//
//  NYTAppDelegate.m
//  Notifications for YouTube
//
//  Created by Kim Wittenburg on 09.07.13.
//  Copyright (c) 2013 Kim Wittenburg. All rights reserved.
//

#import "NYTAppDelegate.h"

// Core Imports
#import "NYTAuthentication.h"
#import "NYTUpdateManager.h"

// Other Imports
#import "NumberValueTransformer.h"
#import "NYTRulesWindowController.h"

@interface NYTAppDelegate ()

// Outlets etc.
@property (weak) IBOutlet NSButton *loginButton;
@property (readwrite, strong) NSStatusItem *statusItem;

// Login
@property (readwrite) BOOL loggingIn;

@end

// Notifications used for KVO
static void* const NYTLoginChangedNotification = @"NYTLoginChangedNotification";
static void* const NYTUpdateManagerPropertyDidChangeNotification = @"NYTUpdateManagerPropertyDidChangeNotification";

@implementation NYTAppDelegate {
    NYTRulesWindowController *_rulesController;
}

+ (void)initialize
{
    [super initialize];
    // Register our value transformers
    [NSValueTransformer setValueTransformer:[NumberValueTransformer new] forName:@"NumberValueTransformer"];
}

- (void)dealloc
{
    // Make sure this object gets removed from any observed object
    NYTUpdateManager *manager = [NYTUpdateManager sharedManager];
    [manager removeObserver:self forKeyPath:@"autoRefreshEnabled"];
    [manager removeObserver:self forKeyPath:@"autoRefreshInterval"];
    [manager removeObserver:self forKeyPath:@"coalescesNotifications"];
    [manager removeObserver:self forKeyPath:@"maximumVideoAge"];
    [[NYTAuthentication sharedAuthentication] removeObserver:self forKeyPath:@"isLoggedIn"];
}

#pragma mark - Application Delegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    NYTUpdateManager *manager = [NYTUpdateManager sharedManager];
    NYTAuthentication *auth = [NYTAuthentication sharedAuthentication];
    
    // Configure the User Defaults
    NSDictionary *userDefaults = @{@"autoRefreshEnabled": @YES, @"autoRefreshInterval": @600, @"coalescesNotifications": @YES, @"maximumVideoAge": @3600};
    [defaults registerDefaults:userDefaults];

    // Configure Notification Centers
    [NSUserNotificationCenter defaultUserNotificationCenter].delegate = self;
    // Notification Startup
    NSUserNotification *startNotification = aNotification.userInfo[NSApplicationLaunchUserNotificationKey];
    if (startNotification) {
        [self userNotificationCenter:[NSUserNotificationCenter defaultUserNotificationCenter] didActivateNotification:startNotification];
    }

    // Configure the status item
    self.statusItemVisible = YES;

    // Configure the login (and log in). Do so before configuring notifications or auto refresh because this can take a while
    [auth addObserver:self forKeyPath:@"isLoggedIn" options:0 context:NYTLoginChangedNotification];
    self.loggingIn = YES;
    [auth tryLoginFromKeychainWithCompletionHandler:^{
        self.loggingIn = NO;
        // If there is no login in the keychain show the preferences
        if (!auth.isLoggedIn) {
            [[NSApplication sharedApplication] activateIgnoringOtherApps:YES];
            [self.window makeKeyAndOrderFront:self];
        }
    }];

    // Configure the update manager
    manager.maximumVideoAge = [defaults integerForKey:@"maximumVideoAge"];
    manager.coalescesNotifications = [defaults boolForKey:@"coalescesNotifications"];
    manager.autoRefreshInterval = [defaults integerForKey:@"autoRefreshInterval"];
    [manager addObserver:self forKeyPath:@"maximumVideoAge" options:NSKeyValueObservingOptionNew context:NYTUpdateManagerPropertyDidChangeNotification];
    [manager addObserver:self forKeyPath:@"coalescesNotifications" options:NSKeyValueObservingOptionNew context:NYTUpdateManagerPropertyDidChangeNotification];
    [manager addObserver:self forKeyPath:@"autoRefreshInterval" options:NSKeyValueObservingOptionNew context:NYTUpdateManagerPropertyDidChangeNotification];

    // Configure (Auto) Refresh
    manager.autoRefreshEnabled = [defaults boolForKey:@"autoRefreshEnabled"];
    [manager addObserver:self forKeyPath:@"autoRefreshEnabled" options:NSKeyValueObservingOptionNew context:NYTUpdateManagerPropertyDidChangeNotification];
}

- (BOOL)applicationShouldHandleReopen:(NSApplication *)sender hasVisibleWindows:(BOOL)flag
{
    // Open the preferences on reopen (if no other window is visible)
    if (!flag) {
        [self.window makeKeyAndOrderFront:nil];
    }
    return YES;
}

- (void)applicationWillTerminate:(NSNotification *)notification
{
    [[NSUserDefaults standardUserDefaults] synchronize];
}

#pragma mark - User Notification Center Delegate

- (void)userNotificationCenter:(NSUserNotificationCenter *)center didActivateNotification:(NSUserNotification *)notification
{
    // Show the URL
    NSString *videoURL = notification.userInfo[NYTUserNotificationURLKey];
    [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:videoURL]];
    // Remove the notification
    [center removeDeliveredNotification:notification];
}

- (BOOL)userNotificationCenter:(NSUserNotificationCenter *)center shouldPresentNotification:(NSUserNotification *)notification
{
    return YES;
}

