/*

    Copyright (C) 2017 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    A view controller that demonstrates how to present an `AVPlayerViewController` for an `AVPlayerItem` with metadata and timings.

*/

import UIKit

import AVKit

class VideoPlayerViewController: UIViewController, AVPlayerViewControllerDelegate {

    // MARK: IB Actions

    @IBAction func playVideo(_ sender: AnyObject) {

        // Create an AVAsset with for the media's URL.

        let mediaURL = URL(string: "http://p.events-delivery.apple.com.edgesuite.net/1509pijnedfvopihbefvpijlkjb/m3u8/hls_vod_mvp.m3u8")!

        let asset = AVAsset(url: mediaURL)

        /*

            Create an `AVPlayerItem` for the `AVAsset` and populate it with information

            about the video.

        */

        let playerItem = AVPlayerItem(asset: asset)

        playerItem.externalMetadata = sampleExternalMetaData()

        playerItem.navigationMarkerGroups = [sampleNavigationMarkerGroup()]

        playerItem.interstitialTimeRanges = sampleInterstitialTimeRanges()

        // Create and present an `AVPlayerViewController`.

        let playerViewController = AVPlayerViewController()

        playerViewController.delegate = self

        let player = AVPlayer(playerItem: playerItem)

        playerViewController.player = player

        self.present(playerViewController, animated: true) {

            /*

                Begin playing the media as soon as the controller has

                been presented.

            */

            player.play()

        }

    }

    // MARK: AVPlayerViewControllerDelegate

    func playerViewController(_ playerViewController: AVPlayerViewController, willPresent interstitial: AVInterstitialTimeRange) {

        // Prevent the user from skipping intersitials.

        playerViewController.requiresLinearPlayback = true

    }

    func playerViewController(_ playerViewController: AVPlayerViewController, didPresent interstitial: AVInterstitialTimeRange) {

        /*

            Allow the user to navigate anywhere in the video once an interstitial

            has been played.

        */

        playerViewController.requiresLinearPlayback = false

    }

    // MARK: Meta data

    func sampleExternalMetaData() -> [AVMetadataItem] {

        let titleItem = AVMutableMetadataItem()

        titleItem.identifier = AVMetadataCommonIdentifierTitle

        titleItem.value = "Apple Special Event, September 2015" as NSString

        titleItem.extendedLanguageTag = "und"

        let descriptionItem = AVMutableMetadataItem()

        descriptionItem.identifier = AVMetadataCommonIdentifierDescription

        descriptionItem.value = "Check out iPhone 6s and iPhone 6s Plus, learn about the powerful iPad Pro, take a look at the new features and bands for Apple Watch, and see the premiere of the all-new Apple TV." as NSString

        descriptionItem.extendedLanguageTag = "und"

        return [titleItem, descriptionItem]

    }

    func sampleNavigationMarkerGroup() -> AVNavigationMarkersGroup {

        let group = AVNavigationMarkersGroup(title: "Announcements", timedNavigationMarkers: [

            timedMetaDataGroupWithTitle("Apple Watch", startTime: 90, endTime: 917),

            timedMetaDataGroupWithTitle("iPad Pro", startTime: 917, endTime: 1691),

            timedMetaDataGroupWithTitle("Apple Pencil", startTime: 1691, endTime: 3105),

            timedMetaDataGroupWithTitle("Apple TV", startTime: 3105, endTime: 4968),

            timedMetaDataGroupWithTitle("iPhone", startTime: 4968, endTime: 7328)

        ])

        return group

    }

    func sampleInterstitialTimeRanges() -> [AVInterstitialTimeRange] {

        let ranges = [

            AVInterstitialTimeRange(timeRange: timeRange(withStartTime: 728, duration: 53)),

            AVInterstitialTimeRange(timeRange: timeRange(withStartTime: 1015, duration: 55)),

            AVInterstitialTimeRange(timeRange: timeRange(withStartTime: 3305, duration: 759)),

            AVInterstitialTimeRange(timeRange: timeRange(withStartTime: 7261, duration: 61))

        ]

        return ranges

    }

    // MARK: Convenience

    func timedMetaDataGroupWithTitle(_ title: String, startTime: TimeInterval, endTime: TimeInterval) -> AVTimedMetadataGroup {

        // Create an `AVMetadataItem` for the title.

        let titleItem = AVMutableMetadataItem()

        titleItem.identifier = AVMetadataCommonIdentifierTitle

        titleItem.value = title as NSString

        titleItem.extendedLanguageTag = "und"

        // Create a `CMTimeRange` from the supplied information.

        let range = timeRange(from: startTime, to: endTime)

        return AVTimedMetadataGroup(items: [titleItem], timeRange: range)

    }

    func timeRange(from startTime: TimeInterval, to endTime: TimeInterval) -> CMTimeRange {

        let cmStartTime = CMTimeMakeWithSeconds(Float64(startTime), 100)

        let cmEndTime = CMTimeMakeWithSeconds(Float64(endTime), 100)

        let timeRange = CMTimeRangeFromTimeToTime(cmStartTime, cmEndTime)

        return timeRange

    }

    func timeRange(withStartTime startTime: TimeInterval, duration: TimeInterval) -> CMTimeRange {

        let cmStartTime = CMTimeMakeWithSeconds(Float64(startTime), 100)

        let cmDuration = CMTimeMakeWithSeconds(Float64(duration), 100)

        let timeRange = CMTimeRange(start: cmStartTime, duration: cmDuration)

        return timeRange

    }

}