/*
 * This file is a part of program XcodeCapp
 * Copyright (C) 2011  Antoine Mercadal (<primalmotion@archipelproject.org>)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#import "AppController.h"
#import "FSEventCallback.h"
#import "macros.h"


/*!
 This is the FSEvent callback for 10.7
 */
void fsevents_callback(ConstFSEventStreamRef streamRef,
                       void *userData,
                       size_t numEvents,
                       void *eventPaths,
                       const FSEventStreamEventFlags eventFlags[],
                       const FSEventStreamEventId eventIds[])
{    
    TNXCodeCapp *xcc = (TNXCodeCapp *)userData;
    BOOL useFileBasedListening = [xcc supportsFileBasedListening];
    size_t i;
    
    for (i = 0; i < numEvents; i++)
    {
        NSString *path = [[(NSArray *)eventPaths objectAtIndex:i] stringByStandardizingPath];
        BOOL isDir = NO;

        [[NSFileManager defaultManager] fileExistsAtPath:path isDirectory:&isDir];

        if (useFileBasedListening)
        {
            // kFSEventStreamEventFlagItemIsFile = 0x00010000
            // kFSEventStreamEventFlagItemRemoved = 0x00000200
            if (eventFlags[i] & 0x00010000 && eventFlags[i] & 0x00000200)
            {
                [xcc tidyShadowedFiles:path];
            }

            // kFSEventStreamEventFlagItemIsFile = 0x00010000
            if (!(eventFlags[i] & 0x00010000)
                || [xcc isPathMatchingIgnoredPaths:path]
                || (![xcc isXIBFile:path] && ![xcc isObjJFile:path] && ![xcc isXCCIgnoreFile:path]))
                continue;

            // kFSEventStreamEventFlagItemRemoved = 0x00000200
            if (eventFlags[i] & 0x00000200)
            {
                DLog(@"event type: kFSEventStreamEventFlagItemRemoved for path %@", path);
                [xcc handleFileRemoval:path];
            }

            // kFSEventStreamEventFlagItemCreated = 0x00000200
            // kFSEventStreamEventFlagItemModified = 0x00001000
            if (eventFlags[i] & 0x00000100 || eventFlags[i] & 0x00001000)
            {
                DLog(@"event type: kFSEventStreamEventFlagItemCreated or kFSEventStreamEventFlagItemModified for path %@", path);
                [xcc handleFileModification:path notify:YES];
            }

            // kFSEventStreamEventFlagItemInodeMetaMod = 0x00000400
            if (eventFlags[i] & 0x00000400 && [xcc reactToInodeModification])
            {
                DLog(@"event type: kFSEventStreamEventFlagItemInodeMetaMod for path %@", path);
                [xcc handleFileModification:path notify:YES];
            }

            // kFSEventStreamEventFlagItemRenamed = 0x00000800
            if (eventFlags[i] & 0x00000800)
            {
                if (![[NSFileManager defaultManager] fileExistsAtPath:path])
                {
                    DLog(@"event type: kFSEventStreamEventFlagItemRenamed for path %@ (removed origin)", path);
                    [xcc handleFileRemoval:path];
                }
                else
                {
                    DLog(@"event type: kFSEventStreamEventFlagItemRenamed for path %@ (added destination)", path);
                    [xcc handleFileModification:path notify:YES];
                }
            }
        }
        else
        {
            NSArray *subpaths = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:path error:NULL];

            // If for some reasons the path is not a directory,
            // we don't want to deal with it in this mode.
            if (!isDir)
                continue;

            [xcc tidyShadowedFiles:path];

            for (NSString *subpath in subpaths)
            {
                NSString *fullPath = [[NSString stringWithFormat:@"%@/%@", path, subpath] stringByStandardizingPath];

                if ([xcc isPathMatchingIgnoredPaths:fullPath]
                    || (![xcc isXIBFile:fullPath] && ![xcc isObjJFile:fullPath] && ![xcc isXCCIgnoreFile:fullPath]))
                    continue;

                NSDate *lastModifiedDate = [xcc lastModificationDateForPath:fullPath];
                NSDictionary *fileAttributes = [[NSFileManager defaultManager] attributesOfItemAtPath:fullPath error:nil];
                NSDate *fileModDate = [fileAttributes objectForKey:NSFileModificationDate];

                if ([fileModDate compare:lastModifiedDate] == NSOrderedDescending)
                {
                    [xcc updateLastModificationDate:fileModDate forPath:fullPath];
                    [xcc handleFileModification:fullPath notify:YES];
                }
            }
        }

        [xcc updateLastEventId:eventIds[i]];
    }
}