/*
 * Copyright (C) 2006, 2007, 2008, 2009 Apple Inc.  All rights reserved.
 * Copyright (C) 2006 Graham Dennis.  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. 
 * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission. 
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 APPLE OR ITS 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.
 */

#import <Cocoa/Cocoa.h>
#import "WebKitNightlyEnablerSparkle.h"

static void enableWebKitNightlyBehaviour() __attribute__ ((constructor));

static NSString *WKNERunState = @"WKNERunState";
static NSString *WKNEShouldMonitorShutdowns = @"WKNEShouldMonitorShutdowns";

typedef enum {
    RunStateShutDown,
    RunStateInitializing,
    RunStateRunning
} WKNERunStates;

static char *webKitAppPath;
static bool extensionBundlesWereLoaded = NO;
static NSSet *extensionPaths = nil;

static int32_t systemVersion()
{
    static SInt32 version = 0;
    if (!version)
        Gestalt(gestaltSystemVersion, &version);

    return version;
}


static void myBundleDidLoad(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
{
    NSBundle *bundle = (NSBundle *)object;
    NSString *bundlePath = [[bundle bundlePath] stringByAbbreviatingWithTildeInPath];
    NSString *bundleFileName = [bundlePath lastPathComponent];

    // Explicitly ignore SIMBL.bundle, as its only purpose is to load extensions
    // on a per-application basis.  It's presence indicates a user has application
    // extensions, but not that any will be loaded into Safari
    if ([bundleFileName isEqualToString:@"SIMBL.bundle"])
        return;

    // If the bundle lives inside a known extension path, flag it as an extension
    NSEnumerator *e = [extensionPaths objectEnumerator];
    NSString *path = nil;
    while ((path = [e nextObject])) {
        if ([bundlePath length] < [path length])
            continue;

        if ([[bundlePath substringToIndex:[path length]] isEqualToString:path]) {
            NSLog(@"Extension detected: %@", bundlePath);
            extensionBundlesWereLoaded = YES;
            break;
        }
    }
}

static void myApplicationWillFinishLaunching(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
{
    CFNotificationCenterRemoveObserver(CFNotificationCenterGetLocalCenter(), &myApplicationWillFinishLaunching, NULL, NULL);
    CFNotificationCenterRemoveObserver(CFNotificationCenterGetLocalCenter(), &myBundleDidLoad, NULL, NULL);
    [extensionPaths release];
    extensionPaths = nil;

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    [userDefaults setInteger:RunStateRunning forKey:WKNERunState];
    [userDefaults synchronize];

    if (extensionBundlesWereLoaded)
        NSRunInformationalAlertPanel(@"Safari extensions detected",
                                     @"Safari extensions were detected on your system.  Extensions are incompatible with nightly builds of WebKit, and may cause crashes or incorrect behavior.  Please disable them if you experience such behavior.", @"Continue",
                                     nil, nil);

    initializeSparkle();
}

static void myApplicationWillTerminate(CFNotificationCenterRef center, void *observer, CFStringRef name, const void *object, CFDictionaryRef userInfo)
{
    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    [userDefaults setInteger:RunStateShutDown forKey:WKNERunState];
    [userDefaults synchronize];
}

NSBundle *webKitLauncherBundle()
{
    NSString *executablePath = [NSString stringWithUTF8String:webKitAppPath];
    NSRange appLocation = [executablePath rangeOfString:@".app/" options:NSBackwardsSearch];
    NSString *appPath = [executablePath substringToIndex:appLocation.location + appLocation.length];
    return [NSBundle bundleWithPath:appPath];
}

extern char **_CFGetProcessPath() __attribute__((weak));
extern OSStatus _RegisterApplication(CFDictionaryRef additionalAppInfoRef, ProcessSerialNumber* myPSN) __attribute__((weak));

static void poseAsWebKitApp()
{
    webKitAppPath = strdup(getenv("WebKitAppPath"));
    if (!webKitAppPath)
        return;

    unsetenv("WebKitAppPath");

    // Set up the main bundle early so it points at Safari.app
    CFBundleGetMainBundle();

    if (systemVersion() < 0x1060) {
        if (!_CFGetProcessPath)
            return;

        // Fiddle with CoreFoundation to have it pick up the executable path as being within WebKit.app
        char **processPath = _CFGetProcessPath();
        *processPath = NULL;
        setenv("CFProcessPath", webKitAppPath, 1);
        _CFGetProcessPath();
        unsetenv("CFProcessPath");
    } else {
        if (!_RegisterApplication)
            return;

