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/*
 * This file is part of mpv.
 *
 * mpv is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * mpv is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
 */

import Cocoa

extension MenuBar {
    class MenuItem: NSMenuItem {
        var config: Config?
    }

    enum `Type`: Comparable {
        case menu
        case menuServices
        case separator
        case item
        case itemNormalSize
        case itemHalfSize
        case itemDoubleSize
        case itemMinimize
        case itemZoom
    }

    struct Config {
        let name: String
        let key: String
        let modifiers: NSEvent.ModifierFlags
        let type: Type
        let action: Selector?
        let target: AnyObject?
        let command: String
        let url: String
        var configs: [Config]

        init(
            name: String = "",
            key: String = "",
            modifiers: NSEvent.ModifierFlags = .command,
            type: Type = .item,
            action: Selector? = nil,
            target: AnyObject? = nil,
            command: String = "",
            url: String = "",
            configs: [Config] = []
        ) {
            self.name = name
            self.key = key
            self.modifiers = modifiers
            self.type = configs.isEmpty ? type : .menu
            self.action = action
            self.target = target
            self.command = command
            self.url = url
            self.configs = configs
        }
    }
}

class MenuBar: NSObject {
    unowned let appHub: AppHub
    let mainMenu = NSMenu(title: "Main")
    let servicesMenu = NSMenu(title: "Services")
    var menuConfigs: [Config] = []
    var dynamicMenuItems: [Type:[MenuItem]] = [:]
    let appIcon: NSImage

    @objc init(_ appHub: AppHub) {
        self.appHub = appHub
        UserDefaults.standard.set(false, forKey: "NSFullScreenMenuItemEverywhere")
        UserDefaults.standard.set(true, forKey: "NSDisabledDictationMenuItem")
        UserDefaults.standard.set(true, forKey: "NSDisabledCharacterPaletteMenuItem")
        NSWindow.allowsAutomaticWindowTabbing = false
        appIcon = appHub.getIcon()

        super.init()

        let appMenuConfigs = [
            Config(name: "About mpv", action: #selector(about), target: self),
            Config(type: .separator),
            Config(
                name: "Settings…",
                key: ",",
                action: #selector(settings(_:)),
                target: self,
                url: "mpv.conf"
            ),
            Config(
                name: "Keyboard Shortcuts Config…",
                action: #selector(settings(_:)),
                target: self,
                url: "input.conf"
            ),
            Config(type: .separator),
            Config(name: "Services", type: .menuServices),
            Config(type: .separator),
            Config(name: "Hide mpv", key: "h", action: #selector(NSApp.hide(_:))),
            Config(name: "Hide Others", key: "h", modifiers: [.command, .option], action: #selector(NSApp.hideOtherApplications(_:))),
            Config(name: "Show All", action: #selector(NSApp.unhideAllApplications(_:))),
            Config(type: .separator),
            Config(name: "Quit and Remember Position", action: #selector(command(_:)), target: self, command: "quit-watch-later"),
            Config(name: "Quit mpv", key: "q", action: #selector(command(_:)), target: self, command: "quit"),
        ]

        let fileMenuConfigs = [
            Config(name: "Open File…", key: "o", action: #selector(openFiles), target: self),
            Config(name: "Open URL…", key: "O", action: #selector(openUrl), target: self),
            Config(name: "Open Playlist…", action: #selector(openPlaylist), target: self),
            Config(type: .separator),
            Config(name: "Close", key: "w", action: #selector(NSWindow.performClose(_:))),
            Config(name: "Save Screenshot", action: #selector(command(_:)), target: self, command: "async screenshot"),
        ]

        let editMenuConfigs = [
            Config(name: "Undo", key: "z", action: Selector(("undo:"))),
            Config(name: "Redo", key: "Z", action: Selector(("redo:"))),
            Config(type: .separator),
            Config(name: "Cut", key: "x", action: #selector(NSText.cut(_:))),
            Config(name: "Copy", key: "c", action: #selector(NSText.copy(_:))),
            Config(name: "Paste", key: "v", action: #selector(NSText.paste(_:))),
            Config(name: "Select All", key: "a", action: #selector(NSResponder.selectAll(_:))),
        ]

