yattee/Model/Stream.swift

import AVFoundation
import Defaults
import Foundation

// swiftlint:disable:next final_class
class Stream: Equatable, Hashable, Identifiable {
    enum Resolution: String, CaseIterable, Comparable, Defaults.Serializable {
        case hd2160p60
        case hd2160p50
        case hd2160p48
        case hd2160p30
        case hd1440p60
        case hd1440p50
        case hd1440p48
        case hd1440p30
        case hd1080p60
        case hd1080p50
        case hd1080p48
        case hd1080p30
        case hd720p60
        case hd720p50
        case hd720p48
        case hd720p30
        case sd480p30
        case sd360p30
        case sd240p30
        case sd144p30
        case unknown

        var name: String {
            "\(height)p\(refreshRate != -1 && refreshRate != 30 ? ", \(refreshRate) fps" : "")"
        }

        var height: Int {
            if self == .unknown {
                return -1
            }

            let resolutionPart = rawValue.components(separatedBy: "p").first!
            return Int(resolutionPart.components(separatedBy: CharacterSet.decimalDigits.inverted).joined())!
        }

        var refreshRate: Int {
            if self == .unknown {
                return -1
            }

            let refreshRatePart = rawValue.components(separatedBy: "p")[1]

            if refreshRatePart.isEmpty {
                return 30
            }

            return Int(refreshRatePart.components(separatedBy: CharacterSet.decimalDigits.inverted).joined()) ?? -1
        }

        // These values are an approximation.
        // https://support.google.com/youtube/answer/1722171?hl=en#zippy=%2Cbitrate

        var bitrate: Int {
            switch self {
            case .hd2160p60, .hd2160p50, .hd2160p48, .hd2160p30:
                return 56_000_000 // 56 Mbit/s
            case .hd1440p60, .hd1440p50, .hd1440p48, .hd1440p30:
                return 24_000_000 // 24 Mbit/s
            case .hd1080p60, .hd1080p50, .hd1080p48, .hd1080p30:
                return 12_000_000 // 12 Mbit/s
            case .hd720p60, .hd720p50, .hd720p48, .hd720p30:
                return 9_500_000 // 9.5 Mbit/s
            case .sd480p30:
                return 4_000_000 // 4 Mbit/s
            case .sd360p30:
                return 1_500_000 // 1.5 Mbit/s
            case .sd240p30:
                return 1_000_000 // 1 Mbit/s
            case .sd144p30:
                return 600_000 // 0.6 Mbit/s
            case .unknown:
                return 0
            }
        }

        static func from(resolution: String, fps: Int? = nil) -> Self {
            allCases.first { $0.rawValue.contains(resolution) && $0.refreshRate == (fps ?? 30) } ?? .unknown
        }

        static func < (lhs: Self, rhs: Self) -> Bool {
            lhs.height == rhs.height ? (lhs.refreshRate < rhs.refreshRate) : (lhs.height < rhs.height)
        }
    }

    enum Kind: String, Comparable {
        case hls, adaptive, stream

        private var sortOrder: Int {
            switch self {
            case .hls:
                return 0
            case .stream:
                return 1
            case .adaptive:
                return 2
            }
        }

        static func < (lhs: Self, rhs: Self) -> Bool {
            lhs.sortOrder < rhs.sortOrder
        }
    }

    enum Format: String {
        case avc1
        case mp4
        case av1
        case webm
        case hls
        case stream
        case unknown

        var description: String {
            switch self {
            case .webm:
                return "WebM"
            case .hls:
                return "adaptive (HLS)"
            case .stream:
                return "Stream"
            default:
                return rawValue.uppercased()
            }
        }

        static func from(_ string: String) -> Self {
            let lowercased = string.lowercased()

            if lowercased.contains("avc1") {
                return .avc1
            }
            if lowercased.contains("mpeg_4") || lowercased.contains("mp4") {
                return .mp4
            }
            if lowercased.contains("av01") {
                return .av1
            }
            if lowercased.contains("webm") {
                return .webm
            }
            if lowercased.contains("stream") {
                return .stream
            }
            if lowercased.contains("hls") {
                return .hls
            }
            return .unknown
        }
    }

    let id = UUID()

    var instance: Instance!
    var audioAsset: AVURLAsset!
    var videoAsset: AVURLAsset!
    var hlsURL: URL!
    var localURL: URL!

    var resolution: Resolution!
    var kind: Kind!
    var format: Format!

    var encoding: String?
    var videoFormat: String?
    var bitrate: Int?

    init(
        instance: Instance? = nil,
        audioAsset: AVURLAsset? = nil,
        videoAsset: AVURLAsset? = nil,
        hlsURL: URL? = nil,
        localURL: URL? = nil,
        resolution: Resolution? = nil,
        kind: Kind = .hls,
        encoding: String? = nil,
        videoFormat: String? = nil,
        bitrate: Int? = nil
    ) {
        self.instance = instance
        self.audioAsset = audioAsset
        self.videoAsset = videoAsset
        self.hlsURL = hlsURL
        self.localURL = localURL
        self.resolution = resolution
        self.kind = kind
        self.encoding = encoding
        format = .from(videoFormat ?? "")
        self.bitrate = bitrate
    }

    var isLocal: Bool {
        localURL != nil
    }

    var isHLS: Bool {
        hlsURL != nil
    }

    var quality: String {
        guard localURL.isNil else { return "Opened File" }

        if kind == .hls {
            return "adaptive (HLS)"
        }

        return resolution.name
    }

    var shortQuality: String {
        guard localURL.isNil else { return "File" }

        if kind == .hls {
            return "adaptive (HLS)"
        }

        if kind == .stream {
            return resolution.name
        }
        return resolutionAndFormat
    }

    var description: String {
        guard localURL.isNil else { return resolutionAndFormat }
        let instanceString = instance.isNil ? "" : " - (\(instance!.description))"
        return format != .hls ? "\(resolutionAndFormat)\(instanceString)" : "adaptive (HLS)\(instanceString)"
    }

    var resolutionAndFormat: String {
        let formatString = format == .unknown ? "" : " (\(format.description))"
        return "\(quality)\(formatString)"
    }

    var assets: [AVURLAsset] {
        [audioAsset, videoAsset]
    }

    var videoAssetContainsAudio: Bool {
        assets.dropFirst().allSatisfy { $0.url == assets.first!.url }
    }

    var singleAssetURL: URL? {
        guard localURL.isNil else {
            return URLBookmarkModel.shared.loadBookmark(localURL) ?? localURL
        }

        if kind == .hls {
            return hlsURL
        }
        if videoAssetContainsAudio {
            return videoAsset.url
        }

        return nil
    }

    static func == (lhs: Stream, rhs: Stream) -> Bool {
        lhs.id == rhs.id
    }

    func hash(into hasher: inout Hasher) {
        if let url = videoAsset?.url {
            hasher.combine(url)
        }
        if let url = audioAsset?.url {
            hasher.combine(url)
        }
        if let url = hlsURL {
            hasher.combine(url)
        }
    }
}