/*
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing,
  software distributed under the License is distributed on an
  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
  KIND, either express or implied.  See the License for the
  specific language governing permissions and limitations
  under the License.
 */

#import "CMISAtomFeedParser.h"
#import "CMISAtomLink.h"

@interface CMISAtomFeedParser ()
@property (nonatomic, strong, readwrite) NSData *feedData;
@property (nonatomic, strong, readwrite) NSMutableArray *internalEntries;
@property (readwrite) int numItems;
@property (nonatomic, strong, readwrite) NSMutableSet *feedLinkRelations;
@property (nonatomic, strong, readwrite) id childParserDelegate;
@property (nonatomic, strong) NSMutableString *string;
@end

@implementation CMISAtomFeedParser


- (id)initWithData:(NSData*)feedData
{
    self = [super init];
    if (self) {
        self.feedData = feedData;
        self.feedLinkRelations = [NSMutableSet set];
    }
    
    return self;
}

- (NSArray *)entries
{
    if (self.internalEntries != nil) {
        return [NSArray arrayWithArray:self.internalEntries];
    } else {
        return nil;
    }
}

- (CMISLinkRelations *)linkRelations
{
    return [[CMISLinkRelations alloc] initWithLinkRelationSet:self.feedLinkRelations];
}

- (BOOL)parseAndReturnError:(NSError **)error;
{
    BOOL parseSuccessful = YES;
    
    // create objects to populate during parse
    self.internalEntries = [NSMutableArray array];
    
    // parse the AtomPub data
    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:self.feedData];
    [parser setShouldProcessNamespaces:YES];
    [parser setDelegate:self];
    parseSuccessful = [parser parse];
    
    if (!parseSuccessful) {
        if (error) {
            *error = [parser parserError];
        }
    }

    return parseSuccessful;
}

#pragma mark -
#pragma mark NSXMLParser delegate methods

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict 
{
    if ([elementName isEqualToString:kCMISAtomEntry]) {
        // Delegate parsing of AtomEntry element to the entry child parser
        self.childParserDelegate = [CMISAtomEntryParser atomEntryParserWithAtomEntryAttributes:attributeDict parentDelegate:self parser:parser];
    } else if ([elementName isEqualToString:kCMISAtomEntryLink]) {
        CMISAtomLink *link = [[CMISAtomLink alloc] init];
        [link setValuesForKeysWithDictionary:attributeDict];
        [self.feedLinkRelations addObject:link];
    }
    
    self.string = [NSMutableString string];
}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    [self.string appendString:string];
}


- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName 
{
    if ([elementName isEqualToString:kCMISAtomFeedNumItems]) {
        self.numItems = [self.string intValue];
    }

    self.string = nil;
}


#pragma mark -
#pragma mark CMISAtomEntryParserDelegate Methods

- (void)cmisAtomEntryParser:(CMISAtomEntryParser *)entryParser didFinishParsingCMISObjectData:(CMISObjectData *)cmisObjectData
{
    [self.internalEntries addObject:cmisObjectData];
}

@end