        var viewMenuConfigs = [
            Config(name: "Toggle Fullscreen", action: #selector(command(_:)), target: self, command: "cycle fullscreen"),
            Config(name: "Toggle Float on Top", action: #selector(command(_:)), target: self, command: "cycle ontop"),
            Config(
                name: "Toggle Visibility on All Workspaces",
                action: #selector(command(_:)),
                target: self,
                command: "cycle on-all-workspaces"
            ),
        ]
#if HAVE_MACOS_TOUCHBAR
        viewMenuConfigs += [
            Config(type: .separator),
            Config(name: "Customize Touch Bar…", action: #selector(NSApp.toggleTouchBarCustomizationPalette(_:))),
        ]
#endif

        let videoMenuConfigs = [
            Config(name: "Zoom Out", action: #selector(command(_:)), target: self, command: "add panscan -0.1"),
            Config(name: "Zoom In", action: #selector(command(_:)), target: self, command: "add panscan 0.1"),
            Config(name: "Reset Zoom", action: #selector(command(_:)), target: self, command: "set panscan 0"),
            Config(type: .separator),
            Config(name: "Aspect Ratio 4:3", action: #selector(command(_:)), target: self, command: "set video-aspect-override \"4:3\""),
            Config(name: "Aspect Ratio 16:9", action: #selector(command(_:)), target: self, command: "set video-aspect-override \"16:9\""),
            Config(name: "Aspect Ratio 1.85:1", action: #selector(command(_:)), target: self, command: "set video-aspect-override \"1.85:1\""),
            Config(name: "Aspect Ratio 2.35:1", action: #selector(command(_:)), target: self, command: "set video-aspect-override \"2.35:1\""),
            Config(name: "Reset Aspect Ratio", action: #selector(command(_:)), target: self, command: "set video-aspect-override \"-1\""),
            Config(type: .separator),
            Config(name: "Rotate Left", action: #selector(command(_:)), target: self, command: "cycle-values video-rotate 0 270 180 90"),
            Config(name: "Rotate Right", action: #selector(command(_:)), target: self, command: "cycle-values video-rotate 90 180 270 0"),
            Config(name: "Reset Rotation", action: #selector(command(_:)), target: self, command: "set video-rotate 0"),
            Config(type: .separator),
            Config(name: "Half Size", key: "0", type: .itemHalfSize),
            Config(name: "Normal Size", key: "1", type: .itemNormalSize),
            Config(name: "Double Size", key: "2", type: .itemDoubleSize),
        ]

        let audioMenuConfigs = [
            Config(name: "Next Audio Track", action: #selector(command(_:)), target: self, command: "cycle audio"),
            Config(name: "Previous Audio Track", action: #selector(command(_:)), target: self, command: "cycle audio down"),
            Config(type: .separator),
            Config(name: "Toggle Mute", action: #selector(command(_:)), target: self, command: "cycle mute"),
            Config(type: .separator),
            Config(name: "Play Audio Later", action: #selector(command(_:)), target: self, command: "add audio-delay 0.1"),
            Config(name: "Play Audio Earlier", action: #selector(command(_:)), target: self, command: "add audio-delay -0.1"),
            Config(name: "Reset Audio Delay", action: #selector(command(_:)), target: self, command: "set audio-delay 0.0"),
        ]

        let subtitleMenuConfigs = [
            Config(name: "Next Subtitle Track", action: #selector(command(_:)), target: self, command: "cycle sub"),
            Config(name: "Previous Subtitle Track", action: #selector(command(_:)), target: self, command: "cycle sub down"),
            Config(type: .separator),
            Config(name: "Toggle Force Style", action: #selector(command(_:)), target: self, command: "cycle-values sub-ass-override \"force\" \"no\""),
            Config(type: .separator),
            Config(name: "Display Subtitles Later", action: #selector(command(_:)), target: self, command: "add sub-delay 0.1"),
            Config(name: "Display Subtitles Earlier", action: #selector(command(_:)), target: self, command: "add sub-delay -0.1"),
            Config(name: "Reset Subtitle Delay", action: #selector(command(_:)), target: self, command: "set sub-delay 0.0"),
        ]

