import AirAcceptCore
import AppKit
import Foundation

@MainActor
final class AppDelegate: NSObject, NSApplicationDelegate {
    private let configStore = ConfigStore()
    private let logger = AirAcceptLogger()
    private lazy var watcher = AirPlayPromptWatcher(configStore: configStore, logger: logger)
    private var statusItem: NSStatusItem?
    private let pollIntervalOptions = [2_000, 3_000, 4_000, 5_000]

    func applicationDidFinishLaunching(_ notification: Notification) {
        NSApp.setActivationPolicy(.accessory)
        logger.info("AirAccept launched pid=\(ProcessInfo.processInfo.processIdentifier)")
        ensureConfigExists()
        buildMenu()
        watcher.start()
    }

    func applicationWillTerminate(_ notification: Notification) {
        logger.info("AirAccept terminating pid=\(ProcessInfo.processInfo.processIdentifier)")
    }

    private func ensureConfigExists() {
        do {
            _ = try configStore.loadOrCreate()
        } catch {
            logger.error("failed to create or load config: \(error.localizedDescription)")
        }
    }

    private func buildMenu() {
        let item = NSStatusBar.system.statusItem(withLength: NSStatusItem.squareLength)
        if let image = NSImage(systemSymbolName: "airplayvideo", accessibilityDescription: "AirAccept") {
            image.isTemplate = true
            item.button?.image = image
        } else {
            item.button?.title = "AA"
        }
        item.button?.toolTip = "AirAccept"
        item.menu = makeMenu()
        statusItem = item
    }

    private func makeMenu() -> NSMenu {
        let menu = NSMenu()

        let statusItem = NSMenuItem(
            title: "Status: Running (PID \(ProcessInfo.processInfo.processIdentifier))",
            action: nil,
            keyEquivalent: ""
        )
        statusItem.isEnabled = false
        menu.addItem(statusItem)

        let permissionStateItem = NSMenuItem(
            title: AccessibilityReader.isTrusted(prompt: false)
                ? "Accessibility: Granted"
                : "Accessibility: Not Granted",
            action: nil,
            keyEquivalent: ""
        )
        permissionStateItem.isEnabled = false
        menu.addItem(permissionStateItem)

        menu.addItem(.separator())

        let watcherItem = NSMenuItem(
            title: watcher.isEnabled ? "Disable Watcher" : "Enable Watcher",
            action: #selector(toggleWatcher(_:)),
            keyEquivalent: ""
        )
        watcherItem.target = self
        menu.addItem(watcherItem)

        let intervalMenuItem = NSMenuItem(title: "Poll Interval", action: nil, keyEquivalent: "")
        intervalMenuItem.submenu = makePollIntervalMenu()
        menu.addItem(intervalMenuItem)

        let launchItem = NSMenuItem(
            title: "Launch at Login",
            action: #selector(toggleLaunchAtLogin(_:)),
            keyEquivalent: ""
        )
        launchItem.target = self
        launchItem.state = LoginItemManager.isEnabled ? .on : .off
        menu.addItem(launchItem)

        menu.addItem(.separator())

        let permissionItem = NSMenuItem(
            title: "Request Accessibility Permission",
            action: #selector(requestAccessibilityPermission(_:)),
            keyEquivalent: ""
        )
        permissionItem.target = self
        menu.addItem(permissionItem)

        let openConfigItem = NSMenuItem(
            title: "Open Config",
            action: #selector(openConfig(_:)),
            keyEquivalent: ""
        )
        openConfigItem.target = self
        menu.addItem(openConfigItem)

        let openLogsItem = NSMenuItem(
            title: "Open Logs",
            action: #selector(openLogs(_:)),
            keyEquivalent: ""
        )
        openLogsItem.target = self
        menu.addItem(openLogsItem)

        menu.addItem(.separator())

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

        return menu
    }

    private func makePollIntervalMenu() -> NSMenu {
        let menu = NSMenu()
        let currentInterval = currentConfig().pollIntervalMilliseconds

        for interval in pollIntervalOptions {
            let seconds = interval / 1_000
            let item = NSMenuItem(
                title: "\(seconds) seconds",
                action: #selector(setPollInterval(_:)),
                keyEquivalent: ""
            )
            item.target = self
            item.representedObject = interval
            item.state = currentInterval == interval ? .on : .off
            menu.addItem(item)
        }

        return menu
    }

    private func rebuildMenu() {
        statusItem?.menu = makeMenu()
    }

    private func currentConfig() -> AirAcceptConfig {
        (try? configStore.loadOrCreate()) ?? AirAcceptConfig()
    }

    @objc private func toggleWatcher(_ sender: NSMenuItem) {
        watcher.setEnabled(!watcher.isEnabled)
        rebuildMenu()
    }

    @objc private func setPollInterval(_ sender: NSMenuItem) {
        guard let interval = sender.representedObject as? Int else {
            return
        }

        do {
            try configStore.save(AirAcceptConfig(pollIntervalMilliseconds: interval))
            watcher.reloadConfiguration()
            logger.info("poll interval set to \(Double(interval) / 1_000.0)s")
        } catch {
            logger.error("failed to set poll interval: \(error.localizedDescription)")
        }
        rebuildMenu()
    }

    @objc private func toggleLaunchAtLogin(_ sender: NSMenuItem) {
        do {
            try LoginItemManager.setEnabled(!LoginItemManager.isEnabled)
            logger.info("launch at login set to \(LoginItemManager.isEnabled)")
        } catch {
            logger.error("failed to toggle launch at login: \(error.localizedDescription)")
        }
        rebuildMenu()
    }

    @objc private func requestAccessibilityPermission(_ sender: NSMenuItem) {
        _ = AccessibilityReader.isTrusted(prompt: true)
    }

    @objc private func openConfig(_ sender: NSMenuItem) {
        ensureConfigExists()
        NSWorkspace.shared.activateFileViewerSelecting([configStore.configURL])
    }

    @objc private func openLogs(_ sender: NSMenuItem) {
        NSWorkspace.shared.activateFileViewerSelecting([logger.logURL])
    }

    @objc private func quit(_ sender: NSMenuItem) {
        watcher.stop()
        NSApp.terminate(nil)
    }
}