#pragma mark -
#pragma mark *** Handling the Status Item ***

- (void)setStatusItemVisible:(BOOL)visible
{
    if (visible) {
        self.statusItem = [[NSStatusBar systemStatusBar] statusItemWithLength:NSVariableStatusItemLength];
        //NSMutableAttributedString *title = [[NSMutableAttributedString alloc] initWithString:@"(4)"];
        //[title addAttribute:NSStrokeWidthAttributeName value:@-5.0 range:NSMakeRange/*(3, 4)*/(1, 1)];
        //self.statusItem.attributedTitle = title;
        self.statusItem.image = [NSImage imageNamed:@"play-icon-bw"];
        self.statusItem.alternateImage = [NSImage imageNamed:@"play-icon-s"];
        self.statusItem.menu = self.statusMenu;
        self.statusItem.highlightMode = YES;
    } else {
        [[NSStatusBar systemStatusBar] removeStatusItem:self.statusItem];
        self.statusItem = nil;
    }
}

- (BOOL)isStatusItemVisible
{
    return self.statusItem != nil;
}

#pragma mark *** Handling Login ***

- (IBAction)login:(id)sender {
    if ([NYTAuthentication sharedAuthentication].isLoggedIn) {
        // Logout: Present a sheet giving the following options: Logout, Cancel, Switch user
        NSString *title = NSLocalizedString(@"Do you want to log out or switch to another user?", nil);
        NSString *switchUser = NSLocalizedString(@"Switch User…", nil);
        NSString *logout = NSLocalizedString(@"Logout", nil);
        NSString *cancel = NSLocalizedString(@"Cancel", nil);
        NSString *msg = NSLocalizedString(@"If you logout the login stored in your keychain will be removed. You would have to log in agin the next time you want to use Notifications for YouTube.", nil);
        NSBeginAlertSheet(title, switchUser, logout, cancel, self.window, self, NULL, @selector(sheetDidDismiss:returnCode:contextInfo:), NULL, @"%@", msg);
    } else {
        [self doLogin];
    }
}

- (void)sheetDidDismiss:(NSWindow *)sheet returnCode:(int)returnCode contextInfo:(void  *)contextInfo
{
    if (returnCode == NSAlertDefaultReturn) {
        // Switch User
        [self doLogin];
    } else if (returnCode == NSAlertAlternateReturn) {
        // Logout: Redirect to Update Manager
        [[NYTAuthentication sharedAuthentication] discardLogin];
    }
}

- (void)doLogin
{
    // Login: Redirect to Update Manager
    self.loggingIn = YES;
    [[NYTAuthentication sharedAuthentication] beginLoginSheetForWindow:self.window completionHandler:^(NSError *error) {
        if (error) {
            // Show the error as sheet if possible
            if (self.window.isVisible) {
                [NSApp presentError:error modalForWindow:self.window delegate:nil didPresentSelector:NULL contextInfo:NULL];
            } else {
                [NSApp presentError:error];
            }
        }
        self.loggingIn = NO;
    }];
}

#pragma mark *** Handling Refreshing ***

- (IBAction)performRefresh:(id)sender {
    // Refresh with notifications
    [[NYTUpdateManager sharedManager] refreshFeedsWithErrorHandler:^(NSError *error) {
        // Show the error if the refresh was triggered manually
        // Possibly show it in a modal sheet otherwise a modal window
        if (error) {
            if ([sender respondsToSelector:@selector(window)] && [sender window].isVisible) {
                NSAlert *alert = [NSAlert alertWithError:error];
                [alert beginSheetModalForWindow:[sender window] modalDelegate:nil didEndSelector:NULL contextInfo:NULL];
            } else {
                [NSApp presentError:error];
            }
        }
    } notify:YES];
}

#pragma mark *** Configure Notifications ***

- (IBAction)editRules:(id)sender {
    _rulesController = [[NYTRulesWindowController alloc] init];
    [NSApp beginSheet:_rulesController.window modalForWindow:self.window modalDelegate:self didEndSelector:@selector(sheetDidEnd:returnCode:contextInfo:) contextInfo:NULL];
}

- (void)sheetDidEnd:(NSWindow *)sheet returnCode:(NSInteger)returnCode contextInfo:(void *)contextInfo
{
    // For efficiency reasons
    _rulesController = nil;
}

#pragma mark *** Other Actions ***

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if (context == NYTUpdateManagerPropertyDidChangeNotification) {
        id value = change[NSKeyValueChangeNewKey];
        [[NSUserDefaults standardUserDefaults] setObject:value forKey:keyPath];
    }else if (context == NYTLoginChangedNotification) {
        // Manage the title of the login/logout button based on wether login information is present (using KVO)
        if ([NYTAuthentication sharedAuthentication].isLoggedIn) {
            self.loginButton.title = NSLocalizedString(@"Logout…", nil);
        } else {
            self.loginButton.title = NSLocalizedString(@"Login…", nil);
        }
    } else {
        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
    }
}

- (IBAction)showPreferenceWindow:(id)sender
{
    // Activate the app first
    [[NSApplication sharedApplication] activateIgnoringOtherApps:YES];
    [self.window makeKeyAndOrderFront:sender];
    [self.window makeMainWindow];
}

- (IBAction)showAboutPanel:(id)sender {
    [NSApp activateIgnoringOtherApps:YES];
    [NSApp orderFrontStandardAboutPanel:sender];
}

- (IBAction)browseYouTube:(id)sender {
    [[NSWorkspace sharedWorkspace] openURL:[NSURL URLWithString:@"http://www.youtube.com/"]];
}

@end