        let playbackMenuConfigs = [
            Config(name: "Toggle Pause", action: #selector(command(_:)), target: self, command: "cycle pause"),
            Config(name: "Increase Speed", action: #selector(command(_:)), target: self, command: "add speed 0.1"),
            Config(name: "Decrease Speed", action: #selector(command(_:)), target: self, command: "add speed -0.1"),
            Config(name: "Reset Speed", action: #selector(command(_:)), target: self, command: "set speed 1.0"),
            Config(type: .separator),
            Config(name: "Show Playlist", action: #selector(command(_:)), target: self, command: "script-message osc-playlist"),
            Config(name: "Show Chapters", action: #selector(command(_:)), target: self, command: "script-message osc-chapterlist"),
            Config(name: "Show Tracks", action: #selector(command(_:)), target: self, command: "script-message osc-tracklist"),
            Config(type: .separator),
            Config(name: "Next File", action: #selector(command(_:)), target: self, command: "playlist-next"),
            Config(name: "Previous File", action: #selector(command(_:)), target: self, command: "playlist-prev"),
            Config(name: "Toggle Loop File", action: #selector(command(_:)), target: self, command: "cycle-values loop-file \"inf\" \"no\""),
            Config(name: "Toggle Loop Playlist", action: #selector(command(_:)), target: self, command: "cycle-values loop-playlist \"inf\" \"no\""),
            Config(name: "Shuffle", action: #selector(command(_:)), target: self, command: "playlist-shuffle"),
            Config(type: .separator),
            Config(name: "Next Chapter", action: #selector(command(_:)), target: self, command: "add chapter 1"),
            Config(name: "Previous Chapter", action: #selector(command(_:)), target: self, command: "add chapter -1"),
            Config(type: .separator),
            Config(name: "Step Forward", action: #selector(command(_:)), target: self, command: "frame-step"),
            Config(name: "Step Backward", action: #selector(command(_:)), target: self, command: "frame-back-step"),
        ]

        let windowMenuConfigs = [
            Config(name: "Minimize", key: "m", type: .itemMinimize),
            Config(name: "Zoom", type: .itemZoom),
        ]

        var helpMenuConfigs = [
            Config(name: "mpv Website…", action: #selector(url(_:)), target: self, url: "https://mpv.io"),
            Config(name: "mpv on GitHub…", action: #selector(url(_:)), target: self, url: "https://github.com/mpv-player/mpv"),
            Config(type: .separator),
            Config(name: "Online Manual…", action: #selector(url(_:)), target: self, url: "https://mpv.io/manual/master/"),
            Config(name: "Online Wiki…", action: #selector(url(_:)), target: self, url: "https://github.com/mpv-player/mpv/wiki"),
            Config(name: "Release Notes…", action: #selector(url(_:)), target: self, url: "https://github.com/mpv-player/mpv/blob/master/RELEASE_NOTES"),
            Config(name: "Keyboard Shortcuts…", action: #selector(url(_:)), target: self, url: "https://github.com/mpv-player/mpv/blob/master/etc/input.conf"),
            Config(type: .separator),
            Config(name: "Report Issue…", action: #selector(url(_:)), target: self, url: "https://github.com/mpv-player/mpv/issues/new/choose"),
        ]
        if ProcessInfo.processInfo.environment["MPVBUNDLE"] == "true" {
            helpMenuConfigs += [
                Config(name: "Show log File…", action: #selector(showFile(_:)), target: self, url: NSHomeDirectory() + "/Library/Logs/mpv.log")
            ]
        }

        menuConfigs = [
            Config(name: "Apple", configs: appMenuConfigs),
            Config(name: "File", configs: fileMenuConfigs),
            Config(name: "Edit", configs: editMenuConfigs),
            Config(name: "View", configs: viewMenuConfigs),
            Config(name: "Video", configs: videoMenuConfigs),
            Config(name: "Audio", configs: audioMenuConfigs),
            Config(name: "Subtitle", configs: subtitleMenuConfigs),
            Config(name: "Playback", configs: playbackMenuConfigs),
            Config(name: "Window", configs: windowMenuConfigs),
            Config(name: "Help", configs: helpMenuConfigs),
        ]

        createMenu(parentMenu: mainMenu, configs: menuConfigs)
        NSApp.mainMenu = mainMenu
        NSApp.servicesMenu = servicesMenu
    }

    func createMenu(parentMenu: NSMenu, configs: [Config]) {
        for config in configs {
            let item = createMenuItem(parentMenu: parentMenu, config: config)

