/*

     File: GetMetadataForFile.m

 Abstract: This files contains an implementation of GetMetadataForFile, which reads metadata from our custom file format and returns it in a dictionary, suitable for use by Spotlight.

  Version: 1.1

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 */

#include <CoreFoundation/CoreFoundation.h>

#include <CoreServices/CoreServices.h> 

#include <Foundation/Foundation.h>

#include "Transaction.h"

/* -----------------------------------------------------------------------------

Step 1

Set the UTI types the importer supports

Modify the CFBundleDocumentTypes entry in Info.plist to contain

an array of Uniform Type Identifiers (UTI) for the LSItemContentTypes 

that your importer can handle

----------------------------------------------------------------------------- */

/* -----------------------------------------------------------------------------

Step 2 

Implement the GetMetadataForFile function

Implement the GetMetadataForFile function below to scrape the relevant

metadata from your document and return it as a CFDictionary using standard keys

(defined in MDItem.h) whenever possible.

----------------------------------------------------------------------------- */

/* -----------------------------------------------------------------------------

Step 3 (optional) 

If you have defined new attributes, update the schema.xml file

Edit the schema.xml file to include the metadata keys that your importer returns.

Add them to the <allattrs> and <displayattrs> elements.

Add any custom types that your importer requires to the <attributes> element

<attribute name="com_mycompany_metadatakey" type="CFString" multivalued="true"/>

----------------------------------------------------------------------------- */

/* -----------------------------------------------------------------------------

Get metadata attributes from file

This function's job is to extract useful information your file format supports

and return it as a dictionary

----------------------------------------------------------------------------- */

Boolean GetMetadataForFile(void *thisInterface, 

               CFMutableDictionaryRef cfAttributes, 

               CFStringRef contentTypeUTI,

               CFStringRef pathToFile)

{

    // saving and opening documents

#define kSpendDocumentType @"iSpend Data Format"

#define kOpeningBalance @"Opening Balance"

#define kTransactions @"Transactions"

    Boolean result = NO;

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    NSData *data = [NSData dataWithContentsOfFile:(NSString *)pathToFile];

    if (data != nil) {

        NSString *errorString;

        NSDictionary *documentDictionary = [NSPropertyListSerialization propertyListFromData:data mutabilityOption:NSPropertyListImmutable format:NULL errorDescription:&errorString];

        if (documentDictionary != nil) {

            // We are going to figure out the metadata information that users can search on

            NSMutableString *allDescriptions = [NSMutableString string];

            NSMutableArray *categories = [NSMutableArray array];

            NSMutableArray *dates = [NSMutableArray array];

            NSArray *transactions = [NSKeyedUnarchiver unarchiveObjectWithData:[documentDictionary objectForKey:kTransactions]];

            if (transactions != nil) {

                int i;

                double openingBalance = [[documentDictionary objectForKey:kOpeningBalance] doubleValue];

                double endingBalance = openingBalance;

                for (i = 0; i < [transactions count]; i++) {

                    Transaction *trans = [transactions objectAtIndex:i];

                    // Keep track of the ending balance

                    endingBalance += [trans amount];

                    // Keep track of all the descriptions combined together for this document

                    NSString *desc = [trans descriptionString];

                    if (desc != nil) {

                        [allDescriptions appendString:desc];

                        [allDescriptions appendString:@"\n"];

                    }

                    // Keep track of each category

                    NSString *category = [trans type];

                    if ((category != nil) && ![categories containsObject:category]) {

                        [categories addObject:category];                        

                    }

                    // And the dates for each item

                    [dates addObject:[trans date]];                    

                }                

                // Toll-free bridging allows us to access the the CFMutableDictionaryRef as an NSMutableDictionary:

                NSMutableDictionary *attributes = (NSMutableDictionary *)cfAttributes;

                // Fill in the values for the keys.

                [attributes setObject:[NSNumber numberWithDouble:endingBalance] forKey:@"com_apple_ispendBalance"];

                [attributes setObject:categories forKey:@"com_apple_ispendCategories"];

                [attributes setObject:dates forKey:@"com_apple_ispendDates"];

                [attributes setObject:allDescriptions forKey:(id)kMDItemTextContent];

            }

            result = YES;

        } else {

            NSLog(@"Failed to import %@ because %@", pathToFile, errorString);

        }

    } else {

        NSLog(@"Failed to import %@", pathToFile);

    }    

    [pool release];

    return result;

}