/*

    Copyright (C) 2015 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    The 'AAPLMovieViewController' and 'AAPLMovieViewControllerDelegate' provide a way for this ViewController and it's subviews to talk to a data source that understands how to manipulate the QuickTime File Format and edit movies.

 */

#import "AAPLMovieViewController.h"

#import "AAPLMovieTimeline.h"

@interface AAPLMovieViewController () <AAPLMovieTimelineUpdateDelgate, NSMenuDelegate>

@property (weak) IBOutlet AAPLMovieTimeline *movieTimeline;

@property CMTimeRange selectedTimeRange;

@property CMTime selectedPointInTime;

@end

@implementation AAPLMovieViewController

- (void)viewWillAppear {

    [super viewWillAppear];

    self.movieTimeline.delegate = self;

    [self updateMovieTimeline];

    [[NSNotificationCenter defaultCenter] addObserverForName:NSWindowDidEndLiveResizeNotification object:nil queue:nil usingBlock:^(NSNotification * __nonnull note) {

        [self updateMovieTimeline];

    }];

}

- (void)updateMovieTimeline {

    self.movieTimeline.needsLayout = YES;

    [self.movieTimeline removeAllPositionalSubviews];

    NSUInteger numberOfImagesNeeded = [self.movieTimeline countOfImagesRequiredToFillView];

    [self.delegate movieViewController:self needsNumberOfImages:numberOfImagesNeeded completionHandler:^(NSImage * image) {

        // Add image view on the main thread.

        dispatch_async(dispatch_get_main_queue(), ^{

            [self.movieTimeline addImageView:image];

        });

    }];

}

#pragma mark - MovieTimeLine Delegate

- (void)movieTimeline:(AAPLMovieTimeline *)timeline didUpdateCursorToPoint:(NSPoint)toPoint {

    CGFloat percentage = toPoint.x / self.movieTimeline.frame.size.width;

    CMTime time = [self.delegate timeAtPercentage:percentage];

    // Update the time label for the new cursor point.

    float seconds = CMTimeGetSeconds(time) <= 0 ? 0 : CMTimeGetSeconds(time);

    NSString *timeDescription = [NSString stringWithFormat:@"%.2f", seconds];

    [self.movieTimeline updateTimeLabel:timeDescription];

}

- (void)didSelectTimelineRangeFromPoint:(NSPoint)fromPoint toPoint:(NSPoint)toPoint {

    CGFloat startPercentage = fromPoint.x / self.movieTimeline.frame.size.width;

    CGFloat endPercentage = toPoint.x / self.movieTimeline.frame.size.width;

    CMTime startTime = [self.delegate timeAtPercentage:startPercentage];

    CMTime endTime = [self.delegate timeAtPercentage:endPercentage];

    // Calculate the duration from the the time percentages.

    CMTime duration = CMTimeSubtract(endTime, startTime);

    self.selectedTimeRange = CMTimeRangeMake(startTime, duration);

}

- (void)didSelectTimelinePoint:(NSPoint)point {

    CGFloat pointPercentage = point.x / self.movieTimeline.frame.size.width;

    self.selectedPointInTime = [self.delegate timeAtPercentage:pointPercentage];

    self.selectedTimeRange = CMTimeRangeMake(kCMTimeZero, kCMTimeZero);

}

#pragma mark - Right click NSMEnu to message Cut, Copy, and Paste

- (void)rightMouseDown:(nonnull NSEvent *)theEvent {

    NSMenu *menu = [[NSMenu alloc] initWithTitle:@"Movie Style Editing"];

    // If we have not selected a time range then we can not copy or cut - only paste.

    if (CMTIME_COMPARE_INLINE(self.selectedTimeRange.start, ==, kCMTimeZero) && CMTIME_COMPARE_INLINE(self.selectedTimeRange.duration, ==, kCMTimeZero)) {

        [menu insertItemWithTitle:@"Paste" action:@selector(pasteMovie) keyEquivalent:@"" atIndex:0];

    } else {

        [menu insertItemWithTitle:@"Cut" action:@selector(cutMovie) keyEquivalent:@"" atIndex:0];

        [menu insertItemWithTitle:@"Copy" action:@selector(copyMovie) keyEquivalent:@"" atIndex:1];

    }

    menu.delegate = self;

    [NSMenu popUpContextMenu:menu withEvent:theEvent forView:self.view];

}

- (void)cutMovie {

    // Cut the movie and handle the error if necessary.

    NSError *error = nil;

    BOOL didSucceed = [self.delegate cutMovieTimeRange:self.selectedTimeRange error:error];

    if (!didSucceed || error) {

        NSLog(@"There was an error performing the cut operation");

    }

}

- (void)copyMovie {

    // Cut the movie and handle the error if necessary.

    NSError *error = nil;

    BOOL didSucceed = [self.delegate copyMovieTimeRange:self.selectedTimeRange error:error];

    if (!didSucceed || error) {

        NSLog(@"There was an error performing the copy operation.");

    }

}

- (void)pasteMovie {

    // Paste the movie and handle the error if necessary.

    NSError *error = nil;

    BOOL didSucceed = [self.delegate pasteMovieAtTime:self.selectedPointInTime error:error];

    if (!didSucceed || error) {

        NSLog(@"There was an error performing the paste operation.");

    }

}

#pragma mark - Edit Menu Cut, Copy, Paste methods

- (void)cut:(id)sender {

    [self cutMovie];

}

- (void)copy:(id)sender {

    [self copyMovie];

}

- (void)paste:(id)sender {

    [self pasteMovie];

}

@end