//
//  MPMacAppDelegate.m
//  MasterPassword
//
//  Created by Maarten Billemont on 04/03/12.
//  Copyright (c) 2012 Lyndir. All rights reserved.
//

#import "MPMacAppDelegate.h"
#import "MPAppDelegate_Key.h"
#import "MPAppDelegate_Store.h"
#import <Carbon/Carbon.h>
#import <ServiceManagement/ServiceManagement.h>

#define LOGIN_HELPER_BUNDLE_ID @"com.lyndir.lhunath.MasterPassword.Mac.LoginHelper"

@interface MPMacAppDelegate()

@property(nonatomic, strong) NSWindowController *initialWindow;
@end

@implementation MPMacAppDelegate

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wfour-char-constants"
static EventHotKeyID MPShowHotKey = { .signature = 'show', .id = 1 };
static EventHotKeyID MPLockHotKey = { .signature = 'lock', .id = 1 };
#pragma clang diagnostic pop

+ (void)initialize {

    static dispatch_once_t initialize;
    dispatch_once( &initialize, ^{
        [MPMacConfig get];

#ifdef DEBUG
        [PearlLogger get].printLevel = PearlLogLevelDebug;//Trace;
#endif
    } );
}

static OSStatus MPHotKeyHander(EventHandlerCallRef nextHandler, EventRef theEvent, void *userData) {

    // Extract the hotkey ID.
    EventHotKeyID hotKeyID;
    GetEventParameter( theEvent, kEventParamDirectObject, typeEventHotKeyID,
            NULL, sizeof(hotKeyID), NULL, &hotKeyID );

    // Check which hotkey this was.
    if (hotKeyID.signature == MPShowHotKey.signature && hotKeyID.id == MPShowHotKey.id) {
        [((__bridge MPMacAppDelegate *)userData) showPasswordWindow:nil];
        return noErr;
    }
    if (hotKeyID.signature == MPLockHotKey.signature && hotKeyID.id == MPLockHotKey.id) {
        [((__bridge MPMacAppDelegate *)userData) lock:nil];
        return noErr;
    }

    return eventNotHandledErr;
}

- (void)updateUsers {

    [[[self.usersItem submenu] itemArray] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        if (idx > 1)
            [[self.usersItem submenu] removeItem:obj];
    }];

    NSManagedObjectContext *context = [MPMacAppDelegate managedObjectContextForMainThreadIfReady];
    if (!context) {
        self.createUserItem.title = @"New User (Not ready)";
        self.createUserItem.enabled = NO;
        self.createUserItem.toolTip = @"Please wait until the app is fully loaded.";
        [self.usersItem.submenu addItemWithTitle:@"Loading..." action:NULL keyEquivalent:@""].enabled = NO;

        return;
    }

    self.createUserItem.title = @"New User";
    self.createUserItem.enabled = YES;
    self.createUserItem.toolTip = nil;

    NSError *error = nil;
    NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:NSStringFromClass( [MPUserEntity class] )];
    fetchRequest.sortDescriptors = @[ [NSSortDescriptor sortDescriptorWithKey:@"lastUsed" ascending:NO] ];
    NSArray *users = [context executeFetchRequest:fetchRequest error:&error];
    if (!users)
    err(@"Failed to load users: %@", error);

    if (![users count]) {
        NSMenuItem *noUsersItem = [self.usersItem.submenu addItemWithTitle:@"No users" action:NULL keyEquivalent:@""];
        noUsersItem.enabled = NO;
        noUsersItem.toolTip = @"Use the iOS app to create users and make sure iCloud is enabled in its preferences as well.  "
                @"Then give iCloud some time to sync the new user to your Mac.";
    }

    MPUserEntity *activeUser = [self activeUserInContext:context];
    for (MPUserEntity *user in users) {
        NSMenuItem *userItem = [[NSMenuItem alloc] initWithTitle:user.name action:@selector(selectUser:) keyEquivalent:@""];
        [userItem setTarget:self];
        [userItem setRepresentedObject:[user objectID]];
        [[self.usersItem submenu] addItem:userItem];

        if (!activeUser && [user.name isEqualToString:[MPMacConfig get].usedUserName])
            [self selectUser:userItem];
    }

    [self updateMenuItems];
}

- (void)selectUser:(NSMenuItem *)item {

    [self signOutAnimated:NO];

    NSError *error = nil;
    NSManagedObjectContext *context = [MPMacAppDelegate managedObjectContextForMainThreadIfReady];
    self.activeUser = (MPUserEntity *)[context existingObjectWithID:[item representedObject] error:&error];

    if (error)
    err(@"While looking up selected user: %@", error);
}

- (void)showMenu {

    [self updateMenuItems];

