/*

     File: APLAppDelegate.m

 Abstract:  The app delegate which handles setup, playback and export of AVMutableComposition along with other user interactions like scrubbing, toggling play/pause, selecting transition type. 

  Version: 1.1

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#import "APLAppDelegate.h"

#import "APLSimpleEditor.h"

#import <AVFoundation/AVFoundation.h>

#define kDiagonalWipeTransition 0

#define kCrossDissolveTransition 1

@interface APLAppDelegate ()

{   

    float       _transitionDuration;

    NSInteger   _transitionType;

}

@property APLSimpleEditor *editor;

@property NSMutableArray *clips;

@property NSMutableArray *clipTimeRanges;

@property AVPlayer *player;

@property AVPlayerItem *playerItem;

@end

@implementation APLAppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification

{

    _editor = [[APLSimpleEditor alloc] init];

    _clips = [[NSMutableArray alloc] initWithCapacity:2];

    _clipTimeRanges = [[NSMutableArray alloc] initWithCapacity:2];

    // Default cross fade duration is set to 2.0 seconds

    _transitionDuration = 2.0;

    _transitionType = kDiagonalWipeTransition; // Default transition type is set Diagonal Wipe

    // Add clips to pass to the editor

    [self addClipsToEditor];

    // Initialize an AVPlayer and set it as the player on the AVPlayerView

    if (!self.player) {

        self.player = [[AVPlayer alloc] init];

        self.playerView.player = self.player;

    }

    // Synchronize the player with editor

    [self synchronizePlayerWithEditor];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(windowWillClose:) name:NSWindowWillCloseNotification object:self.window];

    NSMenu *transitionMenu = [[NSMenu alloc] initWithTitle:@"Transitions Menu"];

    [transitionMenu insertItemWithTitle:@"Diagonal Wipe" action:@selector(respondToTransitionSelection:) keyEquivalent:@"" atIndex:kDiagonalWipeTransition];

    [transitionMenu insertItemWithTitle:@"Cross Dissolve" action:@selector(respondToTransitionSelection:) keyEquivalent:@"" atIndex:kCrossDissolveTransition];

    [(NSMenuItem *)transitionMenu.itemArray[kDiagonalWipeTransition] setState:NSOnState];

    self.playerView.actionPopUpButtonMenu = transitionMenu;

}

- (void)addClipsToEditor

{

    // The two assets in the projects bundle are used

    AVURLAsset *asset1 = [AVURLAsset assetWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"sample_clip1" ofType:@"m4v"]]];

    AVURLAsset *asset2 = [AVURLAsset assetWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"sample_clip2" ofType:@"mov"]]];

    // Set the timeRanges to 5 seconds each. Note: that we set our default transitionDuration to 2.0 seconds.

    [self.clips addObject:asset1];

    [self.clipTimeRanges addObject:[NSValue valueWithCMTimeRange:CMTimeRangeMake(CMTimeMakeWithSeconds(0, 1), CMTimeMakeWithSeconds(5, 1))]];

    [self.clips addObject:asset2];

    [self.clipTimeRanges addObject:[NSValue valueWithCMTimeRange:CMTimeRangeMake(CMTimeMakeWithSeconds(0, 1), CMTimeMakeWithSeconds(5, 1))]];

    // Synchronize these clips with the editor object.

    [self synchronizeWithEditor];

}

- (void)synchronizePlayerWithEditor

{

    AVPlayerItem *playerItem = nil;

    if ( self.player == nil )

        return;

    playerItem = [self.editor getPlayerItem];

    // Replace the currentItem with our playerItem on the player

    if (self.playerItem != playerItem) {

        self.playerItem = playerItem;

        [self.player replaceCurrentItemWithPlayerItem:playerItem];

    }

}

- (void)synchronizeWithEditor

{

    // Clips

    [self synchronizeEditorClipsWithOurClips];

    [self synchronizeEditorClipTimeRangesWithOurClipTimeRanges];

    // Transition

    self.editor.transitionDuration = CMTimeMakeWithSeconds(_transitionDuration, 600);

    self.editor.transitionType = _transitionType;

    [self.editor buildCompositionObjectsForPlayback];

    [self synchronizePlayerWithEditor];

}

- (void)synchronizeEditorClipsWithOurClips

{

    NSMutableArray *validClips = [NSMutableArray arrayWithCapacity:3];

    for (AVURLAsset *asset in self.clips) {

        if (![asset isKindOfClass:[NSNull class]]) {

            [validClips addObject:asset];

        }

    }

    self.editor.clips = validClips;

}

- (void)synchronizeEditorClipTimeRangesWithOurClipTimeRanges

{

    NSMutableArray *validClipTimeRanges = [NSMutableArray arrayWithCapacity:3];

    for (NSValue *timeRange in self.clipTimeRanges) {

        if (! [timeRange isKindOfClass:[NSNull class]]) {

            [validClipTimeRanges addObject:timeRange];

        }

    }

    self.editor.clipTimeRanges = validClipTimeRanges;

}

- (void)windowWillClose:(NSNotification*)notification

{

    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSWindowWillCloseNotification object:self.window];

    self.window = nil;

    self.player = nil;

    self.editor = nil;

    self.playerView = nil;

}

- (void)respondToTransitionSelection:(NSMenuItem *)item

{

    for (NSMenuItem *menuItem in [self.playerView.actionPopUpButtonMenu itemArray]) {

        if (menuItem == item) {

            menuItem.state = NSOnState;

        } else {

            menuItem.state = NSOffState;

        }

    }

    // Index 0 is Diagonal Wipe

    // Index 1 is Cross Dissolve

    _transitionType = [self.playerView.actionPopUpButtonMenu indexOfItem:item];

    [self synchronizeWithEditor];

}

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)theApplication

{

    return YES;

}

@end