import AppKit
import Combine

@MainActor
final class StatusItemController: NSObject, NSMenuDelegate {
    private let statusItem = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
    private let menu = NSMenu()
    private let stateItem = NSMenuItem()
    private let modelItem = NSMenuItem()
    private let engineItem = NSMenuItem()
    private let permissionItem = NSMenuItem()
    private let toggleItem = NSMenuItem()
    private let hintItem = NSMenuItem()
    private let cancelItem = NSMenuItem(title: "取消此次听写", action: nil, keyEquivalent: "")
    private var state: DictationController.State = .idle
    private var animation: Timer?
    private var frame = 0
    private var subscriptions = Set<AnyCancellable>()
    private let brandImage = Bundle.main.url(forResource: "AppIcon", withExtension: "icns")
        .flatMap { NSImage(contentsOf: $0) } ?? NSApp.applicationIconImage!

    var onToggle: (() -> Void)?
    var onCancel: (() -> Void)?
    var onSettings: (() -> Void)?

    override init() {
        super.init()
        menu.delegate = self
        menu.autoenablesItems = false
        for item in [stateItem, modelItem, engineItem, permissionItem] { item.isEnabled = false; menu.addItem(item) }
        menu.addItem(.separator())
        toggleItem.target = self
        toggleItem.action = #selector(toggleTapped)
        menu.addItem(toggleItem)
        cancelItem.target = self
        cancelItem.action = #selector(cancelTapped)
        menu.addItem(cancelItem)
        hintItem.isEnabled = false
        menu.addItem(hintItem)
        menu.addItem(.separator())
        for (title, code, action) in [
            ("设置与测试语音…", ",", #selector(settingsTapped)),
            ("下载 / 检查语音模型", "", #selector(downloadTapped)),
            ("复制上次识别结果", "", #selector(copyTapped)),
            ("退出 TinySTT", "q", #selector(quitTapped))
        ] {
            let item = NSMenuItem(title: title, action: action, keyEquivalent: code)
            item.target = self
            menu.addItem(item)
        }
        statusItem.menu = menu
        ModelManager.shared.$state.sink { [weak self] _ in
            DispatchQueue.main.async { self?.refresh() }
        }.store(in: &subscriptions)
        Prefs.shared.objectWillChange.sink { [weak self] _ in
            DispatchQueue.main.async { self?.refresh() }
        }.store(in: &subscriptions)
        NotificationCenter.default.publisher(for: .init("tinystt.engineStatus")).sink { [weak self] _ in
            self?.refresh()
        }.store(in: &subscriptions)
        update(state: .idle)
    }

    func menuWillOpen(_ menu: NSMenu) { refresh() }

    func update(state: DictationController.State) {
        self.state = state
        animation?.invalidate()
        animation = nil
        if state.isBusy {
            animation = Timer.scheduledTimer(withTimeInterval: 0.15, repeats: true) { [weak self] _ in
                MainActor.assumeIsolated {
                guard let self else { return }
                self.frame += 1
                self.drawIcon()
                }
            }
        }
        refresh()
    }

    private func refresh() {
        let prefs = Prefs.shared
        switch state {
        case .idle: stateItem.title = "TinySTT · 待机"
        case .starting: stateItem.title = "TinySTT · 正在准备…"
        case .recording: stateItem.title = "TinySTT · 正在聆听"
        case .finalizing: stateItem.title = "TinySTT · 正在整理文字…"
        }
        modelItem.title = "\(prefs.languageCode) · \(ModelManager.shared.statusText)"
        engineItem.title = SpeechEngine.statusDescription
        permissionItem.title = "麦克风\(Permissions.microphone == .granted ? " ✓" : " 未授权") · 辅助功能\(Permissions.accessibility ? " ✓" : " 未授权")"
        toggleItem.title = state == .recording ? "结束并写入" : "开始听写"
        toggleItem.isEnabled = state == .idle || state == .recording
        cancelItem.isEnabled = state.isBusy
        hintItem.title = "\(prefs.hotkey.label) · " + (prefs.triggerMode == .hold ? "按住说话 · Esc 取消" : "按键切换 · Esc 取消")
        drawIcon()
    }

    private func drawIcon() {
        guard let button = statusItem.button else { return }
        let icon = brandImage
        let state = self.state
        let frame = self.frame
        let image = NSImage(size: NSSize(width: 22, height: 18), flipped: false) { _ in
            icon.draw(in: NSRect(x: 0, y: 0, width: 18, height: 18))
            if state != .idle {
                let badge = NSRect(x: 15, y: 0, width: 7, height: 7)
                NSColor.windowBackgroundColor.setFill()
                NSBezierPath(ovalIn: badge).fill()
                if state == .recording {
                    NSColor.systemRed.setFill()
                    NSBezierPath(ovalIn: badge.insetBy(dx: 1, dy: 1)).fill()
                } else {
                    let arc = NSBezierPath()
                    let angle = CGFloat(frame * 30)
                    arc.appendArc(withCenter: NSPoint(x: badge.midX, y: badge.midY),
                                  radius: 2.5, startAngle: angle, endAngle: angle + 250)
                    arc.lineWidth = 1.5
                    arc.lineCapStyle = .round
                    NSColor.controlAccentColor.setStroke()
                    arc.stroke()
                }
            }
            return true
        }
        image.isTemplate = false
        button.image = image
        button.imagePosition = .imageLeading
        button.title = Prefs.shared.compactIcon ? "" : " TinySTT"
        button.contentTintColor = state == .recording ? .systemRed : nil
        button.alphaValue = state == .recording ? 0.65 + 0.35 * sin(Double(frame) * 0.5) : 1
        button.wantsLayer = true
        button.layer?.sublayerTransform = CATransform3DIdentity
        button.toolTip = "\(stateItem.title)\n\(modelItem.title)\n\(hintItem.title)"
        button.setAccessibilityLabel(button.toolTip)
    }

    @objc private func copyTapped() {
        let text = DictationController.shared.lastResult
        guard !text.isEmpty else { return }
        NSPasteboard.general.clearContents()
        NSPasteboard.general.setString(text, forType: .string)
    }
    @objc private func toggleTapped() { onToggle?() }
    @objc private func cancelTapped() { onCancel?() }
    @objc private func settingsTapped() { onSettings?() }
    @objc private func downloadTapped() { Task { await ModelManager.shared.refresh(); await ModelManager.shared.download() } }
    @objc private func quitTapped() { NSApp.terminate(nil) }
}