import Cocoa
import SwiftUI

class AppDelegate: NSObject, NSApplicationDelegate {
    private var statusItem: NSStatusItem!
    private var volumeMonitor: VolumeMonitor!
    private var mediaKeyMonitor: MediaKeyMonitor!
    private var hudPanel: HUDPanel!
    private var prefsWindow: NSWindow?

    func applicationDidFinishLaunching(_ notification: Notification) {
        NSApp.setActivationPolicy(.accessory)

        setupStatusBar()
        setupHUD()
        setupVolumeMonitor()
        setupMediaKeyMonitor()
    }

    private func updateStatusIcon(volume: Float, isMuted: Bool) {
        guard let button = statusItem?.button else { return }
        let iconName: String
        if isMuted || volume == 0 {
            iconName = "speaker.slash.fill"
        } else if volume < 0.33 {
            iconName = "speaker.wave.1.fill"
        } else if volume < 0.66 {
            iconName = "speaker.wave.2.fill"
        } else {
            iconName = "speaker.wave.3.fill"
        }
        button.image = NSImage(systemSymbolName: iconName, accessibilityDescription: "HUDini")
        button.image?.size = NSSize(width: 18, height: 18)
    }

    private func setupStatusBar() {
        statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.squareLength)

        // Set initial icon based on current volume
        if let button = statusItem.button {
            button.image = NSImage(systemSymbolName: "speaker.wave.2.fill", accessibilityDescription: "HUDini")
            button.image?.size = NSSize(width: 18, height: 18)
        }

        let menu = NSMenu()

        let titleItem = NSMenuItem(title: "HUDini", action: nil, keyEquivalent: "")
        menu.addItem(titleItem)
        menu.addItem(NSMenuItem.separator())

        let hudItem = NSMenuItem(title: "Volume HUD", action: #selector(toggleHUD(_:)), keyEquivalent: "")
        hudItem.state = .on
        hudItem.target = self
        hudItem.tag = 100
        menu.addItem(hudItem)

        let mediaItem = NSMenuItem(title: "Play Key Launch", action: #selector(toggleMediaKeys(_:)), keyEquivalent: "")
        mediaItem.state = .on
        mediaItem.target = self
        mediaItem.tag = 200
        menu.addItem(mediaItem)

        menu.addItem(NSMenuItem.separator())

        let prefsItem = NSMenuItem(title: "Preferences...", action: #selector(openPreferences), keyEquivalent: ",")
        prefsItem.target = self
        menu.addItem(prefsItem)

        menu.addItem(NSMenuItem.separator())

        let quitItem = NSMenuItem(title: "Quit", action: #selector(quit), keyEquivalent: "q")
        quitItem.target = self
        menu.addItem(quitItem)

        statusItem.menu = menu
    }

    private func setupHUD() {
        hudPanel = HUDPanel()
    }

    private func setupVolumeMonitor() {
        volumeMonitor = VolumeMonitor { [weak self] volume, isMuted in
            DispatchQueue.main.async {
                self?.hudPanel.show(volume: volume, isMuted: isMuted)
                self?.updateStatusIcon(volume: volume, isMuted: isMuted)
            }
        }
        volumeMonitor.start()

        // Set initial icon from current volume
        let vol = volumeMonitor.getVolume()
        let muted = volumeMonitor.isMuted()
        updateStatusIcon(volume: vol, isMuted: muted)
    }

    private func setupMediaKeyMonitor() {
        mediaKeyMonitor = MediaKeyMonitor()
        let ok = mediaKeyMonitor.start()
        if !ok {
            DispatchQueue.main.asyncAfter(deadline: .now() + 3) { [weak self] in
                _ = self?.mediaKeyMonitor.start()
            }
        }
    }

    // MARK: - Actions

    @objc private func toggleHUD(_ sender: NSMenuItem) {
        if sender.state == .on {
            sender.state = .off
            volumeMonitor.stop()
        } else {
            sender.state = .on
            volumeMonitor.start()
        }
    }

    @objc private func toggleMediaKeys(_ sender: NSMenuItem) {
        if sender.state == .on {
            sender.state = .off
            mediaKeyMonitor.isEnabled = false
        } else {
            sender.state = .on
            mediaKeyMonitor.isEnabled = true
        }
    }

    @objc private func openPreferences() {
        if let window = prefsWindow {
            window.makeKeyAndOrderFront(nil)
            NSApp.activate(ignoringOtherApps: true)
            return
        }

        let prefsView = PreferencesView(
            currentBundleID: mediaKeyMonitor.preferredBundleID,
            startAtLogin: LoginItemManager.isEnabled,
            onSave: { [weak self] bundleID in
                self?.mediaKeyMonitor.preferredBundleID = bundleID
            },
            onStartAtLoginChanged: { enabled in
                // Use the .app bundle path from current process
                let appPath = Bundle.main.bundlePath
                // If running from .build, try to find the .app bundle
                let finalPath: String
                if appPath.contains(".build") {
                    let projectDir = (appPath as NSString)
                        .components(separatedBy: ".build").first ?? ""
                    let bundlePath = projectDir + "HUDini.app"
                    finalPath = FileManager.default.fileExists(atPath: bundlePath)
                        ? bundlePath : "/Applications/HUDini.app"
                } else {
                    finalPath = appPath
                }
                LoginItemManager.setEnabled(enabled, appPath: finalPath)
            }
        )

        let window = NSWindow(
            contentRect: NSRect(x: 0, y: 0, width: 320, height: 420),
            styleMask: [.titled, .closable],
            backing: .buffered,
            defer: false
        )
        window.title = "HUDini"
        window.contentView = NSHostingView(rootView: prefsView)
        window.center()
        window.isReleasedWhenClosed = false
        window.makeKeyAndOrderFront(nil)
        NSApp.activate(ignoringOtherApps: true)
        prefsWindow = window
    }

    @objc private func quit() {
        volumeMonitor.stop()
        mediaKeyMonitor.stop()
        NSApp.terminate(nil)
    }
}