        // Register the application with LaunchServices, passing a customized registration dictionary that
        // uses the WebKit launcher as the application bundle.
        NSBundle *bundle = webKitLauncherBundle();
        NSMutableDictionary *checkInDictionary = [[bundle infoDictionary] mutableCopy];
        [checkInDictionary setObject:[bundle bundlePath] forKey:@"LSBundlePath"];
        [checkInDictionary setObject:[checkInDictionary objectForKey:(NSString *)kCFBundleNameKey] forKey:@"LSDisplayName"];
        _RegisterApplication((CFDictionaryRef)checkInDictionary, 0);
        [checkInDictionary release];
    }
}

static BOOL insideSafari4OnTigerTrampoline()
{
    // If we're not on Tiger then we can't be in the trampoline state.
    if ((systemVersion() & 0xFFF0) != 0x1040)
        return NO;

    // If we're running Safari < 4.0 then we can't be in the trampoline state.
    CFBundleRef safariBundle = CFBundleGetMainBundle();
    CFStringRef safariVersion = CFBundleGetValueForInfoDictionaryKey(safariBundle, CFSTR("CFBundleShortVersionString"));
    if ([(NSString *)safariVersion intValue] < 4)
        return NO;

    const char* frameworkPath = getenv("DYLD_FRAMEWORK_PATH");
    if (!frameworkPath)
        frameworkPath = "";

    // If the framework search path is empty or otherwise does not contain the Safari
    // framework's Frameworks directory then we are in the trampoline state.
    const char safariFrameworkSearchPath[] = "/System/Library/PrivateFrameworks/Safari.framework/Frameworks";
    return strstr(frameworkPath, safariFrameworkSearchPath) == 0;
}

static void enableWebKitNightlyBehaviour()
{
    // If we're inside Safari in its trampoline state, it will very shortly relaunch itself.
    // We bail out here so that we'll be called again in the freshly-launched Safari process.
    if (insideSafari4OnTigerTrampoline())
        return;

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

    unsetenv("DYLD_INSERT_LIBRARIES");
    poseAsWebKitApp();

    extensionPaths = [[NSSet alloc] initWithObjects:@"~/Library/InputManagers/", @"/Library/InputManagers/",
                                                    @"~/Library/Application Support/SIMBL/Plugins/", @"/Library/Application Support/SIMBL/Plugins/",
                                                    @"~/Library/Application Enhancers/", @"/Library/Application Enhancers/",
                                                    nil];

    // As of 2008-11 attempting to load Saft would cause a crash on launch, so prevent it from being loaded.
    NSArray *disabledInputManagers = [NSArray arrayWithObjects:@"Saft", nil];

    NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
    NSDictionary *defaultPrefs = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithBool:RunStateShutDown], WKNERunState,
                                                                            [NSNumber numberWithBool:YES], WKNEShouldMonitorShutdowns,
                                                                            disabledInputManagers, @"NSDisabledInputManagers", nil];
    [userDefaults registerDefaults:defaultPrefs];
    if ([userDefaults boolForKey:WKNEShouldMonitorShutdowns]) {
        WKNERunStates savedState = (WKNERunStates)[userDefaults integerForKey:WKNERunState];
        if (savedState == RunStateInitializing) {
            // Use CoreFoundation here as AppKit hasn't been initialized at this stage of Safari's lifetime
            CFOptionFlags responseFlags;
            CFUserNotificationDisplayAlert(0, kCFUserNotificationCautionAlertLevel,
                                           NULL, NULL, NULL,
                                           CFSTR("WebKit failed to open correctly"),
                                           CFSTR("WebKit failed to open correctly on your previous attempt. Please disable any Safari extensions that you may have installed.  If the problem continues to occur, please file a bug report at http://webkit.org/quality/reporting.html"), 
                                           CFSTR("Continue"), NULL, NULL, &responseFlags);
        }
        else if (savedState == RunStateRunning) {
            NSLog(@"WebKit failed to shut down cleanly.  Checking for Safari extensions.");
            CFNotificationCenterAddObserver(CFNotificationCenterGetLocalCenter(), &myBundleDidLoad,
                                            myBundleDidLoad, (CFStringRef) NSBundleDidLoadNotification,
                                            NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
        }
    }
    [userDefaults setInteger:RunStateInitializing forKey:WKNERunState];
    [userDefaults synchronize];

    CFNotificationCenterAddObserver(CFNotificationCenterGetLocalCenter(), &myApplicationWillFinishLaunching,
                                    myApplicationWillFinishLaunching, (CFStringRef) NSApplicationWillFinishLaunchingNotification,
                                    NULL, CFNotificationSuspensionBehaviorDeliverImmediately);
    CFNotificationCenterAddObserver(CFNotificationCenterGetLocalCenter(), &myApplicationWillTerminate,
                                    myApplicationWillTerminate, (CFStringRef) NSApplicationWillTerminateNotification,
                                    NULL, CFNotificationSuspensionBehaviorDeliverImmediately);

    NSLog(@"WebKit %@ initialized.", [webKitLauncherBundle() objectForInfoDictionaryKey:@"CFBundleShortVersionString"]);

    [pool release];
}