    [self.statusView popUpMenu];
}

- (IBAction)togglePreference:(id)sender {

    if (sender == self.enableCloudButton)
        [self storeManager].cloudEnabled = (self.enableCloudButton.state == NSOnState);
    if (sender == self.useCloudItem)
        [self storeManager].cloudEnabled = !(self.useCloudItem.state == NSOnState);
    if (sender == self.rememberPasswordItem)
        [MPConfig get].rememberLogin = [NSNumber numberWithBool:![[MPConfig get].rememberLogin boolValue]];
    if (sender == self.openAtLoginButton)
        [self setLoginItemEnabled:(self.openAtLoginButton.state == NSOnState)];
    if (sender == self.openAtLoginItem)
        [self setLoginItemEnabled:!(self.openAtLoginItem.state == NSOnState)];
    if (sender == self.savePasswordItem) {
        [MPMacAppDelegate managedObjectContextPerformBlockAndWait:^(NSManagedObjectContext *context) {
            MPUserEntity *activeUser = [[MPMacAppDelegate get] activeUserInContext:context];
            if ((activeUser.saveKey = !activeUser.saveKey))
                [[MPMacAppDelegate get] storeSavedKeyFor:activeUser];
            else
                [[MPMacAppDelegate get] forgetSavedKeyFor:activeUser];
            [context saveToStore];
        }];
    }
    if (sender == self.dialogStyleRegular)
        [MPMacConfig get].dialogStyleHUD = @NO;
    if (sender == self.dialogStyleHUD)
        [MPMacConfig get].dialogStyleHUD = @YES;
}

- (IBAction)newUser:(NSMenuItem *)sender {

    NSAlert *alert = [NSAlert alertWithMessageText:@"New User"
                                     defaultButton:@"Create User" alternateButton:nil otherButton:@"Cancel"
                         informativeTextWithFormat:@"To begin, enter your full name.\n\n"
                                 @"IMPORTANT: Enter your name correctly, including the right capitalization, "
                                 @"as you would on an official document."];
    NSTextField *nameField = [[NSTextField alloc] initWithFrame:NSMakeRect( 0, 0, 200, 22 )];
    [alert setAccessoryView:nameField];
    [alert layout];
    [nameField becomeFirstResponder];
    if ([alert runModal] != NSAlertDefaultReturn)
        return;

    NSString *name = [(NSSecureTextField *)alert.accessoryView stringValue];
    [MPMacAppDelegate managedObjectContextPerformBlock:^(NSManagedObjectContext *moc) {
        MPUserEntity *newUser = [NSEntityDescription insertNewObjectForEntityForName:NSStringFromClass( [MPUserEntity class] )
                                                              inManagedObjectContext:moc];
        newUser.name = name;
        [moc saveToStore];
        NSError *error = nil;
        if (![moc obtainPermanentIDsForObjects:@[ newUser ] error:&error])
        err(@"Failed to obtain permanent object ID for new user: %@", error);

        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            [self updateUsers];
            [self setActiveUser:newUser];
            [self showPasswordWindow:nil];
        }];
    }];
}

- (IBAction)lock:(id)sender {

    self.key = nil;
}

- (IBAction)rebuildCloud:(id)sender {

    if ([[NSAlert alertWithMessageText:@"iCloud Truth Sync" defaultButton:@"Continue"
                       alternateButton:nil otherButton:@"Cancel"
             informativeTextWithFormat:@"This action will force all your iCloud enabled devices to revert to this device's version of the truth."
                     @"\n\nThis is only necessary if you notice that your devices aren't syncing properly anymore.  "
                     "Any data on other devices not available from here will be lost."] runModal] == NSAlertDefaultReturn)
        [self.storeManager rebuildCloudContentFromCloudStoreOrLocalStore:NO];
}

- (IBAction)terminate:(id)sender {

    [self.passwordWindow close];
    self.passwordWindow = nil;

    [NSApp terminate:nil];
}

- (IBAction)iphoneAppStore:(id)sender {

    [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:@"http://itunes.apple.com/app/id510296984"]];

    [self.initialWindow close];
    self.initialWindow = nil;
}

- (void)didUpdateConfigForKey:(SEL)configKey fromValue:(id)oldValue {

    [[NSNotificationCenter defaultCenter]
            postNotificationName:MPCheckConfigNotification object:NSStringFromSelector( configKey ) userInfo:nil];
}

#pragma mark - NSApplicationDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

    // Setup delegates and listeners.
    [MPConfig get].delegate = self;
    __weak id weakSelf = self;
    [self addObserverBlock:^(NSString *keyPath, id object, NSDictionary *change, void *context) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [weakSelf updateMenuItems];
        });
    }           forKeyPath:@"key" options:0 context:nil];
    [self addObserverBlock:^(NSString *keyPath, id object, NSDictionary *change, void *context) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [weakSelf updateMenuItems];
        });
    }           forKeyPath:@"activeUser" options:0 context:nil];
    [self addObserverBlock:^(NSString *keyPath, id object, NSDictionary *change, void *context) {
        dispatch_async(dispatch_get_main_queue(), ^{
            [weakSelf updateMenuItems];
        });
    }           forKeyPath:@"storeManager.cloudAvailable" options:0 context:nil];

