPithosObject.h"
#import "ASIDownloadCache.h"

static NSImage *sharedIcon = nil;

@implementation PithosContainerNode
@synthesize pithosContainer;

+ (void)initialize {
	if (self == [PithosContainerNode class])
        sharedIcon = [[NSImage imageNamed:@"container"] retain];
}

#pragma mark -
#pragma mark Object Lifecycle

- (id)initWithPithosContainer:(ASIPithosContainer *)aPithosContainer icon:(NSImage *)anIcon {
    if ((self = [super init])) {
        pithosContainer = [aPithosContainer retain];
        prefix = nil;
        icon = [anIcon retain];
        childrenUpdatedNotificationName = @"PithosContainerNodeChildrenUpdated";
    }
    return self;
}

- (id)initWithPithosContainer:(ASIPithosContainer *)aPithosContainer {
    return [self initWithPithosContainer:aPithosContainer icon:nil];
}

- (id)initWithContainerName:(NSString *)aContainerName icon:(NSImage *)anIcon {
    ASIPithosContainer *container = [ASIPithosContainer container];
    container.name = aContainerName;
    return [self initWithPithosContainer:container icon:anIcon];
}

- (id)initWithContainerName:(NSString *)aContainerName {
    return [self initWithContainerName:aContainerName icon:nil];
}

- (void)dealloc {
    [containerRequest clearDelegatesAndCancel];
    [containerRequest release];
    [childrenUpdatedNotificationName release];
    [prefix release];
    [objects release];
    [pithosContainer release];
    [super dealloc];
}

#pragma mark -
#pragma mark ASIHTTPRequestDelegate

- (void)requestFinished:(ASIHTTPRequest *)request {
    NSLog(@"URL: %@", [containerRequest url]);
    NSLog(@"cached: %d", [containerRequest didUseCachedResponse]);

    NSArray *someObjects = [containerRequest objects];
    if (objects == nil) {
        objects = [[NSMutableArray alloc] initWithArray:someObjects];
    } else {
        [objects addObjectsFromArray:someObjects];
    }
    if ([someObjects count] < 10000) {
        if (!containerRequest.didUseCachedResponse || ([objects count] != [someObjects count]) || !children) {
            // Save new children
            NSLog(@"using newChildren");
            newChildren = [[NSMutableArray alloc] init];
            for (ASIPithosObject *object in objects) {
                if (object.subdir) {
                    PithosSubdirNode *node = [[[PithosSubdirNode alloc] initWithPithosContainer:pithosContainer pithosObject:object] autorelease];
                    if (children) {
                        NSUInteger oldIndex = [children indexOfObject:node];
                        if (oldIndex != NSNotFound) {
                            // Use the same pointer value, if possible
                            node = [children objectAtIndex:oldIndex];
                            node.pithosContainer = pithosContainer;
                            node.pithosObject = object;
                        }
                    }
                    [newChildren addObject:node];
                } else if (([self class] != [PithosSubdirNode class]) || (![((PithosSubdirNode *)self).pithosObject.name isEqualToString:object.name])) {
                    // XXX the if above removes false objects due to trailing slash
                    // XXX this will change in the server, but it is fixed in the client for now
                    PithosObjectNode *node = [[[PithosObjectNode alloc] initWithPithosContainer:pithosContainer pithosObject:object] autorelease];
                    if (children) {
                        NSUInteger oldIndex = [children indexOfObject:node];
                        if (oldIndex != NSNotFound) {
                            // Use the same pointer value, if possible
                            node = [children objectAtIndex:oldIndex];
                            node.pithosContainer = pithosContainer;
                            node.pithosObject = object;
                        }
                    }
                    [newChildren addObject:node];                                
                }
            }
        }
        // Else cache was used and all results were fetched during this request, so existing children can be reused
        [containerRequest release];
        containerRequest = nil;
        [objects release];
        objects = nil;
        // XXX sort children based on preferences
        @synchronized(self) {
            freshness = PithosNodeStateRefreshFinished;
        }
        // Notify observers that children are updated
        [[NSNotificationCenter defaultCenter] postNotificationName:childrenUpdatedNotificationName object:self];
    } else {
        [containerRequest release];
        // Do an additional request to fetch more objects
        containerRequest = [[ASIPithosContainerRequest listObjectsRequestWithContainerName:pithosContainer.name 
                                                                                     limit:0 
                                                                                    marker:[[someObjects lastObject] name] 
                                                                                    prefix:prefix 
                                                                                 delimiter:@"/" 
                                                                                      path:nil 
                                                                                      meta:nil 
                                                                                    shared:NO 
                                                                                     until:nil] retain];
        containerRequest.delegate = self;
        containerRequest.downloadCache = [ASIDownloadCache sharedCache];
        [containerRequest startAsynchronous];
    }
}

- (void)requestFailed:(ASIHTTPRequest *)request {
    // XXX do something on error, cleanup
    NSLog(@"error:%@", [containerRequest error]);
    [newChildren release];
    newChildren = nil;
    [containerRequest release];
    containerRequest = nil;
    [objects release];
    objects = nil;
    @synchronized(self) {
        freshness = PithosNodeStateRefreshNeeded;
    }
}

#pragma mark -
#pragma mark Properties

- (NSString *)url {
    if (url == nil) 
        url = [[NSString alloc] initWithFormat:@"%@/%@", [ASIPithosRequest storageURL], pithosContainer.name];
    return url;
}

- (NSArray *)children {
    @synchronized(self) {
        switch (freshness) {
            case PithosNodeStateFresh:
                break;
            case PithosNodeStateRefreshNeeded:
                freshness = PithosNodeStateRefreshing;
                containerRequest = [[ASIPithosContainerRequest listObjectsRequestWithContainerName:pithosContainer.name 
                                                                                             limit:0 
                                                                                            marker:nil 
                                                                                            prefix:prefix 
                                                                                         delimiter:@"/" 
                                                                                              path:nil 
                                                                                              meta:nil 
                                                                                            shared:NO 
                                                                                             until:nil] retain];
                containerRequest.delegate = self;
                containerRequest.downloadCache = [ASIDownloadCache sharedCache];
                [containerRequest startAsynchronous];
                break;
            case PithosNodeStateRefreshing:
                break;
            case PithosNodeStateRefreshFinished:
                if (newChildren) {
                    [children release];
                    children = newChildren;
                    newChildren = nil;
                }
                freshness = PithosNodeStateFresh;
            default:
                break;
        }
        return children;
    }
}

- (NSString *)displayName {
    return [[pithosContainer.name copy] autorelease];
}

- (NSImage *)icon {
    if (icon)
        return icon;
    return sharedIcon;
}

@end