            if config.type <= .menuServices {
                let menu = config.type == .menuServices ? servicesMenu : NSMenu(title: config.name)
                item.submenu = menu
                createMenu(parentMenu: menu, configs: config.configs)
            }

            if config.type > Type.item {
                dynamicMenuItems[config.type] = (dynamicMenuItems[config.type] ?? []) + [item]
            }
        }
    }

    func createMenuItem(parentMenu: NSMenu, config: Config) -> MenuItem {
        var item = MenuItem(title: config.name, action: config.action, keyEquivalent: config.key)
        item.config = config
        item.target = config.target
        item.keyEquivalentModifierMask = config.modifiers

        if config.type == .separator {
            item = MenuItem.separator() as? MenuItem ?? item
        }
        parentMenu.addItem(item)

        return item
    }

    @objc func about() {
        NSApp.orderFrontStandardAboutPanel(options: [
            .applicationName: "mpv",
            .applicationIcon: appIcon,
            .applicationVersion: String(cString: swift_mpv_version),
            .init(rawValue: "Copyright"): String(cString: swift_mpv_copyright),
        ])
    }

    @objc func settings(_ menuItem: MenuItem) {
        guard let menuConfig = menuItem.config else { return }
        let configPaths: [URL] = [
            URL(fileURLWithPath: NSHomeDirectory() + "/.config/mpv/", isDirectory: true),
            URL(fileURLWithPath: NSHomeDirectory() + "/.mpv/", isDirectory: true),
        ]

        for path in configPaths {
            let configFile = path.appendingPathComponent(menuConfig.url, isDirectory: false)

            if FileManager.default.fileExists(atPath: configFile.path) {
                if NSWorkspace.shared.open(configFile) {
                    return
                }
                NSWorkspace.shared.open(path)
                alert(title: "No Application found to open your config file.", text: "Please open the \(menuConfig.url) file with your preferred text editor in the now open folder to edit your config.")
                return
            }

            if NSWorkspace.shared.open(path) {
                alert(title: "No config file found.", text: "Please create a \(menuConfig.url) file with your preferred text editor in the now open folder.")
                return
            }
        }
    }

    @objc func openFiles() {
        let panel = NSOpenPanel()
        panel.allowsMultipleSelection = true
        panel.canChooseDirectories = true

        if panel.runModal() == .OK {
            appHub.input.open(files: panel.urls.map { $0.path })
        }
    }

    @objc func openPlaylist() {
        let panel = NSOpenPanel()

        if panel.runModal() == .OK, let url = panel.urls.first {
            appHub.input.command("loadlist \"\(url.path)\"")
        }
    }

    @objc func openUrl() {
        let alert = NSAlert()
        alert.messageText = "Open URL"
        alert.icon = appIcon
        alert.addButton(withTitle: "Ok")
        alert.addButton(withTitle: "Cancel")

        let input = NSTextField(frame: NSRect(x: 0, y: 0, width: 300, height: 24))
        input.placeholderString = "URL"
        alert.accessoryView = input

        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 0.1) {
            input.becomeFirstResponder()
        }

        if alert.runModal() == .alertFirstButtonReturn && input.stringValue.count > 0 {
            appHub.input.open(files: [input.stringValue])
        }
    }

    @objc func command(_ menuItem: MenuItem) {
        guard let menuConfig = menuItem.config else { return }
        appHub.input.command(menuConfig.command)
    }

    @objc func url(_ menuItem: MenuItem) {
        guard let menuConfig = menuItem.config,
              let url = URL(string: menuConfig.url) else { return }
        NSWorkspace.shared.open(url)
    }

    @objc func showFile(_ menuItem: MenuItem) {
        guard let menuConfig = menuItem.config else { return }
        let url = URL(fileURLWithPath: menuConfig.url)
        if FileManager.default.fileExists(atPath: url.path) {
            NSWorkspace.shared.activateFileViewerSelecting([url])
            return
        }

        alert(title: "No log File found.", text: "You deactivated logging for the Bundle.")
    }

    func alert(title: String, text: String) {
        let alert = NSAlert()
        alert.messageText = title
        alert.informativeText = text
        alert.icon = appIcon
        alert.addButton(withTitle: "Ok")
        alert.runModal()
    }

    func register(_ selector: Selector, key: Type) {
        for menuItem in dynamicMenuItems[key] ?? [] {
            menuItem.action = selector
        }
    }
}