    // Status item.
    self.statusView = [[RHStatusItemView alloc] initWithStatusBarItem:
            [[NSStatusBar systemStatusBar] statusItemWithLength:NSSquareStatusItemLength]];
    self.statusView.image = [NSImage imageNamed:@"menu-icon"];
    self.statusView.menu = self.statusMenu;
    self.statusView.target = self;
    self.statusView.action = @selector(showMenu);

    [[NSNotificationCenter defaultCenter] addObserverForName:USMStoreDidChangeNotification object:nil
                                                       queue:[NSOperationQueue mainQueue] usingBlock:
            ^(NSNotification *note) {
                [self updateUsers];
            }];
    [[NSNotificationCenter defaultCenter] addObserverForName:USMStoreDidImportChangesNotification object:nil
                                                       queue:[NSOperationQueue mainQueue] usingBlock:
            ^(NSNotification *note) {
                [self updateUsers];
            }];
    [[NSNotificationCenter defaultCenter] addObserverForName:MPCheckConfigNotification object:nil
                                                       queue:[NSOperationQueue mainQueue] usingBlock:
            ^(NSNotification *note) {
                self.rememberPasswordItem.state = [[MPConfig get].rememberLogin boolValue]? NSOnState: NSOffState;
                self.savePasswordItem.state = [[MPMacAppDelegate get] activeUserForMainThread].saveKey? NSOnState: NSOffState;
                self.dialogStyleRegular.state = ![[MPMacConfig get].dialogStyleHUD boolValue]? NSOnState: NSOffState;
                self.dialogStyleHUD.state = [[MPMacConfig get].dialogStyleHUD boolValue]? NSOnState: NSOffState;

                if ([note.object isEqual:NSStringFromSelector( @selector(dialogStyleHUD) )]) {
                    if (![self.passwordWindow.window isVisible])
                        self.passwordWindow = nil;
                    else {
                        [self.passwordWindow close];
                        self.passwordWindow = nil;
                        [self showPasswordWindow:nil];
                    }
                }
            }];
    [self updateUsers];

    // Global hotkey.
    EventHotKeyRef hotKeyRef;
    EventTypeSpec hotKeyEvents[1] = { { .eventClass = kEventClassKeyboard, .eventKind = kEventHotKeyPressed } };
    OSStatus status = InstallApplicationEventHandler(NewEventHandlerUPP( MPHotKeyHander ), GetEventTypeCount( hotKeyEvents ),
    hotKeyEvents, (__bridge void *)self, NULL);
    if (status != noErr)
    err(@"Error installing application event handler: %i", (int)status);
    status = RegisterEventHotKey( 35 /* p */, controlKey + cmdKey, MPShowHotKey, GetApplicationEventTarget(), 0, &hotKeyRef );
    if (status != noErr)
    err(@"Error registering 'show' hotkey: %i", (int)status);
    status = RegisterEventHotKey( 35 /* p */, controlKey + optionKey + cmdKey, MPLockHotKey, GetApplicationEventTarget(), 0, &hotKeyRef );
    if (status != noErr)
    err(@"Error registering 'lock' hotkey: %i", (int)status);

    // Initial display.
    [NSApp activateIgnoringOtherApps:YES];
    if ([[MPMacConfig get].firstRun boolValue])
        [self.initialWindow = [[NSWindowController alloc] initWithWindowNibName:@"MPInitialWindow" owner:self] showWindow:self];
}

- (void)setActiveUser:(MPUserEntity *)activeUser {

    [super setActiveUser:activeUser];

    self.usersItem.state = NSMixedState;
    [[[self.usersItem submenu] itemArray] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
        if ([[obj representedObject] isEqual:[activeUser objectID]]) {
            [obj setState:NSOnState];
            self.usersItem.state = NSOffState;
        }
        else
            [obj setState:NSOffState];
    }];

    [MPMacConfig get].usedUserName = activeUser.name;
}

- (void)updateMenuItems {

    MPUserEntity *activeUser = [self activeUserForMainThread];
//    if (!(self.showItem.enabled = ![self.passwordWindow.window isVisible])) {
//        self.showItem.title = @"Show (Showing)";
//        self.showItem.toolTip = @"Master Password is already showing.";
//    }
//    else if (!(self.showItem.enabled = (activeUser != nil))) {
//        self.showItem.title = @"Show (No user)";
//        self.showItem.toolTip = @"First select the user to show passwords for.";
//    }
//    else {
//        self.showItem.title = @"Show";
//        self.showItem.toolTip = nil;
//    }

    if (self.key) {
        self.lockItem.title = @"Lock";
        self.lockItem.enabled = YES;
        self.lockItem.toolTip = nil;
    }
    else {
        self.lockItem.title = @"Lock (Locked)";
        self.lockItem.enabled = NO;
        self.lockItem.toolTip = @"Master Password is currently locked.";
    }

    BOOL loginItemEnabled = [self loginItemEnabled];
    self.openAtLoginItem.state = loginItemEnabled? NSOnState: NSOffState;
    self.openAtLoginButton.state = loginItemEnabled? NSOnState: NSOffState;
    self.rememberPasswordItem.state = [[MPConfig get].rememberLogin boolValue]? NSOnState: NSOffState;

    self.savePasswordItem.state = activeUser.saveKey? NSOnState: NSOffState;
    if (!activeUser) {
        self.savePasswordItem.title = @"Save Password (No user)";
        self.savePasswordItem.enabled = NO;
        self.savePasswordItem.toolTip = @"First select your user and unlock by showing the Master Password window.";
    }
    else if (!self.key) {
        self.savePasswordItem.title = @"Save Password (Locked)";
        self.savePasswordItem.enabled = NO;
        self.savePasswordItem.toolTip = @"First unlock by showing the Master Password window.";
    }
    else {
        self.savePasswordItem.title = @"Save Password";
        self.savePasswordItem.enabled = YES;
        self.savePasswordItem.toolTip = nil;
    }

    self.useCloudItem.state = self.storeManager.cloudEnabled? NSOnState: NSOffState;
    self.enableCloudButton.state = self.storeManager.cloudEnabled? NSOnState: NSOffState;
    self.useCloudItem.enabled = self.storeManager.cloudAvailable;
    if (self.storeManager.cloudAvailable) {
        self.useCloudItem.title = @"Use iCloud";
        self.useCloudItem.toolTip = nil;
    }
    else {
        self.useCloudItem.title = @"Use iCloud (Unavailable)";
        self.useCloudItem.toolTip = @"iCloud is not set up for your Mac user.";
    }
}

- (IBAction)showPasswordWindow:(id)sender {

    [NSApp activateIgnoringOtherApps:YES];

    // If no user, can't activate.
    if (![self activeUserForMainThread]) {
        [[NSAlert alertWithMessageText:@"No User Selected" defaultButton:[PearlStrings get].commonButtonOkay alternateButton:nil
                           otherButton:nil informativeTextWithFormat:
                        @"Begin by selecting or creating your user from the status menu (●●●|) next to the clock."]
                runModal];
        [self.statusView popUpMenu];
        return;
    }

    // Don't show window if we weren't already running (ie. if we haven't been activated before).
    if (!self.passwordWindow)
        self.passwordWindow = [[MPPasswordWindowController alloc] initWithWindowNibName:@"MPPasswordWindowController"];

    [self.passwordWindow showWindow:self];
}

- (void)setLoginItemEnabled:(BOOL)enabled {

    BOOL loginItemEnabled = [self loginItemEnabled];
    if (loginItemEnabled != enabled) {
        if (SMLoginItemSetEnabled( (__bridge CFStringRef)LOGIN_HELPER_BUNDLE_ID, (Boolean)enabled ) == true)
            loginItemEnabled = enabled;
        else
            wrn(@"Failed to set login item.");
    }

    self.openAtLoginItem.state = loginItemEnabled? NSOnState: NSOffState;
    self.openAtLoginButton.state = loginItemEnabled? NSOnState: NSOffState;
}

- (BOOL)loginItemEnabled {

    // The easy and sane method (SMJobCopyDictionary) can pose problems when the app is sandboxed. -_-
    NSArray *jobs = (__bridge_transfer NSArray *)SMCopyAllJobDictionaries( kSMDomainUserLaunchd );

    for (NSDictionary *job in jobs)
        if ([LOGIN_HELPER_BUNDLE_ID isEqualToString:[job objectForKey:@"Label"]]) {
            dbg(@"loginItemEnabled: %@", @([[job objectForKey:@"OnDemand"] boolValue]));
            return [[job objectForKey:@"OnDemand"] boolValue];
        }

    dbg(@"loginItemEnabled: not found");
    return NO;
}

- (void)applicationWillResignActive:(NSNotification *)notification {

    if (![[MPConfig get].rememberLogin boolValue])
        [self lock:nil];
}

- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender {
    // Save changes in the application's managed object context before the application terminates.

    NSManagedObjectContext *context = [MPMacAppDelegate managedObjectContextForMainThreadIfReady];
    if (!context)
        return NSTerminateNow;

    if (![context commitEditing])
        return NSTerminateCancel;

    if (![context hasChanges])
        return NSTerminateNow;

    [context saveToStore];
    return NSTerminateNow;
}

@end